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ff932b411d
Currently all async ops are polled lazily, which means that op initialization code is postponed until control is yielded to the event loop. This has some weird consequences, e.g. ```js let listener = Deno.listen(...); let conn_promise = listener.accept(); listener.close(); // `BadResource` is thrown. A reasonable error would be `Interrupted`. let conn = await conn_promise; ``` JavaScript promises are expected to be eagerly evaluated. This patch makes ops actually do that.
346 lines
9.6 KiB
JavaScript
346 lines
9.6 KiB
JavaScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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// @ts-check
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/// <reference path="../../core/lib.deno_core.d.ts" />
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/// <reference path="../webidl/internal.d.ts" />
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/// <reference path="./internal.d.ts" />
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/// <reference path="./lib.deno_web.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 { Interrupted } = core;
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const webidl = window.__bootstrap.webidl;
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const { setEventTargetData } = window.__bootstrap.eventTarget;
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const { defineEventHandler } = window.__bootstrap.event;
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const { DOMException } = window.__bootstrap.domException;
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const {
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ArrayBuffer,
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ArrayPrototypeFilter,
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ArrayPrototypeIncludes,
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ArrayPrototypePush,
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ObjectSetPrototypeOf,
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Symbol,
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SymbolFor,
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TypeError,
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WeakSet,
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WeakSetPrototypeAdd,
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WeakSetPrototypeHas,
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} = window.__bootstrap.primordials;
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class MessageChannel {
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/** @type {MessagePort} */
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#port1;
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/** @type {MessagePort} */
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#port2;
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constructor() {
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this[webidl.brand] = webidl.brand;
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const [port1Id, port2Id] = opCreateEntangledMessagePort();
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const port1 = createMessagePort(port1Id);
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const port2 = createMessagePort(port2Id);
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this.#port1 = port1;
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this.#port2 = port2;
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}
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get port1() {
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webidl.assertBranded(this, MessageChannel);
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return this.#port1;
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}
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get port2() {
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webidl.assertBranded(this, MessageChannel);
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return this.#port2;
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}
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[SymbolFor("Deno.inspect")](inspect) {
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return `MessageChannel ${
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inspect({ port1: this.port1, port2: this.port2 })
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}`;
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}
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}
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webidl.configurePrototype(MessageChannel);
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const _id = Symbol("id");
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const _enabled = Symbol("enabled");
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/**
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* @param {number} id
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* @returns {MessagePort}
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*/
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function createMessagePort(id) {
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const port = core.createHostObject();
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ObjectSetPrototypeOf(port, MessagePort.prototype);
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port[webidl.brand] = webidl.brand;
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setEventTargetData(port);
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port[_id] = id;
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return port;
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}
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class MessagePort extends EventTarget {
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/** @type {number | null} */
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[_id] = null;
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/** @type {boolean} */
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[_enabled] = false;
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constructor() {
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super();
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webidl.illegalConstructor();
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}
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/**
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* @param {any} message
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* @param {object[] | StructuredSerializeOptions} transferOrOptions
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*/
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postMessage(message, transferOrOptions = {}) {
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webidl.assertBranded(this, MessagePort);
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const prefix = "Failed to execute 'postMessage' on 'MessagePort'";
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webidl.requiredArguments(arguments.length, 1, { prefix });
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message = webidl.converters.any(message);
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let options;
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if (
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webidl.type(transferOrOptions) === "Object" &&
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transferOrOptions !== undefined &&
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transferOrOptions[Symbol.iterator] !== undefined
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) {
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const transfer = webidl.converters["sequence<object>"](
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transferOrOptions,
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{ prefix, context: "Argument 2" },
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);
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options = { transfer };
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} else {
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options = webidl.converters.StructuredSerializeOptions(
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transferOrOptions,
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{
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prefix,
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context: "Argument 2",
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},
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);
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}
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const { transfer } = options;
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if (ArrayPrototypeIncludes(transfer, this)) {
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throw new DOMException("Can not tranfer self", "DataCloneError");
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}
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const data = serializeJsMessageData(message, transfer);
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if (this[_id] === null) return;
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core.opSync("op_message_port_post_message", this[_id], data);
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}
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start() {
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webidl.assertBranded(this, MessagePort);
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if (this[_enabled]) return;
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(async () => {
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this[_enabled] = true;
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while (true) {
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if (this[_id] === null) break;
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let data;
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try {
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data = await core.opAsync(
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"op_message_port_recv_message",
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this[_id],
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);
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} catch (err) {
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if (err instanceof Interrupted) break;
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throw err;
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}
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if (data === null) break;
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let message, transferables;
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try {
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const v = deserializeJsMessageData(data);
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message = v[0];
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transferables = v[1];
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} catch (err) {
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const event = new MessageEvent("messageerror", { data: err });
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this.dispatchEvent(event);
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return;
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}
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const event = new MessageEvent("message", {
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data: message,
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ports: ArrayPrototypeFilter(
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transferables,
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(t) => t instanceof MessagePort,
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),
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});
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this.dispatchEvent(event);
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}
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this[_enabled] = false;
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})();
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}
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close() {
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webidl.assertBranded(this, MessagePort);
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if (this[_id] !== null) {
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core.close(this[_id]);
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this[_id] = null;
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}
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}
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}
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defineEventHandler(MessagePort.prototype, "message", function (self) {
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self.start();
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});
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defineEventHandler(MessagePort.prototype, "messageerror");
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webidl.configurePrototype(MessagePort);
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/**
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* @returns {[number, number]}
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*/
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function opCreateEntangledMessagePort() {
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return core.opSync("op_message_port_create_entangled");
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}
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/**
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* @param {globalThis.__bootstrap.messagePort.MessageData} messageData
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* @returns {[any, object[]]}
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*/
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function deserializeJsMessageData(messageData) {
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/** @type {object[]} */
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const transferables = [];
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const hostObjects = [];
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const arrayBufferIdsInTransferables = [];
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const transferedArrayBuffers = [];
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for (const transferable of messageData.transferables) {
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switch (transferable.kind) {
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case "messagePort": {
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const port = createMessagePort(transferable.data);
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ArrayPrototypePush(transferables, port);
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ArrayPrototypePush(hostObjects, port);
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break;
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}
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case "arrayBuffer": {
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ArrayPrototypePush(transferedArrayBuffers, transferable.data);
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const i = ArrayPrototypePush(transferables, null);
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ArrayPrototypePush(arrayBufferIdsInTransferables, i);
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break;
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}
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default:
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throw new TypeError("Unreachable");
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}
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}
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const data = core.deserialize(messageData.data, {
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hostObjects,
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transferedArrayBuffers,
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});
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for (const i in arrayBufferIdsInTransferables) {
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const id = arrayBufferIdsInTransferables[i];
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transferables[id] = transferedArrayBuffers[i];
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}
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return [data, transferables];
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}
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const detachedArrayBuffers = new WeakSet();
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/**
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* @param {any} data
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* @param {object[]} transferables
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* @returns {globalThis.__bootstrap.messagePort.MessageData}
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*/
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function serializeJsMessageData(data, transferables) {
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const transferedArrayBuffers = ArrayPrototypeFilter(
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transferables,
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(a) => a instanceof ArrayBuffer,
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);
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for (const arrayBuffer of transferedArrayBuffers) {
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// This is hacky with both false positives and false negatives for
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// detecting detached array buffers. V8 needs to add a way to tell if a
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// buffer is detached or not.
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if (WeakSetPrototypeHas(detachedArrayBuffers, arrayBuffer)) {
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throw new DOMException(
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"Can not transfer detached ArrayBuffer",
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"DataCloneError",
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);
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}
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WeakSetPrototypeAdd(detachedArrayBuffers, arrayBuffer);
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}
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let serializedData;
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try {
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serializedData = core.serialize(data, {
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hostObjects: ArrayPrototypeFilter(
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transferables,
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(a) => a instanceof MessagePort,
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),
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transferedArrayBuffers,
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});
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} catch (err) {
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throw new DOMException(err.message, "DataCloneError");
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}
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/** @type {globalThis.__bootstrap.messagePort.Transferable[]} */
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const serializedTransferables = [];
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let arrayBufferI = 0;
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for (const transferable of transferables) {
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if (transferable instanceof MessagePort) {
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webidl.assertBranded(transferable, MessagePort);
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const id = transferable[_id];
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if (id === null) {
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throw new DOMException(
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"Can not transfer disentangled message port",
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"DataCloneError",
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);
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}
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transferable[_id] = null;
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ArrayPrototypePush(serializedTransferables, {
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kind: "messagePort",
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data: id,
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});
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} else if (transferable instanceof ArrayBuffer) {
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ArrayPrototypePush(serializedTransferables, {
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kind: "arrayBuffer",
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data: transferedArrayBuffers[arrayBufferI],
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});
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arrayBufferI++;
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} else {
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throw new DOMException("Value not transferable", "DataCloneError");
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}
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}
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return {
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data: serializedData,
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transferables: serializedTransferables,
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};
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}
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webidl.converters.StructuredSerializeOptions = webidl
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.createDictionaryConverter(
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"StructuredSerializeOptions",
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[
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{
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key: "transfer",
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converter: webidl.converters["sequence<object>"],
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get defaultValue() {
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return [];
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},
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},
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],
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);
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function structuredClone(value, options) {
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const prefix = "Failed to execute 'structuredClone'";
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webidl.requiredArguments(arguments.length, 1, { prefix });
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options = webidl.converters.StructuredSerializeOptions(options, {
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prefix,
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context: "Argument 2",
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});
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const messageData = serializeJsMessageData(value, options.transfer);
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const [data] = deserializeJsMessageData(messageData);
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return data;
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}
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window.__bootstrap.messagePort = {
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MessageChannel,
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MessagePort,
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deserializeJsMessageData,
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serializeJsMessageData,
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structuredClone,
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};
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})(globalThis);
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