[#1410] engine: Provide the default implementation to MetricsRegister

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

pkg/local_object_storage/engine/container.go

@@ -68,9 +68,7 @@ func ContainerSize(e *StorageEngine, id cid.ID) (uint64, error) {
 }
 
 func (e *StorageEngine) containerSize(prm ContainerSizePrm) (res ContainerSizeRes, err error) {
-	if e.metrics != nil {
-		defer elapsed("EstimateContainerSize", e.metrics.AddMethodDuration)()
-	}
+	defer elapsed("EstimateContainerSize", e.metrics.AddMethodDuration)()
 
 	e.iterateOverUnsortedShards(func(sh hashedShard) (stop bool) {
 		var csPrm shard.ContainerSizePrm
@@ -116,9 +114,7 @@ func ListContainers(ctx context.Context, e *StorageEngine) ([]cid.ID, error) {
 }
 
 func (e *StorageEngine) listContainers(ctx context.Context) (ListContainersRes, error) {
-	if e.metrics != nil {
-		defer elapsed("ListContainers", e.metrics.AddMethodDuration)()
-	}
+	defer elapsed("ListContainers", e.metrics.AddMethodDuration)()
 
 	uniqueIDs := make(map[string]cid.ID)
 

pkg/local_object_storage/engine/delete.go

@@ -68,9 +68,7 @@ func (e *StorageEngine) Delete(ctx context.Context, prm DeletePrm) (res DeleteRe
 }
 
 func (e *StorageEngine) delete(ctx context.Context, prm DeletePrm) (DeleteRes, error) {
-	if e.metrics != nil {
-		defer elapsed("Delete", e.metrics.AddMethodDuration)()
-	}
+	defer elapsed("Delete", e.metrics.AddMethodDuration)()
 
 	var locked struct {
 		is bool

pkg/local_object_storage/engine/engine.go

@@ -219,6 +219,7 @@ func defaultCfg() *cfg {
 	res := &cfg{
 		log:           &logger.Logger{Logger: zap.L()},
 		shardPoolSize: 20,
+		metrics:       noopMetrics{},
 	}
 	res.containerSource.Store(&containerSource{})
 	return res

pkg/local_object_storage/engine/get.go

@@ -66,9 +66,7 @@ func (e *StorageEngine) Get(ctx context.Context, prm GetPrm) (res GetRes, err er
 }
 
 func (e *StorageEngine) get(ctx context.Context, prm GetPrm) (GetRes, error) {
-	if e.metrics != nil {
-		defer elapsed("Get", e.metrics.AddMethodDuration)()
-	}
+	defer elapsed("Get", e.metrics.AddMethodDuration)()
 
 	errNotFound := new(apistatus.ObjectNotFound)
 

pkg/local_object_storage/engine/head.go

@@ -68,9 +68,7 @@ func (e *StorageEngine) Head(ctx context.Context, prm HeadPrm) (res HeadRes, err
 func (e *StorageEngine) head(ctx context.Context, prm HeadPrm) (HeadRes, error) {
 	ctx, span := tracing.StartSpanFromContext(ctx, "StorageEngine.head")
 	defer span.End()
-	if e.metrics != nil {
-		defer elapsed("Head", e.metrics.AddMethodDuration)()
-	}
+	defer elapsed("Head", e.metrics.AddMethodDuration)()
 
 	var (
 		head     *objectSDK.Object

pkg/local_object_storage/engine/inhume.go

@@ -80,9 +80,7 @@ func (e *StorageEngine) Inhume(ctx context.Context, prm InhumePrm) (res InhumeRe
 }
 
 func (e *StorageEngine) inhume(ctx context.Context, prm InhumePrm) (InhumeRes, error) {
-	if e.metrics != nil {
-		defer elapsed("Inhume", e.metrics.AddMethodDuration)()
-	}
+	defer elapsed("Inhume", e.metrics.AddMethodDuration)()
 
 	var shPrm shard.InhumePrm
 	if prm.forceRemoval {

pkg/local_object_storage/engine/metrics.go

@@ -68,3 +68,48 @@ func (m *gcMetrics) AddExpiredObjectCollectionDuration(d time.Duration, success
 func (m *gcMetrics) AddInhumedObjectCount(count uint64, objectType string) {
 	m.storage.AddInhumedObjectCount(m.shardID, count, objectType)
 }
+
+type (
+	noopMetrics           struct{}
+	noopWriteCacheMetrics struct{}
+	noopGCMetrics         struct{}
+)
+
+var (
+	_ MetricRegister            = noopMetrics{}
+	_ metrics.WriteCacheMetrics = noopWriteCacheMetrics{}
+	_ metrics.GCMetrics         = noopGCMetrics{}
+)
+
+func (noopMetrics) AddMethodDuration(string, time.Duration)                  {}
+func (noopMetrics) SetObjectCounter(string, string, uint64)                  {}
+func (noopMetrics) AddToObjectCounter(string, string, int)                   {}
+func (noopMetrics) SetMode(string, mode.Mode)                                {}
+func (noopMetrics) AddToContainerSize(string, int64)                         {}
+func (noopMetrics) DeleteContainerSize(string)                               {}
+func (noopMetrics) DeleteContainerCount(string)                              {}
+func (noopMetrics) AddToPayloadCounter(string, int64)                        {}
+func (noopMetrics) IncErrorCounter(string)                                   {}
+func (noopMetrics) ClearErrorCounter(string)                                 {}
+func (noopMetrics) DeleteShardMetrics(string)                                {}
+func (noopMetrics) SetContainerObjectCounter(string, string, string, uint64) {}
+func (noopMetrics) IncContainerObjectCounter(string, string, string)         {}
+func (noopMetrics) SubContainerObjectCounter(string, string, string, uint64) {}
+func (noopMetrics) IncRefillObjectsCount(string, string, int, bool)          {}
+func (noopMetrics) SetRefillPercent(string, string, uint32)                  {}
+func (noopMetrics) SetRefillStatus(string, string, string)                   {}
+func (noopMetrics) SetEvacuationInProgress(string, bool)                     {}
+func (noopMetrics) WriteCache() metrics.WriteCacheMetrics                    { return noopWriteCacheMetrics{} }
+func (noopMetrics) GC() metrics.GCMetrics                                    { return noopGCMetrics{} }
+
+func (noopWriteCacheMetrics) AddMethodDuration(string, string, string, string, bool, time.Duration) {}
+func (noopWriteCacheMetrics) SetActualCount(string, string, string, uint64)                         {}
+func (noopWriteCacheMetrics) SetEstimateSize(string, string, string, uint64)                        {}
+func (noopWriteCacheMetrics) SetMode(string, string)                                                {}
+func (noopWriteCacheMetrics) IncOperationCounter(string, string, string, string, metrics.NullBool)  {}
+func (noopWriteCacheMetrics) Close(string, string)                                                  {}
+
+func (noopGCMetrics) AddRunDuration(string, time.Duration, bool)                             {}
+func (noopGCMetrics) AddDeletedCount(string, uint64, uint64)                                 {}
+func (noopGCMetrics) AddExpiredObjectCollectionDuration(string, time.Duration, bool, string) {}
+func (noopGCMetrics) AddInhumedObjectCount(string, uint64, string)                           {}

pkg/local_object_storage/engine/put.go

@@ -72,9 +72,7 @@ func (e *StorageEngine) Put(ctx context.Context, prm PutPrm) (err error) {
 }
 
 func (e *StorageEngine) put(ctx context.Context, prm PutPrm) error {
-	if e.metrics != nil {
-		defer elapsed("Put", e.metrics.AddMethodDuration)()
-	}
+	defer elapsed("Put", e.metrics.AddMethodDuration)()
 
 	addr := object.AddressOf(prm.obj)
 

pkg/local_object_storage/engine/range.go

@@ -82,9 +82,7 @@ func (e *StorageEngine) getRange(ctx context.Context, prm RngPrm) (RngRes, error
 		))
 	defer span.End()
 
-	if e.metrics != nil {
-		defer elapsed("GetRange", e.metrics.AddMethodDuration)()
-	}
+	defer elapsed("GetRange", e.metrics.AddMethodDuration)()
 
 	var shPrm shard.RngPrm
 	shPrm.SetAddress(prm.addr)

pkg/local_object_storage/engine/select.go

@@ -59,9 +59,7 @@ func (e *StorageEngine) Select(ctx context.Context, prm SelectPrm) (res SelectRe
 }
 
 func (e *StorageEngine) _select(ctx context.Context, prm SelectPrm) (SelectRes, error) {
-	if e.metrics != nil {
-		defer elapsed("Search", e.metrics.AddMethodDuration)()
-	}
+	defer elapsed("Search", e.metrics.AddMethodDuration)()
 
 	addrList := make([]oid.Address, 0)
 	uniqueMap := make(map[string]struct{})
@@ -108,9 +106,7 @@ func (e *StorageEngine) List(ctx context.Context, limit uint64) (res SelectRes,
 }
 
 func (e *StorageEngine) list(ctx context.Context, limit uint64) (SelectRes, error) {
-	if e.metrics != nil {
-		defer elapsed("ListObjects", e.metrics.AddMethodDuration)()
-	}
+	defer elapsed("ListObjects", e.metrics.AddMethodDuration)()
 
 	addrList := make([]oid.Address, 0, limit)
 	uniqueMap := make(map[string]struct{})

pkg/local_object_storage/engine/shards.go

@@ -116,9 +116,7 @@ func (e *StorageEngine) AddShard(ctx context.Context, opts ...shard.Option) (*sh
 		return nil, fmt.Errorf("could not add %s shard: %w", sh.ID().String(), err)
 	}
 
-	if e.cfg.metrics != nil {
-		e.cfg.metrics.SetMode(sh.ID().String(), sh.GetMode())
-	}
+	e.cfg.metrics.SetMode(sh.ID().String(), sh.GetMode())
 
 	return sh.ID(), nil
 }
@@ -152,28 +150,26 @@ func (e *StorageEngine) appendMetrics(id *shard.ID, opts []shard.Option) []shard
 	e.mtx.RLock()
 	defer e.mtx.RUnlock()
 
-	if e.metrics != nil {
-		opts = append(opts,
-			shard.WithMetricsWriter(
-				&metricsWithID{
-					id: id.String(),
-					mw: e.metrics,
-				},
-			),
-			shard.WithWriteCacheMetrics(
-				&writeCacheMetrics{
-					shardID: id.String(),
-					metrics: e.metrics.WriteCache(),
-				},
-			),
-			shard.WithGCMetrics(
-				&gcMetrics{
-					storage: e.metrics.GC(),
-					shardID: id.String(),
-				},
-			),
-		)
-	}
+	opts = append(opts,
+		shard.WithMetricsWriter(
+			&metricsWithID{
+				id: id.String(),
+				mw: e.metrics,
+			},
+		),
+		shard.WithWriteCacheMetrics(
+			&writeCacheMetrics{
+				shardID: id.String(),
+				metrics: e.metrics.WriteCache(),
+			},
+		),
+		shard.WithGCMetrics(
+			&gcMetrics{
+				storage: e.metrics.GC(),
+				shardID: id.String(),
+			},
+		),
+	)
 
 	return opts
 }