mirror of
https://github.com/extism/extism.git
synced 2026-01-08 21:38:13 -05:00
5d9c8c5d05
Add `plugin.call_with_host_context` and `current_plugin.host_context` methods, enabling per-call context to be looped from the guest invocation to any host functions it calls. In an HTTP server environment, this enables re-using a plugin across multiple requests while switching out backing connections and user information in host functions. (Imagine a host function, `update_user` -- previously the plugin would have to have been aware of the user to pass to the host function. Now that information is ambient.) This is a backwards-compatible change and requires no changes to existing plugins. Implement by adding a global, mutable externref to the extism kernel. Since most programming languages, including Rust, don't let you define these natively, we accomplish this by using `wasm-merge` to combine the kernel Wasm with Wasm generated by a WAT file containing only the global. (This pattern might be useful for other Wasm constructs we can't use directly from Rust, like `v128` in argument parameters.) Wasmtime requires extern refs to be `Any + Send + Sync + 'static`; we additionally add `Clone`. I haven't tried this with an `Arc` directly, but it should work at least for container structs that hold `Arc`'s themselves.
52 lines
1.5 KiB
YAML
52 lines
1.5 KiB
YAML
on:
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workflow_dispatch:
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pull_request:
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paths:
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- kernel/**
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name: Kernel
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jobs:
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kernel:
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name: Build extism-runtime.wasm
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v3
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- name: Install Rust
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uses: actions-rs/toolchain@v1
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with:
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toolchain: stable
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profile: minimal
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target: wasm32-unknown-unknown
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- uses: Swatinem/rust-cache@v2
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- name: install wasm-tools
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uses: bytecodealliance/actions/wasm-tools/setup@v1
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- name: Install deps
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run: |
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sudo apt install wabt --yes
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- name: Build kernel
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shell: bash
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continue-on-error: true
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run: |
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cd kernel
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sh build.sh
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git diff --exit-code
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export GIT_EXIT_CODE=$?
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- uses: peter-evans/create-pull-request@v5
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env:
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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if: ${{ env.GIT_EXIT_CODE }} != 0
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with:
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author: "zshipko <zshipko@users.noreply.github.com>"
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title: "update(kernel): extism-runtime.wasm in ${{ github.event.pull_request.head.ref }}"
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body: "Automated PR to update `runtime/src/extism-runtime.wasm` in PR #${{ github.event.number }}"
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base: "${{ github.event.pull_request.head.ref }}"
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branch: "update-kernel--${{ github.event.pull_request.head.ref }}"
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commit-message: "update(kernel): extism-runtime.wasm in ${{ github.event.pull_request.head.ref }}"
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delete-branch: true
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