[#373] blobovnicza: Add metrics

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/blobovnicza/blobovnicza.go

@@ -31,6 +31,8 @@ type cfg struct {
 	objSizeLimit uint64
 
 	log *logger.Logger
+
+	metrics Metrics
 }
 
 type boltDBCfg struct {
@@ -52,6 +54,7 @@ func defaultCfg(c *cfg) {
 		fullSizeLimit: 1 << 30, // 1GB
 		objSizeLimit:  1 << 20, // 1MB
 		log:           &logger.Logger{Logger: zap.L()},
+		metrics:       &noopMetrics{},
 	}
 }
 
@@ -112,3 +115,10 @@ func WithReadOnly(ro bool) Option {
 		c.boltOptions.ReadOnly = ro
 	}
 }
+
+// WithMetrics returns an option to set metrics storage.
+func WithMetrics(m Metrics) Option {
+	return func(c *cfg) {
+		c.metrics = m
+	}
+}

pkg/local_object_storage/blobovnicza/control.go

@@ -35,6 +35,9 @@ func (b *Blobovnicza) Open() error {
 	)
 
 	b.boltDB, err = bbolt.Open(b.path, b.perm, b.boltOptions)
+	if err == nil {
+		b.metrics.IncOpenCount()
+	}
 
 	return err
 }
@@ -81,7 +84,9 @@ func (b *Blobovnicza) Init() error {
 		return fmt.Errorf("can't determine DB size: %w", err)
 	}
 
-	b.filled.Store(uint64(info.Size()))
+	sz := uint64(info.Size())
+	b.filled.Store(sz)
+	b.metrics.IncSize(sz)
 	return err
 }
 
@@ -91,5 +96,10 @@ func (b *Blobovnicza) Close() error {
 		zap.String("path", b.path),
 	)
 
-	return b.boltDB.Close()
+	err := b.boltDB.Close()
+	if err == nil {
+		b.metrics.DecOpenCount()
+		b.metrics.DecSize(b.filled.Load())
+	}
+	return err
 }

pkg/local_object_storage/blobovnicza/metrics.go

@@ -0,0 +1,16 @@
+package blobovnicza
+
+type Metrics interface {
+	IncOpenCount()
+	DecOpenCount()
+
+	IncSize(size uint64)
+	DecSize(size uint64)
+}
+
+type noopMetrics struct{}
+
+func (m *noopMetrics) IncOpenCount()  {}
+func (m *noopMetrics) DecOpenCount()  {}
+func (m *noopMetrics) IncSize(uint64) {}
+func (m *noopMetrics) DecSize(uint64) {}

pkg/local_object_storage/blobovnicza/sizes.go

@@ -41,10 +41,12 @@ func upperPowerOfTwo(v uint64) uint64 {
 
 func (b *Blobovnicza) incSize(sz uint64) {
 	b.filled.Add(sz)
+	b.metrics.IncSize(sz)
 }
 
 func (b *Blobovnicza) decSize(sz uint64) {
 	b.filled.Add(^(sz - 1))
+	b.metrics.DecSize(sz)
 }
 
 func (b *Blobovnicza) full() bool {

pkg/local_object_storage/engine/shards.go

@@ -102,10 +102,30 @@ func (e *StorageEngine) createShard(opts []shard.Option) (*shard.Shard, error) {
 		return nil, fmt.Errorf("could not generate shard ID: %w", err)
 	}
 
+	opts = e.appendMetrics(id, opts)
+
+	sh := shard.New(append(opts,
+		shard.WithID(id),
+		shard.WithExpiredTombstonesCallback(e.processExpiredTombstones),
+		shard.WithExpiredLocksCallback(e.processExpiredLocks),
+		shard.WithDeletedLockCallback(e.processDeletedLocks),
+		shard.WithReportErrorFunc(e.reportShardErrorBackground),
+	)...)
+
+	if err := sh.UpdateID(); err != nil {
+		return nil, fmt.Errorf("could not update shard ID: %w", err)
+	}
+
+	return sh, err
+}
+
+func (e *StorageEngine) appendMetrics(id *shard.ID, opts []shard.Option) []shard.Option {
 	e.mtx.RLock()
+	defer e.mtx.RUnlock()
 
 	if e.metrics != nil {
-		opts = append(opts, shard.WithMetricsWriter(
+		opts = append(opts,
+			shard.WithMetricsWriter(
 				&metricsWithID{
 					id: id.String(),
 					mw: e.metrics,
@@ -126,21 +146,7 @@ func (e *StorageEngine) createShard(opts []shard.Option) (*shard.Shard, error) {
 		)
 	}
 
-	e.mtx.RUnlock()
-
-	sh := shard.New(append(opts,
-		shard.WithID(id),
-		shard.WithExpiredTombstonesCallback(e.processExpiredTombstones),
-		shard.WithExpiredLocksCallback(e.processExpiredLocks),
-		shard.WithDeletedLockCallback(e.processDeletedLocks),
-		shard.WithReportErrorFunc(e.reportShardErrorBackground),
-	)...)
-
-	if err := sh.UpdateID(); err != nil {
-		return nil, fmt.Errorf("could not update shard ID: %w", err)
-	}
-
-	return sh, err
+	return opts
 }
 
 func (e *StorageEngine) addShard(sh *shard.Shard) error {