fix: log device flow entities GC result if no auth entities collected

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

server/server.go

@@ -471,8 +471,8 @@ func (s *Server) startGarbageCollection(ctx context.Context, frequency time.Dura
 			case <-time.After(frequency):
 				if r, err := s.storage.GarbageCollect(now()); err != nil {
 					s.logger.Errorf("garbage collection failed: %v", err)
-				} else if r.AuthRequests > 0 || r.AuthCodes > 0 {
-					s.logger.Infof("garbage collection run, delete auth requests=%d, auth codes=%d, device requests =%d, device tokens=%d",
+				} else if !r.IsEmpty() {
+					s.logger.Infof("garbage collection run, delete auth requests=%d, auth codes=%d, device requests=%d, device tokens=%d",
 						r.AuthRequests, r.AuthCodes, r.DeviceRequests, r.DeviceTokens)
 				}
 			}

storage/storage.go

@@ -55,6 +55,14 @@ type GCResult struct {
 	DeviceTokens   int64
 }
 
+// IsEmpty returns whether the garbage collection result is empty or not.
+func (g *GCResult) IsEmpty() bool {
+	return g.AuthRequests == 0 &&
+		g.AuthCodes == 0 &&
+		g.DeviceRequests == 0 &&
+		g.DeviceTokens == 0
+}
+
 // Storage is the storage interface used by the server. Implementations are
 // required to be able to perform atomic compare-and-swap updates and either
 // support timezones or standardize on UTC.