var net = require('net');
var server = net.createServer();
//聚合所有客戶端
var sockets = [];
//接受新的客戶端連接
server.on('connection', function(socket){
  console.log('got a new connection');
  sockets.push(socket);
  //從連接中讀取數(shù)據(jù)
  socket.on('data', function(data){
    console.log('got data:', data);
    //廣播數(shù)據(jù)
    //每當一個已連接的用戶輸入數(shù)據(jù)，就將這些數(shù)據(jù)廣播給其他所有已連接的用戶
    sockets.forEach(function(otherSocket){
      if (otherSocket !== socket){
        otherSocket.write(data);
      }
    });
    //刪除被關閉的連接
    socket.on('close', function(){
      console.log('connection closed');
      var index = sockets.indexOf(socket);
      sockets.splice(index, 1);
    });
  });
});
server.on('error', function(err){
  console.log('Server error:', err.message);
});
server.on('close', function(){
  console.log('Server closed');
});
server.listen(4000);

var net = require('net');
var port = 4000;
var quitting = false;
var conn;
var retryTimeout = 3000;  //三秒，定義三秒后重新連接
var retriedTimes = 0;  //記錄重新連接的次數(shù)
var maxRetries = 10;  //最多重新連接十次
process.stdin.resume(); //process.stdin流來接受用戶的鍵盤輸入，這個可讀流初始化時處于暫停狀態(tài)，調(diào)用流上的resume()方法來恢復流
process.stdin.on('data', function(data){
  if (data.toString().trim().toLowerCase() === 'quit'){
    quitting = true;
    console.log('quitting');
    conn.end();
    process.stdin.pause();
  } else {
    conn.write(data);
  }
});
//連接時設置最多連接十次，并且開啟定時器三秒后再連接
(function connect() {
  function reconnect() {
    if (retriedTimes >= maxRetries) {
      throw new Error('Max retries have been exceeded, I give up.');
    }
    retriedTimes +=1;
    setTimeout(connect, retryTimeout);
  }
  conn = net.createConnection(port);
  conn.on('connect', function() {
    retriedTimes = 0;
    console.log('connect to server');
  });
  conn.on('error', function(err) {
    console.log('Error in connection:', err);
  });
  conn.on('close', function() {
    if(! quitting) {
      console.log('connection got closed, will try to reconnect');
      reconnect();
    }
  });
  //打印
  conn.pipe(process.stdout, {end: false});
})();