@colyseus/core/build/MatchMaker.mjs

Multiplayer Framework for Node.js.

// packages/core/src/MatchMaker.ts
import { EventEmitter } from "events";
import { ErrorCode, Protocol } from "./Protocol.mjs";
import { requestFromIPC, subscribeIPC, subscribeWithTimeout } from "./IPC.mjs";
import { Deferred, generateId, merge, retry, MAX_CONCURRENT_CREATE_ROOM_WAIT_TIME, REMOTE_ROOM_SHORT_TIMEOUT } from "./utils/Utils.mjs";
import { isDevMode, cacheRoomHistory, getPreviousProcessId, getRoomRestoreListKey, reloadFromCache } from "./utils/DevMode.mjs";
import { RegisteredHandler } from "./matchmaker/RegisteredHandler.mjs";
import { Room, RoomInternalState } from "./Room.mjs";
import { LocalPresence } from "./presence/LocalPresence.mjs";
import { debugAndPrintError, debugMatchMaking } from "./Debug.mjs";
import { SeatReservationError } from "./errors/SeatReservationError.mjs";
import { ServerError } from "./errors/ServerError.mjs";
import { LocalDriver } from "./matchmaker/driver/local/LocalDriver.mjs";
import controller from "./matchmaker/controller.mjs";
import * as stats from "./Stats.mjs";
import { logger } from "./Logger.mjs";
import { getHostname } from "./discovery/index.mjs";
import { getLockId } from "./matchmaker/driver/api.mjs";
var handlers = {};
var rooms = {};
var events = new EventEmitter();
var publicAddress;
var processId;
var presence;
var driver;
var selectProcessIdToCreateRoom;
var enableHealthChecks = true;
function setHealthChecksEnabled(value) {
  enableHealthChecks = value;
}
var onReady = new Deferred();
var MatchMakerState = /* @__PURE__ */ ((MatchMakerState2) => {
  MatchMakerState2[MatchMakerState2["INITIALIZING"] = 0] = "INITIALIZING";
  MatchMakerState2[MatchMakerState2["READY"] = 1] = "READY";
  MatchMakerState2[MatchMakerState2["SHUTTING_DOWN"] = 2] = "SHUTTING_DOWN";
  return MatchMakerState2;
})(MatchMakerState || {});
var state;
async function setup(_presence, _driver, _publicAddress, _selectProcessIdToCreateRoom) {
  if (onReady === void 0) {
    onReady = new Deferred();
  }
  state = 0 /* INITIALIZING */;
  presence = _presence || new LocalPresence();
  driver = _driver || new LocalDriver();
  publicAddress = _publicAddress;
  stats.reset(false);
  if (isDevMode) {
    processId = await getPreviousProcessId(await getHostname());
  }
  if (!processId) {
    processId = generateId();
  }
  selectProcessIdToCreateRoom = _selectProcessIdToCreateRoom || async function() {
    return (await stats.fetchAll()).sort((p1, p2) => p1.roomCount > p2.roomCount ? 1 : -1)[0]?.processId || processId;
  };
  onReady.resolve();
}
async function accept() {
  await onReady;
  await subscribeIPC(presence, getProcessChannel(), (method, args) => {
    if (method === "healthcheck") {
      return true;
    } else {
      return handleCreateRoom.apply(void 0, args);
    }
  });
  if (enableHealthChecks) {
    await healthCheckAllProcesses();
    stats.setAutoPersistInterval();
  }
  state = 1 /* READY */;
  await stats.persist();
  if (isDevMode) {
    await reloadFromCache();
  }
}
async function joinOrCreate(roomName, clientOptions = {}, authContext) {
  return await retry(async () => {
    const authData = await callOnAuth(roomName, clientOptions, authContext);
    let room = await findOneRoomAvailable(roomName, clientOptions);
    if (!room) {
      const handler = getHandler(roomName);
      const filterOptions = handler.getFilterOptions(clientOptions);
      const concurrencyKey = getLockId(filterOptions);
      await concurrentJoinOrCreateRoomLock(handler, concurrencyKey, async (roomId) => {
        if (roomId) {
          room = await driver.findOne({ roomId });
        }
        if (!room || room.locked) {
          room = await findOneRoomAvailable(roomName, clientOptions);
        }
        if (!room) {
          room = await createRoom(roomName, clientOptions);
          presence.publish(`concurrent:${handler.name}:${concurrencyKey}`, room.roomId);
        }
        return room;
      });
    }
    return await reserveSeatFor(room, clientOptions, authData);
  }, 5, [SeatReservationError]);
}
async function create(roomName, clientOptions = {}, authContext) {
  const authData = await callOnAuth(roomName, clientOptions, authContext);
  const room = await createRoom(roomName, clientOptions);
  return reserveSeatFor(room, clientOptions, authData);
}
async function join(roomName, clientOptions = {}, authContext) {
  return await retry(async () => {
    const authData = await callOnAuth(roomName, clientOptions, authContext);
    const room = await findOneRoomAvailable(roomName, clientOptions);
    if (!room) {
      throw new ServerError(ErrorCode.MATCHMAKE_INVALID_CRITERIA, `no rooms found with provided criteria`);
    }
    return reserveSeatFor(room, clientOptions, authData);
  });
}
async function reconnect(roomId, clientOptions = {}) {
  const room = await driver.findOne({ roomId });
  if (!room) {
    if (process.env.NODE_ENV !== "production") {
      logger.info(`\u274C room "${roomId}" has been disposed. Did you miss .allowReconnection()?
\u{1F449} https://docs.colyseus.io/server/room/#allowreconnection-client-seconds`);
    }
    throw new ServerError(ErrorCode.MATCHMAKE_INVALID_ROOM_ID, `room "${roomId}" has been disposed.`);
  }
  const reconnectionToken = clientOptions.reconnectionToken;
  if (!reconnectionToken) {
    throw new ServerError(ErrorCode.MATCHMAKE_UNHANDLED, `'reconnectionToken' must be provided for reconnection.`);
  }
  const sessionId = await remoteRoomCall(room.roomId, "checkReconnectionToken", [reconnectionToken]);
  if (sessionId) {
    return { room, sessionId };
  } else {
    if (process.env.NODE_ENV !== "production") {
      logger.info(`\u274C reconnection token invalid or expired. Did you miss .allowReconnection()?
\u{1F449} https://docs.colyseus.io/server/room/#allowreconnection-client-seconds`);
    }
    throw new ServerError(ErrorCode.MATCHMAKE_EXPIRED, `reconnection token invalid or expired.`);
  }
}
async function joinById(roomId, clientOptions = {}, authContext) {
  const room = await driver.findOne({ roomId });
  if (!room) {
    throw new ServerError(ErrorCode.MATCHMAKE_INVALID_ROOM_ID, `room "${roomId}" not found`);
  } else if (room.locked) {
    throw new ServerError(ErrorCode.MATCHMAKE_INVALID_ROOM_ID, `room "${roomId}" is locked`);
  }
  const authData = await callOnAuth(room.name, clientOptions, authContext);
  return reserveSeatFor(room, clientOptions, authData);
}
async function query(conditions = {}, sortOptions) {
  return await driver.query(conditions, sortOptions);
}
async function findOneRoomAvailable(roomName, filterOptions, additionalSortOptions) {
  const handler = getHandler(roomName);
  const sortOptions = Object.assign({}, handler.sortOptions ?? {});
  if (additionalSortOptions) {
    Object.assign(sortOptions, additionalSortOptions);
  }
  return await driver.findOne({
    locked: false,
    name: roomName,
    private: false,
    ...handler.getFilterOptions(filterOptions)
  }, sortOptions);
}
async function remoteRoomCall(roomId, method, args, rejectionTimeout = REMOTE_ROOM_SHORT_TIMEOUT) {
  const room = rooms[roomId];
  if (!room) {
    try {
      return await requestFromIPC(presence, getRoomChannel(roomId), method, args, rejectionTimeout);
    } catch (e) {
      if (method === "_reserveSeat" && e.message === "ipc_timeout") {
        throw e;
      }
      const request = `${method}${args && " with args " + JSON.stringify(args) || ""}`;
      throw new ServerError(
        ErrorCode.MATCHMAKE_UNHANDLED,
        `remote room (${roomId}) timed out, requesting "${request}". (${rejectionTimeout}ms exceeded)`
      );
    }
  } else {
    return !args && typeof room[method] !== "function" ? room[method] : await room[method].apply(room, args && JSON.parse(JSON.stringify(args)));
  }
}
function defineRoomType(roomName, klass, defaultOptions) {
  const registeredHandler = new RegisteredHandler(roomName, klass, defaultOptions);
  handlers[roomName] = registeredHandler;
  if (klass.prototype["onAuth"] !== Room.prototype["onAuth"]) {
    if (klass["onAuth"] !== Room["onAuth"]) {
      logger.info(`\u274C "${roomName}"'s onAuth() defined at the instance level will be ignored.`);
    }
  }
  return registeredHandler;
}
function removeRoomType(roomName) {
  delete handlers[roomName];
}
function hasHandler(roomName) {
  logger.warn("hasHandler() is deprecated. Use getHandler() instead.");
  return handlers[roomName] !== void 0;
}
function getHandler(roomName) {
  const handler = handlers[roomName];
  if (!handler) {
    throw new ServerError(ErrorCode.MATCHMAKE_NO_HANDLER, `provided room name "${roomName}" not defined`);
  }
  return handler;
}
function getRoomClass(roomName) {
  return handlers[roomName]?.klass;
}
async function createRoom(roomName, clientOptions) {
  const selectedProcessId = state === 1 /* READY */ ? await selectProcessIdToCreateRoom(roomName, clientOptions) : processId;
  let room;
  if (selectedProcessId === void 0) {
    if (isDevMode && processId === void 0) {
      await onReady;
      return createRoom(roomName, clientOptions);
    } else {
      throw new ServerError(ErrorCode.MATCHMAKE_UNHANDLED, `no processId available to create room ${roomName}`);
    }
  } else if (selectedProcessId === processId) {
    room = await handleCreateRoom(roomName, clientOptions);
  } else {
    try {
      room = await requestFromIPC(
        presence,
        getProcessChannel(selectedProcessId),
        void 0,
        [roomName, clientOptions],
        REMOTE_ROOM_SHORT_TIMEOUT
      );
    } catch (e) {
      if (e.message === "ipc_timeout") {
        debugAndPrintError(`${e.message}: create room request timed out for ${roomName} on processId ${selectedProcessId}.`);
        if (enableHealthChecks) {
          await stats.excludeProcess(selectedProcessId);
        }
        room = await handleCreateRoom(roomName, clientOptions);
      } else {
        throw e;
      }
    }
  }
  if (isDevMode) {
    presence.hset(getRoomRestoreListKey(), room.roomId, JSON.stringify({
      "clientOptions": clientOptions,
      "roomName": roomName,
      "processId": processId
    }));
  }
  return room;
}
async function handleCreateRoom(roomName, clientOptions, restoringRoomId) {
  const handler = getHandler(roomName);
  const room = new handler.klass();
  if (restoringRoomId && isDevMode) {
    room.roomId = restoringRoomId;
  } else {
    room.roomId = generateId();
  }
  room["__init"]();
  room.roomName = roomName;
  room.presence = presence;
  const additionalListingData = handler.getFilterOptions(clientOptions);
  if (publicAddress) {
    additionalListingData.publicAddress = publicAddress;
  }
  room.listing = driver.createInstance({
    name: roomName,
    processId,
    ...additionalListingData
  });
  if (room.onCreate) {
    try {
      await room.onCreate(merge({}, clientOptions, handler.options));
    } catch (e) {
      debugAndPrintError(e);
      throw new ServerError(
        e.code || ErrorCode.MATCHMAKE_UNHANDLED,
        e.message
      );
    }
  }
  room["_internalState"] = RoomInternalState.CREATED;
  room.listing.roomId = room.roomId;
  room.listing.maxClients = room.maxClients;
  debugMatchMaking("spawning '%s', roomId: %s, processId: %s", roomName, room.roomId, processId);
  stats.local.roomCount++;
  stats.persist();
  room._events.on("lock", lockRoom.bind(this, room));
  room._events.on("unlock", unlockRoom.bind(this, room));
  room._events.on("join", onClientJoinRoom.bind(this, room));
  room._events.on("leave", onClientLeaveRoom.bind(this, room));
  room._events.on("visibility-change", onVisibilityChange.bind(this, room));
  room._events.once("dispose", disposeRoom.bind(this, roomName, room));
  room._events.once("disconnect", () => {
    room._events.removeAllListeners("lock");
    room._events.removeAllListeners("unlock");
    room._events.removeAllListeners("visibility-change");
    room._events.removeAllListeners("dispose");
    if (stats.local.roomCount <= 0) {
      events.emit("no-active-rooms");
    }
  });
  await createRoomReferences(room, true);
  if (state !== 2 /* SHUTTING_DOWN */) {
    await room.listing.save();
  }
  handler.emit("create", room);
  return room.listing;
}
function getRoomById(roomId) {
  return driver.findOne({ roomId });
}
function getLocalRoomById(roomId) {
  return rooms[roomId];
}
function disconnectAll(closeCode) {
  const promises = [];
  for (const roomId in rooms) {
    if (!rooms.hasOwnProperty(roomId)) {
      continue;
    }
    promises.push(rooms[roomId].disconnect(closeCode));
  }
  return promises;
}
async function lockAndDisposeAll() {
  await stats.excludeProcess(processId);
  if (enableHealthChecks) {
    stats.clearAutoPersistInterval();
  }
  const noActiveRooms = new Deferred();
  if (stats.local.roomCount <= 0) {
    noActiveRooms.resolve();
  } else {
    events.once("no-active-rooms", () => noActiveRooms.resolve());
  }
  for (const roomId in rooms) {
    if (!rooms.hasOwnProperty(roomId)) {
      continue;
    }
    const room = rooms[roomId];
    room.lock();
    room.onBeforeShutdown();
  }
  await noActiveRooms;
}
async function gracefullyShutdown() {
  if (state === 2 /* SHUTTING_DOWN */) {
    return Promise.reject("already_shutting_down");
  }
  debugMatchMaking(`${processId} is shutting down!`);
  state = 2 /* SHUTTING_DOWN */;
  onReady = void 0;
  await lockAndDisposeAll();
  if (isDevMode) {
    await cacheRoomHistory(rooms);
  }
  await removeRoomsByProcessId(processId);
  presence.unsubscribe(getProcessChannel());
  return Promise.all(disconnectAll(
    isDevMode ? Protocol.WS_CLOSE_DEVMODE_RESTART : void 0
  ));
}
async function reserveSeatFor(room, options, authData) {
  const sessionId = authData?.sessionId || generateId();
  debugMatchMaking(
    "reserving seat. sessionId: '%s', roomId: '%s', processId: '%s'",
    sessionId,
    room.roomId,
    processId
  );
  let successfulSeatReservation;
  try {
    successfulSeatReservation = await remoteRoomCall(
      room.roomId,
      "_reserveSeat",
      [sessionId, options, authData],
      REMOTE_ROOM_SHORT_TIMEOUT
    );
  } catch (e) {
    debugMatchMaking(e);
    if (e.message === "ipc_timeout" && !(enableHealthChecks && await healthCheckProcessId(room.processId))) {
      throw new SeatReservationError(`process ${room.processId} is not available.`);
    } else {
      successfulSeatReservation = false;
    }
  }
  if (!successfulSeatReservation) {
    throw new SeatReservationError(`${room.roomId} is already full.`);
  }
  const response = { room, sessionId };
  if (isDevMode) {
    response.devMode = isDevMode;
  }
  return response;
}
async function callOnAuth(roomName, clientOptions, authContext) {
  const roomClass = getRoomClass(roomName);
  if (roomClass && roomClass["onAuth"] && roomClass["onAuth"] !== Room["onAuth"]) {
    const result = await roomClass["onAuth"](authContext.token, clientOptions, authContext);
    if (!result) {
      throw new ServerError(ErrorCode.AUTH_FAILED, "onAuth failed");
    }
    return result;
  }
}
async function healthCheckAllProcesses() {
  const allStats = await stats.fetchAll();
  const activeProcessChannels = typeof presence.channels === "function" ? (await presence.channels("p:*")).map((c) => c.substring(2)) : [];
  if (allStats.length > 0) {
    await Promise.all(
      allStats.filter((stat) => stat.processId !== processId && // skip current process
      !activeProcessChannels.includes(stat.processId)).map((stat) => healthCheckProcessId(stat.processId))
    );
  }
}
var _healthCheckByProcessId = {};
function healthCheckProcessId(processId2) {
  if (_healthCheckByProcessId[processId2] !== void 0) {
    return _healthCheckByProcessId[processId2];
  }
  _healthCheckByProcessId[processId2] = new Promise(async (resolve, reject) => {
    logger.debug(`> Performing health-check against processId: '${processId2}'...`);
    try {
      const requestTime = Date.now();
      await requestFromIPC(
        presence,
        getProcessChannel(processId2),
        "healthcheck",
        [],
        REMOTE_ROOM_SHORT_TIMEOUT
      );
      logger.debug(`\u2705 Process '${processId2}' successfully responded (${Date.now() - requestTime}ms)`);
      resolve(true);
    } catch (e) {
      logger.debug(`\u274C Process '${processId2}' failed to respond. Cleaning it up.`);
      const isProcessExcluded = await stats.excludeProcess(processId2);
      if (isProcessExcluded && !isDevMode) {
        await removeRoomsByProcessId(processId2);
      }
      resolve(false);
    } finally {
      delete _healthCheckByProcessId[processId2];
    }
  });
  return _healthCheckByProcessId[processId2];
}
async function removeRoomsByProcessId(processId2) {
  await driver.cleanup(processId2);
}
async function createRoomReferences(room, init = false) {
  rooms[room.roomId] = room;
  if (init) {
    await subscribeIPC(
      presence,
      getRoomChannel(room.roomId),
      (method, args) => {
        return !args && typeof room[method] !== "function" ? room[method] : room[method].apply(room, args);
      }
    );
  }
  return true;
}
async function concurrentJoinOrCreateRoomLock(handler, concurrencyKey, callback) {
  return new Promise(async (resolve, reject) => {
    const hkey = getConcurrencyHashKey(handler.name);
    const concurrency = await presence.hincrbyex(
      hkey,
      concurrencyKey,
      1,
      // increment by 1
      MAX_CONCURRENT_CREATE_ROOM_WAIT_TIME * 2
      // expire in 2x the time of MAX_CONCURRENT_CREATE_ROOM_WAIT_TIME
    ) - 1;
    const fulfill = async (roomId) => {
      try {
        resolve(await callback(roomId));
      } catch (e) {
        reject(e);
      } finally {
        await presence.hincrbyex(hkey, concurrencyKey, -1, MAX_CONCURRENT_CREATE_ROOM_WAIT_TIME * 2);
      }
    };
    if (concurrency > 0) {
      debugMatchMaking(
        "receiving %d concurrent joinOrCreate for '%s' (%s)",
        concurrency,
        handler.name,
        concurrencyKey
      );
      try {
        const roomId = await subscribeWithTimeout(
          presence,
          `concurrent:${handler.name}:${concurrencyKey}`,
          (MAX_CONCURRENT_CREATE_ROOM_WAIT_TIME + Math.min(concurrency, 3) * 0.2) * 1e3
          // convert to milliseconds
        );
        return await fulfill(roomId);
      } catch (error) {
      }
    }
    return await fulfill();
  });
}
function onClientJoinRoom(room, client) {
  stats.local.ccu++;
  stats.persist();
  handlers[room.roomName].emit("join", room, client);
}
function onClientLeaveRoom(room, client, willDispose) {
  stats.local.ccu--;
  stats.persist();
  handlers[room.roomName].emit("leave", room, client, willDispose);
}
function lockRoom(room) {
  handlers[room.roomName].emit("lock", room);
}
async function unlockRoom(room) {
  if (await createRoomReferences(room)) {
    handlers[room.roomName].emit("unlock", room);
  }
}
function onVisibilityChange(room, isInvisible) {
  handlers[room.roomName].emit("visibility-change", room, isInvisible);
}
async function disposeRoom(roomName, room) {
  debugMatchMaking("disposing '%s' (%s) on processId '%s' (graceful shutdown: %s)", roomName, room.roomId, processId, state === 2 /* SHUTTING_DOWN */);
  room.listing.remove();
  stats.local.roomCount--;
  if (state !== 2 /* SHUTTING_DOWN */) {
    stats.persist();
    if (isDevMode) {
      await presence.hdel(getRoomRestoreListKey(), room.roomId);
    }
  }
  handlers[roomName].emit("dispose", room);
  presence.unsubscribe(getRoomChannel(room.roomId));
  delete rooms[room.roomId];
}
function getRoomChannel(roomId) {
  return `$${roomId}`;
}
function getConcurrencyHashKey(roomName) {
  return `ch:${roomName}`;
}
function getProcessChannel(id = processId) {
  return `p:${id}`;
}
export {
  MatchMakerState,
  accept,
  controller,
  create,
  createRoom,
  defineRoomType,
  disconnectAll,
  driver,
  findOneRoomAvailable,
  getHandler,
  getLocalRoomById,
  getRoomById,
  getRoomClass,
  gracefullyShutdown,
  handleCreateRoom,
  hasHandler,
  healthCheckAllProcesses,
  healthCheckProcessId,
  join,
  joinById,
  joinOrCreate,
  onReady,
  presence,
  processId,
  publicAddress,
  query,
  reconnect,
  remoteRoomCall,
  removeRoomType,
  reserveSeatFor,
  selectProcessIdToCreateRoom,
  setHealthChecksEnabled,
  setup,
  state,
  stats
};