How to implement chat function using nodejs

This article mainly introduces nodejs to simply implement the chat function of TCP server and client. It analyzes the specific steps and related operation skills of the chat program client and server based on nodejs based on TCP protocol in the form of examples. The code is relatively Detailed comments are easy to understand. Friends in need can refer to

. This article describes how nodejs simply implements the chat function of TCP server and client. Share it with everyone for your reference, the details are as follows:

Server side

var net = require('net');
var server = net.createServer();
//聚合所有客户端
var sockets = [];
//接受新的客户端连接
server.on('connection', function(socket){
  console.log('got a new connection');
  sockets.push(socket);
  //从连接中读取数据
  socket.on('data', function(data){
    console.log('got data:', data);
    //广播数据
    //每当一个已连接的用户输入数据，就将这些数据广播给其他所有已连接的用户
    sockets.forEach(function(otherSocket){
      if (otherSocket !== socket){
        otherSocket.write(data);
      }
    });
    //删除被关闭的连接
    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);

Client side

var net = require('net');
var port = 4000;
var quitting = false;
var conn;
var retryTimeout = 3000;  //三秒，定义三秒后重新连接
var retriedTimes = 0;  //记录重新连接的次数
var maxRetries = 10;  //最多重新连接十次
process.stdin.resume(); //process.stdin流来接受用户的键盘输入，这个可读流初始化时处于暂停状态，调用流上的resume()方法来恢复流
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);
  }
});
//连接时设置最多连接十次，并且开启定时器三秒后再连接
(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});
})();

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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