Swoole implements high-performance RPC server

In recent years, with the continuous development of network applications, more and more applications need to implement the function of Remote Procedure Call (RPC). Traditional RPC frameworks such as Dubbo, Thrift, gRPC, etc. can meet this demand. However, with the increase of applications and businesses, performance problems have become more and more obvious. In order to solve these problems, the open source community launched a high-performance RPC server based on PHP language-Swoole.

Swoole is an asynchronous, parallel, high-performance network communication framework developed based on the PHP language, allowing PHP programs to process network requests more efficiently. The RPC server is a component of Swoole. It provides a remote procedure calling method based on the TCP protocol, supports asynchronous I/O, coroutines, process management and other features, and can easily implement high-performance, high-concurrency RPC services.

Next, we will introduce how to use Swoole to implement a high-performance RPC server.

Install the Swoole extension

Before we begin, we need to install the Swoole extension first. Since Swoole relies on the underlying C extension of PHP, you need to install the C compiler and Swoole's dependent libraries first.

yum install -y gcc 
    automake 
    autoconf 
    libtool 
    make 
    php-devel 
    php-pear 
    pcre-devel 
    openssl-devel

After installing the dependent libraries, we can use the pecl command to install the Swoole extension:

pecl install swoole

After the installation is complete, we need to add the following lines to the php.ini file to enable the Swoole extension:

extension=swoole.so

Implementing the RPC server

After installing the Swoole extension, we can start to implement the RPC server. Here we will use PHP's reflection mechanism to implement automated service registration, and Swoole's coroutine to handle asynchronous I/O.

Create service class

First, we need to create a service class to expose methods for remote calls. In this class, we can define multiple methods and use PHP's DocBlock to mark the parameters and return value types of the methods to automatically generate documentation and code tips.

/**
 * @method string hello(string $name)
 */
class MyService
{
    public function hello(string $name): string
    {
        return "Hello, $name!";
    }
}

In the above code, we define a MyService class, which contains a method named hello, which receives a string type parameter $name and returns a string type data.

Create RPC server

Next, we need to implement the RPC server to receive the client's request and call the corresponding method in the service class to process the request.

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

/**
 * 注册服务
 */
$server->set([
    'worker_num' => 1,
    'dispatch_mode' => 1,
]);
$myService = new MyService();
$methods = get_class_methods($myService);
$availableMethods = [];
foreach ($methods as $method) {
    // 忽略 __* 类型的方法，私有方法和构造方法
    if (!preg_match('/^__|^get[A-Z]/i', $method) && is_callable([$myService, $method])) {
        $availableMethods[] = $method;
    }
}
$server->on('WorkerStart', function () use ($availableMethods, $myService) {
    // 打开协程支持
    SwooleRuntime::enableCoroutine();
    $service = new HproseSwooleSocketService();
    foreach ($availableMethods as $method) {
        $service->addFunction([$myService, $method], $method);
    }
    $server = new HproseSwooleSocketServer('tcp://0.0.0.0:9501');

    //监听 RPC 请求
    $coroutine = new SwooleCoroutineHttpClient();
    $coroutine->setHeaders([
        'Content-Type' => 'text/plain',
    ]);

    while (true) {
        $socket = $server->accept();
        if ($socket !== false) {
            $socket->setOption(['open_length_check' => 1]);
            $socket->setOption(['package_length_type' => 'N']);
            $socket->setOption(['package_length_offset' => 0]);
            $socket->setOption(['package_body_offset' => 4]);
            $socket->start();
            $client = new SwooleCoroutineClient(SWOOLE_SOCK_TCP);
            $client->connect('127.0.0.1', 9502);
            $client->send($socket->recv());
            $out = $client->recv();
            $socket->send($out);
            $socket->close();
        }
    }
});
$server->start();

In the above code, we created a $server object, which listens to the 127.0.0.1:9501 address and port, using the SWOOLE_PROCESS process mode and SWOOLE_SOCK_TCP protocol.

After the server is started, we use PHP's reflection mechanism to obtain all callable methods in the service class. Then, we use Swoole's coroutine to listen for RPC requests and handle the requests by calling methods of the service class. During the implementation process, we used the third-party library Hprose, which provides a simple and clear way to implement RPC services and is very convenient to use.

Create client

Finally, we need to create a client to request the RPC service. In this example, we can use the Client class that comes with Hprose to achieve this.

$client = new HproseHttpClient('http://127.0.0.1:9501/', false);
echo $client->hello('Swoole');

In the above code, we create an Hprose HTTP client object and call the hello method in the service class to initiate a request to the RPC server.

Summary

Swoole is a powerful network communication framework that provides many asynchronous, parallel, and high-performance features that can greatly improve the processing capabilities of PHP programs. By studying the content in this article, we can implement a high-performance, high-concurrency RPC server and improve the processing and operating efficiency of PHP programs.

The above is the detailed content of Swoole implements high-performance RPC server. For more information, please follow other related articles on the PHP Chinese website!