fix: resilient store — Redis/Mongo errors don't stop consumer

server.js

@@ -41,6 +41,7 @@ async function getMongo() {
 }
 
 async function store(event) {
+  try {
     const r = await getRedis();
     await r.hSet("iot:latest", event.sensor_id, JSON.stringify({
       value: event.value, unit: event.unit, location: event.location, timestamp: event.timestamp,
@@ -48,12 +49,16 @@ async function store(event) {
     await r.hIncrBy("iot:counters", event.device_type, 1);
     await r.zAdd("iot:recent", [{ score: 0, value: JSON.stringify(event) }]);
     await r.zRemRangeByRank("iot:recent", 0, -1001);
+  } catch (e) { console.error("Redis error:", e.message); }
+
+  try {
     const coll = await getMongo();
     await coll.insertOne({
       event_id: event.event_id, sensor_id: event.sensor_id,
       device_type: event.device_type, location: event.location,
       value: event.value, unit: event.unit, timestamp: new Date(event.timestamp),
     });
+  } catch (e) { console.error("Mongo error:", e.message); }
 }
 
 async function start() {
@@ -62,16 +67,16 @@ async function start() {
   await ch.assertQueue(RMQ_QUEUE, { durable: true });
   ch.prefetch(10);
   await ch.consume(RMQ_QUEUE, async (msg) => {
+    if (!msg) return;
     try {
-      if (msg) {
       const event = JSON.parse(msg.content.toString());
       await store(event);
       consumed++;
       ch.ack(msg);
       if (consumed % 10 === 0) console.log(`Consumed ${consumed} events`);
-      }
     } catch (e) {
       errors++;
+      ch.nack(msg, false, true);
       console.error("Error:", e.message);
     }
   });