server/ws.js


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var server = require('socket.io')

var ws = module.exports = {}

var rooms = {}

ws.listen = function(app){
  ws.io = server(app)
}
ws.add = function(name){
  if (name in rooms) { return }
  var room = rooms[name] = {}
  var messages = room.messages = []
  room.users = {}
  sockets = {}
  console.log("new room >> " + name)
  
  var ns = ws.io.of('/' + name)
  
  ns.on('connection', function(socket){
    
    var nick
  
    socket.on('join', function(data){
      nick = data.nick
      if (sockets[nick]) {
        // already connected?
        sockets[nick].disconnect()
        sockets[nick] = socket
        room.users[nick] = true
        socket.emit("welcome", room)
        ns.emit('joined', data)
      }
    })
    
    socket.on('message', function(data){
      if (messages.length > 20) { messages.shift() }
      messages.push(data)
      ns.emit('message', data)
    })
    
    socket.on('disconnect', function(){
      delete sockets[nick]
      delete room.users[nick]
      ns.emit('parted', {nick:nick})
    })

  })
}