resolve issue #110

- TODO: add description
- TODO: add info into CHANGES file

api.go

@@ -327,7 +327,7 @@ func (r *Router) Call(ctx context.Context, bucketID uint64, mode VshardCallMode,
 				if vshardError.Destination != "" {
 					destinationUUID, err := uuid.Parse(vshardError.Destination)
 					if err != nil {
-						return nil, nil, fmt.Errorf("protocol violation %s: malformed destination %w: %w",
+						return VshardCallResp{}, fmt.Errorf("protocol violation %s: malformed destination %w: %w",
 							vshardStorageClientCall, vshardError, err)
 					}
 
@@ -351,8 +351,8 @@ func (r *Router) Call(ctx context.Context, bucketID uint64, mode VshardCallMode,
 						const defaultPoolingPause = 50 * time.Millisecond
 						time.Sleep(defaultPoolingPause)
 
-						if time.Since(timeStart) > timeout {
-							return nil, nil, vshardError
+						if spent := time.Since(requestStartTime); spent > timeout {
+							return VshardCallResp{}, vshardError
 						}
 					}
 				}

api_test.go

@@ -67,7 +67,7 @@ func TestRouter_RouterCallImpl(t *testing.T) {
 			conn: mPool,
 		})
 
-		_, _, err := r.RouterCallImpl(ctx, 5, CallOpts{Timeout: time.Second}, "test", []byte("test"))
+		_, _, err := r.RouterCallImpl(ctx, 5, CallOpts{Timeout: time.Second, VshardMode: ReadMode}, "test", []byte("test"))
 		require.ErrorIs(t, err, futureError)
 	})
 }