frostfs-api-go/v2/tombstone/marshal.go
Leonard Lyubich 6037a26a35 [#226] v2/tombstone: Implement unified message structure with methods
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-12-10 18:26:23 +03:00

83 lines
1.6 KiB
Go

package tombstone
import (
"github.com/nspcc-dev/neofs-api-go/util/proto"
tombstone "github.com/nspcc-dev/neofs-api-go/v2/tombstone/grpc"
goproto "google.golang.org/protobuf/proto"
)
const (
expFNum = 1
splitIDFNum = 2
membersFNum = 3
)
// StableMarshal marshals unified tombstone message in a protobuf
// compatible way without field order shuffle.
func (s *Tombstone) StableMarshal(buf []byte) ([]byte, error) {
if s == nil {
return []byte{}, nil
}
if buf == nil {
buf = make([]byte, s.StableSize())
}
var (
offset, n int
err error
)
n, err = proto.UInt64Marshal(expFNum, buf[offset:], s.exp)
if err != nil {
return nil, err
}
offset += n
n, err = proto.BytesMarshal(splitIDFNum, buf[offset:], s.splitID)
if err != nil {
return nil, err
}
offset += n
for i := range s.members {
n, err = proto.NestedStructureMarshal(membersFNum, buf[offset:], s.members[i])
if err != nil {
return nil, err
}
offset += n
}
return buf, nil
}
// StableSize returns size of tombstone message marshalled by StableMarshal function.
func (s *Tombstone) StableSize() (size int) {
if s == nil {
return 0
}
size += proto.UInt64Size(expFNum, s.exp)
size += proto.BytesSize(splitIDFNum, s.splitID)
for i := range s.members {
size += proto.NestedStructureSize(membersFNum, s.members[i])
}
return size
}
// Unmarshal unmarshal tombstone message from its binary representation.
func (s *Tombstone) Unmarshal(data []byte) error {
m := new(tombstone.Tombstone)
if err := goproto.Unmarshal(data, m); err != nil {
return err
}
*s = *TombstoneFromGRPCMessage(m)
return nil
}