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