status-go/mailserver/mailserver_db.go

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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
}