Socket.io connection manager

socketManager.js

module.exports = function(io, http) {
  const channelSpecificMessageTypes = ['agent joined', 'channel message', 'customer message', 'agent message'];

  io.on('connection', function(socket){
    console.log('a user connected');
    socket.on('chat message', function(msg){
      console.log('socketMgr: chat message: ' + msg);
      io.emit('chat message', msg);
    });

    channelSpecificMessageTypes.forEach(function(msgType) {
      socket.on(msgType, function(msg){
        console.log('socketMgr: got msgType = ' + msgType + 'in room: ' + socket.room);
        if (socket.room !== undefined) {
          io.sockets.in(socket.room).emit(msgType, msg);
        }
      });
    });

    socket.on('join channel', function(msg){
      console.log("joining channel " + msg);
      socket.room = msg;
      socket.join(msg);
    });

    socket.on('leave channel', function(msg){
      socket.leave(msg);
      socket.room = null;
    });

    socket.on('disconnect', function(){
      console.log('user disconnected');
      socket.room = null;
    });
  });

  http.listen(3000, function(){
    console.log('listening on *:3000');
  });
}