package meta import ( "github.com/nspcc-dev/neo-go/pkg/util/slice" "go.etcd.io/bbolt" ) var ( shardInfoBucket = []byte{shardInfoPrefix} shardIDKey = []byte("id") ) // ReadShardID reads shard id from db. // If id is missing, returns nil, nil. func (db *DB) ReadShardID() ([]byte, error) { var id []byte err := db.boltDB.View(func(tx *bbolt.Tx) error { b := tx.Bucket(shardInfoBucket) if b != nil { id = slice.Copy(b.Get(shardIDKey)) } return nil }) return id, err } // WriteShardID writes shard it to db. func (db *DB) WriteShardID(id []byte) error { return db.boltDB.Update(func(tx *bbolt.Tx) error { b, err := tx.CreateBucketIfNotExists(shardInfoBucket) if err != nil { return err } return b.Put(shardIDKey, id) }) }