How to use coroutines to implement highly concurrent swoole_ftp_size function in Swoole

Swoole is a high-performance network communication framework developed based on PHP language. It provides asynchronous, high-concurrency, coroutine and other features, which can greatly improve the performance and stability of applications. Among them, coroutine is an important feature of Swoole, which can effectively solve the performance bottleneck problem in high concurrency scenarios. This article will introduce how to use Swoole coroutine to implement the highly concurrent swoole_ftp_size function.

1. Introduction to Swoole FTP component

Swoole provides the FTP component. The swoole_ftp_connect function can be used to connect to the FTP server. The swoole_ftp_login function can log in to the FTP server. The swoole_ftp_rawlist function can obtain the files in a directory of the FTP server. File list, the swoole_ftp_size function can obtain the size of a file on the FTP server, etc. This article focuses on how to use Swoole coroutine to implement the highly concurrent swoole_ftp_size function.

2. Problems with traditional implementation methods

In the traditional implementation method, each time the swoole_ftp_size function is called, a request needs to be sent to the FTP server to obtain file size information. In high-concurrency scenarios, frequent IO operations will cause increased system load and poor performance. In order to solve this problem, you can use Swoole's coroutine feature to implement asynchronous requests and reduce IO operations.

3. Use coroutine to optimize the swoole_ftp_size function

When using coroutine to optimize the swoole_ftp_size function, you need to use Swoole's coroutine API, such as swoole_client_select function, swoole_coroutine_create function, swoole_coroutine_wait function, etc. The following are the specific steps:

1. Create a coroutine client

Use the swoole_coroutine_create function to create a coroutine client, connect to the FTP server and log in. The code example is as follows:

$cli = new SwooleCoroutineClient(SWOOLE_SOCK_TCP);
$cli->connect('127.0.0.1', 21);
$res = $cli->recv();
$cli->send("USER username
");
$res = $cli->recv();
$cli->send("PASS password
");
$res = $cli->recv();

2. Send an asynchronous request

Use the swoole_client_select function to send an asynchronous request and obtain file size information. The code example is as follows:

$cli->send("SIZE filename
");
swoole_client_select([$cli]);
$res = $cli->recv();
$size = (int) explode(' ', $res)[1];

3. Synchronously wait for the coroutine to return Value

Use the swoole_coroutine_wait function to synchronously wait for the return value of the coroutine. The code example is as follows:

go(function () use ($cli) {
    $cli->send("SIZE filename
");
    swoole_client_select([$cli]);
    $res = $cli->recv();
    $size = (int) explode(' ', $res)[1];
    Co::set(['ftp_size' => $size]);
    $cli->close();
});

Co::wait(['ftp_size']);
return Co::get('ftp_size');

4. Summary

By using the coroutine feature of Swoole, it can be effective Optimize the swoole_ftp_size function to improve system performance and stability in high concurrency scenarios. This article introduces the specific implementation steps. Swoole will continue to develop in the future, and I believe it will play an important role in more fields.

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