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614 lines
21 KiB
614 lines
21 KiB
2 years ago
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"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.Socket = void 0;
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const index_js_1 = require("./transports/index.js");
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const util_js_1 = require("./util.js");
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const parseqs_js_1 = require("./contrib/parseqs.js");
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const parseuri_js_1 = require("./contrib/parseuri.js");
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const debug_1 = __importDefault(require("debug")); // debug()
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const component_emitter_1 = require("@socket.io/component-emitter");
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const engine_io_parser_1 = require("engine.io-parser");
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const debug = (0, debug_1.default)("engine.io-client:socket"); // debug()
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class Socket extends component_emitter_1.Emitter {
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/**
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* Socket constructor.
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*
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* @param {String|Object} uri or options
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* @param {Object} opts - options
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* @api public
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*/
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constructor(uri, opts = {}) {
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super();
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if (uri && "object" === typeof uri) {
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opts = uri;
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uri = null;
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}
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if (uri) {
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uri = (0, parseuri_js_1.parse)(uri);
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opts.hostname = uri.host;
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opts.secure = uri.protocol === "https" || uri.protocol === "wss";
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opts.port = uri.port;
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if (uri.query)
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opts.query = uri.query;
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}
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else if (opts.host) {
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opts.hostname = (0, parseuri_js_1.parse)(opts.host).host;
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}
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(0, util_js_1.installTimerFunctions)(this, opts);
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this.secure =
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null != opts.secure
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? opts.secure
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: typeof location !== "undefined" && "https:" === location.protocol;
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if (opts.hostname && !opts.port) {
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// if no port is specified manually, use the protocol default
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opts.port = this.secure ? "443" : "80";
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}
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this.hostname =
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opts.hostname ||
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(typeof location !== "undefined" ? location.hostname : "localhost");
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this.port =
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opts.port ||
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(typeof location !== "undefined" && location.port
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? location.port
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: this.secure
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? "443"
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: "80");
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this.transports = opts.transports || ["polling", "websocket"];
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this.readyState = "";
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this.writeBuffer = [];
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this.prevBufferLen = 0;
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this.opts = Object.assign({
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path: "/engine.io",
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agent: false,
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withCredentials: false,
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upgrade: true,
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timestampParam: "t",
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rememberUpgrade: false,
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rejectUnauthorized: true,
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perMessageDeflate: {
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threshold: 1024
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},
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transportOptions: {},
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closeOnBeforeunload: true
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}, opts);
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this.opts.path = this.opts.path.replace(/\/$/, "") + "/";
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if (typeof this.opts.query === "string") {
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this.opts.query = (0, parseqs_js_1.decode)(this.opts.query);
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}
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// set on handshake
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this.id = null;
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this.upgrades = null;
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this.pingInterval = null;
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this.pingTimeout = null;
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// set on heartbeat
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this.pingTimeoutTimer = null;
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if (typeof addEventListener === "function") {
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if (this.opts.closeOnBeforeunload) {
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// Firefox closes the connection when the "beforeunload" event is emitted but not Chrome. This event listener
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// ensures every browser behaves the same (no "disconnect" event at the Socket.IO level when the page is
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// closed/reloaded)
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this.beforeunloadEventListener = () => {
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if (this.transport) {
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// silently close the transport
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this.transport.removeAllListeners();
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this.transport.close();
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}
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};
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addEventListener("beforeunload", this.beforeunloadEventListener, false);
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}
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if (this.hostname !== "localhost") {
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this.offlineEventListener = () => {
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this.onClose("transport close", {
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description: "network connection lost"
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});
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};
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addEventListener("offline", this.offlineEventListener, false);
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}
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}
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this.open();
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}
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/**
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* Creates transport of the given type.
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*
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* @param {String} transport name
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* @return {Transport}
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* @api private
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*/
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createTransport(name) {
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debug('creating transport "%s"', name);
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const query = Object.assign({}, this.opts.query);
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// append engine.io protocol identifier
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query.EIO = engine_io_parser_1.protocol;
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// transport name
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query.transport = name;
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// session id if we already have one
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if (this.id)
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query.sid = this.id;
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const opts = Object.assign({}, this.opts.transportOptions[name], this.opts, {
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query,
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socket: this,
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hostname: this.hostname,
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secure: this.secure,
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port: this.port
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});
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debug("options: %j", opts);
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return new index_js_1.transports[name](opts);
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}
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/**
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* Initializes transport to use and starts probe.
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*
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* @api private
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*/
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open() {
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let transport;
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if (this.opts.rememberUpgrade &&
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Socket.priorWebsocketSuccess &&
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this.transports.indexOf("websocket") !== -1) {
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transport = "websocket";
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}
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else if (0 === this.transports.length) {
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// Emit error on next tick so it can be listened to
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this.setTimeoutFn(() => {
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this.emitReserved("error", "No transports available");
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}, 0);
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return;
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}
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else {
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transport = this.transports[0];
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}
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this.readyState = "opening";
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// Retry with the next transport if the transport is disabled (jsonp: false)
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try {
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transport = this.createTransport(transport);
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}
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catch (e) {
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debug("error while creating transport: %s", e);
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this.transports.shift();
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this.open();
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return;
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}
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transport.open();
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this.setTransport(transport);
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}
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/**
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* Sets the current transport. Disables the existing one (if any).
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*
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* @api private
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*/
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setTransport(transport) {
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debug("setting transport %s", transport.name);
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if (this.transport) {
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debug("clearing existing transport %s", this.transport.name);
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this.transport.removeAllListeners();
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}
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// set up transport
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this.transport = transport;
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// set up transport listeners
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transport
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.on("drain", this.onDrain.bind(this))
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.on("packet", this.onPacket.bind(this))
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.on("error", this.onError.bind(this))
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.on("close", reason => this.onClose("transport close", reason));
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}
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/**
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* Probes a transport.
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*
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* @param {String} transport name
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* @api private
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*/
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probe(name) {
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debug('probing transport "%s"', name);
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let transport = this.createTransport(name);
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let failed = false;
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Socket.priorWebsocketSuccess = false;
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const onTransportOpen = () => {
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if (failed)
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return;
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debug('probe transport "%s" opened', name);
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transport.send([{ type: "ping", data: "probe" }]);
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transport.once("packet", msg => {
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if (failed)
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return;
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if ("pong" === msg.type && "probe" === msg.data) {
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debug('probe transport "%s" pong', name);
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this.upgrading = true;
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this.emitReserved("upgrading", transport);
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if (!transport)
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return;
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Socket.priorWebsocketSuccess = "websocket" === transport.name;
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debug('pausing current transport "%s"', this.transport.name);
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this.transport.pause(() => {
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if (failed)
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return;
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if ("closed" === this.readyState)
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return;
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debug("changing transport and sending upgrade packet");
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cleanup();
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this.setTransport(transport);
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transport.send([{ type: "upgrade" }]);
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this.emitReserved("upgrade", transport);
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transport = null;
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this.upgrading = false;
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this.flush();
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});
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}
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else {
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debug('probe transport "%s" failed', name);
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const err = new Error("probe error");
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// @ts-ignore
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err.transport = transport.name;
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this.emitReserved("upgradeError", err);
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}
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});
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};
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function freezeTransport() {
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if (failed)
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return;
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// Any callback called by transport should be ignored since now
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failed = true;
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cleanup();
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transport.close();
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transport = null;
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}
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// Handle any error that happens while probing
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const onerror = err => {
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const error = new Error("probe error: " + err);
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// @ts-ignore
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error.transport = transport.name;
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freezeTransport();
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debug('probe transport "%s" failed because of error: %s', name, err);
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this.emitReserved("upgradeError", error);
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};
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function onTransportClose() {
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onerror("transport closed");
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}
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// When the socket is closed while we're probing
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function onclose() {
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onerror("socket closed");
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}
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// When the socket is upgraded while we're probing
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function onupgrade(to) {
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if (transport && to.name !== transport.name) {
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debug('"%s" works - aborting "%s"', to.name, transport.name);
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freezeTransport();
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}
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}
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// Remove all listeners on the transport and on self
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const cleanup = () => {
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transport.removeListener("open", onTransportOpen);
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transport.removeListener("error", onerror);
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transport.removeListener("close", onTransportClose);
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this.off("close", onclose);
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this.off("upgrading", onupgrade);
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};
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transport.once("open", onTransportOpen);
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transport.once("error", onerror);
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transport.once("close", onTransportClose);
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this.once("close", onclose);
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this.once("upgrading", onupgrade);
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transport.open();
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}
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/**
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* Called when connection is deemed open.
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*
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* @api private
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*/
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onOpen() {
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debug("socket open");
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this.readyState = "open";
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Socket.priorWebsocketSuccess = "websocket" === this.transport.name;
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this.emitReserved("open");
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this.flush();
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// we check for `readyState` in case an `open`
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// listener already closed the socket
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if ("open" === this.readyState &&
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this.opts.upgrade &&
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this.transport.pause) {
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debug("starting upgrade probes");
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let i = 0;
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const l = this.upgrades.length;
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for (; i < l; i++) {
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this.probe(this.upgrades[i]);
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}
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}
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}
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/**
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* Handles a packet.
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*
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* @api private
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*/
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onPacket(packet) {
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if ("opening" === this.readyState ||
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"open" === this.readyState ||
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"closing" === this.readyState) {
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debug('socket receive: type "%s", data "%s"', packet.type, packet.data);
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this.emitReserved("packet", packet);
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// Socket is live - any packet counts
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this.emitReserved("heartbeat");
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switch (packet.type) {
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case "open":
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this.onHandshake(JSON.parse(packet.data));
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break;
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case "ping":
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this.resetPingTimeout();
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this.sendPacket("pong");
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this.emitReserved("ping");
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this.emitReserved("pong");
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break;
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case "error":
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const err = new Error("server error");
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// @ts-ignore
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err.code = packet.data;
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this.onError(err);
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break;
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case "message":
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this.emitReserved("data", packet.data);
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this.emitReserved("message", packet.data);
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break;
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}
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}
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else {
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debug('packet received with socket readyState "%s"', this.readyState);
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}
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}
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/**
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* Called upon handshake completion.
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*
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* @param {Object} data - handshake obj
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* @api private
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*/
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onHandshake(data) {
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this.emitReserved("handshake", data);
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this.id = data.sid;
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this.transport.query.sid = data.sid;
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this.upgrades = this.filterUpgrades(data.upgrades);
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this.pingInterval = data.pingInterval;
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this.pingTimeout = data.pingTimeout;
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this.maxPayload = data.maxPayload;
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this.onOpen();
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// In case open handler closes socket
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if ("closed" === this.readyState)
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return;
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this.resetPingTimeout();
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}
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/**
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* Sets and resets ping timeout timer based on server pings.
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*
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* @api private
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||
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*/
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resetPingTimeout() {
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this.clearTimeoutFn(this.pingTimeoutTimer);
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this.pingTimeoutTimer = this.setTimeoutFn(() => {
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|
|
this.onClose("ping timeout");
|
||
|
|
}, this.pingInterval + this.pingTimeout);
|
||
|
|
if (this.opts.autoUnref) {
|
||
|
|
this.pingTimeoutTimer.unref();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Called on `drain` event
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
onDrain() {
|
||
|
|
this.writeBuffer.splice(0, this.prevBufferLen);
|
||
|
|
// setting prevBufferLen = 0 is very important
|
||
|
|
// for example, when upgrading, upgrade packet is sent over,
|
||
|
|
// and a nonzero prevBufferLen could cause problems on `drain`
|
||
|
|
this.prevBufferLen = 0;
|
||
|
|
if (0 === this.writeBuffer.length) {
|
||
|
|
this.emitReserved("drain");
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
this.flush();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Flush write buffers.
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
flush() {
|
||
|
|
if ("closed" !== this.readyState &&
|
||
|
|
this.transport.writable &&
|
||
|
|
!this.upgrading &&
|
||
|
|
this.writeBuffer.length) {
|
||
|
|
const packets = this.getWritablePackets();
|
||
|
|
debug("flushing %d packets in socket", packets.length);
|
||
|
|
this.transport.send(packets);
|
||
|
|
// keep track of current length of writeBuffer
|
||
|
|
// splice writeBuffer and callbackBuffer on `drain`
|
||
|
|
this.prevBufferLen = packets.length;
|
||
|
|
this.emitReserved("flush");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Ensure the encoded size of the writeBuffer is below the maxPayload value sent by the server (only for HTTP
|
||
|
|
* long-polling)
|
||
|
|
*
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
getWritablePackets() {
|
||
|
|
const shouldCheckPayloadSize = this.maxPayload &&
|
||
|
|
this.transport.name === "polling" &&
|
||
|
|
this.writeBuffer.length > 1;
|
||
|
|
if (!shouldCheckPayloadSize) {
|
||
|
|
return this.writeBuffer;
|
||
|
|
}
|
||
|
|
let payloadSize = 1; // first packet type
|
||
|
|
for (let i = 0; i < this.writeBuffer.length; i++) {
|
||
|
|
const data = this.writeBuffer[i].data;
|
||
|
|
if (data) {
|
||
|
|
payloadSize += (0, util_js_1.byteLength)(data);
|
||
|
|
}
|
||
|
|
if (i > 0 && payloadSize > this.maxPayload) {
|
||
|
|
debug("only send %d out of %d packets", i, this.writeBuffer.length);
|
||
|
|
return this.writeBuffer.slice(0, i);
|
||
|
|
}
|
||
|
|
payloadSize += 2; // separator + packet type
|
||
|
|
}
|
||
|
|
debug("payload size is %d (max: %d)", payloadSize, this.maxPayload);
|
||
|
|
return this.writeBuffer;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Sends a message.
|
||
|
|
*
|
||
|
|
* @param {String} message.
|
||
|
|
* @param {Function} callback function.
|
||
|
|
* @param {Object} options.
|
||
|
|
* @return {Socket} for chaining.
|
||
|
|
* @api public
|
||
|
|
*/
|
||
|
|
write(msg, options, fn) {
|
||
|
|
this.sendPacket("message", msg, options, fn);
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
send(msg, options, fn) {
|
||
|
|
this.sendPacket("message", msg, options, fn);
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Sends a packet.
|
||
|
|
*
|
||
|
|
* @param {String} packet type.
|
||
|
|
* @param {String} data.
|
||
|
|
* @param {Object} options.
|
||
|
|
* @param {Function} callback function.
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
sendPacket(type, data, options, fn) {
|
||
|
|
if ("function" === typeof data) {
|
||
|
|
fn = data;
|
||
|
|
data = undefined;
|
||
|
|
}
|
||
|
|
if ("function" === typeof options) {
|
||
|
|
fn = options;
|
||
|
|
options = null;
|
||
|
|
}
|
||
|
|
if ("closing" === this.readyState || "closed" === this.readyState) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
options = options || {};
|
||
|
|
options.compress = false !== options.compress;
|
||
|
|
const packet = {
|
||
|
|
type: type,
|
||
|
|
data: data,
|
||
|
|
options: options
|
||
|
|
};
|
||
|
|
this.emitReserved("packetCreate", packet);
|
||
|
|
this.writeBuffer.push(packet);
|
||
|
|
if (fn)
|
||
|
|
this.once("flush", fn);
|
||
|
|
this.flush();
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Closes the connection.
|
||
|
|
*
|
||
|
|
* @api public
|
||
|
|
*/
|
||
|
|
close() {
|
||
|
|
const close = () => {
|
||
|
|
this.onClose("forced close");
|
||
|
|
debug("socket closing - telling transport to close");
|
||
|
|
this.transport.close();
|
||
|
|
};
|
||
|
|
const cleanupAndClose = () => {
|
||
|
|
this.off("upgrade", cleanupAndClose);
|
||
|
|
this.off("upgradeError", cleanupAndClose);
|
||
|
|
close();
|
||
|
|
};
|
||
|
|
const waitForUpgrade = () => {
|
||
|
|
// wait for upgrade to finish since we can't send packets while pausing a transport
|
||
|
|
this.once("upgrade", cleanupAndClose);
|
||
|
|
this.once("upgradeError", cleanupAndClose);
|
||
|
|
};
|
||
|
|
if ("opening" === this.readyState || "open" === this.readyState) {
|
||
|
|
this.readyState = "closing";
|
||
|
|
if (this.writeBuffer.length) {
|
||
|
|
this.once("drain", () => {
|
||
|
|
if (this.upgrading) {
|
||
|
|
waitForUpgrade();
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
close();
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
else if (this.upgrading) {
|
||
|
|
waitForUpgrade();
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
close();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Called upon transport error
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
onError(err) {
|
||
|
|
debug("socket error %j", err);
|
||
|
|
Socket.priorWebsocketSuccess = false;
|
||
|
|
this.emitReserved("error", err);
|
||
|
|
this.onClose("transport error", err);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Called upon transport close.
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
onClose(reason, description) {
|
||
|
|
if ("opening" === this.readyState ||
|
||
|
|
"open" === this.readyState ||
|
||
|
|
"closing" === this.readyState) {
|
||
|
|
debug('socket close with reason: "%s"', reason);
|
||
|
|
// clear timers
|
||
|
|
this.clearTimeoutFn(this.pingTimeoutTimer);
|
||
|
|
// stop event from firing again for transport
|
||
|
|
this.transport.removeAllListeners("close");
|
||
|
|
// ensure transport won't stay open
|
||
|
|
this.transport.close();
|
||
|
|
// ignore further transport communication
|
||
|
|
this.transport.removeAllListeners();
|
||
|
|
if (typeof removeEventListener === "function") {
|
||
|
|
removeEventListener("beforeunload", this.beforeunloadEventListener, false);
|
||
|
|
removeEventListener("offline", this.offlineEventListener, false);
|
||
|
|
}
|
||
|
|
// set ready state
|
||
|
|
this.readyState = "closed";
|
||
|
|
// clear session id
|
||
|
|
this.id = null;
|
||
|
|
// emit close event
|
||
|
|
this.emitReserved("close", reason, description);
|
||
|
|
// clean buffers after, so users can still
|
||
|
|
// grab the buffers on `close` event
|
||
|
|
this.writeBuffer = [];
|
||
|
|
this.prevBufferLen = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Filters upgrades, returning only those matching client transports.
|
||
|
|
*
|
||
|
|
* @param {Array} server upgrades
|
||
|
|
* @api private
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
filterUpgrades(upgrades) {
|
||
|
|
const filteredUpgrades = [];
|
||
|
|
let i = 0;
|
||
|
|
const j = upgrades.length;
|
||
|
|
for (; i < j; i++) {
|
||
|
|
if (~this.transports.indexOf(upgrades[i]))
|
||
|
|
filteredUpgrades.push(upgrades[i]);
|
||
|
|
}
|
||
|
|
return filteredUpgrades;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
exports.Socket = Socket;
|
||
|
|
Socket.protocol = engine_io_parser_1.protocol;
|