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Viewing file:     socket.js (13.42 KB)      -rwxrwxr-x

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,
});
export class Socket extends Emitter {
    /**
     * `Socket` constructor.
     *
     * @public
     */
    constructor(io, nsp, opts) {
        super();
        this.connected = false;
        this.disconnected = true;
        this.receiveBuffer = [];
        this.sendBuffer = [];
        this.ids = 0;
        this.acks = {};
        this.flags = {};
        this.io = io;
        this.nsp = nsp;
        if (opts && opts.auth) {
            this.auth = opts.auth;
        }
        if (this.io._autoConnect)
            this.open();
    }
    /**
     * 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
     */
    get active() {
        return !!this.subs;
    }
    /**
     * "Opens" the socket.
     *
     * @public
     */
    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 connect()
     */
    open() {
        return this.connect();
    }
    /**
     * Sends a `message` event.
     *
     * @return self
     * @public
     */
    send(...args) {
        args.unshift("message");
        this.emit.apply(this, args);
        return this;
    }
    /**
     * Override `emit`.
     * If the event is in `events`, it's emitted normally.
     *
     * @return self
     * @public
     */
    emit(ev, ...args) {
        if (RESERVED_EVENTS.hasOwnProperty(ev)) {
            throw new Error('"' + ev + '" is a reserved event name');
        }
        args.unshift(ev);
        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.packet(packet);
        }
        else {
            this.sendBuffer.push(packet);
        }
        this.flags = {};
        return this;
    }
    /**
     * @private
     */
    _registerAckCallback(id, ack) {
        const timeout = this.flags.timeout;
        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);
        this.acks[id] = (...args) => {
            // @ts-ignore
            this.io.clearTimeoutFn(timer);
            ack.apply(this, [null, ...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.packet({ type: PacketType.CONNECT, data });
            });
        }
        else {
            this.packet({ type: PacketType.CONNECT, data: this.auth });
        }
    }
    /**
     * 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
     * @private
     */
    onclose(reason) {
        debug("close (%s)", reason);
        this.connected = false;
        this.disconnected = true;
        delete this.id;
        this.emitReserved("disconnect", reason);
    }
    /**
     * 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) {
                    const id = packet.data.sid;
                    this.onconnect(id);
                }
                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:
                this.onevent(packet);
                break;
            case PacketType.BINARY_EVENT:
                this.onevent(packet);
                break;
            case PacketType.ACK:
                this.onack(packet);
                break;
            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);
    }
    /**
     * 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 acknowlegement.
     *
     * @param packet
     * @private
     */
    onack(packet) {
        const ack = this.acks[packet.id];
        if ("function" === typeof ack) {
            debug("calling ack %s with %j", packet.id, packet.data);
            ack.apply(this, packet.data);
            delete this.acks[packet.id];
        }
        else {
            debug("bad ack %s", packet.id);
        }
    }
    /**
     * Called upon server connect.
     *
     * @private
     */
    onconnect(id) {
        debug("socket connected with id %s", id);
        this.id = id;
        this.connected = true;
        this.disconnected = false;
        this.emitBuffered();
        this.emitReserved("connect");
    }
    /**
     * Emit buffered events (received and emitted).
     *
     * @private
     */
    emitBuffered() {
        this.receiveBuffer.forEach((args) => this.emitEvent(args));
        this.receiveBuffer = [];
        this.sendBuffer.forEach((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.
     *
     * @return self
     * @public
     */
    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 disconnect()
     *
     * @return self
     * @public
     */
    close() {
        return this.disconnect();
    }
    /**
     * Sets the compress flag.
     *
     * @param compress - if `true`, compresses the sending data
     * @return self
     * @public
     */
    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.
     *
     * @returns self
     * @public
     */
    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:
     *
     * ```
     * socket.timeout(5000).emit("my-event", (err) => {
     *   if (err) {
     *     // the server did not acknowledge the event in the given delay
     *   }
     * });
     * ```
     *
     * @returns self
     * @public
     */
    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.
     *
     * @param listener
     * @public
     */
    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.
     *
     * @param listener
     * @public
     */
    prependAny(listener) {
        this._anyListeners = this._anyListeners || [];
        this._anyListeners.unshift(listener);
        return this;
    }
    /**
     * Removes the listener that will be fired when any event is emitted.
     *
     * @param listener
     * @public
     */
    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.
     *
     * @public
     */
    listenersAny() {
        return this._anyListeners || [];
    }
}