You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
476 lines
16 KiB
476 lines
16 KiB
1 month ago
|
"use strict";
|
||
|
|
Object.defineProperty(exports, "__esModule", { value: true });
|
||
|
|
exports.Socket = void 0;
|
||
|
|
const events_1 = require("events");
|
||
|
|
const debug_1 = require("debug");
|
||
|
|
const timers_1 = require("timers");
|
||
|
|
const debug = (0, debug_1.default)("engine:socket");
|
||
|
|
class Socket extends events_1.EventEmitter {
|
||
|
|
/**
|
||
|
|
* Client class (abstract).
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
constructor(id, server, transport, req, protocol) {
|
||
|
|
super();
|
||
|
|
this.id = id;
|
||
|
|
this.server = server;
|
||
|
|
this.upgrading = false;
|
||
|
|
this.upgraded = false;
|
||
|
|
this.readyState = "opening";
|
||
|
|
this.writeBuffer = [];
|
||
|
|
this.packetsFn = [];
|
||
|
|
this.sentCallbackFn = [];
|
||
|
|
this.cleanupFn = [];
|
||
|
|
this.request = req;
|
||
|
|
this.protocol = protocol;
|
||
|
|
// Cache IP since it might not be in the req later
|
||
|
|
if (req.websocket && req.websocket._socket) {
|
||
|
|
this.remoteAddress = req.websocket._socket.remoteAddress;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
this.remoteAddress = req.connection.remoteAddress;
|
||
|
|
}
|
||
|
|
this.checkIntervalTimer = null;
|
||
|
|
this.upgradeTimeoutTimer = null;
|
||
|
|
this.pingTimeoutTimer = null;
|
||
|
|
this.pingIntervalTimer = null;
|
||
|
|
this.setTransport(transport);
|
||
|
|
this.onOpen();
|
||
|
|
}
|
||
|
|
get readyState() {
|
||
|
|
return this._readyState;
|
||
|
|
}
|
||
|
|
set readyState(state) {
|
||
|
|
debug("readyState updated from %s to %s", this._readyState, state);
|
||
|
|
this._readyState = state;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Called upon transport considered open.
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
onOpen() {
|
||
|
|
this.readyState = "open";
|
||
|
|
// sends an `open` packet
|
||
|
|
this.transport.sid = this.id;
|
||
|
|
this.sendPacket("open", JSON.stringify({
|
||
|
|
sid: this.id,
|
||
|
|
upgrades: this.getAvailableUpgrades(),
|
||
|
|
pingInterval: this.server.opts.pingInterval,
|
||
|
|
pingTimeout: this.server.opts.pingTimeout,
|
||
|
|
maxPayload: this.server.opts.maxHttpBufferSize,
|
||
|
|
}));
|
||
|
|
if (this.server.opts.initialPacket) {
|
||
|
|
this.sendPacket("message", this.server.opts.initialPacket);
|
||
|
|
}
|
||
|
|
this.emit("open");
|
||
|
|
if (this.protocol === 3) {
|
||
|
|
// in protocol v3, the client sends a ping, and the server answers with a pong
|
||
|
|
this.resetPingTimeout(this.server.opts.pingInterval + this.server.opts.pingTimeout);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
// in protocol v4, the server sends a ping, and the client answers with a pong
|
||
|
|
this.schedulePing();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Called upon transport packet.
|
||
|
|
*
|
||
|
|
* @param {Object} packet
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
onPacket(packet) {
|
||
|
|
if ("open" !== this.readyState) {
|
||
|
|
return debug("packet received with closed socket");
|
||
|
|
}
|
||
|
|
// export packet event
|
||
|
|
debug(`received packet ${packet.type}`);
|
||
|
|
this.emit("packet", packet);
|
||
|
|
// Reset ping timeout on any packet, incoming data is a good sign of
|
||
|
|
// other side's liveness
|
||
|
|
this.resetPingTimeout(this.server.opts.pingInterval + this.server.opts.pingTimeout);
|
||
|
|
switch (packet.type) {
|
||
|
|
case "ping":
|
||
|
|
if (this.transport.protocol !== 3) {
|
||
|
|
this.onError("invalid heartbeat direction");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
debug("got ping");
|
||
|
|
this.sendPacket("pong");
|
||
|
|
this.emit("heartbeat");
|
||
|
|
break;
|
||
|
|
case "pong":
|
||
|
|
if (this.transport.protocol === 3) {
|
||
|
|
this.onError("invalid heartbeat direction");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
debug("got pong");
|
||
|
|
this.pingIntervalTimer.refresh();
|
||
|
|
this.emit("heartbeat");
|
||
|
|
break;
|
||
|
|
case "error":
|
||
|
|
this.onClose("parse error");
|
||
|
|
break;
|
||
|
|
case "message":
|
||
|
|
this.emit("data", packet.data);
|
||
|
|
this.emit("message", packet.data);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Called upon transport error.
|
||
|
|
*
|
||
|
|
* @param {Error} error object
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
onError(err) {
|
||
|
|
debug("transport error");
|
||
|
|
this.onClose("transport error", err);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Pings client every `this.pingInterval` and expects response
|
||
|
|
* within `this.pingTimeout` or closes connection.
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
schedulePing() {
|
||
|
|
this.pingIntervalTimer = (0, timers_1.setTimeout)(() => {
|
||
|
|
debug("writing ping packet - expecting pong within %sms", this.server.opts.pingTimeout);
|
||
|
|
this.sendPacket("ping");
|
||
|
|
this.resetPingTimeout(this.server.opts.pingTimeout);
|
||
|
|
}, this.server.opts.pingInterval);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Resets ping timeout.
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
resetPingTimeout(timeout) {
|
||
|
|
(0, timers_1.clearTimeout)(this.pingTimeoutTimer);
|
||
|
|
this.pingTimeoutTimer = (0, timers_1.setTimeout)(() => {
|
||
|
|
if (this.readyState === "closed")
|
||
|
|
return;
|
||
|
|
this.onClose("ping timeout");
|
||
|
|
}, timeout);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Attaches handlers for the given transport.
|
||
|
|
*
|
||
|
|
* @param {Transport} transport
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
setTransport(transport) {
|
||
|
|
const onError = this.onError.bind(this);
|
||
|
|
const onPacket = this.onPacket.bind(this);
|
||
|
|
const flush = this.flush.bind(this);
|
||
|
|
const onClose = this.onClose.bind(this, "transport close");
|
||
|
|
this.transport = transport;
|
||
|
|
this.transport.once("error", onError);
|
||
|
|
this.transport.on("packet", onPacket);
|
||
|
|
this.transport.on("drain", flush);
|
||
|
|
this.transport.once("close", onClose);
|
||
|
|
// this function will manage packet events (also message callbacks)
|
||
|
|
this.setupSendCallback();
|
||
|
|
this.cleanupFn.push(function () {
|
||
|
|
transport.removeListener("error", onError);
|
||
|
|
transport.removeListener("packet", onPacket);
|
||
|
|
transport.removeListener("drain", flush);
|
||
|
|
transport.removeListener("close", onClose);
|
||
|
|
});
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Upgrades socket to the given transport
|
||
|
|
*
|
||
|
|
* @param {Transport} transport
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
maybeUpgrade(transport) {
|
||
|
|
debug('might upgrade socket transport from "%s" to "%s"', this.transport.name, transport.name);
|
||
|
|
this.upgrading = true;
|
||
|
|
// set transport upgrade timer
|
||
|
|
this.upgradeTimeoutTimer = (0, timers_1.setTimeout)(() => {
|
||
|
|
debug("client did not complete upgrade - closing transport");
|
||
|
|
cleanup();
|
||
|
|
if ("open" === transport.readyState) {
|
||
|
|
transport.close();
|
||
|
|
}
|
||
|
|
}, this.server.opts.upgradeTimeout);
|
||
|
|
const onPacket = (packet) => {
|
||
|
|
if ("ping" === packet.type && "probe" === packet.data) {
|
||
|
|
debug("got probe ping packet, sending pong");
|
||
|
|
transport.send([{ type: "pong", data: "probe" }]);
|
||
|
|
this.emit("upgrading", transport);
|
||
|
|
clearInterval(this.checkIntervalTimer);
|
||
|
|
this.checkIntervalTimer = setInterval(check, 100);
|
||
|
|
}
|
||
|
|
else if ("upgrade" === packet.type && this.readyState !== "closed") {
|
||
|
|
debug("got upgrade packet - upgrading");
|
||
|
|
cleanup();
|
||
|
|
this.transport.discard();
|
||
|
|
this.upgraded = true;
|
||
|
|
this.clearTransport();
|
||
|
|
this.setTransport(transport);
|
||
|
|
this.emit("upgrade", transport);
|
||
|
|
this.flush();
|
||
|
|
if (this.readyState === "closing") {
|
||
|
|
transport.close(() => {
|
||
|
|
this.onClose("forced close");
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
cleanup();
|
||
|
|
transport.close();
|
||
|
|
}
|
||
|
|
};
|
||
|
|
// we force a polling cycle to ensure a fast upgrade
|
||
|
|
const check = () => {
|
||
|
|
if ("polling" === this.transport.name && this.transport.writable) {
|
||
|
|
debug("writing a noop packet to polling for fast upgrade");
|
||
|
|
this.transport.send([{ type: "noop" }]);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
const cleanup = () => {
|
||
|
|
this.upgrading = false;
|
||
|
|
clearInterval(this.checkIntervalTimer);
|
||
|
|
this.checkIntervalTimer = null;
|
||
|
|
(0, timers_1.clearTimeout)(this.upgradeTimeoutTimer);
|
||
|
|
this.upgradeTimeoutTimer = null;
|
||
|
|
transport.removeListener("packet", onPacket);
|
||
|
|
transport.removeListener("close", onTransportClose);
|
||
|
|
transport.removeListener("error", onError);
|
||
|
|
this.removeListener("close", onClose);
|
||
|
|
};
|
||
|
|
const onError = (err) => {
|
||
|
|
debug("client did not complete upgrade - %s", err);
|
||
|
|
cleanup();
|
||
|
|
transport.close();
|
||
|
|
transport = null;
|
||
|
|
};
|
||
|
|
const onTransportClose = () => {
|
||
|
|
onError("transport closed");
|
||
|
|
};
|
||
|
|
const onClose = () => {
|
||
|
|
onError("socket closed");
|
||
|
|
};
|
||
|
|
transport.on("packet", onPacket);
|
||
|
|
transport.once("close", onTransportClose);
|
||
|
|
transport.once("error", onError);
|
||
|
|
this.once("close", onClose);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Clears listeners and timers associated with current transport.
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
clearTransport() {
|
||
|
|
let cleanup;
|
||
|
|
const toCleanUp = this.cleanupFn.length;
|
||
|
|
for (let i = 0; i < toCleanUp; i++) {
|
||
|
|
cleanup = this.cleanupFn.shift();
|
||
|
|
cleanup();
|
||
|
|
}
|
||
|
|
// silence further transport errors and prevent uncaught exceptions
|
||
|
|
this.transport.on("error", function () {
|
||
|
|
debug("error triggered by discarded transport");
|
||
|
|
});
|
||
|
|
// ensure transport won't stay open
|
||
|
|
this.transport.close();
|
||
|
|
(0, timers_1.clearTimeout)(this.pingTimeoutTimer);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Called upon transport considered closed.
|
||
|
|
* Possible reasons: `ping timeout`, `client error`, `parse error`,
|
||
|
|
* `transport error`, `server close`, `transport close`
|
||
|
|
*/
|
||
|
|
onClose(reason, description) {
|
||
|
|
if ("closed" !== this.readyState) {
|
||
|
|
this.readyState = "closed";
|
||
|
|
// clear timers
|
||
|
|
(0, timers_1.clearTimeout)(this.pingIntervalTimer);
|
||
|
|
(0, timers_1.clearTimeout)(this.pingTimeoutTimer);
|
||
|
|
clearInterval(this.checkIntervalTimer);
|
||
|
|
this.checkIntervalTimer = null;
|
||
|
|
(0, timers_1.clearTimeout)(this.upgradeTimeoutTimer);
|
||
|
|
// clean writeBuffer in next tick, so developers can still
|
||
|
|
// grab the writeBuffer on 'close' event
|
||
|
|
process.nextTick(() => {
|
||
|
|
this.writeBuffer = [];
|
||
|
|
});
|
||
|
|
this.packetsFn = [];
|
||
|
|
this.sentCallbackFn = [];
|
||
|
|
this.clearTransport();
|
||
|
|
this.emit("close", reason, description);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Setup and manage send callback
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
setupSendCallback() {
|
||
|
|
// the message was sent successfully, execute the callback
|
||
|
|
const onDrain = () => {
|
||
|
|
if (this.sentCallbackFn.length > 0) {
|
||
|
|
const seqFn = this.sentCallbackFn.splice(0, 1)[0];
|
||
|
|
if ("function" === typeof seqFn) {
|
||
|
|
debug("executing send callback");
|
||
|
|
seqFn(this.transport);
|
||
|
|
}
|
||
|
|
else if (Array.isArray(seqFn)) {
|
||
|
|
debug("executing batch send callback");
|
||
|
|
const l = seqFn.length;
|
||
|
|
let i = 0;
|
||
|
|
for (; i < l; i++) {
|
||
|
|
if ("function" === typeof seqFn[i]) {
|
||
|
|
seqFn[i](this.transport);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
this.transport.on("drain", onDrain);
|
||
|
|
this.cleanupFn.push(() => {
|
||
|
|
this.transport.removeListener("drain", onDrain);
|
||
|
|
});
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Sends a message packet.
|
||
|
|
*
|
||
|
|
* @param {Object} data
|
||
|
|
* @param {Object} options
|
||
|
|
* @param {Function} callback
|
||
|
|
* @return {Socket} for chaining
|
||
|
|
* @api public
|
||
|
|
*/
|
||
|
|
send(data, options, callback) {
|
||
|
|
this.sendPacket("message", data, options, callback);
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Alias of {@link send}.
|
||
|
|
*
|
||
|
|
* @param data
|
||
|
|
* @param options
|
||
|
|
* @param callback
|
||
|
|
*/
|
||
|
|
write(data, options, callback) {
|
||
|
|
this.sendPacket("message", data, options, callback);
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Sends a packet.
|
||
|
|
*
|
||
|
|
* @param {String} type - packet type
|
||
|
|
* @param {String} data
|
||
|
|
* @param {Object} options
|
||
|
|
* @param {Function} callback
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
sendPacket(type, data, options = {}, callback) {
|
||
|
|
if ("function" === typeof options) {
|
||
|
|
callback = options;
|
||
|
|
options = {};
|
||
|
|
}
|
||
|
|
if ("closing" !== this.readyState && "closed" !== this.readyState) {
|
||
|
|
debug('sending packet "%s" (%s)', type, data);
|
||
|
|
// compression is enabled by default
|
||
|
|
options.compress = options.compress !== false;
|
||
|
|
const packet = {
|
||
|
|
type,
|
||
|
|
options: options,
|
||
|
|
};
|
||
|
|
if (data)
|
||
|
|
packet.data = data;
|
||
|
|
// exports packetCreate event
|
||
|
|
this.emit("packetCreate", packet);
|
||
|
|
this.writeBuffer.push(packet);
|
||
|
|
// add send callback to object, if defined
|
||
|
|
if (callback)
|
||
|
|
this.packetsFn.push(callback);
|
||
|
|
this.flush();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Attempts to flush the packets buffer.
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
flush() {
|
||
|
|
if ("closed" !== this.readyState &&
|
||
|
|
this.transport.writable &&
|
||
|
|
this.writeBuffer.length) {
|
||
|
|
debug("flushing buffer to transport");
|
||
|
|
this.emit("flush", this.writeBuffer);
|
||
|
|
this.server.emit("flush", this, this.writeBuffer);
|
||
|
|
const wbuf = this.writeBuffer;
|
||
|
|
this.writeBuffer = [];
|
||
|
|
if (!this.transport.supportsFraming) {
|
||
|
|
this.sentCallbackFn.push(this.packetsFn);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
this.sentCallbackFn.push.apply(this.sentCallbackFn, this.packetsFn);
|
||
|
|
}
|
||
|
|
this.packetsFn = [];
|
||
|
|
this.transport.send(wbuf);
|
||
|
|
this.emit("drain");
|
||
|
|
this.server.emit("drain", this);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Get available upgrades for this socket.
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
getAvailableUpgrades() {
|
||
|
|
const availableUpgrades = [];
|
||
|
|
const allUpgrades = this.server.upgrades(this.transport.name);
|
||
|
|
let i = 0;
|
||
|
|
const l = allUpgrades.length;
|
||
|
|
for (; i < l; ++i) {
|
||
|
|
const upg = allUpgrades[i];
|
||
|
|
if (this.server.opts.transports.indexOf(upg) !== -1) {
|
||
|
|
availableUpgrades.push(upg);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return availableUpgrades;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Closes the socket and underlying transport.
|
||
|
|
*
|
||
|
|
* @param {Boolean} discard - optional, discard the transport
|
||
|
|
* @return {Socket} for chaining
|
||
|
|
* @api public
|
||
|
|
*/
|
||
|
|
close(discard) {
|
||
|
|
if ("open" !== this.readyState)
|
||
|
|
return;
|
||
|
|
this.readyState = "closing";
|
||
|
|
if (this.writeBuffer.length) {
|
||
|
|
debug("there are %d remaining packets in the buffer, waiting for the 'drain' event", this.writeBuffer.length);
|
||
|
|
this.once("drain", () => {
|
||
|
|
debug("all packets have been sent, closing the transport");
|
||
|
|
this.closeTransport(discard);
|
||
|
|
});
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
debug("the buffer is empty, closing the transport right away", discard);
|
||
|
|
this.closeTransport(discard);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Closes the underlying transport.
|
||
|
|
*
|
||
|
|
* @param {Boolean} discard
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
closeTransport(discard) {
|
||
|
|
debug("closing the transport (discard? %s)", discard);
|
||
|
|
if (discard)
|
||
|
|
this.transport.discard();
|
||
|
|
this.transport.close(this.onClose.bind(this, "forced close"));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
exports.Socket = Socket;
|