Cosmostat Init Commit

files/web/node_server/Dockerfile

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+# Use an official Node runtime
+FROM node:20-alpine
+
+# Create app directory
+WORKDIR /usr/src/app
+
+# Install dependencies
+COPY package.json .
+RUN npm install --only=production
+
+# Copy app source
+COPY . .
+
+# Expose the port that the app listens on
+EXPOSE 3000
+
+# Start the server
+CMD ["node", "server.js"]

files/web/node_server/package.json

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+{
+  "name": "redis-table-demo",
+  "version": "1.0.0",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "express": "^4.18.2",
+    "socket.io": "^4.7.2",
+    "redis": "^4.6.7"
+  }
+}

files/web/node_server/server.js

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