Workerman development: How to implement file transfer based on TCP protocol

Workerman Development: How to implement file transfer based on TCP protocol, specific code examples are required

Introduction:
In today's Internet era, file transfer has become a daily routine An integral part of work and life. File transfer based on TCP protocol is a method with high transmission efficiency and strong reliability. In this article, we will introduce how to use the Workerman framework to develop a file transfer service based on the TCP protocol, and provide specific code examples.

1. What is Workerman?
Workerman is a high-performance PHP Socket framework developed using pure PHP, used to quickly build multi-process/multi-thread applications. It supports TCP/UDP protocols, custom protocols and other features. Workerman has many advantages, such as high concurrent processing capabilities and good stability. Therefore, it is appropriate to choose Workerman as the framework for file transfer services.

2. Preparations for file transfer based on TCP protocol
Before starting development, you need to ensure that the system has installed the PHP environment and the Workerman framework. You can install Workerman through the following command:

composer require workerman/workerman

After the installation is complete, you can create a new file transfer.php for the file transfer service, and introduce the Workerman framework at the beginning of the file:

require_once __DIR__ . '/vendor/autoload.php';

3. Write the file The code of the transfer service

1. The code to start the file transfer service is as follows:

   use WorkermanWorker;
   
   // 创建一个Worker监听指定端口
   $worker = new Worker('tcp://0.0.0.0:600');
   
   // 设置运行的进程数，这里设置为1
   $worker->count = 1;
   
   // 定义文件传输相关的处理逻辑
   $worker->onMessage = function($connection, $data) {
    // 处理文件传输逻辑
    // ...
   };
   
   // 启动Worker
   Worker::runAll();

   The above code creates a Worker instance by calling the constructor of the Worker class and specifies the listener The port is 600. Then set the number of running processes to 1 and define the processing logic of the file transfer logic. Finally, start the Worker by calling the static method runAll() of the Worker class.

2. Next, we need to write the specific logic of file transfer. In the callback function of onMessage, you can use PHP's file processing function to realize file transfer.

   use WorkermanConnectionTcpConnection;
   
   // ...
   
   $worker->onMessage = function(TcpConnection $connection, $data) {
    if (strpos($data, 'start:') === 0) {
        // 获取文件名和文件大小
        $fileInfo = explode(':', $data);
        $fileName = $fileInfo[1];
        $fileSize = intval($fileInfo[2]);
   
        // 创建新的文件，并准备接收文件数据
        $file = fopen($fileName, 'w');
        $connection->file = $file;
        $connection->fileSize = $fileSize;
        $connection->currentSize = 0;
   
    } elseif ($connection->file && strlen($data) === 1024) {
        // 写入文件数据
        fwrite($connection->file, $data);
        $connection->currentSize += strlen($data);
   
        // 文件传输完成
        if ($connection->currentSize === $connection->fileSize) {
            fclose($connection->file);
            $connection->file = null;
            // 响应文件传输完成消息
            $connection->send('文件传输完成');
        }
    }
   };

   In the above code, the instance attribute of the TcpConnection class is used to save file-related information. When receiving the start message of the file transfer (the message starts with "start:"), first parse the file name and file size from the message, then create a new file through the fopen function, and use the properties of the TcpConnection class instance to save the file Handle, file size and currently received size. When file data is received, use the fwrite function to write the data to the file and update the currently received size. When the received size is equal to the file size, it indicates that the file transfer is completed, the file handle is closed, and a transfer completion message is sent to the client through the send method of the TcpConnection instance.

4. Test the file transfer service
In order to test the file transfer service, you can use telnet or a custom client program to connect to the server and send file data.

use WorkermanConnectionAsyncTcpConnection;

$connection = new AsyncTcpConnection('tcp://127.0.0.1:600');

$connection->onConnect = function() use($connection) {
    // 发送文件传输开始消息
    $connection->send('start:/path/to/file.txt:1024');
    
    // 读取文件数据并发送
    $file = fopen('/path/to/file.txt', 'r');
    while (!feof($file)) {
        $connection->send(fread($file, 1024));
    }

    // 关闭连接
    $connection->close();
};

$connection->connect();

In the above code, first create an AsyncTcpConnection instance and specify the connection address and port. After the connection is established, use the send method to send the message that the file transfer has begun, and read the file data and send it. After sending, close the connection through the close method.

5. Summary
Through the Workerman framework, we can easily implement file transfer services based on the TCP protocol. This article provides a specific file transfer service code example to help developers more quickly master and use Workerman for file transfer-related development. I hope this article can be helpful to you, welcome to communicate and discuss.

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