Refactor params/config to separate files for clarity (#6427)

* split mainnet/onyx/altona/e2e configs into different files
* set onyx as the default network
* lint and fix comment
* more commentary
* gofmt
* Merge branch 'master' of github.com:prysmaticlabs/prysm into onyx-config
* gofmt

.bazelrc

@@ -0,0 +1,233 @@
+# Print warnings for tests with inappropriate test size or timeout.
+test --test_verbose_timeout_warnings
+
+# Only build test targets when running bazel test //...
+test --build_tests_only
+test --test_output=errors
+
+# Clearly indicate that coverage is enabled to disable certain nogo checks.
+coverage --define=coverage_enabled=1
+
+# Fix for rules_docker. See: https://github.com/bazelbuild/rules_docker/issues/842
+build --host_force_python=PY2
+test --host_force_python=PY2
+run --host_force_python=PY2
+
+# Networking is blocked for tests by default, add "requires-network" tag to your test if networking
+# is required within the sandbox. This flag is no longer experimental after 0.29.0.
+# Network sandboxing only works on linux.
+--experimental_sandbox_default_allow_network=false
+
+# Use mainnet protobufs at runtime
+run --define ssz=mainnet
+test --define ssz=mainnet
+build --define ssz=mainnet
+
+# Prevent PATH changes from rebuilding when switching from IDE to command line.
+build --incompatible_strict_action_env
+test --incompatible_strict_action_env
+run --incompatible_strict_action_env
+
+# Disable kafka by default, it takes a long time to build...
+build --define kafka_enabled=false
+test --define kafka_enabled=false
+run --define kafka_enabled=false
+
+build:kafka_enabled --define kafka_enabled=true
+build:kafka_enabled --define gotags=kafka_enabled
+
+# Release flags
+build:release --workspace_status_command=./scripts/workspace_status.sh
+build:release --stamp
+build:release --compilation_mode=opt
+build:release --config=llvm
+
+# LLVM compiler for building C/C++ dependencies.
+build:llvm --crosstool_top=@llvm_toolchain//:toolchain
+build:llvm --define compiler=llvm
+build:llvm --copt -fno-sanitize=vptr,function
+build:llvm --linkopt -fno-sanitize=vptr,function
+
+build:asan --copt -fsanitize=address,undefined
+build:asan --copt -fno-omit-frame-pointer
+build:asan --linkopt -fsanitize=address,undefined
+build:asan --copt -fno-sanitize=vptr,function
+build:asan --linkopt -fno-sanitize=vptr,function
+build:asan --copt -DADDRESS_SANITIZER=1
+build:asan --copt -D__SANITIZE_ADDRESS__
+build:asan --linkopt -ldl
+
+build:llvm-asan --config=llvm
+build:llvm-asan --config=asan
+build:llvm-asan --linkopt -fuse-ld=ld.lld
+
+build:fuzz --define=gotags=libfuzzer
+build:fuzz --config=llvm-asan
+build:fuzz --copt=-fsanitize=fuzzer-no-link
+build:fuzz --linkopt=-fsanitize=fuzzer
+build:fuzz --copt=-fno-omit-frame-pointer
+build:fuzz --define=FUZZING_ENGINE=libfuzzer
+build:fuzz --copt=-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+build:fuzz --linkopt -Wl,--no-as-needed
+build:fuzz --define=gc_goopts=-d=libfuzzer
+build:fuzz --run_under=//tools:fuzz_wrapper
+build:fuzz --compilation_mode=opt
+
+test:fuzz --local_test_jobs="HOST_CPUS*.5"
+
+test:fuzzit --config=fuzz
+test:fuzzit --test_env=FUZZIT_API_KEY
+test:fuzzit --test_env=PRYSM_BUILD_IMAGE=gcr.io/prysmaticlabs/prysm-fuzzit:v0.11.0
+test:fuzzit --test_timeout=1200
+test:fuzzit --run_under=//tools:fuzzit_wrapper
+
+# Build binary with cgo symbolizer for debugging / profiling.
+build:cgo_symbolizer --config=llvm
+build:cgo_symbolizer --copt=-g
+build:cgo_symbolizer --define=USE_CGO_SYMBOLIZER=true
+build:cgo_symbolizer -c dbg
+build:cgo_symbolizer --define=gotags=cgosymbolizer_enabled
+
+# multi-arch cross-compiling toolchain configs:
+-----------------------------------------------
+build:cross --crosstool_top=@prysm_toolchains//:multiarch_toolchain
+build:cross --host_platform=@io_bazel_rules_go//go/toolchain:linux_amd64
+build:cross --host_crosstool_top=@prysm_toolchains//:hostonly_toolchain
+
+# linux_amd64 config for cross compiler toolchain, not strictly necessary since host/exec env is amd64
+build:linux_amd64 --platforms=@io_bazel_rules_go//go/toolchain:linux_amd64_cgo
+
+# osx_amd64 config for cross compiler toolchain
+build:osx_amd64 --config=cross
+build:osx_amd64 --platforms=@io_bazel_rules_go//go/toolchain:darwin_amd64_cgo
+build:osx_amd64 --compiler=osxcross
+
+# windows
+build:windows_amd64 --config=cross
+build:windows_amd64  --platforms=@io_bazel_rules_go//go/toolchain:windows_amd64_cgo
+build:windows_amd64 --compiler=mingw-w64
+
+# linux_arm64 conifg for cross compiler toolchain
+build:linux_arm64 --config=cross
+build:linux_arm64 --platforms=@io_bazel_rules_go//go/toolchain:linux_arm64_cgo
+build:linux_arm64 --copt=-funsafe-math-optimizations
+build:linux_arm64 --copt=-ftree-vectorize
+build:linux_arm64 --copt=-fomit-frame-pointer
+build:linux_arm64 --cpu=aarch64
+build:linux_arm64 --compiler=clang
+build:linux_arm64 --copt=-march=armv8-a
+
+
+# toolchain build debug configs
+#------------------------------
+build:debug --sandbox_debug
+build:debug --toolchain_resolution_debug
+build:debug --verbose_failures
+build:debug -s
+
+# windows debug
+build:windows_amd64_debug --config=windows_amd64
+build:windows_amd64_debug --config=debug
+
+# osx_amd64 debug config
+build:osx_amd64_debug --config=debug
+build:osx_amd64_debug --config=osx_amd64
+
+# linux_arm64_debug
+build:linux_arm64_debug --config=linux_arm64
+build:linux_arm64_debug --config=debug
+
+# linux_amd64_debug
+build:linux_amd64_debug --config=linux_amd64
+build:linux_amd64_debug --config=debug
+
+
+# Docker Sandbox Configs
+#-----------------------
+# Note all docker sandbox configs must run from a linux x86_64 host
+# build:docker-sandbox --experimental_docker_image=gcr.io/prysmaticlabs/rbe-worker:latest
+build:docker-sandbox --spawn_strategy=docker --strategy=Javac=docker --genrule_strategy=docker
+build:docker-sandbox --define=EXECUTOR=remote
+build:docker-sandbox --experimental_docker_verbose
+build:docker-sandbox --experimental_enable_docker_sandbox
+build:docker-sandbox --crosstool_top=@rbe_ubuntu_clang//cc:toolchain 
+build:docker-sandbox --host_javabase=@rbe_ubuntu_clang//java:jdk 
+build:docker-sandbox --javabase=@rbe_ubuntu_clang//java:jdk 
+build:docker-sandbox --host_java_toolchain=@bazel_tools//tools/jdk:toolchain_hostjdk8 
+build:docker-sandbox --java_toolchain=@bazel_tools//tools/jdk:toolchain_hostjdk8 
+build:docker-sandbox --extra_execution_platforms=@rbe_ubuntu_clang//config:platform 
+build:docker-sandbox --host_platform=@rbe_ubuntu_clang//config:platform 
+build:docker-sandbox --platforms=@rbe_ubuntu_clang//config:platform
+build:docker-sandbox --extra_toolchains=@prysm_toolchains//:cc-toolchain-multiarch
+
+# windows_amd64 docker sandbox build config
+build:windows_amd64_docker --config=docker-sandbox --config=windows_amd64
+build:windows_amd64_docker_debug --config=windows_amd64_docker --config=debug
+
+# osx_amd64 docker sandbox build config
+build:osx_amd64_docker --config=docker-sandbox --config=osx_amd64
+build:osx_amd64_docker_debug --config=osx_amd64_docker --config=debug
+
+# linux_arm64 docker sandbox build config
+build:linux_arm64_docker --config=docker-sandbox --config=linux_arm64
+build:linux_arm64_docker_debug --config=linux_arm64_docker --config=debug
+
+# linux_amd64 docker sandbox build config
+build:linux_amd64_docker --config=docker-sandbox --config=linux_amd64
+build:linux_amd64_docker_debug --config=linux_amd64_docker --config=debug
+
+
+# Remote Build Execution
+#-----------------------
+# Originally from https://github.com/bazelbuild/bazel-toolchains/blob/master/bazelrc/bazel-2.0.0.bazelrc
+#
+# Depending on how many machines are in the remote execution instance, setting
+# this higher can make builds faster by allowing more jobs to run in parallel.
+# Setting it too high can result in jobs that timeout, however, while waiting
+# for a remote machine to execute them.
+build:remote --jobs=50
+
+# Set several flags related to specifying the platform, toolchain and java
+# properties.
+# These flags should only be used as is for the rbe-ubuntu16-04 container
+# and need to be adapted to work with other toolchain containers.
+build:remote --host_javabase=@rbe_ubuntu_clang//java:jdk
+build:remote --javabase=@rbe_ubuntu_clang//java:jdk
+build:remote --host_java_toolchain=@bazel_tools//tools/jdk:toolchain_hostjdk8
+build:remote --java_toolchain=@bazel_tools//tools/jdk:toolchain_hostjdk8
+build:remote --crosstool_top=@rbe_ubuntu_clang//cc:toolchain
+build:remote --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
+# Platform flags:
+# The toolchain container used for execution is defined in the target indicated
+# by "extra_execution_platforms", "host_platform" and "platforms".
+# More about platforms: https://docs.bazel.build/versions/master/platforms.html
+build:remote --extra_toolchains=@rbe_ubuntu_clang//config:cc-toolchain
+build:remote --extra_execution_platforms=@rbe_ubuntu_clang//config:platform
+build:remote --host_platform=@rbe_ubuntu_clang//config:platform
+build:remote --platforms=@rbe_ubuntu_clang//config:platform
+
+# Starting with Bazel 0.27.0 strategies do not need to be explicitly
+# defined. See https://github.com/bazelbuild/bazel/issues/7480
+build:remote --define=EXECUTOR=remote
+
+# Enable remote execution so actions are performed on the remote systems.
+# build:remote --remote_executor=grpcs://remotebuildexecution.googleapis.com
+
+# Enforce stricter environment rules, which eliminates some non-hermetic
+# behavior and therefore improves both the remote cache hit rate and the
+# correctness and repeatability of the build.
+build:remote --incompatible_strict_action_env=true
+
+# Set a higher timeout value, just in case.
+build:remote --remote_timeout=3600
+
+# Enable authentication. This will pick up application default credentials by
+# default. You can use --google_credentials=some_file.json to use a service
+# account credential instead.
+# build:remote --google_default_credentials=true
+
+# Enable build without the bytes
+# See: https://github.com/bazelbuild/bazel/issues/6862
+build:remote --experimental_remote_download_outputs=toplevel --experimental_inmemory_jdeps_files --experimental_inmemory_dotd_files
+
+build:remote --remote_local_fallback

.bazelversion

@@ -0,0 +1 @@
+3.2.0

.buildkite-bazelrc

@@ -2,8 +2,7 @@
 # across machines, developers, and workspaces.
 # 
 # This config is loaded from https://github.com/bazelbuild/bazel-toolchains/blob/master/bazelrc/latest.bazelrc
-build:remote-cache --remote_cache=remotebuildexecution.googleapis.com
-build:remote-cache --tls_enabled=true
+build:remote-cache --remote_cache=grpcs://remotebuildexecution.googleapis.com
 build:remote-cache --remote_timeout=3600
 build:remote-cache --auth_enabled=true
 build:remote-cache --spawn_strategy=standalone
@@ -11,12 +10,26 @@ build:remote-cache --strategy=Javac=standalone
 build:remote-cache --strategy=Closure=standalone
 build:remote-cache --strategy=Genrule=standalone
 
+# Build results backend.                                                        
+#build:remote-cache --bes_results_url="https://source.cloud.google.com/results/invocations/"
+#build:remote-cache --bes_backend=buildeventservice.googleapis.com               
+#build:remote-cache --bes_timeout=60s                                            
+#build:remote-cache --project_id=prysmaticlabs
+
 # Prysm specific remote-cache properties.
 build:remote-cache --disk_cache=
-build:remote-cache --jobs=50
 build:remote-cache --host_platform_remote_properties_override='properties:{name:\"cache-silo-key\" value:\"prysm\"}' 
 build:remote-cache --remote_instance_name=projects/prysmaticlabs/instances/default_instance
+build:remote-cache --remote_download_minimal
 
+# Import workspace options.
+import %workspace%/.bazelrc
+
+startup --host_jvm_args=-Xmx1000m --host_jvm_args=-Xms1000m
+query --repository_cache=/tmp/repositorycache
+query --experimental_repository_cache_hardlinks
+build --repository_cache=/tmp/repositorycache
+build --experimental_repository_cache_hardlinks
 build --experimental_strict_action_env
 build --disk_cache=/tmp/bazelbuilds
 build --experimental_multi_threaded_digest
@@ -24,10 +37,23 @@ build --sandbox_tmpfs_path=/tmp
 build --verbose_failures
 build --announce_rc
 build --show_progress_rate_limit=5
-build --curses=yes --color=yes
+build --curses=yes --color=no
 build --keep_going
 build --test_output=errors
 build --flaky_test_attempts=5
-build --test_timeout=5,60,-1,-1
 # Disabled race detection due to unstable test results under constrained environment build kite
 # build --features=race
+
+# Enable kafka for CI tests only.
+test --config=kafka_enabled
+
+build --bes_backend=grpcs://builds.prylabs.net:1985
+build --bes_results_url=https://builds.prylabs.net/invocation/
+
+# Disable flaky test detection for fuzzing.
+test:fuzz --flaky_test_attempts=1
+
+# Expose test environment variables in CI
+test:fuzzit --test_env=GITHUB_REF
+test:fuzzit --test_env=GITHUB_SHA
+test:fuzzit --test_env=DOCKER_HOST

.codecov.yml

@@ -27,3 +27,7 @@ comment:
   layout: "header, diff"
   behavior: default
   require_changes: no
+
+ignore:
+  - "**/*.pb.go"
+  - "**/*_mock.go"

.dockerignore

@@ -0,0 +1,2 @@
+bazel-*
+.git

.github/CODEOWNERS

@@ -0,0 +1,8 @@
+# Automatically require code review from core-team.
+* @prysmaticlabs/core-team
+
+# Starlark code owners
+*.bzl @prestonvanloon
+
+# Anyone on prylabs team can approve dependency updates.
+deps.bzl @prysmaticlabs/core-team

.github/FUNDING.yml

@@ -0,0 +1 @@
+custom: https://gitcoin.co/grants/24/prysm-by-prysmatic-labs

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,59 @@
+---
+name: "\U0001F41EBug report"
+about: Report a bug or problem with running Prysm
+---
+<!--💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎
+
+Hellooo! 😄 
+
+To help us tend to your issue faster, please search our currently open issues before submitting a new one.
+Existing issues often contain information about workarounds, resolution, or progress updates.
+
+💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎-->
+
+# 🐞 Bug Report
+
+### Description
+
+<!-- ✍️--> A clear and concise description of the problem...
+
+### Has this worked before in a previous version?
+
+<!-- Did this behavior use to work in the previous version? -->
+<!-- ✍️--> Yes, the previous version in which this bug was not present was: ....
+
+## 🔬 Minimal Reproduction
+
+<!--
+Please let us know how we can reproduce this issue. Include the exact method you used to run Prysm along with any flags used in your beacon chain and/or validator. Make sure you don't upload any confidential files or private keys.
+-->
+
+## 🔥 Error
+
+<pre><code>
+<!-- If the issue is accompanied by an error, please share the error logs with us below. If you have a lot of logs, place make a paste bin with your logs and share the link with us here: -->
+<!-- ✍️-->
+
+</code></pre>
+
+
+## 🌍  Your Environment
+
+**Operating System:**
+
+<pre>
+  <code>
+
+  </code>
+</pre>
+
+**What version of Prysm are you running? (Which release)**
+
+<pre>
+  <code>
+
+  </code>
+</pre>
+
+**Anything else relevant (validator index / public key)?**
+

.github/ISSUE_TEMPLATE/discussion.md

@@ -0,0 +1,21 @@
+---
+name: "\U0001F48EGeneral issue / discussion"
+about: Any other type of general issue or discussion
+
+---
+<!--💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎
+
+Hellooo! 😄 
+
+To help us tend to your issue faster, please search our currently open issues before submitting a new one.
+Existing issues often contain information about workarounds, resolution, or progress updates.
+
+💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎-->
+
+# 💎 Issue
+
+### Background
+
+<!-- ✍️--> Context and background information on the discussion...
+
+### Description

.github/ISSUE_TEMPLATE/feature_flag.md

@@ -0,0 +1,38 @@
+---
+name: "\U0001F984Feature Flag Tracking"
+about: Track a new feature, in development, in Prysm. This issue template should only be used by developers or contributors!
+labels: Tracking
+---
+<!--💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎
+
+Hellooo! 😄 
+
+Thanks for taking the time to file a tracking issue for your new feature. These issues really help
+us track progress of features as they work their way through development. Be sure to review 
+shared/featureconfig/README.md for the latest documentation around feature flags.
+
+💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎-->
+
+# 🦄 Feature Tracking
+
+**Current status** (opt-in or opt-out): 
+
+**Opt-in feature flag name**:
+
+**Opt-out feature flag name**: 
+
+### Feature Description
+
+<!-- ✍️--> A clear and concise description of the new feature. Provide links to your technical
+design document or other supporting information.
+
+### Tasks
+
+- [ ] Feature flag created as opt-in
+- [ ] Feature implemented / code complete
+- [ ] Feature tested in production for adequate amount of time
+- [ ] Feature flag is inverted to be opt-out and the opt-in flag is deprecated
+- [ ] Feature has made it to a tagged production release as an opt-out flag
+- [ ] Opt-out feature flag is deprecated and old code paths are cleaned up
+
+This issue should be closed after all of the above tasks are complete.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,27 @@
+---
+name: "\U0001F680Feature request"
+about: Suggest a feature for Prysm
+
+---
+<!--💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎
+
+Hellooo! 😄 
+
+To help us tend to your issue faster, please search our currently open issues before submitting a new one.
+Existing issues often contain information about workarounds, resolution, or progress updates.
+
+💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎-->
+
+# 🚀 Feature Request
+
+### Description
+
+<!-- ✍️--> A clear and concise description of the problem or missing capability...
+
+### Describe the solution you'd like
+
+<!-- ✍️--> If you have a solution in mind, please describe it.
+
+### Describe alternatives you've considered
+
+<!-- ✍️--> Have you considered any alternative solutions or workarounds?

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,30 @@
+<!-- Thanks for sending a PR! Before submitting:
+
+1. If this is your first PR, please read CONTRIBUTING.md and sign the CLA
+   first. We cannot review code without a signed CLA.
+2. Please file an issue *first*. All features and most bug fixes should have
+   an associated issue with a design discussed and decided upon. Small bug
+   fixes and documentation improvements don't need issues.
+3. New features and bug fixes must have tests. Documentation may need to
+   be updated. If you're unsure what to update, send the PR, and we'll discuss
+   in review.
+4. Note that PRs updating dependencies and new Go versions are not accepted.
+   Please file an issue instead.
+-->
+
+**What type of PR is this?**
+
+> Uncomment one line below and remove others.
+>
+> Bug fix
+> Feature
+> Documentation
+> Other
+
+**What does this PR do? Why is it needed?**
+
+**Which issues(s) does this PR fix?**
+
+Fixes #
+
+**Other notes for review**

.github/actions/gofmt/Dockerfile

@@ -0,0 +1,5 @@
+FROM cytopia/gofmt
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/gofmt/action.yml

@@ -0,0 +1,12 @@
+name: 'Gofmt checker'
+description: 'Checks that all project files have been properly formatted.'
+inputs:
+  path:
+    description: 'Path to check'
+    required: true
+    default: './'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.path }}

.github/actions/gofmt/entrypoint.sh

@@ -0,0 +1,15 @@
+#!/bin/sh -l
+set -e
+
+cd $GITHUB_WORKSPACE
+
+# Check if any files are not formatted.
+nonformatted="$(gofmt -l $1 2>&1)"
+
+# Return if `go fmt` passes.
+[ -z "$nonformatted" ] && exit 0
+
+# Notify of issues with formatting.
+echo "Following files need to be properly formatted:"
+echo "$nonformatted"
+exit 1

.github/actions/gomodtidy/Dockerfile

@@ -0,0 +1,5 @@
+FROM golang:alpine
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/gomodtidy/action.yml

@@ -0,0 +1,5 @@
+name: 'Go mod tidy checker'
+description: 'Checks that `go mod tidy` has been applied.'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

.github/actions/gomodtidy/entrypoint.sh

@@ -0,0 +1,34 @@
+#!/bin/sh -l
+set -e
+export PATH=$PATH:/usr/local/go/bin
+
+cd $GITHUB_WORKSPACE
+
+cp go.mod go.mod.orig
+cp go.sum go.sum.orig
+
+go mod tidy
+
+echo "Checking go.mod and go.sum:"
+checks=0
+if [ "$(diff -s go.mod.orig go.mod | grep -c 'Files go.mod.orig and go.mod are identical')" = 1 ]; then
+  echo "- go.mod is up to date."
+  checks=$((checks + 1))
+else
+  echo "- go.mod is NOT up to date."
+fi
+
+if [ "$(diff -s go.sum.orig go.sum | grep -c 'Files go.sum.orig and go.sum are identical')" = 1 ]; then
+  echo "- go.sum is up to date."
+  checks=$((checks + 1))
+else
+  echo "- go.sum is NOT up to date."
+fi
+
+if [ $checks -eq 2 ]; then
+  exit 0
+fi
+
+# Notify of any issues.
+echo "Run 'go mod tidy' to update."
+exit 1

.github/no-response.yml

@@ -0,0 +1,13 @@
+# Configuration for probot-no-response - https://github.com/probot/no-response
+
+# Number of days of inactivity before an Issue is closed for lack of response
+daysUntilClose: 14
+# Label requiring a response
+responseRequiredLabel: Need-Info
+# Comment to post when closing an Issue for lack of response. Set to `false` to disable
+closeComment: >
+  This issue has been automatically closed because there has been no response
+  to our request for more information from the original author. With only the
+  information that is currently in the issue, we don't have enough information
+  to take action. Please reach out if you have or find the answers we need so
+  that we can investigate further.

.github/workflows/dappnode-release-trigger.yml

@@ -0,0 +1,41 @@
+name: Update DAppNodePackages
+
+on:
+  push:
+    tags:
+    - '*'
+
+jobs:
+  dappnode-update-beacon-chain:
+    name: Trigger a beacon-chain release
+    runs-on: ubuntu-latest
+    steps:
+    - name: Get latest tag
+      id: get_tag
+      run: echo ::set-output name=TAG::${GITHUB_REF/refs\/tags\//}
+    - name: Send dispatch event to DAppNodePackage-prysm-beacon-chain
+      env: 
+        DISPATCH_REPO: dappnode/DAppNodePackage-prysm-beacon-chain
+      run: |
+        curl -v -X POST -u "${{ secrets.PAT_GITHUB }}" \
+        -H "Accept: application/vnd.github.everest-preview+json" \
+        -H "Content-Type: application/json" \
+        --data '{"event_type":"new_release", "client_payload": { "tag":"${{ steps.get_tag.outputs.TAG }}"}}' \
+        https://api.github.com/repos/$DISPATCH_REPO/dispatches
+        
+  dappnode-update-validator:
+    name: Trigger a validator release
+    runs-on: ubuntu-latest
+    steps:
+    - name: Get latest tag
+      id: get_tag
+      run: echo ::set-output name=TAG::${GITHUB_REF/refs\/tags\//}
+    - name: Send dispatch event to DAppNodePackage validator repository
+      env: 
+        DISPATCH_REPO: dappnode/DAppNodePackage-prysm-validator
+      run: |
+        curl -v -X POST -u "${{ secrets.PAT_GITHUB }}" \
+        -H "Accept: application/vnd.github.everest-preview+json" \
+        -H "Content-Type: application/json" \
+        --data '{"event_type":"new_release", "client_payload": { "tag":"${{ steps.get_tag.outputs.TAG }}"}}' \
+        https://api.github.com/repos/$DISPATCH_REPO/dispatches

.github/workflows/go.yml

@@ -0,0 +1,50 @@
+name: Go
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ '*' ]
+
+jobs:
+
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+
+      - name: Go mod tidy checker
+        id: gomodtidy
+        uses: ./.github/actions/gomodtidy
+
+      - name: Gofmt checker
+        id: gofmt
+        uses: ./.github/actions/gofmt
+        with:
+          path: ./
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Go 1.x
+        uses: actions/setup-go@v2
+        with:
+          go-version: ^1.14
+        id: go
+
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+
+      - name: Get dependencies
+        run: |
+          go get -v -t -d ./...
+
+      - name: Build
+        run: go build -v ./...
+
+# Tests run via Bazel for now...
+#      - name: Test
+#        run: go test -v ./...

.gitignore

@@ -4,6 +4,9 @@ bazel-*
 .DS_Store
 .swp
 
+# Ignore VI/Vim swapfiles
+.*.sw?
+
 # IntelliJ
 .idea
 .ijwb
@@ -14,6 +17,7 @@ bazel-*
 # Coverage outputs
 coverage.txt
 profile.out
+profile.grind
 
 # Nodejs
 node_modules
@@ -21,4 +25,7 @@ yarn-error.log
 .vscode/
 
 # Ignore password file
-password.txt 
+password.txt
+
+# Dist files
+dist

.soliumrc.json

@@ -1,18 +0,0 @@
-{
-  "extends": "solium:recommended",
-  "plugins": [
-    "security"
-  ],
-  "rules": {
-    "quotes": [
-      "error",
-      "double"
-    ],
-    "security/no-inline-assembly": ["warning"],
-
-    "indentation": [
-      "error",
-      4
-    ]
-  }
-}

.travis.yml

@@ -12,7 +12,7 @@ matrix:
         - go get ${gobuild_args} -t ./...
         - go get ${gobuild_args} github.com/golangci/golangci-lint/cmd/golangci-lint
       script:
-        - golangci-lint run
+        - golangci-lint run --skip-dirs ./proto
       email: false
       after_success:
         - wget https://raw.githubusercontent.com/k3rn31p4nic/travis-ci-discord-webhook/master/send.sh

.well-known/security.txt

@@ -0,0 +1,26 @@
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA512
+
+Contact: mailto:security@prysmaticlabs.com
+Encryption: openpgp4fpr:0AE0051D647BA3C1A917AF4072E33E4DF1A5036E
+Encryption: openpgp4fpr:341396BAFACC28C5082327F889725027FC8EC0D4
+Encryption: openpgp4fpr:FEE44615A19049DF0CA0C2735E2B7E5734DFADCB
+Preferred-Languages: en
+Canonical: https://github.com/prysmaticlabs/prysm/tree/master/.well-known/security.txt
+
+-----BEGIN PGP SIGNATURE-----
+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+=5qpD
+-----END PGP SIGNATURE-----

BUILD.bazel

@@ -3,12 +3,18 @@ load("@com_github_atlassian_bazel_tools//gometalinter:def.bzl", "gometalinter")
 load("@com_github_atlassian_bazel_tools//goimports:def.bzl", "goimports")
 load("@io_kubernetes_build//defs:run_in_workspace.bzl", "workspace_binary")
 load("@io_bazel_rules_go//go:def.bzl", "nogo")
+load("@graknlabs_bazel_distribution//common:rules.bzl", "assemble_targz", "assemble_versioned")
+load("@bazel_skylib//rules:common_settings.bzl", "string_setting")
 
 prefix = "github.com/prysmaticlabs/prysm"
 
-exports_files(["genesis.json"])
+exports_files([
+    "LICENSE.md",
+])
 
 # gazelle:prefix github.com/prysmaticlabs/prysm
+# gazelle:map_kind go_library go_library @prysm//tools/go:def.bzl
+# gazelle:map_kind go_repository go_repository @prysm//tools/go:def.bzl
 gazelle(
     name = "gazelle",
     prefix = prefix,
@@ -27,9 +33,21 @@ alias(
 alias(
     name = "grpc_proto_compiler",
     actual = "@io_bazel_rules_go//proto:gogofast_grpc",
-    visibility = [
-        "//proto:__subpackages__",
-    ],
+    visibility = ["//visibility:public"],
+)
+
+# Protobuf gRPC compiler without gogoproto. Required for gRPC gateway.
+alias(
+    name = "grpc_nogogo_proto_compiler",
+    actual = "@io_bazel_rules_go//proto:go_grpc",
+    visibility = ["//visibility:public"],
+)
+
+# Protobuf gRPC gateway compiler
+alias(
+    name = "grpc_gateway_proto_compiler",
+    actual = "@com_github_grpc_ecosystem_grpc_gateway//protoc-gen-grpc-gateway:go_gen_grpc_gateway",
+    visibility = ["//visibility:public"],
 )
 
 gometalinter(
@@ -44,8 +62,8 @@ gometalinter(
 goimports(
     name = "goimports",
     display_diffs = True,
-    write = False,
     prefix = prefix,
+    write = False,
 )
 
 workspace_binary(
@@ -55,6 +73,8 @@ workspace_binary(
 
 nogo(
     name = "nogo",
+    config = "nogo_config.json",
+    visibility = ["//visibility:public"],
     deps = [
         "@org_golang_x_tools//go/analysis/passes/unsafeptr:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/unreachable:go_tool_library",
@@ -68,14 +88,12 @@ nogo(
         "@org_golang_x_tools//go/analysis/passes/pkgfact:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/nilness:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/nilfunc:go_tool_library",
-        # "@org_golang_x_tools//go/analysis/passes/lostcancel:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/loopclosure:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/httpresponse:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/findcall:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/deepequalerrors:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/ctrlflow:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/copylock:go_tool_library",
-        "@org_golang_x_tools//go/analysis/passes/composite:go_tool_library",
         #  "@org_golang_x_tools//go/analysis/passes/cgocall:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/buildtag:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/buildssa:go_tool_library",
@@ -85,7 +103,42 @@ nogo(
         "@org_golang_x_tools//go/analysis/passes/assign:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/inspect:go_tool_library",
         "@org_golang_x_tools//go/analysis/passes/asmdecl:go_tool_library",
-    ],
-    visibility = ["//visibility:public"],
-    config = "nogo_config.json",
+        "//tools/analyzers/maligned:go_tool_library",
+        "//tools/analyzers/roughtime:go_tool_library",
+        "//tools/analyzers/cryptorand:go_tool_library",
+        "//tools/analyzers/errcheck:go_tool_library",
+        "//tools/analyzers/featureconfig:go_tool_library",
+    ] + select({
+        # nogo checks that fail with coverage enabled.
+        ":coverage_enabled": [],
+        "//conditions:default": [
+            "@org_golang_x_tools//go/analysis/passes/lostcancel:go_tool_library",
+            "@org_golang_x_tools//go/analysis/passes/composite:go_tool_library",
+        ],
+    }),
+)
+
+config_setting(
+    name = "coverage_enabled",
+    values = {"define": "coverage_enabled=1"},
+)
+
+common_files = {
+    "//:LICENSE.md": "LICENSE.md",
+    "//:README.md": "README.md",
+}
+
+toolchain(
+    name = "built_cmake_toolchain",
+    toolchain = "@rules_foreign_cc//tools/build_defs/native_tools:built_cmake",
+    toolchain_type = "@rules_foreign_cc//tools/build_defs:cmake_toolchain",
+)
+
+string_setting(
+    name = "gotags",
+    build_setting_default = "",
+    values = [
+        "",
+        "libfuzzer",
+    ],
 )

CONTRIBUTING.md

@@ -1,6 +1,8 @@
 # Contribution Guidelines
 
-Excited by our work and want to get involved in building out our sharding releases? Or maybe you haven't learned as much about the Ethereum protocol but are a savvy developer? Our [READINGS.md](https://github.com/prysmaticlabs/prysm/blob/master/docs/READINGS.md) doc includes comprehensive information on Ethereum and sharding for both part-time and core contributors to the project.
+Note: The latest and most up to date documenation can be found on our [docs portal](https://docs.prylabs.network/docs/contribute/contribution-guidelines).
+
+Excited by our work and want to get involved in building out our sharding releases? Or maybe you haven't learned as much about the Ethereum protocol but are a savvy developer? 
 
 You can explore our [Open Issues](https://github.com/prysmaticlabs/prysm/issues) in-the works for our different releases. Feel free to fork our repo and start creating PR’s after assigning yourself to an issue of interest. We are always chatting on [Discord](https://discord.gg/che9auJ) or [Gitter](https://gitter.im/prysmaticlabs/geth-sharding) drop us a line there if you want to get more involved or have any questions on our implementation!
 
@@ -63,7 +65,7 @@ $ go test <file_you_are_working_on>
 Changes that affect multiple files can be tested with ...
 
 ```
-$ gometalinter && bazel test
+$ golangci-lint run && bazel test //...
 ```
 
 **10. Stage the file or files that you want to commit.**
@@ -88,10 +90,10 @@ You can use the –amend flag to include previous commits that have not yet been
 $ git fetch prysm
 ```
 
-**13. Rebase your branch atop of the latest version of Prysm.**
+**13. Pull latest version of Prysm.**
 
 ```
-$ git rebase prysm/master
+$ git pull origin master
 ```
 
 If there are conflicts between your edits and those made by others since you started work Git will ask you to resolve them. To find out which files have conflicts run ...
@@ -115,10 +117,10 @@ The code from the Prysm repo is inserted between <<< and === while the change yo
 
 **14. Push your changes to your fork of the Prysm repo.**
 
-Rebasing a pull request changes the history on your branch, so Git will reject a normal git push after a rebase. Use a force push to move your changes to your fork of the repo.
+Use git push to move your changes to your fork of the repo.
 
 ```
-$ git push myrepo feature-in-progress-branch -f
+$ git push myrepo feature-in-progress-branch
 ```
 
 **15. Check to be sure your fork of the Prysm repo contains your feature branch with the latest edits.**

DEPENDENCIES.md

@@ -0,0 +1,69 @@
+# Dependency Managagement in Prysm
+
+Prysm is go project with many complicated dependencies, including some c++ based libraries. There
+are two parts to Prysm's dependency management. Go modules and bazel managed dependencies. Be sure 
+to read [Why Bazel?](https://github.com/prysmaticlabs/documentation/issues/138) to fully
+understand the reasoning behind an additional layer of build tooling via Bazel rather than a pure
+"go build" project.
+
+## Go Module support
+
+The Prysm project officially supports go modules with some caveats. 
+
+### Caveat 1: Some c++ libraries are precompiled archives
+
+Given some of Prysm's c++ dependencies have very complicated project structures which make building
+difficult or impossible with "go build" alone. Additionally, building c++ dependencies with certain
+compilers, like clang / LLVM, offer a significant performance improvement. To get around this 
+issue, c++ dependencies have been precompiled as linkable archives. While there isn't necessarily
+anything bad about precompiled archives, these files are a "blackbox" which a 3rd party author
+could have compiled anything for this archive and detecting undesired behavior would be nearly
+impossible. If your risk tolerance is low, always compile everything from source yourself, 
+including complicated c++ dependencies.
+
+*Recommendation: Use go build only for local development and use bazel build for production.*
+
+### Caveat 2: Generated gRPC protobuf libraries
+
+One key advantage of Bazel over vanilla `go build` is that Bazel automatically (re)builds generated
+pb.go files at build time when file changes are present in any protobuf definition file or after
+any updates to the protobuf compiler or other relevant dependencies. Vanilla go users should run
+the following scripts often to ensure their generated files are up to date. Further more, Prysm
+generates SSZ marshal related code based on defined data structures. These generated files must
+also be updated and checked in as frequently.
+
+```bash
+./scripts/update-go-pbs.sh
+./scripts/update-go-ssz.sh
+```
+
+*Recommendation: Use go build only for local development and use bazel build for production.*
+
+### Caveat 3: Compile-time optimizations 
+
+When Prysmatic Labs builds production binaries, they use the "release" configuration of bazel to
+compile with several compiler optimizations and recommended production build configurations.
+Additionally, the release build properly stamps the built binaries to include helpful metadata
+about how and when the binary was built. 
+
+*Recommendation: Use go build only for local development and use bazel build for production.*
+
+```bash
+bazel build //beacon-chain --config=release
+```
+ 
+## Adding / updating dependencies
+
+1. Add your dependency as you would with go modules. I.e. `go get ...`
+1. Run `gazelle update-repos -from_file=go.mod` to update the bazel managed dependencies.
+
+Example:
+
+```bash
+go get github.com/prysmaticlabs/example@v1.2.3
+bazel run //:gazelle -- update-repos -from_file=go.mod -to_macro=deps.bzl%prysm_deps
+```
+
+The deps.bzl file should have been updated with the dependency and any transitive dependencies. 
+
+Do NOT add new `go_repository` to the WORKSPACE file. All dependencies should live in deps.bzl.

INTEROP.md

@@ -0,0 +1,84 @@
+# Prysm Client Interoperability Guide
+
+This README details how to setup Prysm for interop testing for usage with other Ethereum 2.0 clients.
+
+## Installation & Setup
+
+1. Install [Bazel](https://docs.bazel.build/versions/master/install.html) **(Recommended)**
+2. `git clone https://github.com/prysmaticlabs/prysm && cd prysm`
+3. `bazel build //...`
+
+## Starting from Genesis
+
+Prysm supports a few ways to quickly launch a beacon node from basic configurations:
+
+- `NumValidators + GenesisTime`: Launches a beacon node by deterministically generating a state from a num-validators flag along with a genesis time **(Recommended)**
+- `SSZ Genesis`: Launches a beacon node  from a .ssz file containing a SSZ-encoded, genesis beacon state
+
+## Generating a Genesis State
+
+To setup the necessary files for these quick starts, Prysm provides a tool to generate a `genesis.ssz` from
+a deterministically generated set of validator private keys following the official interop YAML format 
+[here](https://github.com/ethereum/eth2.0-pm/blob/master/interop/mocked_start).
+
+You can use `bazel run //tools/genesis-state-gen` to create a deterministic genesis state for interop.
+
+### Usage
+
+- **--genesis-time** uint: Unix timestamp used as the genesis time in the generated genesis state (defaults to now)
+- **--mainnet-config** bool: Select whether genesis state should be generated with mainnet or minimal (default) params
+- **--num-validators** int: Number of validators to deterministically include in the generated genesis state
+- **--output-ssz** string: Output filename of the SSZ marshaling of the generated genesis state
+
+The example below creates 64 validator keys, instantiates a genesis state with those 64 validators and with genesis unix timestamp 1567542540,
+and finally writes a ssz encoded output to ~/Desktop/genesis.ssz. This file can be used to kickstart the beacon chain in the next section.
+
+```
+bazel run //tools/genesis-state-gen -- --output-ssz ~/Desktop/genesis.ssz --num-validators 64 --genesis-time 1567542540
+```
+
+## Launching a Beacon Node + Validator Client
+
+### Launching from Pure CLI Flags
+
+Open up two terminal windows, run:
+
+```
+bazel run //beacon-chain -- \
+--bootstrap-node= \
+--deposit-contract $(curl -s https://prylabs.net/contract) \
+--force-clear-db \
+--interop-num-validators 64 \
+--interop-eth1data-votes
+```
+
+This will deterministically generate a beacon genesis state and start
+the system with 64 validators and the genesis time set to the current unix timestamp.
+Wait a bit until your beacon chain starts, and in the other window:
+
+```
+bazel run //validator -- --keymanager=interop --keymanageropts='{"keys":64}'
+```
+
+This will launch and kickstart the system with your 64 validators performing their duties accordingly.
+
+### Launching from `genesis.ssz`
+
+Assuming you generated a `genesis.ssz` file with 64 validators, open up two terminal windows, run:
+
+```
+ bazel run //beacon-chain -- \
+--bootstrap-node= \
+--deposit-contract $(curl -s https://prylabs.net/contract) \
+--force-clear-db \
+--interop-genesis-state /path/to/genesis.ssz \
+--interop-eth1data-votes
+```
+
+Wait a bit until your beacon chain starts, and in the other window:
+
+```
+bazel run //validator -- --keymanager=interop --keymanageropts='{"keys":64}'
+```
+
+This will launch and kickstart the system with your 64 validators performing their duties accordingly.

PULL_REQUEST_TEMPLATE.md

@@ -1,13 +0,0 @@
-TODO(you): choose "part of" or "resolves" and the associated github issue #.
-
-[Part of|Resolves] #531 
-
----
-
-# Description
-
-**Write why you are making the changes in this pull request**
-
-**Write a summary of the changes you are making**
-
-**Link anything that would be helpful or relevant to the reviewers**

README.md

@@ -1,122 +1,21 @@
-# Prysmatic Labs Ethereum Serenity Implementation
-
-[![Build status](https://badge.buildkite.com/b555891daf3614bae4284dcf365b2340cefc0089839526f096.svg)](https://buildkite.com/prysmatic-labs/prysm)
-
-This is the main repository for the Go implementation of the Ethereum 2.0 Serenity [Prysmatic Labs](https://prysmaticlabs.com).
-
-Before you begin, check out our [official documentation portal](https://prysmaticlabs.gitbook.io/prysm/) and join our active chat room on Discord or Gitter below:
+# Prysm: An Ethereum 2.0 Client Written in Go
 
+[![Build status](https://badge.buildkite.com/b555891daf3614bae4284dcf365b2340cefc0089839526f096.svg?branch=master)](https://buildkite.com/prysmatic-labs/prysm)
+[![fuzzit](https://app.fuzzit.dev/badge?org_id=prysmaticlabs-gh)](https://app.fuzzit.dev/orgs/prysmaticlabs-gh/dashboard)
+[![ETH2.0_Spec_Version 0.12.1](https://img.shields.io/badge/ETH2.0%20Spec%20Version-v0.12.1-blue.svg)](https://github.com/ethereum/eth2.0-specs/tree/v0.12.1)
 [![Discord](https://user-images.githubusercontent.com/7288322/34471967-1df7808a-efbb-11e7-9088-ed0b04151291.png)](https://discord.gg/KSA7rPr)
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/prysmaticlabs/geth-sharding?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 
-Also, read our [Roadmap Reference Implementation Doc](https://github.com/prysmaticlabs/prysm/blob/master/docs/ROADMAP.md). This doc provides a background on the milestones we aim for the project to achieve.
+This is the core repository for Prysm, a [Golang](https://golang.org/) implementation of the Ethereum 2.0 client specifications developed by [Prysmatic Labs](https://prysmaticlabs.com).
 
+### Getting Started
+A detailed set of installation and usage instructions as well as breakdowns of each individual component are available in the [official documentation portal](https://docs.prylabs.network). If you still have questions, feel free to stop by either our [Discord](https://discord.gg/KSA7rPr) or [Gitter](https://gitter.im/prysmaticlabs/geth-sharding?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) and a member of the team or our community will be happy to assist you.
 
-# Table of Contents
+### Come join the testnet!
+Participation is now open to the public for our Ethereum 2.0 phase 0 testnet release. Visit [prylabs.net](https://prylabs.net) for more information on the project or to sign up as a validator on the network. You can visualize the nodes in the network on [eth2stats.io](https://eth2stats.io), explore validator rewards/penalties via Bitfly's block explorer: [beaconcha.in](https://beaconcha.in), and follow the latest blocks added to the chain on [Etherscan](https://beacon.etherscan.io).
 
-- [Join Our Testnet](#join-our-testnet)
-- [Installation](#installation)
-    - [Run Via Docker](#run-via-docker-recommended)
-    - [Run Via Bazel](#run-via-bazel)
-  - [Prysm Main Components](#prysm-main-components)
-    - [Running an Ethereum 2.0 Beacon Node](#running-an-ethereum-20-beacon-node)
-    - [Staking ETH: Running a Validator Client](#staking-eth-running-a-validator-client)
--   [Testing](#testing)
--   [Contributing](#contributing)
--   [License](#license)
-
-# Join Our Testnet
-
-You can now participate in our public testnet release for Ethereum 2.0 phase 0. Visit [prylabs.net](https://prylabs.net) 💎 to participate!
-
-# Installing Prysm
-
-### Installation Options
-You can either choose to run our system via:
-- Our latest [release](https://github.com/prysmaticlabs/prysm/releases) **(Easiest)**
-- Using Docker **(Recommended)**
-- Using Our Build Tool, Bazel
-
-### Fetching via Docker (Recommended)
-Docker is a convenient way to run Prysm, as all you need to do is fetch the latest images:
-
-```
-docker pull gcr.io/prysmaticlabs/prysm/validator:latest
-docker pull gcr.io/prysmaticlabs/prysm/beacon-chain:latest
-```
-
-### Build Via Bazel
-First, clone our repository:
-
-```
-git clone https://github.com/prysmaticlabs/prysm
-```
-
-Download the Bazel build tool by Google here and ensure it works by typing:
-
-```
-bazel version
-```
-
-Bazel manages all of the dependencies for you (including go and necessary compilers) so you are all set to build prysm. Then, build both parts of our system: a beacon chain node implementation, and a validator client:
-
-```
-bazel build //beacon-chain:beacon-chain
-bazel build //validator:validator
-```
-
-# Prysm Main Components
-Prysm ships with two important components: a beacon node and a validator client. The beacon node is the server that performs the heavy lifting of Ethereum 2.0., A validator client is another piece of software that securely connects to the beacon node and allows you to stake 3.2 Goerli ETH in order to secure the network. You'll be mostly interacting with the validator client to manage your stake.
-Another critical component of Ethereum 2.0 is the Validator Deposit Contract, which is a smart contract deployed on the Ethereum 1.0 chain which can be used for current holders of ETH to do a one-way transfer into Ethereum 2.0.
-
-### Running an Ethereum 2.0 Beacon Node
-With docker:
-
-```
-docker run -v /tmp/prysm-data:/data -p 4000:4000 \
-  gcr.io/prysmaticlabs/prysm/beacon-chain:latest \
-  --datadir=/data
-  --clear-db
-```
-
-To start your beacon node with bazel:
-
-```
-bazel run //beacon-chain -- --clear-db --datadir=/tmp/prysm-data
-```
-
-This will sync you up with the latest head block in the network, and then you'll have a ready beacon node.
-The chain will then be waiting for you to deposit 3.2 Goerli ETH into the Validator Deposit Contract before your validator can become active! Now, you'll need to create a validator client to connect to this node and stake 3.2 Goerli ETH to participate as a validator in Ethereum 2.0's Proof of Stake system.
-
-### Staking ETH: Running a Validator Client
-Once your beacon node is up, you'll need to attach a validator client as a separate process. Each validator represents 3.2 Goerli ETH being staked in the system, so you can spin up as many as you want to have more at stake in the network
-
-**Activating Your Validator: Depositing 3.2 Goerli ETH**
-
-Using your validator deposit data from the previous step, use the instructions in https://alpha.prylabs.net/participate to deposit.
-
-It'll take a while for the nodes in the network to process your deposit, but once you're active, your validator will begin doing its responsibility! In your validator client, you'll be able to frequently see your validator balance as it goes up. If you ever go offline for a while, you'll start gradually losing your deposit until you get kicked out of the system. Congratulations, you are now running Ethereum 2.0 Phase 0 :).
-
-# Testing
-
-To run the unit tests of our system do:
-
-```
-bazel test //...
-```
-
-To run our linter, make sure you have [golangci-lint](https://https://github.com/golangci/golangci-lint) installed and then run:
-
-```
-golangci-lint run
-```
-
-# Contributing
-
-We have put all of our contribution guidelines into [CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/master/CONTRIBUTING.md)! Check it out to get started.
-
-![nyancat](https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRBSus2ozk_HuGdHMHKWjb1W5CmwwoxmYIjIBmERE1u-WeONpJJXg)
-
-# License
+## Contributing
+Want to get involved? Check out our [Contribution Guide](https://docs.prylabs.network/docs/contribute/contribution-guidelines/) to learn more!
 
+## License
 [GNU General Public License v3.0](https://www.gnu.org/licenses/gpl-3.0.en.html)

TESTNET.md

@@ -0,0 +1,43 @@
+# Testnet 
+
+The Prysmatic Labs test network is available for anyone to join. The easiest way to participate is by joining through the website, https://prylabs.net.
+
+## Interop
+
+For developers looking to connect a client other than Prysm to the test network, here is the relevant information for compatability. 
+
+
+**Spec version** - [v0.8.3](https://github.com/ethereum/eth2.0-specs/tree/v0.8.3)
+
+**ETH 1 Deposit Contract Address** - See https://prylabs.net/contract. This contract is deployed on the [goerli](https://goerli.net/) network. 
+
+**Genesis time** - The ETH1 block time in which the 64th deposit to start ETH2 was included. This is NOT midnight of the next day as required by spec.
+
+### ETH 2 Configuration
+
+Use the [minimal config](https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/configs/minimal.yaml) with the following changes.
+
+| field | value |
+|-------|-------|
+| MIN_DEPOSIT_AMOUNT | 100 |
+| MAX_EFFECTIVE_BALANCE | 3.2 * 1e9 |
+| EJECTION_BALANCE | 1.6 * 1e9 |
+| EFFECTIVE_BALANCE_INCREMENT | 0.1 * 1e9 |
+| ETH1_FOLLOW_DISTANCE | 16 | 
+| GENESIS_FORK_VERSION | See [latest code](https://github.com/prysmaticlabs/prysm/blob/master/shared/params/config.go#L236) |
+
+These parameters reduce the minimal config to 1/10 of the required ETH.
+
+We have a genesis.ssz file available for download [here](https://prysmaticlabs.com/uploads/genesis.ssz)
+
+### Connecting to the network
+
+We have a libp2p bootstrap node available at `/dns4/prylabs.net/tcp/30001/p2p/16Uiu2HAm7Qwe19vz9WzD2Mxn7fXd1vgHHp4iccuyq7TxwRXoAGfc`.
+
+Some of the Prysmatic Labs hosted nodes are behind a libp2p relay, so your libp2p implementation protocol should understand this functionality.
+
+### Other
+
+Undoubtably, you will have bugs. Reach out to us on [Discord](https://discord.gg/KSA7rPr) and be sure to capture issues on Github at https://github.com/prysmaticlabs/prysm/issues. 
+
+If you have instructions for you client, we would love to attempt this on your behalf. Kindly send over the instructions via github issue, PR, email to team@prysmaticlabs.com, or discord.

VERSION

@@ -0,0 +1 @@
+0.2.0

bazel.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# This script serves as a wrapper around bazel to limit the scope of environment variables that
+# may change the action output. Using this script should result in a higher cache hit ratio for
+# cached actions with a more heremtic build.
+
+env -i \
+ PATH=/usr/bin:/bin \
+ HOME=$HOME \
+ GOOGLE_APPLICATION_CREDENTIALS=$GOOGLE_APPLICATION_CREDENTIALS \
+ bazel "$@"

beacon-chain/BUILD.bazel

@@ -1,6 +1,9 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
+load("@prysm//tools/go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_test")
 load("@io_bazel_rules_docker//go:image.bzl", "go_image")
-load("@io_bazel_rules_docker//container:container.bzl", "container_push")
+load("@io_bazel_rules_docker//container:container.bzl", "container_bundle")
+load("//tools:go_image.bzl", "go_image_alpine", "go_image_debug")
+load("@io_bazel_rules_docker//contrib:push-all.bzl", "docker_push")
 
 go_library(
     name = "go_default_library",
@@ -11,15 +14,21 @@ go_library(
     importpath = "github.com/prysmaticlabs/prysm/beacon-chain",
     visibility = ["//beacon-chain:__subpackages__"],
     deps = [
+        "//beacon-chain/flags:go_default_library",
         "//beacon-chain/node:go_default_library",
-        "//beacon-chain/utils:go_default_library",
         "//shared/cmd:go_default_library",
         "//shared/debug:go_default_library",
         "//shared/featureconfig:go_default_library",
+        "//shared/logutil:go_default_library",
         "//shared/version:go_default_library",
+        "@com_github_ethereum_go_ethereum//log:go_default_library",
+        "@com_github_ipfs_go_log_v2//:go_default_library",
+        "@com_github_joonix_log//:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
-        "@com_github_urfave_cli//:go_default_library",
+        "@com_github_urfave_cli_v2//:go_default_library",
+        "@com_github_urfave_cli_v2//altsrc:go_default_library",
         "@com_github_x_cray_logrus_prefixed_formatter//:go_default_library",
+        "@org_uber_go_automaxprocs//:go_default_library",
     ],
 )
 
@@ -29,6 +38,11 @@ go_image(
         "main.go",
         "usage.go",
     ],
+    base = select({
+        "//tools:base_image_alpine": "//tools:alpine_cc_image",
+        "//tools:base_image_cc": "//tools:cc_image",
+        "//conditions:default": "//tools:cc_image",
+    }),
     goarch = "amd64",
     goos = "linux",
     importpath = "github.com/prysmaticlabs/prysm/beacon-chain",
@@ -37,31 +51,103 @@ go_image(
     tags = ["manual"],
     visibility = ["//visibility:private"],
     deps = [
+        "//beacon-chain/flags:go_default_library",
         "//beacon-chain/node:go_default_library",
-        "//beacon-chain/utils:go_default_library",
         "//shared/cmd:go_default_library",
         "//shared/debug:go_default_library",
         "//shared/featureconfig:go_default_library",
+        "//shared/logutil:go_default_library",
         "//shared/version:go_default_library",
+        "@com_github_ethereum_go_ethereum//log:go_default_library",
+        "@com_github_ipfs_go_log_v2//:go_default_library",
+        "@com_github_joonix_log//:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
-        "@com_github_urfave_cli//:go_default_library",
+        "@com_github_urfave_cli_v2//:go_default_library",
+        "@com_github_urfave_cli_v2//altsrc:go_default_library",
         "@com_github_x_cray_logrus_prefixed_formatter//:go_default_library",
+        "@org_uber_go_automaxprocs//:go_default_library",
     ],
 )
 
-container_push(
-    name = "push_image",
-    format = "Docker",
-    image = ":image",
-    registry = "gcr.io",
-    repository = "prysmaticlabs/prysm/beacon-chain",
-    tag = "latest",
+container_bundle(
+    name = "image_bundle",
+    images = {
+        "gcr.io/prysmaticlabs/prysm/beacon-chain:latest": ":image",
+        "gcr.io/prysmaticlabs/prysm/beacon-chain:{DOCKER_TAG}": ":image",
+        "index.docker.io/prysmaticlabs/prysm-beacon-chain:latest": ":image",
+        "index.docker.io/prysmaticlabs/prysm-beacon-chain:{DOCKER_TAG}": ":image",
+    },
+    tags = ["manual"],
+)
+
+go_image_debug(
+    name = "image_debug",
+    image = ":image",
+    tags = ["manual"],
+)
+
+container_bundle(
+    name = "image_bundle_debug",
+    images = {
+        "gcr.io/prysmaticlabs/prysm/beacon-chain:latest-debug": ":image_debug",
+        "gcr.io/prysmaticlabs/prysm/beacon-chain:{DOCKER_TAG}-debug": ":image_debug",
+        "index.docker.io/prysmaticlabs/prysm-beacon-chain:latest-debug": ":image_debug",
+        "index.docker.io/prysmaticlabs/prysm-beacon-chain:{DOCKER_TAG}-debug": ":image_debug",
+    },
+    tags = ["manual"],
+)
+
+go_image_alpine(
+    name = "image_alpine",
+    image = ":image",
+    tags = ["manual"],
+)
+
+container_bundle(
+    name = "image_bundle_alpine",
+    images = {
+        "gcr.io/prysmaticlabs/prysm/beacon-chain:latest-alpine": ":image_alpine",
+        "gcr.io/prysmaticlabs/prysm/beacon-chain:{DOCKER_TAG}-alpine": ":image_alpine",
+        "index.docker.io/prysmaticlabs/prysm-beacon-chain:latest-alpine": ":image_alpine",
+        "index.docker.io/prysmaticlabs/prysm-beacon-chain:{DOCKER_TAG}-alpine": ":image_alpine",
+    },
+    tags = ["manual"],
+)
+
+docker_push(
+    name = "push_images",
+    bundle = ":image_bundle",
+    tags = ["manual"],
+)
+
+docker_push(
+    name = "push_images_debug",
+    bundle = ":image_bundle_debug",
+    tags = ["manual"],
+)
+
+docker_push(
+    name = "push_images_alpine",
+    bundle = ":image_bundle_alpine",
     tags = ["manual"],
-    visibility = ["//visibility:private"],
 )
 
 go_binary(
     name = "beacon-chain",
     embed = [":go_default_library"],
-    visibility = ["//beacon-chain:__subpackages__"],
+    visibility = [
+        "//beacon-chain:__subpackages__",
+        "//endtoend:__pkg__",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    size = "small",
+    srcs = ["usage_test.go"],
+    embed = [":go_default_library"],
+    deps = [
+        "//shared/featureconfig:go_default_library",
+        "@com_github_urfave_cli_v2//:go_default_library",
+    ],
 )

beacon-chain/README.md

@@ -5,6 +5,6 @@ This is the main project folder for the beacon chain implementation of Ethereum
 [![Discord](https://user-images.githubusercontent.com/7288322/34471967-1df7808a-efbb-11e7-9088-ed0b04151291.png)](https://discord.gg/KSA7rPr)
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/prysmaticlabs/prysm?badge&utm_medium=badge&utm_campaign=pr-badge)
 
-Also, read the latest beacon chain [design spec](https://github.com/ethereum/eth2.0-specs/blob/dev/specs/core/0_beacon-chain.md), this design spec serves as a source of truth for the beacon chain implementation we follow at prysmatic labs.
+Also, read the latest beacon chain [design spec](https://github.com/ethereum/eth2.0-specs/blob/dev/specs/phase0/beacon-chain.md), this design spec serves as a source of truth for the beacon chain implementation we follow at prysmatic labs.
 Check out the [FAQs](https://notes.ethereum.org/9MMuzWeFTTSg-3Tz_YeiBA?view). Refer this page on [why](http://email.mg2.substack.com/c/eJwlj9GOhCAMRb9G3jRQQPGBh5mM8xsbhKrsDGIAM9m_X9xN2qZtbpt7rCm4xvSjj5gLOTOmL-809CMbKXFaOKakIl4DZYr2AGyQIGjHOnWH22OiYnoIxmDijaBhhS6fcy7GvjobA9m0mSXOcnZq5GBqLkilXBZhBsus5ZK89VbKkRt-a-BZI6DzZ7iur1lQ953KJ9bemnxgahuQU9XJu6pFPdu8meT8vragzEjpMCwMGLlgLo6h5z1JumQTu4IJd4v15xqMf_8ZLP_Y1bSLdbnrD-LL71i2Kj7DLxaWWF4)
 we are combining sharding and casper together.

beacon-chain/archiver/BUILD.bazel

@@ -0,0 +1,46 @@
+load("@prysm//tools/go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["service.go"],
+    importpath = "github.com/prysmaticlabs/prysm/beacon-chain/archiver",
+    visibility = ["//beacon-chain:__subpackages__"],
+    deps = [
+        "//beacon-chain/blockchain:go_default_library",
+        "//beacon-chain/core/feed:go_default_library",
+        "//beacon-chain/core/feed/state:go_default_library",
+        "//beacon-chain/core/helpers:go_default_library",
+        "//beacon-chain/core/validators:go_default_library",
+        "//beacon-chain/db:go_default_library",
+        "//beacon-chain/state:go_default_library",
+        "//proto/beacon/p2p/v1:go_default_library",
+        "//shared/params:go_default_library",
+        "@com_github_pkg_errors//:go_default_library",
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:go_default_library",
+        "@com_github_sirupsen_logrus//:go_default_library",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["service_test.go"],
+    embed = [":go_default_library"],
+    deps = [
+        "//beacon-chain/blockchain/testing:go_default_library",
+        "//beacon-chain/core/epoch/precompute:go_default_library",
+        "//beacon-chain/core/feed:go_default_library",
+        "//beacon-chain/core/feed/state:go_default_library",
+        "//beacon-chain/core/helpers:go_default_library",
+        "//beacon-chain/db:go_default_library",
+        "//beacon-chain/db/testing:go_default_library",
+        "//beacon-chain/state:go_default_library",
+        "//proto/beacon/p2p/v1:go_default_library",
+        "//shared/params:go_default_library",
+        "//shared/testutil:go_default_library",
+        "@com_github_gogo_protobuf//proto:go_default_library",
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:go_default_library",
+        "@com_github_sirupsen_logrus//:go_default_library",
+        "@com_github_sirupsen_logrus//hooks/test:go_default_library",
+    ],
+)

beacon-chain/archiver/service.go

@@ -0,0 +1,200 @@
+package archiver
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/pkg/errors"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/blockchain"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
+	statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/validators"
+	"github.com/prysmaticlabs/prysm/beacon-chain/db"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/sirupsen/logrus"
+)
+
+var log = logrus.WithField("prefix", "archiver")
+
+// Service defining archiver functionality for persisting checkpointed
+// beacon chain information to a database backend for historical purposes.
+type Service struct {
+	ctx                  context.Context
+	cancel               context.CancelFunc
+	beaconDB             db.NoHeadAccessDatabase
+	headFetcher          blockchain.HeadFetcher
+	participationFetcher blockchain.ParticipationFetcher
+	stateNotifier        statefeed.Notifier
+	lastArchivedEpoch    uint64
+}
+
+// Config options for the archiver service.
+type Config struct {
+	BeaconDB             db.NoHeadAccessDatabase
+	HeadFetcher          blockchain.HeadFetcher
+	ParticipationFetcher blockchain.ParticipationFetcher
+	StateNotifier        statefeed.Notifier
+}
+
+// NewArchiverService initializes the service from configuration options.
+func NewArchiverService(ctx context.Context, cfg *Config) *Service {
+	ctx, cancel := context.WithCancel(ctx)
+	return &Service{
+		ctx:                  ctx,
+		cancel:               cancel,
+		beaconDB:             cfg.BeaconDB,
+		headFetcher:          cfg.HeadFetcher,
+		participationFetcher: cfg.ParticipationFetcher,
+		stateNotifier:        cfg.StateNotifier,
+	}
+}
+
+// Start the archiver service event loop.
+func (s *Service) Start() {
+	go s.run(s.ctx)
+}
+
+// Stop the archiver service event loop.
+func (s *Service) Stop() error {
+	defer s.cancel()
+	return nil
+}
+
+// Status reports the healthy status of the archiver. Returning nil means service
+// is correctly running without error.
+func (s *Service) Status() error {
+	return nil
+}
+
+// We archive committee information pertaining to the head state's epoch.
+func (s *Service) archiveCommitteeInfo(ctx context.Context, headState *state.BeaconState, epoch uint64) error {
+	proposerSeed, err := helpers.Seed(headState, epoch, params.BeaconConfig().DomainBeaconProposer)
+	if err != nil {
+		return errors.Wrap(err, "could not generate seed")
+	}
+	attesterSeed, err := helpers.Seed(headState, epoch, params.BeaconConfig().DomainBeaconAttester)
+	if err != nil {
+		return errors.Wrap(err, "could not generate seed")
+	}
+
+	info := &pb.ArchivedCommitteeInfo{
+		ProposerSeed: proposerSeed[:],
+		AttesterSeed: attesterSeed[:],
+	}
+	if err := s.beaconDB.SaveArchivedCommitteeInfo(ctx, epoch, info); err != nil {
+		return errors.Wrap(err, "could not archive committee info")
+	}
+	return nil
+}
+
+// We archive active validator set changes that happened during the previous epoch.
+func (s *Service) archiveActiveSetChanges(ctx context.Context, headState *state.BeaconState, epoch uint64) error {
+	prevEpoch := epoch - 1
+	vals := headState.Validators()
+	activations := validators.ActivatedValidatorIndices(prevEpoch, vals)
+	slashings := validators.SlashedValidatorIndices(prevEpoch, vals)
+	activeValidatorCount, err := helpers.ActiveValidatorCount(headState, prevEpoch)
+	if err != nil {
+		return errors.Wrap(err, "could not get active validator count")
+	}
+	exited, err := validators.ExitedValidatorIndices(prevEpoch, vals, activeValidatorCount)
+	if err != nil {
+		return errors.Wrap(err, "could not determine exited validator indices")
+	}
+	activeSetChanges := &pb.ArchivedActiveSetChanges{
+		Activated: activations,
+		Exited:    exited,
+		Slashed:   slashings,
+	}
+	if err := s.beaconDB.SaveArchivedActiveValidatorChanges(ctx, prevEpoch, activeSetChanges); err != nil {
+		return errors.Wrap(err, "could not archive active validator set changes")
+	}
+	return nil
+}
+
+// We compute participation metrics by first retrieving the head state and
+// matching validator attestations during the epoch.
+func (s *Service) archiveParticipation(ctx context.Context, epoch uint64) error {
+	pBal := s.participationFetcher.Participation(epoch)
+	participation := &ethpb.ValidatorParticipation{}
+	if pBal != nil {
+		participation = &ethpb.ValidatorParticipation{
+			EligibleEther:           pBal.ActivePrevEpoch,
+			VotedEther:              pBal.PrevEpochTargetAttested,
+			GlobalParticipationRate: float32(pBal.PrevEpochTargetAttested) / float32(pBal.ActivePrevEpoch),
+		}
+	}
+	return s.beaconDB.SaveArchivedValidatorParticipation(ctx, epoch, participation)
+}
+
+// We archive validator balances and active indices.
+func (s *Service) archiveBalances(ctx context.Context, balances []uint64, epoch uint64) error {
+	if err := s.beaconDB.SaveArchivedBalances(ctx, epoch, balances); err != nil {
+		return errors.Wrap(err, "could not archive balances")
+	}
+	return nil
+}
+
+func (s *Service) run(ctx context.Context) {
+	stateChannel := make(chan *feed.Event, 1)
+	stateSub := s.stateNotifier.StateFeed().Subscribe(stateChannel)
+	defer stateSub.Unsubscribe()
+	for {
+		select {
+		case event := <-stateChannel:
+			if event.Type == statefeed.BlockProcessed {
+				data, ok := event.Data.(*statefeed.BlockProcessedData)
+				if !ok {
+					log.Error("Event feed data is not type *statefeed.BlockProcessedData")
+					continue
+				}
+				log.WithField("headRoot", fmt.Sprintf("%#x", data.BlockRoot)).Debug("Received block processed event")
+				headState, err := s.headFetcher.HeadState(ctx)
+				if err != nil {
+					log.WithError(err).Error("Head state is not available")
+					continue
+				}
+				slot := headState.Slot()
+				currentEpoch := helpers.SlotToEpoch(slot)
+				if !helpers.IsEpochEnd(slot) && currentEpoch <= s.lastArchivedEpoch {
+					continue
+				}
+				epochToArchive := currentEpoch
+				if !helpers.IsEpochEnd(slot) {
+					epochToArchive--
+				}
+				if err := s.archiveCommitteeInfo(ctx, headState, epochToArchive); err != nil {
+					log.WithError(err).Error("Could not archive committee info")
+					continue
+				}
+				if err := s.archiveActiveSetChanges(ctx, headState, epochToArchive); err != nil {
+					log.WithError(err).Error("Could not archive active validator set changes")
+					continue
+				}
+				if err := s.archiveParticipation(ctx, epochToArchive); err != nil {
+					log.WithError(err).Error("Could not archive validator participation")
+					continue
+				}
+				if err := s.archiveBalances(ctx, headState.Balances(), epochToArchive); err != nil {
+					log.WithError(err).Error("Could not archive validator balances and active indices")
+					continue
+				}
+				log.WithField(
+					"epoch",
+					epochToArchive,
+				).Debug("Successfully archived beacon chain data during epoch")
+				s.lastArchivedEpoch = epochToArchive
+			}
+		case <-s.ctx.Done():
+			log.Debug("Context closed, exiting goroutine")
+			return
+		case err := <-stateSub.Err():
+			log.WithError(err).Error("Subscription to state feed notifier failed")
+			return
+		}
+	}
+}

beacon-chain/archiver/service_test.go

@@ -0,0 +1,474 @@
+package archiver
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"reflect"
+	"testing"
+
+	"github.com/gogo/protobuf/proto"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	mock "github.com/prysmaticlabs/prysm/beacon-chain/blockchain/testing"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
+	statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/db"
+	dbutil "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/testutil"
+	"github.com/sirupsen/logrus"
+	logTest "github.com/sirupsen/logrus/hooks/test"
+)
+
+func init() {
+	logrus.SetLevel(logrus.DebugLevel)
+	logrus.SetOutput(ioutil.Discard)
+}
+
+func TestArchiverService_ReceivesBlockProcessedEvent(t *testing.T) {
+	hook := logTest.NewGlobal()
+	svc, _ := setupService(t)
+	st := testutil.NewBeaconState()
+	if err := st.SetSlot(1); err != nil {
+		t.Fatal(err)
+	}
+	svc.headFetcher = &mock.ChainService{
+		State: st,
+	}
+
+	event := &feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			BlockRoot: [32]byte{1, 2, 3},
+			Verified:  true,
+		},
+	}
+	triggerStateEvent(t, svc, event)
+	testutil.AssertLogsContain(t, hook, fmt.Sprintf("%#x", event.Data.(*statefeed.BlockProcessedData).BlockRoot))
+	testutil.AssertLogsContain(t, hook, "Received block processed event")
+}
+
+func TestArchiverService_OnlyArchiveAtEpochEnd(t *testing.T) {
+	hook := logTest.NewGlobal()
+	svc, _ := setupService(t)
+	// The head state is NOT an epoch end.
+	st := testutil.NewBeaconState()
+	if err := st.SetSlot(params.BeaconConfig().SlotsPerEpoch - 2); err != nil {
+		t.Fatal(err)
+	}
+	svc.headFetcher = &mock.ChainService{
+		State: st,
+	}
+	event := &feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			BlockRoot: [32]byte{1, 2, 3},
+			Verified:  true,
+		},
+	}
+	triggerStateEvent(t, svc, event)
+
+	// The context should have been canceled.
+	if svc.ctx.Err() != context.Canceled {
+		t.Error("context was not canceled")
+	}
+	testutil.AssertLogsContain(t, hook, "Received block processed event")
+	// The service should ONLY log any archival logs if we receive a
+	// head slot that is an epoch end.
+	testutil.AssertLogsDoNotContain(t, hook, "Successfully archived")
+}
+
+func TestArchiverService_ArchivesEvenThroughSkipSlot(t *testing.T) {
+	hook := logTest.NewGlobal()
+	svc, _ := setupService(t)
+	validatorCount := uint64(100)
+	headState, err := setupState(validatorCount)
+	if err != nil {
+		t.Fatal(err)
+	}
+	event := &feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			BlockRoot: [32]byte{1, 2, 3},
+			Verified:  true,
+		},
+	}
+
+	exitRoutine := make(chan bool)
+	go func() {
+		svc.run(svc.ctx)
+		<-exitRoutine
+	}()
+
+	// Send out an event every slot, skipping the end slot of the epoch.
+	for i := uint64(0); i < params.BeaconConfig().SlotsPerEpoch+1; i++ {
+		if err := headState.SetSlot(i); err != nil {
+			t.Fatal(err)
+		}
+		svc.headFetcher = &mock.ChainService{
+			State: headState,
+		}
+		if helpers.IsEpochEnd(i) {
+			continue
+		}
+		// Send in a loop to ensure it is delivered (busy wait for the service to subscribe to the state feed).
+		for sent := 0; sent == 0; {
+			sent = svc.stateNotifier.StateFeed().Send(event)
+		}
+	}
+	if err := svc.Stop(); err != nil {
+		t.Fatal(err)
+	}
+	exitRoutine <- true
+
+	// The context should have been canceled.
+	if svc.ctx.Err() != context.Canceled {
+		t.Error("context was not canceled")
+	}
+
+	testutil.AssertLogsContain(t, hook, "Received block processed event")
+	// Even though there was a skip slot, we should still be able to archive
+	// upon the next block event afterwards.
+	testutil.AssertLogsContain(t, hook, "Successfully archived")
+}
+
+func TestArchiverService_ComputesAndSavesParticipation(t *testing.T) {
+	hook := logTest.NewGlobal()
+	validatorCount := uint64(100)
+	headState, err := setupState(validatorCount)
+	if err != nil {
+		t.Fatal(err)
+	}
+	svc, _ := setupService(t)
+	svc.headFetcher = &mock.ChainService{
+		State: headState,
+	}
+	event := &feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			BlockRoot: [32]byte{1, 2, 3},
+			Verified:  true,
+		},
+	}
+	triggerStateEvent(t, svc, event)
+
+	attestedBalance := uint64(1)
+
+	currentEpoch := helpers.CurrentEpoch(headState)
+	wanted := &ethpb.ValidatorParticipation{
+		VotedEther:              attestedBalance,
+		EligibleEther:           validatorCount * params.BeaconConfig().MaxEffectiveBalance,
+		GlobalParticipationRate: float32(attestedBalance) / float32(validatorCount*params.BeaconConfig().MaxEffectiveBalance),
+	}
+
+	retrieved, err := svc.beaconDB.ArchivedValidatorParticipation(svc.ctx, currentEpoch)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !proto.Equal(wanted, retrieved) {
+		t.Errorf("Wanted participation for epoch %d %v, retrieved %v", currentEpoch-1, wanted, retrieved)
+	}
+	testutil.AssertLogsContain(t, hook, "Successfully archived")
+}
+
+func TestArchiverService_SavesIndicesAndBalances(t *testing.T) {
+	hook := logTest.NewGlobal()
+	validatorCount := uint64(100)
+	headState, err := setupState(validatorCount)
+	if err != nil {
+		t.Fatal(err)
+	}
+	svc, _ := setupService(t)
+	svc.headFetcher = &mock.ChainService{
+		State: headState,
+	}
+	event := &feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			BlockRoot: [32]byte{1, 2, 3},
+			Verified:  true,
+		},
+	}
+	triggerStateEvent(t, svc, event)
+
+	retrieved, err := svc.beaconDB.ArchivedBalances(svc.ctx, helpers.CurrentEpoch(headState))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(headState.Balances(), retrieved) {
+		t.Errorf(
+			"Wanted balances for epoch %d %v, retrieved %v",
+			helpers.CurrentEpoch(headState),
+			headState.Balances(),
+			retrieved,
+		)
+	}
+	testutil.AssertLogsContain(t, hook, "Successfully archived")
+}
+
+func TestArchiverService_SavesCommitteeInfo(t *testing.T) {
+	hook := logTest.NewGlobal()
+	validatorCount := uint64(100)
+	headState, err := setupState(validatorCount)
+	if err != nil {
+		t.Fatal(err)
+	}
+	svc, _ := setupService(t)
+	svc.headFetcher = &mock.ChainService{
+		State: headState,
+	}
+	event := &feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			BlockRoot: [32]byte{1, 2, 3},
+			Verified:  true,
+		},
+	}
+	triggerStateEvent(t, svc, event)
+
+	currentEpoch := helpers.CurrentEpoch(headState)
+	proposerSeed, err := helpers.Seed(headState, currentEpoch, params.BeaconConfig().DomainBeaconProposer)
+	if err != nil {
+		t.Fatal(err)
+	}
+	attesterSeed, err := helpers.Seed(headState, currentEpoch, params.BeaconConfig().DomainBeaconAttester)
+	if err != nil {
+		t.Fatal(err)
+	}
+	wanted := &pb.ArchivedCommitteeInfo{
+		ProposerSeed: proposerSeed[:],
+		AttesterSeed: attesterSeed[:],
+	}
+
+	retrieved, err := svc.beaconDB.ArchivedCommitteeInfo(svc.ctx, helpers.CurrentEpoch(headState))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !proto.Equal(wanted, retrieved) {
+		t.Errorf(
+			"Wanted committee info for epoch %d %v, retrieved %v",
+			helpers.CurrentEpoch(headState),
+			wanted,
+			retrieved,
+		)
+	}
+	testutil.AssertLogsContain(t, hook, "Successfully archived")
+}
+
+func TestArchiverService_SavesActivatedValidatorChanges(t *testing.T) {
+	hook := logTest.NewGlobal()
+	validatorCount := uint64(100)
+	headState, err := setupState(validatorCount)
+	if err != nil {
+		t.Fatal(err)
+	}
+	svc, beaconDB := setupService(t)
+	svc.headFetcher = &mock.ChainService{
+		State: headState,
+	}
+	prevEpoch := helpers.PrevEpoch(headState)
+	delayedActEpoch := helpers.ActivationExitEpoch(prevEpoch)
+	val1, err := headState.ValidatorAtIndex(4)
+	if err != nil {
+		t.Fatal(err)
+	}
+	val1.ActivationEpoch = delayedActEpoch
+	val2, err := headState.ValidatorAtIndex(5)
+	if err != nil {
+		t.Fatal(err)
+	}
+	val2.ActivationEpoch = delayedActEpoch
+	if err := headState.UpdateValidatorAtIndex(4, val1); err != nil {
+		t.Fatal(err)
+	}
+	if err := headState.UpdateValidatorAtIndex(5, val1); err != nil {
+		t.Fatal(err)
+	}
+	event := &feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			BlockRoot: [32]byte{1, 2, 3},
+			Verified:  true,
+		},
+	}
+	triggerStateEvent(t, svc, event)
+
+	retrieved, err := beaconDB.ArchivedActiveValidatorChanges(svc.ctx, prevEpoch)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if retrieved == nil {
+		t.Fatal("Retrieved indices are nil")
+	}
+	if len(retrieved.Activated) != 98 {
+		t.Error("Did not get wanted active length")
+	}
+	testutil.AssertLogsContain(t, hook, "Successfully archived")
+}
+
+func TestArchiverService_SavesSlashedValidatorChanges(t *testing.T) {
+	hook := logTest.NewGlobal()
+	validatorCount := uint64(100)
+	headState, err := setupState(validatorCount)
+	if err != nil {
+		t.Fatal(err)
+	}
+	svc, beaconDB := setupService(t)
+	svc.headFetcher = &mock.ChainService{
+		State: headState,
+	}
+	prevEpoch := helpers.PrevEpoch(headState)
+	val1, err := headState.ValidatorAtIndex(95)
+	if err != nil {
+		t.Fatal(err)
+	}
+	val1.Slashed = true
+	val2, err := headState.ValidatorAtIndex(96)
+	if err != nil {
+		t.Fatal(err)
+	}
+	val2.Slashed = true
+	if err := headState.UpdateValidatorAtIndex(95, val1); err != nil {
+		t.Fatal(err)
+	}
+	if err := headState.UpdateValidatorAtIndex(96, val1); err != nil {
+		t.Fatal(err)
+	}
+	event := &feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			BlockRoot: [32]byte{1, 2, 3},
+			Verified:  true,
+		},
+	}
+	triggerStateEvent(t, svc, event)
+
+	retrieved, err := beaconDB.ArchivedActiveValidatorChanges(svc.ctx, prevEpoch)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if retrieved == nil {
+		t.Fatal("Retrieved indices are nil")
+	}
+	if !reflect.DeepEqual(retrieved.Slashed, []uint64{95, 96}) {
+		t.Errorf("Wanted indices 95, 96 slashed, received %v", retrieved.Slashed)
+	}
+	testutil.AssertLogsContain(t, hook, "Successfully archived")
+}
+
+func TestArchiverService_SavesExitedValidatorChanges(t *testing.T) {
+	hook := logTest.NewGlobal()
+	validatorCount := uint64(100)
+	headState, err := setupState(validatorCount)
+	if err != nil {
+		t.Fatal(err)
+	}
+	svc, beaconDB := setupService(t)
+	svc.headFetcher = &mock.ChainService{
+		State: headState,
+	}
+	prevEpoch := helpers.PrevEpoch(headState)
+	val, err := headState.ValidatorAtIndex(95)
+	if err != nil {
+		t.Fatal(err)
+	}
+	val.ExitEpoch = prevEpoch
+	val.WithdrawableEpoch = prevEpoch + params.BeaconConfig().MinValidatorWithdrawabilityDelay
+	if err := headState.UpdateValidatorAtIndex(95, val); err != nil {
+		t.Fatal(err)
+	}
+	event := &feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			BlockRoot: [32]byte{1, 2, 3},
+			Verified:  true,
+		},
+	}
+	triggerStateEvent(t, svc, event)
+	testutil.AssertLogsContain(t, hook, "Successfully archived")
+	retrieved, err := beaconDB.ArchivedActiveValidatorChanges(svc.ctx, prevEpoch)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if retrieved == nil {
+		t.Fatal("Retrieved indices are nil")
+	}
+	if !reflect.DeepEqual(retrieved.Exited, []uint64{95}) {
+		t.Errorf("Wanted indices 95 exited, received %v", retrieved.Exited)
+	}
+}
+
+func setupState(validatorCount uint64) (*stateTrie.BeaconState, error) {
+	validators := make([]*ethpb.Validator, validatorCount)
+	balances := make([]uint64, validatorCount)
+	for i := 0; i < len(validators); i++ {
+		validators[i] = &ethpb.Validator{
+			ExitEpoch:         params.BeaconConfig().FarFutureEpoch,
+			WithdrawableEpoch: params.BeaconConfig().FarFutureEpoch,
+			EffectiveBalance:  params.BeaconConfig().MaxEffectiveBalance,
+		}
+		balances[i] = params.BeaconConfig().MaxEffectiveBalance
+	}
+
+	atts := []*pb.PendingAttestation{{Data: &ethpb.AttestationData{Target: &ethpb.Checkpoint{}}}}
+
+	// We initialize a head state that has attestations from participated
+	// validators in a simulated fashion.
+	st := testutil.NewBeaconState()
+	if err := st.SetSlot((2 * params.BeaconConfig().SlotsPerEpoch) - 1); err != nil {
+		return nil, err
+	}
+	if err := st.SetValidators(validators); err != nil {
+		return nil, err
+	}
+	if err := st.SetBalances(balances); err != nil {
+		return nil, err
+	}
+	if err := st.SetCurrentEpochAttestations(atts); err != nil {
+		return nil, err
+	}
+	return st, nil
+}
+
+func setupService(t *testing.T) (*Service, db.Database) {
+	beaconDB, _ := dbutil.SetupDB(t)
+	ctx, cancel := context.WithCancel(context.Background())
+	validatorCount := uint64(100)
+	totalBalance := validatorCount * params.BeaconConfig().MaxEffectiveBalance
+	mockChainService := &mock.ChainService{}
+	return &Service{
+		beaconDB:      beaconDB,
+		ctx:           ctx,
+		cancel:        cancel,
+		stateNotifier: mockChainService.StateNotifier(),
+		participationFetcher: &mock.ChainService{
+			Balance: &precompute.Balance{ActivePrevEpoch: totalBalance, PrevEpochTargetAttested: 1}},
+	}, beaconDB
+}
+
+func triggerStateEvent(t *testing.T, svc *Service, event *feed.Event) {
+	exitRoutine := make(chan bool)
+	go func() {
+		svc.run(svc.ctx)
+		<-exitRoutine
+	}()
+
+	// Send in a loop to ensure it is delivered (busy wait for the service to subscribe to the state feed).
+	for sent := 0; sent == 0; {
+		sent = svc.stateNotifier.StateFeed().Send(event)
+	}
+	if err := svc.Stop(); err != nil {
+		t.Fatal(err)
+	}
+	exitRoutine <- true
+
+	// The context should have been canceled.
+	if svc.ctx.Err() != context.Canceled {
+		t.Error("context was not canceled")
+	}
+}

beacon-chain/attestation/BUILD.bazel

@@ -1,45 +0,0 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
-
-go_library(
-    name = "go_default_library",
-    srcs = [
-        "service.go",
-        "vote_metrics.go",
-    ],
-    importpath = "github.com/prysmaticlabs/prysm/beacon-chain/attestation",
-    visibility = ["//beacon-chain:__subpackages__"],
-    deps = [
-        "//beacon-chain/cache:go_default_library",
-        "//beacon-chain/core/helpers:go_default_library",
-        "//beacon-chain/core/state:go_default_library",
-        "//beacon-chain/db:go_default_library",
-        "//proto/beacon/p2p/v1:go_default_library",
-        "//shared/bitutil:go_default_library",
-        "//shared/bytesutil:go_default_library",
-        "//shared/event:go_default_library",
-        "//shared/hashutil:go_default_library",
-        "//shared/messagehandler:go_default_library",
-        "//shared/params:go_default_library",
-        "@com_github_gogo_protobuf//proto:go_default_library",
-        "@com_github_prometheus_client_golang//prometheus:go_default_library",
-        "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
-        "@com_github_sirupsen_logrus//:go_default_library",
-    ],
-)
-
-go_test(
-    name = "go_default_test",
-    srcs = ["service_test.go"],
-    embed = [":go_default_library"],
-    deps = [
-        "//beacon-chain/cache:go_default_library",
-        "//beacon-chain/internal:go_default_library",
-        "//proto/beacon/p2p/v1:go_default_library",
-        "//shared/bytesutil:go_default_library",
-        "//shared/hashutil:go_default_library",
-        "//shared/params:go_default_library",
-        "//shared/testutil:go_default_library",
-        "@com_github_sirupsen_logrus//:go_default_library",
-        "@com_github_sirupsen_logrus//hooks/test:go_default_library",
-    ],
-)

beacon-chain/attestation/service.go

@@ -1,333 +0,0 @@
-// Package attestation defines the life-cycle and status of single and aggregated attestation.
-package attestation
-
-import (
-	"context"
-	"fmt"
-	"sort"
-	"sync"
-
-	"github.com/gogo/protobuf/proto"
-	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
-	"github.com/prysmaticlabs/prysm/beacon-chain/db"
-	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	"github.com/prysmaticlabs/prysm/shared/bitutil"
-	"github.com/prysmaticlabs/prysm/shared/bytesutil"
-	"github.com/prysmaticlabs/prysm/shared/event"
-	"github.com/prysmaticlabs/prysm/shared/hashutil"
-	handler "github.com/prysmaticlabs/prysm/shared/messagehandler"
-	"github.com/prysmaticlabs/prysm/shared/params"
-	"github.com/sirupsen/logrus"
-)
-
-var log = logrus.WithField("prefix", "attestation")
-var committeeCache = cache.NewCommitteesCache()
-
-// TargetHandler provides an interface for fetching latest attestation targets
-// and updating attestations in batches.
-type TargetHandler interface {
-	LatestAttestationTarget(state *pb.BeaconState, validatorIndex uint64) (*pb.AttestationTarget, error)
-	BatchUpdateLatestAttestation(ctx context.Context, atts []*pb.Attestation) error
-}
-
-type attestationStore struct {
-	sync.RWMutex
-	m map[[48]byte]*pb.Attestation
-}
-
-// Service represents a service that handles the internal
-// logic of managing single and aggregated attestation.
-type Service struct {
-	ctx          context.Context
-	cancel       context.CancelFunc
-	beaconDB     *db.BeaconDB
-	incomingFeed *event.Feed
-	incomingChan chan *pb.Attestation
-	// store is the mapping of individual
-	// validator's public key to it's latest attestation.
-	store attestationStore
-}
-
-// Config options for the service.
-type Config struct {
-	BeaconDB *db.BeaconDB
-}
-
-// NewAttestationService instantiates a new service instance that will
-// be registered into a running beacon node.
-func NewAttestationService(ctx context.Context, cfg *Config) *Service {
-	ctx, cancel := context.WithCancel(ctx)
-	return &Service{
-		ctx:          ctx,
-		cancel:       cancel,
-		beaconDB:     cfg.BeaconDB,
-		incomingFeed: new(event.Feed),
-		incomingChan: make(chan *pb.Attestation, params.BeaconConfig().DefaultBufferSize),
-		store:        attestationStore{m: make(map[[48]byte]*pb.Attestation)},
-	}
-}
-
-// Start an attestation service's main event loop.
-func (a *Service) Start() {
-	log.Info("Starting service")
-	go a.attestationPool()
-}
-
-// Stop the Attestation service's main event loop and associated goroutines.
-func (a *Service) Stop() error {
-	defer a.cancel()
-	log.Info("Stopping service")
-	return nil
-}
-
-// Status always returns nil.
-// TODO(1201): Add service health checks.
-func (a *Service) Status() error {
-	return nil
-}
-
-// IncomingAttestationFeed returns a feed that any service can send incoming p2p attestations into.
-// The attestation service will subscribe to this feed in order to relay incoming attestations.
-func (a *Service) IncomingAttestationFeed() *event.Feed {
-	return a.incomingFeed
-}
-
-// LatestAttestationTarget returns the target block that the validator index attested to,
-// the highest slotNumber attestation in attestation pool gets returned.
-//
-// Spec pseudocode definition:
-//	Let `get_latest_attestation_target(store: Store, validator_index: ValidatorIndex) ->
-//		BeaconBlock` be the target block in the attestation
-//		`get_latest_attestation(store, validator_index)`.
-func (a *Service) LatestAttestationTarget(beaconState *pb.BeaconState, index uint64) (*pb.AttestationTarget, error) {
-	if index >= uint64(len(beaconState.ValidatorRegistry)) {
-		return nil, fmt.Errorf("invalid validator index %d", index)
-	}
-	validator := beaconState.ValidatorRegistry[index]
-
-	pubKey := bytesutil.ToBytes48(validator.Pubkey)
-	a.store.RLock()
-	defer a.store.RUnlock()
-	if _, exists := a.store.m[pubKey]; !exists {
-		return nil, nil
-	}
-
-	attestation := a.store.m[pubKey]
-	if attestation == nil {
-		return nil, nil
-	}
-	targetRoot := bytesutil.ToBytes32(attestation.Data.BeaconBlockRootHash32)
-	if !a.beaconDB.HasBlock(targetRoot) {
-		return nil, nil
-	}
-
-	return a.beaconDB.AttestationTarget(targetRoot)
-}
-
-// attestationPool takes an newly received attestation from sync service
-// and updates attestation pool.
-func (a *Service) attestationPool() {
-	incomingSub := a.incomingFeed.Subscribe(a.incomingChan)
-	defer incomingSub.Unsubscribe()
-	for {
-		select {
-		case <-a.ctx.Done():
-			log.Debug("Attestation pool closed, exiting goroutine")
-			return
-		// Listen for a newly received incoming attestation from the sync service.
-		case attestations := <-a.incomingChan:
-			handler.SafelyHandleMessage(a.ctx, a.handleAttestation, attestations)
-		}
-	}
-}
-
-func (a *Service) handleAttestation(ctx context.Context, msg proto.Message) error {
-	attestation := msg.(*pb.Attestation)
-	if err := a.UpdateLatestAttestation(ctx, attestation); err != nil {
-		return fmt.Errorf("could not update attestation pool: %v", err)
-	}
-	return nil
-}
-
-// UpdateLatestAttestation inputs an new attestation and checks whether
-// the attesters who submitted this attestation with the higher slot number
-// have been noted in the attestation pool. If not, it updates the
-// attestation pool with attester's public key to attestation.
-func (a *Service) UpdateLatestAttestation(ctx context.Context, attestation *pb.Attestation) error {
-	totalAttestationSeen.Inc()
-
-	// Potential improvement, instead of getting the state,
-	// we could get a mapping of validator index to public key.
-	beaconState, err := a.beaconDB.HeadState(ctx)
-	if err != nil {
-		return err
-	}
-	head, err := a.beaconDB.ChainHead()
-	if err != nil {
-		return err
-	}
-	headRoot, err := hashutil.HashBeaconBlock(head)
-	if err != nil {
-		return err
-	}
-	return a.updateAttestation(ctx, headRoot, beaconState, attestation)
-}
-
-// BatchUpdateLatestAttestation updates multiple attestations and adds them into the attestation store
-// if they are valid.
-func (a *Service) BatchUpdateLatestAttestation(ctx context.Context, attestations []*pb.Attestation) error {
-
-	if attestations == nil {
-		return nil
-	}
-	// Potential improvement, instead of getting the state,
-	// we could get a mapping of validator index to public key.
-	beaconState, err := a.beaconDB.HeadState(ctx)
-	if err != nil {
-		return err
-	}
-	head, err := a.beaconDB.ChainHead()
-	if err != nil {
-		return err
-	}
-	headRoot, err := hashutil.HashBeaconBlock(head)
-	if err != nil {
-		return err
-	}
-
-	attestations = a.sortAttestations(attestations)
-
-	for _, attestation := range attestations {
-		if err := a.updateAttestation(ctx, headRoot, beaconState, attestation); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// InsertAttestationIntoStore locks the store, inserts the attestation, then
-// unlocks the store again. This method may be used by external services
-// in testing to populate the attestation store.
-func (a *Service) InsertAttestationIntoStore(pubkey [48]byte, att *pb.Attestation) {
-	a.store.Lock()
-	defer a.store.Unlock()
-	a.store.m[pubkey] = att
-}
-
-func (a *Service) updateAttestation(ctx context.Context, headRoot [32]byte, beaconState *pb.BeaconState,
-	attestation *pb.Attestation) error {
-	totalAttestationSeen.Inc()
-
-	slot := attestation.Data.Slot
-	var committee []uint64
-	var cachedCommittees *cache.CommitteesInSlot
-	var err error
-
-	for beaconState.Slot < slot {
-		beaconState, err = state.ExecuteStateTransition(
-			ctx, beaconState, nil /* block */, headRoot, &state.TransitionConfig{},
-		)
-		if err != nil {
-			return fmt.Errorf("could not execute head transition: %v", err)
-		}
-	}
-
-	cachedCommittees, err = committeeCache.CommitteesInfoBySlot(slot)
-	if err != nil {
-		return err
-	}
-	if cachedCommittees == nil {
-		crosslinkCommittees, err := helpers.CrosslinkCommitteesAtSlot(beaconState, slot, false /* registryChange */)
-		if err != nil {
-			return err
-		}
-		cachedCommittees = helpers.ToCommitteeCache(slot, crosslinkCommittees)
-		if err := committeeCache.AddCommittees(cachedCommittees); err != nil {
-			return err
-		}
-	}
-
-	// Find committee for shard.
-	for _, v := range cachedCommittees.Committees {
-		if v.Shard == attestation.Data.Shard {
-			committee = v.Committee
-			break
-		}
-	}
-
-	log.WithFields(logrus.Fields{
-		"attestationSlot":    attestation.Data.Slot - params.BeaconConfig().GenesisSlot,
-		"attestationShard":   attestation.Data.Shard,
-		"committeesShard":    cachedCommittees.Committees[0].Shard,
-		"committeesList":     cachedCommittees.Committees[0].Committee,
-		"lengthOfCommittees": len(cachedCommittees.Committees),
-	}).Debug("Updating latest attestation")
-
-	// The participation bitfield from attestation is represented in bytes,
-	// here we multiply by 8 to get an accurate validator count in bits.
-	bitfield := attestation.AggregationBitfield
-	totalBits := len(bitfield) * 8
-
-	// Check each bit of participation bitfield to find out which
-	// attester has submitted new attestation.
-	// This is has O(n) run time and could be optimized down the line.
-	for i := 0; i < totalBits; i++ {
-		bitSet, err := bitutil.CheckBit(bitfield, i)
-		if err != nil {
-			return err
-		}
-		if !bitSet {
-			continue
-		}
-
-		if i >= len(committee) {
-			log.Errorf("Bitfield points to an invalid index in the committee: bitfield %08b", bitfield)
-			continue
-		}
-
-		if int(committee[i]) >= len(beaconState.ValidatorRegistry) {
-			log.Errorf("Index doesn't exist in validator registry: index %d", committee[i])
-		}
-
-		// If the attestation came from this attester. We use the slot committee to find the
-		// validator's actual index.
-		pubkey := bytesutil.ToBytes48(beaconState.ValidatorRegistry[committee[i]].Pubkey)
-		newAttestationSlot := attestation.Data.Slot
-		currentAttestationSlot := uint64(0)
-		a.store.Lock()
-		defer a.store.Unlock()
-		if _, exists := a.store.m[pubkey]; exists {
-			currentAttestationSlot = a.store.m[pubkey].Data.Slot
-		}
-		// If the attestation is newer than this attester's one in pool.
-		if newAttestationSlot > currentAttestationSlot {
-			a.store.m[pubkey] = attestation
-
-			log.WithFields(
-				logrus.Fields{
-					"attestationSlot": attestation.Data.Slot - params.BeaconConfig().GenesisSlot,
-					"justifiedEpoch":  attestation.Data.JustifiedEpoch - params.BeaconConfig().GenesisEpoch,
-				},
-			).Debug("Attestation store updated")
-
-			blockRoot := bytesutil.ToBytes32(attestation.Data.BeaconBlockRootHash32)
-			votedBlock, err := a.beaconDB.Block(blockRoot)
-			if err != nil {
-				return err
-			}
-			reportVoteMetrics(committee[i], votedBlock)
-		}
-	}
-	return nil
-}
-
-// sortAttestations sorts attestations by their slot number in ascending order.
-func (a *Service) sortAttestations(attestations []*pb.Attestation) []*pb.Attestation {
-	sort.SliceStable(attestations, func(i, j int) bool {
-		return attestations[i].Data.Slot < attestations[j].Data.Slot
-	})
-
-	return attestations
-}

beacon-chain/attestation/service_test.go

@@ -1,446 +0,0 @@
-package attestation
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-	"reflect"
-	"strings"
-	"testing"
-
-	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
-	"github.com/prysmaticlabs/prysm/beacon-chain/internal"
-	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	"github.com/prysmaticlabs/prysm/shared/bytesutil"
-	"github.com/prysmaticlabs/prysm/shared/hashutil"
-	"github.com/prysmaticlabs/prysm/shared/params"
-	"github.com/prysmaticlabs/prysm/shared/testutil"
-	"github.com/sirupsen/logrus"
-	logTest "github.com/sirupsen/logrus/hooks/test"
-)
-
-func init() {
-	logrus.SetLevel(logrus.DebugLevel)
-}
-
-var _ = TargetHandler(&Service{})
-
-func TestUpdateLatestAttestation_UpdatesLatest(t *testing.T) {
-	beaconDB := internal.SetupDB(t)
-	defer internal.TeardownDB(t, beaconDB)
-	ctx := context.Background()
-
-	var validators []*pb.Validator
-	for i := 0; i < 64; i++ {
-		validators = append(validators, &pb.Validator{
-			Pubkey:          []byte{byte(i)},
-			ActivationEpoch: params.BeaconConfig().GenesisEpoch,
-			ExitEpoch:       params.BeaconConfig().GenesisEpoch + 10,
-		})
-	}
-
-	beaconState := &pb.BeaconState{
-		Slot:              params.BeaconConfig().GenesisSlot + 1,
-		ValidatorRegistry: validators,
-	}
-	block := &pb.BeaconBlock{
-		Slot: params.BeaconConfig().GenesisSlot + 1,
-	}
-	if err := beaconDB.SaveBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if err := beaconDB.UpdateChainHead(ctx, block, beaconState); err != nil {
-		t.Fatal(err)
-	}
-	service := NewAttestationService(context.Background(), &Config{BeaconDB: beaconDB})
-
-	attestation := &pb.Attestation{
-		AggregationBitfield: []byte{0x80},
-		Data: &pb.AttestationData{
-			Slot:  params.BeaconConfig().GenesisSlot + 1,
-			Shard: 1,
-		},
-	}
-
-	if err := service.UpdateLatestAttestation(ctx, attestation); err != nil {
-		t.Fatalf("could not update latest attestation: %v", err)
-	}
-	pubkey := bytesutil.ToBytes48([]byte{byte(3)})
-	if service.store.m[pubkey].Data.Slot !=
-		attestation.Data.Slot {
-		t.Errorf("Incorrect slot stored, wanted: %d, got: %d",
-			attestation.Data.Slot, service.store.m[pubkey].Data.Slot)
-	}
-
-	beaconState = &pb.BeaconState{
-		Slot:              params.BeaconConfig().GenesisSlot + 36,
-		ValidatorRegistry: validators,
-	}
-	if err := beaconDB.UpdateChainHead(ctx, block, beaconState); err != nil {
-		t.Fatalf("could not save state: %v", err)
-	}
-
-	attestation.Data.Slot = params.BeaconConfig().GenesisSlot + 36
-	attestation.Data.Shard = 36
-	if err := service.UpdateLatestAttestation(ctx, attestation); err != nil {
-		t.Fatalf("could not update latest attestation: %v", err)
-	}
-	if service.store.m[pubkey].Data.Slot !=
-		attestation.Data.Slot {
-		t.Errorf("Incorrect slot stored, wanted: %d, got: %d",
-			attestation.Data.Slot, service.store.m[pubkey].Data.Slot)
-	}
-}
-
-func TestAttestationPool_UpdatesAttestationPool(t *testing.T) {
-	beaconDB := internal.SetupDB(t)
-	defer internal.TeardownDB(t, beaconDB)
-	ctx := context.Background()
-
-	var validators []*pb.Validator
-	for i := 0; i < 64; i++ {
-		validators = append(validators, &pb.Validator{
-			Pubkey:          []byte{byte(i)},
-			ActivationEpoch: params.BeaconConfig().GenesisEpoch,
-			ExitEpoch:       params.BeaconConfig().GenesisEpoch + 10,
-		})
-	}
-	beaconState := &pb.BeaconState{
-		Slot:              params.BeaconConfig().GenesisSlot + 1,
-		ValidatorRegistry: validators,
-	}
-	block := &pb.BeaconBlock{
-		Slot: params.BeaconConfig().GenesisSlot + 1,
-	}
-	if err := beaconDB.SaveBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if err := beaconDB.UpdateChainHead(ctx, block, beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	service := NewAttestationService(context.Background(), &Config{BeaconDB: beaconDB})
-	attestation := &pb.Attestation{
-		AggregationBitfield: []byte{0x80},
-		Data: &pb.AttestationData{
-			Slot:  params.BeaconConfig().GenesisSlot + 1,
-			Shard: 1,
-		},
-	}
-
-	if err := service.handleAttestation(context.Background(), attestation); err != nil {
-		t.Error(err)
-	}
-}
-
-func TestLatestAttestationTarget_CantGetAttestation(t *testing.T) {
-	beaconDB := internal.SetupDB(t)
-	defer internal.TeardownDB(t, beaconDB)
-	ctx := context.Background()
-
-	if err := beaconDB.SaveState(ctx, &pb.BeaconState{
-		ValidatorRegistry: []*pb.Validator{{}},
-	}); err != nil {
-		t.Fatalf("could not save state: %v", err)
-	}
-	service := NewAttestationService(context.Background(), &Config{BeaconDB: beaconDB})
-	headState, err := beaconDB.HeadState(ctx)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	index := uint64(100)
-	want := fmt.Sprintf("invalid validator index %d", index)
-	if _, err := service.LatestAttestationTarget(headState, index); !strings.Contains(err.Error(), want) {
-		t.Errorf("Wanted error to contain %s, received %v", want, err)
-	}
-}
-
-func TestLatestAttestationTarget_ReturnsLatestAttestedBlock(t *testing.T) {
-	beaconDB := internal.SetupDB(t)
-	defer internal.TeardownDB(t, beaconDB)
-	ctx := context.Background()
-
-	pubKey := []byte{'A'}
-	if err := beaconDB.SaveState(ctx, &pb.BeaconState{
-		ValidatorRegistry: []*pb.Validator{{Pubkey: pubKey}},
-	}); err != nil {
-		t.Fatalf("could not save state: %v", err)
-	}
-
-	block := &pb.BeaconBlock{Slot: 999}
-	if err := beaconDB.SaveBlock(block); err != nil {
-		t.Fatalf("could not save block: %v", err)
-	}
-	blockRoot, err := hashutil.HashBeaconBlock(block)
-	if err != nil {
-		log.Fatalf("could not hash block: %v", err)
-	}
-	if err := beaconDB.SaveAttestationTarget(ctx, &pb.AttestationTarget{
-		Slot:       block.Slot,
-		BlockRoot:  blockRoot[:],
-		ParentRoot: []byte{},
-	}); err != nil {
-		log.Fatalf("could not save att target: %v", err)
-	}
-
-	service := NewAttestationService(context.Background(), &Config{BeaconDB: beaconDB})
-
-	attestation := &pb.Attestation{
-		Data: &pb.AttestationData{
-			BeaconBlockRootHash32: blockRoot[:],
-		}}
-	pubKey48 := bytesutil.ToBytes48(pubKey)
-	service.store.m[pubKey48] = attestation
-
-	headState, err := beaconDB.HeadState(ctx)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	latestAttestedTarget, err := service.LatestAttestationTarget(headState, 0)
-	if err != nil {
-		t.Fatalf("Could not get latest attestation: %v", err)
-	}
-
-	if !bytes.Equal(blockRoot[:], latestAttestedTarget.BlockRoot) {
-		t.Errorf("Wanted: %v, got: %v", blockRoot[:], latestAttestedTarget.BlockRoot)
-	}
-}
-
-func TestUpdateLatestAttestation_CacheEnabledAndMiss(t *testing.T) {
-
-	beaconDB := internal.SetupDB(t)
-	defer internal.TeardownDB(t, beaconDB)
-	ctx := context.Background()
-
-	var validators []*pb.Validator
-	for i := 0; i < 64; i++ {
-		validators = append(validators, &pb.Validator{
-			Pubkey:          []byte{byte(i)},
-			ActivationEpoch: params.BeaconConfig().GenesisEpoch,
-			ExitEpoch:       params.BeaconConfig().GenesisEpoch + 10,
-		})
-	}
-
-	beaconState := &pb.BeaconState{
-		Slot:              params.BeaconConfig().GenesisSlot + 1,
-		ValidatorRegistry: validators,
-	}
-	block := &pb.BeaconBlock{
-		Slot: params.BeaconConfig().GenesisSlot + 1,
-	}
-	if err := beaconDB.SaveBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if err := beaconDB.UpdateChainHead(ctx, block, beaconState); err != nil {
-		t.Fatal(err)
-	}
-	service := NewAttestationService(context.Background(), &Config{BeaconDB: beaconDB})
-
-	attestation := &pb.Attestation{
-		AggregationBitfield: []byte{0x80},
-		Data: &pb.AttestationData{
-			Slot:  params.BeaconConfig().GenesisSlot + 1,
-			Shard: 1,
-		},
-	}
-
-	if err := service.UpdateLatestAttestation(ctx, attestation); err != nil {
-		t.Fatalf("could not update latest attestation: %v", err)
-	}
-	pubkey := bytesutil.ToBytes48([]byte{byte(3)})
-	if service.store.m[pubkey].Data.Slot !=
-		attestation.Data.Slot {
-		t.Errorf("Incorrect slot stored, wanted: %d, got: %d",
-			attestation.Data.Slot, service.store.m[pubkey].Data.Slot)
-	}
-
-	attestation.Data.Slot = params.BeaconConfig().GenesisSlot + 36
-	attestation.Data.Shard = 36
-
-	beaconState = &pb.BeaconState{
-		Slot:              params.BeaconConfig().GenesisSlot + 36,
-		ValidatorRegistry: validators,
-	}
-	if err := beaconDB.UpdateChainHead(ctx, block, beaconState); err != nil {
-		t.Fatalf("could not save state: %v", err)
-	}
-
-	if err := service.UpdateLatestAttestation(ctx, attestation); err != nil {
-		t.Fatalf("could not update latest attestation: %v", err)
-	}
-	if service.store.m[pubkey].Data.Slot !=
-		attestation.Data.Slot {
-		t.Errorf("Incorrect slot stored, wanted: %d, got: %d",
-			attestation.Data.Slot, service.store.m[pubkey].Data.Slot)
-	}
-
-	// Verify the committee for attestation's data slot was cached.
-	fetchedCommittees, err := committeeCache.CommitteesInfoBySlot(attestation.Data.Slot)
-	if err != nil {
-		t.Fatal(err)
-	}
-	wantedCommittee := []uint64{38}
-	if !reflect.DeepEqual(wantedCommittee, fetchedCommittees.Committees[0].Committee) {
-		t.Errorf(
-			"Result indices was an unexpected value. Wanted %d, got %d",
-			wantedCommittee,
-			fetchedCommittees.Committees[0].Committee,
-		)
-	}
-}
-
-func TestUpdateLatestAttestation_CacheEnabledAndHit(t *testing.T) {
-
-	var validators []*pb.Validator
-	for i := 0; i < 64; i++ {
-		validators = append(validators, &pb.Validator{
-			Pubkey:          []byte{byte(i)},
-			ActivationEpoch: params.BeaconConfig().GenesisEpoch,
-			ExitEpoch:       params.BeaconConfig().GenesisEpoch + 10,
-		})
-	}
-
-	beaconDB := internal.SetupDB(t)
-	defer internal.TeardownDB(t, beaconDB)
-	ctx := context.Background()
-
-	beaconState := &pb.BeaconState{
-		Slot:              params.BeaconConfig().GenesisSlot + 2,
-		ValidatorRegistry: validators,
-	}
-	block := &pb.BeaconBlock{
-		Slot: params.BeaconConfig().GenesisSlot + 2,
-	}
-	if err := beaconDB.SaveBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if err := beaconDB.UpdateChainHead(ctx, block, beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	service := NewAttestationService(context.Background(), &Config{BeaconDB: beaconDB})
-
-	slot := params.BeaconConfig().GenesisSlot + 2
-	shard := uint64(3)
-	index := uint64(4)
-	attestation := &pb.Attestation{
-		AggregationBitfield: []byte{0x80},
-		Data: &pb.AttestationData{
-			Slot:  slot,
-			Shard: shard,
-		},
-	}
-
-	csInSlot := &cache.CommitteesInSlot{
-		Slot: slot,
-		Committees: []*cache.CommitteeInfo{
-			{Shard: shard, Committee: []uint64{index, 999}},
-		}}
-
-	if err := committeeCache.AddCommittees(csInSlot); err != nil {
-		t.Fatal(err)
-	}
-
-	if err := service.UpdateLatestAttestation(ctx, attestation); err != nil {
-		t.Fatalf("could not update latest attestation: %v", err)
-	}
-	pubkey := bytesutil.ToBytes48([]byte{byte(index)})
-	if err := service.UpdateLatestAttestation(ctx, attestation); err != nil {
-		t.Fatalf("could not update latest attestation: %v", err)
-	}
-
-	if service.store.m[pubkey].Data.Slot !=
-		attestation.Data.Slot {
-		t.Errorf("Incorrect slot stored, wanted: %d, got: %d",
-			attestation.Data.Slot, service.store.m[pubkey].Data.Slot)
-	}
-}
-
-func TestUpdateLatestAttestation_InvalidIndex(t *testing.T) {
-	beaconDB := internal.SetupDB(t)
-	hook := logTest.NewGlobal()
-	defer internal.TeardownDB(t, beaconDB)
-	ctx := context.Background()
-
-	var validators []*pb.Validator
-	for i := 0; i < 64; i++ {
-		validators = append(validators, &pb.Validator{
-			Pubkey:          []byte{byte(i)},
-			ActivationEpoch: params.BeaconConfig().GenesisEpoch,
-			ExitEpoch:       params.BeaconConfig().GenesisEpoch + 10,
-		})
-	}
-
-	beaconState := &pb.BeaconState{
-		Slot:              params.BeaconConfig().GenesisSlot + 1,
-		ValidatorRegistry: validators,
-	}
-	block := &pb.BeaconBlock{
-		Slot: params.BeaconConfig().GenesisSlot + 1,
-	}
-	if err := beaconDB.SaveBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if err := beaconDB.UpdateChainHead(ctx, block, beaconState); err != nil {
-		t.Fatal(err)
-	}
-	service := NewAttestationService(context.Background(), &Config{BeaconDB: beaconDB})
-	attestation := &pb.Attestation{
-		AggregationBitfield: []byte{0xC0},
-		Data: &pb.AttestationData{
-			Slot:  params.BeaconConfig().GenesisSlot + 1,
-			Shard: 1,
-		},
-	}
-
-	if err := service.UpdateLatestAttestation(ctx, attestation); err != nil {
-		t.Fatalf("could not update latest attestation: %v", err)
-	}
-	testutil.AssertLogsContain(t, hook, "Bitfield points to an invalid index in the committee")
-}
-
-func TestUpdateLatestAttestation_BatchUpdate(t *testing.T) {
-	beaconDB := internal.SetupDB(t)
-	defer internal.TeardownDB(t, beaconDB)
-	ctx := context.Background()
-
-	var validators []*pb.Validator
-	for i := 0; i < 64; i++ {
-		validators = append(validators, &pb.Validator{
-			Pubkey:          []byte{byte(i)},
-			ActivationEpoch: params.BeaconConfig().GenesisEpoch,
-			ExitEpoch:       params.BeaconConfig().GenesisEpoch + 10,
-		})
-	}
-
-	beaconState := &pb.BeaconState{
-		Slot:              params.BeaconConfig().GenesisSlot + 1,
-		ValidatorRegistry: validators,
-	}
-	block := &pb.BeaconBlock{
-		Slot: params.BeaconConfig().GenesisSlot + 1,
-	}
-	if err := beaconDB.SaveBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if err := beaconDB.UpdateChainHead(ctx, block, beaconState); err != nil {
-		t.Fatal(err)
-	}
-	service := NewAttestationService(context.Background(), &Config{BeaconDB: beaconDB})
-	attestations := make([]*pb.Attestation, 0)
-	for i := 0; i < 10; i++ {
-		attestations = append(attestations, &pb.Attestation{
-			AggregationBitfield: []byte{0x80},
-			Data: &pb.AttestationData{
-				Slot:  params.BeaconConfig().GenesisSlot + 1,
-				Shard: 1,
-			},
-		})
-	}
-
-	if err := service.BatchUpdateLatestAttestation(ctx, attestations); err != nil {
-		t.Fatalf("could not update latest attestation: %v", err)
-	}
-}

beacon-chain/attestation/vote_metrics.go

@@ -1,34 +0,0 @@
-package attestation
-
-import (
-	"strconv"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
-	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	"github.com/prysmaticlabs/prysm/shared/params"
-)
-
-var (
-	validatorLastVoteGauge = promauto.NewGaugeVec(prometheus.GaugeOpts{
-		Name: "validators_last_vote",
-		Help: "Votes of validators, updated when there's a new attestation",
-	}, []string{
-		"validatorIndex",
-	})
-	totalAttestationSeen = promauto.NewGauge(prometheus.GaugeOpts{
-		Name: "total_seen_attestations",
-		Help: "Total number of attestations seen by the validators",
-	})
-)
-
-func reportVoteMetrics(index uint64, block *pb.BeaconBlock) {
-	// Don't update vote metrics if the incoming block is nil.
-	if block == nil {
-		return
-	}
-
-	s := params.BeaconConfig().GenesisSlot
-	validatorLastVoteGauge.WithLabelValues(
-		"v" + strconv.Itoa(int(index))).Set(float64(block.Slot - s))
-}

beacon-chain/blockchain/BUILD.bazel

@@ -1,75 +1,153 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
+load("@prysm//tools/go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_test")
 
 go_library(
     name = "go_default_library",
     srcs = [
-        "block_processing.go",
-        "fork_choice.go",
+        "chain_info.go",
+        "head.go",
+        "info.go",
+        "init_sync_process_block.go",
+        "log.go",
+        "metrics.go",
+        "process_attestation.go",
+        "process_attestation_helpers.go",
+        "process_block.go",
+        "process_block_helpers.go",
+        "receive_attestation.go",
+        "receive_block.go",
         "service.go",
     ],
     importpath = "github.com/prysmaticlabs/prysm/beacon-chain/blockchain",
     visibility = ["//beacon-chain:__subpackages__"],
     deps = [
-        "//beacon-chain/attestation:go_default_library",
         "//beacon-chain/cache:go_default_library",
+        "//beacon-chain/cache/depositcache:go_default_library",
         "//beacon-chain/core/blocks:go_default_library",
+        "//beacon-chain/core/epoch/precompute:go_default_library",
+        "//beacon-chain/core/feed:go_default_library",
+        "//beacon-chain/core/feed/state:go_default_library",
         "//beacon-chain/core/helpers:go_default_library",
         "//beacon-chain/core/state:go_default_library",
-        "//beacon-chain/core/validators:go_default_library",
         "//beacon-chain/db:go_default_library",
-        "//beacon-chain/operations:go_default_library",
+        "//beacon-chain/db/filters:go_default_library",
+        "//beacon-chain/flags:go_default_library",
+        "//beacon-chain/forkchoice:go_default_library",
+        "//beacon-chain/forkchoice/protoarray:go_default_library",
+        "//beacon-chain/operations/attestations:go_default_library",
+        "//beacon-chain/operations/slashings:go_default_library",
+        "//beacon-chain/operations/voluntaryexits:go_default_library",
+        "//beacon-chain/p2p:go_default_library",
         "//beacon-chain/powchain:go_default_library",
+        "//beacon-chain/state:go_default_library",
+        "//beacon-chain/state/stategen:go_default_library",
+        "//beacon-chain/state/stateutil:go_default_library",
         "//proto/beacon/p2p/v1:go_default_library",
-        "//proto/beacon/rpc/v1:go_default_library",
+        "//shared/attestationutil:go_default_library",
         "//shared/bytesutil:go_default_library",
-        "//shared/event:go_default_library",
         "//shared/featureconfig:go_default_library",
-        "//shared/hashutil:go_default_library",
-        "//shared/p2p:go_default_library",
         "//shared/params:go_default_library",
+        "//shared/roughtime:go_default_library",
+        "//shared/slotutil:go_default_library",
+        "//shared/traceutil:go_default_library",
+        "@com_github_emicklei_dot//:go_default_library",
+        "@com_github_pkg_errors//:go_default_library",
         "@com_github_prometheus_client_golang//prometheus:go_default_library",
         "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
         "@io_opencensus_go//trace:go_default_library",
     ],
 )
 
-go_test(
+test_suite(
     name = "go_default_test",
+    tests = [
+        ":go_raceoff_test",
+        ":go_raceon_test",
+    ],
+)
+
+go_test(
+    name = "go_raceoff_test",
+    size = "medium",
     srcs = [
-        "block_processing_test.go",
-        "fork_choice_reorg_test.go",
-        "fork_choice_test.go",
+        "chain_info_test.go",
+        "head_test.go",
+        "init_sync_process_block_test.go",
+        "process_attestation_test.go",
+        "process_block_test.go",
+        "receive_attestation_test.go",
         "service_test.go",
     ],
     embed = [":go_default_library"],
     deps = [
-        "//beacon-chain/attestation:go_default_library",
-        "//beacon-chain/cache:go_default_library",
+        "//beacon-chain/cache/depositcache:go_default_library",
         "//beacon-chain/core/blocks:go_default_library",
         "//beacon-chain/core/helpers:go_default_library",
         "//beacon-chain/core/state:go_default_library",
-        "//beacon-chain/core/validators:go_default_library",
         "//beacon-chain/db:go_default_library",
-        "//beacon-chain/internal:go_default_library",
+        "//beacon-chain/db/testing:go_default_library",
+        "//beacon-chain/p2p:go_default_library",
         "//beacon-chain/powchain:go_default_library",
+        "//beacon-chain/state/stateutil:go_default_library",
+        "//proto/beacon/db:go_default_library",
         "//proto/beacon/p2p/v1:go_default_library",
-        "//proto/beacon/rpc/v1:go_default_library",
-        "//shared/bls:go_default_library",
         "//shared/bytesutil:go_default_library",
         "//shared/event:go_default_library",
-        "//shared/featureconfig:go_default_library",
-        "//shared/forkutil:go_default_library",
-        "//shared/hashutil:go_default_library",
-        "//shared/p2p:go_default_library",
         "//shared/params:go_default_library",
         "//shared/testutil:go_default_library",
-        "//shared/trieutil:go_default_library",
         "@com_github_ethereum_go_ethereum//:go_default_library",
         "@com_github_ethereum_go_ethereum//common:go_default_library",
         "@com_github_ethereum_go_ethereum//core/types:go_default_library",
         "@com_github_gogo_protobuf//proto:go_default_library",
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:go_default_library",
+        "@com_github_prysmaticlabs_go_ssz//:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
         "@com_github_sirupsen_logrus//hooks/test:go_default_library",
+        "@in_gopkg_d4l3k_messagediff_v1//:go_default_library",
+        "@org_golang_x_net//context:go_default_library",
+    ],
+)
+
+go_test(
+    name = "go_raceon_test",
+    srcs = [
+        "chain_info_norace_test.go",
+        "service_norace_test.go",
+    ],
+    embed = [":go_default_library"],
+    gc_goopts = [
+        # Go 1.14 enables checkptr by default when building with -race or -msan. There is a pointer
+        # issue in boltdb, so must disable checkptr at compile time. This flag can be removed once
+        # the project is migrated to etcd's version of boltdb and the issue has been fixed.
+        # See: https://github.com/etcd-io/bbolt/issues/187.
+        "-d=checkptr=0",
+    ],
+    race = "on",
+    tags = ["race_on"],
+    deps = [
+        "//beacon-chain/cache/depositcache:go_default_library",
+        "//beacon-chain/core/blocks:go_default_library",
+        "//beacon-chain/core/helpers:go_default_library",
+        "//beacon-chain/core/state:go_default_library",
+        "//beacon-chain/db:go_default_library",
+        "//beacon-chain/db/testing:go_default_library",
+        "//beacon-chain/p2p:go_default_library",
+        "//beacon-chain/powchain:go_default_library",
+        "//proto/beacon/p2p/v1:go_default_library",
+        "//shared/bytesutil:go_default_library",
+        "//shared/event:go_default_library",
+        "//shared/params:go_default_library",
+        "//shared/testutil:go_default_library",
+        "@com_github_ethereum_go_ethereum//:go_default_library",
+        "@com_github_ethereum_go_ethereum//common:go_default_library",
+        "@com_github_ethereum_go_ethereum//core/types:go_default_library",
+        "@com_github_gogo_protobuf//proto:go_default_library",
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:go_default_library",
+        "@com_github_prysmaticlabs_go_ssz//:go_default_library",
+        "@com_github_sirupsen_logrus//:go_default_library",
+        "@com_github_sirupsen_logrus//hooks/test:go_default_library",
+        "@org_golang_x_net//context:go_default_library",
     ],
 )

beacon-chain/blockchain/block_processing.go

@@ -1,343 +0,0 @@
-package blockchain
-
-import (
-	"bytes"
-	"context"
-	"errors"
-	"fmt"
-
-	b "github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/validators"
-	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	pbrpc "github.com/prysmaticlabs/prysm/proto/beacon/rpc/v1"
-	"github.com/prysmaticlabs/prysm/shared/bytesutil"
-	"github.com/prysmaticlabs/prysm/shared/event"
-	"github.com/prysmaticlabs/prysm/shared/featureconfig"
-	"github.com/prysmaticlabs/prysm/shared/hashutil"
-	"github.com/prysmaticlabs/prysm/shared/params"
-	"github.com/sirupsen/logrus"
-	"go.opencensus.io/trace"
-)
-
-// BlockReceiver interface defines the methods in the blockchain service which
-// directly receives a new block from other services and applies the full processing pipeline.
-type BlockReceiver interface {
-	CanonicalBlockFeed() *event.Feed
-	ReceiveBlock(ctx context.Context, block *pb.BeaconBlock) (*pb.BeaconState, error)
-	IsCanonical(slot uint64, hash []byte) bool
-	InsertsCanonical(slot uint64, hash []byte)
-	RecentCanonicalRoots(count uint64) []*pbrpc.BlockRoot
-}
-
-// BlockProcessor defines a common interface for methods useful for directly applying state transitions
-// to beacon blocks and generating a new beacon state from the Ethereum 2.0 core primitives.
-type BlockProcessor interface {
-	VerifyBlockValidity(ctx context.Context, block *pb.BeaconBlock, beaconState *pb.BeaconState) error
-	ApplyBlockStateTransition(ctx context.Context, block *pb.BeaconBlock, beaconState *pb.BeaconState) (*pb.BeaconState, error)
-	CleanupBlockOperations(ctx context.Context, block *pb.BeaconBlock) error
-}
-
-// BlockFailedProcessingErr represents a block failing a state transition function.
-type BlockFailedProcessingErr struct {
-	err error
-}
-
-func (b *BlockFailedProcessingErr) Error() string {
-	return fmt.Sprintf("block failed processing: %v", b.err)
-}
-
-// ReceiveBlock is a function that defines the operations that are preformed on
-// any block that is received from p2p layer or rpc. It performs the following actions: It checks the block to see
-// 1. Verify a block passes pre-processing conditions
-// 2. Save and broadcast the block via p2p to other peers
-// 3. Apply the block state transition function and account for skip slots.
-// 4. Process and cleanup any block operations, such as attestations and deposits, which would need to be
-//    either included or flushed from the beacon node's runtime.
-func (c *ChainService) ReceiveBlock(ctx context.Context, block *pb.BeaconBlock) (*pb.BeaconState, error) {
-	c.receiveBlockLock.Lock()
-	defer c.receiveBlockLock.Unlock()
-	ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.ReceiveBlock")
-	defer span.End()
-	parentRoot := bytesutil.ToBytes32(block.ParentRootHash32)
-	parent, err := c.beaconDB.Block(parentRoot)
-	if err != nil {
-		return nil, fmt.Errorf("failed to get parent block: %v", err)
-	}
-	if parent == nil {
-		return nil, errors.New("parent does not exist in DB")
-	}
-	beaconState, err := c.beaconDB.HistoricalStateFromSlot(ctx, parent.Slot)
-	if err != nil {
-		return nil, fmt.Errorf("could not retrieve beacon state: %v", err)
-	}
-	saveLatestBlock := beaconState.LatestBlock
-
-	blockRoot, err := hashutil.HashBeaconBlock(block)
-	if err != nil {
-		return nil, fmt.Errorf("could not hash beacon block")
-	}
-	// We first verify the block's basic validity conditions.
-	if err := c.VerifyBlockValidity(ctx, block, beaconState); err != nil {
-		return beaconState, fmt.Errorf("block with slot %d is not ready for processing: %v", block.Slot, err)
-	}
-
-	// We save the block to the DB and broadcast it to our peers.
-	if err := c.SaveAndBroadcastBlock(ctx, block); err != nil {
-		return beaconState, fmt.Errorf(
-			"could not save and broadcast beacon block with slot %d: %v",
-			block.Slot-params.BeaconConfig().GenesisSlot, err,
-		)
-	}
-
-	log.WithField("slotNumber", block.Slot-params.BeaconConfig().GenesisSlot).Info(
-		"Executing state transition")
-
-	// We then apply the block state transition accordingly to obtain the resulting beacon state.
-	beaconState, err = c.ApplyBlockStateTransition(ctx, block, beaconState)
-	if err != nil {
-		switch err.(type) {
-		case *BlockFailedProcessingErr:
-			// If the block fails processing, we mark it as blacklisted and delete it from our DB.
-			c.beaconDB.MarkEvilBlockHash(blockRoot)
-			if err := c.beaconDB.DeleteBlock(block); err != nil {
-				return nil, fmt.Errorf("could not delete bad block from db: %v", err)
-			}
-			return beaconState, err
-		default:
-			return beaconState, fmt.Errorf("could not apply block state transition: %v", err)
-		}
-	}
-
-	log.WithFields(logrus.Fields{
-		"slotNumber":   block.Slot - params.BeaconConfig().GenesisSlot,
-		"currentEpoch": helpers.SlotToEpoch(block.Slot) - params.BeaconConfig().GenesisEpoch,
-	}).Info("State transition complete")
-
-	// Check state root
-	if featureconfig.FeatureConfig().EnableCheckBlockStateRoot {
-		// Calc state hash with previous block
-		beaconState.LatestBlock = saveLatestBlock
-		stateRoot, err := hashutil.HashProto(beaconState)
-		if err != nil {
-			return nil, fmt.Errorf("could not hash beacon state: %v", err)
-		}
-		beaconState.LatestBlock = block
-		if !bytes.Equal(block.StateRootHash32, stateRoot[:]) {
-			return nil, fmt.Errorf("beacon state root is not equal to block state root: %#x != %#x", stateRoot, block.StateRootHash32)
-		}
-	}
-
-	// We process the block's contained deposits, attestations, and other operations
-	// and that may need to be stored or deleted from the beacon node's persistent storage.
-	if err := c.CleanupBlockOperations(ctx, block); err != nil {
-		return beaconState, fmt.Errorf("could not process block deposits, attestations, and other operations: %v", err)
-	}
-
-	log.WithField("slot", block.Slot-params.BeaconConfig().GenesisSlot).Info("Finished processing beacon block")
-	return beaconState, nil
-}
-
-// ApplyBlockStateTransition runs the Ethereum 2.0 state transition function
-// to produce a new beacon state and also accounts for skip slots occurring.
-//
-//  def apply_block_state_transition(block):
-//  	# process skipped slots
-// 		while (state.slot < block.slot - 1):
-//      	state = slot_state_transition(state, block=None)
-//
-//		# process slot with block
-//		state = slot_state_transition(state, block)
-//
-//		# check state root
-//      if block.state_root == hash(state):
-//			return state, error
-//		else:
-//			return nil, error  # or throw or whatever
-//
-func (c *ChainService) ApplyBlockStateTransition(
-	ctx context.Context, block *pb.BeaconBlock, beaconState *pb.BeaconState,
-) (*pb.BeaconState, error) {
-	// Retrieve the last processed beacon block's hash root.
-	headRoot, err := c.ChainHeadRoot()
-	if err != nil {
-		return beaconState, fmt.Errorf("could not retrieve chain head root: %v", err)
-	}
-
-	// Check for skipped slots.
-	numSkippedSlots := 0
-	for beaconState.Slot < block.Slot-1 {
-		beaconState, err = c.runStateTransition(ctx, headRoot, nil, beaconState)
-		if err != nil {
-			return beaconState, err
-		}
-		numSkippedSlots++
-	}
-	if numSkippedSlots > 0 {
-		log.Warnf("Processed %d skipped slots", numSkippedSlots)
-	}
-
-	beaconState, err = c.runStateTransition(ctx, headRoot, block, beaconState)
-	if err != nil {
-		return beaconState, err
-	}
-	return beaconState, nil
-}
-
-// VerifyBlockValidity cross-checks the block against the pre-processing conditions from
-// Ethereum 2.0, namely:
-//   The parent block with root block.parent_root has been processed and accepted.
-//   The node has processed its state up to slot, block.slot - 1.
-//   The Ethereum 1.0 block pointed to by the state.processed_pow_receipt_root has been processed and accepted.
-//   The node's local clock time is greater than or equal to state.genesis_time + block.slot * SECONDS_PER_SLOT.
-func (c *ChainService) VerifyBlockValidity(
-	ctx context.Context,
-	block *pb.BeaconBlock,
-	beaconState *pb.BeaconState,
-) error {
-	if block.Slot == params.BeaconConfig().GenesisSlot {
-		return fmt.Errorf("cannot process a genesis block: received block with slot %d",
-			block.Slot-params.BeaconConfig().GenesisSlot)
-	}
-	powBlockFetcher := c.web3Service.Client().BlockByHash
-	if err := b.IsValidBlock(ctx, beaconState, block,
-		c.beaconDB.HasBlock, powBlockFetcher, c.genesisTime); err != nil {
-		return fmt.Errorf("block does not fulfill pre-processing conditions %v", err)
-	}
-	return nil
-}
-
-// SaveAndBroadcastBlock stores the block in persistent storage and then broadcasts it to
-// peers via p2p. Blocks which have already been saved are not processed again via p2p, which is why
-// the order of operations is important in this function to prevent infinite p2p loops.
-func (c *ChainService) SaveAndBroadcastBlock(ctx context.Context, block *pb.BeaconBlock) error {
-	blockRoot, err := hashutil.HashBeaconBlock(block)
-	if err != nil {
-		return fmt.Errorf("could not tree hash incoming block: %v", err)
-	}
-	if err := c.beaconDB.SaveBlock(block); err != nil {
-		return fmt.Errorf("failed to save block: %v", err)
-	}
-	if err := c.beaconDB.SaveAttestationTarget(ctx, &pb.AttestationTarget{
-		Slot:       block.Slot,
-		BlockRoot:  blockRoot[:],
-		ParentRoot: block.ParentRootHash32,
-	}); err != nil {
-		return fmt.Errorf("failed to save attestation target: %v", err)
-	}
-	// Announce the new block to the network.
-	c.p2p.Broadcast(ctx, &pb.BeaconBlockAnnounce{
-		Hash:       blockRoot[:],
-		SlotNumber: block.Slot,
-	})
-	return nil
-}
-
-// CleanupBlockOperations processes and cleans up any block operations relevant to the beacon node
-// such as attestations, exits, and deposits. We update the latest seen attestation by validator
-// in the local node's runtime, cleanup and remove pending deposits which have been included in the block
-// from our node's local cache, and process validator exits and more.
-func (c *ChainService) CleanupBlockOperations(ctx context.Context, block *pb.BeaconBlock) error {
-	// Forward processed block to operation pool to remove individual operation from DB.
-	if c.opsPoolService.IncomingProcessedBlockFeed().Send(block) == 0 {
-		log.Error("Sent processed block to no subscribers")
-	}
-
-	if err := c.attsService.BatchUpdateLatestAttestation(ctx, block.Body.Attestations); err != nil {
-		return fmt.Errorf("failed to update latest attestation for store: %v", err)
-	}
-
-	// Remove pending deposits from the deposit queue.
-	for _, dep := range block.Body.Deposits {
-		c.beaconDB.RemovePendingDeposit(ctx, dep)
-	}
-	return nil
-}
-
-// runStateTransition executes the Ethereum 2.0 core state transition for the beacon chain and
-// updates important checkpoints and local persistent data during epoch transitions. It serves as a wrapper
-// around the more low-level, core state transition function primitive.
-func (c *ChainService) runStateTransition(
-	ctx context.Context,
-	headRoot [32]byte,
-	block *pb.BeaconBlock,
-	beaconState *pb.BeaconState,
-) (*pb.BeaconState, error) {
-	newState, err := state.ExecuteStateTransition(
-		ctx,
-		beaconState,
-		block,
-		headRoot,
-		&state.TransitionConfig{
-			VerifySignatures: false, // We disable signature verification for now.
-			Logging:          true,  // We enable logging in this state transition call.
-		},
-	)
-	if err != nil {
-		return beaconState, &BlockFailedProcessingErr{err}
-	}
-	log.WithField(
-		"slotsSinceGenesis", newState.Slot-params.BeaconConfig().GenesisSlot,
-	).Info("Slot transition successfully processed")
-
-	if block != nil {
-		log.WithField(
-			"slotsSinceGenesis", newState.Slot-params.BeaconConfig().GenesisSlot,
-		).Info("Block transition successfully processed")
-
-		// Save Historical States.
-		if err := c.beaconDB.SaveHistoricalState(ctx, beaconState); err != nil {
-			return nil, fmt.Errorf("could not save historical state: %v", err)
-		}
-	}
-
-	if helpers.IsEpochEnd(newState.Slot) {
-		// Save activated validators of this epoch to public key -> index DB.
-		if err := c.saveValidatorIdx(newState); err != nil {
-			return newState, fmt.Errorf("could not save validator index: %v", err)
-		}
-		// Delete exited validators of this epoch to public key -> index DB.
-		if err := c.deleteValidatorIdx(newState); err != nil {
-			return newState, fmt.Errorf("could not delete validator index: %v", err)
-		}
-		// Update FFG checkpoints in DB.
-		if err := c.updateFFGCheckPts(ctx, newState); err != nil {
-			return newState, fmt.Errorf("could not update FFG checkpts: %v", err)
-		}
-		log.WithField(
-			"SlotsSinceGenesis", newState.Slot-params.BeaconConfig().GenesisSlot,
-		).Info("Epoch transition successfully processed")
-	}
-	return newState, nil
-}
-
-// saveValidatorIdx saves the validators public key to index mapping in DB, these
-// validators were activated from current epoch. After it saves, current epoch key
-// is deleted from ActivatedValidators mapping.
-func (c *ChainService) saveValidatorIdx(state *pb.BeaconState) error {
-	activatedValidators := validators.ActivatedValFromEpoch(helpers.CurrentEpoch(state) + 1)
-	for _, idx := range activatedValidators {
-		pubKey := state.ValidatorRegistry[idx].Pubkey
-		if err := c.beaconDB.SaveValidatorIndex(pubKey, int(idx)); err != nil {
-			return fmt.Errorf("could not save validator index: %v", err)
-		}
-	}
-	validators.DeleteActivatedVal(helpers.CurrentEpoch(state))
-	return nil
-}
-
-// deleteValidatorIdx deletes the validators public key to index mapping in DB, the
-// validators were exited from current epoch. After it deletes, current epoch key
-// is deleted from ExitedValidators mapping.
-func (c *ChainService) deleteValidatorIdx(state *pb.BeaconState) error {
-	exitedValidators := validators.ExitedValFromEpoch(helpers.CurrentEpoch(state) + 1)
-	for _, idx := range exitedValidators {
-		pubKey := state.ValidatorRegistry[idx].Pubkey
-		if err := c.beaconDB.DeleteValidatorIndex(pubKey); err != nil {
-			return fmt.Errorf("could not delete validator index: %v", err)
-		}
-	}
-	validators.DeleteExitedVal(helpers.CurrentEpoch(state))
-	return nil
-}

beacon-chain/blockchain/block_processing_test.go

@@ -1,840 +0,0 @@
-package blockchain
-
-import (
-	"context"
-	"encoding/binary"
-	"math/big"
-	"strings"
-	"testing"
-	"time"
-
-	"github.com/prysmaticlabs/prysm/beacon-chain/attestation"
-	b "github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
-	v "github.com/prysmaticlabs/prysm/beacon-chain/core/validators"
-	"github.com/prysmaticlabs/prysm/beacon-chain/internal"
-	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	"github.com/prysmaticlabs/prysm/shared/bytesutil"
-	"github.com/prysmaticlabs/prysm/shared/featureconfig"
-	"github.com/prysmaticlabs/prysm/shared/hashutil"
-	"github.com/prysmaticlabs/prysm/shared/params"
-	"github.com/prysmaticlabs/prysm/shared/testutil"
-	"github.com/prysmaticlabs/prysm/shared/trieutil"
-	logTest "github.com/sirupsen/logrus/hooks/test"
-)
-
-// Ensure ChainService implements interfaces.
-var _ = BlockProcessor(&ChainService{})
-
-func initBlockStateRoot(t *testing.T, block *pb.BeaconBlock, chainService *ChainService) {
-	parentRoot := bytesutil.ToBytes32(block.ParentRootHash32)
-	parent, err := chainService.beaconDB.Block(parentRoot)
-	if err != nil {
-		t.Fatal(err)
-	}
-	beaconState, err := chainService.beaconDB.HistoricalStateFromSlot(context.Background(), parent.Slot)
-	if err != nil {
-		t.Fatalf("Unable to retrieve state %v", err)
-	}
-	saveLatestBlock := beaconState.LatestBlock
-
-	computedState, err := chainService.ApplyBlockStateTransition(context.Background(), block, beaconState)
-	if err != nil {
-		t.Fatalf("could not apply block state transition: %v", err)
-	}
-
-	computedState.LatestBlock = saveLatestBlock
-	stateRoot, err := hashutil.HashProto(computedState)
-	if err != nil {
-		t.Fatalf("could not tree hash state: %v", err)
-	}
-	block.StateRootHash32 = stateRoot[:]
-	t.Logf("state root after block: %#x", stateRoot)
-}
-
-func TestReceiveBlock_FaultyPOWChain(t *testing.T) {
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	chainService := setupBeaconChain(t, db, nil)
-	unixTime := uint64(time.Now().Unix())
-	deposits, _ := setupInitialDeposits(t, 100)
-	if err := db.InitializeState(context.Background(), unixTime, deposits, &pb.Eth1Data{}); err != nil {
-		t.Fatalf("Could not initialize beacon state to disk: %v", err)
-	}
-
-	if err := SetSlotInState(chainService, 1); err != nil {
-		t.Fatal(err)
-	}
-
-	parentBlock := &pb.BeaconBlock{
-		Slot: 1,
-	}
-
-	parentRoot, err := hashutil.HashBeaconBlock(parentBlock)
-	if err != nil {
-		t.Fatalf("Unable to tree hash block %v", err)
-	}
-
-	if err := chainService.beaconDB.SaveBlock(parentBlock); err != nil {
-		t.Fatalf("Unable to save block %v", err)
-	}
-
-	block := &pb.BeaconBlock{
-		Slot:             2,
-		ParentRootHash32: parentRoot[:],
-		Eth1Data: &pb.Eth1Data{
-			DepositRootHash32: []byte("a"),
-			BlockHash32:       []byte("b"),
-		},
-	}
-
-	if err := chainService.beaconDB.SaveBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if _, err := chainService.ReceiveBlock(context.Background(), block); err == nil {
-		t.Errorf("Expected receive block to fail, received nil: %v", err)
-	}
-}
-
-func TestReceiveBlock_ProcessCorrectly(t *testing.T) {
-	hook := logTest.NewGlobal()
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	ctx := context.Background()
-
-	chainService := setupBeaconChain(t, db, nil)
-	deposits, privKeys := setupInitialDeposits(t, 100)
-	eth1Data := &pb.Eth1Data{
-		DepositRootHash32: []byte{},
-		BlockHash32:       []byte{},
-	}
-	beaconState, err := state.GenesisBeaconState(deposits, 0, eth1Data)
-	if err != nil {
-		t.Fatalf("Can't generate genesis state: %v", err)
-	}
-	stateRoot, err := hashutil.HashProto(beaconState)
-	if err != nil {
-		t.Fatalf("Could not tree hash state: %v", err)
-	}
-	if err := db.SaveHistoricalState(ctx, beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	genesis := b.NewGenesisBlock([]byte{})
-	if err := chainService.beaconDB.SaveBlock(genesis); err != nil {
-		t.Fatalf("Could not save block to db: %v", err)
-	}
-	parentHash, err := hashutil.HashBeaconBlock(genesis)
-	if err != nil {
-		t.Fatalf("Unable to get tree hash root of canonical head: %v", err)
-	}
-	if err := chainService.beaconDB.UpdateChainHead(ctx, genesis, beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	beaconState.Slot++
-	randaoReveal := createRandaoReveal(t, beaconState, privKeys)
-
-	block := &pb.BeaconBlock{
-		Slot:             beaconState.Slot,
-		StateRootHash32:  stateRoot[:],
-		ParentRootHash32: parentHash[:],
-		RandaoReveal:     randaoReveal,
-		Eth1Data: &pb.Eth1Data{
-			DepositRootHash32: []byte("a"),
-			BlockHash32:       []byte("b"),
-		},
-		Body: &pb.BeaconBlockBody{
-			Attestations: nil,
-		},
-	}
-
-	initBlockStateRoot(t, block, chainService)
-
-	if err := chainService.beaconDB.SaveJustifiedBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if err := chainService.beaconDB.SaveFinalizedBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if err := chainService.beaconDB.SaveBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if _, err := chainService.ReceiveBlock(context.Background(), block); err != nil {
-		t.Errorf("Block failed processing: %v", err)
-	}
-
-	testutil.AssertLogsContain(t, hook, "Finished processing beacon block")
-}
-
-func TestReceiveBlock_UsesParentBlockState(t *testing.T) {
-	hook := logTest.NewGlobal()
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	ctx := context.Background()
-
-	chainService := setupBeaconChain(t, db, nil)
-	deposits, _ := setupInitialDeposits(t, 100)
-	eth1Data := &pb.Eth1Data{
-		DepositRootHash32: []byte{},
-		BlockHash32:       []byte{},
-	}
-	beaconState, err := state.GenesisBeaconState(deposits, 0, eth1Data)
-	if err != nil {
-		t.Fatalf("Can't generate genesis state: %v", err)
-	}
-	if err := chainService.beaconDB.SaveHistoricalState(ctx, beaconState); err != nil {
-		t.Fatal(err)
-	}
-	stateRoot, err := hashutil.HashProto(beaconState)
-	if err != nil {
-		t.Fatalf("Could not tree hash state: %v", err)
-	}
-
-	parentHash, genesisBlock := setupGenesisBlock(t, chainService)
-	if err := chainService.beaconDB.UpdateChainHead(ctx, genesisBlock, beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	// We ensure the block uses the right state parent if its ancestor is not block.Slot-1.
-	block := &pb.BeaconBlock{
-		Slot:             beaconState.Slot + 4,
-		StateRootHash32:  stateRoot[:],
-		ParentRootHash32: parentHash[:],
-		RandaoReveal:     []byte{},
-		Eth1Data: &pb.Eth1Data{
-			DepositRootHash32: []byte("a"),
-			BlockHash32:       []byte("b"),
-		},
-		Body: &pb.BeaconBlockBody{
-			Attestations: nil,
-		},
-	}
-	initBlockStateRoot(t, block, chainService)
-	if err := chainService.beaconDB.SaveBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if _, err := chainService.ReceiveBlock(context.Background(), block); err != nil {
-		t.Errorf("Block failed processing: %v", err)
-	}
-	testutil.AssertLogsContain(t, hook, "Finished processing beacon block")
-}
-
-func TestReceiveBlock_DeletesBadBlock(t *testing.T) {
-	featureconfig.InitFeatureConfig(&featureconfig.FeatureFlagConfig{
-		EnableCheckBlockStateRoot: false,
-	})
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	ctx := context.Background()
-
-	chainService := setupBeaconChain(t, db, nil)
-	deposits, _ := setupInitialDeposits(t, 100)
-	eth1Data := &pb.Eth1Data{
-		DepositRootHash32: []byte{},
-		BlockHash32:       []byte{},
-	}
-	beaconState, err := state.GenesisBeaconState(deposits, 0, eth1Data)
-	if err != nil {
-		t.Fatalf("Can't generate genesis state: %v", err)
-	}
-	stateRoot, err := hashutil.HashProto(beaconState)
-	if err != nil {
-		t.Fatalf("Could not tree hash state: %v", err)
-	}
-	if err := chainService.beaconDB.SaveHistoricalState(ctx, beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	parentHash, genesisBlock := setupGenesisBlock(t, chainService)
-	if err := chainService.beaconDB.UpdateChainHead(ctx, genesisBlock, beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	beaconState.Slot++
-
-	block := &pb.BeaconBlock{
-		Slot:             beaconState.Slot,
-		StateRootHash32:  stateRoot[:],
-		ParentRootHash32: parentHash[:],
-		RandaoReveal:     []byte{},
-		Eth1Data: &pb.Eth1Data{
-			DepositRootHash32: []byte("a"),
-			BlockHash32:       []byte("b"),
-		},
-		Body: &pb.BeaconBlockBody{
-			Attestations: []*pb.Attestation{
-				{
-					Data: &pb.AttestationData{
-						JustifiedEpoch: params.BeaconConfig().GenesisSlot * 100,
-					},
-				},
-			},
-		},
-	}
-
-	blockRoot, err := hashutil.HashBeaconBlock(block)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	_, err = chainService.ReceiveBlock(context.Background(), block)
-	switch err.(type) {
-	case *BlockFailedProcessingErr:
-		t.Log("Block failed processing as expected")
-	default:
-		t.Errorf("Unexpected block processing error: %v", err)
-	}
-
-	savedBlock, err := db.Block(blockRoot)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if savedBlock != nil {
-		t.Errorf("Expected bad block to have been deleted, received: %v", savedBlock)
-	}
-	// We also verify the block has been blacklisted.
-	if !db.IsEvilBlockHash(blockRoot) {
-		t.Error("Expected block root to have been blacklisted")
-	}
-	featureconfig.InitFeatureConfig(&featureconfig.FeatureFlagConfig{
-		EnableCheckBlockStateRoot: true,
-	})
-}
-
-func TestReceiveBlock_CheckBlockStateRoot_GoodState(t *testing.T) {
-	hook := logTest.NewGlobal()
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	ctx := context.Background()
-
-	attsService := attestation.NewAttestationService(
-		context.Background(),
-		&attestation.Config{BeaconDB: db})
-	chainService := setupBeaconChain(t, db, attsService)
-	deposits, privKeys := setupInitialDeposits(t, 100)
-	eth1Data := &pb.Eth1Data{
-		DepositRootHash32: []byte{},
-		BlockHash32:       []byte{},
-	}
-	beaconState, err := state.GenesisBeaconState(deposits, 0, eth1Data)
-	if err != nil {
-		t.Fatalf("Can't generate genesis state: %v", err)
-	}
-	if err := chainService.beaconDB.SaveHistoricalState(ctx, beaconState); err != nil {
-		t.Fatal(err)
-	}
-	parentHash, genesisBlock := setupGenesisBlock(t, chainService)
-	beaconState.Slot++
-	if err := chainService.beaconDB.UpdateChainHead(ctx, genesisBlock, beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	beaconState.Slot++
-	goodStateBlock := &pb.BeaconBlock{
-		Slot:             beaconState.Slot,
-		ParentRootHash32: parentHash[:],
-		RandaoReveal:     createRandaoReveal(t, beaconState, privKeys),
-		Body:             &pb.BeaconBlockBody{},
-	}
-	beaconState.Slot--
-	initBlockStateRoot(t, goodStateBlock, chainService)
-
-	if err := chainService.beaconDB.SaveBlock(goodStateBlock); err != nil {
-		t.Fatal(err)
-	}
-
-	_, err = chainService.ReceiveBlock(context.Background(), goodStateBlock)
-	if err != nil {
-		t.Fatalf("error exists for good block %v", err)
-	}
-	testutil.AssertLogsContain(t, hook, "Executing state transition")
-}
-
-func TestReceiveBlock_CheckBlockStateRoot_BadState(t *testing.T) {
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	chainService := setupBeaconChain(t, db, nil)
-	deposits, privKeys := setupInitialDeposits(t, 100)
-	ctx := context.Background()
-	eth1Data := &pb.Eth1Data{
-		DepositRootHash32: []byte{},
-		BlockHash32:       []byte{},
-	}
-	beaconState, err := state.GenesisBeaconState(deposits, 0, eth1Data)
-	if err != nil {
-		t.Fatalf("Can't generate genesis state: %v", err)
-	}
-	if err := chainService.beaconDB.SaveHistoricalState(ctx, beaconState); err != nil {
-		t.Fatal(err)
-	}
-	parentHash, genesisBlock := setupGenesisBlock(t, chainService)
-	beaconState.Slot++
-	if err := chainService.beaconDB.UpdateChainHead(ctx, genesisBlock, beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	beaconState.Slot++
-	invalidStateBlock := &pb.BeaconBlock{
-		Slot:             beaconState.Slot,
-		StateRootHash32:  []byte{'b', 'a', 'd', ' ', 'h', 'a', 's', 'h'},
-		ParentRootHash32: parentHash[:],
-		RandaoReveal:     createRandaoReveal(t, beaconState, privKeys),
-		Body:             &pb.BeaconBlockBody{},
-	}
-	beaconState.Slot--
-
-	_, err = chainService.ReceiveBlock(context.Background(), invalidStateBlock)
-	if err == nil {
-		t.Fatal("no error for wrong block state root")
-	}
-	if !strings.Contains(err.Error(), "beacon state root is not equal to block state root: ") {
-		t.Fatal(err)
-	}
-}
-
-func TestReceiveBlock_RemovesPendingDeposits(t *testing.T) {
-	hook := logTest.NewGlobal()
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	ctx := context.Background()
-
-	attsService := attestation.NewAttestationService(
-		context.Background(),
-		&attestation.Config{BeaconDB: db})
-	chainService := setupBeaconChain(t, db, attsService)
-	deposits, privKeys := setupInitialDeposits(t, 100)
-	eth1Data := &pb.Eth1Data{
-		DepositRootHash32: []byte{},
-		BlockHash32:       []byte{},
-	}
-	beaconState, err := state.GenesisBeaconState(deposits, 0, eth1Data)
-	if err != nil {
-		t.Fatalf("Can't generate genesis state: %v", err)
-	}
-	if err := chainService.beaconDB.SaveJustifiedState(beaconState); err != nil {
-		t.Fatal(err)
-	}
-	if err := db.SaveFinalizedState(beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	stateRoot, err := hashutil.HashProto(beaconState)
-	if err != nil {
-		t.Fatalf("Could not tree hash state: %v", err)
-	}
-	parentHash, genesisBlock := setupGenesisBlock(t, chainService)
-	beaconState.Slot++
-	if err := chainService.beaconDB.UpdateChainHead(ctx, genesisBlock, beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	currentSlot := params.BeaconConfig().GenesisSlot
-	randaoReveal := createRandaoReveal(t, beaconState, privKeys)
-
-	pendingDeposits := []*pb.Deposit{
-		createPreChainStartDeposit(t, []byte{'F'}, beaconState.DepositIndex),
-	}
-	pendingDepositsData := make([][]byte, len(pendingDeposits))
-	for i, pd := range pendingDeposits {
-		pendingDepositsData[i] = pd.DepositData
-	}
-	depositTrie, err := trieutil.GenerateTrieFromItems(pendingDepositsData, int(params.BeaconConfig().DepositContractTreeDepth))
-	if err != nil {
-		t.Fatalf("Could not generate deposit trie: %v", err)
-	}
-	for i := range pendingDeposits {
-		pendingDeposits[i].MerkleTreeIndex = 0
-		proof, err := depositTrie.MerkleProof(int(pendingDeposits[i].MerkleTreeIndex))
-		if err != nil {
-			t.Fatalf("Could not generate proof: %v", err)
-		}
-		pendingDeposits[i].MerkleProofHash32S = proof
-	}
-	depositRoot := depositTrie.Root()
-	beaconState.LatestEth1Data.DepositRootHash32 = depositRoot[:]
-	if err := db.SaveHistoricalState(context.Background(), beaconState); err != nil {
-		t.Fatal(err)
-	}
-
-	block := &pb.BeaconBlock{
-		Slot:             currentSlot + 1,
-		StateRootHash32:  stateRoot[:],
-		ParentRootHash32: parentHash[:],
-		RandaoReveal:     randaoReveal,
-		Eth1Data: &pb.Eth1Data{
-			DepositRootHash32: []byte("a"),
-			BlockHash32:       []byte("b"),
-		},
-		Body: &pb.BeaconBlockBody{
-			Deposits: pendingDeposits,
-		},
-	}
-
-	beaconState.Slot--
-	beaconState.DepositIndex = 0
-	if err := chainService.beaconDB.SaveState(ctx, beaconState); err != nil {
-		t.Fatal(err)
-	}
-	initBlockStateRoot(t, block, chainService)
-
-	blockRoot, err := hashutil.HashBeaconBlock(block)
-	if err != nil {
-		log.Fatalf("could not hash block: %v", err)
-	}
-
-	if err := chainService.beaconDB.SaveJustifiedBlock(block); err != nil {
-		t.Fatal(err)
-	}
-	if err := chainService.beaconDB.SaveFinalizedBlock(block); err != nil {
-		t.Fatal(err)
-	}
-
-	for _, dep := range pendingDeposits {
-		db.InsertPendingDeposit(chainService.ctx, dep, big.NewInt(0))
-	}
-
-	if len(db.PendingDeposits(chainService.ctx, nil)) != len(pendingDeposits) || len(pendingDeposits) == 0 {
-		t.Fatalf("Expected %d pending deposits", len(pendingDeposits))
-	}
-
-	beaconState.Slot--
-	if err := chainService.beaconDB.SaveState(ctx, beaconState); err != nil {
-		t.Fatal(err)
-	}
-	if err := db.SaveHistoricalState(context.Background(), beaconState); err != nil {
-		t.Fatal(err)
-	}
-	computedState, err := chainService.ReceiveBlock(context.Background(), block)
-	if err != nil {
-		t.Fatal(err)
-	}
-	for i := 0; i < len(beaconState.ValidatorRegistry); i++ {
-		pubKey := bytesutil.ToBytes48(beaconState.ValidatorRegistry[i].Pubkey)
-		attsService.InsertAttestationIntoStore(pubKey, &pb.Attestation{
-			Data: &pb.AttestationData{
-				BeaconBlockRootHash32: blockRoot[:],
-			}},
-		)
-	}
-	if err := chainService.ApplyForkChoiceRule(context.Background(), block, computedState); err != nil {
-		t.Fatal(err)
-	}
-
-	if len(db.PendingDeposits(chainService.ctx, nil)) != 0 {
-		t.Fatalf("Expected 0 pending deposits, but there are %+v", db.PendingDeposits(chainService.ctx, nil))
-	}
-	testutil.AssertLogsContain(t, hook, "Executing state transition")
-}
-
-// Scenario graph: http://bit.ly/2K1k2KZ
-//
-//digraph G {
-//    rankdir=LR;
-//    node [shape="none"];
-//
-//    subgraph blocks {
-//        rankdir=LR;
-//        node [shape="box"];
-//        a->b;
-//        b->c;
-//        c->e;
-//        c->f;
-//        f->g;
-//        e->h;
-//    }
-//
-//    { rank=same; 1; a;}
-//    { rank=same; 2; b;}
-//    { rank=same; 3; c;}
-//    { rank=same; 5; e;}
-//    { rank=same; 6; f;}
-//    { rank=same; 7; g;}
-//    { rank=same; 8; h;}
-//
-//    1->2->3->4->5->6->7->8->9[arrowhead=none];
-//}
-func TestReceiveBlock_OnChainSplit(t *testing.T) {
-	// The scenario to test is that we think that the canonical head is block H
-	// and then we receive block G. We don't have block F, so we request it. Then
-	// we process F, the G. The expected behavior is that we load the historical
-	// state from slot 3 where the common ancestor block C is present.
-
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	ctx := context.Background()
-
-	chainService := setupBeaconChain(t, db, nil)
-	deposits, privKeys := setupInitialDeposits(t, 100)
-	eth1Data := &pb.Eth1Data{
-		DepositRootHash32: []byte{},
-		BlockHash32:       []byte{},
-	}
-	beaconState, err := state.GenesisBeaconState(deposits, 0, eth1Data)
-	if err != nil {
-		t.Fatalf("Can't generate genesis state: %v", err)
-	}
-	stateRoot, err := hashutil.HashProto(beaconState)
-	if err != nil {
-		t.Fatalf("Could not tree hash state: %v", err)
-	}
-	parentHash, genesisBlock := setupGenesisBlock(t, chainService)
-	if err := db.UpdateChainHead(ctx, genesisBlock, beaconState); err != nil {
-		t.Fatal(err)
-	}
-	if err := db.SaveFinalizedState(beaconState); err != nil {
-		t.Fatal(err)
-	}
-	genesisSlot := params.BeaconConfig().GenesisSlot
-
-	// Top chain slots (see graph)
-	blockSlots := []uint64{1, 2, 3, 5, 8}
-	for _, slot := range blockSlots {
-		block := &pb.BeaconBlock{
-			Slot:             genesisSlot + slot,
-			StateRootHash32:  stateRoot[:],
-			ParentRootHash32: parentHash[:],
-			RandaoReveal:     createRandaoReveal(t, beaconState, privKeys),
-			Body:             &pb.BeaconBlockBody{},
-		}
-		initBlockStateRoot(t, block, chainService)
-		computedState, err := chainService.ReceiveBlock(ctx, block)
-		if err != nil {
-			t.Fatal(err)
-		}
-		stateRoot, err = hashutil.HashProto(computedState)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if err = db.SaveBlock(block); err != nil {
-			t.Fatal(err)
-		}
-		if err = db.UpdateChainHead(ctx, block, computedState); err != nil {
-			t.Fatal(err)
-		}
-		parentHash, err = hashutil.HashBeaconBlock(block)
-		if err != nil {
-			t.Fatal(err)
-		}
-	}
-
-	// Common ancestor is block at slot 3
-	commonAncestor, err := db.BlockBySlot(ctx, genesisSlot+3)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	parentHash, err = hashutil.HashBeaconBlock(commonAncestor)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	beaconState, err = db.HistoricalStateFromSlot(ctx, commonAncestor.Slot)
-	if err != nil {
-		t.Fatal(err)
-	}
-	stateRoot, err = hashutil.HashProto(beaconState)
-	if err != nil {
-		t.Fatal(err)
-	}
-	// Then we receive the block `f` from slot 6
-	blockF := &pb.BeaconBlock{
-		Slot:             genesisSlot + 6,
-		ParentRootHash32: parentHash[:],
-		StateRootHash32:  stateRoot[:],
-		RandaoReveal:     createRandaoReveal(t, beaconState, privKeys),
-		Body:             &pb.BeaconBlockBody{},
-	}
-	initBlockStateRoot(t, blockF, chainService)
-
-	computedState, err := chainService.ReceiveBlock(ctx, blockF)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	stateRoot, err = hashutil.HashProto(computedState)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if err := db.SaveBlock(blockF); err != nil {
-		t.Fatal(err)
-	}
-
-	parentHash, err = hashutil.HashBeaconBlock(blockF)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// Then we apply block `g` from slot 7
-	blockG := &pb.BeaconBlock{
-		Slot:             genesisSlot + 7,
-		ParentRootHash32: parentHash[:],
-		StateRootHash32:  stateRoot[:],
-		RandaoReveal:     createRandaoReveal(t, computedState, privKeys),
-		Body:             &pb.BeaconBlockBody{},
-	}
-	initBlockStateRoot(t, blockG, chainService)
-
-	computedState, err = chainService.ReceiveBlock(ctx, blockG)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if computedState.Slot != blockG.Slot {
-		t.Errorf("Unexpect state slot %d, wanted %d", computedState.Slot, blockG.Slot)
-	}
-}
-
-func TestIsBlockReadyForProcessing_ValidBlock(t *testing.T) {
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	ctx := context.Background()
-
-	chainService := setupBeaconChain(t, db, nil)
-	unixTime := uint64(time.Now().Unix())
-	deposits, privKeys := setupInitialDeposits(t, 100)
-	if err := db.InitializeState(context.Background(), unixTime, deposits, &pb.Eth1Data{}); err != nil {
-		t.Fatalf("Could not initialize beacon state to disk: %v", err)
-	}
-	beaconState, err := db.HeadState(ctx)
-	if err != nil {
-		t.Fatalf("Can't get genesis state: %v", err)
-	}
-	block := &pb.BeaconBlock{
-		ParentRootHash32: []byte{'a'},
-	}
-
-	if err := chainService.VerifyBlockValidity(ctx, block, beaconState); err == nil {
-		t.Fatal("block processing succeeded despite block having no parent saved")
-	}
-
-	beaconState.Slot = params.BeaconConfig().GenesisSlot + 10
-
-	stateRoot, err := hashutil.HashProto(beaconState)
-	if err != nil {
-		t.Fatalf("Could not tree hash state: %v", err)
-	}
-	genesis := b.NewGenesisBlock([]byte{})
-	if err := chainService.beaconDB.SaveBlock(genesis); err != nil {
-		t.Fatalf("cannot save block: %v", err)
-	}
-	parentRoot, err := hashutil.HashBeaconBlock(genesis)
-	if err != nil {
-		t.Fatalf("unable to get root of canonical head: %v", err)
-	}
-
-	beaconState.LatestEth1Data = &pb.Eth1Data{
-		DepositRootHash32: []byte{2},
-		BlockHash32:       []byte{3},
-	}
-	beaconState.Slot = params.BeaconConfig().GenesisSlot
-
-	currentSlot := params.BeaconConfig().GenesisSlot + 1
-	attestationSlot := params.BeaconConfig().GenesisSlot
-
-	randaoReveal := createRandaoReveal(t, beaconState, privKeys)
-	block2 := &pb.BeaconBlock{
-		Slot:             currentSlot,
-		StateRootHash32:  stateRoot[:],
-		ParentRootHash32: parentRoot[:],
-		RandaoReveal:     randaoReveal,
-		Eth1Data: &pb.Eth1Data{
-			DepositRootHash32: []byte("a"),
-			BlockHash32:       []byte("b"),
-		},
-		Body: &pb.BeaconBlockBody{
-			Attestations: []*pb.Attestation{{
-				AggregationBitfield: []byte{128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-					0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
-				Data: &pb.AttestationData{
-					Slot:                     attestationSlot,
-					JustifiedBlockRootHash32: parentRoot[:],
-				},
-			}},
-		},
-	}
-
-	if err := chainService.VerifyBlockValidity(ctx, block2, beaconState); err != nil {
-		t.Fatalf("block processing failed despite being a valid block: %v", err)
-	}
-}
-
-func TestDeleteValidatorIdx_DeleteWorks(t *testing.T) {
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	epoch := uint64(2)
-	v.InsertActivatedVal(epoch+1, []uint64{0, 1, 2})
-	v.InsertExitedVal(epoch+1, []uint64{0, 2})
-	var validators []*pb.Validator
-	for i := 0; i < 3; i++ {
-		pubKeyBuf := make([]byte, params.BeaconConfig().BLSPubkeyLength)
-		binary.PutUvarint(pubKeyBuf, uint64(i))
-		validators = append(validators, &pb.Validator{
-			Pubkey: pubKeyBuf,
-		})
-	}
-	state := &pb.BeaconState{
-		ValidatorRegistry: validators,
-		Slot:              epoch * params.BeaconConfig().SlotsPerEpoch,
-	}
-	chainService := setupBeaconChain(t, db, nil)
-	if err := chainService.saveValidatorIdx(state); err != nil {
-		t.Fatalf("Could not save validator idx: %v", err)
-	}
-	if err := chainService.deleteValidatorIdx(state); err != nil {
-		t.Fatalf("Could not delete validator idx: %v", err)
-	}
-	wantedIdx := uint64(1)
-	idx, err := chainService.beaconDB.ValidatorIndex(validators[wantedIdx].Pubkey)
-	if err != nil {
-		t.Fatalf("Could not get validator index: %v", err)
-	}
-	if wantedIdx != idx {
-		t.Errorf("Wanted: %d, got: %d", wantedIdx, idx)
-	}
-
-	wantedIdx = uint64(2)
-	if chainService.beaconDB.HasValidator(validators[wantedIdx].Pubkey) {
-		t.Errorf("Validator index %d should have been deleted", wantedIdx)
-	}
-	if v.ExitedValFromEpoch(epoch) != nil {
-		t.Errorf("Activated validators mapping for epoch %d still there", epoch)
-	}
-}
-
-func TestSaveValidatorIdx_SaveRetrieveWorks(t *testing.T) {
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	epoch := uint64(1)
-	v.InsertActivatedVal(epoch+1, []uint64{0, 1, 2})
-	var validators []*pb.Validator
-	for i := 0; i < 3; i++ {
-		pubKeyBuf := make([]byte, params.BeaconConfig().BLSPubkeyLength)
-		binary.PutUvarint(pubKeyBuf, uint64(i))
-		validators = append(validators, &pb.Validator{
-			Pubkey: pubKeyBuf,
-		})
-	}
-	state := &pb.BeaconState{
-		ValidatorRegistry: validators,
-		Slot:              epoch * params.BeaconConfig().SlotsPerEpoch,
-	}
-	chainService := setupBeaconChain(t, db, nil)
-	if err := chainService.saveValidatorIdx(state); err != nil {
-		t.Fatalf("Could not save validator idx: %v", err)
-	}
-
-	wantedIdx := uint64(2)
-	idx, err := chainService.beaconDB.ValidatorIndex(validators[wantedIdx].Pubkey)
-	if err != nil {
-		t.Fatalf("Could not get validator index: %v", err)
-	}
-	if wantedIdx != idx {
-		t.Errorf("Wanted: %d, got: %d", wantedIdx, idx)
-	}
-
-	if v.ActivatedValFromEpoch(epoch) != nil {
-		t.Errorf("Activated validators mapping for epoch %d still there", epoch)
-	}
-}

beacon-chain/blockchain/chain_info.go

@@ -0,0 +1,248 @@
+package blockchain
+
+import (
+	"context"
+	"time"
+
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stateutil"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"go.opencensus.io/trace"
+)
+
+// ChainInfoFetcher defines a common interface for methods in blockchain service which
+// directly retrieves chain info related data.
+type ChainInfoFetcher interface {
+	HeadFetcher
+	FinalizationFetcher
+	GenesisFetcher
+	CanonicalFetcher
+}
+
+// TimeFetcher retrieves the Eth2 data that's related to time.
+type TimeFetcher interface {
+	GenesisTime() time.Time
+	CurrentSlot() uint64
+}
+
+// GenesisFetcher retrieves the eth2 data related to its genesis.
+type GenesisFetcher interface {
+	GenesisValidatorRoot() [32]byte
+}
+
+// HeadFetcher defines a common interface for methods in blockchain service which
+// directly retrieves head related data.
+type HeadFetcher interface {
+	HeadSlot() uint64
+	HeadRoot(ctx context.Context) ([]byte, error)
+	HeadBlock(ctx context.Context) (*ethpb.SignedBeaconBlock, error)
+	HeadState(ctx context.Context) (*state.BeaconState, error)
+	HeadValidatorsIndices(ctx context.Context, epoch uint64) ([]uint64, error)
+	HeadSeed(ctx context.Context, epoch uint64) ([32]byte, error)
+	HeadGenesisValidatorRoot() [32]byte
+	HeadETH1Data() *ethpb.Eth1Data
+	ProtoArrayStore() *protoarray.Store
+}
+
+// ForkFetcher retrieves the current fork information of the Ethereum beacon chain.
+type ForkFetcher interface {
+	CurrentFork() *pb.Fork
+}
+
+// CanonicalFetcher retrieves the current chain's canonical information.
+type CanonicalFetcher interface {
+	IsCanonical(ctx context.Context, blockRoot [32]byte) (bool, error)
+}
+
+// FinalizationFetcher defines a common interface for methods in blockchain service which
+// directly retrieves finalization and justification related data.
+type FinalizationFetcher interface {
+	FinalizedCheckpt() *ethpb.Checkpoint
+	CurrentJustifiedCheckpt() *ethpb.Checkpoint
+	PreviousJustifiedCheckpt() *ethpb.Checkpoint
+}
+
+// ParticipationFetcher defines a common interface for methods in blockchain service which
+// directly retrieves validator participation related data.
+type ParticipationFetcher interface {
+	Participation(epoch uint64) *precompute.Balance
+}
+
+// FinalizedCheckpt returns the latest finalized checkpoint from head state.
+func (s *Service) FinalizedCheckpt() *ethpb.Checkpoint {
+	if s.finalizedCheckpt == nil {
+		return &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
+	}
+
+	return state.CopyCheckpoint(s.finalizedCheckpt)
+}
+
+// CurrentJustifiedCheckpt returns the current justified checkpoint from head state.
+func (s *Service) CurrentJustifiedCheckpt() *ethpb.Checkpoint {
+	if s.justifiedCheckpt == nil {
+		return &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
+	}
+
+	return state.CopyCheckpoint(s.justifiedCheckpt)
+}
+
+// PreviousJustifiedCheckpt returns the previous justified checkpoint from head state.
+func (s *Service) PreviousJustifiedCheckpt() *ethpb.Checkpoint {
+	if s.prevJustifiedCheckpt == nil {
+		return &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
+	}
+
+	return state.CopyCheckpoint(s.prevJustifiedCheckpt)
+}
+
+// HeadSlot returns the slot of the head of the chain.
+func (s *Service) HeadSlot() uint64 {
+	if !s.hasHeadState() {
+		return 0
+	}
+
+	return s.headSlot()
+}
+
+// HeadRoot returns the root of the head of the chain.
+func (s *Service) HeadRoot(ctx context.Context) ([]byte, error) {
+	if s.headRoot() != params.BeaconConfig().ZeroHash {
+		r := s.headRoot()
+		return r[:], nil
+	}
+
+	b, err := s.beaconDB.HeadBlock(ctx)
+	if err != nil {
+		return nil, err
+	}
+	if b == nil {
+		return params.BeaconConfig().ZeroHash[:], nil
+	}
+
+	r, err := stateutil.BlockRoot(b.Block)
+	if err != nil {
+		return nil, err
+	}
+
+	return r[:], nil
+}
+
+// HeadBlock returns the head block of the chain.
+// If the head is nil from service struct,
+// it will attempt to get the head block from DB.
+func (s *Service) HeadBlock(ctx context.Context) (*ethpb.SignedBeaconBlock, error) {
+	if s.hasHeadState() {
+		return s.headBlock(), nil
+	}
+
+	return s.beaconDB.HeadBlock(ctx)
+}
+
+// HeadState returns the head state of the chain.
+// If the head is nil from service struct,
+// it will attempt to get the head state from DB.
+func (s *Service) HeadState(ctx context.Context) (*state.BeaconState, error) {
+	ctx, span := trace.StartSpan(ctx, "blockchain.HeadState")
+	defer span.End()
+
+	ok := s.hasHeadState()
+	span.AddAttributes(trace.BoolAttribute("cache_hit", ok))
+
+	if ok {
+		return s.headState(ctx), nil
+	}
+
+	return s.beaconDB.HeadState(ctx)
+}
+
+// HeadValidatorsIndices returns a list of active validator indices from the head view of a given epoch.
+func (s *Service) HeadValidatorsIndices(ctx context.Context, epoch uint64) ([]uint64, error) {
+	if !s.hasHeadState() {
+		return []uint64{}, nil
+	}
+	return helpers.ActiveValidatorIndices(s.headState(ctx), epoch)
+}
+
+// HeadSeed returns the seed from the head view of a given epoch.
+func (s *Service) HeadSeed(ctx context.Context, epoch uint64) ([32]byte, error) {
+	if !s.hasHeadState() {
+		return [32]byte{}, nil
+	}
+
+	return helpers.Seed(s.headState(ctx), epoch, params.BeaconConfig().DomainBeaconAttester)
+}
+
+// HeadGenesisValidatorRoot returns genesis validator root of the head state.
+func (s *Service) HeadGenesisValidatorRoot() [32]byte {
+	if !s.hasHeadState() {
+		return [32]byte{}
+	}
+
+	return s.headGenesisValidatorRoot()
+}
+
+// HeadETH1Data returns the eth1data of the current head state.
+func (s *Service) HeadETH1Data() *ethpb.Eth1Data {
+	if !s.hasHeadState() {
+		return &ethpb.Eth1Data{}
+	}
+	return s.head.state.Eth1Data()
+}
+
+// ProtoArrayStore returns the proto array store object.
+func (s *Service) ProtoArrayStore() *protoarray.Store {
+	return s.forkChoiceStore.Store()
+}
+
+// GenesisTime returns the genesis time of beacon chain.
+func (s *Service) GenesisTime() time.Time {
+	return s.genesisTime
+}
+
+// GenesisValidatorRoot returns the genesis validator
+// root of the chain.
+func (s *Service) GenesisValidatorRoot() [32]byte {
+	if !s.hasHeadState() {
+		return [32]byte{}
+	}
+	return bytesutil.ToBytes32(s.head.state.GenesisValidatorRoot())
+}
+
+// CurrentFork retrieves the latest fork information of the beacon chain.
+func (s *Service) CurrentFork() *pb.Fork {
+	if !s.hasHeadState() {
+		return &pb.Fork{
+			PreviousVersion: params.BeaconConfig().GenesisForkVersion,
+			CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
+		}
+	}
+	return s.head.state.Fork()
+}
+
+// Participation returns the participation stats of a given epoch.
+func (s *Service) Participation(epoch uint64) *precompute.Balance {
+	s.epochParticipationLock.RLock()
+	defer s.epochParticipationLock.RUnlock()
+
+	return s.epochParticipation[epoch]
+}
+
+// IsCanonical returns true if the input block root is part of the canonical chain.
+func (s *Service) IsCanonical(ctx context.Context, blockRoot [32]byte) (bool, error) {
+	// If the block has been finalized, the block will always be part of the canonical chain.
+	if s.beaconDB.IsFinalizedBlock(ctx, blockRoot) {
+		return true, nil
+	}
+
+	// If the block has not been finalized, the block must be recent. Check recent canonical roots
+	// mapping which uses proto array fork choice.
+	s.recentCanonicalBlocksLock.RLock()
+	defer s.recentCanonicalBlocksLock.RUnlock()
+	return s.recentCanonicalBlocks[blockRoot], nil
+}

beacon-chain/blockchain/chain_info_norace_test.go

@@ -0,0 +1,73 @@
+package blockchain
+
+import (
+	"context"
+	"testing"
+
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
+)
+
+func TestHeadSlot_DataRace(t *testing.T) {
+	db, _ := testDB.SetupDB(t)
+	s := &Service{
+		beaconDB: db,
+	}
+	go func() {
+		if err := s.saveHead(context.Background(), [32]byte{}); err != nil {
+			t.Fatal(err)
+		}
+	}()
+	s.HeadSlot()
+}
+
+func TestHeadRoot_DataRace(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	s := &Service{
+		beaconDB: db,
+		head:     &head{root: [32]byte{'A'}},
+		stateGen: stategen.New(db, sc),
+	}
+	go func() {
+		if err := s.saveHead(context.Background(), [32]byte{}); err != nil {
+			t.Fatal(err)
+		}
+	}()
+	if _, err := s.HeadRoot(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestHeadBlock_DataRace(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	s := &Service{
+		beaconDB: db,
+		head:     &head{block: &ethpb.SignedBeaconBlock{}},
+		stateGen: stategen.New(db, sc),
+	}
+	go func() {
+		if err := s.saveHead(context.Background(), [32]byte{}); err != nil {
+			t.Fatal(err)
+		}
+	}()
+	if _, err := s.HeadBlock(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestHeadState_DataRace(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	s := &Service{
+		beaconDB: db,
+		stateGen: stategen.New(db, sc),
+	}
+	go func() {
+		if err := s.saveHead(context.Background(), [32]byte{}); err != nil {
+			t.Fatal(err)
+		}
+	}()
+	if _, err := s.HeadState(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+}

beacon-chain/blockchain/chain_info_test.go

@@ -0,0 +1,233 @@
+package blockchain
+
+import (
+	"bytes"
+	"context"
+	"reflect"
+	"testing"
+	"time"
+
+	"github.com/gogo/protobuf/proto"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+	"github.com/prysmaticlabs/prysm/shared/params"
+)
+
+// Ensure Service implements chain info interface.
+var _ = ChainInfoFetcher(&Service{})
+var _ = TimeFetcher(&Service{})
+var _ = ForkFetcher(&Service{})
+
+func TestFinalizedCheckpt_Nil(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	c := setupBeaconChain(t, db, sc)
+	if !bytes.Equal(c.FinalizedCheckpt().Root, params.BeaconConfig().ZeroHash[:]) {
+		t.Error("Incorrect pre chain start value")
+	}
+}
+
+func TestHeadRoot_Nil(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	c := setupBeaconChain(t, db, sc)
+	headRoot, err := c.HeadRoot(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(headRoot, params.BeaconConfig().ZeroHash[:]) {
+		t.Error("Incorrect pre chain start value")
+	}
+}
+
+func TestFinalizedCheckpt_CanRetrieve(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+
+	cp := &ethpb.Checkpoint{Epoch: 5, Root: []byte("foo")}
+	c := setupBeaconChain(t, db, sc)
+	c.finalizedCheckpt = cp
+
+	if c.FinalizedCheckpt().Epoch != cp.Epoch {
+		t.Errorf("Finalized epoch at genesis should be %d, got: %d", cp.Epoch, c.FinalizedCheckpt().Epoch)
+	}
+}
+
+func TestFinalizedCheckpt_GenesisRootOk(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+
+	genesisRoot := [32]byte{'A'}
+	cp := &ethpb.Checkpoint{Root: genesisRoot[:]}
+	c := setupBeaconChain(t, db, sc)
+	c.finalizedCheckpt = cp
+	c.genesisRoot = genesisRoot
+
+	if !bytes.Equal(c.FinalizedCheckpt().Root, c.genesisRoot[:]) {
+		t.Errorf("Got: %v, wanted: %v", c.FinalizedCheckpt().Root, c.genesisRoot[:])
+	}
+}
+
+func TestCurrentJustifiedCheckpt_CanRetrieve(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+
+	cp := &ethpb.Checkpoint{Epoch: 6, Root: []byte("foo")}
+	c := setupBeaconChain(t, db, sc)
+	c.justifiedCheckpt = cp
+
+	if c.CurrentJustifiedCheckpt().Epoch != cp.Epoch {
+		t.Errorf("Current Justifiied epoch at genesis should be %d, got: %d", cp.Epoch, c.CurrentJustifiedCheckpt().Epoch)
+	}
+}
+
+func TestJustifiedCheckpt_GenesisRootOk(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+
+	genesisRoot := [32]byte{'B'}
+	cp := &ethpb.Checkpoint{Root: genesisRoot[:]}
+	c := setupBeaconChain(t, db, sc)
+	c.justifiedCheckpt = cp
+	c.genesisRoot = genesisRoot
+
+	if !bytes.Equal(c.CurrentJustifiedCheckpt().Root, c.genesisRoot[:]) {
+		t.Errorf("Got: %v, wanted: %v", c.CurrentJustifiedCheckpt().Root, c.genesisRoot[:])
+	}
+}
+
+func TestPreviousJustifiedCheckpt_CanRetrieve(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+
+	cp := &ethpb.Checkpoint{Epoch: 7, Root: []byte("foo")}
+	c := setupBeaconChain(t, db, sc)
+	c.prevJustifiedCheckpt = cp
+
+	if c.PreviousJustifiedCheckpt().Epoch != cp.Epoch {
+		t.Errorf("Previous Justifiied epoch at genesis should be %d, got: %d", cp.Epoch, c.PreviousJustifiedCheckpt().Epoch)
+	}
+}
+
+func TestPrevJustifiedCheckpt_GenesisRootOk(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+
+	genesisRoot := [32]byte{'C'}
+	cp := &ethpb.Checkpoint{Root: genesisRoot[:]}
+	c := setupBeaconChain(t, db, sc)
+	c.prevJustifiedCheckpt = cp
+	c.genesisRoot = genesisRoot
+
+	if !bytes.Equal(c.PreviousJustifiedCheckpt().Root, c.genesisRoot[:]) {
+		t.Errorf("Got: %v, wanted: %v", c.PreviousJustifiedCheckpt().Root, c.genesisRoot[:])
+	}
+}
+
+func TestHeadSlot_CanRetrieve(t *testing.T) {
+	c := &Service{}
+	s, err := state.InitializeFromProto(&pb.BeaconState{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	c.head = &head{slot: 100, state: s}
+	if c.HeadSlot() != 100 {
+		t.Errorf("Wanted head slot: %d, got: %d", 100, c.HeadSlot())
+	}
+}
+
+func TestHeadRoot_CanRetrieve(t *testing.T) {
+	c := &Service{}
+	c.head = &head{root: [32]byte{'A'}}
+	if [32]byte{'A'} != c.headRoot() {
+		t.Errorf("Wanted head root: %v, got: %d", []byte{'A'}, c.headRoot())
+	}
+}
+
+func TestHeadBlock_CanRetrieve(t *testing.T) {
+	b := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 1}}
+	s, err := state.InitializeFromProto(&pb.BeaconState{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	c := &Service{}
+	c.head = &head{block: b, state: s}
+
+	recevied, err := c.HeadBlock(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !reflect.DeepEqual(b, recevied) {
+		t.Error("incorrect head block received")
+	}
+}
+
+func TestHeadState_CanRetrieve(t *testing.T) {
+	s, err := state.InitializeFromProto(&pb.BeaconState{Slot: 2, GenesisValidatorsRoot: params.BeaconConfig().ZeroHash[:]})
+	if err != nil {
+		t.Fatal(err)
+	}
+	c := &Service{}
+	c.head = &head{state: s}
+	headState, err := c.HeadState(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !proto.Equal(s.InnerStateUnsafe(), headState.InnerStateUnsafe()) {
+		t.Error("incorrect head state received")
+	}
+}
+
+func TestGenesisTime_CanRetrieve(t *testing.T) {
+	c := &Service{genesisTime: time.Unix(999, 0)}
+	wanted := time.Unix(999, 0)
+	if c.GenesisTime() != wanted {
+		t.Error("Did not get wanted genesis time")
+	}
+}
+
+func TestCurrentFork_CanRetrieve(t *testing.T) {
+	f := &pb.Fork{Epoch: 999}
+	s, err := state.InitializeFromProto(&pb.BeaconState{Fork: f})
+	if err != nil {
+		t.Fatal(err)
+	}
+	c := &Service{}
+	c.head = &head{state: s}
+	if !proto.Equal(c.CurrentFork(), f) {
+		t.Error("Received incorrect fork version")
+	}
+}
+
+func TestGenesisValidatorRoot_CanRetrieve(t *testing.T) {
+	// Should not panic if head state is nil.
+	c := &Service{}
+	if c.GenesisValidatorRoot() != [32]byte{} {
+		t.Error("Did not get correct genesis validator root")
+	}
+
+	s, err := state.InitializeFromProto(&pb.BeaconState{GenesisValidatorsRoot: []byte{'a'}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	c.head = &head{state: s}
+	if c.GenesisValidatorRoot() != [32]byte{'a'} {
+		t.Error("Did not get correct genesis validator root")
+	}
+}
+
+func TestHeadETH1Data_Nil(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	c := setupBeaconChain(t, db, sc)
+	if !reflect.DeepEqual(c.HeadETH1Data(), &ethpb.Eth1Data{}) {
+		t.Error("Incorrect pre chain start value")
+	}
+}
+
+func TestHeadETH1Data_CanRetrieve(t *testing.T) {
+	d := &ethpb.Eth1Data{DepositCount: 999}
+	s, err := state.InitializeFromProto(&pb.BeaconState{Eth1Data: d})
+	if err != nil {
+		t.Fatal(err)
+	}
+	c := &Service{}
+	c.head = &head{state: s}
+	if !proto.Equal(c.HeadETH1Data(), d) {
+		t.Error("Received incorrect eth1 data")
+	}
+}

beacon-chain/blockchain/fork_choice.go

@@ -1,470 +0,0 @@
-package blockchain
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
-	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
-	"github.com/prysmaticlabs/prysm/beacon-chain/db"
-	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	"github.com/prysmaticlabs/prysm/shared/bytesutil"
-	"github.com/prysmaticlabs/prysm/shared/hashutil"
-	"github.com/prysmaticlabs/prysm/shared/params"
-	"github.com/sirupsen/logrus"
-	"go.opencensus.io/trace"
-)
-
-var (
-	reorgCount = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "reorg_counter",
-		Help: "The number of chain reorganization events that have happened in the fork choice rule",
-	})
-)
-var blkAncestorCache = cache.NewBlockAncestorCache()
-
-// ForkChoice interface defines the methods for applying fork choice rule
-// operations to the blockchain.
-type ForkChoice interface {
-	ApplyForkChoiceRule(ctx context.Context, block *pb.BeaconBlock, computedState *pb.BeaconState) error
-}
-
-// updateFFGCheckPts checks whether the existing FFG check points saved in DB
-// are not older than the ones just processed in state. If it's older, we update
-// the db with the latest FFG check points, both justification and finalization.
-func (c *ChainService) updateFFGCheckPts(ctx context.Context, state *pb.BeaconState) error {
-	lastJustifiedSlot := helpers.StartSlot(state.JustifiedEpoch)
-	savedJustifiedBlock, err := c.beaconDB.JustifiedBlock()
-	if err != nil {
-		return err
-	}
-	// If the last processed justification slot in state is greater than
-	// the slot of justified block saved in DB.
-	if lastJustifiedSlot > savedJustifiedBlock.Slot {
-		// Retrieve the new justified block from DB using the new justified slot and save it.
-		newJustifiedBlock, err := c.beaconDB.BlockBySlot(ctx, lastJustifiedSlot)
-		if err != nil {
-			return err
-		}
-		// If the new justified slot is a skip slot in db then we keep getting it's ancestors
-		// until we can get a block.
-		lastAvailBlkSlot := lastJustifiedSlot
-		for newJustifiedBlock == nil {
-			log.WithField("slot", lastAvailBlkSlot-params.BeaconConfig().GenesisSlot).Debug("Missing block in DB, looking one slot back")
-			lastAvailBlkSlot--
-			newJustifiedBlock, err = c.beaconDB.BlockBySlot(ctx, lastAvailBlkSlot)
-			if err != nil {
-				return err
-			}
-		}
-
-		// Fetch justified state from historical states db.
-		newJustifiedState, err := c.beaconDB.HistoricalStateFromSlot(ctx, newJustifiedBlock.Slot)
-		if err != nil {
-			return err
-		}
-		if err := c.beaconDB.SaveJustifiedBlock(newJustifiedBlock); err != nil {
-			return err
-		}
-		if err := c.beaconDB.SaveJustifiedState(newJustifiedState); err != nil {
-			return err
-		}
-	}
-
-	lastFinalizedSlot := helpers.StartSlot(state.FinalizedEpoch)
-	savedFinalizedBlock, err := c.beaconDB.FinalizedBlock()
-	// If the last processed finalized slot in state is greater than
-	// the slot of finalized block saved in DB.
-	if err != nil {
-		return err
-	}
-	if lastFinalizedSlot > savedFinalizedBlock.Slot {
-		// Retrieve the new finalized block from DB using the new finalized slot and save it.
-		newFinalizedBlock, err := c.beaconDB.BlockBySlot(ctx, lastFinalizedSlot)
-		if err != nil {
-			return err
-		}
-		// If the new finalized slot is a skip slot in db then we keep getting it's ancestors
-		// until we can get a block.
-		lastAvailBlkSlot := lastFinalizedSlot
-		for newFinalizedBlock == nil {
-			log.WithField("slot", lastAvailBlkSlot-params.BeaconConfig().GenesisSlot).Debug("Missing block in DB, looking one slot back")
-			lastAvailBlkSlot--
-			newFinalizedBlock, err = c.beaconDB.BlockBySlot(ctx, lastAvailBlkSlot)
-			if err != nil {
-				return err
-			}
-		}
-
-		// Generate the new finalized state with using new finalized block and
-		// save it.
-		newFinalizedState, err := c.beaconDB.HistoricalStateFromSlot(ctx, lastFinalizedSlot)
-		if err != nil {
-			return err
-		}
-		if err := c.beaconDB.SaveFinalizedBlock(newFinalizedBlock); err != nil {
-			return err
-		}
-		if err := c.beaconDB.SaveFinalizedState(newFinalizedState); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// ApplyForkChoiceRule determines the current beacon chain head using LMD
-// GHOST as a block-vote weighted function to select a canonical head in
-// Ethereum Serenity. The inputs are the the recently processed block and its
-// associated state.
-func (c *ChainService) ApplyForkChoiceRule(
-	ctx context.Context,
-	block *pb.BeaconBlock,
-	postState *pb.BeaconState,
-) error {
-	ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.ApplyForkChoiceRule")
-	defer span.End()
-	log.Info("Applying LMD-GHOST Fork Choice Rule")
-
-	justifiedState, err := c.beaconDB.JustifiedState()
-	if err != nil {
-		return fmt.Errorf("could not retrieve justified state: %v", err)
-	}
-	attestationTargets, err := c.attestationTargets(justifiedState)
-	if err != nil {
-		return fmt.Errorf("could not retrieve attestation target: %v", err)
-	}
-	justifiedHead, err := c.beaconDB.JustifiedBlock()
-	if err != nil {
-		return fmt.Errorf("could not retrieve justified head: %v", err)
-	}
-
-	newHead, err := c.lmdGhost(ctx, justifiedHead, justifiedState, attestationTargets)
-	if err != nil {
-		return fmt.Errorf("could not run fork choice: %v", err)
-	}
-	newHeadRoot, err := hashutil.HashBeaconBlock(newHead)
-	if err != nil {
-		return fmt.Errorf("could not hash head block: %v", err)
-	}
-	c.canonicalBlocksLock.Lock()
-	defer c.canonicalBlocksLock.Unlock()
-	c.canonicalBlocks[newHead.Slot] = newHeadRoot[:]
-
-	currentHead, err := c.beaconDB.ChainHead()
-	if err != nil {
-		return fmt.Errorf("could not retrieve chain head: %v", err)
-	}
-
-	isDescendant, err := c.isDescendant(currentHead, newHead)
-	if err != nil {
-		return fmt.Errorf("could not check if block is descendant: %v", err)
-	}
-
-	newState := postState
-	if !isDescendant {
-		log.Warnf("Reorg happened, last head at slot %d, new head block at slot %d",
-			currentHead.Slot-params.BeaconConfig().GenesisSlot, newHead.Slot-params.BeaconConfig().GenesisSlot)
-
-		// Only regenerate head state if there was a reorg.
-		newState, err = c.beaconDB.HistoricalStateFromSlot(ctx, newHead.Slot)
-		if err != nil {
-			return fmt.Errorf("could not gen state: %v", err)
-		}
-
-		for revertedSlot := currentHead.Slot; revertedSlot > newHead.Slot; revertedSlot-- {
-			delete(c.canonicalBlocks, revertedSlot)
-		}
-		reorgCount.Inc()
-	}
-
-	// If we receive forked blocks.
-	if newHead.Slot != newState.Slot {
-		newState, err = c.beaconDB.HistoricalStateFromSlot(ctx, newHead.Slot)
-		if err != nil {
-			return fmt.Errorf("could not gen state: %v", err)
-		}
-	}
-
-	if err := c.beaconDB.UpdateChainHead(ctx, newHead, newState); err != nil {
-		return fmt.Errorf("failed to update chain: %v", err)
-	}
-	h, err := hashutil.HashBeaconBlock(newHead)
-	if err != nil {
-		return fmt.Errorf("could not hash head: %v", err)
-	}
-	log.WithFields(logrus.Fields{
-		"headRoot":  fmt.Sprintf("%#x", bytesutil.Trunc(h[:])),
-		"headSlot":  newHead.Slot - params.BeaconConfig().GenesisSlot,
-		"stateSlot": newState.Slot - params.BeaconConfig().GenesisSlot,
-	}).Info("Chain head block and state updated")
-
-	return nil
-}
-
-// lmdGhost applies the Latest Message Driven, Greediest Heaviest Observed Sub-Tree
-// fork-choice rule defined in the Ethereum Serenity specification for the beacon chain.
-//
-// Spec pseudocode definition:
-//	def lmd_ghost(store: Store, start_state: BeaconState, start_block: BeaconBlock) -> BeaconBlock:
-//    """
-//    Execute the LMD-GHOST algorithm to find the head ``BeaconBlock``.
-//    """
-//    validators = start_state.validator_registry
-//    active_validator_indices = get_active_validator_indices(validators, slot_to_epoch(start_state.slot))
-//    attestation_targets = [
-//        (validator_index, get_latest_attestation_target(store, validator_index))
-//        for validator_index in active_validator_indices
-//    ]
-//
-//    def get_vote_count(block: BeaconBlock) -> int:
-//        return sum(
-//            get_effective_balance(start_state.validator_balances[validator_index]) // FORK_CHOICE_BALANCE_INCREMENT
-//            for validator_index, target in attestation_targets
-//            if get_ancestor(store, target, block.slot) == block
-//        )
-//
-//    head = start_block
-//    while 1:
-//        children = get_children(store, head)
-//        if len(children) == 0:
-//            return head
-//        head = max(children, key=get_vote_count)
-func (c *ChainService) lmdGhost(
-	ctx context.Context,
-	startBlock *pb.BeaconBlock,
-	startState *pb.BeaconState,
-	voteTargets map[uint64]*pb.AttestationTarget,
-) (*pb.BeaconBlock, error) {
-	highestSlot := c.beaconDB.HighestBlockSlot()
-	head := startBlock
-	for {
-		children, err := c.blockChildren(ctx, head, highestSlot)
-		if err != nil {
-			return nil, fmt.Errorf("could not fetch block children: %v", err)
-		}
-		if len(children) == 0 {
-			return head, nil
-		}
-		maxChild := children[0]
-
-		maxChildVotes, err := VoteCount(maxChild, startState, voteTargets, c.beaconDB)
-		if err != nil {
-			return nil, fmt.Errorf("unable to determine vote count for block: %v", err)
-		}
-		for i := 1; i < len(children); i++ {
-			candidateChildVotes, err := VoteCount(children[i], startState, voteTargets, c.beaconDB)
-			if err != nil {
-				return nil, fmt.Errorf("unable to determine vote count for block: %v", err)
-			}
-			maxChildRoot, err := hashutil.HashBeaconBlock(maxChild)
-			if err != nil {
-				return nil, err
-			}
-			candidateChildRoot, err := hashutil.HashBeaconBlock(children[i])
-			if err != nil {
-				return nil, err
-			}
-			if candidateChildVotes > maxChildVotes ||
-				(candidateChildVotes == maxChildVotes && bytesutil.LowerThan(maxChildRoot[:], candidateChildRoot[:])) {
-				maxChild = children[i]
-			}
-		}
-		head = maxChild
-	}
-}
-
-// blockChildren returns the child blocks of the given block up to a given
-// highest slot.
-//
-// ex:
-//       /- C - E
-// A - B - D - F
-//       \- G
-// Input: B. Output: [C, D, G]
-//
-// Spec pseudocode definition:
-//	get_children(store: Store, block: BeaconBlock) -> List[BeaconBlock]
-//		returns the child blocks of the given block.
-func (c *ChainService) blockChildren(ctx context.Context, block *pb.BeaconBlock, highestSlot uint64) ([]*pb.BeaconBlock, error) {
-	var children []*pb.BeaconBlock
-
-	currentRoot, err := hashutil.HashBeaconBlock(block)
-	if err != nil {
-		return nil, fmt.Errorf("could not tree hash incoming block: %v", err)
-	}
-	startSlot := block.Slot + 1
-	for i := startSlot; i <= highestSlot; i++ {
-		block, err := c.beaconDB.BlockBySlot(ctx, i)
-		if err != nil {
-			return nil, fmt.Errorf("could not get block by slot: %v", err)
-		}
-		// Continue if there's a skip block.
-		if block == nil {
-			continue
-		}
-
-		parentRoot := bytesutil.ToBytes32(block.ParentRootHash32)
-		if currentRoot == parentRoot {
-			children = append(children, block)
-		}
-	}
-	return children, nil
-}
-
-// isDescendant checks if the new head block is a descendant block of the current head.
-func (c *ChainService) isDescendant(currentHead *pb.BeaconBlock, newHead *pb.BeaconBlock) (bool, error) {
-	currentHeadRoot, err := hashutil.HashBeaconBlock(currentHead)
-	if err != nil {
-		return false, nil
-	}
-	for newHead.Slot > currentHead.Slot {
-		if bytesutil.ToBytes32(newHead.ParentRootHash32) == currentHeadRoot {
-			return true, nil
-		}
-		newHead, err = c.beaconDB.Block(bytesutil.ToBytes32(newHead.ParentRootHash32))
-		if err != nil {
-			return false, err
-		}
-		if newHead == nil {
-			return false, nil
-		}
-	}
-	return false, nil
-}
-
-// attestationTargets retrieves the list of attestation targets since last finalized epoch,
-// each attestation target consists of validator index and its attestation target (i.e. the block
-// which the validator attested to)
-func (c *ChainService) attestationTargets(state *pb.BeaconState) (map[uint64]*pb.AttestationTarget, error) {
-	indices := helpers.ActiveValidatorIndices(state.ValidatorRegistry, helpers.CurrentEpoch(state))
-	attestationTargets := make(map[uint64]*pb.AttestationTarget)
-	for i, index := range indices {
-		target, err := c.attsService.LatestAttestationTarget(state, index)
-		if err != nil {
-			return nil, fmt.Errorf("could not retrieve attestation target: %v", err)
-		}
-		if target == nil {
-			continue
-		}
-		attestationTargets[uint64(i)] = target
-	}
-	return attestationTargets, nil
-}
-
-// VoteCount determines the number of votes on a beacon block by counting the number
-// of target blocks that have such beacon block as a common ancestor.
-//
-// Spec pseudocode definition:
-//  def get_vote_count(block: BeaconBlock) -> int:
-//        return sum(
-//            get_effective_balance(start_state.validator_balances[validator_index]) // FORK_CHOICE_BALANCE_INCREMENT
-//            for validator_index, target in attestation_targets
-//            if get_ancestor(store, target, block.slot) == block
-//        )
-func VoteCount(block *pb.BeaconBlock, state *pb.BeaconState, targets map[uint64]*pb.AttestationTarget, beaconDB *db.BeaconDB) (int, error) {
-	balances := 0
-	var ancestorRoot []byte
-	var err error
-
-	blockRoot, err := hashutil.HashBeaconBlock(block)
-	if err != nil {
-		return 0, err
-	}
-
-	for validatorIndex, target := range targets {
-		ancestorRoot, err = cachedAncestor(target, block.Slot, beaconDB)
-		if err != nil {
-			return 0, err
-		}
-		// This covers the following case, we start at B5, and want to process B6 and B7
-		// B6 can be processed, B7 can not be processed because it's pointed to the
-		// block older than current block 5.
-		// B4 - B5 - B6
-		//   \ - - - - - B7
-		if ancestorRoot == nil {
-			continue
-		}
-
-		if bytes.Equal(blockRoot[:], ancestorRoot) {
-			balances += int(helpers.EffectiveBalance(state, validatorIndex))
-		}
-	}
-	return balances, nil
-}
-
-// BlockAncestor obtains the ancestor at of a block at a certain slot.
-//
-// Spec pseudocode definition:
-//  def get_ancestor(store: Store, block: BeaconBlock, slot: Slot) -> BeaconBlock:
-//    """
-//    Get the ancestor of ``block`` with slot number ``slot``; return ``None`` if not found.
-//    """
-//    if block.slot == slot:
-//        return block
-//    elif block.slot < slot:
-//        return None
-//    else:
-//        return get_ancestor(store, store.get_parent(block), slot)
-func BlockAncestor(targetBlock *pb.AttestationTarget, slot uint64, beaconDB *db.BeaconDB) ([]byte, error) {
-	if targetBlock.Slot == slot {
-		return targetBlock.BlockRoot[:], nil
-	}
-	if targetBlock.Slot < slot {
-		return nil, nil
-	}
-	parentRoot := bytesutil.ToBytes32(targetBlock.ParentRoot)
-	parent, err := beaconDB.Block(parentRoot)
-	if err != nil {
-		return nil, fmt.Errorf("could not get parent block: %v", err)
-	}
-	if parent == nil {
-		return nil, fmt.Errorf("parent block does not exist: %v", err)
-	}
-	newTarget := &pb.AttestationTarget{
-		Slot:       parent.Slot,
-		BlockRoot:  parentRoot[:],
-		ParentRoot: parent.ParentRootHash32,
-	}
-	return BlockAncestor(newTarget, slot, beaconDB)
-}
-
-// cachedAncestor retrieves the cached ancestor target from block ancestor cache,
-// if it's not there it looks up the block tree get it and cache it.
-func cachedAncestor(target *pb.AttestationTarget, height uint64, beaconDB *db.BeaconDB) ([]byte, error) {
-	// check if the ancestor block of from a given block height was cached.
-	cachedAncestorInfo, err := blkAncestorCache.AncestorBySlot(target.BlockRoot, height)
-	if err != nil {
-		return nil, nil
-	}
-	if cachedAncestorInfo != nil {
-		return cachedAncestorInfo.Target.BlockRoot, nil
-	}
-
-	ancestorRoot, err := BlockAncestor(target, height, beaconDB)
-	if err != nil {
-		return nil, err
-	}
-	ancestor, err := beaconDB.Block(bytesutil.ToBytes32(ancestorRoot))
-	if err != nil {
-		return nil, err
-	}
-	if ancestor == nil {
-		return nil, nil
-	}
-	ancestorTarget := &pb.AttestationTarget{
-		Slot:       ancestor.Slot,
-		BlockRoot:  ancestorRoot,
-		ParentRoot: ancestor.ParentRootHash32,
-	}
-	if err := blkAncestorCache.AddBlockAncestor(&cache.AncestorInfo{
-		Height: height,
-		Hash:   target.BlockRoot,
-		Target: ancestorTarget,
-	}); err != nil {
-		return nil, err
-	}
-	return ancestorRoot, nil
-}

beacon-chain/blockchain/fork_choice_reorg_test.go

@@ -1,225 +0,0 @@
-package blockchain
-
-import (
-	"context"
-	"fmt"
-	"testing"
-
-	"github.com/gogo/protobuf/proto"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
-	"github.com/prysmaticlabs/prysm/beacon-chain/internal"
-	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	"github.com/prysmaticlabs/prysm/shared/hashutil"
-	"github.com/prysmaticlabs/prysm/shared/params"
-	"github.com/prysmaticlabs/prysm/shared/testutil"
-	logTest "github.com/sirupsen/logrus/hooks/test"
-)
-
-type mockAttestationHandler struct {
-	targets map[uint64]*pb.AttestationTarget
-}
-
-func (m *mockAttestationHandler) LatestAttestationTarget(beaconState *pb.BeaconState, idx uint64) (*pb.AttestationTarget, error) {
-	return m.targets[idx], nil
-}
-
-func (m *mockAttestationHandler) BatchUpdateLatestAttestation(ctx context.Context, atts []*pb.Attestation) error {
-	return nil
-}
-
-func TestApplyForkChoice_ChainSplitReorg(t *testing.T) {
-	hook := logTest.NewGlobal()
-	beaconDB := internal.SetupDB(t)
-	defer internal.TeardownDB(t, beaconDB)
-
-	ctx := context.Background()
-	deposits, _ := setupInitialDeposits(t, 100)
-	eth1Data := &pb.Eth1Data{
-		DepositRootHash32: []byte{},
-		BlockHash32:       []byte{},
-	}
-	justifiedState, err := state.GenesisBeaconState(deposits, 0, eth1Data)
-	if err != nil {
-		t.Fatalf("Can't generate genesis state: %v", err)
-	}
-
-	chainService := setupBeaconChain(t, beaconDB, nil)
-
-	// Construct a forked chain that looks as follows:
-	//    /------B1 ----B3 ----- B5 (current head)
-	// B0 --B2 -------------B4
-	blocks, roots := constructForkedChain(t, justifiedState)
-
-	// We then setup a canonical chain of the following blocks:
-	// B0->B1->B3->B5.
-	if err := chainService.beaconDB.SaveBlock(blocks[0]); err != nil {
-		t.Fatal(err)
-	}
-	justifiedState.LatestBlock = blocks[0]
-	if err := chainService.beaconDB.SaveJustifiedState(justifiedState); err != nil {
-		t.Fatal(err)
-	}
-	if err := chainService.beaconDB.SaveJustifiedBlock(blocks[0]); err != nil {
-		t.Fatal(err)
-	}
-	if err := chainService.beaconDB.UpdateChainHead(ctx, blocks[0], justifiedState); err != nil {
-		t.Fatal(err)
-	}
-	canonicalBlockIndices := []int{1, 3, 5}
-	postState := proto.Clone(justifiedState).(*pb.BeaconState)
-	for _, canonicalIndex := range canonicalBlockIndices {
-		postState, err = chainService.ApplyBlockStateTransition(ctx, blocks[canonicalIndex], postState)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if err := chainService.beaconDB.SaveBlock(blocks[canonicalIndex]); err != nil {
-			t.Fatal(err)
-		}
-		if err := chainService.beaconDB.UpdateChainHead(ctx, blocks[canonicalIndex], postState); err != nil {
-			t.Fatal(err)
-		}
-	}
-
-	chainHead, err := chainService.beaconDB.ChainHead()
-	if err != nil {
-		t.Fatal(err)
-	}
-	if chainHead.Slot != justifiedState.Slot+5 {
-		t.Errorf(
-			"Expected chain head with slot %d, received %d",
-			justifiedState.Slot+5-params.BeaconConfig().GenesisSlot,
-			chainHead.Slot-params.BeaconConfig().GenesisSlot,
-		)
-	}
-
-	// We then save forked blocks and their historical states (but do not update chain head).
-	// The fork is from B0->B2->B4.
-	forkedBlockIndices := []int{2, 4}
-	forkState := proto.Clone(justifiedState).(*pb.BeaconState)
-	for _, forkIndex := range forkedBlockIndices {
-		forkState, err = chainService.ApplyBlockStateTransition(ctx, blocks[forkIndex], forkState)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if err := chainService.beaconDB.SaveBlock(blocks[forkIndex]); err != nil {
-			t.Fatal(err)
-		}
-		if err := chainService.beaconDB.SaveHistoricalState(ctx, forkState); err != nil {
-			t.Fatal(err)
-		}
-	}
-
-	// Give the block from the forked chain, B4, the most votes.
-	voteTargets := make(map[uint64]*pb.AttestationTarget)
-	voteTargets[0] = &pb.AttestationTarget{
-		Slot:       blocks[5].Slot,
-		BlockRoot:  roots[5][:],
-		ParentRoot: blocks[5].ParentRootHash32,
-	}
-	for i := 1; i < len(deposits); i++ {
-		voteTargets[uint64(i)] = &pb.AttestationTarget{
-			Slot:       blocks[4].Slot,
-			BlockRoot:  roots[4][:],
-			ParentRoot: blocks[4].ParentRootHash32,
-		}
-	}
-	attHandler := &mockAttestationHandler{
-		targets: voteTargets,
-	}
-	chainService.attsService = attHandler
-
-	block4State, err := chainService.beaconDB.HistoricalStateFromSlot(ctx, blocks[4].Slot)
-	if err != nil {
-		t.Fatal(err)
-	}
-	// Applying the fork choice rule should reorg to B4 successfully.
-	if err := chainService.ApplyForkChoiceRule(ctx, blocks[4], block4State); err != nil {
-		t.Fatal(err)
-	}
-
-	newHead, err := chainService.beaconDB.ChainHead()
-	if err != nil {
-		t.Fatal(err)
-	}
-	if !proto.Equal(newHead, blocks[4]) {
-		t.Errorf(
-			"Expected chain head %v, received %v",
-			blocks[4],
-			newHead,
-		)
-	}
-	want := fmt.Sprintf(
-		"Reorg happened, last head at slot %d, new head block at slot %d",
-		blocks[5].Slot-params.BeaconConfig().GenesisSlot, blocks[4].Slot-params.BeaconConfig().GenesisSlot,
-	)
-	testutil.AssertLogsContain(t, hook, want)
-}
-
-func constructForkedChain(t *testing.T, beaconState *pb.BeaconState) ([]*pb.BeaconBlock, [][32]byte) {
-	// Construct the following chain:
-	//    /------B1 ----B3 ----- B5 (current head)
-	// B0 --B2 -------------B4
-	blocks := make([]*pb.BeaconBlock, 6)
-	roots := make([][32]byte, 6)
-	var err error
-	blocks[0] = &pb.BeaconBlock{
-		Slot:             beaconState.Slot,
-		ParentRootHash32: []byte{'A'},
-		Body:             &pb.BeaconBlockBody{},
-	}
-	roots[0], err = hashutil.HashBeaconBlock(blocks[0])
-	if err != nil {
-		t.Fatalf("Could not hash block: %v", err)
-	}
-
-	blocks[1] = &pb.BeaconBlock{
-		Slot:             beaconState.Slot + 2,
-		ParentRootHash32: roots[0][:],
-		Body:             &pb.BeaconBlockBody{},
-	}
-	roots[1], err = hashutil.HashBeaconBlock(blocks[1])
-	if err != nil {
-		t.Fatalf("Could not hash block: %v", err)
-	}
-
-	blocks[2] = &pb.BeaconBlock{
-		Slot:             beaconState.Slot + 1,
-		ParentRootHash32: roots[0][:],
-		Body:             &pb.BeaconBlockBody{},
-	}
-	roots[2], err = hashutil.HashBeaconBlock(blocks[2])
-	if err != nil {
-		t.Fatalf("Could not hash block: %v", err)
-	}
-
-	blocks[3] = &pb.BeaconBlock{
-		Slot:             beaconState.Slot + 3,
-		ParentRootHash32: roots[1][:],
-		Body:             &pb.BeaconBlockBody{},
-	}
-	roots[3], err = hashutil.HashBeaconBlock(blocks[3])
-	if err != nil {
-		t.Fatalf("Could not hash block: %v", err)
-	}
-
-	blocks[4] = &pb.BeaconBlock{
-		Slot:             beaconState.Slot + 4,
-		ParentRootHash32: roots[2][:],
-		Body:             &pb.BeaconBlockBody{},
-	}
-	roots[4], err = hashutil.HashBeaconBlock(blocks[4])
-	if err != nil {
-		t.Fatalf("Could not hash block: %v", err)
-	}
-
-	blocks[5] = &pb.BeaconBlock{
-		Slot:             beaconState.Slot + 5,
-		ParentRootHash32: roots[3][:],
-		Body:             &pb.BeaconBlockBody{},
-	}
-	roots[5], err = hashutil.HashBeaconBlock(blocks[5])
-	if err != nil {
-		t.Fatalf("Could not hash block: %v", err)
-	}
-	return blocks, roots
-}

beacon-chain/blockchain/head.go

@@ -0,0 +1,300 @@
+package blockchain
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/pkg/errors"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
+	statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
+)
+
+// This defines the current chain service's view of head.
+type head struct {
+	slot  uint64                   // current head slot.
+	root  [32]byte                 // current head root.
+	block *ethpb.SignedBeaconBlock // current head block.
+	state *state.BeaconState       // current head state.
+}
+
+// Determined the head from the fork choice service and saves its new data
+// (head root, head block, and head state) to the local service cache.
+func (s *Service) updateHead(ctx context.Context, balances []uint64) error {
+	ctx, span := trace.StartSpan(ctx, "blockchain.updateHead")
+	defer span.End()
+
+	// To get the proper head update, a node first checks its best justified
+	// can become justified. This is designed to prevent bounce attack and
+	// ensure head gets its best justified info.
+	if s.bestJustifiedCheckpt.Epoch > s.justifiedCheckpt.Epoch {
+		s.justifiedCheckpt = s.bestJustifiedCheckpt
+		if err := s.cacheJustifiedStateBalances(ctx, bytesutil.ToBytes32(s.justifiedCheckpt.Root)); err != nil {
+			return err
+		}
+	}
+
+	// Get head from the fork choice service.
+	f := s.finalizedCheckpt
+	j := s.justifiedCheckpt
+	// To get head before the first justified epoch, the fork choice will start with genesis root
+	// instead of zero hashes.
+	headStartRoot := bytesutil.ToBytes32(j.Root)
+	if headStartRoot == params.BeaconConfig().ZeroHash {
+		headStartRoot = s.genesisRoot
+	}
+	headRoot, err := s.forkChoiceStore.Head(ctx, j.Epoch, headStartRoot, balances, f.Epoch)
+	if err != nil {
+		return err
+	}
+
+	if err := s.updateRecentCanonicalBlocks(ctx, headRoot); err != nil {
+		return err
+	}
+
+	// Save head to the local service cache.
+	return s.saveHead(ctx, headRoot)
+}
+
+// This saves head info to the local service cache, it also saves the
+// new head root to the DB.
+func (s *Service) saveHead(ctx context.Context, headRoot [32]byte) error {
+	ctx, span := trace.StartSpan(ctx, "blockchain.saveHead")
+	defer span.End()
+
+	// Do nothing if head hasn't changed.
+	if headRoot == s.headRoot() {
+		return nil
+	}
+
+	// If the head state is not available, just return nil.
+	// There's nothing to cache
+	if !s.stateGen.StateSummaryExists(ctx, headRoot) {
+		return nil
+	}
+
+	// Get the new head block from DB.
+	newHeadBlock, err := s.beaconDB.Block(ctx, headRoot)
+	if err != nil {
+		return err
+	}
+	if newHeadBlock == nil || newHeadBlock.Block == nil {
+		return errors.New("cannot save nil head block")
+	}
+
+	// Get the new head state from cached state or DB.
+	newHeadState, err := s.stateGen.StateByRoot(ctx, headRoot)
+	if err != nil {
+		return errors.Wrap(err, "could not retrieve head state in DB")
+	}
+	if newHeadState == nil {
+		return errors.New("cannot save nil head state")
+	}
+
+	// A chain re-org occurred, so we fire an event notifying the rest of the services.
+	if bytesutil.ToBytes32(newHeadBlock.Block.ParentRoot) != s.headRoot() {
+		log.WithFields(logrus.Fields{
+			"newSlot": fmt.Sprintf("%d", newHeadBlock.Block.Slot),
+			"oldSlot": fmt.Sprintf("%d", s.headSlot()),
+		}).Debug("Chain reorg occurred")
+		s.stateNotifier.StateFeed().Send(&feed.Event{
+			Type: statefeed.Reorg,
+			Data: &statefeed.ReorgData{
+				NewSlot: newHeadBlock.Block.Slot,
+				OldSlot: s.headSlot(),
+			},
+		})
+
+		reorgCount.Inc()
+	}
+
+	// Cache the new head info.
+	s.setHead(headRoot, newHeadBlock, newHeadState)
+
+	// Save the new head root to DB.
+	if err := s.beaconDB.SaveHeadBlockRoot(ctx, headRoot); err != nil {
+		return errors.Wrap(err, "could not save head root in DB")
+	}
+
+	return nil
+}
+
+// This gets called to update canonical root mapping. It does not save head block
+// root in DB. With the inception of initial-sync-cache-state flag, it uses finalized
+// check point as anchors to resume sync therefore head is no longer needed to be saved on per slot basis.
+func (s *Service) saveHeadNoDB(ctx context.Context, b *ethpb.SignedBeaconBlock, r [32]byte) error {
+	if b == nil || b.Block == nil {
+		return errors.New("cannot save nil head block")
+	}
+
+	headState, err := s.stateGen.StateByRootInitialSync(ctx, r)
+	if err != nil {
+		return errors.Wrap(err, "could not retrieve head state in DB")
+	}
+	if headState == nil {
+		return errors.New("nil head state")
+	}
+
+	s.setHeadInitialSync(r, stateTrie.CopySignedBeaconBlock(b), headState)
+
+	return nil
+}
+
+// This sets head view object which is used to track the head slot, root, block and state.
+func (s *Service) setHead(root [32]byte, block *ethpb.SignedBeaconBlock, state *state.BeaconState) {
+	s.headLock.Lock()
+	defer s.headLock.Unlock()
+
+	// This does a full copy of the block and state.
+	s.head = &head{
+		slot:  block.Block.Slot,
+		root:  root,
+		block: stateTrie.CopySignedBeaconBlock(block),
+		state: state.Copy(),
+	}
+}
+
+// This sets head view object which is used to track the head slot, root, block and state. The method
+// assumes that state being passed into the method will not be modified by any other alternate
+// caller which holds the state's reference.
+func (s *Service) setHeadInitialSync(root [32]byte, block *ethpb.SignedBeaconBlock, state *state.BeaconState) {
+	s.headLock.Lock()
+	defer s.headLock.Unlock()
+
+	// This does a full copy of the block only.
+	s.head = &head{
+		slot:  block.Block.Slot,
+		root:  root,
+		block: stateTrie.CopySignedBeaconBlock(block),
+		state: state,
+	}
+}
+
+// This returns the head slot.
+func (s *Service) headSlot() uint64 {
+	s.headLock.RLock()
+	defer s.headLock.RUnlock()
+
+	return s.head.slot
+}
+
+// This returns the head root.
+// It does a full copy on head root for immutability.
+func (s *Service) headRoot() [32]byte {
+	if s.head == nil {
+		return params.BeaconConfig().ZeroHash
+	}
+
+	s.headLock.RLock()
+	defer s.headLock.RUnlock()
+
+	return s.head.root
+}
+
+// This returns the head block.
+// It does a full copy on head block for immutability.
+func (s *Service) headBlock() *ethpb.SignedBeaconBlock {
+	s.headLock.RLock()
+	defer s.headLock.RUnlock()
+
+	return stateTrie.CopySignedBeaconBlock(s.head.block)
+}
+
+// This returns the head state.
+// It does a full copy on head state for immutability.
+func (s *Service) headState(ctx context.Context) *stateTrie.BeaconState {
+	ctx, span := trace.StartSpan(ctx, "blockchain.headState")
+	defer span.End()
+
+	s.headLock.RLock()
+	defer s.headLock.RUnlock()
+
+	return s.head.state.Copy()
+}
+
+// This returns the genesis validator root of the head state.
+func (s *Service) headGenesisValidatorRoot() [32]byte {
+	s.headLock.RLock()
+	defer s.headLock.RUnlock()
+
+	return bytesutil.ToBytes32(s.head.state.GenesisValidatorRoot())
+}
+
+// Returns true if head state exists.
+func (s *Service) hasHeadState() bool {
+	s.headLock.RLock()
+	defer s.headLock.RUnlock()
+
+	return s.head != nil && s.head.state != nil
+}
+
+// This updates recent canonical block mapping. It uses input head root and retrieves
+// all the canonical block roots that are ancestor of the input head block root.
+func (s *Service) updateRecentCanonicalBlocks(ctx context.Context, headRoot [32]byte) error {
+	ctx, span := trace.StartSpan(ctx, "blockchain.updateRecentCanonicalBlocks")
+	defer span.End()
+
+	s.recentCanonicalBlocksLock.Lock()
+	defer s.recentCanonicalBlocksLock.Unlock()
+
+	s.recentCanonicalBlocks = make(map[[32]byte]bool)
+	s.recentCanonicalBlocks[headRoot] = true
+	nodes := s.forkChoiceStore.Nodes()
+	node := s.forkChoiceStore.Node(headRoot)
+	if node == nil {
+		return nil
+	}
+
+	for node.Parent != protoarray.NonExistentNode {
+		if ctx.Err() != nil {
+			return ctx.Err()
+		}
+		node = nodes[node.Parent]
+		s.recentCanonicalBlocks[node.Root] = true
+	}
+
+	return nil
+}
+
+// This caches justified state balances to be used for fork choice.
+func (s *Service) cacheJustifiedStateBalances(ctx context.Context, justifiedRoot [32]byte) error {
+	if err := s.beaconDB.SaveBlocks(ctx, s.getInitSyncBlocks()); err != nil {
+		return err
+	}
+
+	s.clearInitSyncBlocks()
+	justifiedState, err := s.stateGen.StateByRoot(ctx, justifiedRoot)
+	if err != nil {
+		return err
+	}
+
+	epoch := helpers.CurrentEpoch(justifiedState)
+	validators := justifiedState.Validators()
+	justifiedBalances := make([]uint64, len(validators))
+	for i, validator := range validators {
+		if helpers.IsActiveValidator(validator, epoch) {
+			justifiedBalances[i] = validator.EffectiveBalance
+		} else {
+			justifiedBalances[i] = 0
+		}
+	}
+
+	s.justifiedBalancesLock.Lock()
+	defer s.justifiedBalancesLock.Unlock()
+	s.justifiedBalances = justifiedBalances
+	return nil
+}
+
+func (s *Service) getJustifiedBalances() []uint64 {
+	s.justifiedBalancesLock.RLock()
+	defer s.justifiedBalancesLock.RUnlock()
+	return s.justifiedBalances
+}

beacon-chain/blockchain/head_test.go

@@ -0,0 +1,222 @@
+package blockchain
+
+import (
+	"bytes"
+	"context"
+	"reflect"
+	"testing"
+
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stateutil"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+	"github.com/prysmaticlabs/prysm/shared/testutil"
+	logTest "github.com/sirupsen/logrus/hooks/test"
+)
+
+func TestSaveHead_Same(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	service := setupBeaconChain(t, db, sc)
+
+	r := [32]byte{'A'}
+	service.head = &head{slot: 0, root: r}
+
+	if err := service.saveHead(context.Background(), r); err != nil {
+		t.Fatal(err)
+	}
+
+	if service.headSlot() != 0 {
+		t.Error("Head did not stay the same")
+	}
+
+	if service.headRoot() != r {
+		t.Error("Head did not stay the same")
+	}
+}
+
+func TestSaveHead_Different(t *testing.T) {
+	ctx := context.Background()
+	db, sc := testDB.SetupDB(t)
+	service := setupBeaconChain(t, db, sc)
+
+	oldRoot := [32]byte{'A'}
+	service.head = &head{slot: 0, root: oldRoot}
+
+	newHeadBlock := &ethpb.BeaconBlock{Slot: 1}
+	newHeadSignedBlock := &ethpb.SignedBeaconBlock{Block: newHeadBlock}
+
+	if err := service.beaconDB.SaveBlock(context.Background(), newHeadSignedBlock); err != nil {
+		t.Fatal(err)
+	}
+	newRoot, err := stateutil.BlockRoot(newHeadBlock)
+	if err != nil {
+		t.Fatal(err)
+	}
+	headState := testutil.NewBeaconState()
+	if err := headState.SetSlot(1); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveStateSummary(context.Background(), &pb.StateSummary{Slot: 1, Root: newRoot[:]}); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveState(context.Background(), headState, newRoot); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.saveHead(context.Background(), newRoot); err != nil {
+		t.Fatal(err)
+	}
+
+	if service.HeadSlot() != 1 {
+		t.Error("Head did not change")
+	}
+
+	cachedRoot, err := service.HeadRoot(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(cachedRoot, newRoot[:]) {
+		t.Error("Head did not change")
+	}
+	if !reflect.DeepEqual(service.headBlock(), newHeadSignedBlock) {
+		t.Error("Head did not change")
+	}
+	if !reflect.DeepEqual(service.headState(ctx).CloneInnerState(), headState.CloneInnerState()) {
+		t.Error("Head did not change")
+	}
+}
+
+func TestSaveHead_Different_Reorg(t *testing.T) {
+	ctx := context.Background()
+	hook := logTest.NewGlobal()
+	db, sc := testDB.SetupDB(t)
+	service := setupBeaconChain(t, db, sc)
+
+	oldRoot := [32]byte{'A'}
+	service.head = &head{slot: 0, root: oldRoot}
+
+	reorgChainParent := [32]byte{'B'}
+	newHeadBlock := &ethpb.BeaconBlock{
+		Slot:       1,
+		ParentRoot: reorgChainParent[:],
+	}
+	newHeadSignedBlock := &ethpb.SignedBeaconBlock{Block: newHeadBlock}
+
+	if err := service.beaconDB.SaveBlock(context.Background(), newHeadSignedBlock); err != nil {
+		t.Fatal(err)
+	}
+	newRoot, err := stateutil.BlockRoot(newHeadBlock)
+	if err != nil {
+		t.Fatal(err)
+	}
+	headState := testutil.NewBeaconState()
+	if err := headState.SetSlot(1); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveStateSummary(context.Background(), &pb.StateSummary{Slot: 1, Root: newRoot[:]}); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveState(context.Background(), headState, newRoot); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.saveHead(context.Background(), newRoot); err != nil {
+		t.Fatal(err)
+	}
+
+	if service.HeadSlot() != 1 {
+		t.Error("Head did not change")
+	}
+
+	cachedRoot, err := service.HeadRoot(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(cachedRoot, newRoot[:]) {
+		t.Error("Head did not change")
+	}
+	if !reflect.DeepEqual(service.headBlock(), newHeadSignedBlock) {
+		t.Error("Head did not change")
+	}
+	if !reflect.DeepEqual(service.headState(ctx).CloneInnerState(), headState.CloneInnerState()) {
+		t.Error("Head did not change")
+	}
+	testutil.AssertLogsContain(t, hook, "Chain reorg occurred")
+}
+
+func TestUpdateRecentCanonicalBlocks_CanUpdateWithoutParent(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	service := setupBeaconChain(t, db, sc)
+
+	r := [32]byte{'a'}
+	if err := service.updateRecentCanonicalBlocks(context.Background(), r); err != nil {
+		t.Fatal(err)
+	}
+	canonical, err := service.IsCanonical(context.Background(), r)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !canonical {
+		t.Error("Block should be canonical")
+	}
+}
+
+func TestUpdateRecentCanonicalBlocks_CanUpdateWithParent(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	service := setupBeaconChain(t, db, sc)
+	oldHead := [32]byte{'a'}
+	if err := service.forkChoiceStore.ProcessBlock(context.Background(), 1, oldHead, [32]byte{'g'}, [32]byte{}, 0, 0); err != nil {
+		t.Fatal(err)
+	}
+	currentHead := [32]byte{'b'}
+	if err := service.forkChoiceStore.ProcessBlock(context.Background(), 3, currentHead, oldHead, [32]byte{}, 0, 0); err != nil {
+		t.Fatal(err)
+	}
+	forkedRoot := [32]byte{'c'}
+	if err := service.forkChoiceStore.ProcessBlock(context.Background(), 2, forkedRoot, oldHead, [32]byte{}, 0, 0); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := service.updateRecentCanonicalBlocks(context.Background(), currentHead); err != nil {
+		t.Fatal(err)
+	}
+	canonical, err := service.IsCanonical(context.Background(), currentHead)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !canonical {
+		t.Error("Block should be canonical")
+	}
+	canonical, err = service.IsCanonical(context.Background(), oldHead)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !canonical {
+		t.Error("Block should be canonical")
+	}
+	canonical, err = service.IsCanonical(context.Background(), forkedRoot)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if canonical {
+		t.Error("Block should not be canonical")
+	}
+}
+
+func TestCacheJustifiedStateBalances_CanCache(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	service := setupBeaconChain(t, db, sc)
+
+	state, _ := testutil.DeterministicGenesisState(t, 100)
+	r := [32]byte{'a'}
+	if err := service.beaconDB.SaveStateSummary(context.Background(), &pb.StateSummary{Root: r[:]}); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveState(context.Background(), state, r); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.cacheJustifiedStateBalances(context.Background(), r); err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(state.Balances(), service.getJustifiedBalances()) {
+		t.Fatal("Incorrect justified balances")
+	}
+}

beacon-chain/blockchain/info.go

@@ -0,0 +1,84 @@
+package blockchain
+
+import (
+	"encoding/hex"
+	"fmt"
+	"net/http"
+
+	"github.com/emicklei/dot"
+)
+
+const template = `<html>
+<head>
+    <script src="//cdnjs.cloudflare.com/ajax/libs/viz.js/2.1.2/viz.js"></script>
+    <script src="//cdnjs.cloudflare.com/ajax/libs/viz.js/2.1.2/full.render.js"></script>
+<body>
+    <script type="application/javascript">
+        var graph = ` + "`%s`;" + `
+        var viz = new Viz();
+        viz.renderSVGElement(graph) // reading the graph.
+            .then(function(element) {
+                document.body.appendChild(element); // appends to document.
+            })
+            .catch(error => {
+                // Create a new Viz instance (@see Caveats page for more info)
+                viz = new Viz();
+                // Possibly display the error
+                console.error(error);
+            });
+    </script>
+</head>
+</body>
+</html>`
+
+// TreeHandler is a handler to serve /tree page in metrics.
+func (s *Service) TreeHandler(w http.ResponseWriter, r *http.Request) {
+	if s.headState(r.Context()) == nil {
+		if _, err := w.Write([]byte("Unavailable during initial syncing")); err != nil {
+			log.WithError(err).Error("Failed to render p2p info page")
+		}
+	}
+
+	nodes := s.forkChoiceStore.Nodes()
+
+	graph := dot.NewGraph(dot.Directed)
+	graph.Attr("rankdir", "RL")
+	graph.Attr("labeljust", "l")
+
+	dotNodes := make([]*dot.Node, len(nodes))
+	avgBalance := uint64(averageBalance(s.headState(r.Context()).Balances()))
+
+	for i := len(nodes) - 1; i >= 0; i-- {
+		// Construct label for each node.
+		slot := fmt.Sprintf("%d", nodes[i].Slot)
+		weight := fmt.Sprintf("%d", nodes[i].Weight/1e9) // Convert unit Gwei to unit ETH.
+		votes := fmt.Sprintf("%d", nodes[i].Weight/1e9/avgBalance)
+		index := fmt.Sprintf("%d", i)
+		g := nodes[i].Graffiti[:]
+		graffiti := hex.EncodeToString(g[:8])
+		label := "slot: " + slot + "\n votes: " + votes + "\n weight: " + weight + "\n graffiti: " + graffiti
+		var dotN dot.Node
+		if nodes[i].Parent != ^uint64(0) {
+			dotN = graph.Node(index).Box().Attr("label", label)
+		}
+
+		if nodes[i].Slot == s.headSlot() &&
+			nodes[i].BestDescendant == ^uint64(0) {
+			dotN = dotN.Attr("color", "green")
+		}
+
+		dotNodes[i] = &dotN
+	}
+
+	for i := len(nodes) - 1; i >= 0; i-- {
+		if nodes[i].Parent != ^uint64(0) && nodes[i].Parent < uint64(len(dotNodes)) {
+			graph.Edge(*dotNodes[i], *dotNodes[nodes[i].Parent])
+		}
+	}
+
+	w.WriteHeader(http.StatusOK)
+	w.Header().Set("Content-Type", "text/html")
+	if _, err := fmt.Fprintf(w, template, graph.String()); err != nil {
+		log.WithError(err).Error("Failed to render p2p info page")
+	}
+}

beacon-chain/blockchain/init_sync_process_block.go

@@ -0,0 +1,105 @@
+package blockchain
+
+import (
+	"context"
+
+	"github.com/pkg/errors"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+)
+
+func (s *Service) generateState(ctx context.Context, startRoot [32]byte, endRoot [32]byte) (*stateTrie.BeaconState, error) {
+	preState, err := s.beaconDB.State(ctx, startRoot)
+	if err != nil {
+		return nil, err
+	}
+	if preState == nil {
+		if !s.stateGen.HasState(ctx, startRoot) {
+			if err := s.beaconDB.SaveBlocks(ctx, s.getInitSyncBlocks()); err != nil {
+				return nil, errors.Wrap(err, "could not save initial sync blocks")
+			}
+			s.clearInitSyncBlocks()
+		}
+		preState, err = s.stateGen.StateByRoot(ctx, startRoot)
+		if err != nil {
+			return nil, err
+		}
+		if preState == nil {
+			return nil, errors.New("finalized state does not exist in db")
+		}
+	}
+
+	if err := s.beaconDB.SaveBlocks(ctx, s.getInitSyncBlocks()); err != nil {
+		return nil, err
+	}
+	var endBlock *ethpb.SignedBeaconBlock
+	if s.hasInitSyncBlock(endRoot) {
+		endBlock = s.getInitSyncBlock(endRoot)
+		s.clearInitSyncBlocks()
+	} else {
+		endBlock, err = s.beaconDB.Block(ctx, endRoot)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if endBlock == nil {
+		return nil, errors.New("provided block root does not have block saved in the db")
+	}
+	log.Warnf("Generating missing state of slot %d and root %#x", endBlock.Block.Slot, endRoot)
+
+	blocks, err := s.stateGen.LoadBlocks(ctx, preState.Slot()+1, endBlock.Block.Slot, endRoot)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not load the required blocks")
+	}
+	postState, err := s.stateGen.ReplayBlocks(ctx, preState, blocks, endBlock.Block.Slot)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not replay the blocks to generate the resultant state")
+	}
+	return postState, nil
+}
+
+// This saves a beacon block to the initial sync blocks cache.
+func (s *Service) saveInitSyncBlock(r [32]byte, b *ethpb.SignedBeaconBlock) {
+	s.initSyncBlocksLock.Lock()
+	defer s.initSyncBlocksLock.Unlock()
+	s.initSyncBlocks[r] = b
+}
+
+// This checks if a beacon block exists in the initial sync blocks cache using the root
+// of the block.
+func (s *Service) hasInitSyncBlock(r [32]byte) bool {
+	s.initSyncBlocksLock.RLock()
+	defer s.initSyncBlocksLock.RUnlock()
+	_, ok := s.initSyncBlocks[r]
+	return ok
+}
+
+// This retrieves a beacon block from the initial sync blocks cache using the root of
+// the block.
+func (s *Service) getInitSyncBlock(r [32]byte) *ethpb.SignedBeaconBlock {
+	s.initSyncBlocksLock.RLock()
+	defer s.initSyncBlocksLock.RUnlock()
+	b := s.initSyncBlocks[r]
+	return b
+}
+
+// This retrieves all the beacon blocks from the initial sync blocks cache, the returned
+// blocks are unordered.
+func (s *Service) getInitSyncBlocks() []*ethpb.SignedBeaconBlock {
+	s.initSyncBlocksLock.RLock()
+	defer s.initSyncBlocksLock.RUnlock()
+
+	blks := make([]*ethpb.SignedBeaconBlock, 0, len(s.initSyncBlocks))
+	for _, b := range s.initSyncBlocks {
+		blks = append(blks, b)
+	}
+	return blks
+}
+
+// This clears out the initial sync blocks cache.
+func (s *Service) clearInitSyncBlocks() {
+	s.initSyncBlocksLock.Lock()
+	defer s.initSyncBlocksLock.Unlock()
+	s.initSyncBlocks = make(map[[32]byte]*ethpb.SignedBeaconBlock)
+}

beacon-chain/blockchain/init_sync_process_block_test.go

@@ -0,0 +1,97 @@
+package blockchain
+
+import (
+	"context"
+	"testing"
+
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/go-ssz"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
+	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stateutil"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/testutil"
+	"gopkg.in/d4l3k/messagediff.v1"
+)
+
+func TestGenerateState_CorrectlyGenerated(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	cfg := &Config{BeaconDB: db, StateGen: stategen.New(db, sc)}
+	service, err := NewService(context.Background(), cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	beaconState, privs := testutil.DeterministicGenesisState(t, 32)
+	genesisBlock := testutil.NewBeaconBlock()
+	bodyRoot, err := stateutil.BlockRoot(genesisBlock.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = beaconState.SetLatestBlockHeader(&ethpb.BeaconBlockHeader{
+		Slot:       genesisBlock.Block.Slot,
+		ParentRoot: genesisBlock.Block.ParentRoot,
+		StateRoot:  params.BeaconConfig().ZeroHash[:],
+		BodyRoot:   bodyRoot[:],
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := beaconState.SetSlashings(make([]uint64, params.BeaconConfig().EpochsPerSlashingsVector)); err != nil {
+		t.Fatal(err)
+	}
+	cp := beaconState.CurrentJustifiedCheckpoint()
+	mockRoot := [32]byte{}
+	copy(mockRoot[:], "hello-world")
+	cp.Root = mockRoot[:]
+	if err := beaconState.SetCurrentJustifiedCheckpoint(cp); err != nil {
+		t.Fatal(err)
+	}
+	if err := beaconState.SetCurrentEpochAttestations([]*pb.PendingAttestation{}); err != nil {
+		t.Fatal(err)
+	}
+	err = db.SaveBlock(context.Background(), genesisBlock)
+	if err != nil {
+		t.Fatal(err)
+	}
+	genRoot, err := stateutil.BlockRoot(genesisBlock.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = db.SaveState(context.Background(), beaconState, genRoot)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	lastBlock := &ethpb.SignedBeaconBlock{}
+	for i := uint64(1); i < 10; i++ {
+		block, err := testutil.GenerateFullBlock(beaconState, privs, testutil.DefaultBlockGenConfig(), i)
+		if err != nil {
+			t.Fatal(err)
+		}
+		beaconState, err = state.ExecuteStateTransition(context.Background(), beaconState, block)
+		if err != nil {
+			t.Fatal(err)
+		}
+		err = db.SaveBlock(context.Background(), block)
+		if err != nil {
+			t.Fatal(err)
+		}
+		lastBlock = block
+	}
+	root, err := stateutil.BlockRoot(lastBlock.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	newState, err := service.generateState(context.Background(), genRoot, root)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !ssz.DeepEqual(newState.InnerStateUnsafe(), beaconState.InnerStateUnsafe()) {
+		diff, _ := messagediff.PrettyDiff(newState.InnerStateUnsafe(), beaconState.InnerStateUnsafe())
+		t.Errorf("Generated state is different from what is expected: %s", diff)
+	}
+}

beacon-chain/blockchain/log.go

@@ -0,0 +1,62 @@
+package blockchain
+
+import (
+	"encoding/hex"
+	"fmt"
+
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/sirupsen/logrus"
+)
+
+var log = logrus.WithField("prefix", "blockchain")
+
+// logs state transition related data every slot.
+func logStateTransitionData(b *ethpb.BeaconBlock) {
+	log.WithFields(logrus.Fields{
+		"attestations":      len(b.Body.Attestations),
+		"deposits":          len(b.Body.Deposits),
+		"attesterSlashings": len(b.Body.AttesterSlashings),
+		"proposerSlashings": len(b.Body.ProposerSlashings),
+		"voluntaryExits":    len(b.Body.VoluntaryExits),
+	}).Info("Finished applying state transition")
+}
+
+func logBlockSyncStatus(block *ethpb.BeaconBlock, blockRoot [32]byte, finalized *ethpb.Checkpoint) {
+	log.WithFields(logrus.Fields{
+		"slot":           block.Slot,
+		"block":          fmt.Sprintf("0x%s...", hex.EncodeToString(blockRoot[:])[:8]),
+		"epoch":          helpers.SlotToEpoch(block.Slot),
+		"finalizedEpoch": finalized.Epoch,
+		"finalizedRoot":  fmt.Sprintf("0x%s...", hex.EncodeToString(finalized.Root[:])[:8]),
+	}).Info("Synced new block")
+}
+
+func logEpochData(beaconState *stateTrie.BeaconState) {
+	log.WithFields(logrus.Fields{
+		"epoch":                  helpers.CurrentEpoch(beaconState),
+		"finalizedEpoch":         beaconState.FinalizedCheckpointEpoch(),
+		"justifiedEpoch":         beaconState.CurrentJustifiedCheckpoint().Epoch,
+		"previousJustifiedEpoch": beaconState.PreviousJustifiedCheckpoint().Epoch,
+	}).Info("Starting next epoch")
+	activeVals, err := helpers.ActiveValidatorIndices(beaconState, helpers.CurrentEpoch(beaconState))
+	if err != nil {
+		log.WithError(err).Error("Could not get active validator indices")
+		return
+	}
+	log.WithFields(logrus.Fields{
+		"totalValidators":  len(beaconState.Validators()),
+		"activeValidators": len(activeVals),
+		"averageBalance":   fmt.Sprintf("%.5f ETH", averageBalance(beaconState.Balances())),
+	}).Info("Validator registry information")
+}
+
+func averageBalance(balances []uint64) float64 {
+	total := uint64(0)
+	for i := 0; i < len(balances); i++ {
+		total += balances[i]
+	}
+	return float64(total) / float64(len(balances)) / float64(params.BeaconConfig().GweiPerEth)
+}

beacon-chain/blockchain/metrics.go

@@ -0,0 +1,223 @@
+package blockchain
+
+import (
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/roughtime"
+)
+
+var (
+	beaconSlot = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "beacon_slot",
+		Help: "Latest slot of the beacon chain state",
+	})
+	beaconHeadSlot = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "beacon_head_slot",
+		Help: "Slot of the head block of the beacon chain",
+	})
+	clockTimeSlot = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "beacon_clock_time_slot",
+		Help: "The current slot based on the genesis time and current clock",
+	})
+
+	headFinalizedEpoch = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "head_finalized_epoch",
+		Help: "Last finalized epoch of the head state",
+	})
+	headFinalizedRoot = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "head_finalized_root",
+		Help: "Last finalized root of the head state",
+	})
+	beaconFinalizedEpoch = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "beacon_finalized_epoch",
+		Help: "Last finalized epoch of the processed state",
+	})
+	beaconFinalizedRoot = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "beacon_finalized_root",
+		Help: "Last finalized root of the processed state",
+	})
+	beaconCurrentJustifiedEpoch = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "beacon_current_justified_epoch",
+		Help: "Current justified epoch of the processed state",
+	})
+	beaconCurrentJustifiedRoot = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "beacon_current_justified_root",
+		Help: "Current justified root of the processed state",
+	})
+	beaconPrevJustifiedEpoch = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "beacon_previous_justified_epoch",
+		Help: "Previous justified epoch of the processed state",
+	})
+	beaconPrevJustifiedRoot = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "beacon_previous_justified_root",
+		Help: "Previous justified root of the processed state",
+	})
+	validatorsCount = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "validator_count",
+		Help: "The total number of validators",
+	}, []string{"state"})
+	validatorsBalance = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "validators_total_balance",
+		Help: "The total balance of validators, in GWei",
+	}, []string{"state"})
+	validatorsEffectiveBalance = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "validators_total_effective_balance",
+		Help: "The total effective balance of validators, in GWei",
+	}, []string{"state"})
+	currentEth1DataDepositCount = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "current_eth1_data_deposit_count",
+		Help: "The current eth1 deposit count in the last processed state eth1data field.",
+	})
+	totalEligibleBalances = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "total_eligible_balances",
+		Help: "The total amount of ether, in gwei, that is eligible for voting of previous epoch",
+	})
+	totalVotedTargetBalances = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "total_voted_target_balances",
+		Help: "The total amount of ether, in gwei, that has been used in voting attestation target of previous epoch",
+	})
+	reorgCount = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "beacon_reorg_total",
+		Help: "Count the number of times beacon chain has a reorg",
+	})
+	sentBlockPropagationHistogram = promauto.NewHistogram(
+		prometheus.HistogramOpts{
+			Name:    "block_sent_latency_milliseconds",
+			Help:    "Captures blocks broadcast time. Blocks sent in milliseconds distribution",
+			Buckets: []float64{1000, 2000, 3000, 4000, 5000, 6000},
+		},
+	)
+	attestationInclusionDelay = promauto.NewHistogram(
+		prometheus.HistogramOpts{
+			Name:    "attestation_inclusion_delay_slots",
+			Help:    "The number of slots between att.Slot and block.Slot",
+			Buckets: []float64{1, 2, 3, 4, 6, 32, 64},
+		},
+	)
+)
+
+// reportSlotMetrics reports slot related metrics.
+func reportSlotMetrics(stateSlot uint64, headSlot uint64, clockSlot uint64, finalizedCheckpoint *ethpb.Checkpoint) {
+	clockTimeSlot.Set(float64(clockSlot))
+	beaconSlot.Set(float64(stateSlot))
+	beaconHeadSlot.Set(float64(headSlot))
+	if finalizedCheckpoint != nil {
+		headFinalizedEpoch.Set(float64(finalizedCheckpoint.Epoch))
+		headFinalizedRoot.Set(float64(bytesutil.ToLowInt64(finalizedCheckpoint.Root)))
+	}
+}
+
+// reportEpochMetrics reports epoch related metrics.
+func reportEpochMetrics(state *stateTrie.BeaconState) {
+	currentEpoch := state.Slot() / params.BeaconConfig().SlotsPerEpoch
+
+	// Validator instances
+	pendingInstances := 0
+	activeInstances := 0
+	slashingInstances := 0
+	slashedInstances := 0
+	exitingInstances := 0
+	exitedInstances := 0
+	// Validator balances
+	pendingBalance := uint64(0)
+	activeBalance := uint64(0)
+	activeEffectiveBalance := uint64(0)
+	exitingBalance := uint64(0)
+	exitingEffectiveBalance := uint64(0)
+	slashingBalance := uint64(0)
+	slashingEffectiveBalance := uint64(0)
+
+	for i, validator := range state.Validators() {
+		bal, err := state.BalanceAtIndex(uint64(i))
+		if err != nil {
+			log.Errorf("Could not load validator balance: %v", err)
+			continue
+		}
+		if validator.Slashed {
+			if currentEpoch < validator.ExitEpoch {
+				slashingInstances++
+				slashingBalance += bal
+				slashingEffectiveBalance += validator.EffectiveBalance
+			} else {
+				slashedInstances++
+			}
+			continue
+		}
+		if validator.ExitEpoch != params.BeaconConfig().FarFutureEpoch {
+			if currentEpoch < validator.ExitEpoch {
+				exitingInstances++
+				exitingBalance += bal
+				exitingEffectiveBalance += validator.EffectiveBalance
+			} else {
+				exitedInstances++
+			}
+			continue
+		}
+		if currentEpoch < validator.ActivationEpoch {
+			pendingInstances++
+			pendingBalance += bal
+			continue
+		}
+		activeInstances++
+		activeBalance += bal
+		activeEffectiveBalance += validator.EffectiveBalance
+	}
+	validatorsCount.WithLabelValues("Pending").Set(float64(pendingInstances))
+	validatorsCount.WithLabelValues("Active").Set(float64(activeInstances))
+	validatorsCount.WithLabelValues("Exiting").Set(float64(exitingInstances))
+	validatorsCount.WithLabelValues("Exited").Set(float64(exitedInstances))
+	validatorsCount.WithLabelValues("Slashing").Set(float64(slashingInstances))
+	validatorsCount.WithLabelValues("Slashed").Set(float64(slashedInstances))
+	validatorsBalance.WithLabelValues("Pending").Set(float64(pendingBalance))
+	validatorsBalance.WithLabelValues("Active").Set(float64(activeBalance))
+	validatorsBalance.WithLabelValues("Exiting").Set(float64(exitingBalance))
+	validatorsBalance.WithLabelValues("Slashing").Set(float64(slashingBalance))
+	validatorsEffectiveBalance.WithLabelValues("Active").Set(float64(activeEffectiveBalance))
+	validatorsEffectiveBalance.WithLabelValues("Exiting").Set(float64(exitingEffectiveBalance))
+	validatorsEffectiveBalance.WithLabelValues("Slashing").Set(float64(slashingEffectiveBalance))
+
+	// Last justified slot
+	beaconCurrentJustifiedEpoch.Set(float64(state.CurrentJustifiedCheckpoint().Epoch))
+	beaconCurrentJustifiedRoot.Set(float64(bytesutil.ToLowInt64(state.CurrentJustifiedCheckpoint().Root)))
+
+	// Last previous justified slot
+	beaconPrevJustifiedEpoch.Set(float64(state.PreviousJustifiedCheckpoint().Epoch))
+	beaconPrevJustifiedRoot.Set(float64(bytesutil.ToLowInt64(state.PreviousJustifiedCheckpoint().Root)))
+
+	// Last finalized slot
+	beaconFinalizedEpoch.Set(float64(state.FinalizedCheckpointEpoch()))
+	beaconFinalizedRoot.Set(float64(bytesutil.ToLowInt64(state.FinalizedCheckpoint().Root)))
+
+	currentEth1DataDepositCount.Set(float64(state.Eth1Data().DepositCount))
+
+	if precompute.Balances != nil {
+		totalEligibleBalances.Set(float64(precompute.Balances.ActivePrevEpoch))
+		totalVotedTargetBalances.Set(float64(precompute.Balances.PrevEpochTargetAttested))
+	}
+}
+
+// This captures metrics for block sent time by subtracts slot start time.
+func captureSentTimeMetric(genesisTime uint64, currentSlot uint64) error {
+	startTime, err := helpers.SlotToTime(genesisTime, currentSlot)
+	if err != nil {
+		return err
+	}
+	diffMs := roughtime.Now().Sub(startTime) / time.Millisecond
+	sentBlockPropagationHistogram.Observe(float64(diffMs))
+
+	return nil
+}
+
+func reportAttestationInclusion(blk *ethpb.BeaconBlock) {
+	for _, att := range blk.Body.Attestations {
+		attestationInclusionDelay.Observe(float64(blk.Slot - att.Data.Slot))
+	}
+}

beacon-chain/blockchain/process_attestation.go

@@ -0,0 +1,146 @@
+package blockchain
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/pkg/errors"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/flags"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/roughtime"
+	"go.opencensus.io/trace"
+)
+
+// ErrTargetRootNotInDB returns when the target block root of an attestation cannot be found in the
+// beacon database.
+var ErrTargetRootNotInDB = errors.New("target root does not exist in db")
+
+// onAttestation is called whenever an attestation is received, verifies the attestation is valid and saves
+// it to the DB. As a stateless function, this does not hold nor delay attestation based on the spec descriptions.
+// The delay is handled by the caller in `processAttestation`.
+//
+// Spec pseudocode definition:
+//   def on_attestation(store: Service, attestation: Attestation) -> None:
+//    """
+//    Run ``on_attestation`` upon receiving a new ``attestation`` from either within a block or directly on the wire.
+//
+//    An ``attestation`` that is asserted as invalid may be valid at a later time,
+//    consider scheduling it for later processing in such case.
+//    """
+//    target = attestation.data.target
+//
+//    # Attestations must be from the current or previous epoch
+//    current_epoch = compute_epoch_at_slot(get_current_slot(store))
+//    # Use GENESIS_EPOCH for previous when genesis to avoid underflow
+//    previous_epoch = current_epoch - 1 if current_epoch > GENESIS_EPOCH else GENESIS_EPOCH
+//    # If attestation target is from a future epoch, delay consideration until the epoch arrives
+//    assert target.epoch in [current_epoch, previous_epoch]
+//    assert target.epoch == compute_epoch_at_slot(attestation.data.slot)
+//
+//    # Attestations target be for a known block. If target block is unknown, delay consideration until the block is found
+//    assert target.root in store.blocks
+//
+//    # Attestations must be for a known block. If block is unknown, delay consideration until the block is found
+//    assert attestation.data.beacon_block_root in store.blocks
+//    # Attestations must not be for blocks in the future. If not, the attestation should not be considered
+//    assert store.blocks[attestation.data.beacon_block_root].slot <= attestation.data.slot
+//
+//    # Service target checkpoint state if not yet seen
+//    if target not in store.checkpoint_states:
+//        process_slots(base_state, compute_start_slot_at_epoch(target.epoch))
+//        store.checkpoint_states[target] = base_state
+//    target_state = store.checkpoint_states[target]
+//
+//    # Attestations can only affect the fork choice of subsequent slots.
+//    # Delay consideration in the fork choice until their slot is in the past.
+//    assert store.time >= (attestation.data.slot + 1) * SECONDS_PER_SLOT
+//
+//    # Get state at the `target` to validate attestation and calculate the committees
+//    indexed_attestation = get_indexed_attestation(target_state, attestation)
+//    assert is_valid_indexed_attestation(target_state, indexed_attestation)
+//
+//    # Update latest messages
+//    for i in indexed_attestation.attesting_indices:
+//        if i not in store.latest_messages or target.epoch > store.latest_messages[i].epoch:
+//            store.latest_messages[i] = LatestMessage(epoch=target.epoch, root=attestation.data.beacon_block_root)
+// TODO(#6072): This code path is highly untested. Requires comprehensive tests and simpler refactoring.
+func (s *Service) onAttestation(ctx context.Context, a *ethpb.Attestation) ([]uint64, error) {
+	ctx, span := trace.StartSpan(ctx, "blockchain.onAttestation")
+	defer span.End()
+
+	if a == nil {
+		return nil, errors.New("nil attestation")
+	}
+	if a.Data == nil {
+		return nil, errors.New("nil attestation.Data field")
+	}
+	if a.Data.Target == nil {
+		return nil, errors.New("nil attestation.Data.Target field")
+	}
+
+	tgt := stateTrie.CopyCheckpoint(a.Data.Target)
+
+	if helpers.SlotToEpoch(a.Data.Slot) != a.Data.Target.Epoch {
+		return nil, fmt.Errorf("data slot is not in the same epoch as target %d != %d", helpers.SlotToEpoch(a.Data.Slot), a.Data.Target.Epoch)
+	}
+
+	// Verify beacon node has seen the target block before.
+	if !s.hasBlock(ctx, bytesutil.ToBytes32(tgt.Root)) {
+		return nil, ErrTargetRootNotInDB
+	}
+
+	// Retrieve attestation's data beacon block pre state. Advance pre state to latest epoch if necessary and
+	// save it to the cache.
+	baseState, err := s.getAttPreState(ctx, tgt)
+	if err != nil {
+		return nil, err
+	}
+
+	genesisTime := baseState.GenesisTime()
+
+	// Verify attestation target is from current epoch or previous epoch.
+	if err := s.verifyAttTargetEpoch(ctx, genesisTime, uint64(roughtime.Now().Unix()), tgt); err != nil {
+		return nil, err
+	}
+
+	// Verify attestation beacon block is known and not from the future.
+	if err := s.verifyBeaconBlock(ctx, a.Data); err != nil {
+		return nil, errors.Wrap(err, "could not verify attestation beacon block")
+	}
+
+	// Verify LMG GHOST and FFG votes are consistent with each other.
+	if err := s.verifyLMDFFGConsistent(ctx, a.Data.Target.Epoch, a.Data.Target.Root, a.Data.BeaconBlockRoot); err != nil {
+		return nil, errors.Wrap(err, "could not verify attestation beacon block")
+	}
+
+	// Verify attestations can only affect the fork choice of subsequent slots.
+	if err := helpers.VerifySlotTime(genesisTime, a.Data.Slot+1, params.BeaconNetworkConfig().MaximumGossipClockDisparity); err != nil {
+		return nil, err
+	}
+
+	// Use the target state to validate attestation and calculate the committees.
+	indexedAtt, err := s.verifyAttestation(ctx, baseState, a)
+	if err != nil {
+		return nil, err
+	}
+
+	// Only save attestation in DB for archival node.
+	if flags.Get().EnableArchive {
+		if err := s.beaconDB.SaveAttestation(ctx, a); err != nil {
+			return nil, err
+		}
+	}
+
+	if indexedAtt.AttestingIndices == nil {
+		return nil, errors.New("nil attesting indices")
+	}
+
+	// Update forkchoice store with the new attestation for updating weight.
+	s.forkChoiceStore.ProcessAttestation(ctx, indexedAtt.AttestingIndices, bytesutil.ToBytes32(a.Data.BeaconBlockRoot), a.Data.Target.Epoch)
+
+	return indexedAtt.AttestingIndices, nil
+}

beacon-chain/blockchain/process_attestation_helpers.go

@@ -0,0 +1,118 @@
+package blockchain
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+
+	"github.com/pkg/errors"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/shared/attestationutil"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/params"
+)
+
+// getAttPreState retrieves the att pre state by either from the cache or the DB.
+func (s *Service) getAttPreState(ctx context.Context, c *ethpb.Checkpoint) (*stateTrie.BeaconState, error) {
+	s.checkpointStateLock.Lock()
+	defer s.checkpointStateLock.Unlock()
+	cachedState, err := s.checkpointState.StateByCheckpoint(c)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get cached checkpoint state")
+	}
+	if cachedState != nil {
+		return cachedState, nil
+	}
+
+	if !s.stateGen.HasState(ctx, bytesutil.ToBytes32(c.Root)) {
+		if err := s.beaconDB.SaveBlocks(ctx, s.getInitSyncBlocks()); err != nil {
+			return nil, errors.Wrap(err, "could not save initial sync blocks")
+		}
+		s.clearInitSyncBlocks()
+	}
+
+	baseState, err := s.stateGen.StateByRoot(ctx, bytesutil.ToBytes32(c.Root))
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not get pre state for slot %d", helpers.StartSlot(c.Epoch))
+	}
+
+	if helpers.StartSlot(c.Epoch) > baseState.Slot() {
+		baseState = baseState.Copy()
+		baseState, err = state.ProcessSlots(ctx, baseState, helpers.StartSlot(c.Epoch))
+		if err != nil {
+			return nil, errors.Wrapf(err, "could not process slots up to %d", helpers.StartSlot(c.Epoch))
+		}
+	}
+
+	if err := s.checkpointState.AddCheckpointState(&cache.CheckpointState{
+		Checkpoint: c,
+		State:      baseState,
+	}); err != nil {
+		return nil, errors.Wrap(err, "could not saved checkpoint state to cache")
+	}
+
+	return baseState, nil
+
+}
+
+// verifyAttTargetEpoch validates attestation is from the current or previous epoch.
+func (s *Service) verifyAttTargetEpoch(ctx context.Context, genesisTime uint64, nowTime uint64, c *ethpb.Checkpoint) error {
+	currentSlot := (nowTime - genesisTime) / params.BeaconConfig().SecondsPerSlot
+	currentEpoch := helpers.SlotToEpoch(currentSlot)
+	var prevEpoch uint64
+	// Prevents previous epoch under flow
+	if currentEpoch > 1 {
+		prevEpoch = currentEpoch - 1
+	}
+	if c.Epoch != prevEpoch && c.Epoch != currentEpoch {
+		return fmt.Errorf("target epoch %d does not match current epoch %d or prev epoch %d", c.Epoch, currentEpoch, prevEpoch)
+	}
+	return nil
+}
+
+// verifyBeaconBlock verifies beacon head block is known and not from the future.
+func (s *Service) verifyBeaconBlock(ctx context.Context, data *ethpb.AttestationData) error {
+	b, err := s.beaconDB.Block(ctx, bytesutil.ToBytes32(data.BeaconBlockRoot))
+	if err != nil {
+		return err
+	}
+	if b == nil || b.Block == nil {
+		return fmt.Errorf("beacon block %#x does not exist", bytesutil.Trunc(data.BeaconBlockRoot))
+	}
+	if b.Block.Slot > data.Slot {
+		return fmt.Errorf("could not process attestation for future block, block.Slot=%d > attestation.Data.Slot=%d", b.Block.Slot, data.Slot)
+	}
+	return nil
+}
+
+// verifyLMDFFGConsistent verifies LMD GHOST and FFG votes are consistent with each other.
+func (s *Service) verifyLMDFFGConsistent(ctx context.Context, ffgEpoch uint64, ffgRoot []byte, lmdRoot []byte) error {
+	ffgSlot := helpers.StartSlot(ffgEpoch)
+	r, err := s.ancestor(ctx, lmdRoot, ffgSlot)
+	if err != nil {
+		return err
+	}
+	if !bytes.Equal(ffgRoot, r) {
+		return errors.New("FFG and LMD votes are not consistent")
+	}
+
+	return nil
+}
+
+// verifyAttestation validates input attestation is valid.
+func (s *Service) verifyAttestation(ctx context.Context, baseState *stateTrie.BeaconState, a *ethpb.Attestation) (*ethpb.IndexedAttestation, error) {
+	committee, err := helpers.BeaconCommitteeFromState(baseState, a.Data.Slot, a.Data.CommitteeIndex)
+	if err != nil {
+		return nil, err
+	}
+	indexedAtt := attestationutil.ConvertToIndexed(ctx, a, committee)
+	if err := blocks.VerifyIndexedAttestation(ctx, baseState, indexedAtt); err != nil {
+		return nil, errors.Wrap(err, "could not verify indexed attestation")
+	}
+	return indexedAtt, nil
+}

beacon-chain/blockchain/process_attestation_test.go

@@ -0,0 +1,534 @@
+package blockchain
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"github.com/gogo/protobuf/proto"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
+	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
+	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stateutil"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/testutil"
+)
+
+func TestStore_OnAttestation(t *testing.T) {
+	ctx := context.Background()
+	db, sc := testDB.SetupDB(t)
+
+	cfg := &Config{
+		BeaconDB:        db,
+		ForkChoiceStore: protoarray.New(0, 0, [32]byte{}),
+		StateGen:        stategen.New(db, sc),
+	}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = blockTree1(db, []byte{'g'})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	BlkWithOutState := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 0}}
+	if err := db.SaveBlock(ctx, BlkWithOutState); err != nil {
+		t.Fatal(err)
+	}
+	BlkWithOutStateRoot, err := stateutil.BlockRoot(BlkWithOutState.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	BlkWithStateBadAtt := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 1}}
+	if err := db.SaveBlock(ctx, BlkWithStateBadAtt); err != nil {
+		t.Fatal(err)
+	}
+	BlkWithStateBadAttRoot, err := stateutil.BlockRoot(BlkWithStateBadAtt.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	s := testutil.NewBeaconState()
+	if err := s.SetSlot(100 * params.BeaconConfig().SlotsPerEpoch); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveState(ctx, s, BlkWithStateBadAttRoot); err != nil {
+		t.Fatal(err)
+	}
+
+	BlkWithValidState := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 2}}
+	if err := db.SaveBlock(ctx, BlkWithValidState); err != nil {
+		t.Fatal(err)
+	}
+
+	BlkWithValidStateRoot, err := stateutil.BlockRoot(BlkWithValidState.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	s = testutil.NewBeaconState()
+	if err := s.SetFork(&pb.Fork{
+		Epoch:           0,
+		CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
+		PreviousVersion: params.BeaconConfig().GenesisForkVersion,
+	}); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveState(ctx, s, BlkWithValidStateRoot); err != nil {
+		t.Fatal(err)
+	}
+
+	tests := []struct {
+		name          string
+		a             *ethpb.Attestation
+		s             *pb.BeaconState
+		wantErr       bool
+		wantErrString string
+	}{
+		{
+			name:          "attestation's data slot not aligned with target vote",
+			a:             &ethpb.Attestation{Data: &ethpb.AttestationData{Slot: params.BeaconConfig().SlotsPerEpoch, Target: &ethpb.Checkpoint{}}},
+			s:             &pb.BeaconState{},
+			wantErr:       true,
+			wantErrString: "data slot is not in the same epoch as target 1 != 0",
+		},
+		{
+			name:          "attestation's target root not in db",
+			a:             &ethpb.Attestation{Data: &ethpb.AttestationData{Target: &ethpb.Checkpoint{Root: []byte{'A'}}}},
+			s:             &pb.BeaconState{},
+			wantErr:       true,
+			wantErrString: "target root does not exist in db",
+		},
+		{
+			name:          "no pre state for attestations's target block",
+			a:             &ethpb.Attestation{Data: &ethpb.AttestationData{Target: &ethpb.Checkpoint{Root: BlkWithOutStateRoot[:]}}},
+			s:             &pb.BeaconState{},
+			wantErr:       true,
+			wantErrString: "could not get pre state for slot 0",
+		},
+		{
+			name: "process attestation doesn't match current epoch",
+			a: &ethpb.Attestation{Data: &ethpb.AttestationData{Slot: 100 * params.BeaconConfig().SlotsPerEpoch, Target: &ethpb.Checkpoint{Epoch: 100,
+				Root: BlkWithStateBadAttRoot[:]}}},
+			s:             &pb.BeaconState{Slot: 100 * params.BeaconConfig().SlotsPerEpoch},
+			wantErr:       true,
+			wantErrString: "does not match current epoch",
+		},
+		{
+			name:          "process nil field (a.Target) in attestation",
+			a:             nil,
+			s:             &pb.BeaconState{},
+			wantErr:       true,
+			wantErrString: "nil attestation",
+		},
+		{
+			name:          "process nil field (a.Data) in attestation",
+			a:             &ethpb.Attestation{},
+			s:             &pb.BeaconState{},
+			wantErr:       true,
+			wantErrString: "nil attestation.Data field",
+		},
+		{
+			name:          "process nil field (a.Target) in attestation",
+			a:             &ethpb.Attestation{Data: &ethpb.AttestationData{}},
+			s:             &pb.BeaconState{},
+			wantErr:       true,
+			wantErrString: "nil attestation.Data.Target field",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := service.onAttestation(ctx, tt.a)
+			if tt.wantErr {
+				if err == nil || !strings.Contains(err.Error(), tt.wantErrString) {
+					t.Errorf("Store.onAttestation() error = %v, wantErr = %v", err, tt.wantErrString)
+				}
+			} else {
+				t.Error(err)
+			}
+		})
+	}
+}
+
+func TestStore_SaveCheckpointState(t *testing.T) {
+	ctx := context.Background()
+	db, sc := testDB.SetupDB(t)
+
+	cfg := &Config{
+		BeaconDB: db,
+		StateGen: stategen.New(db, sc),
+	}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	s, err := stateTrie.InitializeFromProto(&pb.BeaconState{
+		Fork: &pb.Fork{
+			Epoch:           0,
+			CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
+			PreviousVersion: params.BeaconConfig().GenesisForkVersion,
+		},
+		RandaoMixes:         make([][]byte, params.BeaconConfig().EpochsPerHistoricalVector),
+		StateRoots:          make([][]byte, params.BeaconConfig().SlotsPerHistoricalRoot),
+		BlockRoots:          make([][]byte, params.BeaconConfig().SlotsPerHistoricalRoot),
+		LatestBlockHeader:   &ethpb.BeaconBlockHeader{},
+		JustificationBits:   []byte{0},
+		Slashings:           make([]uint64, params.BeaconConfig().EpochsPerSlashingsVector),
+		FinalizedCheckpoint: &ethpb.Checkpoint{Root: bytesutil.PadTo([]byte{'A'}, 32)},
+		Validators:          []*ethpb.Validator{{PublicKey: bytesutil.PadTo([]byte("foo"), 48)}},
+		Balances:            []uint64{0},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	r := [32]byte{'g'}
+	if err := service.beaconDB.SaveState(ctx, s, r); err != nil {
+		t.Fatal(err)
+	}
+
+	service.justifiedCheckpt = &ethpb.Checkpoint{Root: r[:]}
+	service.bestJustifiedCheckpt = &ethpb.Checkpoint{Root: r[:]}
+	service.finalizedCheckpt = &ethpb.Checkpoint{Root: r[:]}
+	service.prevFinalizedCheckpt = &ethpb.Checkpoint{Root: r[:]}
+
+	r = bytesutil.ToBytes32([]byte{'A'})
+	cp1 := &ethpb.Checkpoint{Epoch: 1, Root: bytesutil.PadTo([]byte{'A'}, 32)}
+	if err := service.beaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'A'})); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveStateSummary(ctx, &pb.StateSummary{Root: bytesutil.PadTo([]byte{'A'}, 32)}); err != nil {
+		t.Fatal(err)
+	}
+	s1, err := service.getAttPreState(ctx, cp1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s1.Slot() != 1*params.BeaconConfig().SlotsPerEpoch {
+		t.Errorf("Wanted state slot: %d, got: %d", 1*params.BeaconConfig().SlotsPerEpoch, s1.Slot())
+	}
+
+	cp2 := &ethpb.Checkpoint{Epoch: 2, Root: bytesutil.PadTo([]byte{'B'}, 32)}
+	if err := service.beaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'B'})); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveStateSummary(ctx, &pb.StateSummary{Root: bytesutil.PadTo([]byte{'B'}, 32)}); err != nil {
+		t.Fatal(err)
+	}
+	s2, err := service.getAttPreState(ctx, cp2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s2.Slot() != 2*params.BeaconConfig().SlotsPerEpoch {
+		t.Errorf("Wanted state slot: %d, got: %d", 2*params.BeaconConfig().SlotsPerEpoch, s2.Slot())
+	}
+
+	s1, err = service.getAttPreState(ctx, cp1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s1.Slot() != 1*params.BeaconConfig().SlotsPerEpoch {
+		t.Errorf("Wanted state slot: %d, got: %d", 1*params.BeaconConfig().SlotsPerEpoch, s1.Slot())
+	}
+
+	s1, err = service.checkpointState.StateByCheckpoint(cp1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s1.Slot() != 1*params.BeaconConfig().SlotsPerEpoch {
+		t.Errorf("Wanted state slot: %d, got: %d", 1*params.BeaconConfig().SlotsPerEpoch, s1.Slot())
+	}
+
+	s2, err = service.checkpointState.StateByCheckpoint(cp2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s2.Slot() != 2*params.BeaconConfig().SlotsPerEpoch {
+		t.Errorf("Wanted state slot: %d, got: %d", 2*params.BeaconConfig().SlotsPerEpoch, s2.Slot())
+	}
+
+	if err := s.SetSlot(params.BeaconConfig().SlotsPerEpoch + 1); err != nil {
+		t.Fatal(err)
+	}
+	service.justifiedCheckpt = &ethpb.Checkpoint{Root: r[:]}
+	service.bestJustifiedCheckpt = &ethpb.Checkpoint{Root: r[:]}
+	service.finalizedCheckpt = &ethpb.Checkpoint{Root: r[:]}
+	service.prevFinalizedCheckpt = &ethpb.Checkpoint{Root: r[:]}
+	cp3 := &ethpb.Checkpoint{Epoch: 1, Root: bytesutil.PadTo([]byte{'C'}, 32)}
+	if err := service.beaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'C'})); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveStateSummary(ctx, &pb.StateSummary{Root: bytesutil.PadTo([]byte{'C'}, 32)}); err != nil {
+		t.Fatal(err)
+	}
+	s3, err := service.getAttPreState(ctx, cp3)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s3.Slot() != s.Slot() {
+		t.Errorf("Wanted state slot: %d, got: %d", s.Slot(), s3.Slot())
+	}
+}
+
+func TestStore_UpdateCheckpointState(t *testing.T) {
+	ctx := context.Background()
+	db, sc := testDB.SetupDB(t)
+
+	cfg := &Config{
+		BeaconDB: db,
+		StateGen: stategen.New(db, sc),
+	}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	epoch := uint64(1)
+	baseState, _ := testutil.DeterministicGenesisState(t, 1)
+	if err := baseState.SetSlot(epoch * params.BeaconConfig().SlotsPerEpoch); err != nil {
+		t.Fatal(err)
+	}
+	checkpoint := &ethpb.Checkpoint{Epoch: epoch}
+	if err := service.beaconDB.SaveState(ctx, baseState, bytesutil.ToBytes32(checkpoint.Root)); err != nil {
+		t.Fatal(err)
+	}
+	returned, err := service.getAttPreState(ctx, checkpoint)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if baseState.Slot() != returned.Slot() {
+		t.Error("Incorrectly returned base state")
+	}
+
+	cached, err := service.checkpointState.StateByCheckpoint(checkpoint)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cached == nil {
+		t.Error("State should have been cached")
+	}
+
+	epoch = uint64(2)
+	newCheckpoint := &ethpb.Checkpoint{Epoch: epoch}
+	if err := service.beaconDB.SaveState(ctx, baseState, bytesutil.ToBytes32(newCheckpoint.Root)); err != nil {
+		t.Fatal(err)
+	}
+	returned, err = service.getAttPreState(ctx, newCheckpoint)
+	if err != nil {
+		t.Fatal(err)
+	}
+	baseState, err = state.ProcessSlots(ctx, baseState, helpers.StartSlot(newCheckpoint.Epoch))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if baseState.Slot() != returned.Slot() {
+		t.Error("Incorrectly returned base state")
+	}
+
+	cached, err = service.checkpointState.StateByCheckpoint(newCheckpoint)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !proto.Equal(returned.InnerStateUnsafe(), cached.InnerStateUnsafe()) {
+		t.Error("Incorrectly cached base state")
+	}
+}
+
+func TestAttEpoch_MatchPrevEpoch(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := service.verifyAttTargetEpoch(
+		ctx,
+		0,
+		params.BeaconConfig().SlotsPerEpoch*params.BeaconConfig().SecondsPerSlot,
+		&ethpb.Checkpoint{}); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestAttEpoch_MatchCurrentEpoch(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := service.verifyAttTargetEpoch(
+		ctx,
+		0,
+		params.BeaconConfig().SlotsPerEpoch*params.BeaconConfig().SecondsPerSlot,
+		&ethpb.Checkpoint{Epoch: 1}); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestAttEpoch_NotMatch(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := service.verifyAttTargetEpoch(
+		ctx,
+		0,
+		2*params.BeaconConfig().SlotsPerEpoch*params.BeaconConfig().SecondsPerSlot,
+		&ethpb.Checkpoint{}); !strings.Contains(err.Error(),
+		"target epoch 0 does not match current epoch 2 or prev epoch 1") {
+		t.Error("Did not receive wanted error")
+	}
+}
+
+func TestVerifyBeaconBlock_NoBlock(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	d := &ethpb.AttestationData{}
+	if err := service.verifyBeaconBlock(ctx, d); !strings.Contains(err.Error(), "beacon block  does not exist") {
+		t.Error("Did not receive the wanted error")
+	}
+}
+
+func TestVerifyBeaconBlock_futureBlock(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	b := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 2}}
+	if err := service.beaconDB.SaveBlock(ctx, b); err != nil {
+		t.Fatal(err)
+	}
+	r, err := stateutil.BlockRoot(b.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	d := &ethpb.AttestationData{Slot: 1, BeaconBlockRoot: r[:]}
+
+	err = service.verifyBeaconBlock(ctx, d)
+	if err == nil || !strings.Contains(err.Error(), "could not process attestation for future block") {
+		t.Error("Did not receive the wanted error")
+	}
+}
+
+func TestVerifyBeaconBlock_OK(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	b := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 2}}
+	if err := service.beaconDB.SaveBlock(ctx, b); err != nil {
+		t.Fatal(err)
+	}
+	r, err := stateutil.BlockRoot(b.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	d := &ethpb.AttestationData{Slot: 2, BeaconBlockRoot: r[:]}
+
+	if err := service.verifyBeaconBlock(ctx, d); err != nil {
+		t.Error("Did not receive the wanted error")
+	}
+}
+
+func TestVerifyLMDFFGConsistent_NotOK(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	b32 := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 32}}
+	if err := service.beaconDB.SaveBlock(ctx, b32); err != nil {
+		t.Fatal(err)
+	}
+	r32, err := stateutil.BlockRoot(b32.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	b33 := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 33, ParentRoot: r32[:]}}
+	if err := service.beaconDB.SaveBlock(ctx, b33); err != nil {
+		t.Fatal(err)
+	}
+	r33, err := stateutil.BlockRoot(b33.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	wanted := "FFG and LMD votes are not consistent"
+	if err := service.verifyLMDFFGConsistent(context.Background(), 1, []byte{'a'}, r33[:]); err.Error() != wanted {
+		t.Error("Did not get wanted error")
+	}
+}
+
+func TestVerifyLMDFFGConsistent_OK(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	b32 := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 32}}
+	if err := service.beaconDB.SaveBlock(ctx, b32); err != nil {
+		t.Fatal(err)
+	}
+	r32, err := stateutil.BlockRoot(b32.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	b33 := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 33, ParentRoot: r32[:]}}
+	if err := service.beaconDB.SaveBlock(ctx, b33); err != nil {
+		t.Fatal(err)
+	}
+	r33, err := stateutil.BlockRoot(b33.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := service.verifyLMDFFGConsistent(context.Background(), 1, r32[:], r33[:]); err != nil {
+		t.Errorf("Could not verify LMD and FFG votes to be consistent: %v", err)
+	}
+}

beacon-chain/blockchain/process_block.go

@@ -0,0 +1,299 @@
+package blockchain
+
+import (
+	"context"
+	"encoding/hex"
+	"fmt"
+
+	"github.com/pkg/errors"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/flags"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/shared/attestationutil"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/featureconfig"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
+)
+
+// This defines size of the upper bound for initial sync block cache.
+var initialSyncBlockCacheSize = 2 * params.BeaconConfig().SlotsPerEpoch
+
+// onBlock is called when a gossip block is received. It runs regular state transition on the block.
+// The block's signing root should be computed before calling this method to avoid redundant
+// computation in this method and methods it calls into.
+//
+// Spec pseudocode definition:
+//   def on_block(store: Store, block: BeaconBlock) -> None:
+//    # Make a copy of the state to avoid mutability issues
+//    assert block.parent_root in store.block_states
+//    pre_state = store.block_states[block.parent_root].copy()
+//    # Blocks cannot be in the future. If they are, their consideration must be delayed until the are in the past.
+//    assert store.time >= pre_state.genesis_time + block.slot * SECONDS_PER_SLOT
+//    # Add new block to the store
+//    store.blocks[signing_root(block)] = block
+//    # Check block is a descendant of the finalized block
+//    assert (
+//        get_ancestor(store, signing_root(block), store.blocks[store.finalized_checkpoint.root].slot) ==
+//        store.finalized_checkpoint.root
+//    )
+//    # Check that block is later than the finalized epoch slot
+//    assert block.slot > compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)
+//    # Check the block is valid and compute the post-state
+//    state = state_transition(pre_state, block)
+//    # Add new state for this block to the store
+//    store.block_states[signing_root(block)] = state
+//
+//    # Update justified checkpoint
+//    if state.current_justified_checkpoint.epoch > store.justified_checkpoint.epoch:
+//        if state.current_justified_checkpoint.epoch > store.best_justified_checkpoint.epoch:
+//            store.best_justified_checkpoint = state.current_justified_checkpoint
+//
+//    # Update finalized checkpoint
+//    if state.finalized_checkpoint.epoch > store.finalized_checkpoint.epoch:
+//        store.finalized_checkpoint = state.finalized_checkpoint
+func (s *Service) onBlock(ctx context.Context, signed *ethpb.SignedBeaconBlock, blockRoot [32]byte) (*stateTrie.BeaconState, error) {
+	ctx, span := trace.StartSpan(ctx, "blockchain.onBlock")
+	defer span.End()
+
+	if signed == nil || signed.Block == nil {
+		return nil, errors.New("nil block")
+	}
+
+	b := signed.Block
+
+	// Retrieve incoming block's pre state.
+	preState, err := s.getBlockPreState(ctx, b)
+	if err != nil {
+		return nil, err
+	}
+
+	log.WithFields(logrus.Fields{
+		"slot": b.Slot,
+		"root": fmt.Sprintf("0x%s...", hex.EncodeToString(blockRoot[:])[:8]),
+	}).Debug("Executing state transition on block")
+
+	postState, err := state.ExecuteStateTransition(ctx, preState, signed)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not execute state transition")
+	}
+
+	if err := s.beaconDB.SaveBlock(ctx, signed); err != nil {
+		return nil, errors.Wrapf(err, "could not save block from slot %d", b.Slot)
+	}
+
+	if err := s.insertBlockToForkChoiceStore(ctx, b, blockRoot, postState); err != nil {
+		return nil, errors.Wrapf(err, "could not insert block %d to fork choice store", b.Slot)
+	}
+
+	if err := s.stateGen.SaveState(ctx, blockRoot, postState); err != nil {
+		return nil, errors.Wrap(err, "could not save state")
+	}
+
+	// Update justified check point.
+	if postState.CurrentJustifiedCheckpoint().Epoch > s.justifiedCheckpt.Epoch {
+		if err := s.updateJustified(ctx, postState); err != nil {
+			return nil, err
+		}
+	}
+
+	// Update finalized check point. Prune the block cache and helper caches on every new finalized epoch.
+	if postState.FinalizedCheckpointEpoch() > s.finalizedCheckpt.Epoch {
+		if err := s.beaconDB.SaveBlocks(ctx, s.getInitSyncBlocks()); err != nil {
+			return nil, err
+		}
+		s.clearInitSyncBlocks()
+
+		if err := s.beaconDB.SaveFinalizedCheckpoint(ctx, postState.FinalizedCheckpoint()); err != nil {
+			return nil, errors.Wrap(err, "could not save finalized checkpoint")
+		}
+
+		fRoot := bytesutil.ToBytes32(postState.FinalizedCheckpoint().Root)
+
+		// Prune proto array fork choice nodes, all nodes before finalized check point will
+		// be pruned.
+		if err := s.forkChoiceStore.Prune(ctx, fRoot); err != nil {
+			return nil, errors.Wrap(err, "could not prune proto array fork choice nodes")
+		}
+
+		s.prevFinalizedCheckpt = s.finalizedCheckpt
+		s.finalizedCheckpt = postState.FinalizedCheckpoint()
+
+		if err := s.finalizedImpliesNewJustified(ctx, postState); err != nil {
+			return nil, errors.Wrap(err, "could not save new justified")
+		}
+
+		fBlock, err := s.beaconDB.Block(ctx, fRoot)
+		if err != nil {
+			return nil, errors.Wrap(err, "could not get finalized block to migrate")
+		}
+		if err := s.stateGen.MigrateToCold(ctx, fBlock.Block.Slot, fRoot); err != nil {
+			return nil, errors.Wrap(err, "could not migrate to cold")
+		}
+	}
+
+	// Epoch boundary bookkeeping such as logging epoch summaries.
+	if postState.Slot() >= s.nextEpochBoundarySlot {
+		logEpochData(postState)
+		reportEpochMetrics(postState)
+
+		// Update committees cache at epoch boundary slot.
+		if err := helpers.UpdateCommitteeCache(postState, helpers.CurrentEpoch(postState)); err != nil {
+			return nil, err
+		}
+		if err := helpers.UpdateProposerIndicesInCache(postState, helpers.CurrentEpoch(postState)); err != nil {
+			return nil, err
+		}
+
+		s.nextEpochBoundarySlot = helpers.StartSlot(helpers.NextEpoch(postState))
+	}
+
+	// Delete the processed block attestations from attestation pool.
+	if err := s.deletePoolAtts(b.Body.Attestations); err != nil {
+		return nil, err
+	}
+
+	// Delete the processed block attester slashings from slashings pool.
+	for i := 0; i < len(b.Body.AttesterSlashings); i++ {
+		s.slashingPool.MarkIncludedAttesterSlashing(b.Body.AttesterSlashings[i])
+	}
+
+	defer reportAttestationInclusion(b)
+
+	return postState, nil
+}
+
+// onBlockInitialSyncStateTransition is called when an initial sync block is received.
+// It runs state transition on the block and without any BLS verification. The excluded BLS verification
+// includes attestation's aggregated signature. It also does not save attestations.
+// The block's signing root should be computed before calling this method to avoid redundant
+// computation in this method and methods it calls into.
+func (s *Service) onBlockInitialSyncStateTransition(ctx context.Context, signed *ethpb.SignedBeaconBlock, blockRoot [32]byte) error {
+	ctx, span := trace.StartSpan(ctx, "blockchain.onBlock")
+	defer span.End()
+
+	if signed == nil || signed.Block == nil {
+		return errors.New("nil block")
+	}
+
+	b := signed.Block
+
+	// Retrieve incoming block's pre state.
+	preState, err := s.verifyBlkPreState(ctx, b)
+	if err != nil {
+		return err
+	}
+	// To invalidate cache for parent root because pre state will get mutated.
+	s.stateGen.DeleteHotStateInCache(bytesutil.ToBytes32(b.ParentRoot))
+
+	// Exit early if the pre state slot is higher than incoming block's slot.
+	if preState.Slot() >= signed.Block.Slot {
+		return nil
+	}
+
+	var postState *stateTrie.BeaconState
+	if featureconfig.Get().InitSyncNoVerify {
+		postState, err = state.ExecuteStateTransitionNoVerifyAttSigs(ctx, preState, signed)
+	} else {
+		postState, err = state.ExecuteStateTransition(ctx, preState, signed)
+	}
+	if err != nil {
+		return errors.Wrap(err, "could not execute state transition")
+	}
+
+	s.saveInitSyncBlock(blockRoot, signed)
+
+	if err := s.insertBlockToForkChoiceStore(ctx, b, blockRoot, postState); err != nil {
+		return errors.Wrapf(err, "could not insert block %d to fork choice store", b.Slot)
+	}
+
+	if err := s.stateGen.SaveState(ctx, blockRoot, postState); err != nil {
+		return errors.Wrap(err, "could not save state")
+	}
+
+	if flags.Get().EnableArchive {
+		atts := signed.Block.Body.Attestations
+		if err := s.beaconDB.SaveAttestations(ctx, atts); err != nil {
+			return errors.Wrapf(err, "could not save block attestations from slot %d", b.Slot)
+		}
+	}
+
+	// Rate limit how many blocks (2 epochs worth of blocks) a node keeps in the memory.
+	if uint64(len(s.getInitSyncBlocks())) > initialSyncBlockCacheSize {
+		if err := s.beaconDB.SaveBlocks(ctx, s.getInitSyncBlocks()); err != nil {
+			return err
+		}
+		s.clearInitSyncBlocks()
+	}
+
+	// Update finalized check point. Prune the block cache and helper caches on every new finalized epoch.
+	if postState.FinalizedCheckpointEpoch() > s.finalizedCheckpt.Epoch {
+		if err := s.beaconDB.SaveBlocks(ctx, s.getInitSyncBlocks()); err != nil {
+			return err
+		}
+		s.clearInitSyncBlocks()
+
+		if err := s.beaconDB.SaveFinalizedCheckpoint(ctx, postState.FinalizedCheckpoint()); err != nil {
+			return errors.Wrap(err, "could not save finalized checkpoint")
+		}
+
+		s.prevFinalizedCheckpt = s.finalizedCheckpt
+		s.finalizedCheckpt = postState.FinalizedCheckpoint()
+
+		fRoot := bytesutil.ToBytes32(postState.FinalizedCheckpoint().Root)
+		fBlock, err := s.beaconDB.Block(ctx, fRoot)
+		if err != nil {
+			return errors.Wrap(err, "could not get finalized block to migrate")
+		}
+		if err := s.stateGen.MigrateToCold(ctx, fBlock.Block.Slot, fRoot); err != nil {
+			return errors.Wrap(err, "could not migrate to cold")
+		}
+	}
+
+	// Epoch boundary bookkeeping such as logging epoch summaries.
+	if postState.Slot() >= s.nextEpochBoundarySlot {
+		reportEpochMetrics(postState)
+		s.nextEpochBoundarySlot = helpers.StartSlot(helpers.NextEpoch(postState))
+
+		// Update committees cache at epoch boundary slot.
+		if err := helpers.UpdateCommitteeCache(postState, helpers.CurrentEpoch(postState)); err != nil {
+			return err
+		}
+		if err := helpers.UpdateProposerIndicesInCache(postState, helpers.CurrentEpoch(postState)); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// This feeds in the block and block's attestations to fork choice store. It's allows fork choice store
+// to gain information on the most current chain.
+func (s *Service) insertBlockToForkChoiceStore(ctx context.Context, blk *ethpb.BeaconBlock, root [32]byte, state *stateTrie.BeaconState) error {
+	if err := s.fillInForkChoiceMissingBlocks(ctx, blk, state); err != nil {
+		return err
+	}
+
+	// Feed in block to fork choice store.
+	if err := s.forkChoiceStore.ProcessBlock(ctx,
+		blk.Slot, root, bytesutil.ToBytes32(blk.ParentRoot), bytesutil.ToBytes32(blk.Body.Graffiti),
+		state.CurrentJustifiedCheckpoint().Epoch,
+		state.FinalizedCheckpointEpoch()); err != nil {
+		return errors.Wrap(err, "could not process block for proto array fork choice")
+	}
+
+	// Feed in block's attestations to fork choice store.
+	for _, a := range blk.Body.Attestations {
+		committee, err := helpers.BeaconCommitteeFromState(state, a.Data.Slot, a.Data.CommitteeIndex)
+		if err != nil {
+			return err
+		}
+		indices := attestationutil.AttestingIndices(a.AggregationBits, committee)
+		s.forkChoiceStore.ProcessAttestation(ctx, indices, bytesutil.ToBytes32(a.Data.BeaconBlockRoot), a.Data.Target.Epoch)
+	}
+
+	return nil
+}

beacon-chain/blockchain/process_block_helpers.go

@@ -0,0 +1,362 @@
+package blockchain
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+
+	"github.com/pkg/errors"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stateutil"
+	"github.com/prysmaticlabs/prysm/shared/attestationutil"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/roughtime"
+	"github.com/prysmaticlabs/prysm/shared/traceutil"
+	"go.opencensus.io/trace"
+)
+
+// CurrentSlot returns the current slot based on time.
+func (s *Service) CurrentSlot() uint64 {
+	now := roughtime.Now().Unix()
+	genesis := s.genesisTime.Unix()
+	if now < genesis {
+		return 0
+	}
+	return uint64(now-genesis) / params.BeaconConfig().SecondsPerSlot
+}
+
+// getBlockPreState returns the pre state of an incoming block. It uses the parent root of the block
+// to retrieve the state in DB. It verifies the pre state's validity and the incoming block
+// is in the correct time window.
+func (s *Service) getBlockPreState(ctx context.Context, b *ethpb.BeaconBlock) (*stateTrie.BeaconState, error) {
+	ctx, span := trace.StartSpan(ctx, "forkchoice.getBlockPreState")
+	defer span.End()
+
+	// Verify incoming block has a valid pre state.
+	preState, err := s.verifyBlkPreState(ctx, b)
+	if err != nil {
+		return nil, err
+	}
+
+	preState, err = s.stateGen.StateByRoot(ctx, bytesutil.ToBytes32(b.ParentRoot))
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not get pre state for slot %d", b.Slot)
+	}
+	if preState == nil {
+		return nil, errors.Wrapf(err, "nil pre state for slot %d", b.Slot)
+	}
+
+	// Verify block slot time is not from the future.
+	if err := helpers.VerifySlotTime(preState.GenesisTime(), b.Slot, params.BeaconNetworkConfig().MaximumGossipClockDisparity); err != nil {
+		return nil, err
+	}
+
+	// Verify block is a descendent of a finalized block.
+	if err := s.verifyBlkDescendant(ctx, bytesutil.ToBytes32(b.ParentRoot), b.Slot); err != nil {
+		return nil, err
+	}
+
+	// Verify block is later than the finalized epoch slot.
+	if err := s.verifyBlkFinalizedSlot(b); err != nil {
+		return nil, err
+	}
+
+	return preState, nil
+}
+
+// verifyBlkPreState validates input block has a valid pre-state.
+func (s *Service) verifyBlkPreState(ctx context.Context, b *ethpb.BeaconBlock) (*stateTrie.BeaconState, error) {
+	ctx, span := trace.StartSpan(ctx, "chainService.verifyBlkPreState")
+	defer span.End()
+
+	parentRoot := bytesutil.ToBytes32(b.ParentRoot)
+	// Loosen the check to HasBlock because state summary gets saved in batches
+	// during initial syncing. There's no risk given a state summary object is just a
+	// a subset of the block object.
+	if !s.stateGen.StateSummaryExists(ctx, parentRoot) && !s.beaconDB.HasBlock(ctx, parentRoot) {
+		return nil, errors.New("could not reconstruct parent state")
+	}
+	if !s.stateGen.HasState(ctx, parentRoot) {
+		if err := s.beaconDB.SaveBlocks(ctx, s.getInitSyncBlocks()); err != nil {
+			return nil, errors.Wrap(err, "could not save initial sync blocks")
+		}
+		s.clearInitSyncBlocks()
+	}
+	preState, err := s.stateGen.StateByRootInitialSync(ctx, parentRoot)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not get pre state for slot %d", b.Slot)
+	}
+	if preState == nil {
+		return nil, errors.Wrapf(err, "nil pre state for slot %d", b.Slot)
+	}
+
+	return preState, nil // No copy needed from newly hydrated state gen object.
+}
+
+// verifyBlkDescendant validates input block root is a descendant of the
+// current finalized block root.
+func (s *Service) verifyBlkDescendant(ctx context.Context, root [32]byte, slot uint64) error {
+	ctx, span := trace.StartSpan(ctx, "forkchoice.verifyBlkDescendant")
+	defer span.End()
+
+	finalizedBlkSigned, err := s.beaconDB.Block(ctx, bytesutil.ToBytes32(s.finalizedCheckpt.Root))
+	if err != nil || finalizedBlkSigned == nil || finalizedBlkSigned.Block == nil {
+		return errors.Wrap(err, "could not get finalized block")
+	}
+	finalizedBlk := finalizedBlkSigned.Block
+
+	bFinalizedRoot, err := s.ancestor(ctx, root[:], finalizedBlk.Slot)
+	if err != nil {
+		return errors.Wrap(err, "could not get finalized block root")
+	}
+	if bFinalizedRoot == nil {
+		return fmt.Errorf("no finalized block known for block from slot %d", slot)
+	}
+
+	if !bytes.Equal(bFinalizedRoot, s.finalizedCheckpt.Root) {
+		err := fmt.Errorf("block from slot %d is not a descendent of the current finalized block slot %d, %#x != %#x",
+			slot, finalizedBlk.Slot, bytesutil.Trunc(bFinalizedRoot), bytesutil.Trunc(s.finalizedCheckpt.Root))
+		traceutil.AnnotateError(span, err)
+		return err
+	}
+	return nil
+}
+
+// verifyBlkFinalizedSlot validates input block is not less than or equal
+// to current finalized slot.
+func (s *Service) verifyBlkFinalizedSlot(b *ethpb.BeaconBlock) error {
+	finalizedSlot := helpers.StartSlot(s.finalizedCheckpt.Epoch)
+	if finalizedSlot >= b.Slot {
+		return fmt.Errorf("block is equal or earlier than finalized block, slot %d < slot %d", b.Slot, finalizedSlot)
+	}
+	return nil
+}
+
+// shouldUpdateCurrentJustified prevents bouncing attack, by only update conflicting justified
+// checkpoints in the fork choice if in the early slots of the epoch.
+// Otherwise, delay incorporation of new justified checkpoint until next epoch boundary.
+// See https://ethresear.ch/t/prevention-of-bouncing-attack-on-ffg/6114 for more detailed analysis and discussion.
+func (s *Service) shouldUpdateCurrentJustified(ctx context.Context, newJustifiedCheckpt *ethpb.Checkpoint) (bool, error) {
+	if helpers.SlotsSinceEpochStarts(s.CurrentSlot()) < params.BeaconConfig().SafeSlotsToUpdateJustified {
+		return true, nil
+	}
+	var newJustifiedBlockSigned *ethpb.SignedBeaconBlock
+	justifiedRoot := s.ensureRootNotZeros(bytesutil.ToBytes32(newJustifiedCheckpt.Root))
+	var err error
+	if s.hasInitSyncBlock(justifiedRoot) {
+		newJustifiedBlockSigned = s.getInitSyncBlock(justifiedRoot)
+	} else {
+		newJustifiedBlockSigned, err = s.beaconDB.Block(ctx, justifiedRoot)
+		if err != nil {
+			return false, err
+		}
+	}
+	if newJustifiedBlockSigned == nil || newJustifiedBlockSigned.Block == nil {
+		return false, errors.New("nil new justified block")
+	}
+
+	newJustifiedBlock := newJustifiedBlockSigned.Block
+	if newJustifiedBlock.Slot <= helpers.StartSlot(s.justifiedCheckpt.Epoch) {
+		return false, nil
+	}
+	var justifiedBlockSigned *ethpb.SignedBeaconBlock
+	cachedJustifiedRoot := s.ensureRootNotZeros(bytesutil.ToBytes32(s.justifiedCheckpt.Root))
+	if s.hasInitSyncBlock(cachedJustifiedRoot) {
+		justifiedBlockSigned = s.getInitSyncBlock(cachedJustifiedRoot)
+	} else {
+		justifiedBlockSigned, err = s.beaconDB.Block(ctx, cachedJustifiedRoot)
+		if err != nil {
+			return false, err
+		}
+	}
+
+	if justifiedBlockSigned == nil || justifiedBlockSigned.Block == nil {
+		return false, errors.New("nil justified block")
+	}
+	justifiedBlock := justifiedBlockSigned.Block
+	b, err := s.ancestor(ctx, justifiedRoot[:], justifiedBlock.Slot)
+	if err != nil {
+		return false, err
+	}
+	if !bytes.Equal(b, s.justifiedCheckpt.Root) {
+		return false, nil
+	}
+	return true, nil
+}
+
+func (s *Service) updateJustified(ctx context.Context, state *stateTrie.BeaconState) error {
+	cpt := state.CurrentJustifiedCheckpoint()
+	if cpt.Epoch > s.bestJustifiedCheckpt.Epoch {
+		s.bestJustifiedCheckpt = cpt
+	}
+	canUpdate, err := s.shouldUpdateCurrentJustified(ctx, cpt)
+	if err != nil {
+		return err
+	}
+
+	if canUpdate {
+		s.prevJustifiedCheckpt = s.justifiedCheckpt
+		s.justifiedCheckpt = cpt
+		if err := s.cacheJustifiedStateBalances(ctx, bytesutil.ToBytes32(s.justifiedCheckpt.Root)); err != nil {
+			return err
+		}
+	}
+
+	return s.beaconDB.SaveJustifiedCheckpoint(ctx, cpt)
+}
+
+// ancestor returns the block root of an ancestry block from the input block root.
+//
+// Spec pseudocode definition:
+//   def get_ancestor(store: Store, root: Root, slot: Slot) -> Root:
+//    block = store.blocks[root]
+//    if block.slot > slot:
+//        return get_ancestor(store, block.parent_root, slot)
+//    elif block.slot == slot:
+//        return root
+//    else:
+//        # root is older than queried slot, thus a skip slot. Return most recent root prior to slot
+//        return root
+func (s *Service) ancestor(ctx context.Context, root []byte, slot uint64) ([]byte, error) {
+	ctx, span := trace.StartSpan(ctx, "forkchoice.ancestor")
+	defer span.End()
+
+	// Stop recursive ancestry lookup if context is cancelled.
+	if ctx.Err() != nil {
+		return nil, ctx.Err()
+	}
+
+	signed, err := s.beaconDB.Block(ctx, bytesutil.ToBytes32(root))
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get ancestor block")
+	}
+
+	if s.hasInitSyncBlock(bytesutil.ToBytes32(root)) {
+		signed = s.getInitSyncBlock(bytesutil.ToBytes32(root))
+	}
+
+	if signed == nil || signed.Block == nil {
+		return nil, errors.New("nil block")
+	}
+	b := signed.Block
+
+	if b.Slot == slot || b.Slot < slot {
+		return root, nil
+	}
+
+	return s.ancestor(ctx, b.ParentRoot, slot)
+}
+
+// This updates justified check point in store, if the new justified is later than stored justified or
+// the store's justified is not in chain with finalized check point.
+//
+// Spec definition:
+//   # Potentially update justified if different from store
+//        if store.justified_checkpoint != state.current_justified_checkpoint:
+//            # Update justified if new justified is later than store justified
+//            if state.current_justified_checkpoint.epoch > store.justified_checkpoint.epoch:
+//                store.justified_checkpoint = state.current_justified_checkpoint
+//                return
+//            # Update justified if store justified is not in chain with finalized checkpoint
+//            finalized_slot = compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)
+//            ancestor_at_finalized_slot = get_ancestor(store, store.justified_checkpoint.root, finalized_slot)
+//            if ancestor_at_finalized_slot != store.finalized_checkpoint.root:
+//                store.justified_checkpoint = state.current_justified_checkpoint
+func (s *Service) finalizedImpliesNewJustified(ctx context.Context, state *stateTrie.BeaconState) error {
+	// Update justified if it's different than the one cached in the store.
+	if !attestationutil.CheckPointIsEqual(s.justifiedCheckpt, state.CurrentJustifiedCheckpoint()) {
+		if state.CurrentJustifiedCheckpoint().Epoch > s.justifiedCheckpt.Epoch {
+			s.justifiedCheckpt = state.CurrentJustifiedCheckpoint()
+			if err := s.cacheJustifiedStateBalances(ctx, bytesutil.ToBytes32(s.justifiedCheckpt.Root)); err != nil {
+				return err
+			}
+			return nil
+		}
+
+		// Update justified if store justified is not in chain with finalized check point.
+		finalizedSlot := helpers.StartSlot(s.finalizedCheckpt.Epoch)
+		justifiedRoot := s.ensureRootNotZeros(bytesutil.ToBytes32(s.justifiedCheckpt.Root))
+		anc, err := s.ancestor(ctx, justifiedRoot[:], finalizedSlot)
+		if err != nil {
+			return err
+		}
+		if !bytes.Equal(anc, s.finalizedCheckpt.Root) {
+			s.justifiedCheckpt = state.CurrentJustifiedCheckpoint()
+			if err := s.cacheJustifiedStateBalances(ctx, bytesutil.ToBytes32(s.justifiedCheckpt.Root)); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// This retrieves missing blocks from DB (ie. the blocks that couldn't be received over sync) and inserts them to fork choice store.
+// This is useful for block tree visualizer and additional vote accounting.
+func (s *Service) fillInForkChoiceMissingBlocks(ctx context.Context, blk *ethpb.BeaconBlock, state *stateTrie.BeaconState) error {
+	pendingNodes := make([]*ethpb.BeaconBlock, 0)
+
+	parentRoot := bytesutil.ToBytes32(blk.ParentRoot)
+	slot := blk.Slot
+	// Fork choice only matters from last finalized slot.
+	higherThanFinalized := slot > helpers.StartSlot(s.finalizedCheckpt.Epoch)
+	// As long as parent node is not in fork choice store, and parent node is in DB.
+	for !s.forkChoiceStore.HasNode(parentRoot) && s.beaconDB.HasBlock(ctx, parentRoot) && higherThanFinalized {
+		b, err := s.beaconDB.Block(ctx, parentRoot)
+		if err != nil {
+			return err
+		}
+
+		pendingNodes = append(pendingNodes, b.Block)
+		parentRoot = bytesutil.ToBytes32(b.Block.ParentRoot)
+		slot = b.Block.Slot
+		higherThanFinalized = slot > helpers.StartSlot(s.finalizedCheckpt.Epoch)
+	}
+
+	// Insert parent nodes to fork choice store in reverse order.
+	// Lower slots should be at the end of the list.
+	for i := len(pendingNodes) - 1; i >= 0; i-- {
+		b := pendingNodes[i]
+		r, err := stateutil.BlockRoot(b)
+		if err != nil {
+			return err
+		}
+
+		if err := s.forkChoiceStore.ProcessBlock(ctx,
+			b.Slot, r, bytesutil.ToBytes32(b.ParentRoot), bytesutil.ToBytes32(b.Body.Graffiti),
+			state.CurrentJustifiedCheckpoint().Epoch,
+			state.FinalizedCheckpointEpoch()); err != nil {
+			return errors.Wrap(err, "could not process block for proto array fork choice")
+		}
+	}
+
+	return nil
+}
+
+// The deletes input attestations from the attestation pool, so proposers don't include them in a block for the future.
+func (s *Service) deletePoolAtts(atts []*ethpb.Attestation) error {
+	for _, att := range atts {
+		if helpers.IsAggregated(att) {
+			if err := s.attPool.DeleteAggregatedAttestation(att); err != nil {
+				return err
+			}
+		} else {
+			if err := s.attPool.DeleteUnaggregatedAttestation(att); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+// This ensures that the input root defaults to using genesis root instead of zero hashes. This is needed for handling
+// fork choice justification routine.
+func (s *Service) ensureRootNotZeros(root [32]byte) [32]byte {
+	if root == params.BeaconConfig().ZeroHash {
+		return s.genesisRoot
+	}
+	return root
+}

beacon-chain/blockchain/process_block_test.go

@@ -0,0 +1,724 @@
+package blockchain
+
+import (
+	"context"
+	"reflect"
+	"strings"
+	"testing"
+	"time"
+
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/go-ssz"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
+	"github.com/prysmaticlabs/prysm/beacon-chain/db"
+	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
+	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stateutil"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+	"github.com/prysmaticlabs/prysm/shared/attestationutil"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/featureconfig"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/roughtime"
+	"github.com/prysmaticlabs/prysm/shared/testutil"
+)
+
+func TestStore_OnBlock(t *testing.T) {
+	ctx := context.Background()
+	db, sc := testDB.SetupDB(t)
+
+	cfg := &Config{
+		BeaconDB: db,
+		StateGen: stategen.New(db, sc),
+	}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	genesisStateRoot := [32]byte{}
+	genesis := blocks.NewGenesisBlock(genesisStateRoot[:])
+	if err := db.SaveBlock(ctx, genesis); err != nil {
+		t.Error(err)
+	}
+	validGenesisRoot, err := stateutil.BlockRoot(genesis.Block)
+	if err != nil {
+		t.Error(err)
+	}
+	st := testutil.NewBeaconState()
+	if err := service.beaconDB.SaveState(ctx, st.Copy(), validGenesisRoot); err != nil {
+		t.Fatal(err)
+	}
+	roots, err := blockTree1(db, validGenesisRoot[:])
+	if err != nil {
+		t.Fatal(err)
+	}
+	random := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 1, ParentRoot: validGenesisRoot[:]}}
+	if err := db.SaveBlock(ctx, random); err != nil {
+		t.Error(err)
+	}
+	randomParentRoot, err := stateutil.BlockRoot(random.Block)
+	if err != nil {
+		t.Error(err)
+	}
+	if err := service.beaconDB.SaveStateSummary(ctx, &pb.StateSummary{Slot: st.Slot(), Root: randomParentRoot[:]}); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveState(ctx, st.Copy(), randomParentRoot); err != nil {
+		t.Fatal(err)
+	}
+	randomParentRoot2 := roots[1]
+	if err := service.beaconDB.SaveStateSummary(ctx, &pb.StateSummary{Slot: st.Slot(), Root: randomParentRoot2[:]}); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveState(ctx, st.Copy(), bytesutil.ToBytes32(randomParentRoot2)); err != nil {
+		t.Fatal(err)
+	}
+
+	tests := []struct {
+		name          string
+		blk           *ethpb.BeaconBlock
+		s             *stateTrie.BeaconState
+		time          uint64
+		wantErrString string
+	}{
+		{
+			name:          "parent block root does not have a state",
+			blk:           &ethpb.BeaconBlock{},
+			s:             st.Copy(),
+			wantErrString: "could not reconstruct parent state",
+		},
+		{
+			name:          "block is from the future",
+			blk:           &ethpb.BeaconBlock{ParentRoot: randomParentRoot[:], Slot: params.BeaconConfig().FarFutureEpoch},
+			s:             st.Copy(),
+			wantErrString: "far distant future",
+		},
+		{
+			name:          "could not get finalized block",
+			blk:           &ethpb.BeaconBlock{ParentRoot: randomParentRoot[:]},
+			s:             st.Copy(),
+			wantErrString: "block from slot 0 is not a descendent of the current finalized block",
+		},
+		{
+			name:          "same slot as finalized block",
+			blk:           &ethpb.BeaconBlock{Slot: 0, ParentRoot: randomParentRoot2},
+			s:             st.Copy(),
+			wantErrString: "block is equal or earlier than finalized block, slot 0 < slot 0",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			service.justifiedCheckpt = &ethpb.Checkpoint{Root: validGenesisRoot[:]}
+			service.bestJustifiedCheckpt = &ethpb.Checkpoint{Root: validGenesisRoot[:]}
+			service.finalizedCheckpt = &ethpb.Checkpoint{Root: validGenesisRoot[:]}
+			service.prevFinalizedCheckpt = &ethpb.Checkpoint{Root: validGenesisRoot[:]}
+			service.finalizedCheckpt.Root = roots[0]
+
+			root, err := stateutil.BlockRoot(tt.blk)
+			if err != nil {
+				t.Error(err)
+			}
+			_, err = service.onBlock(ctx, &ethpb.SignedBeaconBlock{Block: tt.blk}, root)
+			if err == nil || !strings.Contains(err.Error(), tt.wantErrString) {
+				t.Errorf("Store.OnBlock() error = %v, wantErr = %v", err, tt.wantErrString)
+			}
+		})
+	}
+}
+
+func TestRemoveStateSinceLastFinalized_EmptyStartSlot(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+	params.UseMinimalConfig()
+	defer params.UseMainnetConfig()
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	service.genesisTime = time.Now()
+
+	update, err := service.shouldUpdateCurrentJustified(ctx, &ethpb.Checkpoint{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !update {
+		t.Error("Should be able to update justified, received false")
+	}
+	lastJustifiedBlk := testutil.NewBeaconBlock()
+	lastJustifiedBlk.Block.ParentRoot = bytesutil.PadTo([]byte{'G'}, 32)
+	lastJustifiedRoot, err := stateutil.BlockRoot(lastJustifiedBlk.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	newJustifiedBlk := testutil.NewBeaconBlock()
+	newJustifiedBlk.Block.Slot = 1
+	newJustifiedBlk.Block.ParentRoot = bytesutil.PadTo(lastJustifiedRoot[:], 32)
+	newJustifiedRoot, err := stateutil.BlockRoot(newJustifiedBlk.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveBlock(ctx, newJustifiedBlk); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveBlock(ctx, lastJustifiedBlk); err != nil {
+		t.Fatal(err)
+	}
+
+	diff := (params.BeaconConfig().SlotsPerEpoch - 1) * params.BeaconConfig().SecondsPerSlot
+	service.genesisTime = time.Unix(time.Now().Unix()-int64(diff), 0)
+	service.justifiedCheckpt = &ethpb.Checkpoint{Root: lastJustifiedRoot[:]}
+	update, err = service.shouldUpdateCurrentJustified(ctx, &ethpb.Checkpoint{Root: newJustifiedRoot[:]})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !update {
+		t.Error("Should be able to update justified, received false")
+	}
+}
+
+func TestShouldUpdateJustified_ReturnFalse(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+	params.UseMinimalConfig()
+	defer params.UseMainnetConfig()
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	lastJustifiedBlk := testutil.NewBeaconBlock()
+	lastJustifiedBlk.Block.ParentRoot = bytesutil.PadTo([]byte{'G'}, 32)
+	lastJustifiedRoot, err := stateutil.BlockRoot(lastJustifiedBlk.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	newJustifiedBlk := testutil.NewBeaconBlock()
+	newJustifiedBlk.Block.ParentRoot = bytesutil.PadTo(lastJustifiedRoot[:], 32)
+	newJustifiedRoot, err := stateutil.BlockRoot(newJustifiedBlk.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveBlock(ctx, newJustifiedBlk); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveBlock(ctx, lastJustifiedBlk); err != nil {
+		t.Fatal(err)
+	}
+
+	diff := (params.BeaconConfig().SlotsPerEpoch - 1) * params.BeaconConfig().SecondsPerSlot
+	service.genesisTime = time.Unix(time.Now().Unix()-int64(diff), 0)
+	service.justifiedCheckpt = &ethpb.Checkpoint{Root: lastJustifiedRoot[:]}
+
+	update, err := service.shouldUpdateCurrentJustified(ctx, &ethpb.Checkpoint{Root: newJustifiedRoot[:]})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if update {
+		t.Error("Should not be able to update justified, received true")
+	}
+}
+
+func TestCachedPreState_CanGetFromStateSummary(t *testing.T) {
+	resetCfg := featureconfig.InitWithReset(&featureconfig.Flags{NewStateMgmt: true})
+	defer resetCfg()
+
+	ctx := context.Background()
+	db, sc := testDB.SetupDB(t)
+
+	cfg := &Config{
+		BeaconDB: db,
+		StateGen: stategen.New(db, sc),
+	}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	s, err := stateTrie.InitializeFromProto(&pb.BeaconState{Slot: 1, GenesisValidatorsRoot: params.BeaconConfig().ZeroHash[:]})
+	if err != nil {
+		t.Fatal(err)
+	}
+	r := [32]byte{'A'}
+	b := &ethpb.BeaconBlock{Slot: 1, ParentRoot: r[:]}
+	if err := service.beaconDB.SaveStateSummary(ctx, &pb.StateSummary{Slot: 1, Root: r[:]}); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.stateGen.SaveState(ctx, r, s); err != nil {
+		t.Fatal(err)
+	}
+
+	received, err := service.verifyBlkPreState(ctx, b)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(s.InnerStateUnsafe(), received.InnerStateUnsafe()) {
+		t.Error("cached state not the same")
+	}
+}
+
+func TestCachedPreState_CanGetFromDB(t *testing.T) {
+	resetCfg := featureconfig.InitWithReset(&featureconfig.Flags{NewStateMgmt: true})
+	defer resetCfg()
+
+	ctx := context.Background()
+	db, sc := testDB.SetupDB(t)
+
+	cfg := &Config{
+		BeaconDB: db,
+		StateGen: stategen.New(db, sc),
+	}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	r := [32]byte{'A'}
+	b := &ethpb.BeaconBlock{Slot: 1, ParentRoot: r[:]}
+
+	service.finalizedCheckpt = &ethpb.Checkpoint{Root: r[:]}
+	_, err = service.verifyBlkPreState(ctx, b)
+	wanted := "could not reconstruct parent state"
+	if err.Error() != wanted {
+		t.Error("Did not get wanted error")
+	}
+
+	s, err := stateTrie.InitializeFromProto(&pb.BeaconState{Slot: 1})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := service.beaconDB.SaveStateSummary(ctx, &pb.StateSummary{Slot: 1, Root: r[:]}); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.stateGen.SaveState(ctx, r, s); err != nil {
+		t.Fatal(err)
+	}
+
+	received, err := service.verifyBlkPreState(ctx, b)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s.Slot() != received.Slot() {
+		t.Error("cached state not the same")
+	}
+}
+
+func TestUpdateJustified_CouldUpdateBest(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	signedBlock := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{}}
+	if err := db.SaveBlock(ctx, signedBlock); err != nil {
+		t.Fatal(err)
+	}
+	r, err := stateutil.BlockRoot(signedBlock.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	service.justifiedCheckpt = &ethpb.Checkpoint{Root: []byte{'A'}}
+	service.bestJustifiedCheckpt = &ethpb.Checkpoint{Root: []byte{'A'}}
+	st := testutil.NewBeaconState()
+	service.initSyncState[r] = st.Copy()
+	if err := db.SaveState(ctx, st.Copy(), r); err != nil {
+		t.Fatal(err)
+	}
+
+	// Could update
+	s := testutil.NewBeaconState()
+	if err := s.SetCurrentJustifiedCheckpoint(&ethpb.Checkpoint{Epoch: 1, Root: r[:]}); err != nil {
+		t.Fatal(err)
+	}
+	if err := service.updateJustified(context.Background(), s); err != nil {
+		t.Fatal(err)
+	}
+
+	if service.bestJustifiedCheckpt.Epoch != s.CurrentJustifiedCheckpoint().Epoch {
+		t.Error("Incorrect justified epoch in service")
+	}
+
+	// Could not update
+	service.bestJustifiedCheckpt.Epoch = 2
+	if err := service.updateJustified(context.Background(), s); err != nil {
+		t.Fatal(err)
+	}
+
+	if service.bestJustifiedCheckpt.Epoch != 2 {
+		t.Error("Incorrect justified epoch in service")
+	}
+}
+
+func TestFillForkChoiceMissingBlocks_CanSave(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	service.forkChoiceStore = protoarray.New(0, 0, [32]byte{'A'})
+	service.finalizedCheckpt = &ethpb.Checkpoint{}
+
+	genesisStateRoot := [32]byte{}
+	genesis := blocks.NewGenesisBlock(genesisStateRoot[:])
+	if err := db.SaveBlock(ctx, genesis); err != nil {
+		t.Error(err)
+	}
+	validGenesisRoot, err := stateutil.BlockRoot(genesis.Block)
+	if err != nil {
+		t.Error(err)
+	}
+	st := testutil.NewBeaconState()
+
+	if err := service.beaconDB.SaveState(ctx, st.Copy(), validGenesisRoot); err != nil {
+		t.Fatal(err)
+	}
+	roots, err := blockTree1(db, validGenesisRoot[:])
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	beaconState, _ := testutil.DeterministicGenesisState(t, 32)
+	block := &ethpb.BeaconBlock{Slot: 9, ParentRoot: roots[8], Body: &ethpb.BeaconBlockBody{Graffiti: []byte{}}}
+	if err := service.fillInForkChoiceMissingBlocks(context.Background(), block, beaconState); err != nil {
+		t.Fatal(err)
+	}
+
+	// 5 nodes from the block tree 1. B0 - B3 - B4 - B6 - B8
+	if len(service.forkChoiceStore.Nodes()) != 5 {
+		t.Error("Miss match nodes")
+	}
+
+	if !service.forkChoiceStore.HasNode(bytesutil.ToBytes32(roots[4])) {
+		t.Error("Didn't save node")
+	}
+	if !service.forkChoiceStore.HasNode(bytesutil.ToBytes32(roots[6])) {
+		t.Error("Didn't save node")
+	}
+	if !service.forkChoiceStore.HasNode(bytesutil.ToBytes32(roots[8])) {
+		t.Error("Didn't save node")
+	}
+}
+
+func TestFillForkChoiceMissingBlocks_FilterFinalized(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	service.forkChoiceStore = protoarray.New(0, 0, [32]byte{'A'})
+	// Set finalized epoch to 1.
+	service.finalizedCheckpt = &ethpb.Checkpoint{Epoch: 1}
+
+	genesisStateRoot := [32]byte{}
+	genesis := blocks.NewGenesisBlock(genesisStateRoot[:])
+	if err := db.SaveBlock(ctx, genesis); err != nil {
+		t.Error(err)
+	}
+	validGenesisRoot, err := stateutil.BlockRoot(genesis.Block)
+	if err != nil {
+		t.Error(err)
+	}
+	st := testutil.NewBeaconState()
+
+	if err := service.beaconDB.SaveState(ctx, st.Copy(), validGenesisRoot); err != nil {
+		t.Fatal(err)
+	}
+
+	// Define a tree branch, slot 63 <- 64 <- 65
+	b63 := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 63, Body: &ethpb.BeaconBlockBody{}}}
+	if err := service.beaconDB.SaveBlock(ctx, b63); err != nil {
+		t.Fatal(err)
+	}
+	r63, err := stateutil.BlockRoot(b63.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	b64 := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 64, ParentRoot: r63[:], Body: &ethpb.BeaconBlockBody{}}}
+	if err := service.beaconDB.SaveBlock(ctx, b64); err != nil {
+		t.Fatal(err)
+	}
+	r64, err := stateutil.BlockRoot(b64.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	b65 := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 65, ParentRoot: r64[:], Body: &ethpb.BeaconBlockBody{}}}
+	if err := service.beaconDB.SaveBlock(ctx, b65); err != nil {
+		t.Fatal(err)
+	}
+
+	beaconState, _ := testutil.DeterministicGenesisState(t, 32)
+	if err := service.fillInForkChoiceMissingBlocks(context.Background(), b65.Block, beaconState); err != nil {
+		t.Fatal(err)
+	}
+
+	// There should be 2 nodes, block 65 and block 64.
+	if len(service.forkChoiceStore.Nodes()) != 2 {
+		t.Error("Miss match nodes")
+	}
+
+	// Block with slot 63 should be in fork choice because it's less than finalized epoch 1.
+	if !service.forkChoiceStore.HasNode(r63) {
+		t.Error("Didn't save node")
+	}
+}
+
+// blockTree1 constructs the following tree:
+//    /- B1
+// B0           /- B5 - B7
+//    \- B3 - B4 - B6 - B8
+// (B1, and B3 are all from the same slots)
+func blockTree1(db db.Database, genesisRoot []byte) ([][]byte, error) {
+	b0 := &ethpb.BeaconBlock{Slot: 0, ParentRoot: genesisRoot}
+	r0, err := ssz.HashTreeRoot(b0)
+	if err != nil {
+		return nil, err
+	}
+	b1 := &ethpb.BeaconBlock{Slot: 1, ParentRoot: r0[:]}
+	r1, err := ssz.HashTreeRoot(b1)
+	if err != nil {
+		return nil, err
+	}
+	b3 := &ethpb.BeaconBlock{Slot: 3, ParentRoot: r0[:]}
+	r3, err := ssz.HashTreeRoot(b3)
+	if err != nil {
+		return nil, err
+	}
+	b4 := &ethpb.BeaconBlock{Slot: 4, ParentRoot: r3[:]}
+	r4, err := ssz.HashTreeRoot(b4)
+	if err != nil {
+		return nil, err
+	}
+	b5 := &ethpb.BeaconBlock{Slot: 5, ParentRoot: r4[:]}
+	r5, err := ssz.HashTreeRoot(b5)
+	if err != nil {
+		return nil, err
+	}
+	b6 := &ethpb.BeaconBlock{Slot: 6, ParentRoot: r4[:]}
+	r6, err := ssz.HashTreeRoot(b6)
+	if err != nil {
+		return nil, err
+	}
+	b7 := &ethpb.BeaconBlock{Slot: 7, ParentRoot: r5[:]}
+	r7, err := ssz.HashTreeRoot(b7)
+	if err != nil {
+		return nil, err
+	}
+	b8 := &ethpb.BeaconBlock{Slot: 8, ParentRoot: r6[:]}
+	r8, err := ssz.HashTreeRoot(b8)
+	if err != nil {
+		return nil, err
+	}
+	st := testutil.NewBeaconState()
+
+	for _, b := range []*ethpb.BeaconBlock{b0, b1, b3, b4, b5, b6, b7, b8} {
+		beaconBlock := testutil.NewBeaconBlock()
+		beaconBlock.Block.Slot = b.Slot
+		beaconBlock.Block.ParentRoot = bytesutil.PadTo(b.ParentRoot, 32)
+		beaconBlock.Block.Body = &ethpb.BeaconBlockBody{}
+		if err := db.SaveBlock(context.Background(), beaconBlock); err != nil {
+			return nil, err
+		}
+		if err := db.SaveState(context.Background(), st.Copy(), bytesutil.ToBytes32(beaconBlock.Block.ParentRoot)); err != nil {
+			return nil, err
+		}
+	}
+	if err := db.SaveState(context.Background(), st.Copy(), r1); err != nil {
+		return nil, err
+	}
+	if err := db.SaveState(context.Background(), st.Copy(), r7); err != nil {
+		return nil, err
+	}
+	if err := db.SaveState(context.Background(), st.Copy(), r8); err != nil {
+		return nil, err
+	}
+	return [][]byte{r0[:], r1[:], nil, r3[:], r4[:], r5[:], r6[:], r7[:], r8[:]}, nil
+}
+
+func TestCurrentSlot_HandlesOverflow(t *testing.T) {
+	svc := Service{genesisTime: roughtime.Now().Add(1 * time.Hour)}
+
+	slot := svc.CurrentSlot()
+
+	if slot != 0 {
+		t.Fatalf("Expected slot to be 0, got %d", slot)
+	}
+}
+
+func TestAncestor_HandleSkipSlot(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+
+	cfg := &Config{BeaconDB: db}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	b1 := &ethpb.BeaconBlock{Slot: 1, ParentRoot: []byte{'a'}}
+	r1, err := ssz.HashTreeRoot(b1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	b100 := &ethpb.BeaconBlock{Slot: 100, ParentRoot: r1[:]}
+	r100, err := ssz.HashTreeRoot(b100)
+	if err != nil {
+		t.Fatal(err)
+	}
+	b200 := &ethpb.BeaconBlock{Slot: 200, ParentRoot: r100[:]}
+	r200, err := ssz.HashTreeRoot(b200)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, b := range []*ethpb.BeaconBlock{b1, b100, b200} {
+		beaconBlock := testutil.NewBeaconBlock()
+		beaconBlock.Block.Slot = b.Slot
+		beaconBlock.Block.ParentRoot = bytesutil.PadTo(b.ParentRoot, 32)
+		beaconBlock.Block.Body = &ethpb.BeaconBlockBody{}
+		if err := db.SaveBlock(context.Background(), beaconBlock); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	// Slots 100 to 200 are skip slots. Requesting root at 150 will yield root at 100. The last physical block.
+	r, err := service.ancestor(context.Background(), r200[:], 150)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if bytesutil.ToBytes32(r) != r100 {
+		t.Error("Did not get correct root")
+	}
+
+	// Slots 1 to 100 are skip slots. Requesting root at 50 will yield root at 1. The last physical block.
+	r, err = service.ancestor(context.Background(), r200[:], 50)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if bytesutil.ToBytes32(r) != r1 {
+		t.Error("Did not get correct root")
+	}
+}
+
+func TestEnsureRootNotZeroHashes(t *testing.T) {
+	ctx := context.Background()
+	cfg := &Config{}
+	service, err := NewService(ctx, cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	service.genesisRoot = [32]byte{'a'}
+
+	r := service.ensureRootNotZeros(params.BeaconConfig().ZeroHash)
+	if r != service.genesisRoot {
+		t.Error("Did not get wanted justified root")
+	}
+	root := [32]byte{'b'}
+	r = service.ensureRootNotZeros(root)
+	if r != root {
+		t.Error("Did not get wanted justified root")
+	}
+}
+
+func TestFinalizedImpliesNewJustified(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	ctx := context.Background()
+	type args struct {
+		cachedCheckPoint        *ethpb.Checkpoint
+		stateCheckPoint         *ethpb.Checkpoint
+		diffFinalizedCheckPoint bool
+	}
+	tests := []struct {
+		name string
+		args args
+		want *ethpb.Checkpoint
+	}{
+		{
+			name: "Same justified, do nothing",
+			args: args{
+				cachedCheckPoint: &ethpb.Checkpoint{Epoch: 1, Root: []byte{'a'}},
+				stateCheckPoint:  &ethpb.Checkpoint{Epoch: 1, Root: []byte{'a'}},
+			},
+			want: &ethpb.Checkpoint{Epoch: 1, Root: []byte{'a'}},
+		},
+		{
+			name: "Different justified, higher epoch, cache new justified",
+			args: args{
+				cachedCheckPoint: &ethpb.Checkpoint{Epoch: 1, Root: []byte{'a'}},
+				stateCheckPoint:  &ethpb.Checkpoint{Epoch: 2, Root: []byte{'b'}},
+			},
+			want: &ethpb.Checkpoint{Epoch: 2, Root: []byte{'b'}},
+		},
+		{
+			name: "finalized has different justified, cache new justified",
+			args: args{
+				cachedCheckPoint:        &ethpb.Checkpoint{Epoch: 1, Root: []byte{'a'}},
+				stateCheckPoint:         &ethpb.Checkpoint{Epoch: 1, Root: []byte{'b'}},
+				diffFinalizedCheckPoint: true,
+			},
+			want: &ethpb.Checkpoint{Epoch: 1, Root: []byte{'b'}},
+		},
+	}
+	for _, test := range tests {
+		beaconState := testutil.NewBeaconState()
+		if err := beaconState.SetCurrentJustifiedCheckpoint(test.args.stateCheckPoint); err != nil {
+			t.Fatal(err)
+		}
+		service, err := NewService(ctx, &Config{BeaconDB: db, StateGen: stategen.New(db, sc)})
+		if err != nil {
+			t.Fatal(err)
+		}
+		service.justifiedCheckpt = test.args.cachedCheckPoint
+		if err := service.beaconDB.SaveStateSummary(ctx, &pb.StateSummary{Root: bytesutil.PadTo(test.want.Root, 32)}); err != nil {
+			t.Fatal(err)
+		}
+		genesisState := testutil.NewBeaconState()
+		if err := service.beaconDB.SaveState(ctx, genesisState, bytesutil.ToBytes32(test.want.Root)); err != nil {
+			t.Fatal(err)
+		}
+
+		if test.args.diffFinalizedCheckPoint {
+			b1 := &ethpb.BeaconBlock{Slot: 1, ParentRoot: []byte{'a'}}
+			r1, err := ssz.HashTreeRoot(b1)
+			if err != nil {
+				t.Fatal(err)
+			}
+			b100 := &ethpb.BeaconBlock{Slot: 100, ParentRoot: r1[:]}
+			r100, err := ssz.HashTreeRoot(b100)
+			if err != nil {
+				t.Fatal(err)
+			}
+			for _, b := range []*ethpb.BeaconBlock{b1, b100} {
+				beaconBlock := testutil.NewBeaconBlock()
+				beaconBlock.Block.Slot = b.Slot
+				beaconBlock.Block.ParentRoot = bytesutil.PadTo(b.ParentRoot, 32)
+				if err := service.beaconDB.SaveBlock(context.Background(), beaconBlock); err != nil {
+					t.Fatal(err)
+				}
+			}
+			service.finalizedCheckpt = &ethpb.Checkpoint{Root: []byte{'c'}, Epoch: 1}
+			service.justifiedCheckpt.Root = r100[:]
+		}
+
+		if err := service.finalizedImpliesNewJustified(ctx, beaconState); err != nil {
+			t.Fatal(err)
+		}
+		if !attestationutil.CheckPointIsEqual(test.want, service.justifiedCheckpt) {
+			t.Error("Did not get wanted check point")
+		}
+	}
+}

beacon-chain/blockchain/receive_attestation.go

@@ -0,0 +1,149 @@
+package blockchain
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/pkg/errors"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/featureconfig"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/roughtime"
+	"github.com/prysmaticlabs/prysm/shared/slotutil"
+	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
+)
+
+// AttestationReceiver interface defines the methods of chain service receive and processing new attestations.
+type AttestationReceiver interface {
+	ReceiveAttestationNoPubsub(ctx context.Context, att *ethpb.Attestation) error
+	IsValidAttestation(ctx context.Context, att *ethpb.Attestation) bool
+	AttestationPreState(ctx context.Context, att *ethpb.Attestation) (*state.BeaconState, error)
+}
+
+// ReceiveAttestationNoPubsub is a function that defines the operations that are performed on
+// attestation that is received from regular sync. The operations consist of:
+//  1. Validate attestation, update validator's latest vote
+//  2. Apply fork choice to the processed attestation
+//  3. Save latest head info
+func (s *Service) ReceiveAttestationNoPubsub(ctx context.Context, att *ethpb.Attestation) error {
+	ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.ReceiveAttestationNoPubsub")
+	defer span.End()
+
+	_, err := s.onAttestation(ctx, att)
+	if err != nil {
+		return errors.Wrap(err, "could not process attestation")
+	}
+
+	if !featureconfig.Get().DisableUpdateHeadPerAttestation {
+		// This updates fork choice head, if a new head could not be updated due to
+		// long range or intermediate forking. It simply logs a warning and returns nil
+		// as that's more appropriate than returning errors.
+		if err := s.updateHead(ctx, s.getJustifiedBalances()); err != nil {
+			log.Warnf("Resolving fork due to new attestation: %v", err)
+			return nil
+		}
+	}
+
+	return nil
+}
+
+// IsValidAttestation returns true if the attestation can be verified against its pre-state.
+func (s *Service) IsValidAttestation(ctx context.Context, att *ethpb.Attestation) bool {
+	baseState, err := s.AttestationPreState(ctx, att)
+	if err != nil {
+		log.WithError(err).Error("Failed to get attestation pre state")
+		return false
+	}
+
+	if err := blocks.VerifyAttestation(ctx, baseState, att); err != nil {
+		log.WithError(err).Error("Failed to validate attestation")
+		return false
+	}
+
+	return true
+}
+
+// AttestationPreState returns the pre state of attestation.
+func (s *Service) AttestationPreState(ctx context.Context, att *ethpb.Attestation) (*state.BeaconState, error) {
+	return s.getAttPreState(ctx, att.Data.Target)
+}
+
+// This processes attestations from the attestation pool to account for validator votes and fork choice.
+func (s *Service) processAttestation(subscribedToStateEvents chan struct{}) {
+	// Wait for state to be initialized.
+	stateChannel := make(chan *feed.Event, 1)
+	stateSub := s.stateNotifier.StateFeed().Subscribe(stateChannel)
+	subscribedToStateEvents <- struct{}{}
+	<-stateChannel
+	stateSub.Unsubscribe()
+
+	st := slotutil.GetSlotTicker(s.genesisTime, params.BeaconConfig().SecondsPerSlot)
+	for {
+		select {
+		case <-s.ctx.Done():
+			return
+		case <-st.C():
+			ctx := context.Background()
+			atts := s.attPool.ForkchoiceAttestations()
+			for _, a := range atts {
+				// Based on the spec, don't process the attestation until the subsequent slot.
+				// This delays consideration in the fork choice until their slot is in the past.
+				// https://github.com/ethereum/eth2.0-specs/blob/dev/specs/phase0/fork-choice.md#validate_on_attestation
+				nextSlot := a.Data.Slot + 1
+				if err := helpers.VerifySlotTime(uint64(s.genesisTime.Unix()), nextSlot, params.BeaconNetworkConfig().MaximumGossipClockDisparity); err != nil {
+					continue
+				}
+
+				hasState := s.stateGen.StateSummaryExists(ctx, bytesutil.ToBytes32(a.Data.BeaconBlockRoot))
+				hasBlock := s.hasBlock(ctx, bytesutil.ToBytes32(a.Data.BeaconBlockRoot))
+				if !(hasState && hasBlock) {
+					continue
+				}
+
+				if err := s.attPool.DeleteForkchoiceAttestation(a); err != nil {
+					log.WithError(err).Error("Could not delete fork choice attestation in pool")
+				}
+
+				if !s.verifyCheckpointEpoch(a.Data.Target) {
+					continue
+				}
+
+				if err := s.ReceiveAttestationNoPubsub(ctx, a); err != nil {
+					log.WithFields(logrus.Fields{
+						"slot":             a.Data.Slot,
+						"committeeIndex":   a.Data.CommitteeIndex,
+						"beaconBlockRoot":  fmt.Sprintf("%#x", bytesutil.Trunc(a.Data.BeaconBlockRoot)),
+						"targetRoot":       fmt.Sprintf("%#x", bytesutil.Trunc(a.Data.Target.Root)),
+						"aggregationCount": a.AggregationBits.Count(),
+					}).WithError(err).Warn("Could not receive attestation in chain service")
+				}
+			}
+		}
+	}
+}
+
+// This verifies the epoch of input checkpoint is within current epoch and previous epoch
+// with respect to current time. Returns true if it's within, false if it's not.
+func (s *Service) verifyCheckpointEpoch(c *ethpb.Checkpoint) bool {
+	now := uint64(roughtime.Now().Unix())
+	genesisTime := uint64(s.genesisTime.Unix())
+	currentSlot := (now - genesisTime) / params.BeaconConfig().SecondsPerSlot
+	currentEpoch := helpers.SlotToEpoch(currentSlot)
+
+	var prevEpoch uint64
+	if currentEpoch > 1 {
+		prevEpoch = currentEpoch - 1
+	}
+
+	if c.Epoch != prevEpoch && c.Epoch != currentEpoch {
+		return false
+	}
+
+	return true
+}

beacon-chain/blockchain/receive_attestation_test.go

@@ -0,0 +1,26 @@
+package blockchain
+
+import (
+	"testing"
+	"time"
+
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
+)
+
+func TestVerifyCheckpointEpoch_Ok(t *testing.T) {
+	helpers.ClearCache()
+	db, sc := testDB.SetupDB(t)
+
+	chainService := setupBeaconChain(t, db, sc)
+	chainService.genesisTime = time.Now()
+
+	if !chainService.verifyCheckpointEpoch(&ethpb.Checkpoint{}) {
+		t.Error("Wanted true, got false")
+	}
+
+	if chainService.verifyCheckpointEpoch(&ethpb.Checkpoint{Epoch: 1}) {
+		t.Error("Wanted false, got true")
+	}
+}

beacon-chain/blockchain/receive_block.go

@@ -0,0 +1,179 @@
+package blockchain
+
+import (
+	"bytes"
+	"context"
+	"encoding/hex"
+
+	"github.com/pkg/errors"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
+	statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/shared/featureconfig"
+	"github.com/prysmaticlabs/prysm/shared/traceutil"
+	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
+)
+
+// BlockReceiver interface defines the methods of chain service receive and processing new blocks.
+type BlockReceiver interface {
+	ReceiveBlock(ctx context.Context, block *ethpb.SignedBeaconBlock, blockRoot [32]byte) error
+	ReceiveBlockNoPubsub(ctx context.Context, block *ethpb.SignedBeaconBlock, blockRoot [32]byte) error
+	ReceiveBlockInitialSync(ctx context.Context, block *ethpb.SignedBeaconBlock, blockRoot [32]byte) error
+	HasInitSyncBlock(root [32]byte) bool
+}
+
+// ReceiveBlock is a function that defines the operations that are performed on
+// blocks that is received from rpc service. The operations consists of:
+//   1. Gossip block to other peers
+//   2. Validate block, apply state transition and update check points
+//   3. Apply fork choice to the processed block
+//   4. Save latest head info
+func (s *Service) ReceiveBlock(ctx context.Context, block *ethpb.SignedBeaconBlock, blockRoot [32]byte) error {
+	ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.ReceiveBlock")
+	defer span.End()
+
+	// Broadcast the new block to the network.
+	if err := s.p2p.Broadcast(ctx, block); err != nil {
+		return errors.Wrap(err, "could not broadcast block")
+	}
+	log.WithFields(logrus.Fields{
+		"blockRoot": hex.EncodeToString(blockRoot[:]),
+	}).Debug("Broadcasting block")
+
+	if err := captureSentTimeMetric(uint64(s.genesisTime.Unix()), block.Block.Slot); err != nil {
+		// If a node fails to capture metric, this shouldn't cause the block processing to fail.
+		log.Warnf("Could not capture block sent time metric: %v", err)
+	}
+
+	if err := s.ReceiveBlockNoPubsub(ctx, block, blockRoot); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// ReceiveBlockNoPubsub is a function that defines the the operations (minus pubsub)
+// that are performed on blocks that is received from regular sync service. The operations consists of:
+//   1. Validate block, apply state transition and update check points
+//   2. Apply fork choice to the processed block
+//   3. Save latest head info
+func (s *Service) ReceiveBlockNoPubsub(ctx context.Context, block *ethpb.SignedBeaconBlock, blockRoot [32]byte) error {
+	ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.ReceiveBlockNoPubsub")
+	defer span.End()
+	blockCopy := stateTrie.CopySignedBeaconBlock(block)
+
+	// Apply state transition on the new block.
+	_, err := s.onBlock(ctx, blockCopy, blockRoot)
+	if err != nil {
+		err := errors.Wrap(err, "could not process block")
+		traceutil.AnnotateError(span, err)
+		return err
+	}
+
+	// Add attestations from the block to the pool for fork choice.
+	if err := s.attPool.SaveBlockAttestations(blockCopy.Block.Body.Attestations); err != nil {
+		log.Errorf("Could not save attestation for fork choice: %v", err)
+		return nil
+	}
+	for _, exit := range block.Block.Body.VoluntaryExits {
+		s.exitPool.MarkIncluded(exit)
+	}
+
+	s.epochParticipationLock.Lock()
+	defer s.epochParticipationLock.Unlock()
+	s.epochParticipation[helpers.SlotToEpoch(blockCopy.Block.Slot)] = precompute.Balances
+
+	if featureconfig.Get().DisableForkChoice && block.Block.Slot > s.headSlot() {
+		if err := s.saveHead(ctx, blockRoot); err != nil {
+			return errors.Wrap(err, "could not save head")
+		}
+	} else {
+		if err := s.updateHead(ctx, s.getJustifiedBalances()); err != nil {
+			return errors.Wrap(err, "could not save head")
+		}
+	}
+
+	// Send notification of the processed block to the state feed.
+	s.stateNotifier.StateFeed().Send(&feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			Slot:      blockCopy.Block.Slot,
+			BlockRoot: blockRoot,
+			Verified:  true,
+		},
+	})
+
+	// Reports on block and fork choice metrics.
+	reportSlotMetrics(blockCopy.Block.Slot, s.headSlot(), s.CurrentSlot(), s.finalizedCheckpt)
+
+	// Log block sync status.
+	logBlockSyncStatus(blockCopy.Block, blockRoot, s.finalizedCheckpt)
+
+	// Log state transition data.
+	logStateTransitionData(blockCopy.Block)
+
+	return nil
+}
+
+// ReceiveBlockInitialSync processes the input block for the purpose of initial syncing.
+// This method should only be used on blocks during initial syncing phase.
+func (s *Service) ReceiveBlockInitialSync(ctx context.Context, block *ethpb.SignedBeaconBlock, blockRoot [32]byte) error {
+	ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.ReceiveBlockNoVerify")
+	defer span.End()
+	blockCopy := stateTrie.CopySignedBeaconBlock(block)
+
+	// Apply state transition on the incoming newly received blockCopy without verifying its BLS contents.
+	if err := s.onBlockInitialSyncStateTransition(ctx, blockCopy, blockRoot); err != nil {
+		err := errors.Wrap(err, "could not process block")
+		traceutil.AnnotateError(span, err)
+		return err
+	}
+
+	cachedHeadRoot, err := s.HeadRoot(ctx)
+	if err != nil {
+		return errors.Wrap(err, "could not get head root from cache")
+	}
+
+	if !bytes.Equal(blockRoot[:], cachedHeadRoot) {
+		if err := s.saveHeadNoDB(ctx, blockCopy, blockRoot); err != nil {
+			err := errors.Wrap(err, "could not save head")
+			traceutil.AnnotateError(span, err)
+			return err
+		}
+	}
+
+	// Send notification of the processed block to the state feed.
+	s.stateNotifier.StateFeed().Send(&feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			Slot:      blockCopy.Block.Slot,
+			BlockRoot: blockRoot,
+			Verified:  false,
+		},
+	})
+
+	// Reports on blockCopy and fork choice metrics.
+	reportSlotMetrics(blockCopy.Block.Slot, s.headSlot(), s.CurrentSlot(), s.finalizedCheckpt)
+
+	// Log state transition data.
+	log.WithFields(logrus.Fields{
+		"slot":         blockCopy.Block.Slot,
+		"attestations": len(blockCopy.Block.Body.Attestations),
+		"deposits":     len(blockCopy.Block.Body.Deposits),
+	}).Debug("Finished applying state transition")
+
+	s.epochParticipationLock.Lock()
+	defer s.epochParticipationLock.Unlock()
+	s.epochParticipation[helpers.SlotToEpoch(blockCopy.Block.Slot)] = precompute.Balances
+
+	return nil
+}
+
+// HasInitSyncBlock returns true if the block of the input root exists in initial sync blocks cache.
+func (s *Service) HasInitSyncBlock(root [32]byte) bool {
+	return s.hasInitSyncBlock(root)
+}

beacon-chain/blockchain/service.go

@@ -1,277 +1,502 @@
-// Package blockchain defines the life-cycle and status of the beacon chain
-// as well as the Ethereum Serenity beacon chain fork-choice rule based on
-// Casper Proof of Stake finality.
+// Package blockchain defines the life-cycle of the blockchain at the core of
+// eth2, including processing of new blocks and attestations using casper
+// proof of stake.
 package blockchain
 
 import (
-	"bytes"
 	"context"
 	"fmt"
-	"sort"
+	"runtime"
 	"sync"
 	"time"
 
-	"github.com/prysmaticlabs/prysm/beacon-chain/attestation"
-	b "github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
+	"github.com/pkg/errors"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
+	"github.com/prysmaticlabs/prysm/beacon-chain/cache/depositcache"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
+	statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
 	"github.com/prysmaticlabs/prysm/beacon-chain/db"
-	"github.com/prysmaticlabs/prysm/beacon-chain/operations"
+	"github.com/prysmaticlabs/prysm/beacon-chain/db/filters"
+	"github.com/prysmaticlabs/prysm/beacon-chain/flags"
+	f "github.com/prysmaticlabs/prysm/beacon-chain/forkchoice"
+	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
+	"github.com/prysmaticlabs/prysm/beacon-chain/operations/attestations"
+	"github.com/prysmaticlabs/prysm/beacon-chain/operations/slashings"
+	"github.com/prysmaticlabs/prysm/beacon-chain/operations/voluntaryexits"
+	"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
 	"github.com/prysmaticlabs/prysm/beacon-chain/powchain"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stateutil"
 	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	pbrpc "github.com/prysmaticlabs/prysm/proto/beacon/rpc/v1"
-	"github.com/prysmaticlabs/prysm/shared/event"
-	"github.com/prysmaticlabs/prysm/shared/hashutil"
-	"github.com/prysmaticlabs/prysm/shared/p2p"
-	"github.com/sirupsen/logrus"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/featureconfig"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/slotutil"
 	"go.opencensus.io/trace"
 )
 
-var log = logrus.WithField("prefix", "blockchain")
-
-// ChainFeeds interface defines the methods of the ChainService which provide
-// information feeds.
-type ChainFeeds interface {
-	StateInitializedFeed() *event.Feed
-}
-
-// ChainService represents a service that handles the internal
+// Service represents a service that handles the internal
 // logic of managing the full PoS beacon chain.
-type ChainService struct {
-	ctx                  context.Context
-	cancel               context.CancelFunc
-	beaconDB             *db.BeaconDB
-	web3Service          *powchain.Web3Service
-	attsService          attestation.TargetHandler
-	opsPoolService       operations.OperationFeeds
-	chainStartChan       chan time.Time
-	canonicalBlockFeed   *event.Feed
-	genesisTime          time.Time
-	finalizedEpoch       uint64
-	stateInitializedFeed *event.Feed
-	p2p                  p2p.Broadcaster
-	canonicalBlocks      map[uint64][]byte
-	canonicalBlocksLock  sync.RWMutex
-	receiveBlockLock     sync.Mutex
+type Service struct {
+	ctx                       context.Context
+	cancel                    context.CancelFunc
+	beaconDB                  db.HeadAccessDatabase
+	depositCache              *depositcache.DepositCache
+	chainStartFetcher         powchain.ChainStartFetcher
+	attPool                   attestations.Pool
+	slashingPool              *slashings.Pool
+	exitPool                  *voluntaryexits.Pool
+	genesisTime               time.Time
+	p2p                       p2p.Broadcaster
+	maxRoutines               int64
+	head                      *head
+	headLock                  sync.RWMutex
+	stateNotifier             statefeed.Notifier
+	genesisRoot               [32]byte
+	epochParticipation        map[uint64]*precompute.Balance
+	epochParticipationLock    sync.RWMutex
+	forkChoiceStore           f.ForkChoicer
+	justifiedCheckpt          *ethpb.Checkpoint
+	prevJustifiedCheckpt      *ethpb.Checkpoint
+	bestJustifiedCheckpt      *ethpb.Checkpoint
+	finalizedCheckpt          *ethpb.Checkpoint
+	prevFinalizedCheckpt      *ethpb.Checkpoint
+	nextEpochBoundarySlot     uint64
+	voteLock                  sync.RWMutex
+	initSyncState             map[[32]byte]*stateTrie.BeaconState
+	boundaryRoots             [][32]byte
+	initSyncStateLock         sync.RWMutex
+	checkpointState           *cache.CheckpointStateCache
+	checkpointStateLock       sync.Mutex
+	stateGen                  *stategen.State
+	opsService                *attestations.Service
+	initSyncBlocks            map[[32]byte]*ethpb.SignedBeaconBlock
+	initSyncBlocksLock        sync.RWMutex
+	recentCanonicalBlocks     map[[32]byte]bool
+	recentCanonicalBlocksLock sync.RWMutex
+	justifiedBalances         []uint64
+	justifiedBalancesLock     sync.RWMutex
 }
 
 // Config options for the service.
 type Config struct {
-	BeaconBlockBuf int
-	Web3Service    *powchain.Web3Service
-	AttsService    attestation.TargetHandler
-	BeaconDB       *db.BeaconDB
-	OpsPoolService operations.OperationFeeds
-	DevMode        bool
-	P2p            p2p.Broadcaster
+	BeaconBlockBuf    int
+	ChainStartFetcher powchain.ChainStartFetcher
+	BeaconDB          db.HeadAccessDatabase
+	DepositCache      *depositcache.DepositCache
+	AttPool           attestations.Pool
+	ExitPool          *voluntaryexits.Pool
+	SlashingPool      *slashings.Pool
+	P2p               p2p.Broadcaster
+	MaxRoutines       int64
+	StateNotifier     statefeed.Notifier
+	ForkChoiceStore   f.ForkChoicer
+	OpsService        *attestations.Service
+	StateGen          *stategen.State
 }
 
-// NewChainService instantiates a new service instance that will
+// NewService instantiates a new block service instance that will
 // be registered into a running beacon node.
-func NewChainService(ctx context.Context, cfg *Config) (*ChainService, error) {
+func NewService(ctx context.Context, cfg *Config) (*Service, error) {
 	ctx, cancel := context.WithCancel(ctx)
-	return &ChainService{
-		ctx:                  ctx,
-		cancel:               cancel,
-		beaconDB:             cfg.BeaconDB,
-		web3Service:          cfg.Web3Service,
-		opsPoolService:       cfg.OpsPoolService,
-		attsService:          cfg.AttsService,
-		canonicalBlockFeed:   new(event.Feed),
-		chainStartChan:       make(chan time.Time),
-		stateInitializedFeed: new(event.Feed),
-		p2p:                  cfg.P2p,
-		canonicalBlocks:      make(map[uint64][]byte),
+	return &Service{
+		ctx:                   ctx,
+		cancel:                cancel,
+		beaconDB:              cfg.BeaconDB,
+		depositCache:          cfg.DepositCache,
+		chainStartFetcher:     cfg.ChainStartFetcher,
+		attPool:               cfg.AttPool,
+		exitPool:              cfg.ExitPool,
+		slashingPool:          cfg.SlashingPool,
+		p2p:                   cfg.P2p,
+		maxRoutines:           cfg.MaxRoutines,
+		stateNotifier:         cfg.StateNotifier,
+		epochParticipation:    make(map[uint64]*precompute.Balance),
+		forkChoiceStore:       cfg.ForkChoiceStore,
+		initSyncState:         make(map[[32]byte]*stateTrie.BeaconState),
+		boundaryRoots:         [][32]byte{},
+		checkpointState:       cache.NewCheckpointStateCache(),
+		opsService:            cfg.OpsService,
+		stateGen:              cfg.StateGen,
+		initSyncBlocks:        make(map[[32]byte]*ethpb.SignedBeaconBlock),
+		recentCanonicalBlocks: make(map[[32]byte]bool),
+		justifiedBalances:     make([]uint64, 0),
 	}, nil
 }
 
 // Start a blockchain service's main event loop.
-func (c *ChainService) Start() {
-	beaconState, err := c.beaconDB.HeadState(c.ctx)
+func (s *Service) Start() {
+	ctx := context.TODO()
+	beaconState, err := s.beaconDB.HeadState(ctx)
 	if err != nil {
 		log.Fatalf("Could not fetch beacon state: %v", err)
 	}
+
+	// For running initial sync with state cache, in an event of restart, we use
+	// last finalized check point as start point to sync instead of head
+	// state. This is because we no longer save state every slot during sync.
+	cp, err := s.beaconDB.FinalizedCheckpoint(ctx)
+	if err != nil {
+		log.Fatalf("Could not fetch finalized cp: %v", err)
+	}
+
+	if beaconState == nil {
+		beaconState, err = s.stateGen.StateByRoot(ctx, bytesutil.ToBytes32(cp.Root))
+		if err != nil {
+			log.Fatalf("Could not fetch beacon state by root: %v", err)
+		}
+	}
+
+	// Make sure that attestation processor is subscribed and ready for state initializing event.
+	attestationProcessorSubscribed := make(chan struct{}, 1)
+
 	// If the chain has already been initialized, simply start the block processing routine.
 	if beaconState != nil {
-		log.Info("Beacon chain data already exists, starting service")
-		c.genesisTime = time.Unix(int64(beaconState.GenesisTime), 0)
-		c.finalizedEpoch = beaconState.FinalizedEpoch
+		log.Info("Blockchain data already exists in DB, initializing...")
+		s.genesisTime = time.Unix(int64(beaconState.GenesisTime()), 0)
+		s.opsService.SetGenesisTime(beaconState.GenesisTime())
+		if err := s.initializeChainInfo(ctx); err != nil {
+			log.Fatalf("Could not set up chain info: %v", err)
+		}
+
+		// We start a counter to genesis, if needed.
+		go slotutil.CountdownToGenesis(ctx, s.genesisTime, uint64(beaconState.NumValidators()))
+
+		justifiedCheckpoint, err := s.beaconDB.JustifiedCheckpoint(ctx)
+		if err != nil {
+			log.Fatalf("Could not get justified checkpoint: %v", err)
+		}
+		finalizedCheckpoint, err := s.beaconDB.FinalizedCheckpoint(ctx)
+		if err != nil {
+			log.Fatalf("Could not get finalized checkpoint: %v", err)
+		}
+
+		// Resume fork choice.
+		s.justifiedCheckpt = stateTrie.CopyCheckpoint(justifiedCheckpoint)
+		if err := s.cacheJustifiedStateBalances(ctx, bytesutil.ToBytes32(s.justifiedCheckpt.Root)); err != nil {
+			log.Fatalf("Could not cache justified state balances: %v", err)
+		}
+		s.prevJustifiedCheckpt = stateTrie.CopyCheckpoint(justifiedCheckpoint)
+		s.bestJustifiedCheckpt = stateTrie.CopyCheckpoint(justifiedCheckpoint)
+		s.finalizedCheckpt = stateTrie.CopyCheckpoint(finalizedCheckpoint)
+		s.prevFinalizedCheckpt = stateTrie.CopyCheckpoint(finalizedCheckpoint)
+		s.resumeForkChoice(justifiedCheckpoint, finalizedCheckpoint)
+
+		s.stateNotifier.StateFeed().Send(&feed.Event{
+			Type: statefeed.Initialized,
+			Data: &statefeed.InitializedData{
+				StartTime:             s.genesisTime,
+				GenesisValidatorsRoot: beaconState.GenesisValidatorRoot(),
+			},
+		})
 	} else {
-		log.Info("Waiting for ChainStart log from the Validator Deposit Contract to start the beacon chain...")
-		if c.web3Service == nil {
+		log.Info("Waiting to reach the validator deposit threshold to start the beacon chain...")
+		if s.chainStartFetcher == nil {
 			log.Fatal("Not configured web3Service for POW chain")
 			return // return need for TestStartUninitializedChainWithoutConfigPOWChain.
 		}
-		subChainStart := c.web3Service.ChainStartFeed().Subscribe(c.chainStartChan)
 		go func() {
-			genesisTime := <-c.chainStartChan
-			c.processChainStartTime(genesisTime, subChainStart)
-			return
+			stateChannel := make(chan *feed.Event, 1)
+			stateSub := s.stateNotifier.StateFeed().Subscribe(stateChannel)
+			defer stateSub.Unsubscribe()
+			<-attestationProcessorSubscribed
+			for {
+				select {
+				case event := <-stateChannel:
+					if event.Type == statefeed.ChainStarted {
+						data, ok := event.Data.(*statefeed.ChainStartedData)
+						if !ok {
+							log.Error("event data is not type *statefeed.ChainStartedData")
+							return
+						}
+						log.WithField("starttime", data.StartTime).Debug("Received chain start event")
+						s.processChainStartTime(ctx, data.StartTime)
+						return
+					}
+				case <-s.ctx.Done():
+					log.Debug("Context closed, exiting goroutine")
+					return
+				case err := <-stateSub.Err():
+					log.WithError(err).Error("Subscription to state notifier failed")
+					return
+				}
+			}
 		}()
 	}
+
+	go s.processAttestation(attestationProcessorSubscribed)
 }
 
 // processChainStartTime initializes a series of deposits from the ChainStart deposits in the eth1
 // deposit contract, initializes the beacon chain's state, and kicks off the beacon chain.
-func (c *ChainService) processChainStartTime(genesisTime time.Time, chainStartSub event.Subscription) {
-	initialDepositsData := c.web3Service.ChainStartDeposits()
-	initialDeposits := make([]*pb.Deposit, len(initialDepositsData))
-	for i := range initialDepositsData {
-		initialDeposits[i] = &pb.Deposit{DepositData: initialDepositsData[i]}
-	}
-
-	beaconState, err := c.initializeBeaconChain(genesisTime, initialDeposits, c.web3Service.ChainStartETH1Data())
+func (s *Service) processChainStartTime(ctx context.Context, genesisTime time.Time) {
+	preGenesisState := s.chainStartFetcher.PreGenesisState()
+	initializedState, err := s.initializeBeaconChain(ctx, genesisTime, preGenesisState, s.chainStartFetcher.ChainStartEth1Data())
 	if err != nil {
 		log.Fatalf("Could not initialize beacon chain: %v", err)
 	}
-	c.finalizedEpoch = beaconState.FinalizedEpoch
-	c.stateInitializedFeed.Send(genesisTime)
-	chainStartSub.Unsubscribe()
+	// We start a counter to genesis, if needed.
+	go slotutil.CountdownToGenesis(ctx, genesisTime, uint64(initializedState.NumValidators()))
+
+	// We send out a state initialized event to the rest of the services
+	// running in the beacon node.
+	s.stateNotifier.StateFeed().Send(&feed.Event{
+		Type: statefeed.Initialized,
+		Data: &statefeed.InitializedData{
+			StartTime:             genesisTime,
+			GenesisValidatorsRoot: initializedState.GenesisValidatorRoot(),
+		},
+	})
 }
 
 // initializes the state and genesis block of the beacon chain to persistent storage
 // based on a genesis timestamp value obtained from the ChainStart event emitted
 // by the ETH1.0 Deposit Contract and the POWChain service of the node.
-func (c *ChainService) initializeBeaconChain(genesisTime time.Time, deposits []*pb.Deposit,
-	eth1data *pb.Eth1Data) (*pb.BeaconState, error) {
-	ctx, span := trace.StartSpan(context.Background(), "beacon-chain.ChainService.initializeBeaconChain")
+func (s *Service) initializeBeaconChain(
+	ctx context.Context,
+	genesisTime time.Time,
+	preGenesisState *stateTrie.BeaconState,
+	eth1data *ethpb.Eth1Data) (*stateTrie.BeaconState, error) {
+	_, span := trace.StartSpan(context.Background(), "beacon-chain.Service.initializeBeaconChain")
 	defer span.End()
-	log.Info("ChainStart time reached, starting the beacon chain!")
-	c.genesisTime = genesisTime
+	s.genesisTime = genesisTime
 	unixTime := uint64(genesisTime.Unix())
-	if err := c.beaconDB.InitializeState(c.ctx, unixTime, deposits, eth1data); err != nil {
-		return nil, fmt.Errorf("could not initialize beacon state to disk: %v", err)
-	}
-	beaconState, err := c.beaconDB.HeadState(c.ctx)
+
+	genesisState, err := state.OptimizedGenesisBeaconState(unixTime, preGenesisState, eth1data)
 	if err != nil {
-		return nil, fmt.Errorf("could not attempt fetch beacon state: %v", err)
+		return nil, errors.Wrap(err, "could not initialize genesis state")
 	}
 
-	stateRoot, err := hashutil.HashProto(beaconState)
-	if err != nil {
-		return nil, fmt.Errorf("could not hash beacon state: %v", err)
-	}
-	genBlock := b.NewGenesisBlock(stateRoot[:])
-	genBlockRoot, err := hashutil.HashBeaconBlock(genBlock)
-	if err != nil {
-		return nil, fmt.Errorf("could not hash beacon block: %v", err)
+	if err := s.saveGenesisData(ctx, genesisState); err != nil {
+		return nil, errors.Wrap(err, "could not save genesis data")
 	}
 
-	// TODO(#2011): Remove this in state caching.
-	beaconState.LatestBlock = genBlock
+	log.Info("Initialized beacon chain genesis state")
 
-	if err := c.beaconDB.SaveBlock(genBlock); err != nil {
-		return nil, fmt.Errorf("could not save genesis block to disk: %v", err)
+	// Clear out all pre-genesis data now that the state is initialized.
+	s.chainStartFetcher.ClearPreGenesisData()
+
+	// Update committee shuffled indices for genesis epoch.
+	if err := helpers.UpdateCommitteeCache(genesisState, 0 /* genesis epoch */); err != nil {
+		return nil, err
 	}
-	if err := c.beaconDB.SaveAttestationTarget(ctx, &pb.AttestationTarget{
-		Slot:       genBlock.Slot,
-		BlockRoot:  genBlockRoot[:],
-		ParentRoot: genBlock.ParentRootHash32,
-	}); err != nil {
-		return nil, fmt.Errorf("failed to save attestation target: %v", err)
+	if err := helpers.UpdateProposerIndicesInCache(genesisState, 0 /* genesis epoch */); err != nil {
+		return nil, err
 	}
-	if err := c.beaconDB.UpdateChainHead(ctx, genBlock, beaconState); err != nil {
-		return nil, fmt.Errorf("could not set chain head, %v", err)
-	}
-	if err := c.beaconDB.SaveJustifiedBlock(genBlock); err != nil {
-		return nil, fmt.Errorf("could not save gensis block as justified block: %v", err)
-	}
-	if err := c.beaconDB.SaveFinalizedBlock(genBlock); err != nil {
-		return nil, fmt.Errorf("could not save gensis block as finalized block: %v", err)
-	}
-	if err := c.beaconDB.SaveJustifiedState(beaconState); err != nil {
-		return nil, fmt.Errorf("could not save gensis state as justified state: %v", err)
-	}
-	if err := c.beaconDB.SaveFinalizedState(beaconState); err != nil {
-		return nil, fmt.Errorf("could not save gensis state as finalized state: %v", err)
-	}
-	return beaconState, nil
+
+	s.opsService.SetGenesisTime(genesisState.GenesisTime())
+
+	return genesisState, nil
 }
 
 // Stop the blockchain service's main event loop and associated goroutines.
-func (c *ChainService) Stop() error {
-	defer c.cancel()
-
-	log.Info("Stopping service")
+func (s *Service) Stop() error {
+	defer s.cancel()
 	return nil
 }
 
-// Status always returns nil.
-// TODO(1202): Add service health checks.
-func (c *ChainService) Status() error {
+// Status always returns nil unless there is an error condition that causes
+// this service to be unhealthy.
+func (s *Service) Status() error {
+	if int64(runtime.NumGoroutine()) > s.maxRoutines {
+		return fmt.Errorf("too many goroutines %d", runtime.NumGoroutine())
+	}
 	return nil
 }
 
-// CanonicalBlockFeed returns a channel that is written to
-// whenever a new block is determined to be canonical in the chain.
-func (c *ChainService) CanonicalBlockFeed() *event.Feed {
-	return c.canonicalBlockFeed
+// ClearCachedStates removes all stored caches states. This is done after the node
+// is synced.
+func (s *Service) ClearCachedStates() {
+	s.initSyncState = map[[32]byte]*stateTrie.BeaconState{}
 }
 
-// StateInitializedFeed returns a feed that is written to
-// when the beacon state is first initialized.
-func (c *ChainService) StateInitializedFeed() *event.Feed {
-	return c.stateInitializedFeed
-}
-
-// ChainHeadRoot returns the hash root of the last beacon block processed by the
-// block chain service.
-func (c *ChainService) ChainHeadRoot() ([32]byte, error) {
-	head, err := c.beaconDB.ChainHead()
+// This gets called when beacon chain is first initialized to save genesis data (state, block, and more) in db.
+func (s *Service) saveGenesisData(ctx context.Context, genesisState *stateTrie.BeaconState) error {
+	stateRoot, err := genesisState.HashTreeRoot(ctx)
 	if err != nil {
-		return [32]byte{}, fmt.Errorf("could not retrieve chain head: %v", err)
+		return err
 	}
-
-	root, err := hashutil.HashBeaconBlock(head)
+	genesisBlk := blocks.NewGenesisBlock(stateRoot[:])
+	genesisBlkRoot, err := stateutil.BlockRoot(genesisBlk.Block)
 	if err != nil {
-		return [32]byte{}, fmt.Errorf("could not tree hash parent block: %v", err)
+		return errors.Wrap(err, "could not get genesis block root")
 	}
-	return root, nil
+	s.genesisRoot = genesisBlkRoot
+
+	if err := s.beaconDB.SaveBlock(ctx, genesisBlk); err != nil {
+		return errors.Wrap(err, "could not save genesis block")
+	}
+	if err := s.stateGen.SaveState(ctx, genesisBlkRoot, genesisState); err != nil {
+		return errors.Wrap(err, "could not save genesis state")
+	}
+	if err := s.beaconDB.SaveStateSummary(ctx, &pb.StateSummary{
+		Slot: 0,
+		Root: genesisBlkRoot[:],
+	}); err != nil {
+		return err
+	}
+
+	if err := s.beaconDB.SaveHeadBlockRoot(ctx, genesisBlkRoot); err != nil {
+		return errors.Wrap(err, "could not save head block root")
+	}
+	if err := s.beaconDB.SaveGenesisBlockRoot(ctx, genesisBlkRoot); err != nil {
+		return errors.Wrap(err, "could not save genesis block root")
+	}
+
+	// Finalized checkpoint at genesis is a zero hash.
+	genesisCheckpoint := genesisState.FinalizedCheckpoint()
+
+	s.justifiedCheckpt = stateTrie.CopyCheckpoint(genesisCheckpoint)
+	if err := s.cacheJustifiedStateBalances(ctx, genesisBlkRoot); err != nil {
+		return err
+	}
+	s.prevJustifiedCheckpt = stateTrie.CopyCheckpoint(genesisCheckpoint)
+	s.bestJustifiedCheckpt = stateTrie.CopyCheckpoint(genesisCheckpoint)
+	s.finalizedCheckpt = stateTrie.CopyCheckpoint(genesisCheckpoint)
+	s.prevFinalizedCheckpt = stateTrie.CopyCheckpoint(genesisCheckpoint)
+
+	if err := s.forkChoiceStore.ProcessBlock(ctx,
+		genesisBlk.Block.Slot,
+		genesisBlkRoot,
+		params.BeaconConfig().ZeroHash,
+		[32]byte{},
+		genesisCheckpoint.Epoch,
+		genesisCheckpoint.Epoch); err != nil {
+		log.Fatalf("Could not process genesis block for fork choice: %v", err)
+	}
+
+	s.setHead(genesisBlkRoot, genesisBlk, genesisState)
+
+	return nil
 }
 
-// IsCanonical returns true if the input block hash of the corresponding slot
-// is part of the canonical chain. False otherwise.
-func (c *ChainService) IsCanonical(slot uint64, hash []byte) bool {
-	c.canonicalBlocksLock.RLock()
-	defer c.canonicalBlocksLock.RUnlock()
-	if canonicalHash, ok := c.canonicalBlocks[slot]; ok {
-		return bytes.Equal(canonicalHash, hash)
+// This gets called to initialize chain info variables using the finalized checkpoint stored in DB
+func (s *Service) initializeChainInfo(ctx context.Context) error {
+	genesisBlock, err := s.beaconDB.GenesisBlock(ctx)
+	if err != nil {
+		return errors.Wrap(err, "could not get genesis block from db")
 	}
-	return false
-}
+	if genesisBlock == nil {
+		return errors.New("no genesis block in db")
+	}
+	genesisBlkRoot, err := stateutil.BlockRoot(genesisBlock.Block)
+	if err != nil {
+		return errors.Wrap(err, "could not get signing root of genesis block")
+	}
+	s.genesisRoot = genesisBlkRoot
 
-// RecentCanonicalRoots returns the latest block slot and root of the canonical block chain,
-// the block slots and roots are sorted and in descending order. Input count determines
-// the number of block slots and roots to return.
-func (c *ChainService) RecentCanonicalRoots(count uint64) []*pbrpc.BlockRoot {
-	c.canonicalBlocksLock.RLock()
-	defer c.canonicalBlocksLock.RUnlock()
-	var slots []int
-	for s := range c.canonicalBlocks {
-		slots = append(slots, int(s))
+	if flags.Get().UnsafeSync {
+		headBlock, err := s.beaconDB.HeadBlock(ctx)
+		if err != nil {
+			return errors.Wrap(err, "could not retrieve head block")
+		}
+		headRoot, err := stateutil.BlockRoot(headBlock.Block)
+		if err != nil {
+			return errors.Wrap(err, "could not hash head block")
+		}
+		headState, err := s.beaconDB.HeadState(ctx)
+		if err != nil {
+			return errors.Wrap(err, "could not retrieve head state")
+		}
+		s.setHead(headRoot, headBlock, headState)
+		return nil
 	}
 
-	// Return the all the canonical blocks if the input count is greater than
-	// the depth of the block tree.
-	totalRoots := uint64(len(slots))
-	if count > totalRoots {
-		count = totalRoots
+	finalized, err := s.beaconDB.FinalizedCheckpoint(ctx)
+	if err != nil {
+		return errors.Wrap(err, "could not get finalized checkpoint from db")
 	}
+	if finalized == nil {
+		// This should never happen. At chain start, the finalized checkpoint
+		// would be the genesis state and block.
+		return errors.New("no finalized epoch in the database")
+	}
+	finalizedRoot := bytesutil.ToBytes32(finalized.Root)
+	var finalizedState *stateTrie.BeaconState
 
-	sort.Sort(sort.Reverse(sort.IntSlice(slots)))
-	blockRoots := make([]*pbrpc.BlockRoot, count)
-	for i := 0; i < int(count); i++ {
-		slot := uint64(slots[i])
-		blockRoots[i] = &pbrpc.BlockRoot{
-			Slot: slot,
-			Root: c.canonicalBlocks[slot],
+	finalizedState, err = s.stateGen.Resume(ctx)
+	if err != nil {
+		return errors.Wrap(err, "could not get finalized state from db")
+	}
+	if !featureconfig.Get().SkipRegenHistoricalStates {
+		// Since historical states were skipped, the node should start from last finalized check point.
+		finalizedRoot = s.beaconDB.LastArchivedIndexRoot(ctx)
+		if finalizedRoot == params.BeaconConfig().ZeroHash {
+			finalizedRoot = bytesutil.ToBytes32(finalized.Root)
 		}
 	}
-	return blockRoots
+
+	finalizedBlock, err := s.beaconDB.Block(ctx, finalizedRoot)
+	if err != nil {
+		return errors.Wrap(err, "could not get finalized block from db")
+	}
+
+	// To skip the regeneration of historical state, the node has to generate the parent of the last finalized state.
+	// We don't need to do this for genesis.
+	atGenesis := s.CurrentSlot() == 0
+	if featureconfig.Get().SkipRegenHistoricalStates && !atGenesis {
+		parentRoot := bytesutil.ToBytes32(finalizedBlock.Block.ParentRoot)
+		parentState, err := s.generateState(ctx, finalizedRoot, parentRoot)
+		if err != nil {
+			return err
+		}
+		if s.beaconDB.SaveState(ctx, parentState, parentRoot) != nil {
+			return err
+		}
+	}
+
+	if finalizedState == nil || finalizedBlock == nil {
+		return errors.New("finalized state and block can't be nil")
+	}
+	s.setHead(finalizedRoot, finalizedBlock, finalizedState)
+
+	return nil
 }
 
-// InsertsCanonical inserts a canonical block hash to its corresponding slot.
-// This is used for testing purpose.
-func (c *ChainService) InsertsCanonical(slot uint64, hash []byte) {
-	c.canonicalBlocksLock.Lock()
-	defer c.canonicalBlocksLock.Unlock()
-	c.canonicalBlocks[slot] = hash
+// This is called when a client starts from a non-genesis slot. It deletes the states in DB
+// from slot 1 (avoid genesis state) to `slot`.
+func (s *Service) pruneGarbageState(ctx context.Context, slot uint64) error {
+	if featureconfig.Get().DontPruneStateStartUp {
+		return nil
+	}
+
+	filter := filters.NewFilter().SetStartSlot(1).SetEndSlot(slot)
+	roots, err := s.beaconDB.BlockRoots(ctx, filter)
+	if err != nil {
+		return err
+	}
+	if err := s.beaconDB.DeleteStates(ctx, roots); err != nil {
+		return err
+	}
+
+	if err := s.beaconDB.SaveLastArchivedIndex(ctx, 0); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// This is called when a client starts from non-genesis slot. This passes last justified and finalized
+// information to fork choice service to initializes fork choice store.
+func (s *Service) resumeForkChoice(justifiedCheckpoint *ethpb.Checkpoint, finalizedCheckpoint *ethpb.Checkpoint) {
+	store := protoarray.New(justifiedCheckpoint.Epoch, finalizedCheckpoint.Epoch, bytesutil.ToBytes32(finalizedCheckpoint.Root))
+	s.forkChoiceStore = store
+}
+
+// This returns true if block has been processed before. Two ways to verify the block has been processed:
+// 1.) Check fork choice store.
+// 2.) Check DB.
+// Checking 1.) is ten times faster than checking 2.)
+func (s *Service) hasBlock(ctx context.Context, root [32]byte) bool {
+	if s.forkChoiceStore.HasNode(root) {
+		return true
+	}
+
+	return s.beaconDB.HasBlock(ctx, root)
 }

beacon-chain/blockchain/service_norace_test.go

@@ -0,0 +1,30 @@
+package blockchain
+
+import (
+	"context"
+	"io/ioutil"
+	"testing"
+
+	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
+	"github.com/sirupsen/logrus"
+)
+
+func init() {
+	logrus.SetLevel(logrus.DebugLevel)
+	logrus.SetOutput(ioutil.Discard)
+}
+
+func TestChainService_SaveHead_DataRace(t *testing.T) {
+	db, _ := testDB.SetupDB(t)
+	s := &Service{
+		beaconDB: db,
+	}
+	go func() {
+		if err := s.saveHead(context.Background(), [32]byte{}); err != nil {
+			t.Fatal(err)
+		}
+	}()
+	if err := s.saveHead(context.Background(), [32]byte{}); err != nil {
+		t.Fatal(err)
+	}
+}

beacon-chain/blockchain/service_test.go

@@ -1,297 +1,177 @@
 package blockchain
 
 import (
+	"bytes"
 	"context"
-	"crypto/rand"
-	"encoding/binary"
-	"errors"
 	"io/ioutil"
-	"math/big"
 	"reflect"
 	"testing"
 	"time"
 
-	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
-	gethTypes "github.com/ethereum/go-ethereum/core/types"
 	"github.com/gogo/protobuf/proto"
-	"github.com/prysmaticlabs/prysm/beacon-chain/attestation"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/go-ssz"
+	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
+	"github.com/prysmaticlabs/prysm/beacon-chain/cache/depositcache"
 	b "github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
+	statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
 	"github.com/prysmaticlabs/prysm/beacon-chain/db"
-	"github.com/prysmaticlabs/prysm/beacon-chain/internal"
+	"github.com/prysmaticlabs/prysm/beacon-chain/db/filters"
+	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
+	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
+	"github.com/prysmaticlabs/prysm/beacon-chain/operations/attestations"
+	"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
 	"github.com/prysmaticlabs/prysm/beacon-chain/powchain"
+	beaconstate "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stateutil"
+	protodb "github.com/prysmaticlabs/prysm/proto/beacon/db"
 	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	pbrpc "github.com/prysmaticlabs/prysm/proto/beacon/rpc/v1"
-	"github.com/prysmaticlabs/prysm/shared/bls"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
 	"github.com/prysmaticlabs/prysm/shared/event"
-	"github.com/prysmaticlabs/prysm/shared/featureconfig"
-	"github.com/prysmaticlabs/prysm/shared/forkutil"
-	"github.com/prysmaticlabs/prysm/shared/hashutil"
-	"github.com/prysmaticlabs/prysm/shared/p2p"
 	"github.com/prysmaticlabs/prysm/shared/params"
 	"github.com/prysmaticlabs/prysm/shared/testutil"
 	"github.com/sirupsen/logrus"
 	logTest "github.com/sirupsen/logrus/hooks/test"
 )
 
-// Ensure ChainService implements interfaces.
-var _ = ChainFeeds(&ChainService{})
-
 func init() {
 	logrus.SetLevel(logrus.DebugLevel)
 	logrus.SetOutput(ioutil.Discard)
-	featureconfig.InitFeatureConfig(&featureconfig.FeatureFlagConfig{
-		EnableCrosslinks:          true,
-		EnableCheckBlockStateRoot: true,
-	})
 }
 
-type mockOperationService struct{}
-
-func (ms *mockOperationService) IncomingProcessedBlockFeed() *event.Feed {
-	return new(event.Feed)
+type mockBeaconNode struct {
+	stateFeed *event.Feed
 }
 
-func (ms *mockOperationService) IncomingAttFeed() *event.Feed {
-	return nil
-}
-
-func (ms *mockOperationService) IncomingExitFeed() *event.Feed {
-	return nil
-}
-
-type mockClient struct{}
-
-func (m *mockClient) SubscribeNewHead(ctx context.Context, ch chan<- *gethTypes.Header) (ethereum.Subscription, error) {
-	return new(event.Feed).Subscribe(ch), nil
-}
-
-func (m *mockClient) BlockByHash(ctx context.Context, hash common.Hash) (*gethTypes.Block, error) {
-	head := &gethTypes.Header{Number: big.NewInt(0), Difficulty: big.NewInt(100)}
-	return gethTypes.NewBlockWithHeader(head), nil
-}
-
-func (m *mockClient) BlockByNumber(ctx context.Context, number *big.Int) (*gethTypes.Block, error) {
-	head := &gethTypes.Header{Number: big.NewInt(0), Difficulty: big.NewInt(100)}
-	return gethTypes.NewBlockWithHeader(head), nil
-}
-
-func (m *mockClient) HeaderByNumber(ctx context.Context, number *big.Int) (*gethTypes.Header, error) {
-	return &gethTypes.Header{Number: big.NewInt(0), Difficulty: big.NewInt(100)}, nil
-}
-
-func (m *mockClient) SubscribeFilterLogs(ctx context.Context, q ethereum.FilterQuery, ch chan<- gethTypes.Log) (ethereum.Subscription, error) {
-	return new(event.Feed).Subscribe(ch), nil
-}
-
-func (m *mockClient) CallContract(ctx context.Context, call ethereum.CallMsg, blockNumber *big.Int) ([]byte, error) {
-	return []byte{'t', 'e', 's', 't'}, nil
-}
-
-func (m *mockClient) CodeAt(ctx context.Context, account common.Address, blockNumber *big.Int) ([]byte, error) {
-	return []byte{'t', 'e', 's', 't'}, nil
-}
-
-func (m *mockClient) FilterLogs(ctx context.Context, q ethereum.FilterQuery) ([]gethTypes.Log, error) {
-	logs := make([]gethTypes.Log, 3)
-	for i := 0; i < len(logs); i++ {
-		logs[i].Address = common.Address{}
-		logs[i].Topics = make([]common.Hash, 5)
-		logs[i].Topics[0] = common.Hash{'a'}
-		logs[i].Topics[1] = common.Hash{'b'}
-		logs[i].Topics[2] = common.Hash{'c'}
-
+// StateFeed mocks the same method in the beacon node.
+func (mbn *mockBeaconNode) StateFeed() *event.Feed {
+	if mbn.stateFeed == nil {
+		mbn.stateFeed = new(event.Feed)
 	}
-	return logs, nil
-}
-
-func (m *mockClient) LatestBlockHash() common.Hash {
-	return common.BytesToHash([]byte{'A'})
-}
-
-type faultyClient struct{}
-
-func (f *faultyClient) SubscribeNewHead(ctx context.Context, ch chan<- *gethTypes.Header) (ethereum.Subscription, error) {
-	return new(event.Feed).Subscribe(ch), nil
-}
-
-func (f *faultyClient) BlockByHash(ctx context.Context, hash common.Hash) (*gethTypes.Block, error) {
-	return nil, errors.New("failed")
-}
-
-func (f *faultyClient) BlockByNumber(ctx context.Context, number *big.Int) (*gethTypes.Block, error) {
-	return nil, errors.New("failed")
-}
-
-func (f *faultyClient) HeaderByNumber(ctx context.Context, number *big.Int) (*gethTypes.Header, error) {
-	return nil, errors.New("failed")
-}
-
-func (f *faultyClient) SubscribeFilterLogs(ctx context.Context, q ethereum.FilterQuery, ch chan<- gethTypes.Log) (ethereum.Subscription, error) {
-	return new(event.Feed).Subscribe(ch), nil
-}
-
-func (f *faultyClient) FilterLogs(ctx context.Context, q ethereum.FilterQuery) ([]gethTypes.Log, error) {
-	return nil, errors.New("unable to retrieve logs")
-}
-
-func (f *faultyClient) CallContract(ctx context.Context, call ethereum.CallMsg, blockNumber *big.Int) ([]byte, error) {
-	return []byte{}, errors.New("unable to retrieve contract code")
-}
-
-func (f *faultyClient) CodeAt(ctx context.Context, account common.Address, blockNumber *big.Int) ([]byte, error) {
-	return []byte{}, errors.New("unable to retrieve contract code")
-}
-
-func (f *faultyClient) LatestBlockHash() common.Hash {
-	return common.BytesToHash([]byte{'A'})
+	return mbn.stateFeed
 }
 
 type mockBroadcaster struct {
 	broadcastCalled bool
 }
 
-func (mb *mockBroadcaster) Broadcast(_ context.Context, _ proto.Message) {
+func (mb *mockBroadcaster) Broadcast(_ context.Context, _ proto.Message) error {
 	mb.broadcastCalled = true
+	return nil
+}
+
+func (mb *mockBroadcaster) BroadcastAttestation(_ context.Context, _ uint64, _ *ethpb.Attestation) error {
+	mb.broadcastCalled = true
+	return nil
 }
 
 var _ = p2p.Broadcaster(&mockBroadcaster{})
 
-func setupInitialDeposits(t *testing.T, numDeposits int) ([]*pb.Deposit, []*bls.SecretKey) {
-	privKeys := make([]*bls.SecretKey, numDeposits)
-	deposits := make([]*pb.Deposit, numDeposits)
-	for i := 0; i < len(deposits); i++ {
-		priv, err := bls.RandKey(rand.Reader)
-		if err != nil {
-			t.Fatal(err)
-		}
-		depositInput := &pb.DepositInput{
-			Pubkey: priv.PublicKey().Marshal(),
-		}
-		balance := params.BeaconConfig().MaxDepositAmount
-		depositData, err := helpers.EncodeDepositData(depositInput, balance, time.Now().Unix())
-		if err != nil {
-			t.Fatalf("Cannot encode data: %v", err)
-		}
-		deposits[i] = &pb.Deposit{
-			DepositData:     depositData,
-			MerkleTreeIndex: uint64(i),
-		}
-		privKeys[i] = priv
-	}
-	return deposits, privKeys
-}
-
-func createPreChainStartDeposit(t *testing.T, pk []byte, index uint64) *pb.Deposit {
-	depositInput := &pb.DepositInput{Pubkey: pk}
-	balance := params.BeaconConfig().MaxDepositAmount
-	depositData, err := helpers.EncodeDepositData(depositInput, balance, time.Now().Unix())
-	if err != nil {
-		t.Fatalf("Cannot encode data: %v", err)
-	}
-	return &pb.Deposit{DepositData: depositData, MerkleTreeIndex: index}
-}
-
-func createRandaoReveal(t *testing.T, beaconState *pb.BeaconState, privKeys []*bls.SecretKey) []byte {
-	// We fetch the proposer's index as that is whom the RANDAO will be verified against.
-	proposerIdx, err := helpers.BeaconProposerIndex(beaconState, beaconState.Slot)
+func setupBeaconChain(t *testing.T, beaconDB db.Database, sc *cache.StateSummaryCache) *Service {
+	endpoint := "http://127.0.0.1"
+	ctx := context.Background()
+	var web3Service *powchain.Service
+	var err error
+	bState, _ := testutil.DeterministicGenesisState(t, 10)
+	err = beaconDB.SavePowchainData(ctx, &protodb.ETH1ChainData{
+		BeaconState: bState.InnerStateUnsafe(),
+		Trie:        &protodb.SparseMerkleTrie{},
+		CurrentEth1Data: &protodb.LatestETH1Data{
+			BlockHash: make([]byte, 32),
+		},
+		ChainstartData: &protodb.ChainStartData{
+			Eth1Data: &ethpb.Eth1Data{
+				DepositRoot:  make([]byte, 32),
+				DepositCount: 0,
+				BlockHash:    make([]byte, 32),
+			},
+		},
+		DepositContainers: []*protodb.DepositContainer{},
+	})
 	if err != nil {
 		t.Fatal(err)
 	}
-	epoch := helpers.SlotToEpoch(beaconState.Slot)
-	buf := make([]byte, 32)
-	binary.LittleEndian.PutUint64(buf, epoch)
-	domain := forkutil.DomainVersion(beaconState.Fork, epoch, params.BeaconConfig().DomainRandao)
-	// We make the previous validator's index sign the message instead of the proposer.
-	epochSignature := privKeys[proposerIdx].Sign(buf, domain)
-	return epochSignature.Marshal()
-}
-
-func setupGenesisBlock(t *testing.T, cs *ChainService) ([32]byte, *pb.BeaconBlock) {
-	genesis := b.NewGenesisBlock([]byte{})
-	if err := cs.beaconDB.SaveBlock(genesis); err != nil {
-		t.Fatalf("could not save block to db: %v", err)
-	}
-	parentHash, err := hashutil.HashBeaconBlock(genesis)
-	if err != nil {
-		t.Fatalf("unable to get tree hash root of canonical head: %v", err)
-	}
-	return parentHash, genesis
-}
-
-func setupBeaconChain(t *testing.T, beaconDB *db.BeaconDB, attsService *attestation.Service) *ChainService {
-	endpoint := "ws://127.0.0.1"
-	ctx := context.Background()
-	var web3Service *powchain.Web3Service
-	var err error
-	client := &mockClient{}
-	web3Service, err = powchain.NewWeb3Service(ctx, &powchain.Web3ServiceConfig{
-		Endpoint:        endpoint,
+	web3Service, err = powchain.NewService(ctx, &powchain.Web3ServiceConfig{
+		BeaconDB:        beaconDB,
+		HTTPEndPoint:    endpoint,
 		DepositContract: common.Address{},
-		Reader:          client,
-		Client:          client,
-		Logger:          client,
 	})
 	if err != nil {
 		t.Fatalf("unable to set up web3 service: %v", err)
 	}
 
-	cfg := &Config{
-		BeaconBlockBuf: 0,
-		BeaconDB:       beaconDB,
-		Web3Service:    web3Service,
-		OpsPoolService: &mockOperationService{},
-		AttsService:    attsService,
-		P2p:            &mockBroadcaster{},
-	}
+	opsService, err := attestations.NewService(ctx, &attestations.Config{Pool: attestations.NewPool()})
 	if err != nil {
-		t.Fatalf("could not register blockchain service: %v", err)
+		t.Fatal(err)
 	}
-	chainService, err := NewChainService(ctx, cfg)
+	cfg := &Config{
+		BeaconBlockBuf:    0,
+		BeaconDB:          beaconDB,
+		DepositCache:      depositcache.NewDepositCache(),
+		ChainStartFetcher: web3Service,
+		P2p:               &mockBroadcaster{},
+		StateNotifier:     &mockBeaconNode{},
+		AttPool:           attestations.NewPool(),
+		StateGen:          stategen.New(beaconDB, sc),
+		ForkChoiceStore:   protoarray.New(0, 0, params.BeaconConfig().ZeroHash),
+		OpsService:        opsService,
+	}
+
+	chainService, err := NewService(ctx, cfg)
 	if err != nil {
 		t.Fatalf("unable to setup chain service: %v", err)
 	}
+	chainService.genesisTime = time.Unix(1, 0) // non-zero time
 
 	return chainService
 }
 
-func SetSlotInState(service *ChainService, slot uint64) error {
-	bState, err := service.beaconDB.HeadState(context.Background())
-	if err != nil {
-		return err
-	}
-
-	bState.Slot = slot
-	return service.beaconDB.SaveState(context.Background(), bState)
-}
-
 func TestChainStartStop_Uninitialized(t *testing.T) {
 	hook := logTest.NewGlobal()
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
-	chainService := setupBeaconChain(t, db, nil)
+	db, sc := testDB.SetupDB(t)
+	chainService := setupBeaconChain(t, db, sc)
 
-	// Test the start function.
-	genesisChan := make(chan time.Time, 0)
-	sub := chainService.stateInitializedFeed.Subscribe(genesisChan)
-	defer sub.Unsubscribe()
+	// Listen for state events.
+	stateSubChannel := make(chan *feed.Event, 1)
+	stateSub := chainService.stateNotifier.StateFeed().Subscribe(stateSubChannel)
+
+	// Test the chain start state notifier.
+	genesisTime := time.Unix(1, 0)
 	chainService.Start()
-	chainService.chainStartChan <- time.Unix(0, 0)
-	genesisTime := <-genesisChan
-	if genesisTime != time.Unix(0, 0) {
-		t.Errorf(
-			"Expected genesis time to equal chainstart time (%v), received %v",
-			time.Unix(0, 0),
-			genesisTime,
-		)
+	event := &feed.Event{
+		Type: statefeed.ChainStarted,
+		Data: &statefeed.ChainStartedData{
+			StartTime: genesisTime,
+		},
 	}
+	// Send in a loop to ensure it is delivered (busy wait for the service to subscribe to the state feed).
+	for sent := 1; sent == 1; {
+		sent = chainService.stateNotifier.StateFeed().Send(event)
+		if sent == 1 {
+			// Flush our local subscriber.
+			<-stateSubChannel
+		}
+	}
+
+	// Now wait for notification the state is ready.
+	for stateInitialized := false; stateInitialized == false; {
+		recv := <-stateSubChannel
+		if recv.Type == statefeed.Initialized {
+			stateInitialized = true
+		}
+	}
+	stateSub.Unsubscribe()
 
 	beaconState, err := db.HeadState(context.Background())
 	if err != nil {
 		t.Fatal(err)
 	}
-	if beaconState == nil || beaconState.Slot != params.BeaconConfig().GenesisSlot {
+	if beaconState == nil || beaconState.Slot() != 0 {
 		t.Error("Expected canonical state feed to send a state with genesis block")
 	}
 	if err := chainService.Stop(); err != nil {
@@ -301,23 +181,42 @@ func TestChainStartStop_Uninitialized(t *testing.T) {
 	if chainService.ctx.Err() != context.Canceled {
 		t.Error("Context was not canceled")
 	}
-	testutil.AssertLogsContain(t, hook, "Waiting for ChainStart log from the Validator Deposit Contract to start the beacon chain...")
-	testutil.AssertLogsContain(t, hook, "ChainStart time reached, starting the beacon chain!")
+	testutil.AssertLogsContain(t, hook, "Waiting")
+	testutil.AssertLogsContain(t, hook, "Initialized beacon chain genesis state")
 }
 
 func TestChainStartStop_Initialized(t *testing.T) {
 	hook := logTest.NewGlobal()
-	db := internal.SetupDB(t)
-	defer internal.TeardownDB(t, db)
+	ctx := context.Background()
+	db, sc := testDB.SetupDB(t)
 
-	chainService := setupBeaconChain(t, db, nil)
+	chainService := setupBeaconChain(t, db, sc)
 
-	unixTime := uint64(time.Now().Unix())
-	deposits, _ := setupInitialDeposits(t, 100)
-	if err := db.InitializeState(context.Background(), unixTime, deposits, &pb.Eth1Data{}); err != nil {
-		t.Fatalf("Could not initialize beacon state to disk: %v", err)
+	genesisBlk := testutil.NewBeaconBlock()
+	blkRoot, err := stateutil.BlockRoot(genesisBlk.Block)
+	if err != nil {
+		t.Fatal(err)
 	}
-	setupGenesisBlock(t, chainService)
+	if err := db.SaveBlock(ctx, genesisBlk); err != nil {
+		t.Fatal(err)
+	}
+	s := testutil.NewBeaconState()
+	if err := s.SetSlot(1); err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SaveState(ctx, s, blkRoot); err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SaveHeadBlockRoot(ctx, blkRoot); err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SaveGenesisBlockRoot(ctx, blkRoot); err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SaveJustifiedCheckpoint(ctx, &ethpb.Checkpoint{Root: blkRoot[:]}); err != nil {
+		t.Fatal(err)
+	}
+
 	// Test the start function.
 	chainService.Start()
 
@@ -329,48 +228,300 @@ func TestChainStartStop_Initialized(t *testing.T) {
 	if chainService.ctx.Err() != context.Canceled {
 		t.Error("context was not canceled")
 	}
-	testutil.AssertLogsContain(t, hook, "Beacon chain data already exists, starting service")
+	testutil.AssertLogsContain(t, hook, "data already exists")
 }
 
-func TestRecentCanonicalRoots_CanFilter(t *testing.T) {
-	service := setupBeaconChain(t, nil, nil)
-	blks := map[uint64][]byte{
-		1:  {'A'},
-		50: {'E'},
-		2:  {'B'},
-		99: {'F'},
-		30: {'D'},
-		3:  {'C'},
-	}
-	service.canonicalBlocks = blks
+func TestChainService_InitializeBeaconChain(t *testing.T) {
+	helpers.ClearCache()
+	db, sc := testDB.SetupDB(t)
+	ctx := context.Background()
 
-	want := []*pbrpc.BlockRoot{{Slot: 99, Root: []byte{'F'}}}
-	roots := service.RecentCanonicalRoots(1)
-	if !reflect.DeepEqual(want, roots) {
-		t.Log("Incorrect block roots received")
+	bc := setupBeaconChain(t, db, sc)
+	var err error
+
+	// Set up 10 deposits pre chain start for validators to register
+	count := uint64(10)
+	deposits, _, err := testutil.DeterministicDepositsAndKeys(count)
+	if err != nil {
+		t.Fatal(err)
+	}
+	trie, _, err := testutil.DepositTrieFromDeposits(deposits)
+	if err != nil {
+		t.Fatal(err)
+	}
+	hashTreeRoot := trie.HashTreeRoot()
+	genState, err := state.EmptyGenesisState()
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = genState.SetEth1Data(&ethpb.Eth1Data{
+		DepositRoot:  hashTreeRoot[:],
+		DepositCount: uint64(len(deposits)),
+	})
+	for _, deposit := range deposits {
+		genState, err = b.ProcessPreGenesisDeposit(ctx, genState, deposit)
+		if err != nil {
+			t.Fatal(err)
+		}
 	}
 
-	want = []*pbrpc.BlockRoot{
-		{Slot: 99, Root: []byte{'F'}},
-		{Slot: 50, Root: []byte{'E'}},
-		{Slot: 30, Root: []byte{'D'}},
-	}
-	roots = service.RecentCanonicalRoots(3)
-	if !reflect.DeepEqual(want, roots) {
-		t.Log("Incorrect block roots received")
+	if _, err := bc.initializeBeaconChain(ctx, time.Unix(0, 0), genState, &ethpb.Eth1Data{
+		DepositRoot: hashTreeRoot[:],
+	}); err != nil {
+		t.Fatal(err)
 	}
 
-	want = []*pbrpc.BlockRoot{
-		{Slot: 99, Root: []byte{'F'}},
-		{Slot: 50, Root: []byte{'E'}},
-		{Slot: 30, Root: []byte{'D'}},
-		{Slot: 3, Root: []byte{'C'}},
-		{Slot: 2, Root: []byte{'B'}},
-		{Slot: 1, Root: []byte{'A'}},
+	if _, err := bc.HeadState(ctx); err != nil {
+		t.Error(err)
 	}
-	roots = service.RecentCanonicalRoots(100)
-	if !reflect.DeepEqual(want, roots) {
-		t.Log("Incorrect block roots received")
+	headBlk, err := bc.HeadBlock(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if headBlk == nil {
+		t.Error("Head state can't be nil after initialize beacon chain")
+	}
+	if bc.headRoot() == params.BeaconConfig().ZeroHash {
+		t.Error("Canonical root for slot 0 can't be zeros after initialize beacon chain")
+	}
+}
+
+func TestChainService_InitializeChainInfo(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	ctx := context.Background()
+
+	genesis := testutil.NewBeaconBlock()
+	genesisRoot, err := stateutil.BlockRoot(genesis.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SaveGenesisBlockRoot(ctx, genesisRoot); err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SaveBlock(ctx, genesis); err != nil {
+		t.Fatal(err)
+	}
+
+	finalizedSlot := params.BeaconConfig().SlotsPerEpoch*2 + 1
+	headBlock := testutil.NewBeaconBlock()
+	headBlock.Block.Slot = finalizedSlot
+	headBlock.Block.ParentRoot = bytesutil.PadTo(genesisRoot[:], 32)
+	headState := testutil.NewBeaconState()
+	if err := headState.SetSlot(finalizedSlot); err != nil {
+		t.Fatal(err)
+	}
+	if err := headState.SetGenesisValidatorRoot(params.BeaconConfig().ZeroHash[:]); err != nil {
+		t.Fatal(err)
+	}
+	headRoot, err := stateutil.BlockRoot(headBlock.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SaveState(ctx, headState, headRoot); err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SaveState(ctx, headState, genesisRoot); err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SaveBlock(ctx, headBlock); err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SaveFinalizedCheckpoint(ctx, &ethpb.Checkpoint{
+		Epoch: helpers.SlotToEpoch(finalizedSlot),
+		Root:  headRoot[:],
+	}); err != nil {
+		t.Fatal(err)
+	}
+	c := &Service{beaconDB: db, stateGen: stategen.New(db, sc)}
+	if err := c.initializeChainInfo(ctx); err != nil {
+		t.Fatal(err)
+	}
+	headBlk, err := c.HeadBlock(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(headBlk, headBlock) {
+		t.Error("head block incorrect")
+	}
+	s, err := c.HeadState(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(s.InnerStateUnsafe(), headState.InnerStateUnsafe()) {
+		t.Error("head state incorrect")
+	}
+	if headBlock.Block.Slot != c.HeadSlot() {
+		t.Error("head slot incorrect")
+	}
+	r, err := c.HeadRoot(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(headRoot[:], r) {
+		t.Error("head slot incorrect")
+	}
+	if c.genesisRoot != genesisRoot {
+		t.Error("genesis block root incorrect")
+	}
+}
+
+func TestChainService_SaveHeadNoDB(t *testing.T) {
+	db, sc := testDB.SetupDB(t)
+	ctx := context.Background()
+	s := &Service{
+		beaconDB: db,
+		stateGen: stategen.New(db, sc),
+	}
+	b := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Slot: 1}}
+	r, err := ssz.HashTreeRoot(b)
+	if err != nil {
+		t.Fatal(err)
+	}
+	newState := testutil.NewBeaconState()
+	if err := s.stateGen.SaveState(ctx, r, newState); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := s.saveHeadNoDB(ctx, b, r); err != nil {
+		t.Fatal(err)
+	}
+
+	newB, err := s.beaconDB.HeadBlock(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if reflect.DeepEqual(newB, b) {
+		t.Error("head block should not be equal")
+	}
+}
+
+func TestChainService_PruneOldStates(t *testing.T) {
+	db, _ := testDB.SetupDB(t)
+	ctx := context.Background()
+	s := &Service{
+		beaconDB: db,
+	}
+
+	for i := 0; i < 100; i++ {
+		block := &ethpb.BeaconBlock{Slot: uint64(i)}
+		if err := s.beaconDB.SaveBlock(ctx, &ethpb.SignedBeaconBlock{Block: block}); err != nil {
+			t.Fatal(err)
+		}
+		r, err := stateutil.BlockRoot(block)
+		if err != nil {
+			t.Fatal(err)
+		}
+		newState := testutil.NewBeaconState()
+		if err := newState.SetSlot(uint64(i)); err != nil {
+			t.Fatal(err)
+		}
+		if err := s.beaconDB.SaveState(ctx, newState, r); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	// Delete half of the states.
+	if err := s.pruneGarbageState(ctx, 50); err != nil {
+		t.Fatal(err)
+	}
+
+	filter := filters.NewFilter().SetStartSlot(1).SetEndSlot(100)
+	roots, err := s.beaconDB.BlockRoots(ctx, filter)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for i := 1; i < 50; i++ {
+		s, err := s.beaconDB.State(ctx, roots[i])
+		if err != nil {
+			t.Fatal(err)
+		}
+		if s != nil {
+			t.Errorf("wanted nil for slot %d", i)
+		}
+	}
+}
+
+func TestHasBlock_ForkChoiceAndDB(t *testing.T) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(t)
+	s := &Service{
+		forkChoiceStore:  protoarray.New(0, 0, [32]byte{}),
+		finalizedCheckpt: &ethpb.Checkpoint{},
+		beaconDB:         db,
+	}
+	block := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{}}}
+	r, err := stateutil.BlockRoot(block.Block)
+	if err != nil {
+		t.Fatal(err)
+	}
+	bs := &pb.BeaconState{FinalizedCheckpoint: &ethpb.Checkpoint{}, CurrentJustifiedCheckpoint: &ethpb.Checkpoint{}}
+	state, err := beaconstate.InitializeFromProto(bs)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := s.insertBlockToForkChoiceStore(ctx, block.Block, r, state); err != nil {
+		t.Fatal(err)
+	}
+
+	if s.hasBlock(ctx, [32]byte{}) {
+		t.Error("Should not have block")
+	}
+
+	if !s.hasBlock(ctx, r) {
+		t.Error("Should have block")
+	}
+}
+
+func BenchmarkHasBlockDB(b *testing.B) {
+	db, _ := testDB.SetupDB(b)
+	ctx := context.Background()
+	s := &Service{
+		beaconDB: db,
+	}
+	block := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{}}
+	if err := s.beaconDB.SaveBlock(ctx, block); err != nil {
+		b.Fatal(err)
+	}
+	r, err := stateutil.BlockRoot(block.Block)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		if !s.beaconDB.HasBlock(ctx, r) {
+			b.Fatal("Block is not in DB")
+		}
+	}
+}
+
+func BenchmarkHasBlockForkChoiceStore(b *testing.B) {
+	ctx := context.Background()
+	db, _ := testDB.SetupDB(b)
+	s := &Service{
+		forkChoiceStore:  protoarray.New(0, 0, [32]byte{}),
+		finalizedCheckpt: &ethpb.Checkpoint{},
+		beaconDB:         db,
+	}
+	block := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{}}}
+	r, err := stateutil.BlockRoot(block.Block)
+	if err != nil {
+		b.Fatal(err)
+	}
+	bs := &pb.BeaconState{FinalizedCheckpoint: &ethpb.Checkpoint{}, CurrentJustifiedCheckpoint: &ethpb.Checkpoint{}}
+	state, err := beaconstate.InitializeFromProto(bs)
+	if err != nil {
+		b.Fatal(err)
+	}
+	if err := s.insertBlockToForkChoiceStore(ctx, block.Block, r, state); err != nil {
+		b.Fatal(err)
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		if !s.forkChoiceStore.HasNode(r) {
+			b.Fatal("Block is not in fork choice store")
+		}
 	}
-
 }

beacon-chain/blockchain/stategenerator/BUILD.bazel

@@ -1,32 +0,0 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
-
-go_library(
-    name = "go_default_library",
-    srcs = ["state_generator.go"],
-    importpath = "github.com/prysmaticlabs/prysm/beacon-chain/blockchain/stategenerator",
-    visibility = ["//beacon-chain:__subpackages__"],
-    deps = [
-        "//beacon-chain/core/state:go_default_library",
-        "//beacon-chain/db:go_default_library",
-        "//proto/beacon/p2p/v1:go_default_library",
-        "//shared/bytesutil:go_default_library",
-        "//shared/hashutil:go_default_library",
-        "//shared/params:go_default_library",
-        "@com_github_sirupsen_logrus//:go_default_library",
-        "@io_opencensus_go//trace:go_default_library",
-    ],
-)
-
-go_test(
-    name = "go_default_test",
-    srcs = ["state_generator_test.go"],
-    embed = [":go_default_library"],
-    deps = [
-        "//beacon-chain/chaintest/backend:go_default_library",
-        "//beacon-chain/db:go_default_library",
-        "//proto/beacon/p2p/v1:go_default_library",
-        "//shared/featureconfig:go_default_library",
-        "//shared/params:go_default_library",
-        "@com_github_gogo_protobuf//proto:go_default_library",
-    ],
-)

beacon-chain/blockchain/stategenerator/state_generator.go

@@ -1,177 +0,0 @@
-package stategenerator
-
-import (
-	"context"
-	"fmt"
-
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
-	"github.com/prysmaticlabs/prysm/beacon-chain/db"
-	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	"github.com/prysmaticlabs/prysm/shared/bytesutil"
-	"github.com/prysmaticlabs/prysm/shared/hashutil"
-	"github.com/prysmaticlabs/prysm/shared/params"
-	"github.com/sirupsen/logrus"
-	"go.opencensus.io/trace"
-)
-
-var log = logrus.WithField("prefix", "stategenerator")
-
-// GenerateStateFromBlock generates state from the last finalized state to the input slot.
-// Ex:
-// 	1A - 2B(finalized) - 3C - 4 - 5D - 6 - 7F  (letters mean there's a block).
-//  Input: slot 6.
-//	Output: resulting state of state transition function after applying block C and D.
-//  	along with skipped slot 4 and 6.
-func GenerateStateFromBlock(ctx context.Context, db *db.BeaconDB, slot uint64) (*pb.BeaconState, error) {
-	ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.stategenerator.GenerateStateFromBlock")
-	defer span.End()
-	fState, err := db.HistoricalStateFromSlot(ctx, slot)
-	if err != nil {
-		return nil, err
-	}
-
-	// return finalized state if it's the same as input slot.
-	if fState.Slot == slot {
-		return fState, nil
-	}
-
-	// input slot can't be smaller than last finalized state's slot.
-	if fState.Slot > slot {
-		return nil, fmt.Errorf(
-			"requested slot %d < current slot %d in the finalized beacon state",
-			slot-params.BeaconConfig().GenesisSlot,
-			fState.Slot-params.BeaconConfig().GenesisSlot,
-		)
-	}
-
-	if fState.LatestBlock == nil {
-		return nil, fmt.Errorf("latest head in state is nil %v", err)
-	}
-
-	fRoot, err := hashutil.HashBeaconBlock(fState.LatestBlock)
-	if err != nil {
-		return nil, fmt.Errorf("unable to get block root %v", err)
-	}
-
-	// from input slot, retrieve its corresponding block and call that the most recent block.
-	mostRecentBlock, err := db.BlockBySlot(ctx, slot)
-	if err != nil {
-		return nil, err
-	}
-
-	// if the most recent block is a skip block, we get its parent block.
-	// ex:
-	// 	1A - 2B - 3C - 4 - 5 (letters mean there's a block).
-	//  input slot is 5, but slots 4 and 5 are skipped, we get block C from slot 3.
-	lastSlot := slot
-	for mostRecentBlock == nil {
-		lastSlot--
-		mostRecentBlock, err = db.BlockBySlot(ctx, lastSlot)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	// retrieve the block list to recompute state of the input slot.
-	blocks, err := blocksSinceFinalized(ctx, db, mostRecentBlock, fRoot)
-	if err != nil {
-		return nil, fmt.Errorf("unable to look up block ancestors %v", err)
-	}
-
-	log.Infof("Recompute state starting last finalized slot %d and ending slot %d",
-		fState.Slot-params.BeaconConfig().GenesisSlot, slot-params.BeaconConfig().GenesisSlot)
-	postState := fState
-	root := fRoot
-	// this recomputes state up to the last available block.
-	//	ex: 1A - 2B (finalized) - 3C - 4 - 5 - 6C - 7 - 8 (C is the last block).
-	// 	input slot 8, this recomputes state to slot 6.
-	for i := len(blocks); i > 0; i-- {
-		block := blocks[i-1]
-		if block.Slot <= postState.Slot {
-			continue
-		}
-		// running state transitions for skipped slots.
-		for block.Slot != fState.Slot+1 {
-			postState, err = state.ExecuteStateTransition(
-				ctx,
-				postState,
-				nil,
-				root,
-				&state.TransitionConfig{
-					VerifySignatures: false,
-					Logging:          false,
-				},
-			)
-			if err != nil {
-				return nil, fmt.Errorf("could not execute state transition %v", err)
-			}
-		}
-		postState, err = state.ExecuteStateTransition(
-			ctx,
-			postState,
-			block,
-			root,
-			&state.TransitionConfig{
-				VerifySignatures: false,
-				Logging:          false,
-			},
-		)
-		if err != nil {
-			return nil, fmt.Errorf("could not execute state transition %v", err)
-		}
-
-		root, err = hashutil.HashBeaconBlock(block)
-		if err != nil {
-			return nil, fmt.Errorf("unable to get block root %v", err)
-		}
-	}
-
-	// this recomputes state from last block to last slot if there's skipp slots after.
-	//	ex: 1A - 2B (finalized) - 3C - 4 - 5 - 6C - 7 - 8 (7 and 8 are skipped slots).
-	// 	input slot 8, this recomputes state from 6C to 8.
-	for i := postState.Slot; i < slot; i++ {
-		postState, err = state.ExecuteStateTransition(
-			ctx,
-			postState,
-			nil,
-			root,
-			&state.TransitionConfig{
-				VerifySignatures: false,
-				Logging:          false,
-			},
-		)
-		if err != nil {
-			return nil, fmt.Errorf("could not execute state transition %v", err)
-		}
-	}
-
-	log.Infof("Finished recompute state with slot %d and finalized epoch %d",
-		postState.Slot-params.BeaconConfig().GenesisSlot, postState.FinalizedEpoch-params.BeaconConfig().GenesisEpoch)
-
-	return postState, nil
-}
-
-// blocksSinceFinalized will return a list of linked blocks that's
-// between the input block and the last finalized block in the db.
-// The input block is also returned in the list.
-// Ex:
-// 	A -> B(finalized) -> C -> D -> E -> D.
-// 	Input: E, output: [E, D, C, B].
-func blocksSinceFinalized(ctx context.Context, db *db.BeaconDB, block *pb.BeaconBlock,
-	finalizedBlockRoot [32]byte) ([]*pb.BeaconBlock, error) {
-	ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.stategenerator.blocksSinceFinalized")
-	defer span.End()
-	blockAncestors := make([]*pb.BeaconBlock, 0)
-	blockAncestors = append(blockAncestors, block)
-	parentRoot := bytesutil.ToBytes32(block.ParentRootHash32)
-	// looking up ancestors, until the finalized block.
-	for parentRoot != finalizedBlockRoot {
-		retblock, err := db.Block(parentRoot)
-		if err != nil {
-			return nil, err
-		}
-		blockAncestors = append(blockAncestors, retblock)
-		parentRoot = bytesutil.ToBytes32(retblock.ParentRootHash32)
-	}
-	return blockAncestors, nil
-}

beacon-chain/blockchain/stategenerator/state_generator_test.go

@@ -1,189 +0,0 @@
-package stategenerator_test
-
-import (
-	"context"
-	"strings"
-	"testing"
-
-	"github.com/gogo/protobuf/proto"
-	"github.com/prysmaticlabs/prysm/beacon-chain/blockchain/stategenerator"
-	"github.com/prysmaticlabs/prysm/beacon-chain/chaintest/backend"
-	"github.com/prysmaticlabs/prysm/beacon-chain/db"
-	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	"github.com/prysmaticlabs/prysm/shared/featureconfig"
-	"github.com/prysmaticlabs/prysm/shared/params"
-)
-
-func init() {
-	featureconfig.InitFeatureConfig(&featureconfig.FeatureFlagConfig{
-		CacheTreeHash: false,
-	})
-}
-func TestGenerateState_OK(t *testing.T) {
-	b, err := backend.NewSimulatedBackend()
-	if err != nil {
-		t.Fatalf("Could not create a new simulated backend %v", err)
-	}
-	privKeys, err := b.SetupBackend(100)
-	if err != nil {
-		t.Fatalf("Could not set up backend %v", err)
-	}
-	beaconDb := b.DB()
-	defer b.Shutdown()
-	defer db.TeardownDB(beaconDb)
-	ctx := context.Background()
-
-	slotLimit := uint64(30)
-
-	// Run the simulated chain for 30 slots, to get a state that we can save as finalized.
-	for i := uint64(0); i < slotLimit; i++ {
-		if err := b.GenerateBlockAndAdvanceChain(&backend.SimulatedObjects{}, privKeys); err != nil {
-			t.Fatalf("Could not generate block and transition state successfully %v for slot %d", err, b.State().Slot+1)
-		}
-		inMemBlocks := b.InMemoryBlocks()
-		if err := beaconDb.SaveBlock(inMemBlocks[len(inMemBlocks)-1]); err != nil {
-			t.Fatalf("Unable to save block %v", err)
-		}
-		if err := beaconDb.UpdateChainHead(ctx, inMemBlocks[len(inMemBlocks)-1], b.State()); err != nil {
-			t.Fatalf("Unable to save block %v", err)
-		}
-		if err := beaconDb.SaveFinalizedBlock(inMemBlocks[len(inMemBlocks)-1]); err != nil {
-			t.Fatalf("Unable to save finalized state: %v", err)
-		}
-	}
-
-	if err := beaconDb.SaveFinalizedState(b.State()); err != nil {
-		t.Fatalf("Unable to save finalized state: %v", err)
-	}
-
-	// Run the chain for another 30 slots so that we can have this at the current head.
-	for i := uint64(0); i < slotLimit; i++ {
-		if err := b.GenerateBlockAndAdvanceChain(&backend.SimulatedObjects{}, privKeys); err != nil {
-			t.Fatalf("Could not generate block and transition state successfully %v for slot %d", err, b.State().Slot+1)
-		}
-		inMemBlocks := b.InMemoryBlocks()
-		if err := beaconDb.SaveBlock(inMemBlocks[len(inMemBlocks)-1]); err != nil {
-			t.Fatalf("Unable to save block %v", err)
-		}
-		if err := beaconDb.UpdateChainHead(ctx, inMemBlocks[len(inMemBlocks)-1], b.State()); err != nil {
-			t.Fatalf("Unable to save block %v", err)
-		}
-	}
-
-	// Ran 30 slots to save finalized slot then ran another 30 slots.
-	slotToGenerateTill := params.BeaconConfig().GenesisSlot + slotLimit*2
-	newState, err := stategenerator.GenerateStateFromBlock(context.Background(), beaconDb, slotToGenerateTill)
-	if err != nil {
-		t.Fatalf("Unable to generate new state from previous finalized state %v", err)
-	}
-
-	if newState.Slot != b.State().Slot {
-		t.Fatalf("The generated state and the current state do not have the same slot, expected: %d but got %d",
-			b.State().Slot, newState.Slot)
-	}
-
-	if !proto.Equal(newState, b.State()) {
-		t.Error("Generated and saved states are unequal")
-	}
-}
-
-func TestGenerateState_WithNilBlocksOK(t *testing.T) {
-	b, err := backend.NewSimulatedBackend()
-	if err != nil {
-		t.Fatalf("Could not create a new simulated backend %v", err)
-	}
-	privKeys, err := b.SetupBackend(100)
-	if err != nil {
-		t.Fatalf("Could not set up backend %v", err)
-	}
-	beaconDb := b.DB()
-	defer b.Shutdown()
-	defer db.TeardownDB(beaconDb)
-	ctx := context.Background()
-
-	slotLimit := uint64(30)
-
-	// Run the simulated chain for 30 slots, to get a state that we can save as finalized.
-	for i := uint64(0); i < slotLimit; i++ {
-		if err := b.GenerateBlockAndAdvanceChain(&backend.SimulatedObjects{}, privKeys); err != nil {
-			t.Fatalf("Could not generate block and transition state successfully %v for slot %d", err, b.State().Slot+1)
-		}
-		inMemBlocks := b.InMemoryBlocks()
-		if err := beaconDb.SaveBlock(inMemBlocks[len(inMemBlocks)-1]); err != nil {
-			t.Fatalf("Unable to save block %v", err)
-		}
-		if err := beaconDb.UpdateChainHead(ctx, inMemBlocks[len(inMemBlocks)-1], b.State()); err != nil {
-			t.Fatalf("Unable to save block %v", err)
-		}
-		if err := beaconDb.SaveFinalizedBlock(inMemBlocks[len(inMemBlocks)-1]); err != nil {
-			t.Fatalf("Unable to save finalized state: %v", err)
-		}
-	}
-
-	if err := beaconDb.SaveFinalizedState(b.State()); err != nil {
-		t.Fatalf("Unable to save finalized state")
-	}
-
-	slotsWithNil := uint64(10)
-
-	// Run the chain for 10 slots with nil blocks.
-	for i := uint64(0); i < slotsWithNil; i++ {
-		if err := b.GenerateNilBlockAndAdvanceChain(); err != nil {
-			t.Fatalf("Could not generate block and transition state successfully %v for slot %d", err, b.State().Slot+1)
-		}
-	}
-
-	for i := uint64(0); i < slotLimit-slotsWithNil; i++ {
-		if err := b.GenerateBlockAndAdvanceChain(&backend.SimulatedObjects{}, privKeys); err != nil {
-			t.Fatalf("Could not generate block and transition state successfully %v for slot %d", err, b.State().Slot+1)
-		}
-		inMemBlocks := b.InMemoryBlocks()
-		if err := beaconDb.SaveBlock(inMemBlocks[len(inMemBlocks)-1]); err != nil {
-			t.Fatalf("Unable to save block %v", err)
-		}
-		if err := beaconDb.UpdateChainHead(ctx, inMemBlocks[len(inMemBlocks)-1], b.State()); err != nil {
-			t.Fatalf("Unable to save block %v", err)
-		}
-	}
-
-	// Ran 30 slots to save finalized slot then ran another 10 slots w/o blocks and 20 slots w/ blocks.
-	slotToGenerateTill := params.BeaconConfig().GenesisSlot + slotLimit*2
-	newState, err := stategenerator.GenerateStateFromBlock(context.Background(), beaconDb, slotToGenerateTill)
-	if err != nil {
-		t.Fatalf("Unable to generate new state from previous finalized state %v", err)
-	}
-
-	if newState.Slot != b.State().Slot {
-		t.Fatalf("The generated state and the current state do not have the same slot, expected: %d but got %d",
-			b.State().Slot, newState.Slot)
-	}
-
-	if !proto.Equal(newState, b.State()) {
-		t.Error("generated and saved states are unequal")
-	}
-}
-
-func TestGenerateState_NilLatestFinalizedBlock(t *testing.T) {
-	b, err := backend.NewSimulatedBackend()
-	if err != nil {
-		t.Fatalf("Could not create a new simulated backend %v", err)
-	}
-	beaconDB := b.DB()
-	defer b.Shutdown()
-	defer db.TeardownDB(beaconDB)
-	beaconState := &pb.BeaconState{
-		Slot: params.BeaconConfig().GenesisSlot + params.BeaconConfig().SlotsPerEpoch*4,
-	}
-	if err := beaconDB.SaveFinalizedState(beaconState); err != nil {
-		t.Fatalf("Unable to save finalized state")
-	}
-	if err := beaconDB.SaveHistoricalState(context.Background(), beaconState); err != nil {
-		t.Fatalf("Unable to save finalized state")
-	}
-
-	slot := params.BeaconConfig().GenesisSlot + 1 + params.BeaconConfig().SlotsPerEpoch*4
-	want := "latest head in state is nil"
-	if _, err := stategenerator.GenerateStateFromBlock(context.Background(), beaconDB, slot); !strings.Contains(err.Error(), want) {
-		t.Errorf("Expected %v, received %v", want, err)
-	}
-}

beacon-chain/blockchain/testing/BUILD.bazel

@@ -0,0 +1,29 @@
+load("@prysm//tools/go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    testonly = True,
+    srcs = ["mock.go"],
+    importpath = "github.com/prysmaticlabs/prysm/beacon-chain/blockchain/testing",
+    visibility = [
+        "//beacon-chain:__subpackages__",
+        "//fuzz:__pkg__",
+    ],
+    deps = [
+        "//beacon-chain/core/epoch/precompute:go_default_library",
+        "//beacon-chain/core/feed/block:go_default_library",
+        "//beacon-chain/core/feed/operation:go_default_library",
+        "//beacon-chain/core/feed/state:go_default_library",
+        "//beacon-chain/core/helpers:go_default_library",
+        "//beacon-chain/db:go_default_library",
+        "//beacon-chain/forkchoice/protoarray:go_default_library",
+        "//beacon-chain/state:go_default_library",
+        "//beacon-chain/state/stateutil:go_default_library",
+        "//proto/beacon/p2p/v1:go_default_library",
+        "//shared/event:go_default_library",
+        "//shared/params:go_default_library",
+        "@com_github_pkg_errors//:go_default_library",
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:go_default_library",
+        "@com_github_sirupsen_logrus//:go_default_library",
+    ],
+)

beacon-chain/blockchain/testing/mock.go

@@ -0,0 +1,295 @@
+// Package testing includes useful mocks for writing unit
+// tests which depend on logic from the blockchain package.
+package testing
+
+import (
+	"bytes"
+	"context"
+	"time"
+
+	"github.com/pkg/errors"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute"
+	blockfeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/block"
+	opfeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/operation"
+	statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/beacon-chain/db"
+	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state/stateutil"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+	"github.com/prysmaticlabs/prysm/shared/event"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/sirupsen/logrus"
+)
+
+// ChainService defines the mock interface for testing
+type ChainService struct {
+	State                       *stateTrie.BeaconState
+	Root                        []byte
+	Block                       *ethpb.SignedBeaconBlock
+	FinalizedCheckPoint         *ethpb.Checkpoint
+	CurrentJustifiedCheckPoint  *ethpb.Checkpoint
+	PreviousJustifiedCheckPoint *ethpb.Checkpoint
+	BlocksReceived              []*ethpb.SignedBeaconBlock
+	Balance                     *precompute.Balance
+	Genesis                     time.Time
+	ValidatorsRoot              [32]byte
+	Fork                        *pb.Fork
+	ETH1Data                    *ethpb.Eth1Data
+	DB                          db.Database
+	stateNotifier               statefeed.Notifier
+	blockNotifier               blockfeed.Notifier
+	opNotifier                  opfeed.Notifier
+	ValidAttestation            bool
+	ForkChoiceStore             *protoarray.Store
+}
+
+// StateNotifier mocks the same method in the chain service.
+func (ms *ChainService) StateNotifier() statefeed.Notifier {
+	if ms.stateNotifier == nil {
+		ms.stateNotifier = &MockStateNotifier{}
+	}
+	return ms.stateNotifier
+}
+
+// BlockNotifier mocks the same method in the chain service.
+func (ms *ChainService) BlockNotifier() blockfeed.Notifier {
+	if ms.blockNotifier == nil {
+		ms.blockNotifier = &MockBlockNotifier{}
+	}
+	return ms.blockNotifier
+}
+
+// MockBlockNotifier mocks the block notifier.
+type MockBlockNotifier struct {
+	feed *event.Feed
+}
+
+// BlockFeed returns a block feed.
+func (msn *MockBlockNotifier) BlockFeed() *event.Feed {
+	if msn.feed == nil {
+		msn.feed = new(event.Feed)
+	}
+	return msn.feed
+}
+
+// MockStateNotifier mocks the state notifier.
+type MockStateNotifier struct {
+	feed *event.Feed
+}
+
+// StateFeed returns a state feed.
+func (msn *MockStateNotifier) StateFeed() *event.Feed {
+	if msn.feed == nil {
+		msn.feed = new(event.Feed)
+	}
+	return msn.feed
+}
+
+// OperationNotifier mocks the same method in the chain service.
+func (ms *ChainService) OperationNotifier() opfeed.Notifier {
+	if ms.opNotifier == nil {
+		ms.opNotifier = &MockOperationNotifier{}
+	}
+	return ms.opNotifier
+}
+
+// MockOperationNotifier mocks the operation notifier.
+type MockOperationNotifier struct {
+	feed *event.Feed
+}
+
+// OperationFeed returns an operation feed.
+func (mon *MockOperationNotifier) OperationFeed() *event.Feed {
+	if mon.feed == nil {
+		mon.feed = new(event.Feed)
+	}
+	return mon.feed
+}
+
+// ReceiveBlock mocks ReceiveBlock method in chain service.
+func (ms *ChainService) ReceiveBlock(ctx context.Context, block *ethpb.SignedBeaconBlock, blockRoot [32]byte) error {
+	return nil
+}
+
+// ReceiveBlockInitialSync mocks ReceiveBlockInitialSync method in chain service.
+func (ms *ChainService) ReceiveBlockInitialSync(ctx context.Context, block *ethpb.SignedBeaconBlock, blockRoot [32]byte) error {
+	if ms.State == nil {
+		ms.State = &stateTrie.BeaconState{}
+	}
+	if !bytes.Equal(ms.Root, block.Block.ParentRoot) {
+		return errors.Errorf("wanted %#x but got %#x", ms.Root, block.Block.ParentRoot)
+	}
+	if err := ms.State.SetSlot(block.Block.Slot); err != nil {
+		return err
+	}
+	ms.BlocksReceived = append(ms.BlocksReceived, block)
+	signingRoot, err := stateutil.BlockRoot(block.Block)
+	if err != nil {
+		return err
+	}
+	if ms.DB != nil {
+		if err := ms.DB.SaveBlock(ctx, block); err != nil {
+			return err
+		}
+		logrus.Infof("Saved block with root: %#x at slot %d", signingRoot, block.Block.Slot)
+	}
+	ms.Root = signingRoot[:]
+	ms.Block = block
+	return nil
+}
+
+// ReceiveBlockNoPubsub mocks ReceiveBlockNoPubsub method in chain service.
+func (ms *ChainService) ReceiveBlockNoPubsub(ctx context.Context, block *ethpb.SignedBeaconBlock, blockRoot [32]byte) error {
+	if ms.State == nil {
+		ms.State = &stateTrie.BeaconState{}
+	}
+	if !bytes.Equal(ms.Root, block.Block.ParentRoot) {
+		return errors.Errorf("wanted %#x but got %#x", ms.Root, block.Block.ParentRoot)
+	}
+	if err := ms.State.SetSlot(block.Block.Slot); err != nil {
+		return err
+	}
+	ms.BlocksReceived = append(ms.BlocksReceived, block)
+	signingRoot, err := stateutil.BlockRoot(block.Block)
+	if err != nil {
+		return err
+	}
+	if ms.DB != nil {
+		if err := ms.DB.SaveBlock(ctx, block); err != nil {
+			return err
+		}
+		logrus.Infof("Saved block with root: %#x at slot %d", signingRoot, block.Block.Slot)
+	}
+	ms.Root = signingRoot[:]
+	ms.Block = block
+	return nil
+}
+
+// HeadSlot mocks HeadSlot method in chain service.
+func (ms *ChainService) HeadSlot() uint64 {
+	if ms.State == nil {
+		return 0
+	}
+	return ms.State.Slot()
+}
+
+// HeadRoot mocks HeadRoot method in chain service.
+func (ms *ChainService) HeadRoot(ctx context.Context) ([]byte, error) {
+	return ms.Root, nil
+
+}
+
+// HeadBlock mocks HeadBlock method in chain service.
+func (ms *ChainService) HeadBlock(context.Context) (*ethpb.SignedBeaconBlock, error) {
+	return ms.Block, nil
+}
+
+// HeadState mocks HeadState method in chain service.
+func (ms *ChainService) HeadState(context.Context) (*stateTrie.BeaconState, error) {
+	return ms.State, nil
+}
+
+// CurrentFork mocks HeadState method in chain service.
+func (ms *ChainService) CurrentFork() *pb.Fork {
+	return ms.Fork
+}
+
+// FinalizedCheckpt mocks FinalizedCheckpt method in chain service.
+func (ms *ChainService) FinalizedCheckpt() *ethpb.Checkpoint {
+	return ms.FinalizedCheckPoint
+}
+
+// CurrentJustifiedCheckpt mocks CurrentJustifiedCheckpt method in chain service.
+func (ms *ChainService) CurrentJustifiedCheckpt() *ethpb.Checkpoint {
+	return ms.CurrentJustifiedCheckPoint
+}
+
+// PreviousJustifiedCheckpt mocks PreviousJustifiedCheckpt method in chain service.
+func (ms *ChainService) PreviousJustifiedCheckpt() *ethpb.Checkpoint {
+	return ms.PreviousJustifiedCheckPoint
+}
+
+// ReceiveAttestation mocks ReceiveAttestation method in chain service.
+func (ms *ChainService) ReceiveAttestation(context.Context, *ethpb.Attestation) error {
+	return nil
+}
+
+// ReceiveAttestationNoPubsub mocks ReceiveAttestationNoPubsub method in chain service.
+func (ms *ChainService) ReceiveAttestationNoPubsub(context.Context, *ethpb.Attestation) error {
+	return nil
+}
+
+// AttestationPreState mocks AttestationPreState method in chain service.
+func (ms *ChainService) AttestationPreState(ctx context.Context, att *ethpb.Attestation) (*stateTrie.BeaconState, error) {
+	return ms.State, nil
+}
+
+// HeadValidatorsIndices mocks the same method in the chain service.
+func (ms *ChainService) HeadValidatorsIndices(ctx context.Context, epoch uint64) ([]uint64, error) {
+	if ms.State == nil {
+		return []uint64{}, nil
+	}
+	return helpers.ActiveValidatorIndices(ms.State, epoch)
+}
+
+// HeadSeed mocks the same method in the chain service.
+func (ms *ChainService) HeadSeed(ctx context.Context, epoch uint64) ([32]byte, error) {
+	return helpers.Seed(ms.State, epoch, params.BeaconConfig().DomainBeaconAttester)
+}
+
+// HeadETH1Data provides the current ETH1Data of the head state.
+func (ms *ChainService) HeadETH1Data() *ethpb.Eth1Data {
+	return ms.ETH1Data
+}
+
+// ProtoArrayStore mocks the same method in the chain service.
+func (ms *ChainService) ProtoArrayStore() *protoarray.Store {
+	return ms.ForkChoiceStore
+}
+
+// GenesisTime mocks the same method in the chain service.
+func (ms *ChainService) GenesisTime() time.Time {
+	return ms.Genesis
+}
+
+// GenesisValidatorRoot mocks the same method in the chain service.
+func (ms *ChainService) GenesisValidatorRoot() [32]byte {
+	return ms.ValidatorsRoot
+}
+
+// CurrentSlot mocks the same method in the chain service.
+func (ms *ChainService) CurrentSlot() uint64 {
+	return uint64(time.Now().Unix()-ms.Genesis.Unix()) / params.BeaconConfig().SecondsPerSlot
+}
+
+// Participation mocks the same method in the chain service.
+func (ms *ChainService) Participation(epoch uint64) *precompute.Balance {
+	return ms.Balance
+}
+
+// IsValidAttestation always returns true.
+func (ms *ChainService) IsValidAttestation(ctx context.Context, att *ethpb.Attestation) bool {
+	return ms.ValidAttestation
+}
+
+// IsCanonical returns and determines whether a block with the provided root is part of
+// the canonical chain.
+func (ms *ChainService) IsCanonical(ctx context.Context, blockRoot [32]byte) (bool, error) {
+	return true, nil
+}
+
+// ClearCachedStates does nothing.
+func (ms *ChainService) ClearCachedStates() {}
+
+// HasInitSyncBlock mocks the same method in the chain service.
+func (ms *ChainService) HasInitSyncBlock(root [32]byte) bool {
+	return false
+}
+
+// HeadGenesisValidatorRoot mocks HeadGenesisValidatorRoot method in chain service.
+func (ms *ChainService) HeadGenesisValidatorRoot() [32]byte {
+	return [32]byte{}
+}

beacon-chain/cache/BUILD.bazel

@@ -1,28 +1,65 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
+load("@prysm//tools/go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_test")
 
 go_library(
     name = "go_default_library",
     srcs = [
-        "block.go",
+        "attestation_data.go",
+        "checkpoint_state.go",
         "committee.go",
+        "common.go",
+        "doc.go",
+        "hot_state_cache.go",
+        "skip_slot_cache.go",
+        "state_summary.go",
+        "subnet_ids.go",
     ],
     importpath = "github.com/prysmaticlabs/prysm/beacon-chain/cache",
-    visibility = ["//beacon-chain:__subpackages__"],
+    visibility = [
+        "//beacon-chain:__subpackages__",
+        "//fuzz:__pkg__",
+        "//tools:__subpackages__",
+    ],
     deps = [
+        "//beacon-chain/state:go_default_library",
         "//proto/beacon/p2p/v1:go_default_library",
+        "//shared/featureconfig:go_default_library",
+        "//shared/hashutil:go_default_library",
         "//shared/params:go_default_library",
+        "//shared/sliceutil:go_default_library",
+        "@com_github_hashicorp_golang_lru//:go_default_library",
+        "@com_github_patrickmn_go_cache//:go_default_library",
         "@com_github_prometheus_client_golang//prometheus:go_default_library",
         "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:go_default_library",
         "@io_k8s_client_go//tools/cache:go_default_library",
+        "@io_opencensus_go//trace:go_default_library",
     ],
 )
 
 go_test(
     name = "go_default_test",
+    size = "small",
     srcs = [
-        "block_test.go",
+        "attestation_data_test.go",
+        "checkpoint_state_test.go",
+        "committee_fuzz_test.go",
         "committee_test.go",
+        "feature_flag_test.go",
+        "hot_state_cache_test.go",
+        "skip_slot_cache_test.go",
+        "subnet_ids_test.go",
     ],
     embed = [":go_default_library"],
-    deps = ["//proto/beacon/p2p/v1:go_default_library"],
+    deps = [
+        "//beacon-chain/state:go_default_library",
+        "//proto/beacon/p2p/v1:go_default_library",
+        "//shared/bytesutil:go_default_library",
+        "//shared/featureconfig:go_default_library",
+        "//shared/hashutil:go_default_library",
+        "//shared/params:go_default_library",
+        "@com_github_gogo_protobuf//proto:go_default_library",
+        "@com_github_google_gofuzz//:go_default_library",
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:go_default_library",
+    ],
 )

beacon-chain/cache/attestation_data.go

@@ -0,0 +1,179 @@
+package cache
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"math"
+	"sync"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/shared/featureconfig"
+	"k8s.io/client-go/tools/cache"
+)
+
+var (
+	// Delay parameters
+	minDelay    = float64(10)        // 10 nanoseconds
+	maxDelay    = float64(100000000) // 0.1 second
+	delayFactor = 1.1
+
+	// Metrics
+	attestationCacheMiss = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "attestation_cache_miss",
+		Help: "The number of attestation data requests that aren't present in the cache.",
+	})
+	attestationCacheHit = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "attestation_cache_hit",
+		Help: "The number of attestation data requests that are present in the cache.",
+	})
+	attestationCacheSize = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "attestation_cache_size",
+		Help: "The number of attestation data in the attestations cache",
+	})
+)
+
+// ErrAlreadyInProgress appears when attempting to mark a cache as in progress while it is
+// already in progress. The client should handle this error and wait for the in progress
+// data to resolve via Get.
+var ErrAlreadyInProgress = errors.New("already in progress")
+
+// AttestationCache is used to store the cached results of an AttestationData request.
+type AttestationCache struct {
+	cache      *cache.FIFO
+	lock       sync.RWMutex
+	inProgress map[string]bool
+}
+
+// NewAttestationCache initializes the map and underlying cache.
+func NewAttestationCache() *AttestationCache {
+	return &AttestationCache{
+		cache:      cache.NewFIFO(wrapperToKey),
+		inProgress: make(map[string]bool),
+	}
+}
+
+// Get waits for any in progress calculation to complete before returning a
+// cached response, if any.
+func (c *AttestationCache) Get(ctx context.Context, req *ethpb.AttestationDataRequest) (*ethpb.AttestationData, error) {
+	if req == nil {
+		return nil, errors.New("nil attestation data request")
+	}
+
+	s, e := reqToKey(req)
+	if e != nil {
+		return nil, e
+	}
+
+	delay := minDelay
+
+	// Another identical request may be in progress already. Let's wait until
+	// any in progress request resolves or our timeout is exceeded.
+	for {
+		if ctx.Err() != nil {
+			return nil, ctx.Err()
+		}
+
+		c.lock.RLock()
+		if !c.inProgress[s] {
+			c.lock.RUnlock()
+			break
+		}
+		c.lock.RUnlock()
+
+		// This increasing backoff is to decrease the CPU cycles while waiting
+		// for the in progress boolean to flip to false.
+		time.Sleep(time.Duration(delay) * time.Nanosecond)
+		delay *= delayFactor
+		delay = math.Min(delay, maxDelay)
+	}
+
+	item, exists, err := c.cache.GetByKey(s)
+	if err != nil {
+		return nil, err
+	}
+
+	if exists && item != nil && item.(*attestationReqResWrapper).res != nil {
+		attestationCacheHit.Inc()
+		if featureconfig.Get().ReduceAttesterStateCopy {
+			return state.CopyAttestationData(item.(*attestationReqResWrapper).res), nil
+		}
+		return item.(*attestationReqResWrapper).res, nil
+	}
+	attestationCacheMiss.Inc()
+	return nil, nil
+}
+
+// MarkInProgress a request so that any other similar requests will block on
+// Get until MarkNotInProgress is called.
+func (c *AttestationCache) MarkInProgress(req *ethpb.AttestationDataRequest) error {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	s, e := reqToKey(req)
+	if e != nil {
+		return e
+	}
+	if c.inProgress[s] {
+		return ErrAlreadyInProgress
+	}
+	c.inProgress[s] = true
+	return nil
+}
+
+// MarkNotInProgress will release the lock on a given request. This should be
+// called after put.
+func (c *AttestationCache) MarkNotInProgress(req *ethpb.AttestationDataRequest) error {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	s, e := reqToKey(req)
+	if e != nil {
+		return e
+	}
+	delete(c.inProgress, s)
+	return nil
+}
+
+// Put the response in the cache.
+func (c *AttestationCache) Put(ctx context.Context, req *ethpb.AttestationDataRequest, res *ethpb.AttestationData) error {
+	data := &attestationReqResWrapper{
+		req,
+		res,
+	}
+	if err := c.cache.AddIfNotPresent(data); err != nil {
+		return err
+	}
+	trim(c.cache, maxCacheSize)
+
+	attestationCacheSize.Set(float64(len(c.cache.List())))
+	return nil
+}
+
+func wrapperToKey(i interface{}) (string, error) {
+	w, ok := i.(*attestationReqResWrapper)
+	if !ok {
+		return "", errors.New("key is not of type *attestationReqResWrapper")
+	}
+	if w == nil {
+		return "", errors.New("nil wrapper")
+	}
+	if w.req == nil {
+		return "", errors.New("nil wrapper.request")
+	}
+	return reqToKey(w.req)
+}
+
+func reqToKey(req *ethpb.AttestationDataRequest) (string, error) {
+	if featureconfig.Get().ReduceAttesterStateCopy {
+		return fmt.Sprintf("%d", req.Slot), nil
+	}
+	return fmt.Sprintf("%d-%d", req.CommitteeIndex, req.Slot), nil
+}
+
+type attestationReqResWrapper struct {
+	req *ethpb.AttestationDataRequest
+	res *ethpb.AttestationData
+}

beacon-chain/cache/attestation_data_test.go

@@ -0,0 +1,54 @@
+package cache_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/gogo/protobuf/proto"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
+)
+
+func TestAttestationCache_RoundTrip(t *testing.T) {
+	ctx := context.Background()
+	c := cache.NewAttestationCache()
+
+	req := &ethpb.AttestationDataRequest{
+		CommitteeIndex: 0,
+		Slot:           1,
+	}
+
+	response, err := c.Get(ctx, req)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if response != nil {
+		t.Errorf("Empty cache returned an object: %v", response)
+	}
+
+	if err := c.MarkInProgress(req); err != nil {
+		t.Error(err)
+	}
+
+	res := &ethpb.AttestationData{
+		Target: &ethpb.Checkpoint{Epoch: 5},
+	}
+
+	if err = c.Put(ctx, req, res); err != nil {
+		t.Error(err)
+	}
+
+	if err := c.MarkNotInProgress(req); err != nil {
+		t.Error(err)
+	}
+
+	response, err = c.Get(ctx, req)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if !proto.Equal(response, res) {
+		t.Error("Expected equal protos to return from cache")
+	}
+}

beacon-chain/cache/block.go

@@ -1,104 +0,0 @@
-package cache
-
-import (
-	"errors"
-	"strconv"
-	"sync"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
-	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-	"k8s.io/client-go/tools/cache"
-)
-
-var (
-	// ErrNotAncestorCacheObj will be returned when a cache object is not a pointer to
-	// block ancestor cache obj.
-	ErrNotAncestorCacheObj = errors.New("object is not an ancestor object for cache")
-	// Metrics
-	ancestorBlockCacheMiss = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "ancestor_block_cache_miss",
-		Help: "The number of ancestor block requests that aren't present in the cache.",
-	})
-	ancestorBlockCacheHit = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "ancestor_block_cache_hit",
-		Help: "The number of ancestor block requests that are present in the cache.",
-	})
-	ancestorBlockCacheSize = promauto.NewGauge(prometheus.GaugeOpts{
-		Name: "ancestor_block_cache_size",
-		Help: "The number of ancestor blocks in the ancestorBlock cache",
-	})
-)
-
-// AncestorInfo defines the cached ancestor block object for height.
-type AncestorInfo struct {
-	Height uint64
-	Hash   []byte
-	Target *pb.AttestationTarget
-}
-
-// AncestorBlockCache structs with 1 queue for looking up block ancestor by height.
-type AncestorBlockCache struct {
-	ancestorBlockCache *cache.FIFO
-	lock               sync.RWMutex
-}
-
-// heightKeyFn takes the string representation of the block hash + height as the key
-// for the ancestor of a given block (AncestorInfo).
-func heightKeyFn(obj interface{}) (string, error) {
-	aInfo, ok := obj.(*AncestorInfo)
-	if !ok {
-		return "", ErrNotAncestorCacheObj
-	}
-
-	return string(aInfo.Hash) + strconv.Itoa(int(aInfo.Height)), nil
-}
-
-// NewBlockAncestorCache creates a new block ancestor cache for storing/accessing block ancestor
-// from memory.
-func NewBlockAncestorCache() *AncestorBlockCache {
-	return &AncestorBlockCache{
-		ancestorBlockCache: cache.NewFIFO(heightKeyFn),
-	}
-}
-
-// AncestorBySlot fetches block's ancestor by height. Returns true with a
-// reference to the ancestor block, if exists. Otherwise returns false, nil.
-func (a *AncestorBlockCache) AncestorBySlot(blockHash []byte, height uint64) (*AncestorInfo, error) {
-	a.lock.RLock()
-	defer a.lock.RUnlock()
-
-	obj, exists, err := a.ancestorBlockCache.GetByKey(string(blockHash) + strconv.Itoa(int(height)))
-	if err != nil {
-		return nil, err
-	}
-
-	if exists {
-		ancestorBlockCacheHit.Inc()
-	} else {
-		ancestorBlockCacheMiss.Inc()
-		return nil, nil
-	}
-
-	aInfo, ok := obj.(*AncestorInfo)
-	if !ok {
-		return nil, ErrNotACommitteeInfo
-	}
-
-	return aInfo, nil
-}
-
-// AddBlockAncestor adds block ancestor object to the cache. This method also trims the least
-// recently added ancestor if the cache size has ready the max cache size limit.
-func (a *AncestorBlockCache) AddBlockAncestor(ancestorInfo *AncestorInfo) error {
-	a.lock.Lock()
-	defer a.lock.Unlock()
-
-	if err := a.ancestorBlockCache.AddIfNotPresent(ancestorInfo); err != nil {
-		return err
-	}
-
-	trim(a.ancestorBlockCache, maxCacheSize)
-	ancestorBlockCacheSize.Set(float64(len(a.ancestorBlockCache.ListKeys())))
-	return nil
-}

beacon-chain/cache/block_test.go

@@ -1,111 +0,0 @@
-package cache
-
-import (
-	"reflect"
-	"strconv"
-	"testing"
-
-	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
-)
-
-func TestHeightHeightFn_OK(t *testing.T) {
-	height := uint64(999)
-	hash := []byte{'A'}
-	aInfo := &AncestorInfo{
-		Height: height,
-		Hash:   hash,
-		Target: &pb.AttestationTarget{
-			Slot:      height,
-			BlockRoot: hash,
-		},
-	}
-
-	key, err := heightKeyFn(aInfo)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	strHeightKey := string(aInfo.Target.BlockRoot) + strconv.Itoa(int(aInfo.Target.Slot))
-	if key != strHeightKey {
-		t.Errorf("Incorrect hash key: %s, expected %s", key, strHeightKey)
-	}
-}
-
-func TestHeightKeyFn_InvalidObj(t *testing.T) {
-	_, err := heightKeyFn("bad")
-	if err != ErrNotAncestorCacheObj {
-		t.Errorf("Expected error %v, got %v", ErrNotAncestorCacheObj, err)
-	}
-}
-
-func TestAncestorCache_AncestorInfoByHeight(t *testing.T) {
-	cache := NewBlockAncestorCache()
-
-	height := uint64(123)
-	hash := []byte{'B'}
-	aInfo := &AncestorInfo{
-		Height: height,
-		Hash:   hash,
-		Target: &pb.AttestationTarget{
-			Slot:      height,
-			BlockRoot: hash,
-		},
-	}
-
-	fetchedInfo, err := cache.AncestorBySlot(hash, height)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if fetchedInfo != nil {
-		t.Error("Expected ancestor info not to exist in empty cache")
-	}
-
-	if err := cache.AddBlockAncestor(aInfo); err != nil {
-		t.Fatal(err)
-	}
-	fetchedInfo, err = cache.AncestorBySlot(hash, height)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if fetchedInfo == nil {
-		t.Error("Expected ancestor info to exist")
-	}
-	if fetchedInfo.Height != height {
-		t.Errorf(
-			"Expected fetched slot number to be %d, got %d",
-			aInfo.Target.Slot,
-			fetchedInfo.Target.Slot,
-		)
-	}
-	if !reflect.DeepEqual(fetchedInfo.Target, aInfo.Target) {
-		t.Errorf(
-			"Expected fetched info committee to be %v, got %v",
-			aInfo.Target,
-			fetchedInfo.Target,
-		)
-	}
-}
-
-func TestBlockAncestor_maxSize(t *testing.T) {
-	cache := NewBlockAncestorCache()
-
-	for i := 0; i < maxCacheSize+10; i++ {
-		aInfo := &AncestorInfo{
-			Height: uint64(i),
-			Target: &pb.AttestationTarget{
-				Slot: uint64(i),
-			},
-		}
-		if err := cache.AddBlockAncestor(aInfo); err != nil {
-			t.Fatal(err)
-		}
-	}
-
-	if len(cache.ancestorBlockCache.ListKeys()) != maxCacheSize {
-		t.Errorf(
-			"Expected hash cache key size to be %d, got %d",
-			maxCacheSize,
-			len(cache.ancestorBlockCache.ListKeys()),
-		)
-	}
-}

beacon-chain/cache/checkpoint_state.go

@@ -0,0 +1,119 @@
+package cache
+
+import (
+	"errors"
+	"sync"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/shared/hashutil"
+	"k8s.io/client-go/tools/cache"
+)
+
+var (
+	// ErrNotCheckpointState will be returned when a cache object is not a pointer to
+	// a CheckpointState struct.
+	ErrNotCheckpointState = errors.New("object is not a state by check point struct")
+
+	// maxCheckpointStateSize defines the max number of entries check point to state cache can contain.
+	// Choosing 10 to account for multiple forks, this allows 5 forks per epoch boundary with 2 epochs
+	// window to accept attestation based on latest spec.
+	maxCheckpointStateSize = uint64(10)
+
+	// Metrics.
+	checkpointStateMiss = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "check_point_statecache_miss",
+		Help: "The number of check point state requests that aren't present in the cache.",
+	})
+	checkpointStateHit = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "check_point_state_cache_hit",
+		Help: "The number of check point state requests that are present in the cache.",
+	})
+)
+
+// CheckpointState defines the active validator indices per epoch.
+type CheckpointState struct {
+	Checkpoint *ethpb.Checkpoint
+	State      *stateTrie.BeaconState
+}
+
+// CheckpointStateCache is a struct with 1 queue for looking up state by checkpoint.
+type CheckpointStateCache struct {
+	cache *cache.FIFO
+	lock  sync.RWMutex
+}
+
+// checkpointState takes the checkpoint as the key of the resulting state.
+func checkpointState(obj interface{}) (string, error) {
+	info, ok := obj.(*CheckpointState)
+	if !ok {
+		return "", ErrNotCheckpointState
+	}
+
+	h, err := hashutil.HashProto(info.Checkpoint)
+	if err != nil {
+		return "", err
+	}
+	return string(h[:]), nil
+}
+
+// NewCheckpointStateCache creates a new checkpoint state cache for storing/accessing processed state.
+func NewCheckpointStateCache() *CheckpointStateCache {
+	return &CheckpointStateCache{
+		cache: cache.NewFIFO(checkpointState),
+	}
+}
+
+// StateByCheckpoint fetches state by checkpoint. Returns true with a
+// reference to the CheckpointState info, if exists. Otherwise returns false, nil.
+func (c *CheckpointStateCache) StateByCheckpoint(cp *ethpb.Checkpoint) (*stateTrie.BeaconState, error) {
+	c.lock.RLock()
+	defer c.lock.RUnlock()
+	h, err := hashutil.HashProto(cp)
+	if err != nil {
+		return nil, err
+	}
+
+	obj, exists, err := c.cache.GetByKey(string(h[:]))
+	if err != nil {
+		return nil, err
+	}
+
+	if exists {
+		checkpointStateHit.Inc()
+	} else {
+		checkpointStateMiss.Inc()
+		return nil, nil
+	}
+
+	info, ok := obj.(*CheckpointState)
+	if !ok {
+		return nil, ErrNotCheckpointState
+	}
+
+	// Copy here is unnecessary since the return will only be used to verify attestation signature.
+	return info.State, nil
+}
+
+// AddCheckpointState adds CheckpointState object to the cache. This method also trims the least
+// recently added CheckpointState object if the cache size has ready the max cache size limit.
+func (c *CheckpointStateCache) AddCheckpointState(cp *CheckpointState) error {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	if err := c.cache.AddIfNotPresent(&CheckpointState{
+		Checkpoint: stateTrie.CopyCheckpoint(cp.Checkpoint),
+		State:      cp.State.Copy(),
+	}); err != nil {
+		return err
+	}
+
+	trim(c.cache, maxCheckpointStateSize)
+	return nil
+}
+
+// CheckpointStateKeys returns the keys of the state in cache.
+func (c *CheckpointStateCache) CheckpointStateKeys() []string {
+	return c.cache.ListKeys()
+}

beacon-chain/cache/checkpoint_state_test.go

@@ -0,0 +1,141 @@
+package cache
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/gogo/protobuf/proto"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/hashutil"
+	"github.com/prysmaticlabs/prysm/shared/params"
+)
+
+func TestCheckpointStateCacheKeyFn_OK(t *testing.T) {
+	cp := &ethpb.Checkpoint{Epoch: 1, Root: bytesutil.PadTo([]byte{'A'}, 32)}
+	st, err := stateTrie.InitializeFromProto(&pb.BeaconState{
+		Slot: 64,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	info := &CheckpointState{
+		Checkpoint: cp,
+		State:      st,
+	}
+	key, err := checkpointState(info)
+	if err != nil {
+		t.Fatal(err)
+	}
+	wantedKey, err := hashutil.HashProto(cp)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if key != string(wantedKey[:]) {
+		t.Errorf("Incorrect hash key: %s, expected %s", key, string(wantedKey[:]))
+	}
+}
+
+func TestCheckpointStateCacheKeyFn_InvalidObj(t *testing.T) {
+	_, err := checkpointState("bad")
+	if err != ErrNotCheckpointState {
+		t.Errorf("Expected error %v, got %v", ErrNotCheckpointState, err)
+	}
+}
+
+func TestCheckpointStateCache_StateByCheckpoint(t *testing.T) {
+	cache := NewCheckpointStateCache()
+
+	cp1 := &ethpb.Checkpoint{Epoch: 1, Root: bytesutil.PadTo([]byte{'A'}, 32)}
+	st, err := stateTrie.InitializeFromProto(&pb.BeaconState{
+		GenesisValidatorsRoot: params.BeaconConfig().ZeroHash[:],
+		Slot:                  64,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	info1 := &CheckpointState{
+		Checkpoint: cp1,
+		State:      st,
+	}
+	state, err := cache.StateByCheckpoint(cp1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if state != nil {
+		t.Error("Expected state not to exist in empty cache")
+	}
+
+	if err := cache.AddCheckpointState(info1); err != nil {
+		t.Fatal(err)
+	}
+	state, err = cache.StateByCheckpoint(cp1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !proto.Equal(state.InnerStateUnsafe(), info1.State.InnerStateUnsafe()) {
+		t.Error("incorrectly cached state")
+	}
+
+	cp2 := &ethpb.Checkpoint{Epoch: 2, Root: bytesutil.PadTo([]byte{'B'}, 32)}
+	st2, err := stateTrie.InitializeFromProto(&pb.BeaconState{
+		Slot: 128,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	info2 := &CheckpointState{
+		Checkpoint: cp2,
+		State:      st2,
+	}
+	if err := cache.AddCheckpointState(info2); err != nil {
+		t.Fatal(err)
+	}
+	state, err = cache.StateByCheckpoint(cp2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(state.CloneInnerState(), info2.State.CloneInnerState()) {
+		t.Error("incorrectly cached state")
+	}
+
+	state, err = cache.StateByCheckpoint(cp1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(state.CloneInnerState(), info1.State.CloneInnerState()) {
+		t.Error("incorrectly cached state")
+	}
+}
+
+func TestCheckpointStateCache_MaxSize(t *testing.T) {
+	c := NewCheckpointStateCache()
+	st, err := stateTrie.InitializeFromProto(&pb.BeaconState{
+		Slot: 0,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for i := uint64(0); i < maxCheckpointStateSize+100; i++ {
+		if err := st.SetSlot(i); err != nil {
+			t.Fatal(err)
+		}
+		info := &CheckpointState{
+			Checkpoint: &ethpb.Checkpoint{Epoch: i},
+			State:      st,
+		}
+		if err := c.AddCheckpointState(info); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	if uint64(len(c.cache.ListKeys())) != maxCheckpointStateSize {
+		t.Errorf(
+			"Expected hash cache key size to be %d, got %d",
+			maxCheckpointStateSize,
+			len(c.cache.ListKeys()),
+		)
+	}
+}

beacon-chain/cache/committee.go

@@ -2,126 +2,232 @@ package cache
 
 import (
 	"errors"
-	"strconv"
 	"sync"
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/sliceutil"
 	"k8s.io/client-go/tools/cache"
 )
 
 var (
-	// ErrNotACommitteeInfo will be returned when a cache object is not a pointer to
-	// a committeeInfo struct.
-	ErrNotACommitteeInfo = errors.New("object is not an committee info")
+	// ErrNotCommittee will be returned when a cache object is not a pointer to
+	// a Committee struct.
+	ErrNotCommittee = errors.New("object is not a committee struct")
 
-	// maxCacheSize is 4x of the epoch length for additional cache padding.
-	// Requests should be only accessing committees within defined epoch length.
-	maxCacheSize = int(4 * params.BeaconConfig().SlotsPerEpoch)
+	// maxCommitteesCacheSize defines the max number of shuffled committees on per randao basis can cache.
+	// Due to reorgs, it's good to keep the old cache around for quickly switch over. 10 is a generous
+	// cache size as it considers 3 concurrent branches over 3 epochs.
+	maxCommitteesCacheSize = uint64(10)
 
-	// Metrics
-	committeeCacheMiss = promauto.NewCounter(prometheus.CounterOpts{
+	// CommitteeCacheMiss tracks the number of committee requests that aren't present in the cache.
+	CommitteeCacheMiss = promauto.NewCounter(prometheus.CounterOpts{
 		Name: "committee_cache_miss",
 		Help: "The number of committee requests that aren't present in the cache.",
 	})
-	committeeCacheHit = promauto.NewCounter(prometheus.CounterOpts{
+	// CommitteeCacheHit tracks the number of committee requests that are in the cache.
+	CommitteeCacheHit = promauto.NewCounter(prometheus.CounterOpts{
 		Name: "committee_cache_hit",
 		Help: "The number of committee requests that are present in the cache.",
 	})
-	committeeCacheSize = promauto.NewGauge(prometheus.GaugeOpts{
-		Name: "committee_cache_size",
-		Help: "The number of committees in the committee cache",
-	})
 )
 
-// CommitteeInfo defines the validator committee of slot and shard combinations.
-type CommitteeInfo struct {
-	Committee []uint64
-	Shard     uint64
+// Committees defines the shuffled committees seed.
+type Committees struct {
+	CommitteeCount  uint64
+	Seed            [32]byte
+	ShuffledIndices []uint64
+	SortedIndices   []uint64
+	ProposerIndices []uint64
 }
 
-// CommitteesInSlot specifies how many CommitteeInfos are in a given slot.
-type CommitteesInSlot struct {
-	Slot       uint64
-	Committees []*CommitteeInfo
+// CommitteeCache is a struct with 1 queue for looking up shuffled indices list by seed.
+type CommitteeCache struct {
+	CommitteeCache *cache.FIFO
+	lock           sync.RWMutex
 }
 
-// CommitteesCache structs with 1 queue for looking up committees by slot.
-type CommitteesCache struct {
-	committeesCache *cache.FIFO
-	lock            sync.RWMutex
-}
-
-// slotKeyFn takes the string representation of the slot number as the key
-// for the committees of a given slot (CommitteesInSlot).
-func slotKeyFn(obj interface{}) (string, error) {
-	cInfo, ok := obj.(*CommitteesInSlot)
+// committeeKeyFn takes the seed as the key to retrieve shuffled indices of a committee in a given epoch.
+func committeeKeyFn(obj interface{}) (string, error) {
+	info, ok := obj.(*Committees)
 	if !ok {
-		return "", ErrNotACommitteeInfo
+		return "", ErrNotCommittee
 	}
 
-	return strconv.Itoa(int(cInfo.Slot)), nil
+	return key(info.Seed), nil
 }
 
-// NewCommitteesCache creates a new committee cache for storing/accessing blockInfo from
-// memory.
-func NewCommitteesCache() *CommitteesCache {
-	return &CommitteesCache{
-		committeesCache: cache.NewFIFO(slotKeyFn),
+// NewCommitteesCache creates a new committee cache for storing/accessing shuffled indices of a committee.
+func NewCommitteesCache() *CommitteeCache {
+	return &CommitteeCache{
+		CommitteeCache: cache.NewFIFO(committeeKeyFn),
 	}
 }
 
-// CommitteesInfoBySlot fetches CommitteesInSlot by slot. Returns true with a
-// reference to the committees info, if exists. Otherwise returns false, nil.
-func (c *CommitteesCache) CommitteesInfoBySlot(slot uint64) (*CommitteesInSlot, error) {
+// Committee fetches the shuffled indices by slot and committee index. Every list of indices
+// represent one committee. Returns true if the list exists with slot and committee index. Otherwise returns false, nil.
+func (c *CommitteeCache) Committee(slot uint64, seed [32]byte, index uint64) ([]uint64, error) {
 	c.lock.RLock()
 	defer c.lock.RUnlock()
 
-	obj, exists, err := c.committeesCache.GetByKey(strconv.Itoa(int(slot)))
+	obj, exists, err := c.CommitteeCache.GetByKey(key(seed))
 	if err != nil {
 		return nil, err
 	}
 
 	if exists {
-		committeeCacheHit.Inc()
+		CommitteeCacheHit.Inc()
 	} else {
-		committeeCacheMiss.Inc()
+		CommitteeCacheMiss.Inc()
 		return nil, nil
 	}
 
-	cInfo, ok := obj.(*CommitteesInSlot)
+	item, ok := obj.(*Committees)
 	if !ok {
-		return nil, ErrNotACommitteeInfo
+		return nil, ErrNotCommittee
 	}
 
-	return cInfo, nil
+	committeeCountPerSlot := uint64(1)
+	if item.CommitteeCount/params.BeaconConfig().SlotsPerEpoch > 1 {
+		committeeCountPerSlot = item.CommitteeCount / params.BeaconConfig().SlotsPerEpoch
+	}
+
+	indexOffSet := index + (slot%params.BeaconConfig().SlotsPerEpoch)*committeeCountPerSlot
+	start, end := startEndIndices(item, indexOffSet)
+
+	if end > uint64(len(item.ShuffledIndices)) || end < start {
+		return nil, errors.New("requested index out of bound")
+	}
+
+	return item.ShuffledIndices[start:end], nil
 }
 
-// AddCommittees adds CommitteesInSlot object to the cache. This method also trims the least
-// recently added committeeInfo object if the cache size has ready the max cache size limit.
-func (c *CommitteesCache) AddCommittees(committees *CommitteesInSlot) error {
+// AddCommitteeShuffledList adds Committee shuffled list object to the cache. T
+// his method also trims the least recently list if the cache size has ready the max cache size limit.
+func (c *CommitteeCache) AddCommitteeShuffledList(committees *Committees) error {
 	c.lock.Lock()
 	defer c.lock.Unlock()
 
-	if err := c.committeesCache.AddIfNotPresent(committees); err != nil {
+	if err := c.CommitteeCache.AddIfNotPresent(committees); err != nil {
 		return err
 	}
-
-	trim(c.committeesCache, maxCacheSize)
-	committeeCacheSize.Set(float64(len(c.committeesCache.ListKeys())))
+	trim(c.CommitteeCache, maxCommitteesCacheSize)
 	return nil
 }
 
-// trim the FIFO queue to the maxSize.
-func trim(queue *cache.FIFO, maxSize int) {
-	for s := len(queue.ListKeys()); s > maxSize; s-- {
-		// #nosec G104 popProcessNoopFunc never returns an error
-		_, _ = queue.Pop(popProcessNoopFunc)
+// AddProposerIndicesList updates the committee shuffled list with proposer indices.
+func (c *CommitteeCache) AddProposerIndicesList(seed [32]byte, indices []uint64) error {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+
+	obj, exists, err := c.CommitteeCache.GetByKey(key(seed))
+	if err != nil {
+		return err
+	}
+	if !exists {
+		committees := &Committees{ProposerIndices: indices}
+		if err := c.CommitteeCache.Add(committees); err != nil {
+			return err
+		}
+	} else {
+		committees, ok := obj.(*Committees)
+		if !ok {
+			return ErrNotCommittee
+		}
+		committees.ProposerIndices = indices
+		if err := c.CommitteeCache.Add(committees); err != nil {
+			return err
+		}
 	}
-}
 
-// popProcessNoopFunc is a no-op function that never returns an error.
-func popProcessNoopFunc(obj interface{}) error {
+	trim(c.CommitteeCache, maxCommitteesCacheSize)
 	return nil
 }
+
+// ActiveIndices returns the active indices of a given seed stored in cache.
+func (c *CommitteeCache) ActiveIndices(seed [32]byte) ([]uint64, error) {
+	c.lock.RLock()
+	defer c.lock.RUnlock()
+	obj, exists, err := c.CommitteeCache.GetByKey(key(seed))
+	if err != nil {
+		return nil, err
+	}
+
+	if exists {
+		CommitteeCacheHit.Inc()
+	} else {
+		CommitteeCacheMiss.Inc()
+		return nil, nil
+	}
+
+	item, ok := obj.(*Committees)
+	if !ok {
+		return nil, ErrNotCommittee
+	}
+
+	return item.SortedIndices, nil
+}
+
+// ActiveIndicesCount returns the active indices count of a given seed stored in cache.
+func (c *CommitteeCache) ActiveIndicesCount(seed [32]byte) (int, error) {
+	c.lock.RLock()
+	defer c.lock.RUnlock()
+	obj, exists, err := c.CommitteeCache.GetByKey(key(seed))
+	if err != nil {
+		return 0, err
+	}
+
+	if exists {
+		CommitteeCacheHit.Inc()
+	} else {
+		CommitteeCacheMiss.Inc()
+		return 0, nil
+	}
+
+	item, ok := obj.(*Committees)
+	if !ok {
+		return 0, ErrNotCommittee
+	}
+
+	return len(item.SortedIndices), nil
+}
+
+// ProposerIndices returns the proposer indices of a given seed.
+func (c *CommitteeCache) ProposerIndices(seed [32]byte) ([]uint64, error) {
+	c.lock.RLock()
+	defer c.lock.RUnlock()
+	obj, exists, err := c.CommitteeCache.GetByKey(key(seed))
+	if err != nil {
+		return nil, err
+	}
+
+	if exists {
+		CommitteeCacheHit.Inc()
+	} else {
+		CommitteeCacheMiss.Inc()
+		return nil, nil
+	}
+
+	item, ok := obj.(*Committees)
+	if !ok {
+		return nil, ErrNotCommittee
+	}
+
+	return item.ProposerIndices, nil
+}
+
+func startEndIndices(c *Committees, index uint64) (uint64, uint64) {
+	validatorCount := uint64(len(c.ShuffledIndices))
+	start := sliceutil.SplitOffset(validatorCount, c.CommitteeCount, index)
+	end := sliceutil.SplitOffset(validatorCount, c.CommitteeCount, index+1)
+	return start, end
+}
+
+// Using seed as source for key to handle reorgs in the same epoch.
+// The seed is derived from state's array of randao mixes and epoch value
+// hashed together. This avoids collisions on different validator set. Spec definition:
+// https://github.com/ethereum/eth2.0-specs/blob/v0.9.3/specs/core/0_beacon-chain.md#get_seed
+func key(seed [32]byte) string {
+	return string(seed[:])
+}

beacon-chain/cache/committee_fuzz_test.go

@@ -0,0 +1,68 @@
+package cache
+
+import (
+	"reflect"
+	"testing"
+
+	fuzz "github.com/google/gofuzz"
+)
+
+func TestCommitteeKeyFuzz_OK(t *testing.T) {
+	fuzzer := fuzz.NewWithSeed(0)
+	c := &Committees{}
+
+	for i := 0; i < 100000; i++ {
+		fuzzer.Fuzz(c)
+		k, err := committeeKeyFn(c)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if k != key(c.Seed) {
+			t.Errorf("Incorrect hash k: %s, expected %s", k, key(c.Seed))
+		}
+	}
+}
+
+func TestCommitteeCache_FuzzCommitteesByEpoch(t *testing.T) {
+	cache := NewCommitteesCache()
+	fuzzer := fuzz.NewWithSeed(0)
+	c := &Committees{}
+
+	for i := 0; i < 100000; i++ {
+		fuzzer.Fuzz(c)
+		if err := cache.AddCommitteeShuffledList(c); err != nil {
+			t.Fatal(err)
+		}
+		if _, err := cache.Committee(0, c.Seed, 0); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	if uint64(len(cache.CommitteeCache.ListKeys())) != maxCommitteesCacheSize {
+		t.Error("Incorrect key size")
+	}
+}
+
+func TestCommitteeCache_FuzzActiveIndices(t *testing.T) {
+	cache := NewCommitteesCache()
+	fuzzer := fuzz.NewWithSeed(0)
+	c := &Committees{}
+
+	for i := 0; i < 100000; i++ {
+		fuzzer.Fuzz(c)
+		if err := cache.AddCommitteeShuffledList(c); err != nil {
+			t.Fatal(err)
+		}
+		indices, err := cache.ActiveIndices(c.Seed)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !reflect.DeepEqual(indices, c.SortedIndices) {
+			t.Error("Saved indices not the same")
+		}
+	}
+
+	if uint64(len(cache.CommitteeCache.ListKeys())) != maxCommitteesCacheSize {
+		t.Error("Incorrect key size")
+	}
+}

beacon-chain/cache/committee_test.go

@@ -1,96 +1,219 @@
 package cache
 
 import (
+	"math"
 	"reflect"
+	"sort"
 	"strconv"
 	"testing"
+
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/params"
 )
 
-func TestSlotKeyFn_OK(t *testing.T) {
-	cInfo := &CommitteesInSlot{
-		Slot: 999,
-		Committees: []*CommitteeInfo{
-			{Shard: 1, Committee: []uint64{1, 2, 3}},
-			{Shard: 1, Committee: []uint64{4, 5, 6}},
-		},
+func TestCommitteeKeyFn_OK(t *testing.T) {
+	item := &Committees{
+		CommitteeCount:  1,
+		Seed:            [32]byte{'A'},
+		ShuffledIndices: []uint64{1, 2, 3, 4, 5},
 	}
 
-	key, err := slotKeyFn(cInfo)
+	k, err := committeeKeyFn(item)
 	if err != nil {
 		t.Fatal(err)
 	}
-	strSlot := strconv.Itoa(int(cInfo.Slot))
-	if key != strSlot {
-		t.Errorf("Incorrect hash key: %s, expected %s", key, strSlot)
+	if k != key(item.Seed) {
+		t.Errorf("Incorrect hash k: %s, expected %s", k, key(item.Seed))
 	}
 }
 
-func TestSlotKeyFn_InvalidObj(t *testing.T) {
-	_, err := slotKeyFn("bad")
-	if err != ErrNotACommitteeInfo {
-		t.Errorf("Expected error %v, got %v", ErrNotACommitteeInfo, err)
+func TestCommitteeKeyFn_InvalidObj(t *testing.T) {
+	_, err := committeeKeyFn("bad")
+	if err != ErrNotCommittee {
+		t.Errorf("Expected error %v, got %v", ErrNotCommittee, err)
 	}
 }
 
-func TestCommitteesCache_CommitteesInfoBySlot(t *testing.T) {
+func TestCommitteeCache_CommitteesByEpoch(t *testing.T) {
 	cache := NewCommitteesCache()
 
-	cInfo := &CommitteesInSlot{
-		Slot:       123,
-		Committees: []*CommitteeInfo{{Shard: 456}},
+	item := &Committees{
+		ShuffledIndices: []uint64{1, 2, 3, 4, 5, 6},
+		Seed:            [32]byte{'A'},
+		CommitteeCount:  3,
 	}
 
-	fetchedInfo, err := cache.CommitteesInfoBySlot(cInfo.Slot)
+	slot := params.BeaconConfig().SlotsPerEpoch
+	committeeIndex := uint64(1)
+	indices, err := cache.Committee(slot, item.Seed, committeeIndex)
 	if err != nil {
 		t.Fatal(err)
 	}
-	if fetchedInfo != nil {
-		t.Error("Expected committees info not to exist in empty cache")
+	if indices != nil {
+		t.Error("Expected committee not to exist in empty cache")
 	}
 
-	if err := cache.AddCommittees(cInfo); err != nil {
+	if err := cache.AddCommitteeShuffledList(item); err != nil {
 		t.Fatal(err)
 	}
-	fetchedInfo, err = cache.CommitteesInfoBySlot(cInfo.Slot)
+	wantedIndex := uint64(0)
+	indices, err = cache.Committee(slot, item.Seed, wantedIndex)
 	if err != nil {
 		t.Fatal(err)
 	}
-	if fetchedInfo == nil {
-		t.Error("Expected committee info to exist")
-	}
-	if fetchedInfo.Slot != cInfo.Slot {
+
+	start, end := startEndIndices(item, wantedIndex)
+	if !reflect.DeepEqual(indices, item.ShuffledIndices[start:end]) {
 		t.Errorf(
-			"Expected fetched slot number to be %d, got %d",
-			cInfo.Slot,
-			fetchedInfo.Slot,
-		)
-	}
-	if !reflect.DeepEqual(fetchedInfo.Committees, cInfo.Committees) {
-		t.Errorf(
-			"Expected fetched info committee to be %v, got %v",
-			cInfo.Committees,
-			fetchedInfo.Committees,
+			"Expected fetched active indices to be %v, got %v",
+			indices,
+			item.ShuffledIndices[start:end],
 		)
 	}
 }
 
-func TestBlockCache_maxSize(t *testing.T) {
+func TestCommitteeCache_ActiveIndices(t *testing.T) {
 	cache := NewCommitteesCache()
 
-	for i := 0; i < maxCacheSize+10; i++ {
-		cInfo := &CommitteesInSlot{
-			Slot: uint64(i),
-		}
-		if err := cache.AddCommittees(cInfo); err != nil {
+	item := &Committees{Seed: [32]byte{'A'}, SortedIndices: []uint64{1, 2, 3, 4, 5, 6}}
+	indices, err := cache.ActiveIndices(item.Seed)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if indices != nil {
+		t.Error("Expected committee count not to exist in empty cache")
+	}
+
+	if err := cache.AddCommitteeShuffledList(item); err != nil {
+		t.Fatal(err)
+	}
+
+	indices, err = cache.ActiveIndices(item.Seed)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(indices, item.SortedIndices) {
+		t.Error("Did not receive correct active indices from cache")
+	}
+}
+
+func TestCommitteeCache_ActiveCount(t *testing.T) {
+	cache := NewCommitteesCache()
+
+	item := &Committees{Seed: [32]byte{'A'}, SortedIndices: []uint64{1, 2, 3, 4, 5, 6}}
+	count, err := cache.ActiveIndicesCount(item.Seed)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if count != 0 {
+		t.Error("Expected active count not to exist in empty cache")
+	}
+
+	if err := cache.AddCommitteeShuffledList(item); err != nil {
+		t.Fatal(err)
+	}
+
+	count, err = cache.ActiveIndicesCount(item.Seed)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if count != len(item.SortedIndices) {
+		t.Error("Did not receive correct active acount from cache")
+	}
+}
+
+func TestCommitteeCache_AddProposerIndicesList(t *testing.T) {
+	cache := NewCommitteesCache()
+
+	seed := [32]byte{'A'}
+	indices := []uint64{1, 2, 3, 4, 5}
+	indices, err := cache.ProposerIndices(seed)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if indices != nil {
+		t.Error("Expected committee count not to exist in empty cache")
+	}
+	if err := cache.AddProposerIndicesList(seed, indices); err != nil {
+		t.Fatal(err)
+	}
+	received, err := cache.ProposerIndices(seed)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(indices, received) {
+		t.Error("Did not receive correct proposer indices from cache")
+	}
+
+	item := &Committees{Seed: [32]byte{'B'}, SortedIndices: []uint64{1, 2, 3, 4, 5, 6}}
+	if err := cache.AddCommitteeShuffledList(item); err != nil {
+		t.Fatal(err)
+	}
+	indices, err = cache.ProposerIndices(item.Seed)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if indices != nil {
+		t.Error("Expected committee count not to exist in empty cache")
+	}
+	if err := cache.AddProposerIndicesList(item.Seed, indices); err != nil {
+		t.Fatal(err)
+	}
+	received, err = cache.ProposerIndices(item.Seed)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(indices, received) {
+		t.Error("Did not receive correct proposer indices from cache")
+	}
+
+}
+
+func TestCommitteeCache_CanRotate(t *testing.T) {
+	cache := NewCommitteesCache()
+
+	// Should rotate out all the epochs except 190 through 199.
+	for i := 100; i < 200; i++ {
+		s := []byte(strconv.Itoa(i))
+		item := &Committees{Seed: bytesutil.ToBytes32(s)}
+		if err := cache.AddCommitteeShuffledList(item); err != nil {
 			t.Fatal(err)
 		}
 	}
 
-	if len(cache.committeesCache.ListKeys()) != maxCacheSize {
-		t.Errorf(
-			"Expected hash cache key size to be %d, got %d",
-			maxCacheSize,
-			len(cache.committeesCache.ListKeys()),
-		)
+	k := cache.CommitteeCache.ListKeys()
+	if uint64(len(k)) != maxCommitteesCacheSize {
+		t.Errorf("wanted: %d, got: %d", maxCommitteesCacheSize, len(k))
+	}
+
+	sort.Slice(k, func(i, j int) bool {
+		return k[i] < k[j]
+	})
+	s := bytesutil.ToBytes32([]byte(strconv.Itoa(190)))
+	if k[0] != key(s) {
+		t.Error("incorrect key received for slot 190")
+	}
+	s = bytesutil.ToBytes32([]byte(strconv.Itoa(199)))
+	if k[len(k)-1] != key(s) {
+		t.Error("incorrect key received for slot 199")
+	}
+}
+
+func TestCommitteeCacheOutOfRange(t *testing.T) {
+	cache := NewCommitteesCache()
+	seed := bytesutil.ToBytes32([]byte("foo"))
+	err := cache.CommitteeCache.Add(&Committees{
+		CommitteeCount:  1,
+		Seed:            seed,
+		ShuffledIndices: []uint64{0},
+		SortedIndices:   []uint64{},
+		ProposerIndices: []uint64{},
+	})
+	if err != nil {
+		t.Error(err)
+	}
+	_, err = cache.Committee(0, seed, math.MaxUint64) // Overflow!
+	if err == nil {
+		t.Fatal("Did not fail as expected")
 	}
 }

beacon-chain/cache/common.go

@@ -0,0 +1,29 @@
+package cache
+
+import (
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"k8s.io/client-go/tools/cache"
+)
+
+var (
+	// maxCacheSize is 4x of the epoch length for additional cache padding.
+	// Requests should be only accessing committees within defined epoch length.
+	maxCacheSize = 4 * params.BeaconConfig().SlotsPerEpoch
+)
+
+// trim the FIFO queue to the maxSize.
+func trim(queue *cache.FIFO, maxSize uint64) {
+	for s := uint64(len(queue.ListKeys())); s > maxSize; s-- {
+		_, err := queue.Pop(popProcessNoopFunc)
+		if err != nil {
+			// popProcessNoopFunc never returns an error, but we handle this anyway to make linter
+			// happy.
+			return
+		}
+	}
+}
+
+// popProcessNoopFunc is a no-op function that never returns an error.
+func popProcessNoopFunc(obj interface{}) error {
+	return nil
+}

beacon-chain/cache/depositcache/BUILD.bazel

@@ -0,0 +1,38 @@
+load("@prysm//tools/go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "deposits_cache.go",
+        "pending_deposits.go",
+    ],
+    importpath = "github.com/prysmaticlabs/prysm/beacon-chain/cache/depositcache",
+    visibility = ["//beacon-chain:__subpackages__"],
+    deps = [
+        "//proto/beacon/db:go_default_library",
+        "//shared/bytesutil:go_default_library",
+        "//shared/hashutil:go_default_library",
+        "@com_github_prometheus_client_golang//prometheus:go_default_library",
+        "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:go_default_library",
+        "@com_github_sirupsen_logrus//:go_default_library",
+        "@io_opencensus_go//trace:go_default_library",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = [
+        "deposits_test.go",
+        "pending_deposits_test.go",
+    ],
+    embed = [":go_default_library"],
+    deps = [
+        "//proto/beacon/db:go_default_library",
+        "//shared/bytesutil:go_default_library",
+        "@com_github_gogo_protobuf//proto:go_default_library",
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:go_default_library",
+        "@com_github_sirupsen_logrus//hooks/test:go_default_library",
+    ],
+)

beacon-chain/cache/depositcache/deposits_cache.go

@@ -0,0 +1,173 @@
+// Package depositcache is the source of validator deposits maintained
+// in-memory by the beacon node – deposits processed from the
+// eth1 powchain are then stored in this cache to be accessed by
+// any other service during a beacon node's runtime.
+package depositcache
+
+import (
+	"bytes"
+	"context"
+	"encoding/hex"
+	"math/big"
+	"sort"
+	"sync"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	dbpb "github.com/prysmaticlabs/prysm/proto/beacon/db"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	log "github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
+)
+
+var (
+	historicalDepositsCount = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "beacondb_all_deposits",
+		Help: "The number of total deposits in the beaconDB in-memory database",
+	})
+)
+
+// DepositFetcher defines a struct which can retrieve deposit information from a store.
+type DepositFetcher interface {
+	AllDeposits(ctx context.Context, beforeBlk *big.Int) []*ethpb.Deposit
+	DepositByPubkey(ctx context.Context, pubKey []byte) (*ethpb.Deposit, *big.Int)
+	DepositsNumberAndRootAtHeight(ctx context.Context, blockHeight *big.Int) (uint64, [32]byte)
+}
+
+// DepositCache stores all in-memory deposit objects. This
+// stores all the deposit related data that is required by the beacon-node.
+type DepositCache struct {
+	// Beacon chain deposits in memory.
+	pendingDeposits    []*dbpb.DepositContainer
+	deposits           []*dbpb.DepositContainer
+	depositsLock       sync.RWMutex
+	chainStartDeposits []*ethpb.Deposit
+	chainStartPubkeys  map[string]bool
+}
+
+// NewDepositCache instantiates a new deposit cache
+func NewDepositCache() *DepositCache {
+	return &DepositCache{
+		pendingDeposits:    []*dbpb.DepositContainer{},
+		deposits:           []*dbpb.DepositContainer{},
+		chainStartPubkeys:  make(map[string]bool),
+		chainStartDeposits: make([]*ethpb.Deposit, 0),
+	}
+}
+
+// InsertDeposit into the database. If deposit or block number are nil
+// then this method does nothing.
+func (dc *DepositCache) InsertDeposit(ctx context.Context, d *ethpb.Deposit, blockNum uint64, index int64, depositRoot [32]byte) {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.InsertDeposit")
+	defer span.End()
+	if d == nil {
+		log.WithFields(log.Fields{
+			"block":        blockNum,
+			"deposit":      d,
+			"index":        index,
+			"deposit root": hex.EncodeToString(depositRoot[:]),
+		}).Warn("Ignoring nil deposit insertion")
+		return
+	}
+	dc.depositsLock.Lock()
+	defer dc.depositsLock.Unlock()
+	// Keep the slice sorted on insertion in order to avoid costly sorting on retrieval.
+	heightIdx := sort.Search(len(dc.deposits), func(i int) bool { return dc.deposits[i].Index >= index })
+	newDeposits := append([]*dbpb.DepositContainer{{Deposit: d, Eth1BlockHeight: blockNum, DepositRoot: depositRoot[:], Index: index}}, dc.deposits[heightIdx:]...)
+	dc.deposits = append(dc.deposits[:heightIdx], newDeposits...)
+	historicalDepositsCount.Inc()
+}
+
+// InsertDepositContainers inserts a set of deposit containers into our deposit cache.
+func (dc *DepositCache) InsertDepositContainers(ctx context.Context, ctrs []*dbpb.DepositContainer) {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.InsertDepositContainers")
+	defer span.End()
+	dc.depositsLock.Lock()
+	defer dc.depositsLock.Unlock()
+
+	sort.SliceStable(ctrs, func(i int, j int) bool { return ctrs[i].Index < ctrs[j].Index })
+	dc.deposits = ctrs
+	historicalDepositsCount.Add(float64(len(ctrs)))
+}
+
+// AllDepositContainers returns a list of deposits all historical deposit containers until the given block number.
+func (dc *DepositCache) AllDepositContainers(ctx context.Context) []*dbpb.DepositContainer {
+	ctx, span := trace.StartSpan(ctx, "BeaconDB.AllDepositContainers")
+	defer span.End()
+	dc.depositsLock.RLock()
+	defer dc.depositsLock.RUnlock()
+
+	return dc.deposits
+}
+
+// MarkPubkeyForChainstart sets the pubkey deposit status to true.
+func (dc *DepositCache) MarkPubkeyForChainstart(ctx context.Context, pubkey string) {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.MarkPubkeyForChainstart")
+	defer span.End()
+	dc.chainStartPubkeys[pubkey] = true
+}
+
+// PubkeyInChainstart returns bool for whether the pubkey passed in has deposited.
+func (dc *DepositCache) PubkeyInChainstart(ctx context.Context, pubkey string) bool {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.PubkeyInChainstart")
+	defer span.End()
+	if dc.chainStartPubkeys != nil {
+		return dc.chainStartPubkeys[pubkey]
+	}
+	dc.chainStartPubkeys = make(map[string]bool)
+	return false
+}
+
+// AllDeposits returns a list of deposits all historical deposits until the given block number
+// (inclusive). If no block is specified then this method returns all historical deposits.
+func (dc *DepositCache) AllDeposits(ctx context.Context, beforeBlk *big.Int) []*ethpb.Deposit {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.AllDeposits")
+	defer span.End()
+	dc.depositsLock.RLock()
+	defer dc.depositsLock.RUnlock()
+
+	var deposits []*ethpb.Deposit
+	for _, ctnr := range dc.deposits {
+		if beforeBlk == nil || beforeBlk.Uint64() >= ctnr.Eth1BlockHeight {
+			deposits = append(deposits, ctnr.Deposit)
+		}
+	}
+	return deposits
+}
+
+// DepositsNumberAndRootAtHeight returns number of deposits made prior to blockheight and the
+// root that corresponds to the latest deposit at that blockheight.
+func (dc *DepositCache) DepositsNumberAndRootAtHeight(ctx context.Context, blockHeight *big.Int) (uint64, [32]byte) {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.DepositsNumberAndRootAtHeight")
+	defer span.End()
+	dc.depositsLock.RLock()
+	defer dc.depositsLock.RUnlock()
+	heightIdx := sort.Search(len(dc.deposits), func(i int) bool { return dc.deposits[i].Eth1BlockHeight > blockHeight.Uint64() })
+	// send the deposit root of the empty trie, if eth1follow distance is greater than the time of the earliest
+	// deposit.
+	if heightIdx == 0 {
+		return 0, [32]byte{}
+	}
+	return uint64(heightIdx), bytesutil.ToBytes32(dc.deposits[heightIdx-1].DepositRoot)
+}
+
+// DepositByPubkey looks through historical deposits and finds one which contains
+// a certain public key within its deposit data.
+func (dc *DepositCache) DepositByPubkey(ctx context.Context, pubKey []byte) (*ethpb.Deposit, *big.Int) {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.DepositByPubkey")
+	defer span.End()
+	dc.depositsLock.RLock()
+	defer dc.depositsLock.RUnlock()
+
+	var deposit *ethpb.Deposit
+	var blockNum *big.Int
+	for _, ctnr := range dc.deposits {
+		if bytes.Equal(ctnr.Deposit.Data.PublicKey, pubKey) {
+			deposit = ctnr.Deposit
+			blockNum = big.NewInt(int64(ctnr.Eth1BlockHeight))
+			break
+		}
+	}
+	return deposit, blockNum
+}

beacon-chain/cache/depositcache/deposits_test.go

@@ -0,0 +1,275 @@
+package depositcache
+
+import (
+	"bytes"
+	"context"
+	"math/big"
+	"testing"
+
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	dbpb "github.com/prysmaticlabs/prysm/proto/beacon/db"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	logTest "github.com/sirupsen/logrus/hooks/test"
+)
+
+const nilDepositErr = "Ignoring nil deposit insertion"
+
+var _ = DepositFetcher(&DepositCache{})
+
+func TestBeaconDB_InsertDeposit_LogsOnNilDepositInsertion(t *testing.T) {
+	hook := logTest.NewGlobal()
+	dc := DepositCache{}
+
+	dc.InsertDeposit(context.Background(), nil, 1, 0, [32]byte{})
+
+	if len(dc.deposits) != 0 {
+		t.Fatal("Number of deposits changed")
+	}
+	if hook.LastEntry().Message != nilDepositErr {
+		t.Errorf("Did not log correct message, wanted \"Ignoring nil deposit insertion\", got \"%s\"", hook.LastEntry().Message)
+	}
+}
+
+func TestBeaconDB_InsertDeposit_MaintainsSortedOrderByIndex(t *testing.T) {
+	dc := DepositCache{}
+
+	insertions := []struct {
+		blkNum  uint64
+		deposit *ethpb.Deposit
+		index   int64
+	}{
+		{
+			blkNum:  0,
+			deposit: &ethpb.Deposit{},
+			index:   0,
+		},
+		{
+			blkNum:  0,
+			deposit: &ethpb.Deposit{},
+			index:   3,
+		},
+		{
+			blkNum:  0,
+			deposit: &ethpb.Deposit{},
+			index:   1,
+		},
+		{
+			blkNum:  0,
+			deposit: &ethpb.Deposit{},
+			index:   4,
+		},
+	}
+
+	for _, ins := range insertions {
+		dc.InsertDeposit(context.Background(), ins.deposit, ins.blkNum, ins.index, [32]byte{})
+	}
+
+	expectedIndices := []int64{0, 1, 3, 4}
+	for i, ei := range expectedIndices {
+		if dc.deposits[i].Index != ei {
+			t.Errorf("dc.deposits[%d].Index = %d, wanted %d", i, dc.deposits[i].Index, ei)
+		}
+	}
+}
+
+func TestBeaconDB_AllDeposits_ReturnsAllDeposits(t *testing.T) {
+	dc := DepositCache{}
+
+	deposits := []*dbpb.DepositContainer{
+		{
+			Eth1BlockHeight: 10,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 10,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 10,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 11,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 11,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 12,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 12,
+			Deposit:         &ethpb.Deposit{},
+		},
+	}
+	dc.deposits = deposits
+
+	d := dc.AllDeposits(context.Background(), nil)
+	if len(d) != len(deposits) {
+		t.Errorf("Return the wrong number of deposits (%d) wanted %d", len(d), len(deposits))
+	}
+}
+
+func TestBeaconDB_AllDeposits_FiltersDepositUpToAndIncludingBlockNumber(t *testing.T) {
+	dc := DepositCache{}
+
+	deposits := []*dbpb.DepositContainer{
+		{
+			Eth1BlockHeight: 10,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 10,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 10,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 11,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 11,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 12,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 12,
+			Deposit:         &ethpb.Deposit{},
+		},
+	}
+	dc.deposits = deposits
+
+	d := dc.AllDeposits(context.Background(), big.NewInt(11))
+	expected := 5
+	if len(d) != expected {
+		t.Errorf("Return the wrong number of deposits (%d) wanted %d", len(d), expected)
+	}
+}
+
+func TestBeaconDB_DepositsNumberAndRootAtHeight_ReturnsAppropriateCountAndRoot(t *testing.T) {
+	dc := DepositCache{}
+
+	dc.deposits = []*dbpb.DepositContainer{
+		{
+			Eth1BlockHeight: 10,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 10,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 10,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 10,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 11,
+			Deposit:         &ethpb.Deposit{},
+			DepositRoot:     []byte("root"),
+		},
+		{
+			Eth1BlockHeight: 12,
+			Deposit:         &ethpb.Deposit{},
+		},
+		{
+			Eth1BlockHeight: 12,
+			Deposit:         &ethpb.Deposit{},
+		},
+	}
+
+	n, root := dc.DepositsNumberAndRootAtHeight(context.Background(), big.NewInt(11))
+	if n != 5 {
+		t.Errorf("Returned unexpected deposits number %d wanted %d", n, 5)
+	}
+
+	if root != bytesutil.ToBytes32([]byte("root")) {
+		t.Errorf("Returned unexpected root: %v", root)
+	}
+}
+
+func TestBeaconDB_DepositsNumberAndRootAtHeight_ReturnsEmptyTrieIfBlockHeightLessThanOldestDeposit(t *testing.T) {
+	dc := DepositCache{}
+
+	dc.deposits = []*dbpb.DepositContainer{
+		{
+			Eth1BlockHeight: 10,
+			Deposit:         &ethpb.Deposit{},
+			DepositRoot:     []byte("root"),
+		},
+		{
+			Eth1BlockHeight: 11,
+			Deposit:         &ethpb.Deposit{},
+			DepositRoot:     []byte("root"),
+		},
+	}
+
+	n, root := dc.DepositsNumberAndRootAtHeight(context.Background(), big.NewInt(2))
+	if n != 0 {
+		t.Errorf("Returned unexpected deposits number %d wanted %d", n, 0)
+	}
+
+	if root != [32]byte{} {
+		t.Errorf("Returned unexpected root: %v", root)
+	}
+}
+
+func TestBeaconDB_DepositByPubkey_ReturnsFirstMatchingDeposit(t *testing.T) {
+	dc := DepositCache{}
+
+	dc.deposits = []*dbpb.DepositContainer{
+		{
+			Eth1BlockHeight: 9,
+			Deposit: &ethpb.Deposit{
+				Data: &ethpb.Deposit_Data{
+					PublicKey: []byte("pk0"),
+				},
+			},
+		},
+		{
+			Eth1BlockHeight: 10,
+			Deposit: &ethpb.Deposit{
+				Data: &ethpb.Deposit_Data{
+					PublicKey: []byte("pk1"),
+				},
+			},
+		},
+		{
+			Eth1BlockHeight: 11,
+			Deposit: &ethpb.Deposit{
+				Data: &ethpb.Deposit_Data{
+					PublicKey: []byte("pk1"),
+				},
+			},
+		},
+		{
+			Eth1BlockHeight: 12,
+			Deposit: &ethpb.Deposit{
+				Data: &ethpb.Deposit_Data{
+					PublicKey: []byte("pk2"),
+				},
+			},
+		},
+	}
+
+	dep, blkNum := dc.DepositByPubkey(context.Background(), []byte("pk1"))
+
+	if !bytes.Equal(dep.Data.PublicKey, []byte("pk1")) {
+		t.Error("Returned wrong deposit")
+	}
+	if blkNum.Cmp(big.NewInt(10)) != 0 {
+		t.Errorf("Returned wrong block number %v", blkNum)
+	}
+}

beacon-chain/cache/depositcache/pending_deposits.go

@@ -0,0 +1,165 @@
+package depositcache
+
+import (
+	"context"
+	"math/big"
+	"sort"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	dbpb "github.com/prysmaticlabs/prysm/proto/beacon/db"
+	"github.com/prysmaticlabs/prysm/shared/hashutil"
+	log "github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
+)
+
+var (
+	pendingDepositsCount = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "beacondb_pending_deposits",
+		Help: "The number of pending deposits in the beaconDB in-memory database",
+	})
+)
+
+// PendingDepositsFetcher specifically outlines a struct that can retrieve deposits
+// which have not yet been included in the chain.
+type PendingDepositsFetcher interface {
+	PendingContainers(ctx context.Context, beforeBlk *big.Int) []*dbpb.DepositContainer
+}
+
+// InsertPendingDeposit into the database. If deposit or block number are nil
+// then this method does nothing.
+func (dc *DepositCache) InsertPendingDeposit(ctx context.Context, d *ethpb.Deposit, blockNum uint64, index int64, depositRoot [32]byte) {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.InsertPendingDeposit")
+	defer span.End()
+	if d == nil {
+		log.WithFields(log.Fields{
+			"block":   blockNum,
+			"deposit": d,
+		}).Debug("Ignoring nil deposit insertion")
+		return
+	}
+	dc.depositsLock.Lock()
+	defer dc.depositsLock.Unlock()
+	dc.pendingDeposits = append(dc.pendingDeposits,
+		&dbpb.DepositContainer{Deposit: d, Eth1BlockHeight: blockNum, Index: index, DepositRoot: depositRoot[:]})
+	pendingDepositsCount.Inc()
+	span.AddAttributes(trace.Int64Attribute("count", int64(len(dc.pendingDeposits))))
+}
+
+// PendingDeposits returns a list of deposits until the given block number
+// (inclusive). If no block is specified then this method returns all pending
+// deposits.
+func (dc *DepositCache) PendingDeposits(ctx context.Context, beforeBlk *big.Int) []*ethpb.Deposit {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.PendingDeposits")
+	defer span.End()
+	dc.depositsLock.RLock()
+	defer dc.depositsLock.RUnlock()
+
+	var depositCntrs []*dbpb.DepositContainer
+	for _, ctnr := range dc.pendingDeposits {
+		if beforeBlk == nil || beforeBlk.Uint64() >= ctnr.Eth1BlockHeight {
+			depositCntrs = append(depositCntrs, ctnr)
+		}
+	}
+	// Sort the deposits by Merkle index.
+	sort.SliceStable(depositCntrs, func(i, j int) bool {
+		return depositCntrs[i].Index < depositCntrs[j].Index
+	})
+
+	var deposits []*ethpb.Deposit
+	for _, dep := range depositCntrs {
+		deposits = append(deposits, dep.Deposit)
+	}
+
+	span.AddAttributes(trace.Int64Attribute("count", int64(len(deposits))))
+
+	return deposits
+}
+
+// PendingContainers returns a list of deposit containers until the given block number
+// (inclusive).
+func (dc *DepositCache) PendingContainers(ctx context.Context, beforeBlk *big.Int) []*dbpb.DepositContainer {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.PendingDeposits")
+	defer span.End()
+	dc.depositsLock.RLock()
+	defer dc.depositsLock.RUnlock()
+
+	var depositCntrs []*dbpb.DepositContainer
+	for _, ctnr := range dc.pendingDeposits {
+		if beforeBlk == nil || beforeBlk.Uint64() >= ctnr.Eth1BlockHeight {
+			depositCntrs = append(depositCntrs, ctnr)
+		}
+	}
+	// Sort the deposits by Merkle index.
+	sort.SliceStable(depositCntrs, func(i, j int) bool {
+		return depositCntrs[i].Index < depositCntrs[j].Index
+	})
+
+	span.AddAttributes(trace.Int64Attribute("count", int64(len(depositCntrs))))
+
+	return depositCntrs
+}
+
+// RemovePendingDeposit from the database. The deposit is indexed by the
+// Index. This method does nothing if deposit ptr is nil.
+func (dc *DepositCache) RemovePendingDeposit(ctx context.Context, d *ethpb.Deposit) {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.RemovePendingDeposit")
+	defer span.End()
+
+	if d == nil {
+		log.Debug("Ignoring nil deposit removal")
+		return
+	}
+
+	depRoot, err := hashutil.HashProto(d)
+	if err != nil {
+		log.Errorf("Could not remove deposit %v", err)
+		return
+	}
+
+	dc.depositsLock.Lock()
+	defer dc.depositsLock.Unlock()
+
+	idx := -1
+	for i, ctnr := range dc.pendingDeposits {
+		hash, err := hashutil.HashProto(ctnr.Deposit)
+		if err != nil {
+			log.Errorf("Could not hash deposit %v", err)
+			continue
+		}
+		if hash == depRoot {
+			idx = i
+			break
+		}
+	}
+
+	if idx >= 0 {
+		dc.pendingDeposits = append(dc.pendingDeposits[:idx], dc.pendingDeposits[idx+1:]...)
+		pendingDepositsCount.Dec()
+	}
+}
+
+// PrunePendingDeposits removes any deposit which is older than the given deposit merkle tree index.
+func (dc *DepositCache) PrunePendingDeposits(ctx context.Context, merkleTreeIndex int) {
+	ctx, span := trace.StartSpan(ctx, "DepositsCache.PrunePendingDeposits")
+	defer span.End()
+
+	if merkleTreeIndex == 0 {
+		log.Debug("Ignoring 0 deposit removal")
+		return
+	}
+
+	dc.depositsLock.Lock()
+	defer dc.depositsLock.Unlock()
+
+	var cleanDeposits []*dbpb.DepositContainer
+	for _, dp := range dc.pendingDeposits {
+		if dp.Index >= int64(merkleTreeIndex) {
+			cleanDeposits = append(cleanDeposits, dp)
+		}
+	}
+
+	dc.pendingDeposits = cleanDeposits
+	pendingDepositsCount.Set(float64(len(dc.pendingDeposits)))
+}

beacon-chain/cache/depositcache/pending_deposits_test.go

@@ -0,0 +1,169 @@
+package depositcache
+
+import (
+	"context"
+	"math/big"
+	"reflect"
+	"testing"
+
+	"github.com/gogo/protobuf/proto"
+	ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
+	dbpb "github.com/prysmaticlabs/prysm/proto/beacon/db"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+)
+
+var _ = PendingDepositsFetcher(&DepositCache{})
+
+func TestInsertPendingDeposit_OK(t *testing.T) {
+	dc := DepositCache{}
+	dc.InsertPendingDeposit(context.Background(), &ethpb.Deposit{}, 111, 100, [32]byte{})
+
+	if len(dc.pendingDeposits) != 1 {
+		t.Error("Deposit not inserted")
+	}
+}
+
+func TestInsertPendingDeposit_ignoresNilDeposit(t *testing.T) {
+	dc := DepositCache{}
+	dc.InsertPendingDeposit(context.Background(), nil /*deposit*/, 0 /*blockNum*/, 0, [32]byte{})
+
+	if len(dc.pendingDeposits) > 0 {
+		t.Error("Unexpected deposit insertion")
+	}
+}
+
+func TestRemovePendingDeposit_OK(t *testing.T) {
+	db := DepositCache{}
+	proof1 := make([][]byte, 33)
+	proof1[0] = bytesutil.PadTo([]byte{'A'}, 32)
+	proof2 := make([][]byte, 33)
+	proof2[0] = bytesutil.PadTo([]byte{'A'}, 32)
+	depToRemove := &ethpb.Deposit{Proof: proof1}
+	otherDep := &ethpb.Deposit{Proof: proof2}
+	db.pendingDeposits = []*dbpb.DepositContainer{
+		{Deposit: depToRemove, Index: 1},
+		{Deposit: otherDep, Index: 5},
+	}
+	db.RemovePendingDeposit(context.Background(), depToRemove)
+
+	if len(db.pendingDeposits) != 1 || !proto.Equal(db.pendingDeposits[0].Deposit, otherDep) {
+		t.Error("Failed to remove deposit")
+	}
+}
+
+func TestRemovePendingDeposit_IgnoresNilDeposit(t *testing.T) {
+	dc := DepositCache{}
+	dc.pendingDeposits = []*dbpb.DepositContainer{{Deposit: &ethpb.Deposit{}}}
+	dc.RemovePendingDeposit(context.Background(), nil /*deposit*/)
+	if len(dc.pendingDeposits) != 1 {
+		t.Errorf("Deposit unexpectedly removed")
+	}
+}
+
+func TestPendingDeposit_RoundTrip(t *testing.T) {
+	dc := DepositCache{}
+	proof := make([][]byte, 33)
+	proof[0] = bytesutil.PadTo([]byte{'A'}, 32)
+	dep := &ethpb.Deposit{Proof: proof}
+	dc.InsertPendingDeposit(context.Background(), dep, 111, 100, [32]byte{})
+	dc.RemovePendingDeposit(context.Background(), dep)
+	if len(dc.pendingDeposits) != 0 {
+		t.Error("Failed to insert & delete a pending deposit")
+	}
+}
+
+func TestPendingDeposits_OK(t *testing.T) {
+	dc := DepositCache{}
+
+	dc.pendingDeposits = []*dbpb.DepositContainer{
+		{Eth1BlockHeight: 2, Deposit: &ethpb.Deposit{Proof: [][]byte{[]byte("A")}}},
+		{Eth1BlockHeight: 4, Deposit: &ethpb.Deposit{Proof: [][]byte{[]byte("B")}}},
+		{Eth1BlockHeight: 6, Deposit: &ethpb.Deposit{Proof: [][]byte{[]byte("c")}}},
+	}
+
+	deposits := dc.PendingDeposits(context.Background(), big.NewInt(4))
+	expected := []*ethpb.Deposit{
+		{Proof: [][]byte{[]byte("A")}},
+		{Proof: [][]byte{[]byte("B")}},
+	}
+
+	if !reflect.DeepEqual(deposits, expected) {
+		t.Errorf("Unexpected deposits. got=%+v want=%+v", deposits, expected)
+	}
+
+	all := dc.PendingDeposits(context.Background(), nil)
+	if len(all) != len(dc.pendingDeposits) {
+		t.Error("PendingDeposits(ctx, nil) did not return all deposits")
+	}
+}
+
+func TestPrunePendingDeposits_ZeroMerkleIndex(t *testing.T) {
+	dc := DepositCache{}
+
+	dc.pendingDeposits = []*dbpb.DepositContainer{
+		{Eth1BlockHeight: 2, Index: 2},
+		{Eth1BlockHeight: 4, Index: 4},
+		{Eth1BlockHeight: 6, Index: 6},
+		{Eth1BlockHeight: 8, Index: 8},
+		{Eth1BlockHeight: 10, Index: 10},
+		{Eth1BlockHeight: 12, Index: 12},
+	}
+
+	dc.PrunePendingDeposits(context.Background(), 0)
+	expected := []*dbpb.DepositContainer{
+		{Eth1BlockHeight: 2, Index: 2},
+		{Eth1BlockHeight: 4, Index: 4},
+		{Eth1BlockHeight: 6, Index: 6},
+		{Eth1BlockHeight: 8, Index: 8},
+		{Eth1BlockHeight: 10, Index: 10},
+		{Eth1BlockHeight: 12, Index: 12},
+	}
+	if !reflect.DeepEqual(dc.pendingDeposits, expected) {
+		t.Errorf("Unexpected deposits. got=%+v want=%+v", dc.pendingDeposits, expected)
+	}
+}
+
+func TestPrunePendingDeposits_OK(t *testing.T) {
+	dc := DepositCache{}
+
+	dc.pendingDeposits = []*dbpb.DepositContainer{
+		{Eth1BlockHeight: 2, Index: 2},
+		{Eth1BlockHeight: 4, Index: 4},
+		{Eth1BlockHeight: 6, Index: 6},
+		{Eth1BlockHeight: 8, Index: 8},
+		{Eth1BlockHeight: 10, Index: 10},
+		{Eth1BlockHeight: 12, Index: 12},
+	}
+
+	dc.PrunePendingDeposits(context.Background(), 6)
+	expected := []*dbpb.DepositContainer{
+		{Eth1BlockHeight: 6, Index: 6},
+		{Eth1BlockHeight: 8, Index: 8},
+		{Eth1BlockHeight: 10, Index: 10},
+		{Eth1BlockHeight: 12, Index: 12},
+	}
+
+	if !reflect.DeepEqual(dc.pendingDeposits, expected) {
+		t.Errorf("Unexpected deposits. got=%+v want=%+v", dc.pendingDeposits, expected)
+	}
+
+	dc.pendingDeposits = []*dbpb.DepositContainer{
+		{Eth1BlockHeight: 2, Index: 2},
+		{Eth1BlockHeight: 4, Index: 4},
+		{Eth1BlockHeight: 6, Index: 6},
+		{Eth1BlockHeight: 8, Index: 8},
+		{Eth1BlockHeight: 10, Index: 10},
+		{Eth1BlockHeight: 12, Index: 12},
+	}
+
+	dc.PrunePendingDeposits(context.Background(), 10)
+	expected = []*dbpb.DepositContainer{
+		{Eth1BlockHeight: 10, Index: 10},
+		{Eth1BlockHeight: 12, Index: 12},
+	}
+
+	if !reflect.DeepEqual(dc.pendingDeposits, expected) {
+		t.Errorf("Unexpected deposits. got=%+v want=%+v", dc.pendingDeposits, expected)
+	}
+
+}

beacon-chain/cache/doc.go

@@ -0,0 +1,5 @@
+// Package cache includes all important caches for the runtime
+// of an eth2 beacon node, ensuring the node does not spend
+// resources computing duplicate operations such as committee
+// calculations for validators during the same epoch, etc.
+package cache

beacon-chain/cache/feature_flag_test.go

@@ -0,0 +1,14 @@
+package cache
+
+import (
+	"os"
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/shared/featureconfig"
+)
+
+func TestMain(m *testing.M) {
+	resetCfg := featureconfig.InitWithReset(&featureconfig.Flags{EnableEth1DataVoteCache: true})
+	defer resetCfg()
+	os.Exit(m.Run())
+}

beacon-chain/cache/hot_state_cache.go

@@ -0,0 +1,90 @@
+package cache
+
+import (
+	"sync"
+
+	lru "github.com/hashicorp/golang-lru"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+)
+
+var (
+	// hotStateCacheSize defines the max number of hot state this can cache.
+	hotStateCacheSize = 32
+	// Metrics
+	hotStateCacheHit = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "hot_state_cache_hit",
+		Help: "The total number of cache hits on the hot state cache.",
+	})
+	hotStateCacheMiss = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "hot_state_cache_miss",
+		Help: "The total number of cache misses on the hot state cache.",
+	})
+)
+
+// HotStateCache is used to store the processed beacon state after finalized check point..
+type HotStateCache struct {
+	cache *lru.Cache
+	lock  sync.RWMutex
+}
+
+// NewHotStateCache initializes the map and underlying cache.
+func NewHotStateCache() *HotStateCache {
+	cache, err := lru.New(hotStateCacheSize)
+	if err != nil {
+		panic(err)
+	}
+	return &HotStateCache{
+		cache: cache,
+	}
+}
+
+// Get returns a cached response via input block root, if any.
+// The response is copied by default.
+func (c *HotStateCache) Get(root [32]byte) *stateTrie.BeaconState {
+	c.lock.RLock()
+	defer c.lock.RUnlock()
+	item, exists := c.cache.Get(root)
+
+	if exists && item != nil {
+		hotStateCacheHit.Inc()
+		return item.(*stateTrie.BeaconState).Copy()
+	}
+	hotStateCacheMiss.Inc()
+	return nil
+}
+
+// GetWithoutCopy returns a non-copied cached response via input block root.
+func (c *HotStateCache) GetWithoutCopy(root [32]byte) *stateTrie.BeaconState {
+	c.lock.RLock()
+	defer c.lock.RUnlock()
+	item, exists := c.cache.Get(root)
+	if exists && item != nil {
+		hotStateCacheHit.Inc()
+		return item.(*stateTrie.BeaconState)
+	}
+	hotStateCacheMiss.Inc()
+	return nil
+}
+
+// Put the response in the cache.
+func (c *HotStateCache) Put(root [32]byte, state *stateTrie.BeaconState) {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	c.cache.Add(root, state)
+}
+
+// Has returns true if the key exists in the cache.
+func (c *HotStateCache) Has(root [32]byte) bool {
+	c.lock.RLock()
+	defer c.lock.RUnlock()
+	return c.cache.Contains(root)
+}
+
+// Delete deletes the key exists in the cache.
+func (c *HotStateCache) Delete(root [32]byte) bool {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	return c.cache.Remove(root)
+}

beacon-chain/cache/hot_state_cache_test.go

@@ -0,0 +1,46 @@
+package cache_test
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+)
+
+func TestHotStateCache_RoundTrip(t *testing.T) {
+	c := cache.NewHotStateCache()
+	root := [32]byte{'A'}
+	state := c.Get(root)
+	if state != nil {
+		t.Errorf("Empty cache returned an object: %v", state)
+	}
+	if c.Has(root) {
+		t.Error("Empty cache has an object")
+	}
+
+	state, err := stateTrie.InitializeFromProto(&pb.BeaconState{
+		Slot: 10,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	c.Put(root, state)
+
+	if !c.Has(root) {
+		t.Error("Empty cache does not have an object")
+	}
+	res := c.Get(root)
+	if state == nil {
+		t.Errorf("Empty cache returned an object: %v", state)
+	}
+	if !reflect.DeepEqual(state.CloneInnerState(), res.CloneInnerState()) {
+		t.Error("Expected equal protos to return from cache")
+	}
+
+	c.Delete(root)
+	if c.Has(root) {
+		t.Error("Cache not suppose to have the object")
+	}
+}

beacon-chain/cache/skip_slot_cache.go

@@ -0,0 +1,148 @@
+package cache
+
+import (
+	"context"
+	"math"
+	"sync"
+	"time"
+
+	lru "github.com/hashicorp/golang-lru"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	"go.opencensus.io/trace"
+)
+
+var (
+	// Metrics
+	skipSlotCacheHit = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "skip_slot_cache_hit",
+		Help: "The total number of cache hits on the skip slot cache.",
+	})
+	skipSlotCacheMiss = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "skip_slot_cache_miss",
+		Help: "The total number of cache misses on the skip slot cache.",
+	})
+)
+
+// SkipSlotCache is used to store the cached results of processing skip slots in state.ProcessSlots.
+type SkipSlotCache struct {
+	cache      *lru.Cache
+	lock       sync.RWMutex
+	disabled   bool // Allow for programmatic toggling of the cache, useful during initial sync.
+	inProgress map[uint64]bool
+}
+
+// NewSkipSlotCache initializes the map and underlying cache.
+func NewSkipSlotCache() *SkipSlotCache {
+	cache, err := lru.New(8)
+	if err != nil {
+		panic(err)
+	}
+	return &SkipSlotCache{
+		cache:      cache,
+		inProgress: make(map[uint64]bool),
+	}
+}
+
+// Enable the skip slot cache.
+func (c *SkipSlotCache) Enable() {
+	c.disabled = false
+}
+
+// Disable the skip slot cache.
+func (c *SkipSlotCache) Disable() {
+	c.disabled = true
+}
+
+// Get waits for any in progress calculation to complete before returning a
+// cached response, if any.
+func (c *SkipSlotCache) Get(ctx context.Context, slot uint64) (*stateTrie.BeaconState, error) {
+	ctx, span := trace.StartSpan(ctx, "skipSlotCache.Get")
+	defer span.End()
+	if c.disabled {
+		// Return a miss result if cache is not enabled.
+		skipSlotCacheMiss.Inc()
+		return nil, nil
+	}
+
+	delay := minDelay
+
+	// Another identical request may be in progress already. Let's wait until
+	// any in progress request resolves or our timeout is exceeded.
+	inProgress := false
+	for {
+		if ctx.Err() != nil {
+			return nil, ctx.Err()
+		}
+
+		c.lock.RLock()
+		if !c.inProgress[slot] {
+			c.lock.RUnlock()
+			break
+		}
+		inProgress = true
+		c.lock.RUnlock()
+
+		// This increasing backoff is to decrease the CPU cycles while waiting
+		// for the in progress boolean to flip to false.
+		time.Sleep(time.Duration(delay) * time.Nanosecond)
+		delay *= delayFactor
+		delay = math.Min(delay, maxDelay)
+	}
+	span.AddAttributes(trace.BoolAttribute("inProgress", inProgress))
+
+	item, exists := c.cache.Get(slot)
+
+	if exists && item != nil {
+		skipSlotCacheHit.Inc()
+		span.AddAttributes(trace.BoolAttribute("hit", true))
+		return item.(*stateTrie.BeaconState).Copy(), nil
+	}
+	skipSlotCacheMiss.Inc()
+	span.AddAttributes(trace.BoolAttribute("hit", false))
+	return nil, nil
+}
+
+// MarkInProgress a request so that any other similar requests will block on
+// Get until MarkNotInProgress is called.
+func (c *SkipSlotCache) MarkInProgress(slot uint64) error {
+	if c.disabled {
+		return nil
+	}
+
+	c.lock.Lock()
+	defer c.lock.Unlock()
+
+	if c.inProgress[slot] {
+		return ErrAlreadyInProgress
+	}
+	c.inProgress[slot] = true
+	return nil
+}
+
+// MarkNotInProgress will release the lock on a given request. This should be
+// called after put.
+func (c *SkipSlotCache) MarkNotInProgress(slot uint64) error {
+	if c.disabled {
+		return nil
+	}
+
+	c.lock.Lock()
+	defer c.lock.Unlock()
+
+	delete(c.inProgress, slot)
+	return nil
+}
+
+// Put the response in the cache.
+func (c *SkipSlotCache) Put(ctx context.Context, slot uint64, state *stateTrie.BeaconState) error {
+	if c.disabled {
+		return nil
+	}
+
+	// Copy state so cached value is not mutated.
+	c.cache.Add(slot, state.Copy())
+
+	return nil
+}

beacon-chain/cache/skip_slot_cache_test.go

@@ -0,0 +1,53 @@
+package cache_test
+
+import (
+	"context"
+	"reflect"
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
+	stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+)
+
+func TestSkipSlotCache_RoundTrip(t *testing.T) {
+	ctx := context.Background()
+	c := cache.NewSkipSlotCache()
+
+	state, err := c.Get(ctx, 5)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if state != nil {
+		t.Errorf("Empty cache returned an object: %v", state)
+	}
+
+	if err := c.MarkInProgress(5); err != nil {
+		t.Error(err)
+	}
+
+	state, err = stateTrie.InitializeFromProto(&pb.BeaconState{
+		Slot: 10,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err = c.Put(ctx, 5, state); err != nil {
+		t.Error(err)
+	}
+
+	if err := c.MarkNotInProgress(5); err != nil {
+		t.Error(err)
+	}
+
+	res, err := c.Get(ctx, 5)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if !reflect.DeepEqual(state.CloneInnerState(), res.CloneInnerState()) {
+		t.Error("Expected equal protos to return from cache")
+	}
+}

beacon-chain/cache/state_summary.go

@@ -0,0 +1,65 @@
+package cache
+
+import (
+	"sync"
+
+	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
+)
+
+// StateSummaryCache caches state summary object.
+type StateSummaryCache struct {
+	initSyncStateSummaries     map[[32]byte]*pb.StateSummary
+	initSyncStateSummariesLock sync.RWMutex
+}
+
+// NewStateSummaryCache creates a new state summary cache.
+func NewStateSummaryCache() *StateSummaryCache {
+	return &StateSummaryCache{
+		initSyncStateSummaries: make(map[[32]byte]*pb.StateSummary),
+	}
+}
+
+// Put saves a state summary to the initial sync state summaries cache.
+func (s *StateSummaryCache) Put(r [32]byte, b *pb.StateSummary) {
+	s.initSyncStateSummariesLock.Lock()
+	defer s.initSyncStateSummariesLock.Unlock()
+	s.initSyncStateSummaries[r] = b
+}
+
+// Has checks if a state summary exists in the initial sync state summaries cache using the root
+// of the block.
+func (s *StateSummaryCache) Has(r [32]byte) bool {
+	s.initSyncStateSummariesLock.RLock()
+	defer s.initSyncStateSummariesLock.RUnlock()
+	_, ok := s.initSyncStateSummaries[r]
+	return ok
+}
+
+// Get retrieves a state summary from the initial sync state summaries cache using the root of
+// the block.
+func (s *StateSummaryCache) Get(r [32]byte) *pb.StateSummary {
+	s.initSyncStateSummariesLock.RLock()
+	defer s.initSyncStateSummariesLock.RUnlock()
+	b := s.initSyncStateSummaries[r]
+	return b
+}
+
+// GetAll retrieves all the beacon state summaries from the initial sync state summaries cache, the returned
+// state summaries are unordered.
+func (s *StateSummaryCache) GetAll() []*pb.StateSummary {
+	s.initSyncStateSummariesLock.RLock()
+	defer s.initSyncStateSummariesLock.RUnlock()
+
+	blks := make([]*pb.StateSummary, 0, len(s.initSyncStateSummaries))
+	for _, b := range s.initSyncStateSummaries {
+		blks = append(blks, b)
+	}
+	return blks
+}
+
+// Clear clears out the initial sync state summaries cache.
+func (s *StateSummaryCache) Clear() {
+	s.initSyncStateSummariesLock.Lock()
+	defer s.initSyncStateSummariesLock.Unlock()
+	s.initSyncStateSummaries = make(map[[32]byte]*pb.StateSummary)
+}