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import { PacketType } from "socket.io-parser";
import { on } from "./on.js";
import { Emitter, } from "@socket.io/component-emitter";
import debugModule from "debug"; // debug()
const debug = debugModule("socket.io-client:socket"); // debug()
/**
* Internal events.
* These events can't be emitted by the user.
*/
const RESERVED_EVENTS = Object.freeze({
connect: 1,
connect_error: 1,
disconnect: 1,
disconnecting: 1,
// EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
newListener: 1,
removeListener: 1,
});
/**
* A Socket is the fundamental class for interacting with the server.
*
* A Socket belongs to a certain Namespace (by default /) and uses an underlying {@link Manager} to communicate.
*
* @example
* const socket = io();
*
* socket.on("connect", () => {
* console.log("connected");
* });
*
* // send an event to the server
* socket.emit("foo", "bar");
*
* socket.on("foobar", () => {
* // an event was received from the server
* });
*
* // upon disconnection
* socket.on("disconnect", (reason) => {
* console.log(`disconnected due to ${reason}`);
* });
*/
export class Socket extends Emitter {
/**
* `Socket` constructor.
*/
constructor(io, nsp, opts) {
super();
/**
* Whether the socket is currently connected to the server.
*
* @example
* const socket = io();
*
* socket.on("connect", () => {
* console.log(socket.connected); // true
* });
*
* socket.on("disconnect", () => {
* console.log(socket.connected); // false
* });
*/
this.connected = false;
/**
* Whether the connection state was recovered after a temporary disconnection. In that case, any missed packets will
* be transmitted by the server.
*/
this.recovered = false;
/**
* Buffer for packets received before the CONNECT packet
*/
this.receiveBuffer = [];
/**
* Buffer for packets that will be sent once the socket is connected
*/
this.sendBuffer = [];
/**
* The queue of packets to be sent with retry in case of failure.
*
* Packets are sent one by one, each waiting for the server acknowledgement, in order to guarantee the delivery order.
* @private
*/
this._queue = [];
/**
* A sequence to generate the ID of the {@link QueuedPacket}.
* @private
*/
this._queueSeq = 0;
this.ids = 0;
/**
* A map containing acknowledgement handlers.
*
* The `withError` attribute is used to differentiate handlers that accept an error as first argument:
*
* - `socket.emit("test", (err, value) => { ... })` with `ackTimeout` option
* - `socket.timeout(5000).emit("test", (err, value) => { ... })`
* - `const value = await socket.emitWithAck("test")`
*
* From those that don't:
*
* - `socket.emit("test", (value) => { ... });`
*
* In the first case, the handlers will be called with an error when:
*
* - the timeout is reached
* - the socket gets disconnected
*
* In the second case, the handlers will be simply discarded upon disconnection, since the client will never receive
* an acknowledgement from the server.
*
* @private
*/
this.acks = {};
this.flags = {};
this.io = io;
this.nsp = nsp;
if (opts && opts.auth) {
this.auth = opts.auth;
}
this._opts = Object.assign({}, opts);
if (this.io._autoConnect)
this.open();
}
/**
* Whether the socket is currently disconnected
*
* @example
* const socket = io();
*
* socket.on("connect", () => {
* console.log(socket.disconnected); // false
* });
*
* socket.on("disconnect", () => {
* console.log(socket.disconnected); // true
* });
*/
get disconnected() {
return !this.connected;
}
/**
* Subscribe to open, close and packet events
*
* @private
*/
subEvents() {
if (this.subs)
return;
const io = this.io;
this.subs = [
on(io, "open", this.onopen.bind(this)),
on(io, "packet", this.onpacket.bind(this)),
on(io, "error", this.onerror.bind(this)),
on(io, "close", this.onclose.bind(this)),
];
}
/**
* Whether the Socket will try to reconnect when its Manager connects or reconnects.
*
* @example
* const socket = io();
*
* console.log(socket.active); // true
*
* socket.on("disconnect", (reason) => {
* if (reason === "io server disconnect") {
* // the disconnection was initiated by the server, you need to manually reconnect
* console.log(socket.active); // false
* }
* // else the socket will automatically try to reconnect
* console.log(socket.active); // true
* });
*/
get active() {
return !!this.subs;
}
/**
* "Opens" the socket.
*
* @example
* const socket = io({
* autoConnect: false
* });
*
* socket.connect();
*/
connect() {
if (this.connected)
return this;
this.subEvents();
if (!this.io["_reconnecting"])
this.io.open(); // ensure open
if ("open" === this.io._readyState)
this.onopen();
return this;
}
/**
* Alias for {@link connect()}.
*/
open() {
return this.connect();
}
/**
* Sends a `message` event.
*
* This method mimics the WebSocket.send() method.
*
* @see https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/send
*
* @example
* socket.send("hello");
*
* // this is equivalent to
* socket.emit("message", "hello");
*
* @return self
*/
send(...args) {
args.unshift("message");
this.emit.apply(this, args);
return this;
}
/**
* Override `emit`.
* If the event is in `events`, it's emitted normally.
*
* @example
* socket.emit("hello", "world");
*
* // all serializable datastructures are supported (no need to call JSON.stringify)
* socket.emit("hello", 1, "2", { 3: ["4"], 5: Uint8Array.from([6]) });
*
* // with an acknowledgement from the server
* socket.emit("hello", "world", (val) => {
* // ...
* });
*
* @return self
*/
emit(ev, ...args) {
if (RESERVED_EVENTS.hasOwnProperty(ev)) {
throw new Error('"' + ev.toString() + '" is a reserved event name');
}
args.unshift(ev);
if (this._opts.retries && !this.flags.fromQueue && !this.flags.volatile) {
this._addToQueue(args);
return this;
}
const packet = {
type: PacketType.EVENT,
data: args,
};
packet.options = {};
packet.options.compress = this.flags.compress !== false;
// event ack callback
if ("function" === typeof args[args.length - 1]) {
const id = this.ids++;
debug("emitting packet with ack id %d", id);
const ack = args.pop();
this._registerAckCallback(id, ack);
packet.id = id;
}
const isTransportWritable = this.io.engine &&
this.io.engine.transport &&
this.io.engine.transport.writable;
const discardPacket = this.flags.volatile && (!isTransportWritable || !this.connected);
if (discardPacket) {
debug("discard packet as the transport is not currently writable");
}
else if (this.connected) {
this.notifyOutgoingListeners(packet);
this.packet(packet);
}
else {
this.sendBuffer.push(packet);
}
this.flags = {};
return this;
}
/**
* @private
*/
_registerAckCallback(id, ack) {
var _a;
const timeout = (_a = this.flags.timeout) !== null && _a !== void 0 ? _a : this._opts.ackTimeout;
if (timeout === undefined) {
this.acks[id] = ack;
return;
}
// @ts-ignore
const timer = this.io.setTimeoutFn(() => {
delete this.acks[id];
for (let i = 0; i < this.sendBuffer.length; i++) {
if (this.sendBuffer[i].id === id) {
debug("removing packet with ack id %d from the buffer", id);
this.sendBuffer.splice(i, 1);
}
}
debug("event with ack id %d has timed out after %d ms", id, timeout);
ack.call(this, new Error("operation has timed out"));
}, timeout);
const fn = (...args) => {
// @ts-ignore
this.io.clearTimeoutFn(timer);
ack.apply(this, args);
};
fn.withError = true;
this.acks[id] = fn;
}
/**
* Emits an event and waits for an acknowledgement
*
* @example
* // without timeout
* const response = await socket.emitWithAck("hello", "world");
*
* // with a specific timeout
* try {
* const response = await socket.timeout(1000).emitWithAck("hello", "world");
* } catch (err) {
* // the server did not acknowledge the event in the given delay
* }
*
* @return a Promise that will be fulfilled when the server acknowledges the event
*/
emitWithAck(ev, ...args) {
return new Promise((resolve, reject) => {
const fn = (arg1, arg2) => {
return arg1 ? reject(arg1) : resolve(arg2);
};
fn.withError = true;
args.push(fn);
this.emit(ev, ...args);
});
}
/**
* Add the packet to the queue.
* @param args
* @private
*/
_addToQueue(args) {
let ack;
if (typeof args[args.length - 1] === "function") {
ack = args.pop();
}
const packet = {
id: this._queueSeq++,
tryCount: 0,
pending: false,
args,
flags: Object.assign({ fromQueue: true }, this.flags),
};
args.push((err, ...responseArgs) => {
if (packet !== this._queue[0]) {
// the packet has already been acknowledged
return;
}
const hasError = err !== null;
if (hasError) {
if (packet.tryCount > this._opts.retries) {
debug("packet [%d] is discarded after %d tries", packet.id, packet.tryCount);
this._queue.shift();
if (ack) {
ack(err);
}
}
}
else {
debug("packet [%d] was successfully sent", packet.id);
this._queue.shift();
if (ack) {
ack(null, ...responseArgs);
}
}
packet.pending = false;
return this._drainQueue();
});
this._queue.push(packet);
this._drainQueue();
}
/**
* Send the first packet of the queue, and wait for an acknowledgement from the server.
* @param force - whether to resend a packet that has not been acknowledged yet
*
* @private
*/
_drainQueue(force = false) {
debug("draining queue");
if (!this.connected || this._queue.length === 0) {
return;
}
const packet = this._queue[0];
if (packet.pending && !force) {
debug("packet [%d] has already been sent and is waiting for an ack", packet.id);
return;
}
packet.pending = true;
packet.tryCount++;
debug("sending packet [%d] (try n°%d)", packet.id, packet.tryCount);
this.flags = packet.flags;
this.emit.apply(this, packet.args);
}
/**
* Sends a packet.
*
* @param packet
* @private
*/
packet(packet) {
packet.nsp = this.nsp;
this.io._packet(packet);
}
/**
* Called upon engine `open`.
*
* @private
*/
onopen() {
debug("transport is open - connecting");
if (typeof this.auth == "function") {
this.auth((data) => {
this._sendConnectPacket(data);
});
}
else {
this._sendConnectPacket(this.auth);
}
}
/**
* Sends a CONNECT packet to initiate the Socket.IO session.
*
* @param data
* @private
*/
_sendConnectPacket(data) {
this.packet({
type: PacketType.CONNECT,
data: this._pid
? Object.assign({ pid: this._pid, offset: this._lastOffset }, data)
: data,
});
}
/**
* Called upon engine or manager `error`.
*
* @param err
* @private
*/
onerror(err) {
if (!this.connected) {
this.emitReserved("connect_error", err);
}
}
/**
* Called upon engine `close`.
*
* @param reason
* @param description
* @private
*/
onclose(reason, description) {
debug("close (%s)", reason);
this.connected = false;
delete this.id;
this.emitReserved("disconnect", reason, description);
this._clearAcks();
}
/**
* Clears the acknowledgement handlers upon disconnection, since the client will never receive an acknowledgement from
* the server.
*
* @private
*/
_clearAcks() {
Object.keys(this.acks).forEach((id) => {
const isBuffered = this.sendBuffer.some((packet) => String(packet.id) === id);
if (!isBuffered) {
// note: handlers that do not accept an error as first argument are ignored here
const ack = this.acks[id];
delete this.acks[id];
if (ack.withError) {
ack.call(this, new Error("socket has been disconnected"));
}
}
});
}
/**
* Called with socket packet.
*
* @param packet
* @private
*/
onpacket(packet) {
const sameNamespace = packet.nsp === this.nsp;
if (!sameNamespace)
return;
switch (packet.type) {
case PacketType.CONNECT:
if (packet.data && packet.data.sid) {
this.onconnect(packet.data.sid, packet.data.pid);
}
else {
this.emitReserved("connect_error", new Error("It seems you are trying to reach a Socket.IO server in v2.x with a v3.x client, but they are not compatible (more information here: https://socket.io/docs/v3/migrating-from-2-x-to-3-0/)"));
}
break;
case PacketType.EVENT:
case PacketType.BINARY_EVENT:
this.onevent(packet);
break;
case PacketType.ACK:
case PacketType.BINARY_ACK:
this.onack(packet);
break;
case PacketType.DISCONNECT:
this.ondisconnect();
break;
case PacketType.CONNECT_ERROR:
this.destroy();
const err = new Error(packet.data.message);
// @ts-ignore
err.data = packet.data.data;
this.emitReserved("connect_error", err);
break;
}
}
/**
* Called upon a server event.
*
* @param packet
* @private
*/
onevent(packet) {
const args = packet.data || [];
debug("emitting event %j", args);
if (null != packet.id) {
debug("attaching ack callback to event");
args.push(this.ack(packet.id));
}
if (this.connected) {
this.emitEvent(args);
}
else {
this.receiveBuffer.push(Object.freeze(args));
}
}
emitEvent(args) {
if (this._anyListeners && this._anyListeners.length) {
const listeners = this._anyListeners.slice();
for (const listener of listeners) {
listener.apply(this, args);
}
}
super.emit.apply(this, args);
if (this._pid && args.length && typeof args[args.length - 1] === "string") {
this._lastOffset = args[args.length - 1];
}
}
/**
* Produces an ack callback to emit with an event.
*
* @private
*/
ack(id) {
const self = this;
let sent = false;
return function (...args) {
// prevent double callbacks
if (sent)
return;
sent = true;
debug("sending ack %j", args);
self.packet({
type: PacketType.ACK,
id: id,
data: args,
});
};
}
/**
* Called upon a server acknowledgement.
*
* @param packet
* @private
*/
onack(packet) {
const ack = this.acks[packet.id];
if (typeof ack !== "function") {
debug("bad ack %s", packet.id);
return;
}
delete this.acks[packet.id];
debug("calling ack %s with %j", packet.id, packet.data);
// @ts-ignore FIXME ack is incorrectly inferred as 'never'
if (ack.withError) {
packet.data.unshift(null);
}
// @ts-ignore
ack.apply(this, packet.data);
}
/**
* Called upon server connect.
*
* @private
*/
onconnect(id, pid) {
debug("socket connected with id %s", id);
this.id = id;
this.recovered = pid && this._pid === pid;
this._pid = pid; // defined only if connection state recovery is enabled
this.connected = true;
this.emitBuffered();
this.emitReserved("connect");
this._drainQueue(true);
}
/**
* Emit buffered events (received and emitted).
*
* @private
*/
emitBuffered() {
this.receiveBuffer.forEach((args) => this.emitEvent(args));
this.receiveBuffer = [];
this.sendBuffer.forEach((packet) => {
this.notifyOutgoingListeners(packet);
this.packet(packet);
});
this.sendBuffer = [];
}
/**
* Called upon server disconnect.
*
* @private
*/
ondisconnect() {
debug("server disconnect (%s)", this.nsp);
this.destroy();
this.onclose("io server disconnect");
}
/**
* Called upon forced client/server side disconnections,
* this method ensures the manager stops tracking us and
* that reconnections don't get triggered for this.
*
* @private
*/
destroy() {
if (this.subs) {
// clean subscriptions to avoid reconnections
this.subs.forEach((subDestroy) => subDestroy());
this.subs = undefined;
}
this.io["_destroy"](this);
}
/**
* Disconnects the socket manually. In that case, the socket will not try to reconnect.
*
* If this is the last active Socket instance of the {@link Manager}, the low-level connection will be closed.
*
* @example
* const socket = io();
*
* socket.on("disconnect", (reason) => {
* // console.log(reason); prints "io client disconnect"
* });
*
* socket.disconnect();
*
* @return self
*/
disconnect() {
if (this.connected) {
debug("performing disconnect (%s)", this.nsp);
this.packet({ type: PacketType.DISCONNECT });
}
// remove socket from pool
this.destroy();
if (this.connected) {
// fire events
this.onclose("io client disconnect");
}
return this;
}
/**
* Alias for {@link disconnect()}.
*
* @return self
*/
close() {
return this.disconnect();
}
/**
* Sets the compress flag.
*
* @example
* socket.compress(false).emit("hello");
*
* @param compress - if `true`, compresses the sending data
* @return self
*/
compress(compress) {
this.flags.compress = compress;
return this;
}
/**
* Sets a modifier for a subsequent event emission that the event message will be dropped when this socket is not
* ready to send messages.
*
* @example
* socket.volatile.emit("hello"); // the server may or may not receive it
*
* @returns self
*/
get volatile() {
this.flags.volatile = true;
return this;
}
/**
* Sets a modifier for a subsequent event emission that the callback will be called with an error when the
* given number of milliseconds have elapsed without an acknowledgement from the server:
*
* @example
* socket.timeout(5000).emit("my-event", (err) => {
* if (err) {
* // the server did not acknowledge the event in the given delay
* }
* });
*
* @returns self
*/
timeout(timeout) {
this.flags.timeout = timeout;
return this;
}
/**
* Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
* callback.
*
* @example
* socket.onAny((event, ...args) => {
* console.log(`got ${event}`);
* });
*
* @param listener
*/
onAny(listener) {
this._anyListeners = this._anyListeners || [];
this._anyListeners.push(listener);
return this;
}
/**
* Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
* callback. The listener is added to the beginning of the listeners array.
*
* @example
* socket.prependAny((event, ...args) => {
* console.log(`got event ${event}`);
* });
*
* @param listener
*/
prependAny(listener) {
this._anyListeners = this._anyListeners || [];
this._anyListeners.unshift(listener);
return this;
}
/**
* Removes the listener that will be fired when any event is emitted.
*
* @example
* const catchAllListener = (event, ...args) => {
* console.log(`got event ${event}`);
* }
*
* socket.onAny(catchAllListener);
*
* // remove a specific listener
* socket.offAny(catchAllListener);
*
* // or remove all listeners
* socket.offAny();
*
* @param listener
*/
offAny(listener) {
if (!this._anyListeners) {
return this;
}
if (listener) {
const listeners = this._anyListeners;
for (let i = 0; i < listeners.length; i++) {
if (listener === listeners[i]) {
listeners.splice(i, 1);
return this;
}
}
}
else {
this._anyListeners = [];
}
return this;
}
/**
* Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,
* e.g. to remove listeners.
*/
listenersAny() {
return this._anyListeners || [];
}
/**
* Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
* callback.
*
* Note: acknowledgements sent to the server are not included.
*
* @example
* socket.onAnyOutgoing((event, ...args) => {
* console.log(`sent event ${event}`);
* });
*
* @param listener
*/
onAnyOutgoing(listener) {
this._anyOutgoingListeners = this._anyOutgoingListeners || [];
this._anyOutgoingListeners.push(listener);
return this;
}
/**
* Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
* callback. The listener is added to the beginning of the listeners array.
*
* Note: acknowledgements sent to the server are not included.
*
* @example
* socket.prependAnyOutgoing((event, ...args) => {
* console.log(`sent event ${event}`);
* });
*
* @param listener
*/
prependAnyOutgoing(listener) {
this._anyOutgoingListeners = this._anyOutgoingListeners || [];
this._anyOutgoingListeners.unshift(listener);
return this;
}
/**
* Removes the listener that will be fired when any event is emitted.
*
* @example
* const catchAllListener = (event, ...args) => {
* console.log(`sent event ${event}`);
* }
*
* socket.onAnyOutgoing(catchAllListener);
*
* // remove a specific listener
* socket.offAnyOutgoing(catchAllListener);
*
* // or remove all listeners
* socket.offAnyOutgoing();
*
* @param [listener] - the catch-all listener (optional)
*/
offAnyOutgoing(listener) {
if (!this._anyOutgoingListeners) {
return this;
}
if (listener) {
const listeners = this._anyOutgoingListeners;
for (let i = 0; i < listeners.length; i++) {
if (listener === listeners[i]) {
listeners.splice(i, 1);
return this;
}
}
}
else {
this._anyOutgoingListeners = [];
}
return this;
}
/**
* Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,
* e.g. to remove listeners.
*/
listenersAnyOutgoing() {
return this._anyOutgoingListeners || [];
}
/**
* Notify the listeners for each packet sent
*
* @param packet
*
* @private
*/
notifyOutgoingListeners(packet) {
if (this._anyOutgoingListeners && this._anyOutgoingListeners.length) {
const listeners = this._anyOutgoingListeners.slice();
for (const listener of listeners) {
listener.apply(this, packet.data);
}
}
}
}
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