[#585] writecache: Fix DB counter

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

pkg/local_object_storage/writecache/writecachebbolt/delete.go

@@ -2,6 +2,7 @@ package writecachebbolt
 
 import (
 	"context"
+	"math"
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
@@ -49,9 +50,12 @@ func (c *cache) Delete(ctx context.Context, addr oid.Address) error {
 
 	if dataSize > 0 {
 		storageType = writecache.StorageTypeDB
+		var recordDeleted bool
 		err := c.db.Update(func(tx *bbolt.Tx) error {
 			b := tx.Bucket(defaultBucket)
-			err := b.Delete([]byte(saddr))
+			key := []byte(saddr)
+			recordDeleted = b.Get(key) != nil
+			err := b.Delete(key)
 			return err
 		})
 		if err != nil {
@@ -62,6 +66,10 @@ func (c *cache) Delete(ctx context.Context, addr oid.Address) error {
 			storagelog.StorageTypeField(wcStorageType),
 			storagelog.OpField("db DELETE"),
 		)
+		if recordDeleted {
+			c.objCounters.cDB.Add(math.MaxUint64)
+			c.estimateCacheSize()
+		}
 		deleted = true
 		return nil
 	}
@@ -75,7 +83,7 @@ func (c *cache) Delete(ctx context.Context, addr oid.Address) error {
 			storagelog.OpField("fstree DELETE"),
 		)
 		deleted = true
+		c.estimateCacheSize()
 	}
-
 	return metaerr.Wrap(err)
 }

pkg/local_object_storage/writecache/writecachebbolt/put.go

@@ -85,9 +85,15 @@ func (c *cache) putSmall(obj objectInfo) error {
 		return ErrOutOfSpace
 	}
 
+	var newRecord bool
 	err := c.db.Batch(func(tx *bbolt.Tx) error {
 		b := tx.Bucket(defaultBucket)
-		return b.Put([]byte(obj.addr), obj.data)
+		key := []byte(obj.addr)
+		newRecord = b.Get(key) == nil
+		if newRecord {
+			return b.Put(key, obj.data)
+		}
+		return nil
 	})
 	if err == nil {
 		storagelog.Write(c.log,
@@ -95,6 +101,10 @@ func (c *cache) putSmall(obj objectInfo) error {
 			storagelog.StorageTypeField(wcStorageType),
 			storagelog.OpField("db PUT"),
 		)
+		if newRecord {
+			c.objCounters.cDB.Add(1)
+			c.estimateCacheSize()
+		}
 	}
 	return err
 }
@@ -121,6 +131,7 @@ func (c *cache) putBig(ctx context.Context, addr string, prm common.PutPrm) erro
 		storagelog.StorageTypeField(wcStorageType),
 		storagelog.OpField("fstree PUT"),
 	)
+	c.estimateCacheSize()
 
 	return nil
 }

pkg/local_object_storage/writecache/writecachebbolt/storage.go

@@ -3,6 +3,7 @@ package writecachebbolt
 import (
 	"context"
 	"fmt"
+	"math"
 	"os"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
@@ -68,9 +69,12 @@ func (c *cache) openStore(readOnly bool) error {
 }
 
 func (c *cache) deleteFromDB(key string) {
+	var recordDeleted bool
 	err := c.db.Batch(func(tx *bbolt.Tx) error {
 		b := tx.Bucket(defaultBucket)
-		return b.Delete([]byte(key))
+		key := []byte(key)
+		recordDeleted = !recordDeleted && b.Get(key) != nil
+		return b.Delete(key)
 	})
 
 	if err == nil {
@@ -80,7 +84,10 @@ func (c *cache) deleteFromDB(key string) {
 			storagelog.StorageTypeField(wcStorageType),
 			storagelog.OpField("db DELETE"),
 		)
+		if recordDeleted {
+			c.objCounters.cDB.Add(math.MaxUint64)
 			c.estimateCacheSize()
+		}
 	} else {
 		c.log.Error(logs.WritecacheCantRemoveObjectsFromTheDatabase, zap.Error(err))
 	}