Add Wildberries product fetching and rate limiting functionality

internal/tasks/wb/wb.go

@@ -0,0 +1,65 @@
+package wb
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"github.com/hibiken/asynq"
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/samber/lo"
+	pb "sipro-mps/api/generated/v1/wb/products"
+	mp_repo "sipro-mps/internal/marketplace"
+	"sipro-mps/internal/redis"
+	"sipro-mps/internal/tasks/types"
+	wb_products_repo "sipro-mps/internal/wb/products"
+	conv "sipro-mps/internal/wb/products/mapping/generated"
+)
+
+type FetchProductsProcessor struct {
+	Dbpool *pgxpool.Pool
+	wbRepo wb_products_repo.Repository
+}
+
+func (p *FetchProductsProcessor) ProcessTask(ctx context.Context, task *asynq.Task) error {
+	var payload types.FetchProductsTask
+	if err := json.Unmarshal(task.Payload(), &payload); err != nil {
+		return asynq.SkipRetry
+	}
+	marketplaceRepo := mp_repo.NewDBRepository(p.Dbpool)
+	repo := wb_products_repo.NewAPIRepository(marketplaceRepo)
+	_, sellerId, err := repo.ParseMarketplace(ctx, payload.MarketplaceId)
+	if err != nil {
+		return fmt.Errorf("failed to parse marketplace %d: %w", payload.MarketplaceId, err)
+	}
+	locker := *redis.Locker
+	_, cancel, err := locker.TryWithContext(ctx, fmt.Sprintf("wb:products:marketplace:%s:lock", sellerId))
+	if err != nil {
+		fmt.Printf("Failed to acquire lock for marketplace %s: %v\n", sellerId, err)
+		return asynq.SkipRetry
+
+	}
+	fmt.Println("Working on marketplace", payload.MarketplaceId, "with seller ID", sellerId)
+
+	defer cancel()
+
+	redisKey := fmt.Sprintf("wb:products:%s", sellerId)
+	productsRaw, err := repo.GetAllProducts(ctx, payload.MarketplaceId)
+	if err != nil {
+		return fmt.Errorf("failed to fetch products for marketplace %d: %w", payload.MarketplaceId, err)
+	}
+	converter := conv.ConverterImpl{}
+	products := lo.Map(productsRaw, func(item wb_products_repo.WbProduct, _ int) *pb.Product {
+		return converter.ToProto(&item)
+	})
+	redisClient := *redis.Client
+	productsJson, err := json.Marshal(products)
+	if err != nil {
+		return fmt.Errorf("failed to marshal products: %w", err)
+	}
+	err = redisClient.Do(ctx, redisClient.B().Set().Key(redisKey).Value(string(productsJson)).Build()).Error()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}