package meta import ( objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object" "go.etcd.io/bbolt" ) // Exists returns ErrAlreadyRemoved if addr was marked as removed. Otherwise it // returns true if addr is in primary index or false if it is not. func (db *DB) Exists(addr *objectSDK.Address) (exists bool, err error) { err = db.boltDB.View(func(tx *bbolt.Tx) error { exists, err = db.exists(tx, addr) return err }) return exists, err } func (db *DB) exists(tx *bbolt.Tx, addr *objectSDK.Address) (exists bool, err error) { // check graveyard first if inGraveyard(tx, addr) { return false, ErrAlreadyRemoved } objKey := objectKey(addr.ObjectID()) // if graveyard is empty, then check if object exists in primary bucket if inBucket(tx, primaryBucketName(addr.ContainerID()), objKey) { return true, nil } // if primary bucket is empty, then check if object exists in parent bucket if inBucket(tx, parentBucketName(addr.ContainerID()), objKey) { return true, nil } // if parent bucket is empty, then check if object exists in tombstone bucket if inBucket(tx, tombstoneBucketName(addr.ContainerID()), objKey) { return true, nil } // if parent bucket is empty, then check if object exists in storage group bucket return inBucket(tx, storageGroupBucketName(addr.ContainerID()), objKey), nil } // inGraveyard returns true if object was marked as removed. func inGraveyard(tx *bbolt.Tx, addr *objectSDK.Address) bool { graveyard := tx.Bucket(graveyardBucketName) if graveyard == nil { return false } tombstone := graveyard.Get(addressKey(addr)) return len(tombstone) != 0 } // inBucket checks if key is present in bucket . func inBucket(tx *bbolt.Tx, name, key []byte) bool { bkt := tx.Bucket(name) if bkt == nil { return false } // using `get` as `exists`: https://github.com/boltdb/bolt/issues/321 val := bkt.Get(key) return len(val) != 0 }