feat: implement locking mechanism for marketplace operations to prevent race conditions

internal/wb/products/repository_api.go

@@ -101,6 +101,7 @@ func fetchProducts(
 func (a apiRepository) StreamAllProductsCache(ctx context.Context, marketplaceId int, resultChan chan<- []pb.Product, errChan chan<- error) {
 	defer close(resultChan)
 	defer close(errChan)
+
 	mp, err := a.marketplaceRepository.GetMarketplaceByID(ctx, marketplaceId)
 	if err != nil {
 		errChan <- fmt.Errorf("getting marketplace by ID: %w", err)
@@ -111,9 +112,7 @@ func (a apiRepository) StreamAllProductsCache(ctx context.Context, marketplaceId
 		errChan <- fmt.Errorf("getting marketplace identifier: %w", err)
 		return
 	}
-
 	converter := generated.ConverterImpl{}
-
 	key := GetProductsKey(identifier)
 	var cachedMessage pb.GetProductsResponse
 	err = redis.ReadProtoMessage(ctx, key, &cachedMessage)
@@ -122,6 +121,12 @@ func (a apiRepository) StreamAllProductsCache(ctx context.Context, marketplaceId
 		_ = client.EnqueueFetchProductsTask(types.TypeWbFetchProducts, marketplaceId)
 		return
 	}
+	locker := *redis.Locker
+	_, cancel, err := locker.TryWithContext(ctx, fmt.Sprintf("wb:products:marketplace:%s:lock", key))
+	if err != nil {
+		return
+	}
+	defer cancel()
 
 	innerResultChan := make(chan []WbProduct)
 	innerErrChan := make(chan error)