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初始化SSE服务端项目

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ykxiao
2025-07-01 20:07:24 +08:00
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.idea
node_modules
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# SSE - Simple Server-Sent Events
SSE (Server-Sent Events) is a web technology that allows a web server to push data to a web page in real time. It's a simple way to create a real-time, bi-directional communication channel between a web server and a web browser.
## Project Setup
1. **Create a new directory** for your project:
2. npm init -y
3. npm install express
4. node app.js

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/**
* @file SSE服务器主入口文件
* @author Yk <yk_9001@icloud.com>
* @createdAt 2025-07-01
* @version 1.0.0
* @description Express服务器配置和路由初始化
*/
const express = require('express');
const bodyParser = require('body-parser');
const security = require('./middlewares/security');
const streamRouter = require('./routes/stream');
const pushRouter = require('./routes/push');
const {sendHeartbeat} = require('./lib/sse');
const config = require('./config');
const app = express();
// 中间件
app.use(bodyParser.json());
app.use(...security);
// 路由
app.use('/stream', streamRouter);
app.use('/push', pushRouter);
// 心跳
setInterval(sendHeartbeat, config.sse.heartbeatInterval);
// 错误处理
const errorHandler = (err, req, res, next) => {
console.error(err.stack);
res.status(500).json({
code: 500,
error: 'Internal Server Error',
timestamp: new Date().toISOString()
});
};
app.use(errorHandler);
app.listen(config.server.port, () => {
console.log(`SSE server running on port ${config.server.port}`);
});

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/**
* @file 应用配置文件
* @author Yk <yk_9001@icloud.com>
* @createdAt 2025-07-01
* @lastModifiedAt 2025-07-01
* @description 包含服务器、SSE和限流配置
*/
module.exports = {
server: {
port: process.env.PORT || 3000,
env: process.env.NODE_ENV || 'development'
},
sse: {
heartbeatInterval: 15000, // 15秒
allowedOrigins: '*', //process.env.ALLOWED_ORIGINS?.split(',') || ['http://localhost:3001']
},
rateLimit: {
windowMs: 15 * 60 * 1000, // 15分钟
max: 100 // 每个IP限制100个请求
}
};

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/**
* @file 管理所有 SSE 客户端连接的模块
* @author Yk <yk_9001@icloud.com>
* @date 2025-07-01
* @description 提供客户端连接的添加、移除、获取及广播消息功能
*/
class SSEClientsManager {
/**
* 构造函数，初始化一个 Map 来存储客户端连接
*/
constructor() {
this.clients = new Map(); // 使用 Map 存储 clientId 到响应对象的映射
}
/**
* 添加一个新的客户端连接
* @param {string} clientId - 客户端唯一标识
* @param {Object} res - HTTP 响应对象，用于后续通信
* @returns {number} 当前客户端数量
*/
add(clientId, res) {
this.clients.set(clientId, res);
return this.clients.size;
}
/**
* 移除指定的客户端连接
* @param {string} clientId - 要移除的客户端 ID
* @returns {number} 移除后剩余的客户端数量
*/
remove(clientId) {
this.clients.delete(clientId);
return this.clients.size;
}
/**
* 获取指定的客户端响应对象
* @param {string} clientId - 客户端 ID
* @returns {Object} 对应的响应对象，或 undefined
*/
get(clientId) {
return this.clients.get(clientId);
}
/**
* 向所有客户端广播数据
* @param {*} data - 要广播的数据，将被序列化为 JSON
* @returns {number} 成功发送的客户端数量
*/
broadcast(data) {
let successCount = 0;
for (const [id, res] of this.clients.entries()) {
try {
res.write(`data: ${JSON.stringify(data)}\n\n`); // 发送标准的 SSE 格式数据
successCount++;
} catch (err) {
this.remove(id); // 如果发送失败，移除该客户端连接
}
}
return successCount;
}
/**
* 获取当前连接的客户端总数
* @returns {number}
*/
size() {
return this.clients.size;
}
}
// 导出单例实例，确保全局共享同一组客户端连接
module.exports = new SSEClientsManager();

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/**
* @file 处理SSE请求
* @author Yk <yk_9001@icloud.com>
* @createdAt 2025-07-01
* @lastModifiedAt 2025-07-01
* @description 维护链接的客户端
*/
// 引入客户端管理模块，用于维护连接的客户端
const clients = require('./clients');
/**
* 设置 SSE（Server-Sent Events）响应头，确保客户端能够正确接收事件流
* @param {Object} res - HTTP 响应对象
*/
function setupSSEHeaders(res) {
res.setHeader('Content-Type', 'text/event-stream'); // 指定内容类型为事件流
res.setHeader('Cache-Control', 'no-cache'); // 禁止缓存
res.setHeader('Connection', 'keep-alive'); // 保持长连接
res.flushHeaders(); // 立即发送响应头
}
/**
* 发送心跳事件给所有连接的客户端，用于保持连接活跃并传递服务器时间
* @returns {void}
*/
function sendHeartbeat() {
const data = {
event: 'heartbeat', // 事件类型为 heartbeat
time: new Date().toISOString() // 当前时间的 ISO 字符串格式
};
return clients.broadcast(data); // 广播给所有连接的客户端
}
// 导出函数，供其他模块使用
module.exports = {
setupSSEHeaders,
sendHeartbeat
};

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/**
* @file 安全相关中间件集合
* @author Yk <yk_9001@icloud.com>
* @date 2025-07-01
* @description 包含helmet、CORS和限流中间件
*/
// 引入必要的安全中间件模块
const helmet = require('helmet'); // 用于设置 HTTP 头，增强前端安全防护
const cors = require('cors'); // 跨域资源共享中间件，允许指定来源访问
const rateLimit = require('express-rate-limit');// 请求频率限制，防止 DDoS 或暴力攻击
const config = require('../config'); // 应用配置文件，包含安全策略参数
/**
* 导出中间件数组，按顺序应用以下安全策略：
* 1. Helmet：设置各种 HTTP 安全头，防止常见漏洞
* 2. CORS：配置允许的跨域请求来源、方法（GET/POST）并支持凭证
* 3. Rate Limit：根据配置限制客户端请求频率
*/
module.exports = [
helmet(), // 使用默认或自定义配置启用安全头防护
cors({
origin: config.sse.allowedOrigins, // 允许的跨域请求源，从配置中读取
methods: ['GET', 'POST'], // 支持的 HTTP 方法
credentials: true // 允许携带凭证（如 cookies）
}),
rateLimit(config.rateLimit) // 应用请求频率限制策略，配置来自 config
];

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14
package.json Normal file
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{
"name": "sse-server",
"version": "1.0.0",
"type": "commonjs",
"dependencies": {
"body-parser": "^2.2.0",
"cors": "^2.8.5",
"express": "^5.1.0",
"express-rate-limit": "^7.5.1",
"express-sse": "^1.0.0",
"helmet": "^8.1.0",
"uuid": "^11.1.0"
}
}

37
routes/push.js Normal file
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/**
* @file SSE流路由处理器
* @author Yk <yk_9001@icloud.com>
* @createdAt 2025-07-01
* @lastModifiedAt 2025-07-01
* @description 处理SSE连接
*/
const express = require('express');
const clients = require('../lib/clients');
const router = express.Router();
router.post('/', (req, res) => {
const { message, clientId } = req.body;
if (!message) {
return res.status(400).json({ error: 'Message is required' });
}
const data = { message, time: new Date().toISOString() };
if (clientId) {
const clientRes = clients.get(clientId);
if (!clientRes) {
return res.status(404).json({ error: 'Client not found' });
}
clientRes.write(`data: ${JSON.stringify(data)}\n\n`);
return res.json({ message: 'Message delivered', clientId });
}
const count = clients.broadcast(data);
return res.json({ message: 'Message broadcasted', clients: count });
});
module.exports = router;

35
routes/stream.js Normal file
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/**
* @file SSE流路由处理器
* @author Yk <yk_9001@icloud.com>
* @createdAt 2025-07-01
* @lastModifiedAt 2025-07-01
* @description 处理SSE连接建立和维持
*/
const express = require('express');
const { v4: uuidV4 } = require('uuid');
const { setupSSEHeaders } = require('../lib/sse');
const clients = require('../lib/clients');
const router = express.Router();
router.get('/', (req, res) => {
const clientId = req.query.clientId || uuidV4();
setupSSEHeaders(res);
// 立即发送确认
res.write(`data: ${JSON.stringify({
status: 'connected',
clientId,
time: new Date().toISOString()
})}\n\n`);
clients.add(clientId, res);
req.on('close', () => {
clients.remove(clientId);
});
});
module.exports = router;