Implement the file transfer function in Workerman documents

Workerman is a high-performance asynchronous event-driven framework developed based on PHP, which can easily realize the development of long connections under the TCP/UDP protocol. In addition, Workerman also provides the function of realizing file transfer, which can be used in scenarios such as large file transfer and data backup. This article will introduce how to implement the file transfer function in Workerman and provide specific code examples.

1. Implementation of file upload function

The file upload function requires the client to send the file to be uploaded to the server, and the server verifies and saves the file. In Workerman, the file upload function can be implemented by using the workerman/file-transfer component. The specific process is as follows:

1. The client packages the file into a zip file and sends it to the server.

$ftp = new Ftp($server_ip, $server_port);
$ftp->connect();
$response = $ftp->send($zip_file_path);

The FTP component is used here to send the zip file packaged by the client to the server.

2. The server verifies the file format and decompresses it.

public static function handle($connection, $data)
{
    $zip_file = 'upload_file.zip';
    file_put_contents($zip_file, $data);
    $zip = new ZipArchive();
    if ($zip->open($zip_file) === TRUE) {
        $zip->extractTo('./unzip_file/');
        $zip->close();
        unlink($zip_file);
    } else {
        $connection->send("unzip failed");
    }
}

The server receives the file data from the client through the workerman/file-transfer component and saves it as a zip file. Then use the ZipArchive library to decompress the file and save the decompressed file in the specified directory. If decompression fails, failure information is sent to the client.

2. Implementation of file download function

The file download function requires the client to request a file from the server and save the file data responded by the server as a local file. In Workerman, you can use PHP's fopen() function to open the local file connection and the server-side file connection, and write the file data returned by the server to the local file. The specific process is as follows:

1. The client initiates a file download request to the server.

$client->send(json_encode([
    'type' => 'download',
    'filename' => $filename,
]));

The client sends a message to the server, carrying the name of the file to be downloaded.

2. The server receives the client's request and sends the file data in a streaming manner.

public static function handle($connection, $data)
{
    $data = json_decode($data, true);
    $filename = $data['filename'];
    if (!file_exists($filename)) {
        $connection->send(json_encode(['code' => -1, 'msg' => 'file not exist']));
        return;
    }
    $fp = fopen($filename, 'rb');
    $total = filesize($filename);
    $connection->send(json_encode(['code' => 0, 'msg' => 'filesize', 'data' => ['size' => $total]]));
    while (!feof($fp)) {
        $connection->send(fread($fp, 8192), true);
    }
    fclose($fp);
}

After the server receives the client's request, it first determines whether the file exists. If the file does not exist, a failure message is returned to the client. If the file exists, the file connection is opened using the fopen() function and the total size of the file is calculated. Then send the total file size information to the client. Subsequently, the file content is sent to the client multiple times through a while loop.

3. The client receives the file data from the server and saves it as a local file.

public function download($client, $response)
{
    $this->downloadSize = 0;
    $this->downloadTotal = $response['data']['size'];
    $data = json_encode(['type' => 'download_continue']);
    while ($this->downloadSize < $this->downloadTotal) {
        $client->send($data);
    }
    fclose($fp);
}

After the client receives the total file size from the server, it uses a loop to receive the file data sent by the server and saves it as a local file.

To sum up, by using the workerman/file-transfer component and PHP's fopen() function, we can easily implement file upload and download functions in Workerman. It should be noted that when uploading large files, functions such as upload progress bar or segmented transmission need to be added to improve user experience.

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