frostfs-api-go-pogpp/v2/storagegroup/marshal.go
Leonard Lyubich 55948c2ab1 [#168] storageGroup: Implement binary/JSON encoders/decoders on SG
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-11-13 18:07:26 +03:00

91 lines
1.8 KiB
Go

package storagegroup
import (
"github.com/nspcc-dev/neofs-api-go/util/proto"
storagegroup "github.com/nspcc-dev/neofs-api-go/v2/storagegroup/grpc"
goproto "google.golang.org/protobuf/proto"
)
const (
sizeField = 1
hashField = 2
expirationField = 3
objectIDsField = 4
)
// StableMarshal marshals unified storage group structure in a protobuf
// compatible way without field order shuffle.
func (s *StorageGroup) 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(sizeField, buf[offset:], s.size)
if err != nil {
return nil, err
}
offset += n
n, err = proto.NestedStructureMarshal(hashField, buf[offset:], s.hash)
if err != nil {
return nil, err
}
offset += n
n, err = proto.UInt64Marshal(expirationField, buf[offset:], s.exp)
if err != nil {
return nil, err
}
offset += n
for i := range s.members {
n, err = proto.NestedStructureMarshal(objectIDsField, buf[offset:], s.members[i])
if err != nil {
return nil, err
}
offset += n
}
return buf, nil
}
// StableSize of storage group structure marshalled by StableMarshal function.
func (s *StorageGroup) StableSize() (size int) {
if s == nil {
return 0
}
size += proto.UInt64Size(sizeField, s.size)
size += proto.NestedStructureSize(hashField, s.hash)
size += proto.UInt64Size(expirationField, s.exp)
for i := range s.members {
size += proto.NestedStructureSize(objectIDsField, s.members[i])
}
return size
}
func (s *StorageGroup) Unmarshal(data []byte) error {
m := new(storagegroup.StorageGroup)
if err := goproto.Unmarshal(data, m); err != nil {
return err
}
*s = *StorageGroupFromGRPCMessage(m)
return nil
}