update

cmd/cart/main.go

@@ -145,7 +145,7 @@ func main() {
 		log.Fatalf("Error creating inventory service: %v\n", err)
 	}
 
-	syncedServer := NewPoolServer(pool, fmt.Sprintf("%s, %s", name, podIp), klarnaClient, inventoryService)
+	syncedServer := NewPoolServer(pool, fmt.Sprintf("%s, %s", name, podIp), klarnaClient, inventoryService, rdb)
 
 	app := &App{
 		pool:         pool,

cmd/cart/pool-server.go

@@ -55,15 +55,13 @@ func NewPoolServer(pool actor.GrainPool[*cart.CartGrain], pod_name string, klarn
 		klarnaClient:     klarnaClient,
 		inventoryService: inventoryService,
 	}
-	inventory.NewInventoryChangeListener(inventoryRedisClient, func(ctx context.Context, sku inventory.SKU, locationID inventory.LocationID) {
-		qty, err := inventoryService.GetInventory(ctx, sku, locationID)
-		if err != nil {
-			log.Printf("error fetching inventory for sku %s at location %s: %v", sku, locationID, err)
+	inventory.NewInventoryChangeListener(inventoryRedisClient, context.Background(), func(changes []inventory.InventoryChange) {
+		for _, change := range changes {
+			srv.GrainPool.GetPubSub().Publish(actor.Event{
+				Topic:   fmt.Sprintf("inventory:%s:%s", change.SKU, change.StockLocationID),
+				Payload: change.Value,
+			})
 		}
-		srv.GrainPool.GetPubSub().Publish(actor.Event{
-			Topic:   fmt.Sprintf("inventory:%s:%s", sku, locationID),
-			Payload: qty,
-		})
 	})
 	return srv
 }