feat: initialize microservice architecture with auth, api, realtime, copernicus, ml, and console modules

realtime/src/helper/redis.js

@@ -0,0 +1,79 @@
+const Redis = require('ioredis');
+
+const redis = new Redis({
+    host: process.env.REDIS_HOST,
+    port: process.env.REDIS_PORT
+});
+
+// Client dedicato per subscribe (ioredis richiede client separato)
+const redisSub = new Redis({
+    host: process.env.REDIS_HOST,
+    port: process.env.REDIS_PORT
+});
+
+redis.on('error', (error) => {
+    console.error('Redis error:', error);
+});
+
+redis.on('connect', () => {
+    console.log('Server connected to Redis DB');
+});
+
+redisSub.on('error', (error) => {
+    console.error('Redis sub error:', error);
+});
+
+const sensors_hash_map = 'sensors:sessions';
+
+async function setSession(sensorID, metadata) {
+    await redis.hset(sensors_hash_map, sensorID, JSON.stringify(metadata));
+}
+
+async function getSession(sensorID) {
+    return await redis.hget(sensors_hash_map, sensorID);
+}
+
+async function deleteSession(sensorID) {
+    await redis.hdel(sensors_hash_map, sensorID);
+}
+
+async function getSessions() {
+    return await redis.hgetall(sensors_hash_map);
+}
+
+// --- Pub/Sub per live watchers ---
+
+async function publishSensorData(sensorId, data) {
+    await redis.publish(`sensor:data:${sensorId}`, JSON.stringify(data));
+}
+
+async function addWatcher(sensorId) {
+    return await redis.incr(`sensor:watchers:${sensorId}`);
+}
+
+async function removeWatcher(sensorId) {
+    const count = await redis.decr(`sensor:watchers:${sensorId}`);
+    if (count <= 0) {
+        await redis.del(`sensor:watchers:${sensorId}`);
+        return 0;
+    }
+    return count;
+}
+
+async function getWatcherCount(sensorId) {
+    const count = await redis.get(`sensor:watchers:${sensorId}`);
+    return parseInt(count) || 0;
+}
+
+module.exports = {
+    setSession,
+    getSession,
+    deleteSession,
+    getSessions,
+    publishSensorData,
+    addWatcher,
+    removeWatcher,
+    getWatcherCount,
+    redis,
+    redisSub
+};