How Swoole implements a high-performance TCP proxy server

With the continuous development of the Internet, the role of TCP proxy servers has become more and more important. As a high-performance asynchronous network communication framework developed based on PHP, Swoole has great advantages in implementing TCP proxy servers. This article will introduce how Swoole implements a high-performance TCP proxy server.

1. What is TCP proxy server

TCP proxy server is a network communication method. Its main function is to establish a proxy between the client and the server, so that the client and server can Communication between them can be forwarded through proxies. TCP proxy servers can usually achieve the following functions:

1. Port mapping: connect the client to the server in the private network.

2. Browser proxy: forward HTTP(S) traffic to other servers.

3. Load balancing: Connect the client to a server in a group of servers.

2. How Swoole implements TCP proxy server

1. Asynchronous network communication capabilities provided by Swoole

Swoole is a high-performance asynchronous network communication framework developed based on PHP language , which provides many asynchronous network communication functions, such as TCP, UDP, Unix Socket, etc., through which TCP proxy servers can be easily implemented.

2. Overall design of TCP proxy server

The main idea of ​​Swoole to implement TCP proxy server is to first establish a listening port of the server, wait for the client's connection, and then receive the client's request before sending the request Forwarded to target server. Among them, it is important to note that communication between the client and the server is implemented in an asynchronous and non-blocking manner to avoid problems such as blocking in high concurrency situations.

3. TCP proxy server implementation steps

(1) Establish a server listening port:

$serv = new swoole_server("0.0.0.0", 9502, SWOOLE_PROCESS, SWOOLE_SOCK_TCP);

(2) Listen for events on the service port

$serv->on('connect', function ($serv, $fd) {
    echo "Client: Connect.
";
});

$serv->on('receive', function ($serv, $fd, $from_id, $data) {
    //TODO: 将请求转发到目标服务器
});

$serv->on('close', function ($serv, $fd) {
    echo "Client: Close.
";
});

(3) Establish a connection with the target server and implement data forwarding

$client = new swoole_client(SWOOLE_SOCK_TCP, SWOOLE_SOCK_ASYNC);

$client->on("connect", function(swoole_client $cli) {
    $cli->send("hello world
");
});

$client->on("receive", function(swoole_client $cli, $data){
    echo "Receive: $data";
});

$client->on("error", function(swoole_client $cli){
    echo "Connect Error
";
});

$client->on("close", function(swoole_client $cli){
    echo "Connection Close
";
});

$client->connect('127.0.0.1', 9502);

(4) Implement the deployment of TCP proxy server

After implementing the TCP proxy server, you need to consider how to deploy this server so that Clients can connect to it. You can use the daemon process mode or system service mode provided by Swoole.

3. Summary

Through the introduction of this article, we can see that Swoole, as a high-performance asynchronous network communication framework based on PHP language, has great potential in implementing TCP proxy servers. Advantage. When developing and deploying a TCP proxy server, you need to pay attention to requirements in terms of concurrency performance, stability, and security to ensure that the TCP proxy server can meet actual business needs.

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