Nodejs实现多房间简易聊天室功能

const
  socketio=require('socket.io');
var io,
  guestNumber=1, //用户编号
  nickNames={},  //socket id对应的nickname
  namesUsed={},  //所有已使用的nickname
  allRooms={},  //聊天室--人数
  currentRoom={}; //sockid--聊天室
module.exports.listen=function(server){
  io=socketio.listen(server);
  io.serveClient('log level',1);
  io.sockets.on('connection',function(socket){
    guestNumber=assignGuestName(socket,guestNumber,nickNames);
    joinRoom(socket,'Lobby');
    handleMessageBroadcasting(socket,nickNames);
    handleNameChangeAttempts(socket,nickNames,namesUsed);
    handleRoomJoining(socket);
    socket.on('rooms',function(){
      socket.emit('rooms',JSON.stringify(allRooms));
    });
    handleClientDisconnection(socket,nickNames,namesUsed);
  });
};
//新socket连入，自动分配一个昵称
function assignGuestName(socket,guesetNumber,nickNames){
  var name='Guest'+guestNumber;
  nickNames[socket.id]=name;
  socket.emit('nameResult',{
    success:true,
    name:name
  });
  namesUsed[name]=1;
  return guestNumber+1;
}
//加入某个聊天室
function joinRoom(socket,room){
  socket.join(room);
  var num=allRooms[room];
  if(num===undefined){
    allRooms[room]=1;
  }else{
    allRooms[room]=num+1;
  }
  currentRoom[socket.id]=room;
  socket.emit('joinResult',{room:room});
  socket.broadcast.to(room).emit('message',{
    text:nickNames[socket.id]+' has join '+room+'.'
  });
  var usersinRoom=io.sockets.adapter.rooms[room];
  if(usersinRoom.length>1){
    var usersInRoomSummary='Users currently in '+room+' : ';
    for(var index in usersinRoom.sockets){
      if(index!=socket.id){
        usersInRoomSummary+=nickNames[index]+',';
      }
    }
    socket.emit('message',{text:usersInRoomSummary});
  }
}
//修改昵称
function handleNameChangeAttempts(socket,nickNames,namesUsed){
  socket.on('nameAttempt',function(name){
    if(name.indexOf('Guest')==0){
      socket.emit('nameResult',{
        success:false,
        message:'Names cannot begin with "Guest".'
      });
    }else{
      if(namesUsed[name]==undefined){
        var previousName=nickNames[socket.id];
        delete namesUsed[previousName];
        namesUsed[name]=1;
        nickNames[socket.id]=name;
        socket.emit('nameResult',{
          success:true,
          name:name
        });
        socket.broadcast.to(currentRoom[socket.id]).emit('message',{
          text:previousName+' is now known as '+name+'.'
        });
      }else{
        socket.emit('nameResult',{
          success:false,
          message:'That name is already in use.'
        });
      }								 
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