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

Swoole is a high-performance network communication framework that can use coroutines to achieve high-concurrency network communication. In Swoole, there is a very practical function swoole_ftpput for FTP file upload, but it does not support coroutines when called alone, so it cannot optimize the service during high concurrency. This article will introduce how to use coroutines in Swoole to implement the highly concurrent swoole_ftpput function to improve service performance.

1. swoole_ftpput function

The swoole_ftpput function is a function provided by Swoole for FTP file upload. Through this function, you can upload local files to the FTP server. The swoole_ftpput function is defined as follows:

bool swoole_ftpput($ftp_stream, $remote_file, $local_file, $mode = -1);

Among them, $ftp_stream represents the resource handle of the FTP connection, $remote_file represents the remote file path, $local_file represents the local file path, $mode represents the transmission mode, and -1 represents the use of passive mode. , 0 means using active mode. The swoole_ftpput function is blocking, so when multiple files are uploaded at the same time in one process, you need to wait for the current file to be uploaded before uploading the next file.

2. Use coroutines to achieve high-concurrency upload

In order to achieve high-concurrency file uploads, we can use the Swoole coroutine to optimize the swoole_ftpput function. The specific method is as follows:

1. Create a folder on the FTP server to store uploaded files.
2. Write a coroutine task function, which is used to upload a file to the FTP server.

function ftpUpload($ftp, $filename) {
    $local_file = '/path/to/local/file/' . $filename;
    $remote_file = '/path/to/remote/file/' . $filename;

    $ret = swoole_coroutine_syscall('file_get_contents', $local_file);
    if($ret === false){
        echo "upload failed: file_get_contents failed
";
        return;
    }

    $ret = swoole_coroutine_syscall('swoole_ftpput', $ftp, $remote_file, $local_file);
    if($ret === false){
        echo "upload failed: swoole_ftpput failed
";
        return;
    }

    echo "upload success: $filename
";
}

In this function, we first use the file_get_contents function to read the contents of the local file, and then use the swoole_ftpput function to upload the contents to the FTP server. When using the swoole_ftpput function, we use the swoole_coroutine_syscall function to convert it to coroutine execution.

3. Execute upload tasks concurrently in the main function.

In the main function, we execute multiple upload tasks concurrently through a for loop to achieve the purpose of high concurrent upload. The code is as follows:

$ftp = ftp_connect($ftp_host, $ftp_port);
ftp_login($ftp, $ftp_user, $ftp_pass);
ftp_pasv($ftp, true);

$scheduler = new SwooleCoroutineScheduler();

for($i = 1; $i <= 10; $i++) {
    $scheduler->add("ftpUpload", $ftp, "file$i.txt");
}

$scheduler->start();

ftp_close($ftp);

In the main function, we first use the ftp_connect function to connect to the FTP server, then use the ftp_login function to log in, and finally use the ftp_pasv function to enable passive mode. Next, we create a SwooleCoroutineScheduler object, add upload tasks to the scheduler through the add method, and start the scheduler using the start method to execute multiple tasks concurrently in the scheduler.

3. Summary

Using coroutines can help us optimize the performance of the FTP file upload service and improve the concurrency capability of the service. In this article, we introduce how to use coroutines to implement the highly concurrent swoole_ftpput function in Swoole to implement multiple file upload services. In actual applications, it can be optimized according to actual needs to improve service performance.

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