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b9b6e57581
* WIP: wasm-bindgen-rayon and new OMT plugin * Bump package-lock * Make OMT work again * Update year * Restore accidental change * Prevent minification of `nextDefineUri` * Delay loading external deps This gives inline `define` calls a chance to define dependencies for earlier `define` calls on the same page. * Add comment
99 lines
3.9 KiB
JavaScript
Generated
99 lines
3.9 KiB
JavaScript
Generated
/**
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* Copyright 2021 Google Inc. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Note: we use `wasm_bindgen_worker_`-prefixed message types to make sure
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// we can handle bundling into other files, which might happen to have their
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// own `postMessage`/`onmessage` communication channels.
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//
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// If we didn't take that into the account, we could send much simpler signals
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// like just `0` or whatever, but the code would be less resilient.
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function waitForMsgType(target, type) {
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return new Promise(resolve => {
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target.addEventListener('message', function onMsg({ data }) {
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if (data == null || data.type !== type) return;
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target.removeEventListener('message', onMsg);
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resolve(data);
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});
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});
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}
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waitForMsgType(self, 'wasm_bindgen_worker_init').then(async data => {
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// # Note 1
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// Our JS should have been generated in
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// `[out-dir]/snippets/wasm-bindgen-rayon-[hash]/workerHelpers.js`,
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// resolve the main module via `../../..`.
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//
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// This might need updating if the generated structure changes on wasm-bindgen
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// side ever in the future, but works well with bundlers today. The whole
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// point of this crate, after all, is to abstract away unstable features
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// and temporary bugs so that you don't need to deal with them in your code.
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//
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// # Note 2
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// This could be a regular import, but then some bundlers complain about
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// circular deps.
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//
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// Dynamic import could be cheap if this file was inlined into the parent,
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// which would require us just using `../../..` in `new Worker` below,
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// but that doesn't work because wasm-pack unconditionally adds
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// "sideEffects":false (see below).
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//
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// OTOH, even though it can't be inlined, it should be still reasonably
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// cheap since the requested file is already in cache (it was loaded by
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// the main thread).
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const pkg = await import('../../..');
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await pkg.default(data.module, data.memory);
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postMessage({ type: 'wasm_bindgen_worker_ready' });
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pkg.wbg_rayon_start_worker(data.receiver);
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});
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export async function startWorkers(module, memory, builder) {
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const workerInit = {
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type: 'wasm_bindgen_worker_init',
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module,
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memory,
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receiver: builder.receiver()
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};
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try {
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await Promise.all(
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Array.from({ length: builder.numThreads() }, () => {
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// Self-spawn into a new Worker.
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//
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// TODO: while `new URL('...', import.meta.url) becomes a semi-standard
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// way to get asset URLs relative to the module across various bundlers
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// and browser, ideally we should switch to `import.meta.resolve`
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// once it becomes a standard.
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//
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// Note: we could use `../../..` as the URL here to inline workerHelpers.js
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// into the parent entry instead of creating another split point -
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// this would be preferable from optimization perspective -
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// however, Webpack then eliminates all message handler code
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// because wasm-pack produces "sideEffects":false in package.json
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// unconditionally.
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//
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// The only way to work around that is to have side effect code
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// in an entry point such as Worker file itself.
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const worker = new Worker(new URL('./workerHelpers.js', import.meta.url), {
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type: 'module'
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});
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worker.postMessage(workerInit);
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return waitForMsgType(worker, 'wasm_bindgen_worker_ready');
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})
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);
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builder.build();
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} finally {
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builder.free();
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}
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}
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