476 lines
16 KiB
JavaScript
476 lines
16 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.Socket = void 0;
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const events_1 = require("events");
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const debug_1 = require("debug");
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const timers_1 = require("timers");
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const debug = (0, debug_1.default)("engine:socket");
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class Socket extends events_1.EventEmitter {
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/**
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* Client class (abstract).
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*
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* @api private
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*/
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constructor(id, server, transport, req, protocol) {
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super();
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this.id = id;
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this.server = server;
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this.upgrading = false;
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this.upgraded = false;
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this.readyState = "opening";
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this.writeBuffer = [];
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this.packetsFn = [];
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this.sentCallbackFn = [];
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this.cleanupFn = [];
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this.request = req;
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this.protocol = protocol;
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// Cache IP since it might not be in the req later
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if (req.websocket && req.websocket._socket) {
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this.remoteAddress = req.websocket._socket.remoteAddress;
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}
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else {
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this.remoteAddress = req.connection.remoteAddress;
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}
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this.checkIntervalTimer = null;
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this.upgradeTimeoutTimer = null;
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this.pingTimeoutTimer = null;
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this.pingIntervalTimer = null;
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this.setTransport(transport);
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this.onOpen();
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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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set readyState(state) {
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debug("readyState updated from %s to %s", this._readyState, state);
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this._readyState = state;
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}
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/**
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* Called upon transport considered open.
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*
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* @api private
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*/
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onOpen() {
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this.readyState = "open";
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// sends an `open` packet
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this.transport.sid = this.id;
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this.sendPacket("open", JSON.stringify({
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sid: this.id,
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upgrades: this.getAvailableUpgrades(),
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pingInterval: this.server.opts.pingInterval,
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pingTimeout: this.server.opts.pingTimeout,
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maxPayload: this.server.opts.maxHttpBufferSize,
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}));
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if (this.server.opts.initialPacket) {
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this.sendPacket("message", this.server.opts.initialPacket);
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}
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this.emit("open");
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if (this.protocol === 3) {
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// in protocol v3, the client sends a ping, and the server answers with a pong
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this.resetPingTimeout(this.server.opts.pingInterval + this.server.opts.pingTimeout);
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}
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else {
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// in protocol v4, the server sends a ping, and the client answers with a pong
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this.schedulePing();
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}
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}
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/**
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* Called upon transport packet.
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*
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* @param {Object} packet
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* @api private
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*/
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onPacket(packet) {
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if ("open" !== this.readyState) {
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return debug("packet received with closed socket");
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}
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// export packet event
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debug(`received packet ${packet.type}`);
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this.emit("packet", packet);
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// Reset ping timeout on any packet, incoming data is a good sign of
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// other side's liveness
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this.resetPingTimeout(this.server.opts.pingInterval + this.server.opts.pingTimeout);
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switch (packet.type) {
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case "ping":
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if (this.transport.protocol !== 3) {
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this.onError("invalid heartbeat direction");
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return;
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}
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debug("got ping");
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this.sendPacket("pong");
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this.emit("heartbeat");
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break;
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case "pong":
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if (this.transport.protocol === 3) {
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this.onError("invalid heartbeat direction");
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return;
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}
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debug("got pong");
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this.pingIntervalTimer.refresh();
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this.emit("heartbeat");
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break;
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case "error":
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this.onClose("parse error");
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break;
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case "message":
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this.emit("data", packet.data);
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this.emit("message", packet.data);
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break;
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}
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}
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/**
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* Called upon transport error.
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*
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* @param {Error} error object
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* @api private
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*/
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onError(err) {
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debug("transport error");
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this.onClose("transport error", err);
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}
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/**
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* Pings client every `this.pingInterval` and expects response
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* within `this.pingTimeout` or closes connection.
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*
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* @api private
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*/
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schedulePing() {
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this.pingIntervalTimer = (0, timers_1.setTimeout)(() => {
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debug("writing ping packet - expecting pong within %sms", this.server.opts.pingTimeout);
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this.sendPacket("ping");
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this.resetPingTimeout(this.server.opts.pingTimeout);
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}, this.server.opts.pingInterval);
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}
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/**
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* Resets ping timeout.
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*
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* @api private
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*/
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resetPingTimeout(timeout) {
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(0, timers_1.clearTimeout)(this.pingTimeoutTimer);
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this.pingTimeoutTimer = (0, timers_1.setTimeout)(() => {
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if (this.readyState === "closed")
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return;
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this.onClose("ping timeout");
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}, timeout);
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}
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/**
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* Attaches handlers for the given transport.
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*
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* @param {Transport} transport
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* @api private
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*/
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setTransport(transport) {
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const onError = this.onError.bind(this);
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const onPacket = this.onPacket.bind(this);
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const flush = this.flush.bind(this);
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const onClose = this.onClose.bind(this, "transport close");
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this.transport = transport;
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this.transport.once("error", onError);
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this.transport.on("packet", onPacket);
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this.transport.on("drain", flush);
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this.transport.once("close", onClose);
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// this function will manage packet events (also message callbacks)
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this.setupSendCallback();
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this.cleanupFn.push(function () {
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transport.removeListener("error", onError);
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transport.removeListener("packet", onPacket);
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transport.removeListener("drain", flush);
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transport.removeListener("close", onClose);
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});
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}
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/**
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* Upgrades socket to the given transport
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*
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* @param {Transport} transport
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* @api private
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*/
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maybeUpgrade(transport) {
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debug('might upgrade socket transport from "%s" to "%s"', this.transport.name, transport.name);
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this.upgrading = true;
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// set transport upgrade timer
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this.upgradeTimeoutTimer = (0, timers_1.setTimeout)(() => {
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debug("client did not complete upgrade - closing transport");
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cleanup();
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if ("open" === transport.readyState) {
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transport.close();
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}
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}, this.server.opts.upgradeTimeout);
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const onPacket = (packet) => {
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if ("ping" === packet.type && "probe" === packet.data) {
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debug("got probe ping packet, sending pong");
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transport.send([{ type: "pong", data: "probe" }]);
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this.emit("upgrading", transport);
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clearInterval(this.checkIntervalTimer);
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this.checkIntervalTimer = setInterval(check, 100);
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}
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else if ("upgrade" === packet.type && this.readyState !== "closed") {
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debug("got upgrade packet - upgrading");
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cleanup();
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this.transport.discard();
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this.upgraded = true;
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this.clearTransport();
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this.setTransport(transport);
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this.emit("upgrade", transport);
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this.flush();
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if (this.readyState === "closing") {
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transport.close(() => {
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this.onClose("forced close");
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});
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}
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}
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else {
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cleanup();
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transport.close();
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}
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};
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// we force a polling cycle to ensure a fast upgrade
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const check = () => {
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if ("polling" === this.transport.name && this.transport.writable) {
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debug("writing a noop packet to polling for fast upgrade");
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this.transport.send([{ type: "noop" }]);
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}
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};
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const cleanup = () => {
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this.upgrading = false;
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clearInterval(this.checkIntervalTimer);
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this.checkIntervalTimer = null;
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(0, timers_1.clearTimeout)(this.upgradeTimeoutTimer);
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this.upgradeTimeoutTimer = null;
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transport.removeListener("packet", onPacket);
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transport.removeListener("close", onTransportClose);
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transport.removeListener("error", onError);
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this.removeListener("close", onClose);
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};
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const onError = (err) => {
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debug("client did not complete upgrade - %s", err);
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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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const onTransportClose = () => {
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onError("transport closed");
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};
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const onClose = () => {
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onError("socket closed");
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};
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transport.on("packet", onPacket);
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transport.once("close", onTransportClose);
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transport.once("error", onError);
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this.once("close", onClose);
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}
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/**
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* Clears listeners and timers associated with current transport.
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*
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* @api private
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*/
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clearTransport() {
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let cleanup;
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const toCleanUp = this.cleanupFn.length;
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for (let i = 0; i < toCleanUp; i++) {
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cleanup = this.cleanupFn.shift();
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cleanup();
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}
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// silence further transport errors and prevent uncaught exceptions
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this.transport.on("error", function () {
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debug("error triggered by discarded transport");
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});
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// ensure transport won't stay open
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this.transport.close();
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(0, timers_1.clearTimeout)(this.pingTimeoutTimer);
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}
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/**
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* Called upon transport considered closed.
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* Possible reasons: `ping timeout`, `client error`, `parse error`,
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* `transport error`, `server close`, `transport close`
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*/
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onClose(reason, description) {
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if ("closed" !== this.readyState) {
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this.readyState = "closed";
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// clear timers
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(0, timers_1.clearTimeout)(this.pingIntervalTimer);
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(0, timers_1.clearTimeout)(this.pingTimeoutTimer);
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clearInterval(this.checkIntervalTimer);
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this.checkIntervalTimer = null;
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(0, timers_1.clearTimeout)(this.upgradeTimeoutTimer);
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// clean writeBuffer in next tick, so developers can still
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// grab the writeBuffer on 'close' event
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process.nextTick(() => {
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this.writeBuffer = [];
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});
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this.packetsFn = [];
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this.sentCallbackFn = [];
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this.clearTransport();
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this.emit("close", reason, description);
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}
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}
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/**
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* Setup and manage send callback
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*
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* @api private
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*/
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setupSendCallback() {
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// the message was sent successfully, execute the callback
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const onDrain = () => {
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if (this.sentCallbackFn.length > 0) {
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const seqFn = this.sentCallbackFn.splice(0, 1)[0];
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if ("function" === typeof seqFn) {
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debug("executing send callback");
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seqFn(this.transport);
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}
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else if (Array.isArray(seqFn)) {
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debug("executing batch send callback");
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const l = seqFn.length;
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let i = 0;
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for (; i < l; i++) {
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if ("function" === typeof seqFn[i]) {
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seqFn[i](this.transport);
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}
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}
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}
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}
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};
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this.transport.on("drain", onDrain);
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this.cleanupFn.push(() => {
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this.transport.removeListener("drain", onDrain);
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});
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}
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/**
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* Sends a message packet.
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*
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* @param {Object} data
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* @param {Object} options
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* @param {Function} callback
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* @return {Socket} for chaining
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* @api public
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*/
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send(data, options, callback) {
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this.sendPacket("message", data, options, callback);
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return this;
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}
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/**
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* Alias of {@link send}.
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*
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* @param data
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* @param options
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* @param callback
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*/
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write(data, options, callback) {
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this.sendPacket("message", data, options, callback);
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return this;
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}
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/**
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* Sends a packet.
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*
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* @param {String} type - packet type
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* @param {String} data
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* @param {Object} options
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* @param {Function} callback
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*
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* @api private
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*/
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sendPacket(type, data, options = {}, callback) {
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if ("function" === typeof options) {
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callback = options;
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options = {};
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}
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if ("closing" !== this.readyState && "closed" !== this.readyState) {
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debug('sending packet "%s" (%s)', type, data);
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// compression is enabled by default
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options.compress = options.compress !== false;
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const packet = {
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type,
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options: options,
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};
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if (data)
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packet.data = data;
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// exports packetCreate event
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this.emit("packetCreate", packet);
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this.writeBuffer.push(packet);
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// add send callback to object, if defined
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if (callback)
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this.packetsFn.push(callback);
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this.flush();
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}
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}
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/**
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* Attempts to flush the packets buffer.
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*
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* @api private
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*/
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flush() {
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if ("closed" !== this.readyState &&
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this.transport.writable &&
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this.writeBuffer.length) {
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debug("flushing buffer to transport");
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this.emit("flush", this.writeBuffer);
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this.server.emit("flush", this, this.writeBuffer);
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const wbuf = this.writeBuffer;
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this.writeBuffer = [];
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if (!this.transport.supportsFraming) {
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this.sentCallbackFn.push(this.packetsFn);
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}
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else {
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this.sentCallbackFn.push.apply(this.sentCallbackFn, this.packetsFn);
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}
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this.packetsFn = [];
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this.transport.send(wbuf);
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this.emit("drain");
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this.server.emit("drain", this);
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}
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}
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/**
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* Get available upgrades for this socket.
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*
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* @api private
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*/
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getAvailableUpgrades() {
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const availableUpgrades = [];
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const allUpgrades = this.server.upgrades(this.transport.name);
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let i = 0;
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const l = allUpgrades.length;
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for (; i < l; ++i) {
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const upg = allUpgrades[i];
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if (this.server.opts.transports.indexOf(upg) !== -1) {
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availableUpgrades.push(upg);
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}
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}
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return availableUpgrades;
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}
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/**
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* Closes the socket and underlying transport.
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*
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* @param {Boolean} discard - optional, discard the transport
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* @return {Socket} for chaining
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* @api public
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*/
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close(discard) {
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if ("open" !== this.readyState)
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return;
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this.readyState = "closing";
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if (this.writeBuffer.length) {
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debug("there are %d remaining packets in the buffer, waiting for the 'drain' event", this.writeBuffer.length);
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this.once("drain", () => {
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debug("all packets have been sent, closing the transport");
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this.closeTransport(discard);
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});
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return;
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}
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debug("the buffer is empty, closing the transport right away", discard);
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this.closeTransport(discard);
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}
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/**
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* Closes the underlying transport.
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*
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* @param {Boolean} discard
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* @api private
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*/
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closeTransport(discard) {
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debug("closing the transport (discard? %s)", discard);
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if (discard)
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this.transport.discard();
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this.transport.close(this.onClose.bind(this, "forced close"));
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}
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}
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exports.Socket = Socket;
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