70 lines
1.8 KiB
JavaScript
70 lines
1.8 KiB
JavaScript
// server.js
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const http = require('http');
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const express = require('express');
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const { createClient } = require('redis');
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const { Server } = require('socket.io');
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const app = express();
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const server = http.createServer(app);
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const io = new Server(server);
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// Serve static files (index.html)
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app.use(express.static('public'));
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// ---------- Redis subscriber ----------
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const redisClient = createClient({
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url: 'redis://172.17.0.1:6379'
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});
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redisClient.on('error', err => console.error('Redis error', err));
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(async () => {
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await redisClient.connect();
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const sub = redisClient.duplicate(); // duplicate to keep separate pub/sub
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await sub.connect();
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// Subscribe to the channel that sends host stats
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await sub.subscribe(
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['host_stats'],
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(message, channel) => { // <-- single handler
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let payload;
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try {
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payload = JSON.parse(message); // message is a JSON string
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} catch (e) {
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console.error(`Failed to parse ${channel}`, e);
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return;
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}
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io.emit(channel, payload);
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}
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);
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// Subscribe to the channel that sends history stats
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await sub.subscribe(
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['history_stats'],
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(message, channel) => {
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let payload;
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try {
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payload = JSON.parse(message); // message is a JSON string
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} catch (e) {
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console.error(`Failed to parse ${channel}`, e);
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return;
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}
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io.emit(channel, payload);
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}
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);
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sub.on('error', err => console.error('Subscriber error', err));
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})();
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// ---------- Socket.io ----------
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io.on('connection', socket => {
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console.log('client connected:', socket.id);
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// Optional: send the current state on connect if you keep it cached
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});
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// ---------- Start ----------
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const PORT = process.env.PORT || 3000;
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server.listen(PORT, () => {
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console.log(`Server listening on http://localhost:${PORT}`);
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}); |