compile WebAssembly in CI

.github/workflows/ci.yaml

@@ -52,6 +52,12 @@ jobs:
         run: |
           make build/libllhttp.a
 
+      - name: Upload build
+        uses: actions/upload-artifact@50769540e7f4bd5e21e526ee35c689e35e0d6874 # v4.4.0
+        with:
+          name: build-${{ runner.os }}
+          path: build/
+
   test:
     name: Run tests
     runs-on: ${{ matrix.os }}
@@ -116,3 +122,36 @@ jobs:
 
       - name: Run lint command
         run: npm run lint
+
+  build-wasm:
+    name: Build WebAssembly
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch code
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+        with:
+          fetch-depth: 1
+
+      - name: Restore node_modules cache for Linux
+        uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2
+        if: runner.os == 'Linux'
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+
+      - name: Install dependencies
+        run: npm ci --ignore-scripts
+
+      - name: Prepare build
+        run: npm run prebuild-wasm
+
+      - name: Build
+        run: npm run build-wasm
+
+      - name: Upload build
+        uses: actions/upload-artifact@50769540e7f4bd5e21e526ee35c689e35e0d6874 # v4.4.0
+        with:
+          name: build-wasm
+          path: build/

Dockerfile

@@ -2,7 +2,7 @@ FROM node:22-alpine@sha256:ed9736a13b88ba55cbc08c75c9edac8ae7f72840482e40324670b
 ARG UID=1000
 ARG GID=1000
 
-RUN apk add -U clang lld wasi-sdk && mkdir /home/node/llhttp
+RUN apk add -U clang lld wasi-sdk bash && mkdir /home/node/llhttp
 
 WORKDIR /home/node/llhttp
 

bin/build_wasm.sh

@@ -0,0 +1,88 @@
+#!/usr/bin/env bash
+
+set -e
+
+cd "$(dirname "$0")/../"
+
+if [[ -z "$WASM_PLATFORM" && -n "$1" ]]; then
+    WASM_PLATFORM=$(docker info -f "{{.OSType}}/{{.Architecture}}")
+fi
+
+case "$1" in
+    --prebuild)
+        exec docker build --platform="$WASM_PLATFORM" -t llhttp_wasm_builder . --load
+        ;;
+    --setup)
+        mkdir -p build
+        exit 0
+        ;;
+    --docker)
+        cmd=(docker run --rm --platform="$WASM_PLATFORM")
+        if [[ -z "$CI" ]]; then
+            cmd+=(-it)
+        fi
+        # Try to avoid root permission problems on compiled assets
+        # when running on linux.
+        # It will work flawessly if uid === gid === 1000
+        # there will be some warnings otherwise.
+        if [[ "$(uname)" == Linux ]]; then
+            cmd+=(--user "$(id -u):$(id -g)")
+        fi
+        cmd+=(--mount "type=bind,source=./build,target=/home/node/llhttp/build" llhttp_wasm_builder npm run wasm)
+
+        echo "> ${cmd[*]}"
+        exec "${cmd[@]}"
+        ;;
+esac
+
+out=build/wasm
+mkdir -p "$out"
+
+npm run build
+
+# shellcheck disable=SC2054 # the commas are intentional
+CFLAGS=(
+    --sysroot=/usr/share/wasi-sysroot
+    -target wasm32-unknown-wasi
+    -Ofast
+    -fno-exceptions
+    -fvisibility=hidden
+    -mexec-model=reactor
+    -Wl,-error-limit=0
+    -Wl,-O3
+    -Wl,--lto-O3
+    -Wl,--strip-all
+    -Wl,--allow-undefined
+    -Wl,--export-dynamic
+    -Wl,--export-table
+    -Wl,--export=malloc
+    -Wl,--export=free
+    -Wl,--no-entry
+    build/c/*.c
+    src/native/*.c
+    -Ibuild
+)
+
+clang "${CFLAGS[@]}" -mno-bulk-memory -mno-multivalue -mno-relaxed-simd -mno-sign-ext -mno-simd128 -o "$out/llhttp_baseline.wasm"
+clang "${CFLAGS[@]}"    -mbulk-memory    -mmultivalue    -mrelaxed-simd    -msign-ext    -msimd128 -o "$out/llhttp_opt.wasm"
+
+js_template="'use strict'
+const { Buffer } = require('node:buffer')
+const wasmBase64 = '%s'
+let wasmBuffer
+Object.defineProperty(module, 'exports', {
+  get: () => {
+    return wasmBuffer
+      ? wasmBuffer
+      : (wasmBuffer = Buffer.from(wasmBase64, 'base64'))
+  }
+})
+"
+
+
+# shellcheck disable=SC2059 # I want to use the variable
+printf "$js_template" "$(base64 -w0 "$out/llhttp_baseline.wasm")" > "$out/llhttp_baseline.js"
+# shellcheck disable=SC2059 
+printf "$js_template" "$(base64 -w0 "$out/llhttp_opt.wasm")" > "$out/llhttp_opt.js"
+
+cp lib/llhttp/{constants,utils}.* "$out/"

package.json

@@ -6,15 +6,16 @@
   "types": "lib/llhttp.d.ts",
   "files": [
     "lib",
-    "src"
+    "src",
+    "build"
   ],
   "scripts": {
     "bench": "ts-node bench/",
     "build": "ts-node bin/generate.ts",
     "build-ts": "tsc",
     "prebuild-wasm": "npm run wasm -- --prebuild && npm run wasm -- --setup",
     "build-wasm": "npm run wasm -- --docker",
-    "wasm": "ts-node bin/build_wasm.ts",
+    "wasm": "bash bin/build_wasm.sh",
     "clean": "rm -rf lib && rm -rf test/tmp",
     "prepare": "npm run clean && npm run build-ts",
     "test": "node -r ts-node/register/type-check ./test/md-test.ts",

src/native/api.c

@@ -57,29 +57,14 @@ static int wasm_on_headers_complete_wrap(llhttp_t* p) {
 }
 
 const llhttp_settings_t wasm_settings = {
-  wasm_on_message_begin,
-  wasm_on_url,
-  wasm_on_status,
-  NULL,
-  NULL,
-  wasm_on_header_field,
-  wasm_on_header_value,
-  NULL,
-  NULL,
-  wasm_on_headers_complete_wrap,
-  wasm_on_body,
-  wasm_on_message_complete,
-  NULL,
-  NULL,
-  NULL,
-  NULL,
-  NULL,
-  NULL,
-  NULL,
-  NULL,
-  NULL,
-  NULL,
-  NULL,
+  .on_message_begin = wasm_on_message_begin,
+  .on_url = wasm_on_url,
+  .on_status = wasm_on_status,
+  .on_header_field = wasm_on_header_field,
+  .on_header_value = wasm_on_header_value,
+  .on_headers_complete = wasm_on_headers_complete_wrap,
+  .on_body = wasm_on_body,
+  .on_message_complete = wasm_on_message_complete,
 };