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

tldraw infinite canvas SDK (multiplayer sync).

{
  "version": 3,
  "sources": ["../../src/lib/TLSocketRoom.ts"],
  "sourcesContent": ["import type { StoreSchema, UnknownRecord } from '@tldraw/store'\nimport { TLStoreSnapshot, createTLSchema } from '@tldraw/tlschema'\nimport { objectMapValues, structuredClone } from '@tldraw/utils'\nimport { RoomSessionState } from './RoomSession'\nimport { ServerSocketAdapter, WebSocketMinimal } from './ServerSocketAdapter'\nimport { TLSyncErrorCloseEventReason } from './TLSyncClient'\nimport { RoomSnapshot, RoomStoreMethods, TLSyncRoom } from './TLSyncRoom'\nimport { JsonChunkAssembler } from './chunk'\nimport { TLSocketServerSentEvent } from './protocol'\n\n// TODO: structured logging support\n/** @public */\nexport interface TLSyncLog {\n\twarn?(...args: any[]): void\n\terror?(...args: any[]): void\n}\n\n/** @public */\nexport class TLSocketRoom<R extends UnknownRecord = UnknownRecord, SessionMeta = void> {\n\tprivate room: TLSyncRoom<R, SessionMeta>\n\tprivate readonly sessions = new Map<\n\t\tstring,\n\t\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\t\t{ assembler: JsonChunkAssembler; socket: WebSocketMinimal; unlisten: () => void }\n\t>()\n\treadonly log?: TLSyncLog\n\tprivate readonly syncCallbacks: {\n\t\tonDataChange?(): void\n\t\tonPresenceChange?(): void\n\t}\n\n\tconstructor(\n\t\tpublic readonly opts: {\n\t\t\tinitialSnapshot?: RoomSnapshot | TLStoreSnapshot\n\t\t\tschema?: StoreSchema<R, any>\n\t\t\t// how long to wait for a client to communicate before disconnecting them\n\t\t\tclientTimeout?: number\n\t\t\tlog?: TLSyncLog\n\t\t\t// a callback that is called when a client is disconnected\n\t\t\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\t\t\tonSessionRemoved?: (\n\t\t\t\troom: TLSocketRoom<R, SessionMeta>,\n\t\t\t\targs: { sessionId: string; numSessionsRemaining: number; meta: SessionMeta }\n\t\t\t) => void\n\t\t\t// a callback that is called whenever a message is sent\n\t\t\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\t\t\tonBeforeSendMessage?: (args: {\n\t\t\t\tsessionId: string\n\t\t\t\t/** @internal keep the protocol private for now */\n\t\t\t\tmessage: TLSocketServerSentEvent<R>\n\t\t\t\tstringified: string\n\t\t\t\tmeta: SessionMeta\n\t\t\t}) => void\n\t\t\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\t\t\tonAfterReceiveMessage?: (args: {\n\t\t\t\tsessionId: string\n\t\t\t\t/** @internal keep the protocol private for now */\n\t\t\t\tmessage: TLSocketServerSentEvent<R>\n\t\t\t\tstringified: string\n\t\t\t\tmeta: SessionMeta\n\t\t\t}) => void\n\t\t\tonDataChange?(): void\n\t\t\t/** @internal */\n\t\t\tonPresenceChange?(): void\n\t\t}\n\t) {\n\t\tconst initialSnapshot =\n\t\t\topts.initialSnapshot && 'store' in opts.initialSnapshot\n\t\t\t\t? convertStoreSnapshotToRoomSnapshot(opts.initialSnapshot!)\n\t\t\t\t: opts.initialSnapshot\n\n\t\tthis.syncCallbacks = {\n\t\t\tonDataChange: opts.onDataChange,\n\t\t\tonPresenceChange: opts.onPresenceChange,\n\t\t}\n\t\tthis.room = new TLSyncRoom<R, SessionMeta>({\n\t\t\t...this.syncCallbacks,\n\t\t\tschema: opts.schema ?? (createTLSchema() as any),\n\t\t\tsnapshot: initialSnapshot,\n\t\t\tlog: opts.log,\n\t\t})\n\t\tthis.room.events.on('session_removed', (args) => {\n\t\t\tthis.sessions.delete(args.sessionId)\n\t\t\tif (this.opts.onSessionRemoved) {\n\t\t\t\tthis.opts.onSessionRemoved(this, {\n\t\t\t\t\tsessionId: args.sessionId,\n\t\t\t\t\tnumSessionsRemaining: this.room.sessions.size,\n\t\t\t\t\tmeta: args.meta,\n\t\t\t\t})\n\t\t\t}\n\t\t})\n\t\tthis.log = 'log' in opts ? opts.log : { error: console.error }\n\t}\n\n\t/**\n\t * Returns the number of active sessions.\n\t * Note that this is not the same as the number of connected sockets!\n\t * Sessions time out a few moments after sockets close, to smooth over network hiccups.\n\t *\n\t * @returns the number of active sessions\n\t */\n\tgetNumActiveSessions() {\n\t\treturn this.room.sessions.size\n\t}\n\n\t/**\n\t * Call this when a client establishes a new socket connection.\n\t *\n\t * - `sessionId` is a unique ID for a browser tab. This is passed as a query param by the useSync hook.\n\t * - `socket` is a WebSocket-like object that the server uses to communicate with the client.\n\t * - `isReadonly` is an optional boolean that can be set to true if the client should not be able to make changes to the document. They will still be able to send presence updates.\n\t * - `meta` is an optional object that can be used to store additional information about the session.\n\t *\n\t * @param opts - The options object\n\t */\n\thandleSocketConnect(\n\t\topts: {\n\t\t\tsessionId: string\n\t\t\tsocket: WebSocketMinimal\n\t\t\tisReadonly?: boolean\n\t\t} & (SessionMeta extends void ? object : { meta: SessionMeta })\n\t) {\n\t\tconst { sessionId, socket, isReadonly = false } = opts\n\t\tconst handleSocketMessage = (event: MessageEvent) =>\n\t\t\tthis.handleSocketMessage(sessionId, event.data)\n\t\tconst handleSocketError = this.handleSocketError.bind(this, sessionId)\n\t\tconst handleSocketClose = this.handleSocketClose.bind(this, sessionId)\n\n\t\tthis.sessions.set(sessionId, {\n\t\t\tassembler: new JsonChunkAssembler(),\n\t\t\tsocket,\n\t\t\tunlisten: () => {\n\t\t\t\tsocket.removeEventListener?.('message', handleSocketMessage)\n\t\t\t\tsocket.removeEventListener?.('close', handleSocketClose)\n\t\t\t\tsocket.removeEventListener?.('error', handleSocketError)\n\t\t\t},\n\t\t})\n\n\t\tthis.room.handleNewSession({\n\t\t\tsessionId,\n\t\t\tisReadonly,\n\t\t\tsocket: new ServerSocketAdapter({\n\t\t\t\tws: socket,\n\t\t\t\tonBeforeSendMessage: this.opts.onBeforeSendMessage\n\t\t\t\t\t? (message, stringified) =>\n\t\t\t\t\t\t\tthis.opts.onBeforeSendMessage!({\n\t\t\t\t\t\t\t\tsessionId,\n\t\t\t\t\t\t\t\tmessage,\n\t\t\t\t\t\t\t\tstringified,\n\t\t\t\t\t\t\t\tmeta: this.room.sessions.get(sessionId)?.meta as SessionMeta,\n\t\t\t\t\t\t\t})\n\t\t\t\t\t: undefined,\n\t\t\t}),\n\t\t\tmeta: 'meta' in opts ? (opts.meta as any) : undefined,\n\t\t})\n\n\t\tsocket.addEventListener?.('message', handleSocketMessage)\n\t\tsocket.addEventListener?.('close', handleSocketClose)\n\t\tsocket.addEventListener?.('error', handleSocketError)\n\t}\n\n\t/**\n\t * If executing in a server environment where sockets do not have instance-level listeners\n\t * (e.g. Bun.serve, Cloudflare Worker with WebSocket hibernation), you should call this\n\t * method when messages are received. See our self-hosting example for Bun.serve for an example.\n\t *\n\t * @param sessionId - The id of the session. (should match the one used when calling handleSocketConnect)\n\t * @param message - The message received from the client.\n\t */\n\thandleSocketMessage(sessionId: string, message: string | AllowSharedBufferSource) {\n\t\tconst assembler = this.sessions.get(sessionId)?.assembler\n\t\tif (!assembler) {\n\t\t\tthis.log?.warn?.('Received message from unknown session', sessionId)\n\t\t\treturn\n\t\t}\n\n\t\ttry {\n\t\t\tconst messageString =\n\t\t\t\ttypeof message === 'string' ? message : new TextDecoder().decode(message)\n\t\t\tconst res = assembler.handleMessage(messageString)\n\t\t\tif (!res) {\n\t\t\t\t// not enough chunks yet\n\t\t\t\treturn\n\t\t\t}\n\t\t\tif ('data' in res) {\n\t\t\t\t// need to do this first in case the session gets removed as a result of handling the message\n\t\t\t\tif (this.opts.onAfterReceiveMessage) {\n\t\t\t\t\tconst session = this.room.sessions.get(sessionId)\n\t\t\t\t\tif (session) {\n\t\t\t\t\t\tthis.opts.onAfterReceiveMessage({\n\t\t\t\t\t\t\tsessionId,\n\t\t\t\t\t\t\tmessage: res.data as any,\n\t\t\t\t\t\t\tstringified: res.stringified,\n\t\t\t\t\t\t\tmeta: session.meta,\n\t\t\t\t\t\t})\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tthis.room.handleMessage(sessionId, res.data as any)\n\t\t\t} else {\n\t\t\t\tthis.log?.error?.('Error assembling message', res.error)\n\t\t\t\t// close the socket to reset the connection\n\t\t\t\tthis.handleSocketError(sessionId)\n\t\t\t}\n\t\t} catch (e) {\n\t\t\tthis.log?.error?.(e)\n\t\t\t// here we use rejectSession rather than removeSession to support legacy clients\n\t\t\t// that use the old incompatibility_error close event\n\t\t\tthis.room.rejectSession(sessionId, TLSyncErrorCloseEventReason.UNKNOWN_ERROR)\n\t\t}\n\t}\n\n\t/**\n\t * If executing in a server environment where sockets do not have instance-level listeners,\n\t * call this when a socket error occurs.\n\t * @param sessionId - The id of the session. (should match the one used when calling handleSocketConnect)\n\t */\n\thandleSocketError(sessionId: string) {\n\t\tthis.room.handleClose(sessionId)\n\t}\n\n\t/**\n\t * If executing in a server environment where sockets do not have instance-level listeners,\n\t * call this when a socket is closed.\n\t * @param sessionId - The id of the session. (should match the one used when calling handleSocketConnect)\n\t */\n\thandleSocketClose(sessionId: string) {\n\t\tthis.room.handleClose(sessionId)\n\t}\n\n\t/**\n\t * Returns the current 'clock' of the document.\n\t * The clock is an integer that increments every time the document changes.\n\t * The clock is stored as part of the snapshot of the document for consistency purposes.\n\t *\n\t * @returns The clock\n\t */\n\tgetCurrentDocumentClock() {\n\t\treturn this.room.documentClock\n\t}\n\n\t/**\n\t * Returns a deeply cloned record from the store, if available.\n\t * @param id - The id of the record\n\t * @returns the cloned record\n\t */\n\tgetRecord(id: string) {\n\t\treturn structuredClone(this.room.state.get().documents[id]?.state)\n\t}\n\n\t/**\n\t * Returns a list of the sessions in the room.\n\t */\n\tgetSessions(): Array<{\n\t\tsessionId: string\n\t\tisConnected: boolean\n\t\tisReadonly: boolean\n\t\tmeta: SessionMeta\n\t}> {\n\t\treturn [...this.room.sessions.values()].map((session) => {\n\t\t\treturn {\n\t\t\t\tsessionId: session.sessionId,\n\t\t\t\tisConnected: session.state === RoomSessionState.Connected,\n\t\t\t\tisReadonly: session.isReadonly,\n\t\t\t\tmeta: session.meta,\n\t\t\t}\n\t\t})\n\t}\n\n\t/**\n\t * Return a snapshot of the document state, including clock-related bookkeeping.\n\t * You can store this and load it later on when initializing a TLSocketRoom.\n\t * You can also pass a snapshot to {@link TLSocketRoom#loadSnapshot} if you need to revert to a previous state.\n\t * @returns The snapshot\n\t */\n\tgetCurrentSnapshot() {\n\t\treturn this.room.getSnapshot()\n\t}\n\n\t/**\n\t * @internal\n\t */\n\tgetPresenceRecords() {\n\t\tconst result = {} as Record<string, UnknownRecord>\n\t\tfor (const document of Object.values(this.room.state.get().documents)) {\n\t\t\tif (document.state.typeName === this.room.presenceType?.typeName) {\n\t\t\t\tresult[document.state.id] = document.state\n\t\t\t}\n\t\t}\n\t\treturn result\n\t}\n\n\t/**\n\t * Return a serialized snapshot of the document state, including clock-related bookkeeping.\n\t * @returns The serialized snapshot\n\t * @internal\n\t */\n\tgetCurrentSerializedSnapshot() {\n\t\treturn JSON.stringify(this.room.getSnapshot())\n\t}\n\n\t/**\n\t * Load a snapshot of the document state, overwriting the current state.\n\t * @param snapshot - The snapshot to load\n\t */\n\tloadSnapshot(snapshot: RoomSnapshot | TLStoreSnapshot) {\n\t\tif ('store' in snapshot) {\n\t\t\tsnapshot = convertStoreSnapshotToRoomSnapshot(snapshot)\n\t\t}\n\t\tconst oldRoom = this.room\n\t\tconst oldIds = oldRoom.getSnapshot().documents.map((d) => d.state.id)\n\t\tconst newIds = new Set(snapshot.documents.map((d) => d.state.id))\n\t\tconst removedIds = oldIds.filter((id) => !newIds.has(id))\n\n\t\tconst tombstones = { ...snapshot.tombstones }\n\t\tremovedIds.forEach((id) => {\n\t\t\ttombstones[id] = oldRoom.clock + 1\n\t\t})\n\t\tnewIds.forEach((id) => {\n\t\t\tdelete tombstones[id]\n\t\t})\n\n\t\tconst newRoom = new TLSyncRoom<R, SessionMeta>({\n\t\t\t...this.syncCallbacks,\n\t\t\tschema: oldRoom.schema,\n\t\t\tsnapshot: {\n\t\t\t\tclock: oldRoom.clock + 1,\n\t\t\t\tdocuments: snapshot.documents.map((d) => ({\n\t\t\t\t\tlastChangedClock: oldRoom.clock + 1,\n\t\t\t\t\tstate: d.state,\n\t\t\t\t})),\n\t\t\t\tschema: snapshot.schema,\n\t\t\t\ttombstones,\n\t\t\t},\n\t\t\tlog: this.log,\n\t\t})\n\t\t// replace room with new one and kick out all the clients\n\t\tthis.room = newRoom\n\t\toldRoom.close()\n\t}\n\n\t/**\n\t * Allow applying changes to the store inside of a transaction.\n\t *\n\t * You can get values from the store by id with `store.get(id)`.\n\t * These values are safe to mutate, but to commit the changes you must call `store.put(...)` with the updated value.\n\t * You can get all values in the store with `store.getAll()`.\n\t * You can also delete values with `store.delete(id)`.\n\t *\n\t * @example\n\t * ```ts\n\t * room.updateStore(store => {\n\t *   const shape = store.get('shape:abc123')\n\t *   shape.meta.approved = true\n\t *   store.put(shape)\n\t * })\n\t * ```\n\t *\n\t * Changes to the store inside the callback are isolated from changes made by other clients until the transaction commits.\n\t *\n\t * @param updater - A function that will be called with a store object that can be used to make changes.\n\t * @returns A promise that resolves when the transaction is complete.\n\t */\n\tasync updateStore(updater: (store: RoomStoreMethods<R>) => void | Promise<void>) {\n\t\treturn this.room.updateStore(updater)\n\t}\n\n\t/**\n\t * Immediately remove a session from the room, and close its socket if not already closed.\n\t *\n\t * The client will attempt to reconnect unless you provide a `fatalReason` parameter.\n\t *\n\t * The `fatalReason` parameter will be available in the return value of the `useSync` hook as `useSync().error.reason`.\n\t *\n\t * @param sessionId - The id of the session to remove\n\t * @param fatalReason - The reason message to use when calling .close on the underlying websocket\n\t */\n\tcloseSession(sessionId: string, fatalReason?: TLSyncErrorCloseEventReason | string) {\n\t\tthis.room.rejectSession(sessionId, fatalReason)\n\t}\n\n\t/**\n\t * Close the room and disconnect all clients. Call this before discarding the room instance or shutting down the server.\n\t */\n\tclose() {\n\t\tthis.room.close()\n\t}\n\n\t/**\n\t * @returns true if the room is closed\n\t */\n\tisClosed() {\n\t\treturn this.room.isClosed()\n\t}\n}\n\n/** @public */\nexport type OmitVoid<T, KS extends keyof T = keyof T> = {\n\t[K in KS extends any ? (void extends T[KS] ? never : KS) : never]: T[K]\n}\n\nfunction convertStoreSnapshotToRoomSnapshot(snapshot: TLStoreSnapshot): RoomSnapshot {\n\treturn {\n\t\tclock: 0,\n\t\tdocuments: objectMapValues(snapshot.store).map((state) => ({\n\t\t\tstate,\n\t\t\tlastChangedClock: 0,\n\t\t})),\n\t\tschema: snapshot.schema,\n\t\ttombstones: {},\n\t}\n}\n"],
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