How to use coroutines to implement high-concurrency swoole_mail function in Swoole

Swoole is a high-performance asynchronous network communication framework based on PHP language, which provides a variety of asynchronous programming features such as coroutines, asynchronous IO, and multi-process. In Swoole-based web applications, the Swoole_mail function is a commonly used mail sending function. However, since a large number of mail sending requests will burden system resources, and there is also a certain delay in the response speed of the mail server, how to use coroutine implementation in Swoole The highly concurrent swoole_mail function has become an important topic.

1. Understand Swoole coroutine

Coroutine is a lightweight thread that can achieve concurrent execution of multiple tasks in a single thread, which can effectively improve system performance. In Swoole, coroutine is an asynchronous programming model based on coroutine provided by Swoole. Coroutine can be used to achieve highly concurrent network communication, database access, file reading and writing and other operations.

In Swoole, you can create a coroutine through the swoole_coroutine_create function, use the swoole_coroutine_resume function to start a coroutine and return the result of the coroutine execution. At the same time, you can use the swoole_event_add function to add the coroutine to the event loop to implement event-driven asynchronous programming.

2. Detailed explanation of Swoole_mail function

The Swoole_mail function is a commonly used email sending function in Swoole, which can send emails through the SMTP protocol. When using the Swoole_mail function, you need to specify the address, port, username, password and other parameters of the email sending server. You also need to specify the recipient, sender, subject, content and other information of the email.

The basic usage of the Swoole_mail function is as follows:

bool swoole_mail ( string $to , array $headers , string $body )

Among them, the $to parameter is the recipient address of the email, the $headers parameter is the header information of the email, and the $body parameter is the content of the email. . At the same time, the mail server configuration can be set through swoole_client.

3. Use coroutines to implement high-concurrency Swoole_mail function

When implementing high-concurrency Swoole_mail functions, you can use the coroutine feature provided by Swoole to process the email sending request as a coroutine. , use the swoole_event_add function to add the coroutine to the event loop. The specific implementation steps are as follows:

1. Use the swoole_coroutine_create function to create a coroutine and use the email sending request as a task performed by the coroutine.

$send_coroutine = function ($to, $headers, $body) {
    // 设置邮件服务器信息
    $client = new SwooleCoroutineClient(SWOOLE_SOCK_TCP);
    $client->connect($smtp_server, $smtp_port);
    $client->recv();
    // 登录邮件服务器
    $client->send("AUTH LOGIN
");
    $client->recv();
    $client->send(base64_encode($smtp_user)."
");
    $client->recv();
    $client->send(base64_encode($smtp_pass)."
");
    $client->recv();
    // 设置邮件信息
    $client->send("MAIL FROM:<{$from}>
");
    $client->recv();
    $client->send("RCPT TO:<{$to}>
");
    $client->recv();
    $client->send("DATA
");
    $client->recv();
    $client->send($headers."
".$body."
.
");
    $client->recv();
    // 关闭连接
    $client->close();
}

2. Use the swoole_event_add function to add the coroutine to the event loop, and return the result after the coroutine execution is completed.

$coroutines = [];

foreach ($to_list as $to) {
    $coroutines[] = swoole_coroutine_create($send_coroutine, $to, $headers, $body);
}

$results = [];

foreach ($coroutines as $coroutine) {
    swoole_event_add($coroutine, function ($coroutine) use (&$results) {
        $results[] = swoole_coroutine_resume($coroutine);
    });
}

swoole_event_wait();

return $results;

The above code processes multiple email sending requests as coroutines, and adds the coroutines to the event loop through the swoole_event_add function to achieve concurrent execution of multiple tasks. At the same time, after the coroutine execution is completed, use the swoole_coroutine_resume function to return the coroutine execution result.

4. Summary

By using the coroutine feature provided by Swoole, the highly concurrent Swoole_mail function can be realized. In actual applications, optimization can be carried out according to specific business scenarios. At the same time, factors such as system resource occupation and the response speed of the mail server need to be considered.

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