Implementation method of packet parsing in Workerman document

Workerman is a high-performance PHP development framework and a PHP version of the Socket server. It is characterized by high performance, high concurrency, low consumption, and easy deployment. In the process of developing Socket servers using Workerman, packet parsing is a very important part. This article will introduce the implementation method of packet parsing in the Workerman document and give specific code examples.

In Workerman, packet parsing is implemented through event callbacks. When the server receives the data sent by the client, it will trigger a callback function. Developers need to implement the data packet parsing logic in this callback function.

First, we need to register a callback function to receive the data sent by the client. The code is as follows:

use WorkermanWorker;

$worker = new Worker('tcp://0.0.0.0:1234');

// 当客户端连接上来时
$worker->onConnect = function($connection) {
    echo "New Connection
";
};

// 当客户端发来数据时
$worker->onMessage = function($connection, $data) {
    // 在这里实现数据包的解析逻辑
    // ...
};

// 运行worker
Worker::runAll();

In the onMessage event callback function, we can parse the received data. The following takes a simple protocol as an example to parse fixed-length data packets. Assuming that the length of each data packet is a fixed 20 bytes, the code is as follows:

$worker->onMessage = function($connection, $data) {
    // 先判断数据长度是否满足条件
    if (strlen($data) < 20) {
        echo "Invalid Data Length
";
        return;
    }
    
    // 截取前20个字节作为一个完整的数据包
    $packet = substr($data, 0, 20);
    
    // 处理数据包的逻辑
    // ...
};

In the above code, first determine whether the length of the received data satisfies 20 bytes. If not, then It means that the received data is incomplete and you need to wait for subsequent data before parsing. Then, the first 20 bytes are intercepted as a complete data packet through the substr function, and the data packet can be processed at the // logic of processing the data packet.

In addition to fixed-length data packets, there is also a common data packet format that uses a specific string as a delimiter. For example, multiple data packets in JSON format are separated by newline characters `
`. The code example is as follows:

$worker->onMessage = function($connection, $data) {
    // 按换行符分割数据
    $packets = explode("
", $data);
    
    // 遍历每个数据包
    foreach ($packets as $packet) {
        // 处理数据包的逻辑
        // ...
    }
};

In the above code, we use the explode function to separate newline characters `
`Split the data into packets using the delimiter, then traverse each packet and process it.

It should be noted that in actual development, the parsing logic of data packets may be more complex, so the above are just some simple examples, and the specific data packet parsing needs to be expanded according to the actual situation.

In short, it is very simple for Workerman to parse data packets through event callbacks. Developers only need to parse the data according to the protocol rules in the corresponding callback function to complete the parsing of the data packet.

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