@tldraw/sync-core/dist-esm/lib/TLSyncClient.mjs.map

tldraw infinite canvas SDK (multiplayer sync).

{
  "version": 3,
  "sources": ["../../src/lib/TLSyncClient.ts"],
  "sourcesContent": ["import { Signal, react, transact } from '@tldraw/state'\nimport {\n\tRecordId,\n\tRecordsDiff,\n\tStore,\n\tUnknownRecord,\n\treverseRecordsDiff,\n\tsquashRecordDiffs,\n} from '@tldraw/store'\nimport {\n\texhaustiveSwitchError,\n\tfpsThrottle,\n\tisEqual,\n\tobjectMapEntries,\n\tuniqueId,\n} from '@tldraw/utils'\nimport { NetworkDiff, RecordOpType, applyObjectDiff, diffRecord, getNetworkDiff } from './diff'\nimport { interval } from './interval'\nimport {\n\tTLPushRequest,\n\tTLSocketClientSentEvent,\n\tTLSocketServerSentDataEvent,\n\tTLSocketServerSentEvent,\n\tgetTlsyncProtocolVersion,\n} from './protocol'\n\n/**\n * Function type for subscribing to events with a callback.\n * Returns an unsubscribe function to clean up the listener.\n *\n * @param cb - Callback function that receives the event value\n * @returns Function to call when you want to unsubscribe from the events\n *\n * @public\n */\nexport type SubscribingFn<T> = (cb: (val: T) => void) => () => void\n\n/**\n * WebSocket close code used by the server to signal a non-recoverable sync error.\n * This close code indicates that the connection is being terminated due to an error\n * that cannot be automatically recovered from, such as authentication failures,\n * incompatible client versions, or invalid data.\n *\n * @example\n * ```ts\n * // Server-side: Close connection with specific error reason\n * socket.close(TLSyncErrorCloseEventCode, TLSyncErrorCloseEventReason.NOT_FOUND)\n *\n * // Client-side: Handle the error in your sync error handler\n * const syncClient = new TLSyncClient({\n *   // ... other config\n *   onSyncError: (reason) => {\n *     console.error('Sync failed:', reason) // Will receive 'NOT_FOUND'\n *   }\n * })\n * ```\n *\n * @public\n */\nexport const TLSyncErrorCloseEventCode = 4099 as const\n\n/**\n * Predefined reasons for server-initiated connection closures.\n * These constants represent different error conditions that can cause\n * the sync server to terminate a WebSocket connection.\n *\n * @example\n * ```ts\n * // Server usage\n * if (!user.hasPermission(roomId)) {\n *   socket.close(TLSyncErrorCloseEventCode, TLSyncErrorCloseEventReason.FORBIDDEN)\n * }\n *\n * // Client error handling\n * syncClient.onSyncError((reason) => {\n *   switch (reason) {\n *     case TLSyncErrorCloseEventReason.NOT_FOUND:\n *       showError('Room does not exist')\n *       break\n *     case TLSyncErrorCloseEventReason.FORBIDDEN:\n *       showError('Access denied')\n *       break\n *     case TLSyncErrorCloseEventReason.CLIENT_TOO_OLD:\n *       showError('Please update your app')\n *       break\n *   }\n * })\n * ```\n *\n * @public\n */\nexport const TLSyncErrorCloseEventReason = {\n\t/** Room or resource not found */\n\tNOT_FOUND: 'NOT_FOUND',\n\t/** User lacks permission to access the room */\n\tFORBIDDEN: 'FORBIDDEN',\n\t/** User authentication required or invalid */\n\tNOT_AUTHENTICATED: 'NOT_AUTHENTICATED',\n\t/** Unexpected server error occurred */\n\tUNKNOWN_ERROR: 'UNKNOWN_ERROR',\n\t/** Client protocol version too old */\n\tCLIENT_TOO_OLD: 'CLIENT_TOO_OLD',\n\t/** Server protocol version too old */\n\tSERVER_TOO_OLD: 'SERVER_TOO_OLD',\n\t/** Client sent invalid or corrupted record data */\n\tINVALID_RECORD: 'INVALID_RECORD',\n\t/** Client exceeded rate limits */\n\tRATE_LIMITED: 'RATE_LIMITED',\n\t/** Room has reached maximum capacity */\n\tROOM_FULL: 'ROOM_FULL',\n} as const\n/**\n * Union type of all possible server connection close reasons.\n * Represents the string values that can be passed when a server closes\n * a sync connection due to an error condition.\n *\n * @public\n */\nexport type TLSyncErrorCloseEventReason =\n\t(typeof TLSyncErrorCloseEventReason)[keyof typeof TLSyncErrorCloseEventReason]\n\n/**\n * Handler function for custom application messages sent through the sync protocol.\n * These are user-defined messages that can be sent between clients via the sync server,\n * separate from the standard document synchronization messages.\n *\n * @param data - Custom message payload (application-defined structure)\n *\n * @example\n * ```ts\n * const customMessageHandler: TLCustomMessageHandler = (data) => {\n *   if (data.type === 'user_joined') {\n *     console.log(`${data.username} joined the session`)\n *     showToast(`${data.username} is now collaborating`)\n *   }\n * }\n *\n * const syncClient = new TLSyncClient({\n *   // ... other config\n *   onCustomMessageReceived: customMessageHandler\n * })\n * ```\n *\n * @public\n */\nexport type TLCustomMessageHandler = (this: null, data: any) => void\n\n/**\n * Event object describing changes in socket connection status.\n * Contains either a basic status change or an error with details.\n *\n * @public\n */\nexport type TLSocketStatusChangeEvent =\n\t| {\n\t\t\t/** Connection came online or went offline */\n\t\t\tstatus: 'online' | 'offline'\n\t  }\n\t| {\n\t\t\t/** Connection encountered an error */\n\t\t\tstatus: 'error'\n\t\t\t/** Description of the error that occurred */\n\t\t\treason: string\n\t  }\n/**\n * Callback function type for listening to socket status changes.\n *\n * @param params - Event object containing the new status and optional error details\n *\n * @internal\n */\nexport type TLSocketStatusListener = (params: TLSocketStatusChangeEvent) => void\n\n/**\n * Possible connection states for a persistent client socket.\n * Represents the current connectivity status between client and server.\n *\n * @internal\n */\nexport type TLPersistentClientSocketStatus = 'online' | 'offline' | 'error'\n\n/**\n * Mode for handling presence information in sync sessions.\n * Controls whether presence data (cursors, selections) is shared with other clients.\n *\n * @public\n */\nexport type TLPresenceMode =\n\t/** No presence sharing - client operates independently */\n\t| 'solo'\n\t/** Full presence sharing - cursors and selections visible to others */\n\t| 'full'\n/**\n * Interface for persistent WebSocket-like connections used by TLSyncClient.\n * Handles automatic reconnection and provides event-based communication with the sync server.\n * Implementations should maintain connection resilience and handle network interruptions gracefully.\n *\n * @example\n * ```ts\n * class MySocketAdapter implements TLPersistentClientSocket {\n *   connectionStatus: 'offline' | 'online' | 'error' = 'offline'\n *\n *   sendMessage(msg: TLSocketClientSentEvent) {\n *     if (this.ws && this.ws.readyState === WebSocket.OPEN) {\n *       this.ws.send(JSON.stringify(msg))\n *     }\n *   }\n *\n *   onReceiveMessage = (callback) => {\n *     // Set up message listener and return cleanup function\n *   }\n *\n *   restart() {\n *     this.disconnect()\n *     this.connect()\n *   }\n * }\n * ```\n *\n * @public\n */\nexport interface TLPersistentClientSocket<\n\tClientSentMessage extends object = object,\n\tServerSentMessage extends object = object,\n> {\n\t/** Current connection state - online means actively connected and ready */\n\tconnectionStatus: 'online' | 'offline' | 'error'\n\n\t/**\n\t * Send a protocol message to the sync server\n\t * @param msg - Message to send (connect, push, ping, etc.)\n\t */\n\tsendMessage(msg: ClientSentMessage): void\n\n\t/**\n\t * Subscribe to messages received from the server\n\t * @param callback - Function called for each received message\n\t * @returns Cleanup function to remove the listener\n\t */\n\tonReceiveMessage: SubscribingFn<ServerSentMessage>\n\n\t/**\n\t * Subscribe to connection status changes\n\t * @param callback - Function called when connection status changes\n\t * @returns Cleanup function to remove the listener\n\t */\n\tonStatusChange: SubscribingFn<TLSocketStatusChangeEvent>\n\n\t/**\n\t * Force a connection restart (disconnect then reconnect)\n\t * Used for error recovery or when connection health checks fail\n\t */\n\trestart(): void\n\n\t/**\n\t * Close the connection\n\t */\n\tclose(): void\n}\n\nconst PING_INTERVAL = 5000\nconst MAX_TIME_TO_WAIT_FOR_SERVER_INTERACTION_BEFORE_RESETTING_CONNECTION = PING_INTERVAL * 2\n\n// Should connect support chunking the response to allow for large payloads?\n\n/**\n * Main client-side synchronization engine for collaborative tldraw applications.\n *\n * TLSyncClient manages bidirectional synchronization between a local tldraw Store\n * and a remote sync server. It uses an optimistic update model where local changes\n * are immediately applied for responsive UI, then sent to the server for validation\n * and distribution to other clients.\n *\n * The synchronization follows a git-like push/pull/rebase model:\n * - **Push**: Local changes are sent to server as diff operations\n * - **Pull**: Server changes are received and applied locally\n * - **Rebase**: Conflicting changes are resolved by undoing local changes,\n *   applying server changes, then re-applying local changes on top\n *\n * @example\n * ```ts\n * import { TLSyncClient, ClientWebSocketAdapter } from '@tldraw/sync-core'\n * import { createTLStore } from '@tldraw/store'\n *\n * // Create store and socket\n * const store = createTLStore({ schema: mySchema })\n * const socket = new ClientWebSocketAdapter('ws://localhost:3000/sync')\n *\n * // Create sync client\n * const syncClient = new TLSyncClient({\n *   store,\n *   socket,\n *   presence: atom(null),\n *   onLoad: () => console.log('Connected and loaded'),\n *   onSyncError: (reason) => console.error('Sync failed:', reason)\n * })\n *\n * // Changes to store are now automatically synchronized\n * store.put([{ id: 'shape1', type: 'geo', x: 100, y: 100 }])\n * ```\n *\n * @example\n * ```ts\n * // Advanced usage with presence and custom messages\n * const syncClient = new TLSyncClient({\n *   store,\n *   socket,\n *   presence: atom({ cursor: { x: 0, y: 0 }, userName: 'Alice' }),\n *   presenceMode: atom('full'),\n *   onCustomMessageReceived: (data) => {\n *     if (data.type === 'chat') {\n *       showChatMessage(data.message, data.from)\n *     }\n *   },\n *   onAfterConnect: (client, { isReadonly }) => {\n *     if (isReadonly) {\n *       showNotification('Connected in read-only mode')\n *     }\n *   }\n * })\n * ```\n *\n * @public\n */\nexport class TLSyncClient<R extends UnknownRecord, S extends Store<R> = Store<R>> {\n\t/** The last clock time from the most recent server update */\n\tprivate lastServerClock = -1\n\tprivate lastServerInteractionTimestamp = Date.now()\n\n\t/** The queue of in-flight push requests that have not yet been acknowledged by the server */\n\tprivate pendingPushRequests: { request: TLPushRequest<R>; sent: boolean }[] = []\n\n\t/**\n\t * The diff of 'unconfirmed', 'optimistic' changes that have been made locally by the user if we\n\t * take this diff, reverse it, and apply that to the store, our store will match exactly the most\n\t * recent state of the server that we know about\n\t */\n\tprivate speculativeChanges: RecordsDiff<R> = {\n\t\tadded: {} as any,\n\t\tupdated: {} as any,\n\t\tremoved: {} as any,\n\t}\n\n\tprivate disposables: Array<() => void> = []\n\n\t/** @internal */\n\treadonly store: S\n\t/** @internal */\n\treadonly socket: TLPersistentClientSocket<TLSocketClientSentEvent<R>, TLSocketServerSentEvent<R>>\n\n\t/** @internal */\n\treadonly presenceState: Signal<R | null> | undefined\n\t/** @internal */\n\treadonly presenceMode: Signal<TLPresenceMode> | undefined\n\n\t// isOnline is true when we have an open socket connection and we have\n\t// established a connection with the server room (i.e. we have received a 'connect' message)\n\t/** @internal */\n\tisConnectedToRoom = false\n\n\t/**\n\t * The client clock is essentially a counter for push requests Each time a push request is created\n\t * the clock is incremented. This clock is sent with the push request to the server, and the\n\t * server returns it with the response so that we can match up the response with the request.\n\t *\n\t * The clock may also be used at one point in the future to allow the client to re-send push\n\t * requests idempotently (i.e. the server will keep track of each client's clock and not execute\n\t * requests it has already handled), but at the time of writing this is neither needed nor\n\t * implemented.\n\t */\n\tprivate clientClock = 0\n\n\t/**\n\t * Callback executed immediately after successful connection to sync room.\n\t * Use this to perform any post-connection setup required for your application,\n\t * such as initializing default content or updating UI state.\n\t *\n\t * @param self - The TLSyncClient instance that connected\n\t * @param details - Connection details\n\t *   - isReadonly - Whether the connection is in read-only mode\n\t */\n\tprivate readonly onAfterConnect?: (self: this, details: { isReadonly: boolean }) => void\n\n\tprivate readonly onCustomMessageReceived?: TLCustomMessageHandler\n\n\tprivate isDebugging = false\n\tprivate debug(...args: any[]) {\n\t\tif (this.isDebugging) {\n\t\t\t// eslint-disable-next-line no-console\n\t\t\tconsole.debug(...args)\n\t\t}\n\t}\n\n\tprivate readonly presenceType: R['typeName'] | null\n\n\tprivate didCancel?: () => boolean\n\n\t/**\n\t * Creates a new TLSyncClient instance to manage synchronization with a remote server.\n\t *\n\t * @param config - Configuration object for the sync client\n\t *   - store - The local tldraw store to synchronize\n\t *   - socket - WebSocket adapter for server communication\n\t *   - presence - Reactive signal containing current user's presence data\n\t *   - presenceMode - Optional signal controlling presence sharing (defaults to 'full')\n\t *   - onLoad - Callback fired when initial sync completes successfully\n\t *   - onSyncError - Callback fired when sync fails with error reason\n\t *   - onCustomMessageReceived - Optional handler for custom messages\n\t *   - onAfterConnect - Optional callback fired after successful connection\n\t *   - self - The TLSyncClient instance\n\t *   - details - Connection details including readonly status\n\t *   - didCancel - Optional function to check if sync should be cancelled\n\t */\n\tconstructor(config: {\n\t\tstore: S\n\t\tsocket: TLPersistentClientSocket<any, any>\n\t\tpresence: Signal<R | null>\n\t\tpresenceMode?: Signal<TLPresenceMode>\n\t\tonLoad(self: TLSyncClient<R, S>): void\n\t\tonSyncError(reason: string): void\n\t\tonCustomMessageReceived?: TLCustomMessageHandler\n\t\tonAfterConnect?(self: TLSyncClient<R, S>, details: { isReadonly: boolean }): void\n\t\tdidCancel?(): boolean\n\t}) {\n\t\tthis.didCancel = config.didCancel\n\n\t\tthis.presenceType = config.store.scopedTypes.presence.values().next().value ?? null\n\n\t\tif (typeof window !== 'undefined') {\n\t\t\t;(window as any).tlsync = this\n\t\t}\n\t\tthis.store = config.store\n\t\tthis.socket = config.socket\n\t\tthis.onAfterConnect = config.onAfterConnect\n\t\tthis.onCustomMessageReceived = config.onCustomMessageReceived\n\n\t\tlet didLoad = false\n\n\t\tthis.presenceState = config.presence\n\t\tthis.presenceMode = config.presenceMode\n\n\t\tthis.disposables.push(\n\t\t\t// when local 'user' changes are made, send them to the server\n\t\t\t// or stash them locally in offline mode\n\t\t\tthis.store.listen(\n\t\t\t\t({ changes }) => {\n\t\t\t\t\tif (this.didCancel?.()) return this.close()\n\t\t\t\t\tthis.debug('received store changes', { changes })\n\t\t\t\t\tthis.push(changes)\n\t\t\t\t},\n\t\t\t\t{ source: 'user', scope: 'document' }\n\t\t\t),\n\t\t\t// when the server sends us events, handle them\n\t\t\tthis.socket.onReceiveMessage((msg) => {\n\t\t\t\tif (this.didCancel?.()) return this.close()\n\t\t\t\tthis.debug('received message from server', msg)\n\t\t\t\tthis.handleServerEvent(msg)\n\t\t\t\t// the first time we receive a message from the server, we should trigger\n\n\t\t\t\t// one of the load callbacks\n\t\t\t\tif (!didLoad) {\n\t\t\t\t\tdidLoad = true\n\t\t\t\t\tconfig.onLoad(this)\n\t\t\t\t}\n\t\t\t}),\n\t\t\t// handle switching between online and offline\n\t\t\tthis.socket.onStatusChange((ev) => {\n\t\t\t\tif (this.didCancel?.()) return this.close()\n\t\t\t\tthis.debug('socket status changed', ev.status)\n\t\t\t\tif (ev.status === 'online') {\n\t\t\t\t\tthis.sendConnectMessage()\n\t\t\t\t} else {\n\t\t\t\t\tthis.resetConnection()\n\t\t\t\t\tif (ev.status === 'error') {\n\t\t\t\t\t\tdidLoad = true\n\t\t\t\t\t\tconfig.onSyncError(ev.reason)\n\t\t\t\t\t\tthis.close()\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}),\n\t\t\t// Send a ping every PING_INTERVAL ms while online\n\t\t\tinterval(() => {\n\t\t\t\tif (this.didCancel?.()) return this.close()\n\t\t\t\tthis.debug('ping loop', { isConnectedToRoom: this.isConnectedToRoom })\n\t\t\t\tif (!this.isConnectedToRoom) return\n\t\t\t\ttry {\n\t\t\t\t\tthis.socket.sendMessage({ type: 'ping' })\n\t\t\t\t} catch (error) {\n\t\t\t\t\tconsole.warn('ping failed, resetting', error)\n\t\t\t\t\tthis.resetConnection()\n\t\t\t\t}\n\t\t\t}, PING_INTERVAL),\n\t\t\t// Check the server connection health, reset the connection if needed\n\t\t\tinterval(() => {\n\t\t\t\tif (this.didCancel?.()) return this.close()\n\t\t\t\tthis.debug('health check loop', { isConnectedToRoom: this.isConnectedToRoom })\n\t\t\t\tif (!this.isConnectedToRoom) return\n\t\t\t\tconst timeSinceLastServerInteraction = Date.now() - this.lastServerInteractionTimestamp\n\n\t\t\t\tif (\n\t\t\t\t\ttimeSinceLastServerInteraction <\n\t\t\t\t\tMAX_TIME_TO_WAIT_FOR_SERVER_INTERACTION_BEFORE_RESETTING_CONNECTION\n\t\t\t\t) {\n\t\t\t\t\tthis.debug('health check passed', { timeSinceLastServerInteraction })\n\t\t\t\t\t// last ping was recent, so no need to take any action\n\t\t\t\t\treturn\n\t\t\t\t}\n\n\t\t\t\tconsole.warn(`Haven't heard from the server in a while, resetting connection...`)\n\t\t\t\tthis.resetConnection()\n\t\t\t}, PING_INTERVAL * 2)\n\t\t)\n\n\t\tif (this.presenceState) {\n\t\t\tthis.disposables.push(\n\t\t\t\treact('pushPresence', () => {\n\t\t\t\t\tif (this.didCancel?.()) return this.close()\n\t\t\t\t\tconst mode = this.presenceMode?.get()\n\t\t\t\t\tif (mode !== 'full') return\n\t\t\t\t\tthis.pushPresence(this.presenceState!.get())\n\t\t\t\t})\n\t\t\t)\n\t\t}\n\n\t\t// if the socket is already online before this client was instantiated\n\t\t// then we should send a connect message right away\n\t\tif (this.socket.connectionStatus === 'online') {\n\t\t\tthis.sendConnectMessage()\n\t\t}\n\t}\n\n\t/** @internal */\n\tlatestConnectRequestId: string | null = null\n\n\t/**\n\t * This is the first message that is sent over a newly established socket connection. And we need\n\t * to wait for the response before this client can be used.\n\t */\n\tprivate sendConnectMessage() {\n\t\tif (this.isConnectedToRoom) {\n\t\t\tconsole.error('sendConnectMessage called while already connected')\n\t\t\treturn\n\t\t}\n\t\tthis.debug('sending connect message')\n\t\tthis.latestConnectRequestId = uniqueId()\n\t\tthis.socket.sendMessage({\n\t\t\ttype: 'connect',\n\t\t\tconnectRequestId: this.latestConnectRequestId,\n\t\t\tschema: this.store.schema.serialize(),\n\t\t\tprotocolVersion: getTlsyncProtocolVersion(),\n\t\t\tlastServerClock: this.lastServerClock,\n\t\t})\n\t}\n\n\t/** Switch to offline mode */\n\tprivate resetConnection(hard = false) {\n\t\tthis.debug('resetting connection')\n\t\tif (hard) {\n\t\t\tthis.lastServerClock = 0\n\t\t}\n\t\t// kill all presence state\n\t\tconst keys = Object.keys(this.store.serialize('presence')) as any\n\t\tif (keys.length > 0) {\n\t\t\tthis.store.mergeRemoteChanges(() => {\n\t\t\t\tthis.store.remove(keys)\n\t\t\t})\n\t\t}\n\t\tthis.lastPushedPresenceState = null\n\t\tthis.isConnectedToRoom = false\n\t\tthis.pendingPushRequests = []\n\t\tthis.incomingDiffBuffer = []\n\t\tif (this.socket.connectionStatus === 'online') {\n\t\t\tthis.socket.restart()\n\t\t}\n\t}\n\n\t/**\n\t * Invoked when the socket connection comes online, either for the first time or as the result of\n\t * a reconnect. The goal is to rebase on the server's state and fire off a new push request for\n\t * any local changes that were made while offline.\n\t */\n\tprivate didReconnect(event: Extract<TLSocketServerSentEvent<R>, { type: 'connect' }>) {\n\t\tthis.debug('did reconnect', event)\n\t\tif (event.connectRequestId !== this.latestConnectRequestId) {\n\t\t\t// ignore connect events for old connect requests\n\t\t\treturn\n\t\t}\n\t\tthis.latestConnectRequestId = null\n\n\t\tif (this.isConnectedToRoom) {\n\t\t\tconsole.error('didReconnect called while already connected')\n\t\t\tthis.resetConnection(true)\n\t\t\treturn\n\t\t}\n\t\tif (this.pendingPushRequests.length > 0) {\n\t\t\tconsole.error('pendingPushRequests should already be empty when we reconnect')\n\t\t\tthis.resetConnection(true)\n\t\t\treturn\n\t\t}\n\t\t// at the end of this process we want to have at most one pending push request\n\t\t// based on anything inside this.speculativeChanges\n\t\ttransact(() => {\n\t\t\t// Now our goal is to rebase on the server's state.\n\t\t\t// This means wiping away any peer presence data, which the server will replace in full on every connect.\n\t\t\t// If the server does not have enough history to give us a partial document state hydration we will\n\t\t\t// also need to wipe away all of our document state before hydrating with the server's state from scratch.\n\t\t\tconst stashedChanges = this.speculativeChanges\n\t\t\tthis.speculativeChanges = { added: {} as any, updated: {} as any, removed: {} as any }\n\n\t\t\tthis.store.mergeRemoteChanges(() => {\n\t\t\t\t// gather records to delete in a NetworkDiff\n\t\t\t\tconst wipeDiff: NetworkDiff<R> = {}\n\t\t\t\tconst wipeAll = event.hydrationType === 'wipe_all'\n\t\t\t\tif (!wipeAll) {\n\t\t\t\t\t// if we're only wiping presence data, undo the speculative changes first\n\t\t\t\t\tthis.store.applyDiff(reverseRecordsDiff(stashedChanges), { runCallbacks: false })\n\t\t\t\t}\n\n\t\t\t\t// now wipe all presence data and, if needed, all document data\n\t\t\t\tfor (const [id, record] of objectMapEntries(this.store.serialize('all'))) {\n\t\t\t\t\tif (\n\t\t\t\t\t\t(wipeAll && this.store.scopedTypes.document.has(record.typeName)) ||\n\t\t\t\t\t\trecord.typeName === this.presenceType\n\t\t\t\t\t) {\n\t\t\t\t\t\twipeDiff[id] = [RecordOpType.Remove]\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// then apply the upstream changes\n\t\t\t\tthis.applyNetworkDiff({ ...wipeDiff, ...event.diff }, true)\n\n\t\t\t\tthis.isConnectedToRoom = true\n\n\t\t\t\t// now re-apply the speculative changes creating a new push request with the\n\t\t\t\t// appropriate diff\n\t\t\t\tconst speculativeChanges = this.store.filterChangesByScope(\n\t\t\t\t\tthis.store.extractingChanges(() => {\n\t\t\t\t\t\tthis.store.applyDiff(stashedChanges)\n\t\t\t\t\t}),\n\t\t\t\t\t'document'\n\t\t\t\t)\n\t\t\t\tif (speculativeChanges) this.push(speculativeChanges)\n\t\t\t})\n\n\t\t\t// this.isConnectedToRoom = true\n\t\t\t// this.store.applyDiff(stashedChanges, false)\n\n\t\t\tthis.onAfterConnect?.(this, { isReadonly: event.isReadonly })\n\t\t\tconst presence = this.presenceState?.get()\n\t\t\tif (presence) {\n\t\t\t\tthis.pushPresence(presence)\n\t\t\t}\n\t\t})\n\n\t\tthis.lastServerClock = event.serverClock\n\t}\n\n\tprivate incomingDiffBuffer: TLSocketServerSentDataEvent<R>[] = []\n\n\t/** Handle events received from the server */\n\tprivate handleServerEvent(event: TLSocketServerSentEvent<R>) {\n\t\tthis.debug('received server event', event)\n\t\tthis.lastServerInteractionTimestamp = Date.now()\n\t\t// always update the lastServerClock when it is present\n\t\tswitch (event.type) {\n\t\t\tcase 'connect':\n\t\t\t\tthis.didReconnect(event)\n\t\t\t\tbreak\n\t\t\t// legacy v4 events\n\t\t\tcase 'patch':\n\t\t\tcase 'push_result':\n\t\t\t\tif (!this.isConnectedToRoom) break\n\t\t\t\tthis.incomingDiffBuffer.push(event)\n\t\t\t\tthis.scheduleRebase()\n\t\t\t\tbreak\n\t\t\tcase 'data':\n\t\t\t\t// wait for a connect to succeed before processing more events\n\t\t\t\tif (!this.isConnectedToRoom) break\n\t\t\t\tthis.incomingDiffBuffer.push(...event.data)\n\t\t\t\tthis.scheduleRebase()\n\t\t\t\tbreak\n\t\t\tcase 'incompatibility_error':\n\t\t\t\t// legacy unrecoverable errors\n\t\t\t\tconsole.error('incompatibility error is legacy and should no longer be sent by the server')\n\t\t\t\tbreak\n\t\t\tcase 'pong':\n\t\t\t\t// noop, we only use ping/pong to set lastSeverInteractionTimestamp\n\t\t\t\tbreak\n\t\t\tcase 'custom':\n\t\t\t\tthis.onCustomMessageReceived?.call(null, event.data)\n\t\t\t\tbreak\n\n\t\t\tdefault:\n\t\t\t\texhaustiveSwitchError(event)\n\t\t}\n\t}\n\n\t/**\n\t * Closes the sync client and cleans up all resources.\n\t *\n\t * Call this method when you no longer need the sync client to prevent\n\t * memory leaks and close the WebSocket connection. After calling close(),\n\t * the client cannot be reused.\n\t *\n\t * @example\n\t * ```ts\n\t * // Clean shutdown\n\t * syncClient.close()\n\t * ```\n\t */\n\tclose() {\n\t\tthis.debug('closing')\n\t\tthis.disposables.forEach((dispose) => dispose())\n\t\tthis.flushPendingPushRequests.cancel?.()\n\t\tthis.scheduleRebase.cancel?.()\n\t}\n\n\tprivate lastPushedPresenceState: R | null = null\n\n\tprivate pushPresence(nextPresence: R | null) {\n\t\t// make sure we push any document changes first\n\t\tthis.store._flushHistory()\n\n\t\tif (!this.isConnectedToRoom) {\n\t\t\t// if we're offline, don't do anything\n\t\t\treturn\n\t\t}\n\n\t\tlet presence: TLPushRequest<any>['presence'] = undefined\n\t\tif (!this.lastPushedPresenceState && nextPresence) {\n\t\t\t// we don't have a last presence state, so we need to push the full state\n\t\t\tpresence = [RecordOpType.Put, nextPresence]\n\t\t} else if (this.lastPushedPresenceState && nextPresence) {\n\t\t\t// we have a last presence state, so we need to push a diff if there is one\n\t\t\tconst diff = diffRecord(this.lastPushedPresenceState, nextPresence)\n\t\t\tif (diff) {\n\t\t\t\tpresence = [RecordOpType.Patch, diff]\n\t\t\t}\n\t\t}\n\n\t\tif (!presence) return\n\t\tthis.lastPushedPresenceState = nextPresence\n\n\t\t// if there is a pending push that has not been sent and does not already include a presence update,\n\t\t// then add this presence update to it\n\t\tconst lastPush = this.pendingPushRequests.at(-1)\n\t\tif (lastPush && !lastPush.sent && !lastPush.request.presence) {\n\t\t\tlastPush.request.presence = presence\n\t\t\treturn\n\t\t}\n\n\t\t// otherwise, create a new push request\n\t\tconst req: TLPushRequest<R> = {\n\t\t\ttype: 'push',\n\t\t\tclientClock: this.clientClock++,\n\t\t\tpresence,\n\t\t}\n\n\t\tif (req) {\n\t\t\tthis.pendingPushRequests.push({ request: req, sent: false })\n\t\t\tthis.flushPendingPushRequests()\n\t\t}\n\t}\n\n\t/** Push a change to the server, or stash it locally if we're offline */\n\tprivate push(change: RecordsDiff<any>) {\n\t\tthis.debug('push', change)\n\t\t// the Store doesn't do deep equality checks when making changes\n\t\t// so it's possible that the diff passed in here is actually a no-op.\n\t\t// either way, we also don't want to send whole objects over the wire if\n\t\t// only small parts of them have changed, so we'll do a shallow-ish diff\n\t\t// which also uses deep equality checks to see if the change is actually\n\t\t// a no-op.\n\t\tconst diff = getNetworkDiff(change)\n\t\tif (!diff) return\n\n\t\t// the change is not a no-op so we'll send it to the server\n\t\t// but first let's merge the records diff into the speculative changes\n\t\tthis.speculativeChanges = squashRecordDiffs([this.speculativeChanges, change])\n\n\t\tif (!this.isConnectedToRoom) {\n\t\t\t// don't sent push requests or even store them up while offline\n\t\t\t// when we come back online we'll generate another push request from\n\t\t\t// scratch based on the speculativeChanges diff\n\t\t\treturn\n\t\t}\n\n\t\tconst pushRequest: TLPushRequest<R> = {\n\t\t\ttype: 'push',\n\t\t\tdiff,\n\t\t\tclientClock: this.clientClock++,\n\t\t}\n\n\t\tthis.pendingPushRequests.push({ request: pushRequest, sent: false })\n\n\t\t// immediately calling .send on the websocket here was causing some interaction\n\t\t// slugishness when e.g. drawing or translating shapes. Seems like it blocks\n\t\t// until the send completes. So instead we'll schedule a send to happen on some\n\t\t// tick in the near future.\n\t\tthis.flushPendingPushRequests()\n\t}\n\n\t/** Send any unsent push requests to the server */\n\tprivate flushPendingPushRequests = fpsThrottle(() => {\n\t\tthis.debug('flushing pending push requests', {\n\t\t\tisConnectedToRoom: this.isConnectedToRoom,\n\t\t\tpendingPushRequests: this.pendingPushRequests,\n\t\t})\n\t\tif (!this.isConnectedToRoom || this.store.isPossiblyCorrupted()) {\n\t\t\treturn\n\t\t}\n\t\tfor (const pendingPushRequest of this.pendingPushRequests) {\n\t\t\tif (!pendingPushRequest.sent) {\n\t\t\t\tif (this.socket.connectionStatus !== 'online') {\n\t\t\t\t\t// we went offline, so don't send anything\n\t\t\t\t\treturn\n\t\t\t\t}\n\t\t\t\tthis.socket.sendMessage(pendingPushRequest.request)\n\t\t\t\tpendingPushRequest.sent = true\n\t\t\t}\n\t\t}\n\t})\n\n\t/**\n\t * Applies a 'network' diff to the store this does value-based equality checking so that if the\n\t * data is the same (as opposed to merely identical with ===), then no change is made and no\n\t * changes will be propagated back to store listeners\n\t */\n\tprivate applyNetworkDiff(diff: NetworkDiff<R>, runCallbacks: boolean) {\n\t\tthis.debug('applyNetworkDiff', diff)\n\t\tconst changes: RecordsDiff<R> = { added: {} as any, updated: {} as any, removed: {} as any }\n\t\ttype k = keyof typeof changes.updated\n\t\tlet hasChanges = false\n\t\tfor (const [id, op] of objectMapEntries(diff)) {\n\t\t\tif (op[0] === RecordOpType.Put) {\n\t\t\t\tconst existing = this.store.get(id as RecordId<any>)\n\t\t\t\tif (existing && !isEqual(existing, op[1])) {\n\t\t\t\t\thasChanges = true\n\t\t\t\t\tchanges.updated[id as k] = [existing, op[1]]\n\t\t\t\t} else {\n\t\t\t\t\thasChanges = true\n\t\t\t\t\tchanges.added[id as k] = op[1]\n\t\t\t\t}\n\t\t\t} else if (op[0] === RecordOpType.Patch) {\n\t\t\t\tconst record = this.store.get(id as RecordId<any>)\n\t\t\t\tif (!record) {\n\t\t\t\t\t// the record was removed upstream\n\t\t\t\t\tcontinue\n\t\t\t\t}\n\t\t\t\tconst patched = applyObjectDiff(record, op[1])\n\t\t\t\thasChanges = true\n\t\t\t\tchanges.updated[id as k] = [record, patched]\n\t\t\t} else if (op[0] === RecordOpType.Remove) {\n\t\t\t\tif (this.store.has(id as RecordId<any>)) {\n\t\t\t\t\thasChanges = true\n\t\t\t\t\tchanges.removed[id as k] = this.store.get(id as RecordId<any>)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tif (hasChanges) {\n\t\t\tthis.store.applyDiff(changes, { runCallbacks })\n\t\t}\n\t}\n\n\t// eslint-disable-next-line local/prefer-class-methods\n\tprivate rebase = () => {\n\t\t// need to make sure that our speculative changes are in sync with the actual store instance before\n\t\t// proceeding, to avoid inconsistency bugs.\n\t\tthis.store._flushHistory()\n\t\tif (this.incomingDiffBuffer.length === 0) return\n\n\t\tconst diffs = this.incomingDiffBuffer\n\t\tthis.incomingDiffBuffer = []\n\n\t\ttry {\n\t\t\tthis.store.mergeRemoteChanges(() => {\n\t\t\t\t// first undo speculative changes\n\t\t\t\tthis.store.applyDiff(reverseRecordsDiff(this.speculativeChanges), { runCallbacks: false })\n\n\t\t\t\t// then apply network diffs on top of known-to-be-synced data\n\t\t\t\tfor (const diff of diffs) {\n\t\t\t\t\tif (diff.type === 'patch') {\n\t\t\t\t\t\tthis.applyNetworkDiff(diff.diff, true)\n\t\t\t\t\t\tcontinue\n\t\t\t\t\t}\n\t\t\t\t\t// handling push_result\n\t\t\t\t\tif (this.pendingPushRequests.length === 0) {\n\t\t\t\t\t\tthrow new Error('Received push_result but there are no pending push requests')\n\t\t\t\t\t}\n\t\t\t\t\tif (this.pendingPushRequests[0].request.clientClock !== diff.clientClock) {\n\t\t\t\t\t\tthrow new Error(\n\t\t\t\t\t\t\t'Received push_result for a push request that is not at the front of the queue'\n\t\t\t\t\t\t)\n\t\t\t\t\t}\n\t\t\t\t\tif (diff.action === 'discard') {\n\t\t\t\t\t\tthis.pendingPushRequests.shift()\n\t\t\t\t\t} else if (diff.action === 'commit') {\n\t\t\t\t\t\tconst { request } = this.pendingPushRequests.shift()!\n\t\t\t\t\t\tif ('diff' in request && request.diff) {\n\t\t\t\t\t\t\tthis.applyNetworkDiff(request.diff, true)\n\t\t\t\t\t\t}\n\t\t\t\t\t} else {\n\t\t\t\t\t\tthis.applyNetworkDiff(diff.action.rebaseWithDiff, true)\n\t\t\t\t\t\tthis.pendingPushRequests.shift()\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// update the speculative diff while re-applying pending changes\n\t\t\t\ttry {\n\t\t\t\t\tthis.speculativeChanges = this.store.extractingChanges(() => {\n\t\t\t\t\t\tfor (const { request } of this.pendingPushRequests) {\n\t\t\t\t\t\t\tif (!('diff' in request) || !request.diff) continue\n\t\t\t\t\t\t\tthis.applyNetworkDiff(request.diff, true)\n\t\t\t\t\t\t}\n\t\t\t\t\t})\n\t\t\t\t} catch (e) {\n\t\t\t\t\tconsole.error(e)\n\t\t\t\t\t// throw away the speculative changes and start over\n\t\t\t\t\tthis.speculativeChanges = { added: {} as any, updated: {} as any, removed: {} as any }\n\t\t\t\t\tthis.resetConnection()\n\t\t\t\t}\n\t\t\t})\n\t\t\tthis.lastServerClock = diffs.at(-1)?.serverClock ?? this.lastServerClock\n\t\t} catch (e) {\n\t\t\tconsole.error(e)\n\t\t\tthis.store.ensureStoreIsUsable()\n\t\t\tthis.resetConnection()\n\t\t}\n\t}\n\n\tprivate scheduleRebase = fpsThrottle(this.rebase)\n}\n"],
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