package meta import ( "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/metaerr" oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id" "go.etcd.io/bbolt" ) // GetChildren returns parent -> children map. // If an object has no children, then map will contain addr -> empty slice value. func (db *DB) GetChildren(addresses []oid.Address) (map[oid.Address][]oid.Address, error) { db.modeMtx.RLock() defer db.modeMtx.RUnlock() if db.mode.NoMetabase() { return nil, ErrDegradedMode } result := make(map[oid.Address][]oid.Address, len(addresses)) buffer := make([]byte, bucketKeySize) err := db.boltDB.View(func(tx *bbolt.Tx) error { for _, addr := range addresses { if _, found := result[addr]; found { continue } result[addr] = []oid.Address{} bkt := tx.Bucket(parentBucketName(addr.Container(), buffer)) if bkt == nil { continue } binObjIDs, err := decodeList(bkt.Get(objectKey(addr.Object(), buffer))) if err != nil { return err } for _, binObjID := range binObjIDs { var id oid.ID if err = id.Decode(binObjID); err != nil { return err } var resultAddress oid.Address resultAddress.SetContainer(addr.Container()) resultAddress.SetObject(id) result[addr] = append(result[addr], resultAddress) } } return nil }) if err != nil { return nil, metaerr.Wrap(err) } return result, nil }