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https://github.com/extism/extism.git
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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.
26 lines
809 B
Bash
Executable File
26 lines
809 B
Bash
Executable File
#!/usr/bin/env bash
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export CARGO_FLAGS=""
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while getopts d flag
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do
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case "${flag}" in
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d)
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echo "Disabled bounds-checking";
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export CARGO_FLAGS="--no-default-features";;
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*)
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echo "usage $0 [-d]"
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echo "\t-d: build with bounds checking disabled"
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exit 1
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esac
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done
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cargo build --package extism-runtime-kernel --bin extism-runtime --release --target wasm32-unknown-unknown $CARGO_FLAGS
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cp target/wasm32-unknown-unknown/release/extism-runtime.wasm .
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wasm-tools parse extism-context.wat -o extism-context.wasm
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wasm-merge --enable-reference-types ./extism-runtime.wasm runtime extism-context.wasm context -o ../runtime/src/extism-runtime.wasm
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rm extism-context.wasm
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rm extism-runtime.wasm
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wasm-strip ../runtime/src/extism-runtime.wasm
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