Advanced Workerman Network Programming: Implementing a High Concurrency Instant Messaging System-Workerman-php.cn

Advanced Workerman Network Programming: Implementing a High Concurrency Instant Messaging System

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Release： 2023-08-05 16:09:07

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Workerman Network Programming Advanced: Implementing High Concurrency Instant Messaging System

With the popularity of mobile Internet, instant messaging systems play an increasingly important role in our lives. Implementing a highly concurrent instant messaging system is an important milestone for learning network programming. In this article, we will use the Workerman framework to implement a highly concurrent instant messaging system, and introduce the implementation process in detail through code examples.

First, we need to install the Workerman framework. Workerman is a lightweight PHP asynchronous network programming framework. It provides rich network programming functions and can meet our needs for implementing a high-concurrency instant messaging system. Workerman can be installed through composer and run the following command:

composer require workerman/workerman

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After the installation is completed, we can start writing the code to implement a high-concurrency instant messaging system.

Create a server class

First, we create a server class to handle client connections and message sending. The code example is as follows:

use WorkermanWorker;

class ChatServer
{
    protected $clients;
    
    public function __construct()
    {
        $this->clients = new SplObjectStorage;
        
        $ws_worker = new Worker('websocket://0.0.0.0:8000');
        
        $ws_worker->onConnect = function($connection) {
            $this->clients->attach($connection);
            echo "New client connected
";
        };
        
        $ws_worker->onMessage = function($connection, $data) {
            // 处理接收到的消息
            foreach ($this->clients as $client) {
                $client->send($data);
            }
        };
        
        $ws_worker->onClose = function($connection) {
            $this->clients->detach($connection);
            echo "Client disconnected
";
        };
        
        Worker::runAll();
    }
}

new ChatServer();

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In the above code, we first create a Workerman Worker object and set its listening address and port to websocket://0.0.0.0:8000. Then three callback functions are defined to handle the client's connection, received message and disconnection respectively. In the onConnect callback function, we use SplObjectStorage to save all client connection objects. In the onMessage callback function, we iterate through all client connection objects and send the received message to each client. In the onClose callback function, we delete the disconnected client object from SplObjectStorage.

Create client page

Next, we create a client page to connect to the server and send and receive messages. The code example is as follows:

<!DOCTYPE html>
<html>
<head>
    <title>Chat App</title>
    <style>
        #messages {
            height: 300px;
            overflow-y: scroll;
        }
    </style>
</head>
<body>
    <div id="messages"></div>
    <form id="form">
        <input type="text" id="message" autocomplete="off">
        <button>Send</button>
    </form>

    <script>
        const messages = document.getElementById('messages');
        const form = document.getElementById('form');
        const input = document.getElementById('message');
        
        const ws = new WebSocket('ws://localhost:8000');
        
        ws.onopen = function() {
            console.log('Connected to the server');
        };
        
        ws.onmessage = function(event) {
            const message = document.createElement('div');
            message.textContent = event.data;
            messages.appendChild(message);
        };
        
        form.addEventListener('submit', function(event) {
            event.preventDefault();
            
            const message = input.value;
            input.value = '';
            
            ws.send(message);
        });
    </script>
</body>
</html>

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In the above code, we create a websocket connection object and connect to the server’s address ws://localhost:8000. Then the handler functions for onopen, onmessage and submit events are defined. In the onmessage callback function, we create a div element and add the received message to the div element, and then add the div element to the messages element on the page. In the handler function of the submit event, we get the text in the input box and send it to the server.

Run the code

Save the above two pieces of code as server.php and client.html files respectively. Run the following command in the command line:

php server.php start

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Then open the client.html file in the browser. You can access an instant messaging system page implemented through WebSocket. After multiple clients connect to the server, messages can be sent in real time and displayed in the message list.

Summary:

Through the above code examples, we have implemented a high-concurrency instant messaging system based on the Workerman framework from creating server classes to creating client pages. By studying this example, we have a deeper understanding of high concurrency processing in network programming. At the same time, we also learned about the power and simplicity of the Workerman framework, which allows us to develop powerful network applications more quickly. I hope this article will be helpful for you to learn network programming and use the Workerman framework.

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