客户端上的节点网络套接字超时错误

Question

这是我在 IBM Bluemix 上托管的服务器端代码，

const net = require('net');
const server = net.createServer((c) => { //'connection' listener
  console.log('client connected');
  c.on('end', () => {
    console.log('client disconnected');
  });
  c.write('hello\r\n');
  c.pipe(c);
});
server.listen(8124, () => { //'listening' listener
  console.log('server bound');
});

我在本地使用下面的代码作为客户端，

var net = require('net');

var HOST = 'xxx.xx.xx.xx';
var PORT = xxxx;

var client = new net.Socket();
client.connect(PORT, HOST, function() {

    console.log('CONNECTED TO: ' + HOST + ':' + PORT);
    // Write a message to the socket as soon as the client is connected, the server will receive it as message from the client
    client.write('I am Chuck Norris!');

});

// Add a 'data' event handler for the client socket
// data is what the server sent to this socket
client.on('data', function(data) {

    console.log('DATA: ' + data);
    // Close the client socket completely
    client.destroy();

});

// Add a 'close' event handler for the client socket
client.on('close', function() {
    console.log('Connection closed');
});

当我运行时，它会抛出错误。

events.js:141 投掷者； // 未处理的“错误”事件 ^

错误：连接 ETIMEDOUT xxx.xx.xx.xx:xxxx 在 Object.exports._errnoException (util.js:856:11) 在exports._exceptionWithHostPort (util.js:879:20) 在 TCPConnectWrap.afterConnect [as oncomplete] (net.js:1063:14) vivek@vivek-Latitude-E6220:/var/www/html/test/NODE/net$ 节点 client.js 事件.js:141 投掷者； // 未处理的“错误”事件 ^

错误：连接 ETIMEDOUT xxxx.xx.xx.xx:xxxx 在 Object.exports._errnoException (util.js:856:11) 在exports._exceptionWithHostPort (util.js:879:20) 在 TCPConnectWrap.afterConnect [as oncomplete] (net.js:1063:14)

当我在本地运行服务器代码时，它运行良好。请帮我找出错误。

Answer 1

您需要侦听 Bluemix 为您的应用程序分配的端口。 Bluemix 将为您的应用程序分配一个端口，您需要在该端口上进行绑定。 Bluemix 将对您的应用程序进行负载平衡，并使您的应用程序在端口443 和80 上可用。

您可以使用以下代码获取端口。

var port = process.env.PORT || 8124;

您也不需要绑定到主机。

我在下面修改了你的代码。

const net = require('net');
const server = net.createServer((c) => { //'connection' listener
  console.log('client connected');
  c.on('end', () => {
    console.log('client disconnected');
  });
  c.write('hello\r\n');
  c.pipe(c);
});
var port = process.env.PORT || 8124;
server.listen(port, () => { //'listening' listener
  console.log('server bound');
});

Answer 2

当客户端销毁套接字时，您的服务器中出现read ECONNRESET 错误。

你可以使用

c.on('error', function(err) {
    console.log('SOCKET  ERROR : ' , err);
});

您可以通过这种方式避免崩溃。

我的工作版本，基于你的代码

server.js

const net = require('net');

var server = net.createServer(function(c) {
      console.log('client connected');
      c.on('end', function(c) {
        console.log('sendHomeKeytoIosDevice : ERROR : ' + c);
      });
      c.on('error', function(err) {
        console.log('sendHomeKeytoIosDevice : ERROR : ' + err);
      });
      c.write('hello\r\n');
      c.pipe(c);
});


server.listen(8124,function() {
  console.log('server bound');
});

客户端.js

var net = require('net');

var HOST = 'localhost';
var PORT = 8124;

var client = new net.Socket();
client.connect(PORT, HOST, function() {

    console.log('CONNECTED TO: ' + HOST + ':' + PORT);
    // Write a message to the socket as soon as the client is connected, the server will receive it as message from the client
    client.write('I am Chuck Norris!');

});

// Add a 'data' event handler for the client socket
// data is what the server sent to this socket
client.on('data', function(data) {

    console.log('DATA: ' + data);
    // Close the client socket completely
    client.destroy();

});

// Add a 'close' event handler for the client socket
client.on('close', function() {
    console.log('Connection closed');
});