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Remove wasm render plugin example
This commit is contained in:
Lunny Xiao
parent
63fc35ea22
commit
40ddacfe4f
@ -1,56 +0,0 @@
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# Go + WASM Render Plugin Example
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This example shows how to build a frontend render plugin whose heavy lifting
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runs inside a WebAssembly module compiled from Go. The plugin loads the WASM
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binary in the browser, asks Go to post-process the fetched file content, and
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then renders the result inside the file viewer.
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## Files
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- `manifest.json` — plugin metadata consumed by the Gitea backend
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- `render.js` — the ES module entry point that initializes the Go runtime and
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renders files handled by the plugin
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- `wasm/` — contains the Go source that compiles to `plugin.wasm`
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- `wasm_exec.js` — the Go runtime shim required by all Go-generated WASM
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binaries (copied verbatim from the Go distribution)
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- `build.sh` — helper script that builds `plugin.wasm` and produces a zip
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archive ready for upload
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As with other plugins, declare any Gitea endpoints or external hosts the WASM
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module needs to call inside the `permissions` array in `manifest.json`. Without
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an explicit entry, the plugin may only download the file that is currently being
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rendered.
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## Build & Install
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1. Build the WASM binary and zip archive:
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```bash
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cd contrib/render-plugins/example-wasm
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./build.sh
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```
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The script requires Go 1.21+ on your PATH. It stores the compiled WASM and
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an installable `example-go-wasm.zip` under `dist/`.
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2. In the Gitea web UI, visit `Site Administration → Render Plugins`, upload
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`dist/example-go-wasm.zip`, and enable the plugin.
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3. Open any file whose name ends with `.wasmnote`; the viewer will show the
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processed output from the Go code running inside WebAssembly.
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## How It Works
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- `wasm/main.go` exposes a single `wasmProcessFile` function to JavaScript. It
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uppercases each line, prefixes it with the line number, and runs entirely
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inside WebAssembly compiled from Go.
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- `render.js` injects the Go runtime (`wasm_exec.js`), instantiates the compiled
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module, and caches the exported `wasmProcessFile` function.
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- During initialization the frontend passes the sniffed MIME type and the first
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1 KiB of file data to the plugin (`options.mimeType`/`options.headChunk`),
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allowing renderers to make decisions without issuing extra network requests.
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- During rendering the plugin downloads the target file, passes the contents to
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Go, and displays the transformed text with minimal styling.
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Feel free to modify the Go source or the JS wrapper to experiment with richer
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interfaces between JavaScript and WebAssembly.
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@ -1,26 +0,0 @@
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#!/usr/bin/env bash
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set -euo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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cd "$SCRIPT_DIR"
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BUILD_DIR="$SCRIPT_DIR/.build"
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DIST_DIR="$SCRIPT_DIR/dist"
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ARCHIVE_NAME="example-go-wasm.zip"
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rm -rf "$BUILD_DIR"
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mkdir -p "$BUILD_DIR" "$DIST_DIR"
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export GOOS=js
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export GOARCH=wasm
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echo "[+] Building Go WASM binary..."
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go build -o "$BUILD_DIR/plugin.wasm" ./wasm
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cp manifest.json "$BUILD_DIR/"
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cp render.js "$BUILD_DIR/"
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cp wasm_exec.js "$BUILD_DIR/"
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( cd "$BUILD_DIR" && zip -q "../dist/$ARCHIVE_NAME" manifest.json render.js wasm_exec.js plugin.wasm )
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echo "[+] Wrote $DIST_DIR/$ARCHIVE_NAME"
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@ -1,12 +0,0 @@
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{
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"schemaVersion": 1,
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"id": "example-go-wasm",
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"name": "Example Go WASM Renderer",
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"version": "0.1.0",
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"description": "Demonstrates calling a Go-compiled WebAssembly module inside a Gitea render plugin.",
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"entry": "render.js",
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"filePatterns": [
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"*.wasmnote"
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],
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"permissions": []
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}
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@ -1,163 +0,0 @@
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const wasmUrl = new URL('plugin.wasm', import.meta.url);
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const wasmExecUrl = new URL('wasm_exec.js', import.meta.url);
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let wasmBridgePromise;
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let styleInjected = false;
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function injectScriptOnce(url) {
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return new Promise((resolve, reject) => {
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const existing = document.querySelector(`script[data-go-runtime="${url.href}"]`);
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if (existing) {
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if (existing.dataset.loaded === 'true') {
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resolve();
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} else {
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existing.addEventListener('load', resolve, {once: true});
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existing.addEventListener('error', reject, {once: true});
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}
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return;
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}
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const script = document.createElement('script');
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script.dataset.goRuntime = url.href;
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script.src = url.href;
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script.async = true;
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script.addEventListener('load', () => {
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script.dataset.loaded = 'true';
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resolve();
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}, {once: true});
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script.addEventListener('error', reject, {once: true});
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document.head.appendChild(script);
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});
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}
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function sleep(ms) {
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return new Promise((resolve) => setTimeout(resolve, ms));
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}
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async function waitForExport(name, timeoutMs = 2000) {
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const start = Date.now();
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while (typeof globalThis[name] !== 'function') {
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if (Date.now() - start > timeoutMs) {
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throw new Error(`Go runtime did not expose ${name} within ${timeoutMs}ms`);
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}
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await sleep(20);
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}
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return globalThis[name];
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}
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async function ensureWasmBridge() {
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if (!wasmBridgePromise) {
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wasmBridgePromise = (async () => {
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if (typeof globalThis.Go === 'undefined') {
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await injectScriptOnce(wasmExecUrl);
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}
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if (typeof globalThis.Go === 'undefined') {
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throw new Error('Go runtime (wasm_exec.js) is unavailable');
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}
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const go = new globalThis.Go();
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let result;
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const fetchRequest = fetch(wasmUrl);
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if (WebAssembly.instantiateStreaming) {
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try {
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result = await WebAssembly.instantiateStreaming(fetchRequest, go.importObject);
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} catch (err) {
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console.warn('instantiateStreaming failed; falling back to ArrayBuffer', err);
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const buffer = await (await fetchRequest).arrayBuffer();
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result = await WebAssembly.instantiate(buffer, go.importObject);
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}
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} else {
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const buffer = await (await fetchRequest).arrayBuffer();
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result = await WebAssembly.instantiate(buffer, go.importObject);
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}
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go.run(result.instance);
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const processFile = await waitForExport('wasmProcessFile');
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return {
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process(content) {
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const output = processFile(content);
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return typeof output === 'string' ? output : String(output ?? '');
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},
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};
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})();
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}
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return wasmBridgePromise;
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}
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async function fetchFileText(fileUrl) {
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const response = await window.fetch(fileUrl, {headers: {'Accept': 'text/plain'}});
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if (!response.ok) {
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throw new Error(`failed to fetch file (${response.status})`);
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}
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return response.text();
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}
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function ensureStyles() {
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if (styleInjected) return;
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styleInjected = true;
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const style = document.createElement('style');
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style.textContent = `
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.go-wasm-renderer {
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font-family: var(--fonts-proportional, system-ui);
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border: 1px solid var(--color-secondary);
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border-radius: 6px;
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overflow: hidden;
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}
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.go-wasm-renderer__header {
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margin: 0;
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padding: 0.75rem 1rem;
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background: var(--color-secondary-alpha-20);
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font-weight: 600;
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}
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.go-wasm-renderer pre {
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margin: 0;
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padding: 1rem;
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background: var(--color-box-body);
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font-family: var(--fonts-monospace, SFMono-Regular, monospace);
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white-space: pre;
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overflow-x: auto;
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}
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.go-wasm-renderer__error {
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color: var(--color-danger);
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}
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`;
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document.head.appendChild(style);
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}
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function renderError(container, message) {
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container.innerHTML = '';
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const wrapper = document.createElement('div');
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wrapper.className = 'go-wasm-renderer';
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const header = document.createElement('div');
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header.className = 'go-wasm-renderer__header';
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header.textContent = 'Go WASM Renderer';
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const body = document.createElement('pre');
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body.className = 'go-wasm-renderer__error';
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body.textContent = message;
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wrapper.append(header, body);
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container.appendChild(wrapper);
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}
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export default {
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name: 'Go WASM Renderer',
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async render(container, fileUrl) {
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ensureStyles();
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try {
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const [bridge, content] = await Promise.all([
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ensureWasmBridge(),
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fetchFileText(fileUrl),
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]);
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const processed = await bridge.process(content);
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const wrapper = document.createElement('div');
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wrapper.className = 'go-wasm-renderer';
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const header = document.createElement('div');
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header.className = 'go-wasm-renderer__header';
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header.textContent = 'Go WASM Renderer';
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const body = document.createElement('pre');
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body.textContent = processed;
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wrapper.append(header, body);
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container.innerHTML = '';
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container.appendChild(wrapper);
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} catch (err) {
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console.error('Go WASM plugin failed', err);
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renderError(container, `Unable to render file: ${err.message}`);
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}
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},
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};
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@ -1,29 +0,0 @@
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//go:build js && wasm
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// +build js,wasm
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package main
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import (
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"fmt"
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"strings"
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"syscall/js"
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)
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func processFile(this js.Value, args []js.Value) any {
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if len(args) == 0 {
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return js.ValueOf("(no content)")
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}
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content := args[0].String()
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lines := strings.Split(content, "\n")
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var b strings.Builder
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b.Grow(len(content) + len(lines)*8)
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for i, line := range lines {
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fmt.Fprintf(&b, "%4d │ %s\n", i+1, strings.ToUpper(line))
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}
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return js.ValueOf(b.String())
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}
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func main() {
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js.Global().Set("wasmProcessFile", js.FuncOf(processFile))
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select {}
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}
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@ -1,575 +0,0 @@
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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"use strict";
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(() => {
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const enosys = () => {
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const err = new Error("not implemented");
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err.code = "ENOSYS";
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return err;
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};
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if (!globalThis.fs) {
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let outputBuf = "";
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globalThis.fs = {
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constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1, O_DIRECTORY: -1 }, // unused
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writeSync(fd, buf) {
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outputBuf += decoder.decode(buf);
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const nl = outputBuf.lastIndexOf("\n");
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if (nl != -1) {
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console.log(outputBuf.substring(0, nl));
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outputBuf = outputBuf.substring(nl + 1);
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}
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return buf.length;
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},
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write(fd, buf, offset, length, position, callback) {
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if (offset !== 0 || length !== buf.length || position !== null) {
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callback(enosys());
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return;
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}
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const n = this.writeSync(fd, buf);
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callback(null, n);
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},
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chmod(path, mode, callback) { callback(enosys()); },
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chown(path, uid, gid, callback) { callback(enosys()); },
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close(fd, callback) { callback(enosys()); },
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fchmod(fd, mode, callback) { callback(enosys()); },
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fchown(fd, uid, gid, callback) { callback(enosys()); },
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fstat(fd, callback) { callback(enosys()); },
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fsync(fd, callback) { callback(null); },
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ftruncate(fd, length, callback) { callback(enosys()); },
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lchown(path, uid, gid, callback) { callback(enosys()); },
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link(path, link, callback) { callback(enosys()); },
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lstat(path, callback) { callback(enosys()); },
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mkdir(path, perm, callback) { callback(enosys()); },
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open(path, flags, mode, callback) { callback(enosys()); },
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read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
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readdir(path, callback) { callback(enosys()); },
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readlink(path, callback) { callback(enosys()); },
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rename(from, to, callback) { callback(enosys()); },
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rmdir(path, callback) { callback(enosys()); },
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stat(path, callback) { callback(enosys()); },
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symlink(path, link, callback) { callback(enosys()); },
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truncate(path, length, callback) { callback(enosys()); },
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unlink(path, callback) { callback(enosys()); },
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utimes(path, atime, mtime, callback) { callback(enosys()); },
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};
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}
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if (!globalThis.process) {
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globalThis.process = {
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getuid() { return -1; },
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getgid() { return -1; },
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geteuid() { return -1; },
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getegid() { return -1; },
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getgroups() { throw enosys(); },
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pid: -1,
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ppid: -1,
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umask() { throw enosys(); },
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cwd() { throw enosys(); },
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chdir() { throw enosys(); },
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}
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}
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if (!globalThis.path) {
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globalThis.path = {
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resolve(...pathSegments) {
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return pathSegments.join("/");
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}
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}
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}
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if (!globalThis.crypto) {
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throw new Error("globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)");
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}
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if (!globalThis.performance) {
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throw new Error("globalThis.performance is not available, polyfill required (performance.now only)");
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}
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if (!globalThis.TextEncoder) {
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throw new Error("globalThis.TextEncoder is not available, polyfill required");
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}
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if (!globalThis.TextDecoder) {
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throw new Error("globalThis.TextDecoder is not available, polyfill required");
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}
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const encoder = new TextEncoder("utf-8");
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const decoder = new TextDecoder("utf-8");
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globalThis.Go = class {
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constructor() {
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this.argv = ["js"];
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this.env = {};
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this.exit = (code) => {
|
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if (code !== 0) {
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console.warn("exit code:", code);
|
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}
|
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};
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this._exitPromise = new Promise((resolve) => {
|
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this._resolveExitPromise = resolve;
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});
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this._pendingEvent = null;
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this._scheduledTimeouts = new Map();
|
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this._nextCallbackTimeoutID = 1;
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|
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const setInt64 = (addr, v) => {
|
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this.mem.setUint32(addr + 0, v, true);
|
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this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
|
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}
|
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|
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const setInt32 = (addr, v) => {
|
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this.mem.setUint32(addr + 0, v, true);
|
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}
|
||||
|
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const getInt64 = (addr) => {
|
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const low = this.mem.getUint32(addr + 0, true);
|
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const high = this.mem.getInt32(addr + 4, true);
|
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return low + high * 4294967296;
|
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}
|
||||
|
||||
const loadValue = (addr) => {
|
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const f = this.mem.getFloat64(addr, true);
|
||||
if (f === 0) {
|
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return undefined;
|
||||
}
|
||||
if (!isNaN(f)) {
|
||||
return f;
|
||||
}
|
||||
|
||||
const id = this.mem.getUint32(addr, true);
|
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return this._values[id];
|
||||
}
|
||||
|
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const storeValue = (addr, v) => {
|
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const nanHead = 0x7FF80000;
|
||||
|
||||
if (typeof v === "number" && v !== 0) {
|
||||
if (isNaN(v)) {
|
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this.mem.setUint32(addr + 4, nanHead, true);
|
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this.mem.setUint32(addr, 0, true);
|
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return;
|
||||
}
|
||||
this.mem.setFloat64(addr, v, true);
|
||||
return;
|
||||
}
|
||||
|
||||
if (v === undefined) {
|
||||
this.mem.setFloat64(addr, 0, true);
|
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return;
|
||||
}
|
||||
|
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let id = this._ids.get(v);
|
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if (id === undefined) {
|
||||
id = this._idPool.pop();
|
||||
if (id === undefined) {
|
||||
id = this._values.length;
|
||||
}
|
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this._values[id] = v;
|
||||
this._goRefCounts[id] = 0;
|
||||
this._ids.set(v, id);
|
||||
}
|
||||
this._goRefCounts[id]++;
|
||||
let typeFlag = 0;
|
||||
switch (typeof v) {
|
||||
case "object":
|
||||
if (v !== null) {
|
||||
typeFlag = 1;
|
||||
}
|
||||
break;
|
||||
case "string":
|
||||
typeFlag = 2;
|
||||
break;
|
||||
case "symbol":
|
||||
typeFlag = 3;
|
||||
break;
|
||||
case "function":
|
||||
typeFlag = 4;
|
||||
break;
|
||||
}
|
||||
this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
|
||||
this.mem.setUint32(addr, id, true);
|
||||
}
|
||||
|
||||
const loadSlice = (addr) => {
|
||||
const array = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
return new Uint8Array(this._inst.exports.mem.buffer, array, len);
|
||||
}
|
||||
|
||||
const loadSliceOfValues = (addr) => {
|
||||
const array = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
const a = new Array(len);
|
||||
for (let i = 0; i < len; i++) {
|
||||
a[i] = loadValue(array + i * 8);
|
||||
}
|
||||
return a;
|
||||
}
|
||||
|
||||
const loadString = (addr) => {
|
||||
const saddr = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
|
||||
}
|
||||
|
||||
const testCallExport = (a, b) => {
|
||||
this._inst.exports.testExport0();
|
||||
return this._inst.exports.testExport(a, b);
|
||||
}
|
||||
|
||||
const timeOrigin = Date.now() - performance.now();
|
||||
this.importObject = {
|
||||
_gotest: {
|
||||
add: (a, b) => a + b,
|
||||
callExport: testCallExport,
|
||||
},
|
||||
gojs: {
|
||||
// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
|
||||
// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
|
||||
// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
|
||||
// This changes the SP, thus we have to update the SP used by the imported function.
|
||||
|
||||
// func wasmExit(code int32)
|
||||
"runtime.wasmExit": (sp) => {
|
||||
sp >>>= 0;
|
||||
const code = this.mem.getInt32(sp + 8, true);
|
||||
this.exited = true;
|
||||
delete this._inst;
|
||||
delete this._values;
|
||||
delete this._goRefCounts;
|
||||
delete this._ids;
|
||||
delete this._idPool;
|
||||
this.exit(code);
|
||||
},
|
||||
|
||||
// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
|
||||
"runtime.wasmWrite": (sp) => {
|
||||
sp >>>= 0;
|
||||
const fd = getInt64(sp + 8);
|
||||
const p = getInt64(sp + 16);
|
||||
const n = this.mem.getInt32(sp + 24, true);
|
||||
fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
|
||||
},
|
||||
|
||||
// func resetMemoryDataView()
|
||||
"runtime.resetMemoryDataView": (sp) => {
|
||||
sp >>>= 0;
|
||||
this.mem = new DataView(this._inst.exports.mem.buffer);
|
||||
},
|
||||
|
||||
// func nanotime1() int64
|
||||
"runtime.nanotime1": (sp) => {
|
||||
sp >>>= 0;
|
||||
setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
|
||||
},
|
||||
|
||||
// func walltime() (sec int64, nsec int32)
|
||||
"runtime.walltime": (sp) => {
|
||||
sp >>>= 0;
|
||||
const msec = (new Date).getTime();
|
||||
setInt64(sp + 8, msec / 1000);
|
||||
this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
|
||||
},
|
||||
|
||||
// func scheduleTimeoutEvent(delay int64) int32
|
||||
"runtime.scheduleTimeoutEvent": (sp) => {
|
||||
sp >>>= 0;
|
||||
const id = this._nextCallbackTimeoutID;
|
||||
this._nextCallbackTimeoutID++;
|
||||
this._scheduledTimeouts.set(id, setTimeout(
|
||||
() => {
|
||||
this._resume();
|
||||
while (this._scheduledTimeouts.has(id)) {
|
||||
// for some reason Go failed to register the timeout event, log and try again
|
||||
// (temporary workaround for https://github.com/golang/go/issues/28975)
|
||||
console.warn("scheduleTimeoutEvent: missed timeout event");
|
||||
this._resume();
|
||||
}
|
||||
},
|
||||
getInt64(sp + 8),
|
||||
));
|
||||
this.mem.setInt32(sp + 16, id, true);
|
||||
},
|
||||
|
||||
// func clearTimeoutEvent(id int32)
|
||||
"runtime.clearTimeoutEvent": (sp) => {
|
||||
sp >>>= 0;
|
||||
const id = this.mem.getInt32(sp + 8, true);
|
||||
clearTimeout(this._scheduledTimeouts.get(id));
|
||||
this._scheduledTimeouts.delete(id);
|
||||
},
|
||||
|
||||
// func getRandomData(r []byte)
|
||||
"runtime.getRandomData": (sp) => {
|
||||
sp >>>= 0;
|
||||
crypto.getRandomValues(loadSlice(sp + 8));
|
||||
},
|
||||
|
||||
// func finalizeRef(v ref)
|
||||
"syscall/js.finalizeRef": (sp) => {
|
||||
sp >>>= 0;
|
||||
const id = this.mem.getUint32(sp + 8, true);
|
||||
this._goRefCounts[id]--;
|
||||
if (this._goRefCounts[id] === 0) {
|
||||
const v = this._values[id];
|
||||
this._values[id] = null;
|
||||
this._ids.delete(v);
|
||||
this._idPool.push(id);
|
||||
}
|
||||
},
|
||||
|
||||
// func stringVal(value string) ref
|
||||
"syscall/js.stringVal": (sp) => {
|
||||
sp >>>= 0;
|
||||
storeValue(sp + 24, loadString(sp + 8));
|
||||
},
|
||||
|
||||
// func valueGet(v ref, p string) ref
|
||||
"syscall/js.valueGet": (sp) => {
|
||||
sp >>>= 0;
|
||||
const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 32, result);
|
||||
},
|
||||
|
||||
// func valueSet(v ref, p string, x ref)
|
||||
"syscall/js.valueSet": (sp) => {
|
||||
sp >>>= 0;
|
||||
Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
|
||||
},
|
||||
|
||||
// func valueDelete(v ref, p string)
|
||||
"syscall/js.valueDelete": (sp) => {
|
||||
sp >>>= 0;
|
||||
Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
|
||||
},
|
||||
|
||||
// func valueIndex(v ref, i int) ref
|
||||
"syscall/js.valueIndex": (sp) => {
|
||||
sp >>>= 0;
|
||||
storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
|
||||
},
|
||||
|
||||
// valueSetIndex(v ref, i int, x ref)
|
||||
"syscall/js.valueSetIndex": (sp) => {
|
||||
sp >>>= 0;
|
||||
Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
|
||||
},
|
||||
|
||||
// func valueCall(v ref, m string, args []ref) (ref, bool)
|
||||
"syscall/js.valueCall": (sp) => {
|
||||
sp >>>= 0;
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const m = Reflect.get(v, loadString(sp + 16));
|
||||
const args = loadSliceOfValues(sp + 32);
|
||||
const result = Reflect.apply(m, v, args);
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 56, result);
|
||||
this.mem.setUint8(sp + 64, 1);
|
||||
} catch (err) {
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 56, err);
|
||||
this.mem.setUint8(sp + 64, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueInvoke(v ref, args []ref) (ref, bool)
|
||||
"syscall/js.valueInvoke": (sp) => {
|
||||
sp >>>= 0;
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const args = loadSliceOfValues(sp + 16);
|
||||
const result = Reflect.apply(v, undefined, args);
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 40, result);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
} catch (err) {
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 40, err);
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueNew(v ref, args []ref) (ref, bool)
|
||||
"syscall/js.valueNew": (sp) => {
|
||||
sp >>>= 0;
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const args = loadSliceOfValues(sp + 16);
|
||||
const result = Reflect.construct(v, args);
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 40, result);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
} catch (err) {
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 40, err);
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueLength(v ref) int
|
||||
"syscall/js.valueLength": (sp) => {
|
||||
sp >>>= 0;
|
||||
setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
|
||||
},
|
||||
|
||||
// valuePrepareString(v ref) (ref, int)
|
||||
"syscall/js.valuePrepareString": (sp) => {
|
||||
sp >>>= 0;
|
||||
const str = encoder.encode(String(loadValue(sp + 8)));
|
||||
storeValue(sp + 16, str);
|
||||
setInt64(sp + 24, str.length);
|
||||
},
|
||||
|
||||
// valueLoadString(v ref, b []byte)
|
||||
"syscall/js.valueLoadString": (sp) => {
|
||||
sp >>>= 0;
|
||||
const str = loadValue(sp + 8);
|
||||
loadSlice(sp + 16).set(str);
|
||||
},
|
||||
|
||||
// func valueInstanceOf(v ref, t ref) bool
|
||||
"syscall/js.valueInstanceOf": (sp) => {
|
||||
sp >>>= 0;
|
||||
this.mem.setUint8(sp + 24, (loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0);
|
||||
},
|
||||
|
||||
// func copyBytesToGo(dst []byte, src ref) (int, bool)
|
||||
"syscall/js.copyBytesToGo": (sp) => {
|
||||
sp >>>= 0;
|
||||
const dst = loadSlice(sp + 8);
|
||||
const src = loadValue(sp + 32);
|
||||
if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
return;
|
||||
}
|
||||
const toCopy = src.subarray(0, dst.length);
|
||||
dst.set(toCopy);
|
||||
setInt64(sp + 40, toCopy.length);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
},
|
||||
|
||||
// func copyBytesToJS(dst ref, src []byte) (int, bool)
|
||||
"syscall/js.copyBytesToJS": (sp) => {
|
||||
sp >>>= 0;
|
||||
const dst = loadValue(sp + 8);
|
||||
const src = loadSlice(sp + 16);
|
||||
if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
return;
|
||||
}
|
||||
const toCopy = src.subarray(0, dst.length);
|
||||
dst.set(toCopy);
|
||||
setInt64(sp + 40, toCopy.length);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
},
|
||||
|
||||
"debug": (value) => {
|
||||
console.log(value);
|
||||
},
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
async run(instance) {
|
||||
if (!(instance instanceof WebAssembly.Instance)) {
|
||||
throw new Error("Go.run: WebAssembly.Instance expected");
|
||||
}
|
||||
this._inst = instance;
|
||||
this.mem = new DataView(this._inst.exports.mem.buffer);
|
||||
this._values = [ // JS values that Go currently has references to, indexed by reference id
|
||||
NaN,
|
||||
0,
|
||||
null,
|
||||
true,
|
||||
false,
|
||||
globalThis,
|
||||
this,
|
||||
];
|
||||
this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
|
||||
this._ids = new Map([ // mapping from JS values to reference ids
|
||||
[0, 1],
|
||||
[null, 2],
|
||||
[true, 3],
|
||||
[false, 4],
|
||||
[globalThis, 5],
|
||||
[this, 6],
|
||||
]);
|
||||
this._idPool = []; // unused ids that have been garbage collected
|
||||
this.exited = false; // whether the Go program has exited
|
||||
|
||||
// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
|
||||
let offset = 4096;
|
||||
|
||||
const strPtr = (str) => {
|
||||
const ptr = offset;
|
||||
const bytes = encoder.encode(str + "\0");
|
||||
new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
|
||||
offset += bytes.length;
|
||||
if (offset % 8 !== 0) {
|
||||
offset += 8 - (offset % 8);
|
||||
}
|
||||
return ptr;
|
||||
};
|
||||
|
||||
const argc = this.argv.length;
|
||||
|
||||
const argvPtrs = [];
|
||||
this.argv.forEach((arg) => {
|
||||
argvPtrs.push(strPtr(arg));
|
||||
});
|
||||
argvPtrs.push(0);
|
||||
|
||||
const keys = Object.keys(this.env).sort();
|
||||
keys.forEach((key) => {
|
||||
argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
|
||||
});
|
||||
argvPtrs.push(0);
|
||||
|
||||
const argv = offset;
|
||||
argvPtrs.forEach((ptr) => {
|
||||
this.mem.setUint32(offset, ptr, true);
|
||||
this.mem.setUint32(offset + 4, 0, true);
|
||||
offset += 8;
|
||||
});
|
||||
|
||||
// The linker guarantees global data starts from at least wasmMinDataAddr.
|
||||
// Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr.
|
||||
const wasmMinDataAddr = 4096 + 8192;
|
||||
if (offset >= wasmMinDataAddr) {
|
||||
throw new Error("total length of command line and environment variables exceeds limit");
|
||||
}
|
||||
|
||||
this._inst.exports.run(argc, argv);
|
||||
if (this.exited) {
|
||||
this._resolveExitPromise();
|
||||
}
|
||||
await this._exitPromise;
|
||||
}
|
||||
|
||||
_resume() {
|
||||
if (this.exited) {
|
||||
throw new Error("Go program has already exited");
|
||||
}
|
||||
this._inst.exports.resume();
|
||||
if (this.exited) {
|
||||
this._resolveExitPromise();
|
||||
}
|
||||
}
|
||||
|
||||
_makeFuncWrapper(id) {
|
||||
const go = this;
|
||||
return function () {
|
||||
const event = { id: id, this: this, args: arguments };
|
||||
go._pendingEvent = event;
|
||||
go._resume();
|
||||
return event.result;
|
||||
};
|
||||
}
|
||||
}
|
||||
})();
|
||||
Loading…
x
Reference in New Issue
Block a user