State/V2: getters (#9228)

* Add state v2 getters

* Update BUILD.bazel

beacon-chain/state/v2/BUILD.bazel

@@ -3,7 +3,9 @@ load("@prysm//tools/go:def.bzl", "go_library", "go_test")
 go_library(
     name = "go_default_library",
     srcs = [
+        "deprecated_getters.go",
         "field_trie.go",
+        "getters.go",
         "state_trie.go",
         "types.go",
     ],
@@ -23,12 +25,18 @@ go_library(
         "//tools/pcli:__pkg__",
     ],
     deps = [
+        "//beacon-chain/state:go_default_library",
         "//beacon-chain/state/stateutil:go_default_library",
         "//beacon-chain/state/v1:go_default_library",
         "//proto/prysm/v1alpha1:go_default_library",
         "//proto/prysm/v2/state:go_default_library",
+        "//shared/bytesutil:go_default_library",
+        "//shared/copyutil:go_default_library",
         "//shared/params:go_default_library",
+        "//shared/version:go_default_library",
         "@com_github_pkg_errors//:go_default_library",
+        "@com_github_prysmaticlabs_eth2_types//:go_default_library",
+        "@com_github_prysmaticlabs_go_bitfield//:go_default_library",
         "@org_golang_google_protobuf//proto:go_default_library",
     ],
 )
@@ -36,7 +44,9 @@ go_library(
 go_test(
     name = "go_default_test",
     srcs = [
+        "deprecated_getters_test.go",
         "field_trie_test.go",
+        "getters_test.go",
         "state_trie_test.go",
     ],
     embed = [":go_default_library"],

beacon-chain/state/v2/deprecated_getters.go

@@ -0,0 +1,16 @@
+package v2
+
+import (
+	"github.com/pkg/errors"
+	statepb "github.com/prysmaticlabs/prysm/proto/prysm/v2/state"
+)
+
+// PreviousEpochAttestations is not supported for HF1 beacon state.
+func (b *BeaconState) PreviousEpochAttestations() ([]*statepb.PendingAttestation, error) {
+	return nil, errors.New("PreviousEpochAttestations is not supported for hard fork 1 beacon state")
+}
+
+// CurrentEpochAttestations is not supported for HF1 beacon state.
+func (b *BeaconState) CurrentEpochAttestations() ([]*statepb.PendingAttestation, error) {
+	return nil, errors.New("CurrentEpochAttestations is not supported for hard fork 1 beacon state")
+}

beacon-chain/state/v2/deprecated_getters_test.go

@@ -0,0 +1,19 @@
+package v2
+
+import (
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/shared/testutil/require"
+)
+
+func TestBeaconState_CurrentEpochAttestations(t *testing.T) {
+	s := &BeaconState{}
+	_, err := s.CurrentEpochAttestations()
+	require.ErrorContains(t, "CurrentEpochAttestations is not supported for hard fork 1 beacon state", err)
+}
+
+func TestBeaconState_PreviousEpochAttestations(t *testing.T) {
+	s := &BeaconState{}
+	_, err := s.PreviousEpochAttestations()
+	require.ErrorContains(t, "PreviousEpochAttestations is not supported for hard fork 1 beacon state", err)
+}

beacon-chain/state/v2/getters_test.go

@@ -0,0 +1,66 @@
+package v2
+
+import (
+	"runtime/debug"
+	"testing"
+)
+
+func TestNilState_NoPanic(t *testing.T) {
+	var st *BeaconState
+	defer func() {
+		if r := recover(); r != nil {
+			t.Errorf("Method panicked when it was not supposed to: %v\n%v\n", r, string(debug.Stack()))
+		}
+	}()
+	// retrieve elements from nil state
+	_ = st.GenesisTime()
+	_ = st.GenesisValidatorRoot()
+	_ = st.GenesisUnixTime()
+	_ = st.GenesisValidatorRoot()
+	_ = st.Slot()
+	_ = st.Fork()
+	_ = st.LatestBlockHeader()
+	_ = st.ParentRoot()
+	_ = st.BlockRoots()
+	_, err := st.BlockRootAtIndex(0)
+	_ = err
+	_ = st.StateRoots()
+	_ = st.HistoricalRoots()
+	_ = st.Eth1Data()
+	_ = st.Eth1DataVotes()
+	_ = st.Eth1DepositIndex()
+	_, err = st.ValidatorAtIndex(0)
+	_ = err
+	_, err = st.ValidatorAtIndexReadOnly(0)
+	_ = err
+	_, _ = st.ValidatorIndexByPubkey([48]byte{})
+	_ = st.PubkeyAtIndex(0)
+	_ = st.NumValidators()
+	_ = st.Balances()
+	_, err = st.BalanceAtIndex(0)
+	_ = err
+	_ = st.BalancesLength()
+	_ = st.RandaoMixes()
+	_, err = st.RandaoMixAtIndex(0)
+	_ = err
+	_ = st.RandaoMixesLength()
+	_ = st.Slashings()
+	_, err = st.CurrentEpochParticipation()
+	_ = err
+	_, err = st.PreviousEpochParticipation()
+	_ = err
+	_ = st.JustificationBits()
+	_ = st.PreviousJustifiedCheckpoint()
+	_ = st.CurrentJustifiedCheckpoint()
+	_ = st.FinalizedCheckpoint()
+	_, err = st.CurrentEpochParticipation()
+	_ = err
+	_, err = st.PreviousEpochParticipation()
+	_ = err
+	_, err = st.InactivityScores()
+	_ = err
+	_, err = st.CurrentSyncCommittee()
+	_ = err
+	_, err = st.NextSyncCommittee()
+	_ = err
+}