y-websocket/dist/y-websocket.cjs.map

Websockets provider for Yjs

{"version":3,"file":"y-websocket.cjs","sources":["../src/y-websocket.js"],"sourcesContent":["/**\n * @module provider/websocket\n */\n\n/* eslint-env browser */\n\nimport * as Y from 'yjs' // eslint-disable-line\nimport * as bc from 'lib0/broadcastchannel'\nimport * as time from 'lib0/time'\nimport * as encoding from 'lib0/encoding'\nimport * as decoding from 'lib0/decoding'\nimport * as syncProtocol from 'y-protocols/sync'\nimport * as authProtocol from 'y-protocols/auth'\nimport * as awarenessProtocol from 'y-protocols/awareness'\nimport { ObservableV2 } from 'lib0/observable'\nimport * as math from 'lib0/math'\nimport * as url from 'lib0/url'\nimport * as env from 'lib0/environment'\n\nexport const messageSync = 0\nexport const messageQueryAwareness = 3\nexport const messageAwareness = 1\nexport const messageAuth = 2\n\n/**\n *                       encoder,          decoder,          provider,          emitSynced, messageType\n * @type {Array<function(encoding.Encoder, decoding.Decoder, WebsocketProvider, boolean,    number):void>}\n */\nconst messageHandlers = []\n\nmessageHandlers[messageSync] = (\n  encoder,\n  decoder,\n  provider,\n  emitSynced,\n  _messageType\n) => {\n  encoding.writeVarUint(encoder, messageSync)\n  const syncMessageType = syncProtocol.readSyncMessage(\n    decoder,\n    encoder,\n    provider.doc,\n    provider\n  )\n  if (\n    emitSynced && syncMessageType === syncProtocol.messageYjsSyncStep2 &&\n    !provider.synced\n  ) {\n    provider.synced = true\n  }\n}\n\nmessageHandlers[messageQueryAwareness] = (\n  encoder,\n  _decoder,\n  provider,\n  _emitSynced,\n  _messageType\n) => {\n  encoding.writeVarUint(encoder, messageAwareness)\n  encoding.writeVarUint8Array(\n    encoder,\n    awarenessProtocol.encodeAwarenessUpdate(\n      provider.awareness,\n      Array.from(provider.awareness.getStates().keys())\n    )\n  )\n}\n\nmessageHandlers[messageAwareness] = (\n  _encoder,\n  decoder,\n  provider,\n  _emitSynced,\n  _messageType\n) => {\n  awarenessProtocol.applyAwarenessUpdate(\n    provider.awareness,\n    decoding.readVarUint8Array(decoder),\n    provider\n  )\n}\n\nmessageHandlers[messageAuth] = (\n  _encoder,\n  decoder,\n  provider,\n  _emitSynced,\n  _messageType\n) => {\n  authProtocol.readAuthMessage(\n    decoder,\n    provider.doc,\n    (_ydoc, reason) => permissionDeniedHandler(provider, reason)\n  )\n}\n\n// @todo - this should depend on awareness.outdatedTime\nconst messageReconnectTimeout = 30000\n\n/**\n * @param {WebsocketProvider} provider\n * @param {string} reason\n */\nconst permissionDeniedHandler = (provider, reason) =>\n  console.warn(`Permission denied to access ${provider.url}.\\n${reason}`)\n\n/**\n * @param {WebsocketProvider} provider\n * @param {Uint8Array} buf\n * @param {boolean} emitSynced\n * @return {encoding.Encoder}\n */\nconst readMessage = (provider, buf, emitSynced) => {\n  const decoder = decoding.createDecoder(buf)\n  const encoder = encoding.createEncoder()\n  const messageType = decoding.readVarUint(decoder)\n  const messageHandler = provider.messageHandlers[messageType]\n  if (/** @type {any} */ (messageHandler)) {\n    messageHandler(encoder, decoder, provider, emitSynced, messageType)\n  } else {\n    console.error('Unable to compute message')\n  }\n  return encoder\n}\n\n/**\n * Outsource this function so that a new websocket connection is created immediately.\n * I suspect that the `ws.onclose` event is not always fired if there are network issues.\n *\n * @param {WebsocketProvider} provider\n * @param {WebSocket} ws\n * @param {CloseEvent | null} event\n */\nconst closeWebsocketConnection = (provider, ws, event) => {\n  if (ws === provider.ws) {\n    provider.emit('connection-close', [event, provider])\n    provider.ws = null\n    ws.close()\n    provider.wsconnecting = false\n    if (provider.wsconnected) {\n      provider.wsconnected = false\n      provider.synced = false\n      // update awareness (all users except local left)\n      awarenessProtocol.removeAwarenessStates(\n        provider.awareness,\n        Array.from(provider.awareness.getStates().keys()).filter((client) =>\n          client !== provider.doc.clientID\n        ),\n        provider\n      )\n      provider.emit('status', [{\n        status: 'disconnected'\n      }])\n    } else {\n      provider.wsUnsuccessfulReconnects++\n    }\n    // Start with no reconnect timeout and increase timeout by\n    // using exponential backoff starting with 100ms\n    setTimeout(\n      setupWS,\n      math.min(\n        math.pow(2, provider.wsUnsuccessfulReconnects) * 100,\n        provider.maxBackoffTime\n      ),\n      provider\n    )\n  }\n}\n\n/**\n * @param {WebsocketProvider} provider\n */\nconst setupWS = (provider) => {\n  if (provider.shouldConnect && provider.ws === null) {\n    const websocket = new provider._WS(provider.url, provider.protocols)\n    websocket.binaryType = 'arraybuffer'\n    provider.ws = websocket\n    provider.wsconnecting = true\n    provider.wsconnected = false\n    provider.synced = false\n\n    websocket.onmessage = (event) => {\n      provider.wsLastMessageReceived = time.getUnixTime()\n      const encoder = readMessage(provider, new Uint8Array(event.data), true)\n      if (encoding.length(encoder) > 1) {\n        websocket.send(encoding.toUint8Array(encoder))\n      }\n    }\n    websocket.onerror = (event) => {\n      provider.emit('connection-error', [event, provider])\n    }\n    websocket.onclose = (event) => {\n      closeWebsocketConnection(provider, websocket, event)\n    }\n    websocket.onopen = () => {\n      provider.wsLastMessageReceived = time.getUnixTime()\n      provider.wsconnecting = false\n      provider.wsconnected = true\n      provider.wsUnsuccessfulReconnects = 0\n      provider.emit('status', [{\n        status: 'connected'\n      }])\n      // always send sync step 1 when connected\n      const encoder = encoding.createEncoder()\n      encoding.writeVarUint(encoder, messageSync)\n      syncProtocol.writeSyncStep1(encoder, provider.doc)\n      websocket.send(encoding.toUint8Array(encoder))\n      // broadcast local awareness state\n      if (provider.awareness.getLocalState() !== null) {\n        const encoderAwarenessState = encoding.createEncoder()\n        encoding.writeVarUint(encoderAwarenessState, messageAwareness)\n        encoding.writeVarUint8Array(\n          encoderAwarenessState,\n          awarenessProtocol.encodeAwarenessUpdate(provider.awareness, [\n            provider.doc.clientID\n          ])\n        )\n        websocket.send(encoding.toUint8Array(encoderAwarenessState))\n      }\n    }\n    provider.emit('status', [{\n      status: 'connecting'\n    }])\n  }\n}\n\n/**\n * @param {WebsocketProvider} provider\n * @param {ArrayBuffer} buf\n */\nconst broadcastMessage = (provider, buf) => {\n  const ws = provider.ws\n  if (provider.wsconnected && ws && ws.readyState === ws.OPEN) {\n    ws.send(buf)\n  }\n  if (provider.bcconnected) {\n    bc.publish(provider.bcChannel, buf, provider)\n  }\n}\n\n/**\n * Websocket Provider for Yjs. Creates a websocket connection to sync the shared document.\n * The document name is attached to the provided url. I.e. the following example\n * creates a websocket connection to http://localhost:1234/my-document-name\n *\n * @example\n *   import * as Y from 'yjs'\n *   import { WebsocketProvider } from 'y-websocket'\n *   const doc = new Y.Doc()\n *   const provider = new WebsocketProvider('http://localhost:1234', 'my-document-name', doc)\n *\n * @extends {ObservableV2<{ 'connection-close': (event: CloseEvent | null,  provider: WebsocketProvider) => any, 'status': (event: { status: 'connected' | 'disconnected' | 'connecting' }) => any, 'connection-error': (event: Event, provider: WebsocketProvider) => any, 'sync': (state: boolean) => any }>}\n */\nexport class WebsocketProvider extends ObservableV2 {\n  /**\n   * @param {string} serverUrl\n   * @param {string} roomname\n   * @param {Y.Doc} doc\n   * @param {object} opts\n   * @param {boolean} [opts.connect]\n   * @param {awarenessProtocol.Awareness} [opts.awareness]\n   * @param {Object<string,string>} [opts.params] specify url parameters\n   * @param {Array<string>} [opts.protocols] specify websocket protocols\n   * @param {typeof WebSocket} [opts.WebSocketPolyfill] Optionall provide a WebSocket polyfill\n   * @param {number} [opts.resyncInterval] Request server state every `resyncInterval` milliseconds\n   * @param {number} [opts.maxBackoffTime] Maximum amount of time to wait before trying to reconnect (we try to reconnect using exponential backoff)\n   * @param {boolean} [opts.disableBc] Disable cross-tab BroadcastChannel communication\n   */\n  constructor (serverUrl, roomname, doc, {\n    connect = true,\n    awareness = new awarenessProtocol.Awareness(doc),\n    params = {},\n    protocols = [],\n    WebSocketPolyfill = WebSocket,\n    resyncInterval = -1,\n    maxBackoffTime = 2500,\n    disableBc = false\n  } = {}) {\n    super()\n    // ensure that serverUrl does not end with /\n    while (serverUrl[serverUrl.length - 1] === '/') {\n      serverUrl = serverUrl.slice(0, serverUrl.length - 1)\n    }\n    this.serverUrl = serverUrl\n    this.bcChannel = serverUrl + '/' + roomname\n    this.maxBackoffTime = maxBackoffTime\n    /**\n     * The specified url parameters. This can be safely updated. The changed parameters will be used\n     * when a new connection is established.\n     * @type {Object<string,string>}\n     */\n    this.params = params\n    this.protocols = protocols\n    this.roomname = roomname\n    this.doc = doc\n    this._WS = WebSocketPolyfill\n    this.awareness = awareness\n    this.wsconnected = false\n    this.wsconnecting = false\n    this.bcconnected = false\n    this.disableBc = disableBc\n    this.wsUnsuccessfulReconnects = 0\n    this.messageHandlers = messageHandlers.slice()\n    /**\n     * @type {boolean}\n     */\n    this._synced = false\n    /**\n     * @type {WebSocket?}\n     */\n    this.ws = null\n    this.wsLastMessageReceived = 0\n    /**\n     * Whether to connect to other peers or not\n     * @type {boolean}\n     */\n    this.shouldConnect = connect\n\n    /**\n     * @type {number}\n     */\n    this._resyncInterval = 0\n    if (resyncInterval > 0) {\n      this._resyncInterval = /** @type {any} */ (setInterval(() => {\n        if (this.ws && this.ws.readyState === WebSocket.OPEN) {\n          // resend sync step 1\n          const encoder = encoding.createEncoder()\n          encoding.writeVarUint(encoder, messageSync)\n          syncProtocol.writeSyncStep1(encoder, doc)\n          this.ws.send(encoding.toUint8Array(encoder))\n        }\n      }, resyncInterval))\n    }\n\n    /**\n     * @param {ArrayBuffer} data\n     * @param {any} origin\n     */\n    this._bcSubscriber = (data, origin) => {\n      if (origin !== this) {\n        const encoder = readMessage(this, new Uint8Array(data), false)\n        if (encoding.length(encoder) > 1) {\n          bc.publish(this.bcChannel, encoding.toUint8Array(encoder), this)\n        }\n      }\n    }\n    /**\n     * Listens to Yjs updates and sends them to remote peers (ws and broadcastchannel)\n     * @param {Uint8Array} update\n     * @param {any} origin\n     */\n    this._updateHandler = (update, origin) => {\n      if (origin !== this) {\n        const encoder = encoding.createEncoder()\n        encoding.writeVarUint(encoder, messageSync)\n        syncProtocol.writeUpdate(encoder, update)\n        broadcastMessage(this, encoding.toUint8Array(encoder))\n      }\n    }\n    this.doc.on('update', this._updateHandler)\n    /**\n     * @param {any} changed\n     * @param {any} _origin\n     */\n    this._awarenessUpdateHandler = ({ added, updated, removed }, _origin) => {\n      const changedClients = added.concat(updated).concat(removed)\n      const encoder = encoding.createEncoder()\n      encoding.writeVarUint(encoder, messageAwareness)\n      encoding.writeVarUint8Array(\n        encoder,\n        awarenessProtocol.encodeAwarenessUpdate(awareness, changedClients)\n      )\n      broadcastMessage(this, encoding.toUint8Array(encoder))\n    }\n    this._exitHandler = () => {\n      awarenessProtocol.removeAwarenessStates(\n        this.awareness,\n        [doc.clientID],\n        'app closed'\n      )\n    }\n    if (env.isNode && typeof process !== 'undefined') {\n      process.on('exit', this._exitHandler)\n    }\n    awareness.on('update', this._awarenessUpdateHandler)\n    this._checkInterval = /** @type {any} */ (setInterval(() => {\n      if (\n        this.wsconnected &&\n        messageReconnectTimeout <\n          time.getUnixTime() - this.wsLastMessageReceived\n      ) {\n        // no message received in a long time - not even your own awareness\n        // updates (which are updated every 15 seconds)\n        closeWebsocketConnection(this, /** @type {WebSocket} */ (this.ws), null)\n      }\n    }, messageReconnectTimeout / 10))\n    if (connect) {\n      this.connect()\n    }\n  }\n\n  get url () {\n    const encodedParams = url.encodeQueryParams(this.params)\n    return this.serverUrl + '/' + this.roomname +\n      (encodedParams.length === 0 ? '' : '?' + encodedParams)\n  }\n\n  /**\n   * @type {boolean}\n   */\n  get synced () {\n    return this._synced\n  }\n\n  set synced (state) {\n    if (this._synced !== state) {\n      this._synced = state\n      // @ts-ignore\n      this.emit('synced', [state])\n      this.emit('sync', [state])\n    }\n  }\n\n  destroy () {\n    if (this._resyncInterval !== 0) {\n      clearInterval(this._resyncInterval)\n    }\n    clearInterval(this._checkInterval)\n    this.disconnect()\n    if (env.isNode && typeof process !== 'undefined') {\n      process.off('exit', this._exitHandler)\n    }\n    this.awareness.off('update', this._awarenessUpdateHandler)\n    this.doc.off('update', this._updateHandler)\n    super.destroy()\n  }\n\n  connectBc () {\n    if (this.disableBc) {\n      return\n    }\n    if (!this.bcconnected) {\n      bc.subscribe(this.bcChannel, this._bcSubscriber)\n      this.bcconnected = true\n    }\n    // send sync step1 to bc\n    // write sync step 1\n    const encoderSync = encoding.createEncoder()\n    encoding.writeVarUint(encoderSync, messageSync)\n    syncProtocol.writeSyncStep1(encoderSync, this.doc)\n    bc.publish(this.bcChannel, encoding.toUint8Array(encoderSync), this)\n    // broadcast local state\n    const encoderState = encoding.createEncoder()\n    encoding.writeVarUint(encoderState, messageSync)\n    syncProtocol.writeSyncStep2(encoderState, this.doc)\n    bc.publish(this.bcChannel, encoding.toUint8Array(encoderState), this)\n    // write queryAwareness\n    const encoderAwarenessQuery = encoding.createEncoder()\n    encoding.writeVarUint(encoderAwarenessQuery, messageQueryAwareness)\n    bc.publish(\n      this.bcChannel,\n      encoding.toUint8Array(encoderAwarenessQuery),\n      this\n    )\n    // broadcast local awareness state\n    const encoderAwarenessState = encoding.createEncoder()\n    encoding.writeVarUint(encoderAwarenessState, messageAwareness)\n    encoding.writeVarUint8Array(\n      encoderAwarenessState,\n      awarenessProtocol.encodeAwarenessUpdate(this.awareness, [\n        this.doc.clientID\n      ])\n    )\n    bc.publish(\n      this.bcChannel,\n      encoding.toUint8Array(encoderAwarenessState),\n      this\n    )\n  }\n\n  disconnectBc () {\n    // broadcast message with local awareness state set to null (indicating disconnect)\n    const encoder = encoding.createEncoder()\n    encoding.writeVarUint(encoder, messageAwareness)\n    encoding.writeVarUint8Array(\n      encoder,\n      awarenessProtocol.encodeAwarenessUpdate(this.awareness, [\n        this.doc.clientID\n      ], new Map())\n    )\n    broadcastMessage(this, encoding.toUint8Array(encoder))\n    if (this.bcconnected) {\n      bc.unsubscribe(this.bcChannel, this._bcSubscriber)\n      this.bcconnected = false\n    }\n  }\n\n  disconnect () {\n    this.shouldConnect = false\n    this.disconnectBc()\n    if (this.ws !== null) {\n      closeWebsocketConnection(this, this.ws, null)\n    }\n  }\n\n  connect () {\n    this.shouldConnect = true\n    if (!this.wsconnected && this.ws === null) {\n      setupWS(this)\n      this.connectBc()\n    }\n  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