95 lines
1.9 KiB
Go
95 lines
1.9 KiB
Go
package storagegroup
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import (
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"encoding/binary"
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"github.com/nspcc-dev/neofs-api-go/util/proto"
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)
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const (
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// SizeField order number from storage group proto definition.
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SizeField = 1
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// HashField order number from storage group proto definition.
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HashField = 2
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// ExpirationField order number from storage group proto definition.
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ExpirationField = 3
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// ObjectIDsField order number from storage group proto definition.
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ObjectIDsField = 4
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)
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// StableMarshal marshals unified storage group structure in a protobuf
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// compatible way without field order shuffle.
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func (s *StorageGroup) StableMarshal(buf []byte) ([]byte, error) {
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if s == nil {
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return []byte{}, nil
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}
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if buf == nil {
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buf = make([]byte, s.StableSize())
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}
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var (
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offset, n int
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prefix uint64
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err error
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)
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n, err = proto.UInt64Marshal(SizeField, buf, s.size)
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if err != nil {
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return nil, err
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}
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offset += n
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n, err = proto.BytesMarshal(HashField, buf[offset:], s.hash)
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if err != nil {
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return nil, err
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}
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offset += n
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n, err = proto.UInt64Marshal(ExpirationField, buf[offset:], s.exp)
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if err != nil {
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return nil, err
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}
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offset += n
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prefix, _ = proto.NestedStructurePrefix(ObjectIDsField)
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for i := range s.members {
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offset += binary.PutUvarint(buf[offset:], prefix)
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n = s.members[i].StableSize()
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offset += binary.PutUvarint(buf[offset:], uint64(n))
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_, err = s.members[i].StableMarshal(buf[offset:])
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if err != nil {
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return nil, err
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}
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offset += n
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}
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return buf, nil
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}
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// StableSize of storage group structure marshalled by StableMarshal function.
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func (s *StorageGroup) StableSize() (size int) {
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if s == nil {
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return 0
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}
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size += proto.UInt64Size(SizeField, s.size)
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size += proto.BytesSize(HashField, s.hash)
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size += proto.UInt64Size(ExpirationField, s.exp)
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_, ln := proto.NestedStructurePrefix(ObjectIDsField)
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for i := range s.members {
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n := s.members[i].StableSize()
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size += ln + proto.VarUIntSize(uint64(n)) + n
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}
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return size
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}
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