Function handleJoinLobbyEvent

Extensions/Multiplayer/multiplayertools.ts:504–698

(
      runtimeScene: gdjs.RuntimeScene,
      lobbyId: string
    )

    };

    const handleJoinLobbyEvent = function (
      runtimeScene: gdjs.RuntimeScene,
      lobbyId: string
    ) {
      if (_connectionId) {
        logger.info('Already connected to a lobby.');
        return;
      }

      if (_websocket) {
        logger.warn('Already connected to a lobby. Closing the previous one.');
        _websocket.close();
        _connectionId = null;
        playerNumber = null;
        hostPeerId = null;
        _lobbyId = null;
        _websocket = null;
      }

      const gameId = gdjs.projectData.properties.projectUuid;
      const playerId = gdjs.playerAuthentication.getUserId();
      const playerToken = gdjs.playerAuthentication.getUserToken();
      if (!gameId) {
        logger.error('Cannot open lobbies if the project has no ID.');
        return;
      }
      if (!playerId || !playerToken) {
        logger.warn('Cannot open lobbies if the player is not connected.');
        return;
      }
      const wsPlayApi = isUsingGDevelopDevelopmentEnvironment
        ? 'wss://api-ws-dev.gdevelop.io/play'
        : 'wss://api-ws.gdevelop.io/play';

      const wsUrl = new URL(wsPlayApi);
      wsUrl.searchParams.set('gameId', gameId);
      wsUrl.searchParams.set('lobbyId', lobbyId);
      wsUrl.searchParams.set('playerId', playerId);
      wsUrl.searchParams.set('connectionType', 'lobby');
      wsUrl.searchParams.set('playerGameToken', playerToken);
      _websocket = new WebSocket(wsUrl.toString());
      _websocket.onopen = () => {
        logger.info('Connected to the lobby.');
        // Register a heartbeat to keep the connection alive.
        _websocketHeartbeatIntervalFunction = setInterval(() => {
          if (_websocket) {
            _websocket.send(
              JSON.stringify({
                action: 'heartbeat',
                connectionType: 'lobby',
              })
            );
          }
        }, DEFAULT_WEBSOCKET_HEARTBEAT_INTERVAL);

        // When socket is open, ask for the connectionId and send more session info, so that we can inform the lobbies window.
        if (_websocket) {
          _websocket.send(JSON.stringify({ action: 'getConnectionId' }));