mirror of
https://github.com/socketio/socket.io.git
synced 2026-04-30 03:00:39 -04:00
871 lines
21 KiB
TypeScript
871 lines
21 KiB
TypeScript
import { Packet, PacketType } from "socket.io-parser";
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import { on } from "./on.js";
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import { Manager } from "./manager.js";
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import {
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DefaultEventsMap,
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EventNames,
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EventParams,
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EventsMap,
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Emitter,
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} from "@socket.io/component-emitter";
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import debugModule from "debug"; // debug()
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const debug = debugModule("socket.io-client:socket"); // debug()
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export interface SocketOptions {
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/**
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* the authentication payload sent when connecting to the Namespace
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*/
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auth: { [key: string]: any } | ((cb: (data: object) => void) => void);
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}
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/**
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* Internal events.
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* These events can't be emitted by the user.
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*/
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const RESERVED_EVENTS = Object.freeze({
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connect: 1,
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connect_error: 1,
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disconnect: 1,
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disconnecting: 1,
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// EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
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newListener: 1,
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removeListener: 1,
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});
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interface Flags {
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compress?: boolean;
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volatile?: boolean;
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timeout?: number;
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}
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export type DisconnectDescription =
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| Error
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| {
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description: string;
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context?: CloseEvent | XMLHttpRequest;
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};
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interface SocketReservedEvents {
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connect: () => void;
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connect_error: (err: Error) => void;
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disconnect: (
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reason: Socket.DisconnectReason,
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description?: DisconnectDescription
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) => void;
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}
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/**
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* A Socket is the fundamental class for interacting with the server.
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*
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* A Socket belongs to a certain Namespace (by default /) and uses an underlying {@link Manager} to communicate.
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*
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* @example
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* const socket = io();
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*
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* socket.on("connect", () => {
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* console.log("connected");
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* });
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*
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* // send an event to the server
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* socket.emit("foo", "bar");
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*
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* socket.on("foobar", () => {
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* // an event was received from the server
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* });
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*
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* // upon disconnection
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* socket.on("disconnect", (reason) => {
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* console.log(`disconnected due to ${reason}`);
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* });
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*/
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export class Socket<
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ListenEvents extends EventsMap = DefaultEventsMap,
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EmitEvents extends EventsMap = ListenEvents
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> extends Emitter<ListenEvents, EmitEvents, SocketReservedEvents> {
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public readonly io: Manager<ListenEvents, EmitEvents>;
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/**
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* A unique identifier for the session.
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*
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* @example
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* const socket = io();
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*
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* console.log(socket.id); // undefined
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*
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* socket.on("connect", () => {
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* console.log(socket.id); // "G5p5..."
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* });
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*/
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public id: string;
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/**
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* Whether the socket is currently connected to the server.
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*
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* @example
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* const socket = io();
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*
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* socket.on("connect", () => {
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* console.log(socket.connected); // true
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* });
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*
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* socket.on("disconnect", () => {
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* console.log(socket.connected); // false
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* });
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*/
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public connected: boolean = false;
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/**
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* Credentials that are sent when accessing a namespace.
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*
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* @example
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* const socket = io({
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* auth: {
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* token: "abcd"
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* }
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* });
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*
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* // or with a function
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* const socket = io({
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* auth: (cb) => {
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* cb({ token: localStorage.token })
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* }
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* });
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*/
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public auth: { [key: string]: any } | ((cb: (data: object) => void) => void);
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/**
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* Buffer for packets received before the CONNECT packet
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*/
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public receiveBuffer: Array<ReadonlyArray<any>> = [];
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/**
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* Buffer for packets that will be sent once the socket is connected
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*/
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public sendBuffer: Array<Packet> = [];
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private readonly nsp: string;
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private ids: number = 0;
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private acks: object = {};
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private flags: Flags = {};
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private subs?: Array<VoidFunction>;
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private _anyListeners: Array<(...args: any[]) => void>;
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private _anyOutgoingListeners: Array<(...args: any[]) => void>;
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/**
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* `Socket` constructor.
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*/
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constructor(io: Manager, nsp: string, opts?: Partial<SocketOptions>) {
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super();
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this.io = io;
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this.nsp = nsp;
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if (opts && opts.auth) {
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this.auth = opts.auth;
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}
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if (this.io._autoConnect) this.open();
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}
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/**
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* Whether the socket is currently disconnected
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*
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* @example
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* const socket = io();
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*
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* socket.on("connect", () => {
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* console.log(socket.disconnected); // false
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* });
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*
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* socket.on("disconnect", () => {
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* console.log(socket.disconnected); // true
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* });
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*/
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public get disconnected(): boolean {
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return !this.connected;
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}
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/**
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* Subscribe to open, close and packet events
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*
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* @private
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*/
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private subEvents(): void {
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if (this.subs) return;
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const io = this.io;
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this.subs = [
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on(io, "open", this.onopen.bind(this)),
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on(io, "packet", this.onpacket.bind(this)),
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on(io, "error", this.onerror.bind(this)),
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on(io, "close", this.onclose.bind(this)),
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];
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}
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/**
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* Whether the Socket will try to reconnect when its Manager connects or reconnects.
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*
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* @example
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* const socket = io();
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*
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* console.log(socket.active); // true
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*
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* socket.on("disconnect", (reason) => {
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* if (reason === "io server disconnect") {
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* // the disconnection was initiated by the server, you need to manually reconnect
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* console.log(socket.active); // false
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* }
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* // else the socket will automatically try to reconnect
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* console.log(socket.active); // true
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* });
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*/
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public get active(): boolean {
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return !!this.subs;
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}
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/**
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* "Opens" the socket.
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*
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* @example
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* const socket = io({
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* autoConnect: false
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* });
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*
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* socket.connect();
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*/
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public connect(): this {
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if (this.connected) return this;
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this.subEvents();
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if (!this.io["_reconnecting"]) this.io.open(); // ensure open
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if ("open" === this.io._readyState) this.onopen();
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return this;
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}
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/**
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* Alias for {@link connect()}.
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*/
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public open(): this {
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return this.connect();
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}
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/**
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* Sends a `message` event.
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*
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* This method mimics the WebSocket.send() method.
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*
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* @see https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/send
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*
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* @example
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* socket.send("hello");
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*
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* // this is equivalent to
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* socket.emit("message", "hello");
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*
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* @return self
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*/
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public send(...args: any[]): this {
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args.unshift("message");
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this.emit.apply(this, args);
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return this;
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}
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/**
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* Override `emit`.
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* If the event is in `events`, it's emitted normally.
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*
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* @example
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* socket.emit("hello", "world");
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*
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* // all serializable datastructures are supported (no need to call JSON.stringify)
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* socket.emit("hello", 1, "2", { 3: ["4"], 5: Uint8Array.from([6]) });
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*
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* // with an acknowledgement from the server
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* socket.emit("hello", "world", (val) => {
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* // ...
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* });
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*
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* @return self
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*/
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public emit<Ev extends EventNames<EmitEvents>>(
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ev: Ev,
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...args: EventParams<EmitEvents, Ev>
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): this {
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if (RESERVED_EVENTS.hasOwnProperty(ev)) {
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throw new Error('"' + ev.toString() + '" is a reserved event name');
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}
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args.unshift(ev);
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const packet: any = {
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type: PacketType.EVENT,
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data: args,
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};
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packet.options = {};
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packet.options.compress = this.flags.compress !== false;
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// event ack callback
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if ("function" === typeof args[args.length - 1]) {
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const id = this.ids++;
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debug("emitting packet with ack id %d", id);
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const ack = args.pop() as Function;
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this._registerAckCallback(id, ack);
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packet.id = id;
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}
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const isTransportWritable =
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this.io.engine &&
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this.io.engine.transport &&
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this.io.engine.transport.writable;
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const discardPacket =
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this.flags.volatile && (!isTransportWritable || !this.connected);
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if (discardPacket) {
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debug("discard packet as the transport is not currently writable");
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} else if (this.connected) {
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this.notifyOutgoingListeners(packet);
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this.packet(packet);
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} else {
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this.sendBuffer.push(packet);
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}
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this.flags = {};
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return this;
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}
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/**
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* @private
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*/
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private _registerAckCallback(id: number, ack: Function) {
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const timeout = this.flags.timeout;
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if (timeout === undefined) {
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this.acks[id] = ack;
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return;
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}
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// @ts-ignore
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const timer = this.io.setTimeoutFn(() => {
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delete this.acks[id];
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for (let i = 0; i < this.sendBuffer.length; i++) {
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if (this.sendBuffer[i].id === id) {
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debug("removing packet with ack id %d from the buffer", id);
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this.sendBuffer.splice(i, 1);
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}
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}
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debug("event with ack id %d has timed out after %d ms", id, timeout);
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ack.call(this, new Error("operation has timed out"));
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}, timeout);
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this.acks[id] = (...args) => {
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// @ts-ignore
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this.io.clearTimeoutFn(timer);
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ack.apply(this, [null, ...args]);
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};
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}
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/**
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* Sends a packet.
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*
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* @param packet
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* @private
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*/
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private packet(packet: Partial<Packet>): void {
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packet.nsp = this.nsp;
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this.io._packet(packet);
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}
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/**
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* Called upon engine `open`.
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*
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* @private
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*/
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private onopen(): void {
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debug("transport is open - connecting");
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if (typeof this.auth == "function") {
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this.auth((data) => {
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this.packet({ type: PacketType.CONNECT, data });
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});
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} else {
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this.packet({ type: PacketType.CONNECT, data: this.auth });
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}
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}
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/**
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* Called upon engine or manager `error`.
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*
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* @param err
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* @private
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*/
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private onerror(err: Error): void {
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if (!this.connected) {
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this.emitReserved("connect_error", err);
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}
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}
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/**
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* Called upon engine `close`.
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*
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* @param reason
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* @param description
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* @private
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*/
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private onclose(
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reason: Socket.DisconnectReason,
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description?: DisconnectDescription
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): void {
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debug("close (%s)", reason);
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this.connected = false;
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delete this.id;
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this.emitReserved("disconnect", reason, description);
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}
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/**
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* Called with socket packet.
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*
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* @param packet
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* @private
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*/
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private onpacket(packet: Packet): void {
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const sameNamespace = packet.nsp === this.nsp;
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if (!sameNamespace) return;
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switch (packet.type) {
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case PacketType.CONNECT:
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if (packet.data && packet.data.sid) {
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const id = packet.data.sid;
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this.onconnect(id);
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} else {
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this.emitReserved(
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"connect_error",
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new Error(
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"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/)"
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)
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);
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}
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break;
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case PacketType.EVENT:
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case PacketType.BINARY_EVENT:
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this.onevent(packet);
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break;
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case PacketType.ACK:
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case PacketType.BINARY_ACK:
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this.onack(packet);
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break;
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case PacketType.DISCONNECT:
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this.ondisconnect();
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break;
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case PacketType.CONNECT_ERROR:
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this.destroy();
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const err = new Error(packet.data.message);
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// @ts-ignore
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err.data = packet.data.data;
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this.emitReserved("connect_error", err);
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break;
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}
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}
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/**
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* Called upon a server event.
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*
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* @param packet
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* @private
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*/
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private onevent(packet: Packet): void {
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const args: Array<any> = packet.data || [];
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debug("emitting event %j", args);
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if (null != packet.id) {
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debug("attaching ack callback to event");
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args.push(this.ack(packet.id));
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}
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if (this.connected) {
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this.emitEvent(args);
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} else {
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this.receiveBuffer.push(Object.freeze(args));
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}
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}
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private emitEvent(args: ReadonlyArray<any>): void {
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if (this._anyListeners && this._anyListeners.length) {
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const listeners = this._anyListeners.slice();
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for (const listener of listeners) {
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listener.apply(this, args);
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}
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}
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super.emit.apply(this, args);
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}
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/**
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* Produces an ack callback to emit with an event.
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*
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* @private
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*/
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private ack(id: number): (...args: any[]) => void {
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const self = this;
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let sent = false;
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return function (...args: any[]) {
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// prevent double callbacks
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if (sent) return;
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sent = true;
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debug("sending ack %j", args);
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self.packet({
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type: PacketType.ACK,
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id: id,
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data: args,
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});
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};
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}
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/**
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* Called upon a server acknowlegement.
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*
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* @param packet
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* @private
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*/
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private onack(packet: Packet): void {
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const ack = this.acks[packet.id];
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if ("function" === typeof ack) {
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debug("calling ack %s with %j", packet.id, packet.data);
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ack.apply(this, packet.data);
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delete this.acks[packet.id];
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} else {
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debug("bad ack %s", packet.id);
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}
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}
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/**
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* Called upon server connect.
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*
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* @private
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*/
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private onconnect(id: string): void {
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debug("socket connected with id %s", id);
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this.id = id;
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this.connected = true;
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this.emitBuffered();
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this.emitReserved("connect");
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}
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/**
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* Emit buffered events (received and emitted).
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*
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* @private
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*/
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private emitBuffered(): void {
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this.receiveBuffer.forEach((args) => this.emitEvent(args));
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this.receiveBuffer = [];
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this.sendBuffer.forEach((packet) => {
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this.notifyOutgoingListeners(packet);
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this.packet(packet);
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});
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this.sendBuffer = [];
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}
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/**
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* Called upon server disconnect.
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*
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* @private
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*/
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private ondisconnect(): void {
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debug("server disconnect (%s)", this.nsp);
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this.destroy();
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this.onclose("io server disconnect");
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}
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/**
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* Called upon forced client/server side disconnections,
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* this method ensures the manager stops tracking us and
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* that reconnections don't get triggered for this.
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*
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* @private
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*/
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private destroy(): void {
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if (this.subs) {
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// clean subscriptions to avoid reconnections
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this.subs.forEach((subDestroy) => subDestroy());
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this.subs = undefined;
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}
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this.io["_destroy"](this);
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}
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/**
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* Disconnects the socket manually. In that case, the socket will not try to reconnect.
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*
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|
* 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
|
|
*/
|
|
public disconnect(): this {
|
|
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
|
|
*/
|
|
public close(): this {
|
|
return this.disconnect();
|
|
}
|
|
|
|
/**
|
|
* Sets the compress flag.
|
|
*
|
|
* @example
|
|
* socket.compress(false).emit("hello");
|
|
*
|
|
* @param compress - if `true`, compresses the sending data
|
|
* @return self
|
|
*/
|
|
public compress(compress: boolean): this {
|
|
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
|
|
*/
|
|
public get volatile(): this {
|
|
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
|
|
*/
|
|
public timeout(timeout: number): this {
|
|
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
|
|
*/
|
|
public onAny(listener: (...args: any[]) => void): this {
|
|
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
|
|
*/
|
|
public prependAny(listener: (...args: any[]) => void): this {
|
|
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
|
|
*/
|
|
public offAny(listener?: (...args: any[]) => void): this {
|
|
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 || [];
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
public onAnyOutgoing(listener: (...args: any[]) => void): this {
|
|
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
|
|
*/
|
|
public prependAnyOutgoing(listener: (...args: any[]) => void): this {
|
|
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)
|
|
*/
|
|
public offAnyOutgoing(listener?: (...args: any[]) => void): this {
|
|
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.
|
|
*/
|
|
public listenersAnyOutgoing() {
|
|
return this._anyOutgoingListeners || [];
|
|
}
|
|
|
|
/**
|
|
* Notify the listeners for each packet sent
|
|
*
|
|
* @param packet
|
|
*
|
|
* @private
|
|
*/
|
|
private notifyOutgoingListeners(packet: Packet) {
|
|
if (this._anyOutgoingListeners && this._anyOutgoingListeners.length) {
|
|
const listeners = this._anyOutgoingListeners.slice();
|
|
for (const listener of listeners) {
|
|
listener.apply(this, packet.data);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
export namespace Socket {
|
|
export type DisconnectReason =
|
|
| "io server disconnect"
|
|
| "io client disconnect"
|
|
| "ping timeout"
|
|
| "transport close"
|
|
| "transport error"
|
|
| "parse error";
|
|
}
|