package mailserver import ( whisper "github.com/status-im/whisper/whisperv6" "time" ) // DB is an interface to abstract interactions with the db so that the mailserver // is agnostic to the underlaying technology used type DB interface { Close() error // SaveEnvelope stores an envelope SaveEnvelope(*whisper.Envelope) error // GetEnvelope returns an rlp encoded envelope from the datastore GetEnvelope(*DBKey) ([]byte, error) // Prune removes envelopes older than time Prune(time.Time, int) (int, error) // BuildIterator returns an iterator over envelopes BuildIterator(query CursorQuery) (Iterator, error) } type Iterator interface { Next() bool DBKey() (*DBKey, error) Release() Error() error GetEnvelope(bloom []byte) ([]byte, error) } type CursorQuery struct { start []byte end []byte cursor []byte limit uint32 bloom []byte }