status-go/mailserver/db_key.go

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package mailserver
import (
"encoding/binary"
"errors"
"github.com/ethereum/go-ethereum/common"
whisper "github.com/status-im/whisper/whisperv6"
)
const (
// DBKeyLength is a size of the envelope key.
DBKeyLength = common.HashLength + timestampLength + whisper.TopicLength
CursorLength = common.HashLength + timestampLength
)
var (
// ErrInvalidByteSize is returned when DBKey can't be created
// from a byte slice because it has invalid length.
ErrInvalidByteSize = errors.New("byte slice has invalid length")
)
// DBKey key to be stored in a db.
type DBKey struct {
raw []byte
}
// Bytes returns a bytes representation of the DBKey.
func (k *DBKey) Bytes() []byte {
return k.raw
}
func (k *DBKey) Topic() whisper.TopicType {
return whisper.BytesToTopic(k.raw[timestampLength+common.HashLength:])
}
func (k *DBKey) EnvelopeHash() common.Hash {
return common.BytesToHash(k.raw[timestampLength : common.HashLength+timestampLength])
}
func (k *DBKey) Cursor() []byte {
// We don't use the whole cursor for backward compatibility (also it's not needed)
return k.raw[:CursorLength]
}
// NewDBKey creates a new DBKey with the given values.
func NewDBKey(timestamp uint32, topic whisper.TopicType, h common.Hash) *DBKey {
var k DBKey
k.raw = make([]byte, DBKeyLength)
binary.BigEndian.PutUint32(k.raw, timestamp)
copy(k.raw[timestampLength:], h[:])
copy(k.raw[timestampLength+common.HashLength:], topic[:])
return &k
}