Refactor gRPC adapter to use connection pool and improve error handling in product retrieval

internal/ozon/products/adapter_grpc.go

@@ -1,6 +1,7 @@
 package products
 
 import (
+	"fmt"
 	"github.com/samber/lo"
 	"google.golang.org/grpc"
 	pb "sipro-mps/api/generated/v1/ozon/products"
@@ -26,20 +27,23 @@ func RegisterAdapterGRPC(server *grpc.Server, marketplaceRepo marketplace.Reposi
 	pb.RegisterProductsServiceServer(server, adapter)
 	return &apiRepo, nil
 }
-
 func (g *AdapterGRPC) GetListOfProducts(req *pb.GetListOfProductsRequest, stream pb.ProductsService_GetListOfProductsServer) error {
 	ctx := stream.Context()
+	fmt.Printf("GetListOfProducts called with req: %+v\n", req.MarketplaceId)
 	converter := generated.ConverterImpl{}
 	resultChan := make(chan []OzonProduct)
 	errChan := make(chan error)
-	g.repo.StreamAllProducts(ctx, 262, resultChan, errChan)
+
+	go g.repo.StreamAllProducts(ctx, int(req.MarketplaceId), resultChan, errChan) // Запускаем в горутине
+
 	for {
 		select {
 		case <-ctx.Done():
-			return ctx.Err() // Handle context cancellation
+			fmt.Println("GetListOfProducts: context cancelled or deadline exceeded:", ctx.Err())
+			return ctx.Err()
 		case products, ok := <-resultChan:
 			if !ok {
-				return nil
+				return nil // Завершаем, только если результат закрыт
 			}
 			protoProducts := lo.Map(products, func(product OzonProduct, _ int) *pb.Product {
 				return converter.ToProto(&product)
@@ -48,13 +52,12 @@ func (g *AdapterGRPC) GetListOfProducts(req *pb.GetListOfProductsRequest, stream
 				Products: protoProducts,
 			}
 			if err := stream.Send(resp); err != nil {
-				return err // Error sending response
+				fmt.Println("GetListOfProducts: error sending response:", err)
+				return err
 			}
 		case err, ok := <-errChan:
-			if !ok {
-				return nil // Exit loop when errChan is closed
-			}
-			if err != nil {
+			if ok && err != nil {
+				fmt.Println("GetListOfProducts: error received from channel:", err)
 				return err
 			}
 		}

internal/ozon/products/repository_api.go

@@ -31,8 +31,8 @@ func fetchProductIds(ctx context.Context, client *api.Client, resultChan chan<-
 		})
 		if err != nil {
 			// dev
-			panic(err)
-			//errChan <- fmt.Errorf("fetching product IDs: %w", err)
+			//panic(err)
+			errChan <- fmt.Errorf("fetching product IDs: %w", err)
 			return
 		}
 
@@ -65,8 +65,8 @@ func fetchProducts(ctx context.Context, client *api.Client, productIdsChan <-cha
 			})
 			if err != nil {
 				// dev
-				panic(err)
-				//errChan <- fmt.Errorf("fetching products: %w", err)
+				//panic(err)
+				errChan <- fmt.Errorf("fetching products: %w", err)
 				return
 			}
 			items := resp.Items

internal/ozon/rate_limiter.go

@@ -43,7 +43,6 @@ type RateLimitTransport struct {
 }
 
 func (t *RateLimitTransport) RoundTrip(req *http.Request) (*http.Response, error) {
-	fmt.Println(time.Now().Format("2006-01-02 15:04:05"))
 	ctx := req.Context()
 	clientId := req.Header.Get("Client-Id")
 	now := time.Now().UnixNano()
@@ -57,6 +56,7 @@ func (t *RateLimitTransport) RoundTrip(req *http.Request) (*http.Response, error
 		return nil, fmt.Errorf("failed to execute rate limit script: %w", err)
 	}
 	if waitTime > 0 {
+		fmt.Printf("Rate limit exceeded for client %s, waiting for %d nanoseconds\n", clientId, waitTime)
 		time.Sleep(time.Duration(waitTime))
 	}
 	return t.RoundTripper.RoundTrip(req)