update cart

cmd/inventory/main.go

@@ -132,20 +132,14 @@ func main() {
 		}
 		// items listener
 		err = messaging.ListenToTopic(ch, country, "item_added", func(d amqp.Delivery) error {
-			var items []*index.DataItem
-			err := json.Unmarshal(d.Body, &items)
-			if err == nil {
-				log.Printf("Got upserts %d, message count %d", len(items), d.MessageCount)
-				wg := &sync.WaitGroup{}
-				for _, item := range items {
-					stockhandler.HandleItem(item, wg)
-				}
+			wg := &sync.WaitGroup{}
+			err = index.ForEachRawDataItemInJSONArray(d.Body, func(item *index.RawDataItem) error {
+				stockhandler.HandleItem(item, wg)
 				wg.Wait()
 				log.Print("Batch done...")
-			} else {
-				log.Printf("Failed to unmarshal upsert message %v", err)
-			}
-			return err
+				return err
+			})
+			return nil
 		})
 		if err != nil {
 			log.Fatalf("Failed to listen to item_added topic: %v", err)