86 lines
2.9 KiB
JavaScript
86 lines
2.9 KiB
JavaScript
const fs = require("fs/promises");
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const util = require("util");
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const execFile = util.promisify(require("child_process").execFile);
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const path = require("path");
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const { lookpath } = require("lookpath");
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module.exports = function (source) {
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const cb = this.async();
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const goBin = lookpath("go");
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if (!goBin) {
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return cb(new Error("go bin not found in path."));
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}
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if (!process.env.GOROOT) {
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return cb(new Error("Could not find GOROOT in environment.\n" +
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"Please try adding this to your script:\n" +
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"GOROOT=`go env GOROOT` npm run ..."));
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}
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const parent = path.dirname(this.resourcePath);
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const outFile = this.resourcePath.slice(0, -2) + "wasm";
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let modDir = parent;
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const opts = {
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cwd: parent,
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env: {
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GOPATH: process.env.GOPATH || path.join(process.env.HOME, "go"),
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GOROOT: process.env.GOROOT,
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GOCACHE: path.join(__dirname, ".gocache"),
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GOOS: "js",
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GOARCH: "wasm",
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},
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};
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(async () => {
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let found = false;
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const root = path.resolve(path.sep);
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while (path.resolve(modDir) != root) {
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found = await fs.access(path.join(modDir, 'go.mod')).then(() => true).catch(() => false);
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if (found) {
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break;
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}
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modDir = path.join(modDir, "..");
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}
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if (!found) {
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return cb(new Error("Could not find go.mod in any parent directory of " + this.resourcePath));
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}
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const wasmOrigPath = path.join(process.env.GOROOT, "misc", "wasm", "wasm_exec.js");
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const wasmSavePath = path.join(__dirname, 'wasm_exec.js');
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const errorPaths = ["\t" + wasmOrigPath, "\t" + wasmSavePath];
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if (!(await fs.access(wasmOrigPath).then(() => true).catch(() => false)) &&
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!(await fs.access(wasmSavePath).then(() => true).catch(() => false))) {
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return cb(new Error("Could not find wasm_exec.js file. Invalid GOROOT? Searched paths:\n" +
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errorPaths.join(",\n") + "\n"));
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}
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const res = await execFile("go", ["build", "-o", outFile, parent], opts)
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.then(() => true)
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.catch(e => e);
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if (res instanceof Error) {
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return cb(e);
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}
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found = await fs.access(wasmSavePath).then(() => true).catch(() => false);
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if (!found) fs.copyFile(wasmOrigPath, wasmSavePath);
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const contents = await fs.readFile(outFile);
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fs.unlink(outFile);
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const emitPath = path.basename(outFile);
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this.emitFile(emitPath, contents);
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this.addContextDependency(modDir);
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cb(null,
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`require('!${wasmSavePath}');
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import goWasm from '${path.join(__dirname, 'bridge.js')}';
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const wasm = fetch('${emitPath}').then(response => response.arrayBuffer());
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export default goWasm(wasm);`);
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})();
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}
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