[#1410] shard: Provide the default implementation for MetricsWriter

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/local_object_storage/shard/id.go

@@ -45,9 +45,7 @@ func (s *Shard) UpdateID() (err error) {
 	}
 
 	shardID := s.info.ID.String()
-	if s.cfg.metricsWriter != nil {
 	s.cfg.metricsWriter.SetShardID(shardID)
-	}
 	if s.writeCache != nil && s.writeCache.GetMetrics() != nil {
 		s.writeCache.GetMetrics().SetShardID(shardID)
 	}

pkg/local_object_storage/shard/metrics.go

@@ -45,3 +45,25 @@ type MetricsWriter interface {
 	// SetEvacuationInProgress sets evacuation status
 	SetEvacuationInProgress(value bool)
 }
+
+type noopMetrics struct{}
+
+var _ MetricsWriter = noopMetrics{}
+
+func (noopMetrics) SetObjectCounter(string, uint64)                 {}
+func (noopMetrics) AddToObjectCounter(string, int)                  {}
+func (noopMetrics) AddToContainerSize(string, int64)                {}
+func (noopMetrics) AddToPayloadSize(int64)                          {}
+func (noopMetrics) IncObjectCounter(string)                         {}
+func (noopMetrics) SetShardID(string)                               {}
+func (noopMetrics) SetMode(mode.Mode)                               {}
+func (noopMetrics) IncErrorCounter()                                {}
+func (noopMetrics) ClearErrorCounter()                              {}
+func (noopMetrics) DeleteShardMetrics()                             {}
+func (noopMetrics) SetContainerObjectsCount(string, string, uint64) {}
+func (noopMetrics) IncContainerObjectsCount(string, string)         {}
+func (noopMetrics) SubContainerObjectsCount(string, string, uint64) {}
+func (noopMetrics) IncRefillObjectsCount(string, int, bool)         {}
+func (noopMetrics) SetRefillPercent(string, uint32)                 {}
+func (noopMetrics) SetRefillStatus(string, string)                  {}
+func (noopMetrics) SetEvacuationInProgress(bool)                    {}

pkg/local_object_storage/shard/mode.go

@@ -65,9 +65,7 @@ func (s *Shard) setMode(m mode.Mode) error {
 	}
 
 	s.info.Mode = m
-	if s.metricsWriter != nil {
 	s.metricsWriter.SetMode(s.info.Mode)
-	}
 
 	s.log.Info(logs.ShardShardModeSetSuccessfully,
 		zap.Stringer("mode", s.info.Mode))

pkg/local_object_storage/shard/shard.go

@@ -105,6 +105,7 @@ func defaultCfg() *cfg {
 		reportErrorFunc:             func(string, string, error) {},
 		zeroSizeContainersCallback:  func(context.Context, []cid.ID) {},
 		zeroCountContainersCallback: func(context.Context, []cid.ID) {},
+		metricsWriter:               noopMetrics{},
 	}
 }
 
@@ -384,7 +385,7 @@ const (
 )
 
 func (s *Shard) updateMetrics(ctx context.Context) {
-	if s.cfg.metricsWriter == nil || s.GetMode().NoMetabase() {
+	if s.GetMode().NoMetabase() {
 		return
 	}
 
@@ -439,7 +440,6 @@ func (s *Shard) updateMetrics(ctx context.Context) {
 // incObjectCounter increment both physical and logical object
 // counters.
 func (s *Shard) incObjectCounter(cnrID cid.ID, isUser bool) {
-	if s.cfg.metricsWriter != nil {
 	s.cfg.metricsWriter.IncObjectCounter(physical)
 	s.cfg.metricsWriter.IncObjectCounter(logical)
 	s.cfg.metricsWriter.IncContainerObjectsCount(cnrID.EncodeToString(), physical)
@@ -449,25 +449,20 @@ func (s *Shard) incObjectCounter(cnrID cid.ID, isUser bool) {
 		s.cfg.metricsWriter.IncContainerObjectsCount(cnrID.EncodeToString(), user)
 	}
 }
-}
 
 func (s *Shard) decObjectCounterBy(typ string, v uint64) {
-	if s.cfg.metricsWriter != nil && v > 0 {
+	if v > 0 {
 		s.cfg.metricsWriter.AddToObjectCounter(typ, -int(v))
 	}
 }
 
 func (s *Shard) setObjectCounterBy(typ string, v uint64) {
-	if s.cfg.metricsWriter != nil && v > 0 {
+	if v > 0 {
 		s.cfg.metricsWriter.SetObjectCounter(typ, v)
 	}
 }
 
 func (s *Shard) decContainerObjectCounter(byCnr map[cid.ID]meta.ObjectCounters) {
-	if s.cfg.metricsWriter == nil {
-		return
-	}
-
 	for cnrID, count := range byCnr {
 		if count.Phy > 0 {
 			s.cfg.metricsWriter.SubContainerObjectsCount(cnrID.EncodeToString(), physical, count.Phy)
@@ -482,46 +477,38 @@ func (s *Shard) decContainerObjectCounter(byCnr map[cid.ID]meta.ObjectCounters)
 }
 
 func (s *Shard) addToContainerSize(cnr string, size int64) {
-	if s.cfg.metricsWriter != nil && size != 0 {
+	if size != 0 {
 		s.cfg.metricsWriter.AddToContainerSize(cnr, size)
 	}
 }
 
 func (s *Shard) addToPayloadSize(size int64) {
-	if s.cfg.metricsWriter != nil && size != 0 {
+	if size != 0 {
 		s.cfg.metricsWriter.AddToPayloadSize(size)
 	}
 }
 
 func (s *Shard) setContainerObjectsCount(cnr string, typ string, v uint64) {
-	if s.cfg.metricsWriter != nil && v > 0 {
+	if v > 0 {
 		s.metricsWriter.SetContainerObjectsCount(cnr, typ, v)
 	}
 }
 
 func (s *Shard) IncErrorCounter() {
-	if s.cfg.metricsWriter != nil {
 	s.cfg.metricsWriter.IncErrorCounter()
 }
-}
 
 func (s *Shard) ClearErrorCounter() {
-	if s.cfg.metricsWriter != nil {
 	s.cfg.metricsWriter.ClearErrorCounter()
 }
-}
 
 func (s *Shard) DeleteShardMetrics() {
-	if s.cfg.metricsWriter != nil {
 	s.cfg.metricsWriter.DeleteShardMetrics()
 }
-}
 
 func (s *Shard) SetEvacuationInProgress(val bool) {
 	s.m.Lock()
 	defer s.m.Unlock()
 	s.info.EvacuationInProgress = val
-	if s.metricsWriter != nil {
 	s.metricsWriter.SetEvacuationInProgress(val)
 }
-}