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https://github.com/denoland/deno.git
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186 lines
5.3 KiB
JavaScript
186 lines
5.3 KiB
JavaScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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/// <reference path="../../core/internal.d.ts" />
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"use strict";
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((window) => {
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const core = window.Deno.core;
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const webidl = window.__bootstrap.webidl;
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const { setTarget } = window.__bootstrap.event;
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const { DOMException } = window.__bootstrap.domException;
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const {
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ArrayPrototypeIndexOf,
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ArrayPrototypeSplice,
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ArrayPrototypePush,
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Symbol,
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Uint8Array,
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ObjectDefineProperty,
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Map,
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MapPrototypeSet,
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MapPrototypeGet,
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FunctionPrototypeCall,
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} = window.__bootstrap.primordials;
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const handlerSymbol = Symbol("eventHandlers");
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function makeWrappedHandler(handler) {
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function wrappedHandler(...args) {
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if (typeof wrappedHandler.handler !== "function") {
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return;
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}
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return FunctionPrototypeCall(wrappedHandler.handler, this, ...args);
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}
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wrappedHandler.handler = handler;
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return wrappedHandler;
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}
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// TODO(lucacasonato) reuse when we can reuse code between web crates
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function defineEventHandler(emitter, name) {
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// HTML specification section 8.1.5.1
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ObjectDefineProperty(emitter, `on${name}`, {
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get() {
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// TODO(bnoordhuis) The "BroadcastChannel should have an onmessage
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// event" WPT test expects that .onmessage !== undefined. Returning
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// null makes it pass but is perhaps not exactly in the spirit.
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if (!this[handlerSymbol]) {
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return null;
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}
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return MapPrototypeGet(this[handlerSymbol], name)?.handler ?? null;
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},
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set(value) {
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if (!this[handlerSymbol]) {
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this[handlerSymbol] = new Map();
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}
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let handlerWrapper = MapPrototypeGet(this[handlerSymbol], name);
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if (handlerWrapper) {
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handlerWrapper.handler = value;
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} else {
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handlerWrapper = makeWrappedHandler(value);
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this.addEventListener(name, handlerWrapper);
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}
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MapPrototypeSet(this[handlerSymbol], name, handlerWrapper);
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},
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configurable: true,
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enumerable: true,
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});
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}
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const _name = Symbol("[[name]]");
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const _closed = Symbol("[[closed]]");
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const channels = [];
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let rid = null;
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async function recv() {
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while (channels.length > 0) {
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const message = await core.opAsync("op_broadcast_recv", rid);
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if (message === null) {
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break;
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}
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const [name, data] = message;
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dispatch(null, name, new Uint8Array(data));
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}
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core.close(rid);
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rid = null;
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}
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function dispatch(source, name, data) {
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for (const channel of channels) {
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if (channel === source) continue; // Don't self-send.
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if (channel[_name] !== name) continue;
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if (channel[_closed]) continue;
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const go = () => {
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if (channel[_closed]) return;
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const event = new MessageEvent("message", {
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data: core.deserialize(data), // TODO(bnoordhuis) Cache immutables.
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origin: "http://127.0.0.1",
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});
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setTarget(event, channel);
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channel.dispatchEvent(event);
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};
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defer(go);
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}
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}
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// Defer to avoid starving the event loop. Not using queueMicrotask()
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// for that reason: it lets promises make forward progress but can
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// still starve other parts of the event loop.
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function defer(go) {
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setTimeout(go, 1);
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}
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class BroadcastChannel extends EventTarget {
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[_name];
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[_closed] = false;
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get name() {
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return this[_name];
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}
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constructor(name) {
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super();
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const prefix = "Failed to construct 'BroadcastChannel'";
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webidl.requiredArguments(arguments.length, 1, { prefix });
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this[_name] = webidl.converters["DOMString"](name, {
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prefix,
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context: "Argument 1",
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});
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this[webidl.brand] = webidl.brand;
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ArrayPrototypePush(channels, this);
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if (rid === null) {
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// Create the rid immediately, otherwise there is a time window (and a
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// race condition) where messages can get lost, because recv() is async.
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rid = core.opSync("op_broadcast_subscribe");
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recv();
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}
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}
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postMessage(message) {
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webidl.assertBranded(this, BroadcastChannel);
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const prefix = "Failed to execute 'postMessage' on 'BroadcastChannel'";
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webidl.requiredArguments(arguments.length, 1, { prefix });
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if (this[_closed]) {
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throw new DOMException("Already closed", "InvalidStateError");
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}
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if (typeof message === "function" || typeof message === "symbol") {
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throw new DOMException("Uncloneable value", "DataCloneError");
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}
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const data = core.serialize(message);
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// Send to other listeners in this VM.
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dispatch(this, this[_name], new Uint8Array(data));
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// Send to listeners in other VMs.
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defer(() => core.opAsync("op_broadcast_send", [rid, this[_name]], data));
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}
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close() {
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webidl.assertBranded(this, BroadcastChannel);
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this[_closed] = true;
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const index = ArrayPrototypeIndexOf(channels, this);
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if (index === -1) return;
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ArrayPrototypeSplice(channels, index, 1);
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if (channels.length === 0) core.opSync("op_broadcast_unsubscribe", rid);
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}
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}
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defineEventHandler(BroadcastChannel.prototype, "message");
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defineEventHandler(BroadcastChannel.prototype, "messageerror");
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window.__bootstrap.broadcastChannel = { BroadcastChannel };
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})(this);
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