Workerman development: How to implement a real-time data visualization system based on HTTP protocol-Workerman-php.cn

Workerman development: How to implement a real-time data visualization system based on HTTP protocol

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Release： 2023-11-07 08:01:00

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Workerman development: How to implement a real-time data visualization system based on HTTP protocol

Workerman is a high-performance PHP network communication framework that can quickly build functions such as real-time communication, message push, and data visualization. This article will introduce how to use Workerman to develop a real-time data visualization system based on HTTP protocol, and provide specific code examples.

1. System Design

This system adopts B/S architecture, that is, the browser (Browser) and the server (Server) communicate through the HTTP protocol.

1. Server side:

(1) Use the Workerman framework to establish an HTTP server and listen to the default port (80);

(2) Obtain data in real time through PHP scripts , and returns the data to the browser in JSON format;

(3) Use the Websocket protocol to implement real-time communication between the server and the client, which is used to handle the situation where multiple clients send requests at the same time.

2. Client:

(1) Use HTML, CSS and JavaScript to build front-end pages, including data visualization interface and data request interface;

(2) Through JavaScript Establish a Websocket connection with the server to push and visualize real-time data.

2. Specific implementation

1. Server side:

(1) Use Composer to install the Workerman framework:

composer require workerman/workerman

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(2) Create index.php file and build the HTTP server:

<?php
require_once __DIR__ . '/vendor/autoload.php';//引入Workerman框架
use WorkermanProtocolsHttpRequest;
use WorkermanProtocolsHttpResponse;
use WorkermanWorker;

$http_worker = new Worker("http://0.0.0.0:80");//监听默认端口80

$http_worker->onMessage = function (Request $request) {
    $path = $request->path();//获取请求路径
    if ($path == '/') {//处理请求，返回HTML页面
        $response_str = file_get_contents(__DIR__ . '/index.html');
        $response = new Response(200, [], $response_str);
        $request->send($response);
    } elseif ($path == '/data') {//处理请求，返回JSON数据
        $data = getData();//获取实时数据
        $response = new Response(200, [], json_encode($data));//将数据转化为JSON格式
        $request->send($response);
    }
};

$http_worker->onWorkerStart = function () {
    global $ws_worker;
    $ws_worker = new Worker("websocket://0.0.0.0:8080");//监听WebSocket端口8080

    $ws_worker->count = 1;//设置Worker进程数

    $ws_worker->onMessage = function ($connection, $data) {
        $message = json_decode($data, true);//接收来自客户端的消息，并解析JSON格式数据
        switch ($message['type']) {
            case 'subscribe':
                //TODO 处理订阅请求，并发送数据
                break;
            case 'unsubscribe':
                //TODO 处理取消订阅请求
                break;
            default:
                break;
        }
    };

    Worker::runAll();//运行HTTP服务器和WebSocket服务器
};

//TODO 获取实时数据
function getData()
{
    return [];
}

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(3) Implement the WebSocket protocol:

After the Http server is started, you need to create a new WebSocket server and listen to the specified port for use between the client and the server real-time communication. In the onMessage callback, different requests are processed according to different message types, and real-time data is forwarded to the subscribed client.

$ws_worker = new Worker("websocket://0.0.0.0:8080");//监听WebSocket端口8080

$ws_worker->count = 1;//设置Worker进程数

$ws_worker->onMessage = function ($connection, $data) {
    $message = json_decode($data, true);//接收来自客户端的消息，并解析JSON格式数据
    switch ($message['type']) {
        case 'subscribe':
            //TODO 处理订阅请求，并发送数据
            break;
        case 'unsubscribe':
            //TODO 处理取消订阅请求
            break;
        default:
            break;
    }
};

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2. Client:

(1) HTML page:

In the HTML page, you need to use WebSocket to establish a connection and subscribe to data. When new data arrives, the corresponding visualization chart needs to be updated. Here we take ECharts as an example to show how to use JavaScript to achieve data visualization.

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>实时数据可视化</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/echarts/5.2.1/echarts.min.js"></script>
</head>
<body>
<div id="chart" style="width: 800px;height:400px;"></div>
<script>
    const socket = new WebSocket('ws://localhost:8080');//建立WebSocket连接

    //订阅请求
    socket.onopen = () => {
        socket.send(JSON.stringify({type: 'subscribe', data: {}}));
    };

    //接收来自服务器的消息
    socket.onmessage = (event) => {
        const message = JSON.parse(event.data);
        if (message.type === 'data') {//更新图表
            const chart = echarts.init(document.getElementById('chart'));
            const option = {
                xAxis: {
                    type: 'category',
                    data: message.data.xAxisData
                },
                yAxis: {
                    type: 'value'
                },
                series: [{
                    data: message.data.seriesData,
                    type: 'line'
                }]
            };
            chart.setOption(option);
        }
    };

    //取消订阅请求
    window.onbeforeunload = () => {
        socket.send(JSON.stringify({type: 'unsubscribe', data: {}}));
    };
</script>
</body>
</html>

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(2) JavaScript code:

In the JavaScript code, you need to monitor the connection and message events of WebSocket, and perform different processing according to different message types, such as subscribing to real-time data and updating visualization Charts etc.

const socket = new WebSocket('ws://localhost:8080');//建立WebSocket连接

//订阅请求
socket.onopen = () => {
    socket.send(JSON.stringify({type: 'subscribe', data: {}}));
};

//接收来自服务器的消息
socket.onmessage = (event) => {
    const message = JSON.parse(event.data);
    if (message.type === 'data') {//更新图表
        const chart = echarts.init(document.getElementById('chart'));
        const option = {
            xAxis: {
                type: 'category',
                data: message.data.xAxisData
            },
            yAxis: {
                type: 'value'
            },
            series: [{
                data: message.data.seriesData,
                type: 'line'
            }]
        };
        chart.setOption(option);
    }
};

//取消订阅请求
window.onbeforeunload = () => {
    socket.send(JSON.stringify({type: 'unsubscribe', data: {}}));
};

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3. Summary

This article introduces how to use the Workerman framework to develop a real-time data visualization system based on the HTTP protocol, and provides specific code examples. Real-time communication between the client and the server through WebSocket can improve the system's response speed and concurrent processing capabilities, which has certain advantages.

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