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Instead of passing the payload for Workers directly to `.onmessage`, perform something more similar to what the browser API provides, namely create an event object with a `.data` property. This does not make `MessagePort` implement the `EventTarget` API, nor does it implement the full `MessageEvent` API, but it would make such extensions non-breaking changes if we desire them at some point in the future. (This would be a breaking change if Workers were not experimental. Currently, this method is also undocumented and only exists with the idea of enabling some degree of Web compatibility.) PR-URL: https://github.com/nodejs/node/pull/26082 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Denys Otrishko <shishugi@gmail.com>
81 lines
2.0 KiB
JavaScript
81 lines
2.0 KiB
JavaScript
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const { MessageChannel, MessagePort } = require('worker_threads');
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{
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const { port1, port2 } = new MessageChannel();
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assert(port1 instanceof MessagePort);
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assert(port2 instanceof MessagePort);
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const input = { a: 1 };
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port1.postMessage(input);
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port2.on('message', common.mustCall((received) => {
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assert.deepStrictEqual(received, input);
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port2.close(common.mustCall());
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}));
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}
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{
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const { port1, port2 } = new MessageChannel();
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port1.onmessage = common.mustCall((message) => {
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assert.strictEqual(message.data, 4);
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assert.strictEqual(message.target, port1);
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port2.close(common.mustCall());
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});
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port1.postMessage(2);
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port2.onmessage = common.mustCall((message) => {
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port2.postMessage(message.data * 2);
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});
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}
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{
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const { port1, port2 } = new MessageChannel();
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const input = { a: 1 };
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port1.postMessage(input);
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// Check that the message still gets delivered if `port2` has its
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// `on('message')` handler attached at a later point in time.
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setImmediate(() => {
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port2.on('message', common.mustCall((received) => {
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assert.deepStrictEqual(received, input);
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port2.close(common.mustCall());
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}));
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});
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}
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{
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const { port1, port2 } = new MessageChannel();
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const input = { a: 1 };
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const dummy = common.mustNotCall();
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// Check that the message still gets delivered if `port2` has its
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// `on('message')` handler attached at a later point in time, even if a
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// listener was removed previously.
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port2.addListener('message', dummy);
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setImmediate(() => {
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port2.removeListener('message', dummy);
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port1.postMessage(input);
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setImmediate(() => {
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port2.on('message', common.mustCall((received) => {
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assert.deepStrictEqual(received, input);
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port2.close(common.mustCall());
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}));
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});
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});
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}
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{
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assert.deepStrictEqual(
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Object.getOwnPropertyNames(MessagePort.prototype).sort(),
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[
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'close', 'constructor', 'onmessage', 'postMessage', 'ref', 'start',
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'unref'
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]);
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}
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