How to use Swoole to implement TCP long connection server

With the continuous development of network technology, TCP long connection technology is becoming more and more popular. Among many solutions, Swoole is an excellent choice. This article will briefly introduce how to use Swoole to implement a TCP long connection server and give specific code examples.

1. Basic knowledge of Swoole

Swoole is a high-performance network communication framework that supports asynchronous TCP, UDP, Unix Socket, HTTP, WebSocket and other protocols, and can be widely used on the Internet. , data communication and high-concurrency server development in the fields of mobile communications, Internet of Things, cloud computing and other fields. Swoole's powerful performance comes from the asynchronous, coroutine, multi-threading and other technologies provided by its underlying layer, making it better able to support high-concurrency and high-load scenarios compared to other technical solutions.

Before starting to implement the TCP long connection server, we need to understand some basic Swoole knowledge.

1. The basic usage process of Swoole:

(1) Create a server object;

(2) Register the corresponding event processing function;

(3) Start the server.

2. Swoole's process model:

Swoole processes are divided into three categories: master process, manager process and worker sub-process.

(1) Master main process: Responsible for managing the manager process and worker process. The main work includes starting, closing, restarting the process, and monitoring the exit events of the worker process.

(2) Manager process: Responsible for managing worker processes. Its main job is to manage the number of worker processes, load balancing, process restart, etc.

(3) Worker sub-process: Responsible for processing requests. The main work includes receiving client connections, processing requests, sending responses, etc.

3. Swoole's event callback function:

Swoole has a variety of event callback functions, the following are some commonly used ones:

(1) onStart: when the Master process starts trigger.

(2)onManagerStart: Triggered when the manager process starts.

(3)onWorkerStart: Triggered when the worker process starts.

(4) onConnect: Triggered when the client connects.

(5) onReceive: Triggered when a client request is received.

(6) onClose: Triggered when the client closes the connection.

4. Swoole configuration items:

Swoole has many configuration items, the following are some commonly used ones:

(1) reactor_num: Set the number of Reactor threads.

(2) worker_num: Set the number of Worker processes.

(3) max_request: Set the maximum number of requests processed by the worker process. After exceeding this value, the worker will automatically exit to prevent process memory leaks.

(4) dispatch_mode: Set the load balancing mode of the Worker process, supporting 5 modes.

(5) task_worker_num: Set the number of task process.

(6) task_ipc_mode: Set the mode of communication between tasks.

2. Implementation of TCP long connection server

Let’s implement a simple TCP long connection server step by step.

1. Create server object

$server = new SwooleServer('127.0.0.1', 9501);

2. Register event callback function

//当客户端连接时触发的回调函数
$server->on('connect', function ($server, $fd) {});

//当接收到客户端数据时触发的回调函数
$server->on('receive', function ($server, $fd, $from_id, $data) {});

//当客户端断开连接时触发的回调函数
$server->on('close', function ($server, $fd) {});

3. Start the server

$server->start();

4. Complete code example

on('connect', function ($server, $fd) {
    echo "client {$fd} connect
";
});

//当接收到客户端数据时触发的回调函数
$server->on('receive', function ($server, $fd, $from_id, $data) {
    $server->send($fd, 'hello,world');
});

//当客户端断开连接时触发的回调函数
$server->on('close', function ($server, $fd) {
    echo "client {$fd} close
";
});

$server->start();

In the above code, we create a server object located at the 127.0.0.1:9501 address, and then register connect, receive,closeThree event callback functions, and finally the server is started.

In the connect event, we printed the client connection information. In the receive event, we sent a hello,world The string is given to the client. In the close event, we print the information that the client closed the connection.

You can connect to the server through tools such as telnet and test whether its functions are normal. It should be noted when testing that because it is a long TCP connection, the connection needs to be closed manually, otherwise the server will keep the connection.

3. Summary

This article briefly introduces how to use Swoole to implement TCP long connection server, and gives a complete code example. In actual development, the code can be modified and expanded according to needs to achieve more flexible and efficient network communication. At the same time, there is still a lot to learn and understand deeply about the use of Swoole. I hope readers can practice and explore more to improve their technical level.

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