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The wasip2 component only ran with `wasmtime serve -S cli=y`, because Rust's std
imports `wasi:cli/environment` at startup and the bare proxy world does not
provide it. I documented that rather than claiming portability we did not have;
this closes it.
build-proxy.sh compiles a wasm32-wasip1 core module and adapts it with the
Bytecode Alliance proxy adapter. The resulting component imports only what the
proxy world defines — wasi:http/types, wasi:io/*, wasi:cli/std{in,out,err},
wasi:random — with no wasi:cli/environment, so it runs on any wasi:http host with
no host flags. Verified: `wasmtime serve` with no -S serves /health and returns
statevector_hash 25a7d930… for grover, identical to native and to the wasip2
build.
The script guards the property it exists to provide: it greps the component's own
world and fails the build if wasi:cli/environment ever reappears, so a future
dependency cannot silently reintroduce the flag requirement. The adapter is
cached per wasmtime version rather than vendored, since it is tied to a WASI
version and must match the host.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
45 lines
2.1 KiB
Shell
Executable file
45 lines
2.1 KiB
Shell
Executable file
#!/usr/bin/env bash
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# Build wai-quantum-serve as a PURE `wasi:http/proxy` component.
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#
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# Why this exists: a plain `--target wasm32-wasip2` build imports
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# `wasi:cli/environment` (Rust's std pulls it in at startup), which the bare
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# proxy world does not provide — so it only runs with `wasmtime serve -S cli=y`.
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# Building a wasip1 core module and adapting it with the Bytecode Alliance's
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# proxy adapter produces a component whose imports all sit inside the proxy
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# world, so it runs on ANY wasi:http host with no host flags.
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set -euo pipefail
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# Keep this in step with the wasmtime you serve with: the adapter is tied to a
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# WASI version, and a mismatch shows up as an unresolved-import error.
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WASMTIME_VERSION="${WASMTIME_VERSION:-v48.0.1}"
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CACHE="${WASI_ADAPTER_CACHE:-$HOME/.cache/wasi-adapters}"
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ADAPTER="$CACHE/wasi_snapshot_preview1.proxy.$WASMTIME_VERSION.wasm"
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OUT="${1:-target/wai_quantum_serve.proxy.wasm}"
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command -v wasm-tools >/dev/null || { echo "need wasm-tools (cargo install wasm-tools)" >&2; exit 1; }
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rustup target list --installed | grep -qx wasm32-wasip1 || rustup target add wasm32-wasip1
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if [ ! -f "$ADAPTER" ]; then
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mkdir -p "$CACHE"
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url="https://github.com/bytecodealliance/wasmtime/releases/download/$WASMTIME_VERSION/wasi_snapshot_preview1.proxy.wasm"
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echo "fetching proxy adapter $WASMTIME_VERSION"
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node -e '
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const fs=require("fs");
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(async()=>{const r=await fetch(process.argv[1],{redirect:"follow"});
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if(!r.ok){console.error("download failed",r.status);process.exit(1);}
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fs.writeFileSync(process.argv[2],Buffer.from(await r.arrayBuffer()));})();
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' "$url" "$ADAPTER"
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fi
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cargo build --release --target wasm32-wasip1
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wasm-tools component new target/wasm32-wasip1/release/wai_quantum_serve.wasm \
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--adapt "wasi_snapshot_preview1=$ADAPTER" -o "$OUT"
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# Fail loudly if anything outside the proxy world crept back in.
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if wasm-tools component wit "$OUT" | grep -q "wasi:cli/environment"; then
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echo "ERROR: component still imports wasi:cli/environment — not a proxy-world component" >&2
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exit 1
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fi
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echo "built $OUT"
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echo "run: wasmtime serve --addr 127.0.0.1:8080 $OUT # no -S flags needed"
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