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server.js
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server.js
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const express = require('express');
const bodyParser = require('body-parser');
const cors = require('cors');
const WebSocket = require('ws');
const app = express();
const PORT = 3000;
// Resolve cross-domain issues.
app.use(cors());
// Use the body-parser middleware to parse JSON data.
app.use(bodyParser.json());
let receivedData = {};
// create WebSocket server
const wss = new WebSocket.Server({ noServer: true });
// WebSocket connection
wss.on('connection', (ws) => {
console.log('client connected');
// send message to client
ws.send(JSON.stringify({ content: 'hello from server ~' }));
// process received message
ws.on('message', (message) => {
console.log('message received:', message);
// you can process message here
});
ws.on('close', () => {
console.log('client disconnected');
});
});
// make WebSocket server and HTTP server together
const server = app.listen(PORT, () => {
console.log(`server running on http://localhost:${PORT}`);
});
// add WebSocket server to HTTP server
server.on('upgrade', (request, socket, head) => {
wss.handleUpgrade(request, socket, head, (ws) => {
wss.emit('connection', ws, request);
});
});
// POST interface
app.post('/api', (req, res) => {
console.log('received POST data:', req.body);
receivedData = req.body;
// boardcast to all connected client
wss.clients.forEach(client => {
if (client.readyState === WebSocket.OPEN) {
client.send(JSON.stringify({ content: receivedData }));
}
});
// response
res.json({ message: 'data receive', receivedData: req.body });
});