codelabs.y-socket.io/dist/index.mjs.map

Socket IO Connector for Yjs (Inspired by y-websocket)

{"version":3,"sources":["../src/client/provider.ts"],"sourcesContent":["import * as Y from 'yjs'\r\nimport * as bc from 'lib0/broadcastchannel'\r\nimport * as AwarenessProtocol from 'y-protocols/awareness'\r\nimport { Observable } from 'lib0/observable'\r\nimport { io, Socket } from 'socket.io-client'\r\nimport { AwarenessChange } from '../types'\r\n\r\n/**\r\n * SocketIOProvider instance configuration. Here you can configure:\r\n * - autoConnect: (Optional) Will try to connect to the server when the instance is created if true; otherwise you have to call `provider.connect()` manually\r\n * - awareness: (Optional) Give an existing awareness\r\n * - resyncInterval: (Optional) Specify the number of milliseconds to set an interval to synchronize the document,\r\n *   if it is greater than 0 enable the synchronization interval (by default is -1)\r\n * - disableBc: (Optional) This boolean disable the broadcast channel functionality, by default is false (broadcast channel enabled)\r\n * - onConnect: (Optional) Set a callback that will triggered immediately when the socket is connected\r\n * - onDisconnect: (Optional) Set a callback that will triggered immediately when the socket is disconnected\r\n * - onConnectError: (Optional) Set a callback that will triggered immediately when the occurs a socket connection error\r\n */\r\nexport interface ProviderConfiguration {\r\n  /**\r\n   * (Optional) This boolean specify if the provider should connect when the instance is created, by default is true\r\n   */\r\n  autoConnect?: boolean\r\n  /**\r\n   * (Optional) An existent awareness, by default is a new AwarenessProtocol.Awareness instance\r\n   */\r\n  awareness?: AwarenessProtocol.Awareness\r\n  /**\r\n   * (optional) Specify the number of milliseconds to synchronize, by default is -1 (this disable resync interval)\r\n   */\r\n  resyncInterval?: number\r\n  /**\r\n   * (Optional) This boolean disable the broadcast channel functionality, by default is false (broadcast channel enabled)\r\n   */\r\n  disableBc?: boolean\r\n  /**\r\n   * (Optional) Add the authentication data\r\n   */\r\n  auth?: { [key: string]: any }\r\n  /**\r\n   * (Optional) Set the socket.io parser\r\n   * @see https://socket.io/docs/v4/server-initialization/#parser\r\n   */\r\n  parser?: any\r\n}\r\n\r\n/**\r\n * The socket io provider class to sync a document\r\n */\r\nexport class SocketIOProvider extends Observable<string> {\r\n  /**\r\n   * The connection url to server. Example: `ws://localhost:3001`\r\n   * @type {string}\r\n   */\r\n  private readonly _url: string\r\n  /**\r\n   * The name of the document room\r\n   * @type {string}\r\n   */\r\n  public roomName: string\r\n  /**\r\n   * The broadcast channel room\r\n   * @type {string}\r\n   * @private\r\n   */\r\n  private readonly _broadcastChannel: string\r\n  /**\r\n   * The socket connection\r\n   * @type {Socket}\r\n   */\r\n  public socket: Socket\r\n  /**\r\n   * The yjs document\r\n   * @type {Y.Doc}\r\n   */\r\n  public doc: Y.Doc\r\n  /**\r\n   * The awareness\r\n   * @type {AwarenessProtocol.Awareness}\r\n   */\r\n  public awareness: AwarenessProtocol.Awareness\r\n  /**\r\n   * Disable broadcast channel, by default is false\r\n   * @type {boolean}\r\n   */\r\n  public disableBc: boolean\r\n  /**\r\n   * The broadcast channel connection status indicator\r\n   * @type {boolean}\r\n   */\r\n  public bcconnected: boolean = false\r\n  /**\r\n   * The document's sync status indicator\r\n   * @type {boolean}\r\n   * @private\r\n   */\r\n  private _synced: boolean = false\r\n  /**\r\n   * Interval to emit `sync-step-1` to sync changes\r\n   * @type {NodeJS.Timer | null}\r\n   * @private\r\n   */\r\n  private resyncInterval: NodeJS.Timer | null = null\r\n\r\n  /**\r\n   * SocketIOProvider constructor\r\n   * @constructor\r\n   * @param {string} url The connection url from server\r\n   * @param {string} roomName The document's room name\r\n   * @param {Y.Doc} doc The yjs document\r\n   * @param {ProviderConfiguration} options Configuration options to the SocketIOProvider\r\n   */\r\n  constructor (url: string, roomName: string, doc: Y.Doc = new Y.Doc(), {\r\n    autoConnect = true,\r\n    awareness = new AwarenessProtocol.Awareness(doc),\r\n    resyncInterval = -1,\r\n    disableBc = false,\r\n    auth = {},\r\n    parser = null\r\n  }: ProviderConfiguration) {\r\n    super()\r\n    while (url[url.length - 1] === '/') {\r\n      url = url.slice(0, url.length - 1)\r\n    }\r\n    this._url = url\r\n    this.roomName = roomName\r\n    this.doc = doc\r\n    this.awareness = awareness\r\n\r\n    this._broadcastChannel = `${url}/${roomName}`\r\n    this.disableBc = disableBc\r\n\r\n    this.socket = io(`${this.url}/yjs|${roomName}`, {\r\n      autoConnect: false,\r\n      transports: ['websocket'],\r\n      forceNew: true,\r\n      auth: auth,\r\n      parser: parser\r\n    })\r\n\r\n    this.doc.on('update', this.onUpdateDoc)\r\n\r\n    this.socket.on('connect', () => this.onSocketConnection(resyncInterval))\r\n\r\n    this.socket.on('disconnect', (event) => this.onSocketDisconnection(event))\r\n\r\n    this.socket.on('connect_error', (error) => this.onSocketConnectionError(error))\r\n\r\n    this.initSyncListeners()\r\n\r\n    this.initAwarenessListeners()\r\n\r\n    this.initSystemListeners()\r\n\r\n    awareness.on('update', this.awarenessUpdate)\r\n\r\n    if (autoConnect) this.connect()\r\n  }\r\n\r\n  /**\r\n   * Broadcast channel room getter\r\n   * @type {string}\r\n   */\r\n  public get broadcastChannel (): string {\r\n    return this._broadcastChannel\r\n  }\r\n\r\n  /**\r\n   * URL getter\r\n   * @type {string}\r\n   */\r\n  public get url (): string {\r\n    return this._url\r\n  }\r\n\r\n  /**\r\n   * Synchronized state flag getter\r\n   * @type {boolean}\r\n   */\r\n  public get synced (): boolean {\r\n    return this._synced\r\n  }\r\n\r\n  /**\r\n   * Synchronized state flag setter\r\n   */\r\n  public set synced (state) {\r\n    if (this._synced !== state) {\r\n      this._synced = state\r\n      this.emit('synced', [state])\r\n      this.emit('sync', [state])\r\n    }\r\n  }\r\n\r\n  /**\r\n   * This function initializes the socket event listeners to synchronize document changes.\r\n   *\r\n   *  The synchronization protocol is as follows:\r\n   *  - A server emits the sync step one event (`sync-step-1`) which sends the document as a state vector\r\n   *    and the sync step two callback as an acknowledgment according to the socket io acknowledgments.\r\n   *  - When the client receives the `sync-step-1` event, it executes the `syncStep2` acknowledgment callback and sends\r\n   *    the difference between the received state vector and the local document (this difference is called an update).\r\n   *  - The second step of the sync is to apply the update sent in the `syncStep2` callback parameters from the client\r\n   *    to the document on the server side.\r\n   *  - There is another event (`sync-update`) that is emitted from the server, which sends an update for the document,\r\n   *    and when the client receives this event, it applies the received update to the local document.\r\n   *  - When an update is applied to a document, it will fire the document's \"update\" event, which\r\n   *    sends the update to the server.\r\n   * @type {() => void}\r\n   * @private\r\n   */\r\n  private readonly initSyncListeners = (): void => {\r\n    this.socket.on('sync-step-1', (stateVector: ArrayBuffer, syncStep2: (update: Uint8Array) => void) => {\r\n      syncStep2(Y.encodeStateAsUpdate(this.doc, new Uint8Array(stateVector)))\r\n      this.synced = true\r\n    })\r\n\r\n    this.socket.on('sync-update', this.onSocketSyncUpdate)\r\n  }\r\n\r\n  /**\r\n   * This function initializes socket event listeners to synchronize awareness changes.\r\n   *\r\n   *  The awareness protocol is as follows:\r\n   *  - The server emits the `awareness-update` event by sending the awareness update.\r\n   *  - The client receives that event and applies the received update to the local awareness.\r\n   *  - When an update is applied to awareness, the awareness \"update\" event will fire, which\r\n   *    sends the update to the server.\r\n   * @type {() => void}\r\n   * @private\r\n   */\r\n  private readonly initAwarenessListeners = (): void => {\r\n    this.socket.on('awareness-update', (update: ArrayBuffer) => {\r\n      AwarenessProtocol.applyAwarenessUpdate(this.awareness, new Uint8Array(update), this)\r\n    })\r\n  }\r\n\r\n  /**\r\n   * This function initialize the window or process events listener. Specifically set ups the\r\n   * window `beforeunload` and process `exit` events to remove the client from the awareness.\r\n   * @type {() => void}\r\n   */\r\n  private readonly initSystemListeners = (): void => {\r\n    if (typeof window !== 'undefined') window.addEventListener('beforeunload', this.beforeUnloadHandler)\r\n    else if (typeof process !== 'undefined') process.on('exit', this.beforeUnloadHandler)\r\n  }\r\n\r\n  /**\r\n   * Connect provider's socket\r\n   * @type {() => void}\r\n   */\r\n  public connect (): void {\r\n    if (!this.socket.connected) {\r\n      this.emit('status', [{ status: 'connecting' }])\r\n      this.socket.connect()\r\n      if (!this.disableBc) this.connectBc()\r\n      this.synced = false\r\n    }\r\n  }\r\n\r\n  /**\r\n   * This function runs when the socket connects and reconnects and emits the `sync-step-1`\r\n   * and `awareness-update` socket events to start synchronization.\r\n   *\r\n   *  Also starts the resync interval if is enabled.\r\n   * @private\r\n   * @param {() => void | Promise<void>} onConnect (Optional) A callback that will be triggered every time that socket is connected or reconnected\r\n   * @param {number} resyncInterval (Optional) A number of milliseconds for interval of synchronize\r\n   * @type {(onConnect: () => void | Promise<void>, resyncInterval: number = -1) => void}\r\n   */\r\n  private readonly onSocketConnection = (resyncInterval: ProviderConfiguration['resyncInterval'] = -1): void => {\r\n    this.emit('status', [{ status: 'connected' }])\r\n    this.socket.emit('sync-step-1', Y.encodeStateVector(this.doc), (update: Uint8Array) => {\r\n      Y.applyUpdate(this.doc, new Uint8Array(update), this)\r\n    })\r\n    if (this.awareness.getLocalState() !== null) this.socket.emit('awareness-update', AwarenessProtocol.encodeAwarenessUpdate(this.awareness, [this.doc.clientID]))\r\n    if (resyncInterval > 0) {\r\n      this.resyncInterval = setInterval(() => {\r\n        if (this.socket.disconnected) return\r\n        this.socket.emit('sync-step-1', Y.encodeStateVector(this.doc), (update: Uint8Array) => {\r\n          Y.applyUpdate(this.doc, new Uint8Array(update), this)\r\n        })\r\n      }, resyncInterval)\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Disconnect provider's socket\r\n   * @type {() => void}\r\n   */\r\n  public disconnect (): void {\r\n    if (this.socket.connected) {\r\n      this.disconnectBc()\r\n      this.socket.disconnect()\r\n    }\r\n  }\r\n\r\n  /**\r\n   * This function runs when the socket is disconnected and emits the socket event `awareness-update`\r\n   * which removes this client from awareness.\r\n   * @private\r\n   * @param {Socket.DisconnectReason} event The reason of the socket disconnection\r\n   * @param {() => void | Promise<void>} onDisconnect (Optional) A callback that will be triggered every time that socket is disconnected\r\n   * @type {(event: Socket.DisconnectReason, onDisconnect: () => void | Promise<void>) => void}\r\n   */\r\n  private readonly onSocketDisconnection = (event: Socket.DisconnectReason): void => {\r\n    this.emit('connection-close', [event, this])\r\n    this.synced = false\r\n    AwarenessProtocol.removeAwarenessStates(this.awareness, Array.from(this.awareness.getStates().keys()).filter(client => client !== this.doc.clientID), this)\r\n    this.emit('status', [{ status: 'disconnected' }])\r\n  }\r\n\r\n  /**\r\n   * This function is executed when the socket connection fails.\r\n   * @param {Error} error The error in the connection\r\n   * @param {(error: Error) => void | Promise<void>} onConnectError (Optional) A callback that will be triggered every time that socket has a connection error\r\n   * @type {(error: Error, onConnectError: (error: Error) => void | Promise<void>) => void}\r\n   */\r\n  private readonly onSocketConnectionError = (error: Error): void => {\r\n    this.emit('connection-error', [error, this])\r\n  }\r\n\r\n  /**\r\n   * Destroy the provider. This method clears the document, awareness, and window/process listeners and disconnects the socket.\r\n   * @type {() => void}\r\n   */\r\n  public destroy (): void {\r\n    if (this.resyncInterval != null) clearInterval(this.resyncInterval)\r\n    this.disconnect()\r\n    if (typeof window !== 'undefined') window.removeEventListener('beforeunload', this.beforeUnloadHandler)\r\n    else if (typeof process !== 'undefined') process.off('exit', this.beforeUnloadHandler)\r\n    this.awareness.off('update', this.awarenessUpdate)\r\n    this.doc.off('update', this.onUpdateDoc)\r\n    super.destroy()\r\n  }\r\n\r\n  /**\r\n   * This function is executed when the document is updated, if the instance that\r\n   * emit the change is not this, it emit the changes by socket and broadcast channel.\r\n   * @private\r\n   * @param {Uint8Array} update Document update\r\n   * @param {SocketIOProvider} origin The SocketIOProvider instance that emits the change.\r\n   * @type {(update: Uint8Array, origin: SocketIOProvider) => void}\r\n   */\r\n  private readonly onUpdateDoc = (update: Uint8Array, origin: SocketIOProvider): void => {\r\n    if (origin !== this) {\r\n      this.socket.emit('sync-update', update)\r\n      if (this.bcconnected) {\r\n        bc.publish(this._broadcastChannel, {\r\n          type: 'sync-update',\r\n          data: update\r\n        }, this)\r\n      }\r\n    }\r\n  }\r\n\r\n  /**\r\n   * This function is called when the server emits the `sync-update` event and applies the received update to the local document.\r\n   * @private\r\n   * @param {Uint8Array}update A document update received by the `sync-update` socket event\r\n   * @type {(update: Uint8Array) => void}\r\n   */\r\n  private readonly onSocketSyncUpdate = (update: ArrayBuffer): void => {\r\n    Y.applyUpdate(this.doc, new Uint8Array(update), this)\r\n  }\r\n\r\n  /**\r\n   * This function is executed when the local awareness changes and this broadcasts the changes per socket and broadcast channel.\r\n   * @private\r\n   * @param {{ added: number[], updated: number[], removed: number[] }} awarenessChanges The clients added, updated and removed\r\n   * @param {SocketIOProvider | null} origin The SocketIOProvider instance that emits the change.\r\n   * @type {({ added, updated, removed }: { added: number[], updated: number[], removed: number[] }, origin: SocketIOProvider | null) => void}\r\n   */\r\n  private readonly awarenessUpdate = ({ added, updated, removed }: AwarenessChange, origin: SocketIOProvider | null): void => {\r\n    const changedClients = added.concat(updated).concat(removed)\r\n    this.socket.emit('awareness-update', AwarenessProtocol.encodeAwarenessUpdate(this.awareness, changedClients))\r\n    if (this.bcconnected) {\r\n      bc.publish(this._broadcastChannel, {\r\n        type: 'awareness-update',\r\n        data: AwarenessProtocol.encodeAwarenessUpdate(this.awareness, changedClients)\r\n      }, this)\r\n    }\r\n  }\r\n\r\n  /**\r\n   * This function is executed when the windows will be unloaded or the process will be closed and this\r\n   * will remove the local client from awareness.\r\n   * @private\r\n   * @type {() => void}\r\n   */\r\n  private readonly beforeUnloadHandler = (): void => {\r\n    AwarenessProtocol.removeAwarenessStates(this.awareness, [this.doc.clientID], 'window unload')\r\n  }\r\n\r\n  /**\r\n   * This function subscribes the provider to the broadcast channel and initiates synchronization by broadcast channel.\r\n   * @type {() => void}\r\n   */\r\n  private readonly connectBc = (): void => {\r\n    if (!this.bcconnected) {\r\n      bc.subscribe(this._broadcastChannel, this.onBroadcastChannelMessage)\r\n      this.bcconnected = true\r\n    }\r\n    bc.publish(this._broadcastChannel, { type: 'sync-step-1', data: Y.encodeStateVector(this.doc) }, this)\r\n    bc.publish(this._broadcastChannel, { type: 'sync-step-2', data: Y.encodeStateAsUpdate(this.doc) }, this)\r\n    bc.publish(this._broadcastChannel, { type: 'query-awareness', data: null }, this)\r\n    bc.publish(this._broadcastChannel, { type: 'awareness-update', data: AwarenessProtocol.encodeAwarenessUpdate(this.awareness, [this.doc.clientID]) }, this)\r\n  }\r\n\r\n  /**\r\n   * This function unsubscribes the provider from the broadcast channel and before unsubscribing, updates the awareness.\r\n   * @type {() => void}\r\n   */\r\n  private readonly disconnectBc = (): void => {\r\n    bc.publish(this._broadcastChannel, {\r\n      type: 'awareness-update',\r\n      data: AwarenessProtocol.encodeAwarenessUpdate(this.awareness, [this.doc.clientID], new Map())\r\n    }, this)\r\n    if (this.bcconnected) {\r\n      bc.unsubscribe(this._broadcastChannel, this.onBroadcastChannelMessage)\r\n      this.bcconnected = false\r\n    }\r\n  }\r\n\r\n  /**\r\n   * This method handles messages received by the broadcast channel and responds to them.\r\n   * @param {{ type: string, data: any }} message The object message received by broadcast channel\r\n   * @param {SocketIOProvider} origin The SocketIOProvider instance that emits the change\r\n   * @type {(message: { type: string, data: any }, origin: SocketIOProvider) => void}\r\n   */\r\n  private readonly onBroadcastChannelMessage = (message: { type: string, data: any }, origin: SocketIOProvider): void => {\r\n    if (origin !== this && message.type.length > 0) {\r\n      switch (message.type) {\r\n        case 'sync-step-1':\r\n          bc.publish(this._broadcastChannel, {\r\n            type: 'sync-step-2',\r\n            data: Y.encodeStateAsUpdate(this.doc, message.data)\r\n          }, this)\r\n          break\r\n\r\n        case 'sync-step-2':\r\n          Y.applyUpdate(this.doc, new Uint8Array(message.data), this)\r\n          break\r\n\r\n        case 'sync-update':\r\n          Y.applyUpdate(this.doc, new Uint8Array(message.data), this)\r\n          break\r\n\r\n        case 'query-awareness':\r\n          bc.publish(this._broadcastChannel, {\r\n            type: 'awareness-update',\r\n            data: AwarenessProtocol.encodeAwarenessUpdate(this.awareness, Array.from(this.awareness.getStates().keys()))\r\n          }, this)\r\n          break\r\n\r\n        case 'awareness-update':\r\n          AwarenessProtocol.applyAwarenessUpdate(this.awareness, new Uint8Array(message.data), this)\r\n          break\r\n\r\n        default:\r\n          break\r\n      }\r\n    }\r\n  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