@colyseus/core/build/MatchMaker.mjs.map

Multiplayer Framework for Node.js.

{
  "version": 3,
  "sources": ["../src/MatchMaker.ts"],
  "sourcesContent": ["import { EventEmitter } from 'events';\nimport { ErrorCode, Protocol } from './Protocol.js';\n\nimport { requestFromIPC, subscribeIPC, subscribeWithTimeout } from './IPC.js';\n\nimport { Deferred, generateId, merge, retry, MAX_CONCURRENT_CREATE_ROOM_WAIT_TIME, REMOTE_ROOM_SHORT_TIMEOUT } from './utils/Utils.js';\nimport { isDevMode, cacheRoomHistory, getPreviousProcessId, getRoomRestoreListKey, reloadFromCache } from './utils/DevMode.js';\n\nimport { RegisteredHandler } from './matchmaker/RegisteredHandler.js';\nimport { Room, RoomInternalState } from './Room.js';\n\nimport { LocalPresence } from './presence/LocalPresence.js';\nimport { Presence } from './presence/Presence.js';\n\nimport { debugAndPrintError, debugMatchMaking } from './Debug.js';\nimport { SeatReservationError } from './errors/SeatReservationError.js';\nimport { ServerError } from './errors/ServerError.js';\n\nimport { IRoomCache, LocalDriver, MatchMakerDriver, SortOptions } from './matchmaker/driver/local/LocalDriver.js';\nimport controller from './matchmaker/controller.js';\nimport * as stats from './Stats.js';\n\nimport { logger } from './Logger.js';\nimport { AuthContext, Client } from './Transport.js';\nimport { Type } from './utils/types.js';\nimport { getHostname } from './discovery/index.js';\nimport { getLockId } from './matchmaker/driver/api.js';\n\nexport { controller, stats, type MatchMakerDriver };\n\nexport type ClientOptions = any;\nexport type SelectProcessIdCallback = (roomName: string, clientOptions: ClientOptions) => Promise<string>;\n\nexport interface SeatReservation {\n  sessionId: string;\n  room: IRoomCache;\n  devMode?: boolean;\n}\n\nconst handlers: {[id: string]: RegisteredHandler} = {};\nconst rooms: {[roomId: string]: Room} = {};\nconst events = new EventEmitter();\n\nexport let publicAddress: string;\nexport let processId: string;\nexport let presence: Presence;\nexport let driver: MatchMakerDriver;\nexport let selectProcessIdToCreateRoom: SelectProcessIdCallback;\n\n/**\n * Whether health checks are enabled or not. (default: true)\n *\n * Health checks are automatically performed on theses scenarios:\n * - At startup, to check for leftover/invalid processId's\n * - When a remote room creation request times out\n * - When a remote seat reservation request times out\n */\nlet enableHealthChecks: boolean = true;\nexport function setHealthChecksEnabled(value: boolean) {\n  enableHealthChecks = value;\n}\n\nexport let onReady: Deferred = new Deferred(); // onReady needs to be immediately available to @colyseus/auth integration.\n\nexport enum MatchMakerState {\n  INITIALIZING,\n  READY,\n  SHUTTING_DOWN\n}\n\n/**\n * Internal MatchMaker state\n */\nexport let state: MatchMakerState;\n\n/**\n * @private\n */\nexport async function setup(\n  _presence?: Presence,\n  _driver?: MatchMakerDriver,\n  _publicAddress?: string,\n  _selectProcessIdToCreateRoom?: SelectProcessIdCallback,\n) {\n  if (onReady === undefined) {\n    //\n    // for testing purposes only: onReady is turned into undefined on shutdown\n    // (needs refactoring.)\n    //\n    onReady = new Deferred();\n  }\n\n  state = MatchMakerState.INITIALIZING;\n\n  presence = _presence || new LocalPresence();\n\n  driver = _driver || new LocalDriver();\n  publicAddress = _publicAddress;\n\n  stats.reset(false);\n\n  // devMode: try to retrieve previous processId\n  if (isDevMode) { processId = await getPreviousProcessId(await getHostname()); }\n\n  // ensure processId is set\n  if (!processId) { processId = generateId(); }\n\n  /**\n   * Define default `assignRoomToProcessId` method.\n   * By default, return the process with least amount of rooms created\n   */\n  selectProcessIdToCreateRoom = _selectProcessIdToCreateRoom || async function () {\n    return (await stats.fetchAll())\n      .sort((p1, p2) => p1.roomCount > p2.roomCount ? 1 : -1)[0]?.processId || processId;\n  };\n\n  onReady.resolve();\n}\n\n/**\n * - Accept receiving remote room creation requests\n * - Check for leftover/invalid processId's on startup\n * @private\n */\nexport async function accept() {\n  await onReady; // make sure \"processId\" is available\n\n  /**\n   * Process-level subscription\n   * - handle remote process healthcheck\n   * - handle remote room creation\n   */\n  await subscribeIPC(presence, getProcessChannel(), (method, args) => {\n    if (method === 'healthcheck') {\n      // health check for this processId\n      return true;\n\n    } else {\n      // handle room creation\n      return handleCreateRoom.apply(undefined, args);\n    }\n  });\n\n  /**\n   * Check for leftover/invalid processId's on startup\n   */\n  if (enableHealthChecks) {\n    await healthCheckAllProcesses();\n\n    /*\n     * persist processId every 1 minute\n     *\n     * FIXME: this is a workaround in case this `processId` gets excluded\n     * (`stats.excludeProcess()`) by mistake due to health-check failure\n     */\n    stats.setAutoPersistInterval();\n  }\n\n  state = MatchMakerState.READY;\n\n  await stats.persist();\n\n  if (isDevMode) {\n    await reloadFromCache();\n  }\n}\n\n/**\n * Join or create into a room and return seat reservation\n */\nexport async function joinOrCreate(roomName: string, clientOptions: ClientOptions = {}, authContext?: AuthContext) {\n  return await retry<Promise<SeatReservation>>(async () => {\n    const authData = await callOnAuth(roomName, clientOptions, authContext);\n    let room: IRoomCache = await findOneRoomAvailable(roomName, clientOptions);\n\n    if (!room) {\n      const handler = getHandler(roomName);\n      const filterOptions = handler.getFilterOptions(clientOptions);\n      const concurrencyKey = getLockId(filterOptions);\n\n      //\n      // Prevent multiple rooms of same filter from being created concurrently\n      //\n      await concurrentJoinOrCreateRoomLock(handler, concurrencyKey, async (roomId?: string) => {\n        if (roomId) {\n          room = await driver.findOne({ roomId })\n        }\n\n        // If the room is not found or is already locked, try to find a new one\n        if (!room || room.locked) {\n          room = await findOneRoomAvailable(roomName, clientOptions);\n        }\n\n        if (!room) {\n          //\n          // TODO [?]\n          //    should we expose the \"creator\" auth data of the room during `onCreate()`?\n          //    it would be useful, though it could be accessed via `onJoin()` for now.\n          //\n          room = await createRoom(roomName, clientOptions);\n\n          // Notify waiting concurrent requests about the new room\n          presence.publish(`concurrent:${handler.name}:${concurrencyKey}`, room.roomId);\n        }\n\n        return room;\n      });\n    }\n\n    return await reserveSeatFor(room, clientOptions, authData);\n  }, 5, [SeatReservationError]);\n}\n\n/**\n * Create a room and return seat reservation\n */\nexport async function create(roomName: string, clientOptions: ClientOptions = {}, authContext?: AuthContext) {\n  const authData = await callOnAuth(roomName, clientOptions, authContext);\n  const room = await createRoom(roomName, clientOptions);\n  return reserveSeatFor(room, clientOptions, authData);\n}\n\n/**\n * Join a room and return seat reservation\n */\nexport async function join(roomName: string, clientOptions: ClientOptions = {}, authContext?: AuthContext) {\n  return await retry<Promise<SeatReservation>>(async () => {\n    const authData = await callOnAuth(roomName, clientOptions, authContext);\n    const room = await findOneRoomAvailable(roomName, clientOptions);\n\n    if (!room) {\n      throw new ServerError(ErrorCode.MATCHMAKE_INVALID_CRITERIA, `no rooms found with provided criteria`);\n    }\n\n    return reserveSeatFor(room, clientOptions, authData);\n  });\n}\n\n/**\n * Join a room by id and return seat reservation\n */\nexport async function reconnect(roomId: string, clientOptions: ClientOptions = {}) {\n  const room = await driver.findOne({ roomId });\n  if (!room) {\n    // TODO: support a \"logLevel\" out of the box?\n    if (process.env.NODE_ENV !== 'production') {\n      logger.info(`\u274C room \"${roomId}\" has been disposed. Did you miss .allowReconnection()?\\n\uD83D\uDC49 https://docs.colyseus.io/server/room/#allowreconnection-client-seconds`);\n    }\n\n    throw new ServerError(ErrorCode.MATCHMAKE_INVALID_ROOM_ID, `room \"${roomId}\" has been disposed.`);\n  }\n\n  // check for reconnection\n  const reconnectionToken = clientOptions.reconnectionToken;\n  if (!reconnectionToken) { throw new ServerError(ErrorCode.MATCHMAKE_UNHANDLED, `'reconnectionToken' must be provided for reconnection.`); }\n\n\n  // respond to re-connection!\n  const sessionId = await remoteRoomCall(room.roomId, 'checkReconnectionToken', [reconnectionToken]);\n  if (sessionId) {\n    return { room, sessionId };\n\n  } else {\n    // TODO: support a \"logLevel\" out of the box?\n    if (process.env.NODE_ENV !== 'production') {\n      logger.info(`\u274C reconnection token invalid or expired. Did you miss .allowReconnection()?\\n\uD83D\uDC49 https://docs.colyseus.io/server/room/#allowreconnection-client-seconds`);\n    }\n    throw new ServerError(ErrorCode.MATCHMAKE_EXPIRED, `reconnection token invalid or expired.`);\n  }\n}\n\n/**\n * Join a room by id and return client seat reservation. An exception is thrown if a room is not found for roomId.\n *\n * @param roomId - The Id of the specific room instance.\n * @param clientOptions - Options for the client seat reservation (for `onJoin`/`onAuth`)\n * @param authContext - Optional authentication token\n *\n * @returns Promise<SeatReservation> - A promise which contains `sessionId` and `IRoomCache`.\n */\nexport async function joinById(roomId: string, clientOptions: ClientOptions = {}, authContext?: AuthContext) {\n  const room = await driver.findOne({ roomId });\n\n  if (!room) {\n    throw new ServerError(ErrorCode.MATCHMAKE_INVALID_ROOM_ID, `room \"${roomId}\" not found`);\n\n  } else if (room.locked) {\n    throw new ServerError(ErrorCode.MATCHMAKE_INVALID_ROOM_ID, `room \"${roomId}\" is locked`);\n  }\n\n  const authData = await callOnAuth(room.name, clientOptions, authContext);\n\n  return reserveSeatFor(room, clientOptions, authData);\n}\n\n/**\n * Perform a query for all cached rooms\n */\nexport async function query(conditions: Partial<IRoomCache> = {}, sortOptions?: SortOptions) {\n  return await driver.query(conditions, sortOptions);\n}\n\n/**\n * Find for a public and unlocked room available.\n *\n * @param roomName - The Id of the specific room.\n * @param filterOptions - Filter options.\n * @param sortOptions - Sorting options.\n *\n * @returns Promise<IRoomCache> - A promise contaning an object which includes room metadata and configurations.\n */\nexport async function findOneRoomAvailable(\n  roomName: string,\n  filterOptions: ClientOptions,\n  additionalSortOptions?: SortOptions,\n) {\n  const handler = getHandler(roomName);\n  const sortOptions = Object.assign({}, handler.sortOptions ?? {});\n\n  if (additionalSortOptions) {\n    Object.assign(sortOptions, additionalSortOptions);\n  }\n\n  return await driver.findOne({\n    locked: false,\n    name: roomName,\n    private: false,\n    ...handler.getFilterOptions(filterOptions),\n  }, sortOptions);\n}\n\n/**\n * Call a method or return a property on a remote room.\n *\n * @param roomId - The Id of the specific room instance.\n * @param method - Method or attribute to call or retrive.\n * @param args - Array of arguments for the method\n *\n * @returns Promise<any> - Returned value from the called or retrieved method/attribute.\n */\nexport async function remoteRoomCall<R= any>(\n  roomId: string,\n  method: string,\n  args?: any[],\n  rejectionTimeout = REMOTE_ROOM_SHORT_TIMEOUT,\n): Promise<R> {\n  const room = rooms[roomId];\n\n  if (!room) {\n    try {\n      return await requestFromIPC<R>(presence, getRoomChannel(roomId), method, args, rejectionTimeout);\n\n    } catch (e) {\n\n      //\n      // the room cache from an unavailable process might've been used here.\n      // perform a health-check on the process before proceeding.\n      // (this is a broken state when a process wasn't gracefully shut down)\n      //\n      if (method === '_reserveSeat' && e.message === \"ipc_timeout\") {\n        throw e;\n      }\n\n      // TODO: for 1.0, consider always throwing previous error directly.\n\n      const request = `${method}${args && ' with args ' + JSON.stringify(args) || ''}`;\n      throw new ServerError(\n        ErrorCode.MATCHMAKE_UNHANDLED,\n        `remote room (${roomId}) timed out, requesting \"${request}\". (${rejectionTimeout}ms exceeded)`,\n      );\n    }\n\n  } else {\n    return (!args && typeof (room[method]) !== 'function')\n        ? room[method]\n        : (await room[method].apply(room, args && JSON.parse(JSON.stringify(args))));\n  }\n}\n\nexport function defineRoomType<T extends Type<Room>>(\n  roomName: string,\n  klass: T,\n  defaultOptions?: Parameters<NonNullable<InstanceType<T>['onCreate']>>[0],\n) {\n  const registeredHandler = new RegisteredHandler(roomName, klass, defaultOptions);\n\n  handlers[roomName] = registeredHandler;\n\n  if (klass.prototype['onAuth'] !== Room.prototype['onAuth']) {\n    // TODO: soft-deprecate instance level `onAuth` on 0.16\n    // logger.warn(\"DEPRECATION WARNING: onAuth() at the instance level will be deprecated soon. Please use static onAuth() instead.\");\n\n    if (klass['onAuth'] !== Room['onAuth']) {\n      logger.info(`\u274C \"${roomName}\"'s onAuth() defined at the instance level will be ignored.`);\n    }\n  }\n\n  return registeredHandler;\n}\n\nexport function removeRoomType(roomName: string) {\n  delete handlers[roomName];\n}\n\n// TODO: legacy; remove me on 1.0\nexport function hasHandler(roomName: string) {\n  logger.warn(\"hasHandler() is deprecated. Use getHandler() instead.\");\n  return handlers[roomName] !== undefined;\n}\n\nexport function getHandler(roomName: string) {\n  const handler = handlers[roomName];\n\n  if (!handler) {\n    throw new ServerError(ErrorCode.MATCHMAKE_NO_HANDLER, `provided room name \"${roomName}\" not defined`);\n  }\n\n  return handler;\n}\n\nexport function getRoomClass(roomName: string): Type<Room> {\n  return handlers[roomName]?.klass;\n}\n\n\n/**\n * Creates a new room.\n *\n * @param roomName - The identifier you defined on `gameServer.define()`\n * @param clientOptions - Options for `onCreate`\n *\n * @returns Promise<IRoomCache> - A promise contaning an object which includes room metadata and configurations.\n */\nexport async function createRoom(roomName: string, clientOptions: ClientOptions): Promise<IRoomCache> {\n  //\n  // - select a process to create the room\n  // - use local processId if MatchMaker is not ready yet\n  //\n  const selectedProcessId = (state === MatchMakerState.READY)\n    ? await selectProcessIdToCreateRoom(roomName, clientOptions)\n    : processId;\n\n  let room: IRoomCache;\n  if (selectedProcessId === undefined) {\n\n    if (isDevMode && processId === undefined) {\n      //\n      // WORKAROUND: wait for processId to be available\n      // TODO: Remove this check on 1.0\n      //\n      // - This is a workaround when using matchMaker.createRoom() before the processId is available.\n      // - We need to use top-level await to retrieve processId\n      //\n      await onReady;\n      return createRoom(roomName, clientOptions);\n\n    } else {\n      throw new ServerError(ErrorCode.MATCHMAKE_UNHANDLED, `no processId available to create room ${roomName}`);\n    }\n\n  } else if (selectedProcessId === processId) {\n    // create the room on this process!\n    room = await handleCreateRoom(roomName, clientOptions);\n\n  } else {\n    // ask other process to create the room!\n    try {\n      room = await requestFromIPC<IRoomCache>(\n        presence,\n        getProcessChannel(selectedProcessId),\n        undefined,\n        [roomName, clientOptions],\n        REMOTE_ROOM_SHORT_TIMEOUT,\n      );\n\n    } catch (e) {\n      if (e.message === \"ipc_timeout\") {\n        debugAndPrintError(`${e.message}: create room request timed out for ${roomName} on processId ${selectedProcessId}.`);\n\n        //\n        // clean-up possibly stale process from redis.\n        // when a process disconnects ungracefully, it may leave its previous processId under \"roomcount\"\n        // if the process is still alive, it will re-add itself shortly after the load-balancer selects it again.\n        //\n        if (enableHealthChecks) {\n          await stats.excludeProcess(selectedProcessId);\n        }\n\n        // if other process failed to respond, create the room on this process\n        room = await handleCreateRoom(roomName, clientOptions);\n\n      } else {\n        // re-throw intentional exception thrown during remote onCreate()\n        throw e;\n      }\n    }\n  }\n\n  if (isDevMode) {\n    presence.hset(getRoomRestoreListKey(), room.roomId, JSON.stringify({\n      \"clientOptions\": clientOptions,\n      \"roomName\": roomName,\n      \"processId\": processId\n    }));\n  }\n\n  return room;\n}\n\nexport async function handleCreateRoom(roomName: string, clientOptions: ClientOptions, restoringRoomId?: string): Promise<IRoomCache> {\n  const handler = getHandler(roomName);\n  const room = new handler.klass();\n\n  // set room public attributes\n  if (restoringRoomId && isDevMode) {\n    room.roomId = restoringRoomId;\n\n  } else {\n    room.roomId = generateId();\n  }\n\n  //\n  // Initialize .state (if set).\n  //\n  // Define getters and setters for:\n  //   - autoDispose\n  //   - patchRate\n  //\n  room['__init']();\n\n  room.roomName = roomName;\n  room.presence = presence;\n\n  const additionalListingData: any = handler.getFilterOptions(clientOptions);\n\n  // assign public host\n  if (publicAddress) {\n    additionalListingData.publicAddress = publicAddress;\n  }\n\n  // create a RoomCache reference.\n  room.listing = driver.createInstance({\n    name: roomName,\n    processId,\n    ...additionalListingData\n  });\n\n  if (room.onCreate) {\n    try {\n      await room.onCreate(merge({}, clientOptions, handler.options));\n\n    } catch (e) {\n      debugAndPrintError(e);\n      throw new ServerError(\n        e.code || ErrorCode.MATCHMAKE_UNHANDLED,\n        e.message,\n      );\n    }\n  }\n\n  room['_internalState'] = RoomInternalState.CREATED;\n\n  room.listing.roomId = room.roomId;\n  room.listing.maxClients = room.maxClients;\n\n  // imediatelly ask client to join the room\n  debugMatchMaking('spawning \\'%s\\', roomId: %s, processId: %s', roomName, room.roomId, processId);\n\n  // increment amount of rooms this process is handling\n  stats.local.roomCount++;\n  stats.persist();\n\n  room._events.on('lock', lockRoom.bind(this, room));\n  room._events.on('unlock', unlockRoom.bind(this, room));\n  room._events.on('join', onClientJoinRoom.bind(this, room));\n  room._events.on('leave', onClientLeaveRoom.bind(this, room));\n  room._events.on('visibility-change', onVisibilityChange.bind(this, room));\n  room._events.once('dispose', disposeRoom.bind(this, roomName, room));\n\n  // when disconnect()'ing, keep only join/leave events for stat counting\n  room._events.once('disconnect', () => {\n    room._events.removeAllListeners('lock');\n    room._events.removeAllListeners('unlock');\n    room._events.removeAllListeners('visibility-change');\n    room._events.removeAllListeners('dispose');\n\n    //\n    // emit \"no active rooms\" event when there are no more rooms in this process\n    // (used during graceful shutdown)\n    //\n    if (stats.local.roomCount <= 0) {\n      events.emit('no-active-rooms');\n    }\n  });\n\n  // room always start unlocked\n  await createRoomReferences(room, true);\n\n  // persist room data only if match-making is enabled\n  if (state !== MatchMakerState.SHUTTING_DOWN) {\n    await room.listing.save();\n  }\n\n  handler.emit('create', room);\n\n  return room.listing;\n}\n\n/**\n * Get room data by roomId.\n * This method does not return the actual room instance, use `getLocalRoomById` for that.\n */\nexport function getRoomById(roomId: string) {\n  return driver.findOne({ roomId });\n}\n\n/**\n * Get local room instance by roomId. (Can return \"undefined\" if the room is not available on this process)\n */\nexport function getLocalRoomById(roomId: string) {\n  return rooms[roomId];\n}\n\n/**\n * Disconnects every client on every room in the current process.\n */\nexport function disconnectAll(closeCode?: number) {\n  const promises: Array<Promise<any>> = [];\n\n  for (const roomId in rooms) {\n    if (!rooms.hasOwnProperty(roomId)) {\n      continue;\n    }\n\n    promises.push(rooms[roomId].disconnect(closeCode));\n  }\n\n  return promises;\n}\n\nasync function lockAndDisposeAll(): Promise<any> {\n  // remove processId from room count key\n  // (stops accepting new rooms on this process)\n  await stats.excludeProcess(processId);\n\n  // clear auto-persisting stats interval\n  if (enableHealthChecks) {\n    stats.clearAutoPersistInterval();\n  }\n\n  const noActiveRooms = new Deferred();\n  if (stats.local.roomCount <= 0) {\n    // no active rooms to dispose\n    noActiveRooms.resolve();\n\n  } else {\n    // wait for all rooms to be disposed\n    // TODO: set generous timeout in case\n    events.once('no-active-rooms', () => noActiveRooms.resolve());\n  }\n\n  // - lock all local rooms to prevent new joins\n  // - trigger `onBeforeShutdown()` on each room\n  for (const roomId in rooms) {\n    if (!rooms.hasOwnProperty(roomId)) {\n      continue;\n    }\n\n    const room = rooms[roomId];\n    room.lock();\n    room.onBeforeShutdown();\n  }\n\n  await noActiveRooms;\n}\n\nexport async function gracefullyShutdown(): Promise<any> {\n  if (state === MatchMakerState.SHUTTING_DOWN) {\n    return Promise.reject('already_shutting_down');\n  }\n\n  debugMatchMaking(`${processId} is shutting down!`);\n\n  state = MatchMakerState.SHUTTING_DOWN;\n\n  onReady = undefined;\n\n  // - lock existing rooms\n  // - stop accepting new rooms on this process\n  // - wait for all rooms to be disposed\n  await lockAndDisposeAll();\n\n  if (isDevMode) {\n    await cacheRoomHistory(rooms);\n  }\n\n  // make sure rooms are removed from cache\n  await removeRoomsByProcessId(processId);\n\n  // unsubscribe from process id channel\n  presence.unsubscribe(getProcessChannel());\n\n  // make sure all rooms are disposed\n  return Promise.all(disconnectAll(\n    (isDevMode)\n      ? Protocol.WS_CLOSE_DEVMODE_RESTART\n      : undefined\n  ));\n}\n\n/**\n * Reserve a seat for a client in a room\n */\nexport async function reserveSeatFor(room: IRoomCache, options: ClientOptions, authData?: any) {\n  const sessionId: string = authData?.sessionId || generateId();\n\n  debugMatchMaking(\n    'reserving seat. sessionId: \\'%s\\', roomId: \\'%s\\', processId: \\'%s\\'',\n    sessionId, room.roomId, processId,\n  );\n\n  let successfulSeatReservation: boolean;\n\n  try {\n    successfulSeatReservation = await remoteRoomCall(\n      room.roomId,\n      '_reserveSeat',\n      [sessionId, options, authData],\n      REMOTE_ROOM_SHORT_TIMEOUT,\n    );\n\n  } catch (e) {\n    debugMatchMaking(e);\n\n    //\n    // the room cache from an unavailable process might've been used here.\n    // (this is a broken state when a process wasn't gracefully shut down)\n    // perform a health-check on the process before proceeding.\n    //\n    if (\n      e.message === \"ipc_timeout\" &&\n      !(\n        enableHealthChecks &&\n        await healthCheckProcessId(room.processId)\n      )\n    ) {\n      throw new SeatReservationError(`process ${room.processId} is not available.`);\n\n    } else {\n      successfulSeatReservation = false;\n    }\n  }\n\n  if (!successfulSeatReservation) {\n    throw new SeatReservationError(`${room.roomId} is already full.`);\n  }\n\n  const response: SeatReservation = { room, sessionId };\n\n  if (isDevMode) {\n    response.devMode = isDevMode;\n  }\n\n  return response;\n}\n\nasync function callOnAuth(roomName: string, clientOptions?: ClientOptions, authContext?: AuthContext) {\n  const roomClass = getRoomClass(roomName);\n  if (roomClass && roomClass['onAuth'] && roomClass['onAuth'] !== Room['onAuth']) {\n    const result = await roomClass['onAuth'](authContext.token, clientOptions, authContext)\n    if (!result) {\n      throw new ServerError(ErrorCode.AUTH_FAILED, 'onAuth failed');\n    }\n    return result;\n  }\n}\n\n/**\n * Perform health check on all processes\n */\nexport async function healthCheckAllProcesses() {\n  const allStats = await stats.fetchAll();\n\n  const activeProcessChannels = (typeof(presence.channels) === \"function\") // TODO: remove this check on 0.17\n    ? (await presence.channels(\"p:*\")).map(c => c.substring(2))\n    : [];\n\n  if (allStats.length > 0) {\n    await Promise.all(\n      allStats\n        .filter(stat => (\n          stat.processId !== processId && // skip current process\n          !activeProcessChannels.includes(stat.processId) // skip if channel is still listening\n        ))\n        .map(stat => healthCheckProcessId(stat.processId))\n    );\n  }\n}\n\n/**\n * Perform health check on a remote process\n * @param processId\n */\nconst _healthCheckByProcessId: { [processId: string]: Promise<any> } = {};\nexport function healthCheckProcessId(processId: string) {\n  //\n  // re-use the same promise if health-check is already in progress\n  // (may occur when _reserveSeat() fails multiple times for the same 'processId')\n  //\n  if (_healthCheckByProcessId[processId] !== undefined) {\n    return _healthCheckByProcessId[processId];\n  }\n\n  _healthCheckByProcessId[processId] = new Promise<boolean>(async (resolve, reject) => {\n    logger.debug(`> Performing health-check against processId: '${processId}'...`);\n\n    try {\n      const requestTime = Date.now();\n\n      await requestFromIPC<IRoomCache>(\n        presence,\n        getProcessChannel(processId),\n        'healthcheck',\n        [],\n        REMOTE_ROOM_SHORT_TIMEOUT,\n      );\n\n      logger.debug(`\u2705 Process '${processId}' successfully responded (${Date.now() - requestTime}ms)`);\n\n      // succeeded to respond\n      resolve(true)\n\n    } catch (e) {\n      // process failed to respond - remove it from stats\n      logger.debug(`\u274C Process '${processId}' failed to respond. Cleaning it up.`);\n      const isProcessExcluded = await stats.excludeProcess(processId);\n\n      // clean-up possibly stale room ids\n      if (isProcessExcluded && !isDevMode) {\n        await removeRoomsByProcessId(processId);\n      }\n\n      resolve(false);\n    } finally {\n      delete _healthCheckByProcessId[processId];\n    }\n  });\n\n  return _healthCheckByProcessId[processId];\n}\n\n/**\n * Remove cached rooms by processId\n * @param processId\n */\nasync function removeRoomsByProcessId(processId: string) {\n  //\n  // clean-up possibly stale room ids\n  // (ungraceful shutdowns using Redis can result on stale room ids still on memory.)\n  //\n  await driver.cleanup(processId);\n}\n\nasync function createRoomReferences(room: Room, init: boolean = false): Promise<boolean> {\n  rooms[room.roomId] = room;\n\n  if (init) {\n    await subscribeIPC(\n      presence,\n      getRoomChannel(room.roomId),\n      (method, args) => {\n        return (!args && typeof (room[method]) !== 'function')\n          ? room[method]\n          : room[method].apply(room, args);\n      },\n    );\n  }\n\n  return true;\n}\n\n/**\n * Used only during `joinOrCreate` to handle concurrent requests for creating a room.\n */\nasync function concurrentJoinOrCreateRoomLock(\n  handler: RegisteredHandler,\n  concurrencyKey: string,\n  callback: (roomId?: string) => Promise<IRoomCache>\n): Promise<IRoomCache> {\n  return new Promise(async (resolve, reject) => {\n    const hkey = getConcurrencyHashKey(handler.name);\n    const concurrency = await presence.hincrbyex(\n      hkey,\n      concurrencyKey,\n      1, // increment by 1\n      MAX_CONCURRENT_CREATE_ROOM_WAIT_TIME * 2 // expire in 2x the time of MAX_CONCURRENT_CREATE_ROOM_WAIT_TIME\n    ) - 1; // do not consider the current request\n\n    const fulfill = async (roomId?: string) => {\n      try {\n        resolve(await callback(roomId));\n\n      } catch (e) {\n        reject(e);\n\n      } finally {\n        await presence.hincrbyex(hkey, concurrencyKey, -1, MAX_CONCURRENT_CREATE_ROOM_WAIT_TIME * 2);\n      }\n    };\n\n    if (concurrency > 0) {\n      debugMatchMaking(\n        'receiving %d concurrent joinOrCreate for \\'%s\\' (%s)',\n        concurrency, handler.name, concurrencyKey\n      );\n\n      try {\n        const roomId = await subscribeWithTimeout(\n          presence,\n          `concurrent:${handler.name}:${concurrencyKey}`,\n          (MAX_CONCURRENT_CREATE_ROOM_WAIT_TIME +\n            (Math.min(concurrency, 3) * 0.2)) * 1000 // convert to milliseconds\n        );\n\n        return await fulfill(roomId);\n      } catch (error) {\n        // Ignore ipc_timeout error\n      }\n    }\n\n    return await fulfill();\n  });\n}\n\nfunction onClientJoinRoom(room: Room, client: Client) {\n  // increment local CCU\n  stats.local.ccu++;\n  stats.persist();\n\n  handlers[room.roomName].emit('join', room, client);\n}\n\nfunction onClientLeaveRoom(room: Room, client: Client, willDispose: boolean) {\n  // decrement local CCU\n  stats.local.ccu--;\n  stats.persist();\n\n  handlers[room.roomName].emit('leave', room, client, willDispose);\n}\n\nfunction lockRoom(room: Room): void {\n  // emit public event on registered handler\n  handlers[room.roomName].emit('lock', room);\n}\n\nasync function unlockRoom(room: Room) {\n  if (await createRoomReferences(room)) {\n    // emit public event on registered handler\n    handlers[room.roomName].emit('unlock', room);\n  }\n}\n\nfunction onVisibilityChange(room: Room, isInvisible: boolean): void {\n  handlers[room.roomName].emit('visibility-change', room, isInvisible);\n}\n\nasync function disposeRoom(roomName: string, room: Room) {\n  debugMatchMaking('disposing \\'%s\\' (%s) on processId \\'%s\\' (graceful shutdown: %s)', roomName, room.roomId, processId, state === MatchMakerState.SHUTTING_DOWN);\n\n  //\n  // FIXME: this call should not be necessary.\n  //\n  // there's an unidentified edge case using LocalDriver where Room._dispose()\n  // doesn't seem to be called [?], but \"disposeRoom\" is, leaving the matchmaker\n  // in a broken state. (repeated ipc_timeout's for seat reservation on\n  // non-existing rooms)\n  //\n  room.listing.remove();\n  stats.local.roomCount--;\n\n  // decrease amount of rooms this process is handling\n  if (state !== MatchMakerState.SHUTTING_DOWN) {\n    stats.persist();\n\n    // remove from devMode restore list\n    if (isDevMode) {\n      await presence.hdel(getRoomRestoreListKey(), room.roomId);\n    }\n  }\n\n  // emit disposal on registered session handler\n  handlers[roomName].emit('dispose', room);\n\n  // unsubscribe from remote connections\n  presence.unsubscribe(getRoomChannel(room.roomId));\n\n  // remove actual room reference\n  delete rooms[room.roomId];\n}\n\n//\n// Presence keys\n//\nfunction getRoomChannel(roomId: string) {\n  return `$${roomId}`;\n}\n\nfunction getConcurrencyHashKey(roomName: string) {\n  // concurrency hash\n  return `ch:${roomName}`;\n}\n\nfunction getProcessChannel(id: string = processId) {\n  return `p:${id}`;\n}\n"],
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}