Chat server and client v2

client.js

var net = require('net');
var socket = new net.Socket();
var port = 5000;
var host = "127.0.0.1";
var readline = require('readline');

var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

rl.setPrompt("comando>");

socket.connect(port, host, function(){  
  rl.prompt();
});

socket.setEncoding("utf8");

socket.on('data', function(data){  
  console.log("respuesta>", data);     
  rl.prompt();
});

rl.on('line', function(line){
  socket.write(line);
});

server.js

var net = require('net');
var port = 5000;
var protocolCommands = ['nick', 'broadcast', 'chat', 'list'];
var util = require('util');

var listClients = [];

var server = net.createServer(function(client){
  client.setEncoding("utf8");

  processNewClientConnection(client);

  client.on('data', function(data){
    var parts = data.split(":");
    var command = parts[0];
    if(protocolCommands.indexOf(command) != -1){
      var message = parts[1];
      for(var i = 2; i < parts.length; i++){
        message += (":" + parts[i]);
      }
      client.emit(command, message);
      return;
    }
    client.emit('messageError', command);
    //handle the error
  });

  client.on('error', function(err){
    console.log("error de comunicación con el cliente", err);        
  });

  client.on('close', function(){      
    removeClient(client.id);
    var message = util.format("internal:El usuario %s se desconectó", client.id);
    listClients.forEach(function(sc){
      sc.write(message);
    });
  });

  function removeClient(id){    
    var pos = -1;
    for(var i = 0; i < listClients.length; i++){
      var sc = listClients[i];
      if(sc.id == id){
        pos = i;
        break;
      }
    }    
    if(pos != -1){
      console.log("size", listClients.length);
      listClients.splice(pos, 1);
      console.log("size", listClients.length);
    }
  }

  client.on('list', function(){
    var names = [];
    listClients.forEach(function(cs){
      names.push(cs.id);
    });
    var message = util.format("list:%s", names.join(','));
    client.write(message);
  });

  client.on('nick', function(nick){
    var oldNick = client.id;
    client.id = nick;
    var message = util.format("changeNick:%s:%s", oldNick, nick);
    client.write(message);
  });

  client.on('messageError', function(command){
    var message = util.format("error:El comando %s no es válido", command);
    client.write(message);
  });

  client.on('broadcast', function(broadcastMessage){
    var message = util.format("broadcast:%s:%s", client.id, broadcastMessage);
    listClients.forEach(function(sc){
      sc.write(message);
    });
  });

  client.on('chat', function(chatMessage){
    var parts = chatMessage.split(':'),
      user = parts[0],
      msg = parts[1];

    var message = util.format("chatFrom:%s:%s", client.id, msg);
    for(var i = 0; i < listClients.length; i++){
      if(listClients[i].id == user){
        listClients[i].write(message);
        break;
      }
    }
  });

});

server.listen(port);

server.on('error', function(err){
  console.log("error del servidor", err);
});

function processNewClientConnection(client){
  var newID = randomID(8);
  client.id = newID;
  listClients.push(client);

  var message = "internal:Saludos";
  client.write(message);

  var notification = util.format("internal:Se conecto el usuario %s", newID);
  for(var i = 0; i < listClients.length; i++){
    if(listClients[i].id != newID){
      listClients[i].write(notification);
    }
  }
}

function randomID(size){
  var id = "";
  var characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
  var n = characters.length;
  for(var i = 0; i < size; i++){
    var r = Math.ceil(Math.random() * 100) % n;
    id += characters[r];
  }
  return id;
}


setInterval(function(){
  console.log("total de clientes conectactos", listClients.length);
}, 5000);