[#9999] metabase: Fix db engine to pebble in iterators.go

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

pkg/local_object_storage/metabase/iterators.go

@@ -11,7 +11,6 @@ import (
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	"github.com/cockroachdb/pebble"
-	"github.com/dgraph-io/badger/v4"
 
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 )
@@ -68,61 +67,55 @@ func (db *DB) IterateCoveredByTombstones(ctx context.Context, tss map[string]oid
 		return ErrDegradedMode
 	}
 
-	return db.database.View(func(tx *badger.Txn) error {
-		return db.iterateCoveredByTombstones(ctx, tx, tss, h)
+	return db.snapshot(func(s *pebble.Snapshot) error {
+		return db.iterateCoveredByTombstones(ctx, s, tss, h)
 	})
 }
 
-func (db *DB) iterateCoveredByTombstones(ctx context.Context, tx *badger.Txn, tss map[string]oid.Address, h func(oid.Address) error) error {
+func (db *DB) iterateCoveredByTombstones(ctx context.Context, r pebble.Reader, tss map[string]oid.Address, h func(oid.Address) error) error {
 	prefix := []byte{graveyardPrefix}
-	it := tx.NewIterator(badger.IteratorOptions{
-		PrefetchSize:   badger.DefaultIteratorOptions.PrefetchSize,
-		Prefix:         prefix,
-		PrefetchValues: true,
+	it, err := r.NewIter(&pebble.IterOptions{
+		LowerBound: prefix,
 	})
-	defer it.Close()
+	if err != nil {
+		return err
+	}
 
-	for it.Seek(nil); it.ValidForPrefix(prefix); it.Next() {
+	for v := it.First(); v && bytes.HasPrefix(it.Key(), prefix); v = it.Next() {
 		select {
 		case <-ctx.Done():
-			return ctx.Err()
+			return errors.Join(ctx.Err(), it.Close())
 		default:
 		}
 
-		var tombstoneAddress oid.Address
-		if err := it.Item().Value(func(val []byte) error {
-			var e error
-			tombstoneAddress, e = decodeAddressFromGrave(val)
-			return e
-		}); err != nil {
-			return err
+		tombstoneAddress, err := decodeAddressFromGrave(it.Value())
+		if err != nil {
+			return errors.Join(err, it.Close())
 		}
 		if _, ok := tss[tombstoneAddress.EncodeToString()]; !ok {
 			continue
 		}
 
-		var objectAddress oid.Address
-		var err error
-		objectAddress, err = addressFromGraveyardKey(it.Item().Key())
+		objectAddress, err := addressFromGraveyardKey(it.Key())
 		if err != nil {
-			return err
+			return errors.Join(err, it.Close())
 		}
 
-		isLocked, err := objectLocked(ctx, tx, objectAddress.Container(), objectAddress.Object())
+		isLocked, err := objectLocked(ctx, r, objectAddress.Container(), objectAddress.Object())
 		if err != nil {
-			return err
+			return errors.Join(err, it.Close())
 		}
 		if isLocked {
 			continue
 		}
 		if err := h(objectAddress); err != nil {
 			if errors.Is(err, ErrInterruptIterator) {
-				return nil
+				return it.Close()
 			}
-			return err
+			return errors.Join(err, it.Close())
 		}
 	}
-	return nil
+	return it.Close()
 }
 
 func iteratePhyObjects(r pebble.Reader, f func(cid.ID, oid.ID, *objectSDK.Object) error) error {