[#1181] metabase: Remove unused CleanUp method

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/local_object_storage/metabase/cleanup.go

@@ -1,108 +0,0 @@
-package meta
-
-import (
-	"bytes"
-	"strings"
-
-	"go.etcd.io/bbolt"
-)
-
-// CleanUpPrm groups the parameters of CleanUp operation.
-type CleanUpPrm struct{}
-
-// CleanUpRes groups resulting values of CleanUp operation.
-type CleanUpRes struct{}
-
-// CleanUp removes empty buckets from metabase.
-func (db *DB) CleanUp(prm *CleanUpPrm) (res *CleanUpRes, err error) {
-	err = db.boltDB.Update(func(tx *bbolt.Tx) error {
-		return tx.ForEach(func(name []byte, b *bbolt.Bucket) error {
-			switch {
-			case isFKBTBucket(name):
-				cleanUpFKBT(tx, name, b)
-			case isListBucket(name):
-				cleanUpListBucket(tx, name, b)
-			default:
-				cleanUpUniqueBucket(tx, name, b)
-			}
-
-			return nil
-		})
-	})
-
-	return
-}
-
-func isFKBTBucket(name []byte) bool {
-	bucketName := string(name)
-
-	switch {
-	case
-		strings.Contains(bucketName, userAttributePostfix),
-		strings.Contains(bucketName, ownerPostfix):
-		return true
-	default:
-		return false
-	}
-}
-
-func isListBucket(name []byte) bool {
-	bucketName := string(name)
-
-	switch {
-	case
-		strings.Contains(bucketName, payloadHashPostfix),
-		strings.Contains(bucketName, parentPostfix):
-		return true
-	default:
-		return false
-	}
-}
-
-func cleanUpUniqueBucket(tx *bbolt.Tx, name []byte, b *bbolt.Bucket) {
-	switch { // clean well-known global metabase buckets
-	case bytes.Equal(name, containerVolumeBucketName):
-		_ = b.ForEach(func(k, v []byte) error {
-			if parseContainerSize(v) == 0 {
-				_ = b.Delete(k)
-			}
-
-			return nil
-		})
-	default:
-		// do nothing
-	}
-
-	if b.Stats().KeyN == 0 {
-		_ = tx.DeleteBucket(name) // ignore error, best effort there
-	}
-}
-
-func cleanUpFKBT(tx *bbolt.Tx, name []byte, b *bbolt.Bucket) {
-	removedBuckets := 0
-	remainingBuckets := b.Stats().BucketN - 1
-
-	_ = b.ForEach(func(k, _ []byte) error {
-		fkbtRoot := b.Bucket(k)
-		if fkbtRoot == nil {
-			return nil
-		}
-
-		if fkbtRoot.Stats().KeyN == 0 {
-			err := b.DeleteBucket(k)
-			if err == nil {
-				removedBuckets++
-			}
-		}
-
-		return nil
-	})
-
-	if remainingBuckets == removedBuckets {
-		_ = tx.DeleteBucket(name) // ignore error, best effort there
-	}
-}
-
-func cleanUpListBucket(tx *bbolt.Tx, name []byte, b *bbolt.Bucket) {
-	cleanUpUniqueBucket(tx, name, b)
-}