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https://github.com/denoland/deno.git
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409 lines
10 KiB
JavaScript
409 lines
10 KiB
JavaScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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"use strict";
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((window) => {
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const core = window.Deno.core;
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// provided by "deno_web"
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const { URL } = window.__bootstrap.url;
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const CONNECTING = 0;
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const OPEN = 1;
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const CLOSING = 2;
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const CLOSED = 3;
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function requiredArguments(
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name,
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length,
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required,
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) {
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if (length < required) {
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const errMsg = `${name} requires at least ${required} argument${
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required === 1 ? "" : "s"
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}, but only ${length} present`;
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throw new TypeError(errMsg);
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}
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}
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/**
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* Tries to close the resource (and ignores BadResource errors).
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* @param {number} rid
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*/
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function tryClose(rid) {
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try {
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core.close(rid);
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} catch (err) {
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// Ignore error if the socket has already been closed.
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if (!(err instanceof Deno.errors.BadResource)) throw err;
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}
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}
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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 wrappedHandler.handler.call(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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Object.defineProperty(emitter, `on${name}`, {
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get() {
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return this[handlerSymbol]?.get(name)?.handler;
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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 = this[handlerSymbol]?.get(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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this[handlerSymbol].set(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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class WebSocket extends EventTarget {
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#readyState = CONNECTING;
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constructor(url, protocols = []) {
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super();
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requiredArguments("WebSocket", arguments.length, 1);
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const wsURL = new URL(url);
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if (wsURL.protocol !== "ws:" && wsURL.protocol !== "wss:") {
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throw new DOMException(
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"Only ws & wss schemes are allowed in a WebSocket URL.",
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"SyntaxError",
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);
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}
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if (wsURL.hash !== "" || wsURL.href.endsWith("#")) {
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throw new DOMException(
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"Fragments are not allowed in a WebSocket URL.",
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"SyntaxError",
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);
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}
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this.#url = wsURL.href;
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core.jsonOpSync("op_ws_check_permission", this.#url);
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if (protocols && typeof protocols === "string") {
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protocols = [protocols];
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}
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if (
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protocols.some((x) => protocols.indexOf(x) !== protocols.lastIndexOf(x))
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) {
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throw new DOMException(
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"Can't supply multiple times the same protocol.",
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"SyntaxError",
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);
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}
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core.jsonOpAsync("op_ws_create", {
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url: wsURL.href,
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protocols: protocols.join(", "),
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}).then((create) => {
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if (create.success) {
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this.#rid = create.rid;
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this.#extensions = create.extensions;
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this.#protocol = create.protocol;
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if (this.#readyState === CLOSING) {
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core.jsonOpAsync("op_ws_close", {
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rid: this.#rid,
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}).then(() => {
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this.#readyState = CLOSED;
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const errEvent = new ErrorEvent("error");
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errEvent.target = this;
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this.dispatchEvent(errEvent);
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const event = new CloseEvent("close");
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event.target = this;
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this.dispatchEvent(event);
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tryClose(this.#rid);
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});
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} else {
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this.#readyState = OPEN;
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const event = new Event("open");
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event.target = this;
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this.dispatchEvent(event);
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this.#eventLoop();
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}
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} else {
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this.#readyState = CLOSED;
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const errEvent = new ErrorEvent("error");
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errEvent.target = this;
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this.dispatchEvent(errEvent);
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const closeEvent = new CloseEvent("close");
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closeEvent.target = this;
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this.dispatchEvent(closeEvent);
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}
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}).catch((err) => {
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this.#readyState = CLOSED;
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const errorEv = new ErrorEvent(
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"error",
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{ error: err, message: err.toString() },
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);
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errorEv.target = this;
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this.dispatchEvent(errorEv);
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const closeEv = new CloseEvent("close");
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closeEv.target = this;
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this.dispatchEvent(closeEv);
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});
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}
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get CONNECTING() {
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return CONNECTING;
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}
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get OPEN() {
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return OPEN;
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}
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get CLOSING() {
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return CLOSING;
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}
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get CLOSED() {
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return CLOSED;
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}
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get readyState() {
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return this.#readyState;
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}
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#extensions = "";
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#protocol = "";
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#url = "";
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#rid;
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get extensions() {
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return this.#extensions;
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}
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get protocol() {
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return this.#protocol;
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}
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#binaryType = "blob";
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get binaryType() {
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return this.#binaryType;
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}
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set binaryType(value) {
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if (value === "blob" || value === "arraybuffer") {
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this.#binaryType = value;
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}
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}
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#bufferedAmount = 0;
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get bufferedAmount() {
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return this.#bufferedAmount;
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}
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get url() {
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return this.#url;
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}
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send(data) {
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requiredArguments("WebSocket.send", arguments.length, 1);
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if (this.#readyState != OPEN) {
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throw Error("readyState not OPEN");
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}
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const sendTypedArray = (ta) => {
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this.#bufferedAmount += ta.size;
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core.jsonOpAsync("op_ws_send", {
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rid: this.#rid,
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kind: "binary",
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}, ta).then(() => {
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this.#bufferedAmount -= ta.size;
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});
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};
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if (data instanceof Blob) {
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data.slice().arrayBuffer().then((ab) =>
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sendTypedArray(new DataView(ab))
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);
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} else if (
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data instanceof Int8Array || data instanceof Int16Array ||
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data instanceof Int32Array || data instanceof Uint8Array ||
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data instanceof Uint16Array || data instanceof Uint32Array ||
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data instanceof Uint8ClampedArray || data instanceof Float32Array ||
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data instanceof Float64Array || data instanceof DataView
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) {
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sendTypedArray(data);
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} else if (data instanceof ArrayBuffer) {
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sendTypedArray(new DataView(data));
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} else {
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const string = String(data);
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const encoder = new TextEncoder();
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const d = encoder.encode(string);
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this.#bufferedAmount += d.size;
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core.jsonOpAsync("op_ws_send", {
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rid: this.#rid,
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kind: "text",
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text: string,
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}).then(() => {
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this.#bufferedAmount -= d.size;
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});
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}
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}
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close(code, reason) {
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if (code && !(code === 1000 || (3000 <= code && code < 5000))) {
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throw new DOMException(
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"The close code must be either 1000 or in the range of 3000 to 4999.",
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"NotSupportedError",
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);
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}
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const encoder = new TextEncoder();
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if (reason && encoder.encode(reason).byteLength > 123) {
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throw new DOMException(
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"The close reason may not be longer than 123 bytes.",
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"SyntaxError",
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);
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}
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if (this.#readyState === CONNECTING) {
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this.#readyState = CLOSING;
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} else if (this.#readyState === OPEN) {
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this.#readyState = CLOSING;
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core.jsonOpAsync("op_ws_close", {
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rid: this.#rid,
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code,
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reason,
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}).then(() => {
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this.#readyState = CLOSED;
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const event = new CloseEvent("close", {
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wasClean: true,
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code,
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reason,
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});
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event.target = this;
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this.dispatchEvent(event);
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tryClose(this.#rid);
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});
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}
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}
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async #eventLoop() {
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while (this.#readyState === OPEN) {
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const message = await core.jsonOpAsync(
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"op_ws_next_event",
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this.#rid,
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);
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switch (message.kind) {
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case "string": {
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const event = new MessageEvent("message", {
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data: message.data,
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origin: this.#url,
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});
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event.target = this;
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this.dispatchEvent(event);
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break;
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}
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case "binary": {
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let data;
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if (this.binaryType === "blob") {
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data = new Blob([new Uint8Array(message.data)]);
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} else {
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data = new Uint8Array(message.data).buffer;
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}
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const event = new MessageEvent("message", {
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data,
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origin: this.#url,
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});
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event.target = this;
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this.dispatchEvent(event);
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break;
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}
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case "ping":
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core.jsonOpAsync("op_ws_send", {
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rid: this.#rid,
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kind: "pong",
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});
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break;
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case "close": {
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this.#readyState = CLOSED;
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const event = new CloseEvent("close", {
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wasClean: true,
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code: message.data.code,
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reason: message.data.reason,
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});
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event.target = this;
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this.dispatchEvent(event);
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tryClose(this.#rid);
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break;
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}
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case "error": {
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this.#readyState = CLOSED;
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const errorEv = new ErrorEvent("error");
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errorEv.target = this;
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this.dispatchEvent(errorEv);
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const closeEv = new CloseEvent("close");
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closeEv.target = this;
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this.dispatchEvent(closeEv);
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tryClose(this.#rid);
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break;
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}
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}
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}
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}
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}
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Object.defineProperties(WebSocket, {
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CONNECTING: {
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value: 0,
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},
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OPEN: {
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value: 1,
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},
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CLOSING: {
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value: 2,
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},
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CLOSED: {
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value: 3,
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},
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});
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defineEventHandler(WebSocket.prototype, "message");
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defineEventHandler(WebSocket.prototype, "error");
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defineEventHandler(WebSocket.prototype, "close");
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defineEventHandler(WebSocket.prototype, "open");
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window.__bootstrap.webSocket = { WebSocket };
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})(this);
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