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

In recent years, with the increasing popularity of Internet applications, various high-concurrency scenarios have become more and more common. In this case, the traditional synchronous I/O method can no longer meet the needs of modern applications for high performance and high concurrency. Therefore, coroutines have become a widely used solution.

Swoole is a PHP network communication framework for high concurrency and high performance, which can easily implement asynchronous, coroutine and other features. The swoole_smtp_auth function is one of the commonly used functions, which can authenticate the mailbox when sending emails using the SMTP protocol. This article will introduce how to use coroutines to implement the highly concurrent swoole_smtp_auth function in Swoole.

1. Introducing the Swoole coroutine library

Before using the Swoole coroutine, you need to introduce the Swoole coroutine library. It can be installed through the composer command:

composer require swoole/ide-helper

Introduce the following namespace into the PHP code:

use SwooleCoroutine;
use SwooleCoroutineSocket;

2. Implement the swoole_smtp_auth function

The prototype of the swoole_smtp_auth function is as follows :

function swoole_smtp_auth(Socket $sock, string $username, string $password, string $hostname = '');

Among them, $sock is a connected SMTP server Socket, $username and $password are the email account and password respectively. The function of this function is to verify whether the email account and password are correct.

We can use the following method to implement the swoole_smtp_auth function:

function swoole_smtp_auth(Socket $sock, string $username, string $password, string $hostname = '')
{
    $cmd = "AUTH LOGIN
";
    $sock->send($cmd);
    $resp = $sock->recv();

    if (strpos($resp, '334') !== 0) {
        throw new Exception("Failed to execute command: $cmd");
    }

    $cmd = base64_encode($username) . "
";
    $sock->send($cmd);
    $resp = $sock->recv();

    if (strpos($resp, '334') !== 0) {
        throw new Exception("Failed to execute command: $cmd");
    }

    $cmd = base64_encode($password) . "
";
    $sock->send($cmd);
    $resp = $sock->recv();

    if (strpos($resp, '235') !== 0) {
        throw new Exception("Authentication failed");
    }

    return true;
}

This function sends commands to the SMTP server through the SMTP protocol to verify the email account and password. Among them, the $cmd variable is the command string in the SMTP protocol, and the $resp variable is the response string returned by the SMTP server. This function parses the response string and returns true if the verification is successful; otherwise, an exception is thrown.

3. Use coroutines to achieve high concurrency

When using Swoole coroutines, you can use coroutine scheduling to enable multiple coroutines to execute simultaneously. The following sample code demonstrates how to use coroutines to implement multiple SMTP servers to simultaneously verify multiple email accounts and passwords.

$hostnames = ['smtp.gmail.com', 'smtp.qq.com', 'smtp.163.com'];
$usernames = ['user1@gmail.com', 'user2@qq.com', 'user3@163.com'];
$passwords = ['password1', 'password2', 'password3'];

$socks = [];
foreach ($hostnames as $host) {
    $sock = new Socket(AF_INET, SOCK_STREAM, 0);

    if (!$sock->connect($host, 587)) {
        throw new Exception("Failed to connect to $host:587");
    }

    swoole_smtp_auth($sock, $username, $password, $host);

    $socks[] = $sock;
}

$coros = [];
for ($i = 0; $i < count($usernames); $i++) {
    $coros[] = Coroutine::create(function () use ($socks, $usernames, $passwords, $i) {
        swoole_smtp_auth($socks[$i % count($socks)], $usernames[$i], $passwords[$i]);
    });
}

Coroutine::wait($coros);

In the above code, we first create multiple SMTP connections and verify them separately. Next, we use coroutine scheduling to open multiple coroutines, and each coroutine verifies an email account and password. By using coroutines, we can simultaneously verify multiple SMTP connections and multiple email accounts and passwords in the program, thereby achieving high concurrency.

4. Summary

This article introduces how to use coroutines to implement the highly concurrent swoole_smtp_auth function in Swoole. By using the Swoole coroutine library, we can easily implement features such as asynchronous and coroutine, and obtain a better performance experience in high-concurrency application scenarios.

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