134 lines
3.8 KiB
TypeScript
134 lines
3.8 KiB
TypeScript
/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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import { NewWorkerMessage, TerminateWorkerMessage, WorkerMessageType } from 'vs/workbench/services/extensions/common/polyfillNestedWorker.protocol';
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declare function postMessage(data: any, transferables?: Transferable[]): void;
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declare type MessageEventHandler = ((ev: MessageEvent<any>) => any) | null;
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const _bootstrapFnSource = (function _bootstrapFn(workerUrl: string) {
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const listener: EventListener = (event: Event): void => {
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// uninstall handler
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self.removeEventListener('message', listener);
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// get data
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const port = <MessagePort>(<MessageEvent>event).data;
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// postMessage
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// onmessage
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Object.defineProperties(self, {
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'postMessage': {
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value(data: any, transferOrOptions?: any) {
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port.postMessage(data, transferOrOptions);
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}
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},
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'onmessage': {
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get() {
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return port.onmessage;
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},
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set(value: MessageEventHandler) {
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port.onmessage = value;
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}
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}
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// todo onerror
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});
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port.addEventListener('message', msg => {
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self.dispatchEvent(new MessageEvent('message', { data: msg.data }));
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});
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port.start();
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// fake recursively nested worker
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self.Worker = <any>class { constructor() { throw new TypeError('Nested workers from within nested worker are NOT supported.'); } };
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// load module
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importScripts(workerUrl);
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};
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self.addEventListener('message', listener);
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}).toString();
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export class NestedWorker extends EventTarget implements Worker {
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onmessage: ((this: Worker, ev: MessageEvent<any>) => any) | null = null;
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onmessageerror: ((this: Worker, ev: MessageEvent<any>) => any) | null = null;
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onerror: ((this: AbstractWorker, ev: ErrorEvent) => any) | null = null;
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readonly terminate: () => void;
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readonly postMessage: (message: any, options?: any) => void;
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constructor(nativePostMessage: typeof postMessage, stringOrUrl: string | URL, options?: WorkerOptions) {
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super();
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// create bootstrap script
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const bootstrap = `((${_bootstrapFnSource})('${stringOrUrl}'))`;
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const blob = new Blob([bootstrap], { type: 'application/javascript' });
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const blobUrl = URL.createObjectURL(blob);
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const channel = new MessageChannel();
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const id = blobUrl; // works because blob url is unique, needs ID pool otherwise
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const msg: NewWorkerMessage = {
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type: WorkerMessageType.NewWorker,
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id,
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port: channel.port2,
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url: blobUrl,
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options,
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};
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nativePostMessage(msg, [channel.port2]);
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// worker-impl: functions
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this.postMessage = channel.port1.postMessage.bind(channel.port1);
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this.terminate = () => {
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const msg: TerminateWorkerMessage = {
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type: WorkerMessageType.TerminateWorker,
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id
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};
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channel.port1.postMessage(msg);
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URL.revokeObjectURL(blobUrl);
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channel.port1.close();
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channel.port2.close();
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};
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// worker-impl: events
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Object.defineProperties(this, {
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'onmessage': {
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get() {
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return channel.port1.onmessage;
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},
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set(value: MessageEventHandler) {
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channel.port1.onmessage = value;
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}
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},
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'onmessageerror': {
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get() {
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return channel.port1.onmessageerror;
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},
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set(value: MessageEventHandler) {
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channel.port1.onmessageerror = value;
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}
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},
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// todo onerror
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});
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channel.port1.addEventListener('messageerror', evt => {
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const msgEvent = new MessageEvent('messageerror', { data: evt.data });
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this.dispatchEvent(msgEvent);
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});
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channel.port1.addEventListener('message', evt => {
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const msgEvent = new MessageEvent('message', { data: evt.data });
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this.dispatchEvent(msgEvent);
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});
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channel.port1.start();
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}
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}
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