[#725] writecache: Fix metric values

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

pkg/local_object_storage/engine/writecache.go

@@ -68,16 +68,10 @@ func (m *writeCacheMetrics) Get(d time.Duration, success bool, st writecache.Sto
 
 func (m *writeCacheMetrics) Delete(d time.Duration, success bool, st writecache.StorageType) {
 	m.metrics.AddMethodDuration(m.shardID, "Delete", success, d, st.String())
-	if success {
-		m.metrics.DecActualCount(m.shardID, st.String())
-	}
 }
 
 func (m *writeCacheMetrics) Put(d time.Duration, success bool, st writecache.StorageType) {
 	m.metrics.AddMethodDuration(m.shardID, "Put", success, d, st.String())
-	if success {
-		m.metrics.IncActualCount(m.shardID, st.String())
-	}
 }
 
 func (m *writeCacheMetrics) SetEstimateSize(db, fstree uint64) {
@@ -99,7 +93,6 @@ func (m *writeCacheMetrics) Flush(success bool, st writecache.StorageType) {
 }
 
 func (m *writeCacheMetrics) Evict(st writecache.StorageType) {
-	m.metrics.DecActualCount(m.shardID, st.String())
 	m.metrics.IncOperationCounter(m.shardID, "Evict", metrics.NullBool{}, st.String())
 }
 

pkg/local_object_storage/writecache/writecachebadger/delete.go

@@ -59,7 +59,7 @@ func (c *cache) Delete(ctx context.Context, addr oid.Address) error {
 					storagelog.OpField("db DELETE"),
 				)
 				deleted = true
-				c.objCounters.DecDB()
+				c.decDB()
 			}
 			return err
 		}

pkg/local_object_storage/writecache/writecachebadger/put.go

@@ -76,7 +76,7 @@ func (c *cache) put(obj objectInfo) error {
 			storagelog.StorageTypeField(wcStorageType),
 			storagelog.OpField("db PUT"),
 		)
-		c.objCounters.IncDB()
+		c.incDB()
 	}
 	return err
 }

pkg/local_object_storage/writecache/writecachebadger/state.go

@@ -55,3 +55,13 @@ func (c *cache) initCounters() error {
 
 	return nil
 }
+
+func (c *cache) incDB() {
+	c.objCounters.IncDB()
+	c.metrics.SetActualCounters(c.objCounters.DB(), 0)
+}
+
+func (c *cache) decDB() {
+	c.objCounters.DecDB()
+	c.metrics.SetActualCounters(c.objCounters.DB(), 0)
+}

pkg/local_object_storage/writecache/writecachebadger/storage.go

@@ -73,7 +73,7 @@ func (c *cache) deleteFromDB(keys []internalKey) []internalKey {
 	}
 
 	for i := 0; i < errorIndex; i++ {
-		c.objCounters.DecDB()
+		c.decDB()
 		c.metrics.Evict(writecache.StorageTypeDB)
 		storagelog.Write(c.log,
 			storagelog.AddressField(keys[i]),

pkg/local_object_storage/writecache/writecachebbolt/delete.go

@@ -83,6 +83,7 @@ func (c *cache) Delete(ctx context.Context, addr oid.Address) error {
 			storagelog.OpField("fstree DELETE"),
 		)
 		deleted = true
+		// counter changed by fstree
 		c.estimateCacheSize()
 	}
 	return metaerr.Wrap(err)

pkg/local_object_storage/writecache/writecachebbolt/flush.go

@@ -60,6 +60,7 @@ func (c *cache) runFlushLoop(ctx context.Context) {
 			case <-tt.C:
 				c.flushSmallObjects(ctx)
 				tt.Reset(defaultFlushInterval)
+				c.estimateCacheSize()
 			case <-ctx.Done():
 				return
 			}

pkg/local_object_storage/writecache/writecachebbolt/put.go

@@ -131,6 +131,7 @@ func (c *cache) putBig(ctx context.Context, addr string, prm common.PutPrm) erro
 		storagelog.StorageTypeField(wcStorageType),
 		storagelog.OpField("fstree PUT"),
 	)
+	// counter changed by fstree
 	c.estimateCacheSize()
 
 	return nil

pkg/local_object_storage/writecache/writecachebbolt/state.go

@@ -72,5 +72,6 @@ func (c *cache) initCounters() error {
 		return fmt.Errorf("could not read write-cache DB counter: %w", err)
 	}
 	c.objCounters.cDB.Store(inDB)
+	c.estimateCacheSize()
 	return nil
 }

pkg/local_object_storage/writecache/writecachebbolt/storage.go

@@ -73,7 +73,7 @@ func (c *cache) deleteFromDB(key string) {
 	err := c.db.Batch(func(tx *bbolt.Tx) error {
 		b := tx.Bucket(defaultBucket)
 		key := []byte(key)
-		recordDeleted = !recordDeleted && b.Get(key) != nil
+		recordDeleted = b.Get(key) != nil
 		return b.Delete(key)
 	})
 
@@ -122,6 +122,7 @@ func (c *cache) deleteFromDisk(ctx context.Context, keys []string) []string {
 				storagelog.OpField("fstree DELETE"),
 			)
 			c.metrics.Evict(writecache.StorageTypeFSTree)
+			// counter changed by fstree
 			c.estimateCacheSize()
 		}
 	}

pkg/metrics/writecache.go

@@ -10,16 +10,10 @@ import (
 
 type WriteCacheMetrics interface {
 	AddMethodDuration(shardID string, method string, success bool, d time.Duration, storageType string)
-
-	IncActualCount(shardID string, storageType string)
-	DecActualCount(shardID string, storageType string)
 	SetActualCount(shardID string, count uint64, storageType string)
-
 	SetEstimateSize(shardID string, size uint64, storageType string)
 	SetMode(shardID string, mode string)
-
 	IncOperationCounter(shardID string, operation string, success NullBool, storageType string)
-
 	Close(shardID string)
 }
 
@@ -65,20 +59,6 @@ func (m *writeCacheMetrics) AddMethodDuration(shardID string, method string, suc
 	).Observe(d.Seconds())
 }
 
-func (m *writeCacheMetrics) IncActualCount(shardID string, storageType string) {
-	m.actualCount.With(prometheus.Labels{
-		shardIDLabel: shardID,
-		storageLabel: storageType,
-	}).Inc()
-}
-
-func (m *writeCacheMetrics) DecActualCount(shardID string, storageType string) {
-	m.actualCount.With(prometheus.Labels{
-		shardIDLabel: shardID,
-		storageLabel: storageType,
-	}).Dec()
-}
-
 func (m *writeCacheMetrics) SetActualCount(shardID string, count uint64, storageType string) {
 	m.actualCount.With(prometheus.Labels{
 		shardIDLabel: shardID,