Merge pull request #54 from nspcc-dev/response-meta-header

Response meta header

docs/object.md

@@ -161,6 +161,10 @@ DeleteResponse is empty because we cannot guarantee permanent object removal
 in distributed system.
 
 
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
+
 
 <a name="object.GetRangeHashRequest"></a>
 
@@ -186,6 +190,7 @@ in distributed system.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | Hashes | [bytes](#bytes) | repeated | Hashes is a homomorphic hashes of all ranges |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
 
 <a name="object.GetRangeRequest"></a>
@@ -211,6 +216,7 @@ in distributed system.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | Fragment | [bytes](#bytes) |  | Fragment of object's payload |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
 
 <a name="object.GetRequest"></a>
@@ -237,6 +243,7 @@ in distributed system.
 | ----- | ---- | ----- | ----------- |
 | object | [Object](#object.Object) |  | Object header and some payload |
 | Chunk | [bytes](#bytes) |  | Chunk of remaining payload |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
 
 <a name="object.HeadRequest"></a>
@@ -263,6 +270,7 @@ in distributed system.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | Object | [Object](#object.Object) |  | Object without payload |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
 
 <a name="object.PutRequest"></a>
@@ -300,6 +308,7 @@ in distributed system.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | Address | [refs.Address](#refs.Address) |  | Address of object (container id + object id) |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
 
 <a name="object.SearchRequest"></a>
@@ -326,6 +335,7 @@ in distributed system.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | Addresses | [refs.Address](#refs.Address) | repeated | Addresses of found objects |
+| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) |  | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
 
  <!-- end messages -->
 

docs/service.md

@@ -7,6 +7,7 @@
 
   - Messages
     - [RequestMetaHeader](#service.RequestMetaHeader)
+    - [ResponseMetaHeader](#service.ResponseMetaHeader)
     
 
 - [service/verify.proto](#service/verify.proto)
@@ -49,6 +50,19 @@ RequestMetaHeader contains information about request meta headers
 | Epoch | [uint64](#uint64) |  | Epoch for user can be empty, because node sets epoch to the actual value |
 | Version | [uint32](#uint32) |  | Version defines protocol version TODO: not used for now, should be implemented in future |
 
+
+<a name="service.ResponseMetaHeader"></a>
+
+### Message ResponseMetaHeader
+ResponseMetaHeader contains meta information based on request processing by server
+(should be embedded into message)
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| Epoch | [uint64](#uint64) |  | Current NeoFS epoch on server |
+| Version | [uint32](#uint32) |  | Version defines protocol version TODO: not used for now, should be implemented in future |
+
  <!-- end messages -->
 
  <!-- end enums -->

object/service.pb.go

@@ -91,10 +91,12 @@ type GetResponse struct {
 	// Types that are valid to be assigned to R:
 	//	*GetResponse_Object
 	//	*GetResponse_Chunk
-	R                    isGetResponse_R `protobuf_oneof:"R"`
+	R isGetResponse_R `protobuf_oneof:"R"`
-	XXX_NoUnkeyedLiteral struct{}        `json:"-"`
+	// ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
-	XXX_unrecognized     []byte          `json:"-"`
+	service.ResponseMetaHeader `protobuf:"bytes,99,opt,name=Meta,proto3,embedded=Meta" json:"Meta"`
-	XXX_sizecache        int32           `json:"-"`
+	XXX_NoUnkeyedLiteral       struct{} `json:"-"`
+	XXX_unrecognized           []byte   `json:"-"`
+	XXX_sizecache              int32    `json:"-"`
 }
 
 func (m *GetResponse) Reset()         { *m = GetResponse{} }
@@ -314,10 +316,12 @@ func (m *PutRequest_PutHeader) GetToken() *session.Token {
 
 type PutResponse struct {
 	// Address of object (container id + object id)
-	Address              refs.Address `protobuf:"bytes,1,opt,name=Address,proto3" json:"Address"`
+	Address refs.Address `protobuf:"bytes,1,opt,name=Address,proto3" json:"Address"`
-	XXX_NoUnkeyedLiteral struct{}     `json:"-"`
+	// ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
-	XXX_unrecognized     []byte       `json:"-"`
+	service.ResponseMetaHeader `protobuf:"bytes,99,opt,name=Meta,proto3,embedded=Meta" json:"Meta"`
-	XXX_sizecache        int32        `json:"-"`
+	XXX_NoUnkeyedLiteral       struct{} `json:"-"`
+	XXX_unrecognized           []byte   `json:"-"`
+	XXX_sizecache              int32    `json:"-"`
 }
 
 func (m *PutResponse) Reset()         { *m = PutResponse{} }
@@ -418,9 +422,11 @@ func (m *DeleteRequest) GetToken() *session.Token {
 // DeleteResponse is empty because we cannot guarantee permanent object removal
 // in distributed system.
 type DeleteResponse struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	// ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
-	XXX_unrecognized     []byte   `json:"-"`
+	service.ResponseMetaHeader `protobuf:"bytes,99,opt,name=Meta,proto3,embedded=Meta" json:"Meta"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral       struct{} `json:"-"`
+	XXX_unrecognized           []byte   `json:"-"`
+	XXX_sizecache              int32    `json:"-"`
 }
 
 func (m *DeleteResponse) Reset()         { *m = DeleteResponse{} }
@@ -513,10 +519,12 @@ func (m *HeadRequest) GetRaw() bool {
 
 type HeadResponse struct {
 	// Object without payload
-	Object               *Object  `protobuf:"bytes,1,opt,name=Object,proto3" json:"Object,omitempty"`
+	Object *Object `protobuf:"bytes,1,opt,name=Object,proto3" json:"Object,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	// ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
-	XXX_unrecognized     []byte   `json:"-"`
+	service.ResponseMetaHeader `protobuf:"bytes,99,opt,name=Meta,proto3,embedded=Meta" json:"Meta"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral       struct{} `json:"-"`
+	XXX_unrecognized           []byte   `json:"-"`
+	XXX_sizecache              int32    `json:"-"`
 }
 
 func (m *HeadResponse) Reset()         { *m = HeadResponse{} }
@@ -616,10 +624,12 @@ func (m *SearchRequest) GetQueryVersion() uint32 {
 
 type SearchResponse struct {
 	// Addresses of found objects
-	Addresses            []refs.Address `protobuf:"bytes,1,rep,name=Addresses,proto3" json:"Addresses"`
+	Addresses []refs.Address `protobuf:"bytes,1,rep,name=Addresses,proto3" json:"Addresses"`
-	XXX_NoUnkeyedLiteral struct{}       `json:"-"`
+	// ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
-	XXX_unrecognized     []byte         `json:"-"`
+	service.ResponseMetaHeader `protobuf:"bytes,99,opt,name=Meta,proto3,embedded=Meta" json:"Meta"`
-	XXX_sizecache        int32          `json:"-"`
+	XXX_NoUnkeyedLiteral       struct{} `json:"-"`
+	XXX_unrecognized           []byte   `json:"-"`
+	XXX_sizecache              int32    `json:"-"`
 }
 
 func (m *SearchResponse) Reset()         { *m = SearchResponse{} }
@@ -717,10 +727,12 @@ func (m *GetRangeRequest) GetRange() Range {
 
 type GetRangeResponse struct {
 	// Fragment of object's payload
-	Fragment             []byte   `protobuf:"bytes,1,opt,name=Fragment,proto3" json:"Fragment,omitempty"`
+	Fragment []byte `protobuf:"bytes,1,opt,name=Fragment,proto3" json:"Fragment,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	// ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
-	XXX_unrecognized     []byte   `json:"-"`
+	service.ResponseMetaHeader `protobuf:"bytes,99,opt,name=Meta,proto3,embedded=Meta" json:"Meta"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral       struct{} `json:"-"`
+	XXX_unrecognized           []byte   `json:"-"`
+	XXX_sizecache              int32    `json:"-"`
 }
 
 func (m *GetRangeResponse) Reset()         { *m = GetRangeResponse{} }
@@ -827,10 +839,12 @@ func (m *GetRangeHashRequest) GetSalt() []byte {
 
 type GetRangeHashResponse struct {
 	// Hashes is a homomorphic hashes of all ranges
-	Hashes               []Hash   `protobuf:"bytes,1,rep,name=Hashes,proto3,customtype=Hash" json:"Hashes"`
+	Hashes []Hash `protobuf:"bytes,1,rep,name=Hashes,proto3,customtype=Hash" json:"Hashes"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	// ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
-	XXX_unrecognized     []byte   `json:"-"`
+	service.ResponseMetaHeader `protobuf:"bytes,99,opt,name=Meta,proto3,embedded=Meta" json:"Meta"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral       struct{} `json:"-"`
+	XXX_unrecognized           []byte   `json:"-"`
+	XXX_sizecache              int32    `json:"-"`
 }
 
 func (m *GetRangeHashResponse) Reset()         { *m = GetRangeHashResponse{} }
@@ -883,62 +897,64 @@ func init() {
 func init() { proto.RegisterFile("object/service.proto", fileDescriptor_dfcdf610ade6a9ce) }
 
 var fileDescriptor_dfcdf610ade6a9ce = []byte{
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+	0xa5, 0x80, 0xe3, 0xb8, 0xa9, 0xb7, 0x47, 0xaf, 0x66, 0xc1, 0xf8, 0x71, 0x53, 0x45, 0xd7, 0x48,
-	0x3f, 0x15, 0xfc, 0xce, 0x4d, 0x6e, 0xca, 0xb2, 0xfa, 0xd3, 0xbf, 0x0f, 0x8a, 0x62, 0x9d, 0xfd,
+	0xd6, 0xca, 0xf4, 0xcf, 0x64, 0xad, 0x6c, 0x73, 0x39, 0x42, 0xf8, 0x53, 0x28, 0x46, 0xe7, 0x81,
-	0xcb, 0x65, 0x03, 0x5d, 0x2d, 0x1b, 0xe8, 0xe7, 0x65, 0x03, 0xfd, 0xba, 0x6c, 0xa0, 0xef, 0x7e,
+	0xdf, 0x4e, 0xe7, 0x9e, 0xea, 0x00, 0x7a, 0xed, 0x75, 0x43, 0x1c, 0xa0, 0x0f, 0x5a, 0xfa, 0x40,
-	0x6b, 0xe4, 0xbe, 0x7c, 0x37, 0xf5, 0x21, 0xea, 0x06, 0x0b, 0xdb, 0x6e, 0x8d, 0xe9, 0x59, 0xdb,
+	0xf1, 0xdd, 0xeb, 0xdc, 0x54, 0xb5, 0xeb, 0xf7, 0xfe, 0xd9, 0x28, 0x82, 0x75, 0x9e, 0xbc, 0x5c,
-	0xa5, 0xde, 0x24, 0x68, 0x59, 0x0b, 0xa7, 0x2d, 0x2a, 0xfe, 0x90, 0xaf, 0xee, 0x53, 0x6f, 0x6f,
+	0xd6, 0xd1, 0xab, 0x65, 0x1d, 0xfd, 0xb2, 0xac, 0xa3, 0xdf, 0x96, 0x75, 0xf4, 0xfd, 0xef, 0xf5,
-	0x68, 0xbe, 0x3e, 0x1c, 0xc8, 0xeb, 0x79, 0xa4, 0xf2, 0x4f, 0xd3, 0x8f, 0xfe, 0x0a, 0x00, 0x00,
+	0x9d, 0xaf, 0xdf, 0x49, 0x7d, 0x26, 0x38, 0xfe, 0xdc, 0xb2, 0x5a, 0x23, 0x7a, 0xd1, 0x76, 0xa8,
-	0xff, 0xff, 0x4f, 0x13, 0xa2, 0x69, 0x4e, 0x0b, 0x00, 0x00,
+	0x3b, 0xf6, 0x5b, 0xe6, 0xdc, 0x6e, 0x8b, 0x88, 0x3f, 0xe6, 0x2a, 0x4f, 0xa8, 0x7b, 0x32, 0x30,
+	0x1e, 0x9d, 0xf5, 0xe5, 0x53, 0x34, 0x54, 0xf9, 0x87, 0xc3, 0x87, 0x7f, 0x07, 0x00, 0x00, 0xff,
+	0xff, 0xd3, 0xb9, 0x0e, 0x2b, 0xec, 0x0c, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -1498,6 +1514,18 @@ func (m *GetResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	{
+		size, err := m.ResponseMetaHeader.MarshalToSizedBuffer(dAtA[:i])
+		if err != nil {
+			return 0, err
+		}
+		i -= size
+		i = encodeVarintService(dAtA, i, uint64(size))
+	}
+	i--
+	dAtA[i] = 0x6
+	i--
+	dAtA[i] = 0x9a
 	if m.R != nil {
 		{
 			size := m.R.Size()
@@ -1719,6 +1747,18 @@ func (m *PutResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	{
+		size, err := m.ResponseMetaHeader.MarshalToSizedBuffer(dAtA[:i])
+		if err != nil {
+			return 0, err
+		}
+		i -= size
+		i = encodeVarintService(dAtA, i, uint64(size))
+	}
+	i--
+	dAtA[i] = 0x6
+	i--
+	dAtA[i] = 0x9a
 	{
 		size, err := m.Address.MarshalToSizedBuffer(dAtA[:i])
 		if err != nil {
@@ -1839,6 +1879,18 @@ func (m *DeleteResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	{
+		size, err := m.ResponseMetaHeader.MarshalToSizedBuffer(dAtA[:i])
+		if err != nil {
+			return 0, err
+		}
+		i -= size
+		i = encodeVarintService(dAtA, i, uint64(size))
+	}
+	i--
+	dAtA[i] = 0x6
+	i--
+	dAtA[i] = 0x9a
 	return len(dAtA) - i, nil
 }
 
@@ -1947,6 +1999,18 @@ func (m *HeadResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	{
+		size, err := m.ResponseMetaHeader.MarshalToSizedBuffer(dAtA[:i])
+		if err != nil {
+			return 0, err
+		}
+		i -= size
+		i = encodeVarintService(dAtA, i, uint64(size))
+	}
+	i--
+	dAtA[i] = 0x6
+	i--
+	dAtA[i] = 0x9a
 	if m.Object != nil {
 		{
 			size, err := m.Object.MarshalToSizedBuffer(dAtA[:i])
@@ -2059,6 +2123,18 @@ func (m *SearchResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	{
+		size, err := m.ResponseMetaHeader.MarshalToSizedBuffer(dAtA[:i])
+		if err != nil {
+			return 0, err
+		}
+		i -= size
+		i = encodeVarintService(dAtA, i, uint64(size))
+	}
+	i--
+	dAtA[i] = 0x6
+	i--
+	dAtA[i] = 0x9a
 	if len(m.Addresses) > 0 {
 		for iNdEx := len(m.Addresses) - 1; iNdEx >= 0; iNdEx-- {
 			{
@@ -2171,6 +2247,18 @@ func (m *GetRangeResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	{
+		size, err := m.ResponseMetaHeader.MarshalToSizedBuffer(dAtA[:i])
+		if err != nil {
+			return 0, err
+		}
+		i -= size
+		i = encodeVarintService(dAtA, i, uint64(size))
+	}
+	i--
+	dAtA[i] = 0x6
+	i--
+	dAtA[i] = 0x9a
 	if len(m.Fragment) > 0 {
 		i -= len(m.Fragment)
 		copy(dAtA[i:], m.Fragment)
@@ -2287,6 +2375,18 @@ func (m *GetRangeHashResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	{
+		size, err := m.ResponseMetaHeader.MarshalToSizedBuffer(dAtA[:i])
+		if err != nil {
+			return 0, err
+		}
+		i -= size
+		i = encodeVarintService(dAtA, i, uint64(size))
+	}
+	i--
+	dAtA[i] = 0x6
+	i--
+	dAtA[i] = 0x9a
 	if len(m.Hashes) > 0 {
 		for iNdEx := len(m.Hashes) - 1; iNdEx >= 0; iNdEx-- {
 			{
@@ -2345,6 +2445,8 @@ func (m *GetResponse) Size() (n int) {
 	if m.R != nil {
 		n += m.R.Size()
 	}
+	l = m.ResponseMetaHeader.Size()
+	n += 2 + l + sovService(uint64(l))
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -2446,6 +2548,8 @@ func (m *PutResponse) Size() (n int) {
 	_ = l
 	l = m.Address.Size()
 	n += 1 + l + sovService(uint64(l))
+	l = m.ResponseMetaHeader.Size()
+	n += 2 + l + sovService(uint64(l))
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -2482,6 +2586,8 @@ func (m *DeleteResponse) Size() (n int) {
 	}
 	var l int
 	_ = l
+	l = m.ResponseMetaHeader.Size()
+	n += 2 + l + sovService(uint64(l))
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -2522,6 +2628,8 @@ func (m *HeadResponse) Size() (n int) {
 		l = m.Object.Size()
 		n += 1 + l + sovService(uint64(l))
 	}
+	l = m.ResponseMetaHeader.Size()
+	n += 2 + l + sovService(uint64(l))
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -2565,6 +2673,8 @@ func (m *SearchResponse) Size() (n int) {
 			n += 1 + l + sovService(uint64(l))
 		}
 	}
+	l = m.ResponseMetaHeader.Size()
+	n += 2 + l + sovService(uint64(l))
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -2601,6 +2711,8 @@ func (m *GetRangeResponse) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovService(uint64(l))
 	}
+	l = m.ResponseMetaHeader.Size()
+	n += 2 + l + sovService(uint64(l))
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -2647,6 +2759,8 @@ func (m *GetRangeHashResponse) Size() (n int) {
 			n += 1 + l + sovService(uint64(l))
 		}
 	}
+	l = m.ResponseMetaHeader.Size()
+	n += 2 + l + sovService(uint64(l))
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -2929,6 +3043,39 @@ func (m *GetResponse) Unmarshal(dAtA []byte) error {
 			copy(v, dAtA[iNdEx:postIndex])
 			m.R = &GetResponse_Chunk{v}
 			iNdEx = postIndex
+		case 99:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ResponseMetaHeader", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowService
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthService
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthService
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if err := m.ResponseMetaHeader.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipService(dAtA[iNdEx:])
@@ -3330,6 +3477,39 @@ func (m *PutResponse) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 99:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ResponseMetaHeader", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowService
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthService
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthService
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if err := m.ResponseMetaHeader.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipService(dAtA[iNdEx:])
@@ -3606,6 +3786,39 @@ func (m *DeleteResponse) Unmarshal(dAtA []byte) error {
 			return fmt.Errorf("proto: DeleteResponse: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
+		case 99:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ResponseMetaHeader", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowService
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthService
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthService
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if err := m.ResponseMetaHeader.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipService(dAtA[iNdEx:])
@@ -3889,6 +4102,39 @@ func (m *HeadResponse) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 99:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ResponseMetaHeader", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowService
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthService
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthService
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if err := m.ResponseMetaHeader.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipService(dAtA[iNdEx:])
@@ -4183,6 +4429,39 @@ func (m *SearchResponse) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 99:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ResponseMetaHeader", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowService
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthService
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthService
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if err := m.ResponseMetaHeader.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipService(dAtA[iNdEx:])
@@ -4457,6 +4736,39 @@ func (m *GetRangeResponse) Unmarshal(dAtA []byte) error {
 				m.Fragment = []byte{}
 			}
 			iNdEx = postIndex
+		case 99:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ResponseMetaHeader", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowService
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthService
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthService
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if err := m.ResponseMetaHeader.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipService(dAtA[iNdEx:])
@@ -4767,6 +5079,39 @@ func (m *GetRangeHashResponse) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 99:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ResponseMetaHeader", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowService
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthService
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthService
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if err := m.ResponseMetaHeader.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipService(dAtA[iNdEx:])

object/service.proto

@@ -73,6 +73,9 @@ message GetResponse {
         // Chunk of remaining payload
         bytes Chunk   = 2;
     }
+
+    // ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
+    service.ResponseMetaHeader Meta = 99 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
 }
 
 message PutRequest {
@@ -99,6 +102,8 @@ message PutRequest {
 message PutResponse {
     // Address of object (container id + object id)
     refs.Address Address = 1 [(gogoproto.nullable) = false];
+    // ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
+    service.ResponseMetaHeader Meta = 99 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
 }
 message DeleteRequest {
     // Address of object (container id + object id)
@@ -115,7 +120,10 @@ message DeleteRequest {
 
 // DeleteResponse is empty because we cannot guarantee permanent object removal
 // in distributed system.
-message DeleteResponse {}
+message DeleteResponse {
+    // ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
+    service.ResponseMetaHeader Meta = 99 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
+}
 
 message HeadRequest {
     // Address of object (container id + object id)
@@ -132,6 +140,8 @@ message HeadRequest {
 message HeadResponse {
     // Object without payload
     Object Object = 1;
+    // ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
+    service.ResponseMetaHeader Meta = 99 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
 }
 
 message SearchRequest {
@@ -150,6 +160,8 @@ message SearchRequest {
 message SearchResponse {
     // Addresses of found objects
     repeated refs.Address Addresses = 1 [(gogoproto.nullable) = false];
+    // ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
+    service.ResponseMetaHeader Meta = 99 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
 }
 
 message GetRangeRequest {
@@ -166,6 +178,8 @@ message GetRangeRequest {
 message GetRangeResponse {
     // Fragment of object's payload
     bytes Fragment = 1;
+    // ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
+    service.ResponseMetaHeader Meta = 99 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
 }
 
 message GetRangeHashRequest {
@@ -184,5 +198,7 @@ message GetRangeHashRequest {
 message GetRangeHashResponse {
     // Hashes is a homomorphic hashes of all ranges
     repeated bytes Hashes = 1 [(gogoproto.customtype) = "Hash", (gogoproto.nullable) = false];
+    // ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)
+    service.ResponseMetaHeader Meta = 99 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
 }
 

service/meta.pb.go

@@ -88,14 +88,71 @@ func (m *RequestMetaHeader) GetVersion() uint32 {
 	return 0
 }
 
+// ResponseMetaHeader contains meta information based on request processing by server
+// (should be embedded into message)
+type ResponseMetaHeader struct {
+	// Current NeoFS epoch on server
+	Epoch uint64 `protobuf:"varint,1,opt,name=Epoch,proto3" json:"Epoch,omitempty"`
+	// Version defines protocol version
+	// TODO: not used for now, should be implemented in future
+	Version              uint32   `protobuf:"varint,2,opt,name=Version,proto3" json:"Version,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ResponseMetaHeader) Reset()         { *m = ResponseMetaHeader{} }
+func (m *ResponseMetaHeader) String() string { return proto.CompactTextString(m) }
+func (*ResponseMetaHeader) ProtoMessage()    {}
+func (*ResponseMetaHeader) Descriptor() ([]byte, []int) {
+	return fileDescriptor_a638867e7b43457c, []int{1}
+}
+func (m *ResponseMetaHeader) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *ResponseMetaHeader) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	b = b[:cap(b)]
+	n, err := m.MarshalToSizedBuffer(b)
+	if err != nil {
+		return nil, err
+	}
+	return b[:n], nil
+}
+func (m *ResponseMetaHeader) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ResponseMetaHeader.Merge(m, src)
+}
+func (m *ResponseMetaHeader) XXX_Size() int {
+	return m.Size()
+}
+func (m *ResponseMetaHeader) XXX_DiscardUnknown() {
+	xxx_messageInfo_ResponseMetaHeader.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ResponseMetaHeader proto.InternalMessageInfo
+
+func (m *ResponseMetaHeader) GetEpoch() uint64 {
+	if m != nil {
+		return m.Epoch
+	}
+	return 0
+}
+
+func (m *ResponseMetaHeader) GetVersion() uint32 {
+	if m != nil {
+		return m.Version
+	}
+	return 0
+}
+
 func init() {
 	proto.RegisterType((*RequestMetaHeader)(nil), "service.RequestMetaHeader")
+	proto.RegisterType((*ResponseMetaHeader)(nil), "service.ResponseMetaHeader")
 }
 
 func init() { proto.RegisterFile("service/meta.proto", fileDescriptor_a638867e7b43457c) }
 
 var fileDescriptor_a638867e7b43457c = []byte{
-	// 220 bytes of a gzipped FileDescriptorProto
+	// 244 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x12, 0x2a, 0x4e, 0x2d, 0x2a,
 	0xcb, 0x4c, 0x4e, 0xd5, 0xcf, 0x4d, 0x2d, 0x49, 0xd4, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0x62,
 	0x87, 0x8a, 0x49, 0xe9, 0xa6, 0x67, 0x96, 0x64, 0x94, 0x26, 0xe9, 0x25, 0xe7, 0xe7, 0xea, 0xa7,
@@ -104,12 +161,14 @@ var fileDescriptor_a638867e7b43457c = []byte{
 	0x48, 0x4d, 0x4c, 0x49, 0x2d, 0x12, 0x12, 0xe0, 0x62, 0x0e, 0x09, 0xf1, 0x91, 0x60, 0x54, 0x60,
 	0xd4, 0xe0, 0x0d, 0x02, 0x31, 0x85, 0x44, 0xb8, 0x58, 0x5d, 0x0b, 0xf2, 0x93, 0x33, 0x24, 0x98,
 	0x14, 0x18, 0x35, 0x58, 0x82, 0x20, 0x1c, 0x21, 0x09, 0x2e, 0xf6, 0xb0, 0xd4, 0xa2, 0xe2, 0xcc,
-	0xfc, 0x3c, 0x09, 0x66, 0xb0, 0x5a, 0x18, 0xd7, 0x29, 0xe0, 0xc4, 0x23, 0x39, 0xc6, 0x0b, 0x8f,
+	0xfc, 0x3c, 0x09, 0x66, 0xb0, 0x5a, 0x18, 0x57, 0xc9, 0x85, 0x4b, 0x28, 0x28, 0xb5, 0xb8, 0x20,
-	0xe4, 0x18, 0x6f, 0x3c, 0x92, 0x63, 0x7c, 0xf0, 0x48, 0x8e, 0x71, 0xc6, 0x63, 0x39, 0x86, 0x28,
+	0x3f, 0xaf, 0x38, 0x15, 0xc9, 0x5c, 0xb8, 0x29, 0x8c, 0x38, 0x4c, 0x61, 0x42, 0x31, 0xc5, 0x29,
-	0x35, 0x24, 0xb7, 0xe5, 0x15, 0x17, 0x24, 0x27, 0xeb, 0xa6, 0xa4, 0x96, 0xe9, 0xe7, 0xa5, 0xe6,
+	0xe0, 0xc4, 0x23, 0x39, 0xc6, 0x0b, 0x8f, 0xe4, 0x18, 0x6f, 0x3c, 0x92, 0x63, 0x7c, 0xf0, 0x48,
-	0xa7, 0x15, 0xeb, 0x26, 0x16, 0x64, 0xea, 0x43, 0xfd, 0xb0, 0x8a, 0x49, 0xd0, 0x2f, 0x35, 0xdf,
+	0x8e, 0x71, 0xc6, 0x63, 0x39, 0x86, 0x28, 0x35, 0x24, 0x1f, 0xe6, 0x15, 0x17, 0x24, 0x27, 0xeb,
-	0x2d, 0x58, 0xcf, 0x31, 0xc0, 0x53, 0x2f, 0x18, 0x22, 0x96, 0xc4, 0x06, 0x76, 0xaf, 0x31, 0x20,
+	0xa6, 0xa4, 0x96, 0xe9, 0xe7, 0xa5, 0xe6, 0xa7, 0x15, 0xeb, 0x26, 0x16, 0x64, 0xea, 0x43, 0x43,
-	0x00, 0x00, 0xff, 0xff, 0x78, 0x63, 0x03, 0x7b, 0xfd, 0x00, 0x00, 0x00,
+	0x62, 0x15, 0x93, 0xa0, 0x5f, 0x6a, 0xbe, 0x5b, 0xb0, 0x9e, 0x63, 0x80, 0xa7, 0x5e, 0x30, 0x44,
+	0x2c, 0x89, 0x0d, 0xec, 0x6b, 0x63, 0x40, 0x00, 0x00, 0x00, 0xff, 0xff, 0xd5, 0x3a, 0x21, 0x1a,
+	0x43, 0x01, 0x00, 0x00,
 }
 
 func (m *RequestMetaHeader) Marshal() (dAtA []byte, err error) {
@@ -154,6 +213,43 @@ func (m *RequestMetaHeader) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
+func (m *ResponseMetaHeader) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *ResponseMetaHeader) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *ResponseMetaHeader) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.XXX_unrecognized != nil {
+		i -= len(m.XXX_unrecognized)
+		copy(dAtA[i:], m.XXX_unrecognized)
+	}
+	if m.Version != 0 {
+		i = encodeVarintMeta(dAtA, i, uint64(m.Version))
+		i--
+		dAtA[i] = 0x10
+	}
+	if m.Epoch != 0 {
+		i = encodeVarintMeta(dAtA, i, uint64(m.Epoch))
+		i--
+		dAtA[i] = 0x8
+	}
+	return len(dAtA) - i, nil
+}
+
 func encodeVarintMeta(dAtA []byte, offset int, v uint64) int {
 	offset -= sovMeta(v)
 	base := offset
@@ -186,6 +282,24 @@ func (m *RequestMetaHeader) Size() (n int) {
 	return n
 }
 
+func (m *ResponseMetaHeader) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if m.Epoch != 0 {
+		n += 1 + sovMeta(uint64(m.Epoch))
+	}
+	if m.Version != 0 {
+		n += 1 + sovMeta(uint64(m.Version))
+	}
+	if m.XXX_unrecognized != nil {
+		n += len(m.XXX_unrecognized)
+	}
+	return n
+}
+
 func sovMeta(x uint64) (n int) {
 	return (math_bits.Len64(x|1) + 6) / 7
 }
@@ -303,6 +417,98 @@ func (m *RequestMetaHeader) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *ResponseMetaHeader) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowMeta
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: ResponseMetaHeader: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: ResponseMetaHeader: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Epoch", wireType)
+			}
+			m.Epoch = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowMeta
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Epoch |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 2:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Version", wireType)
+			}
+			m.Version = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowMeta
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Version |= uint32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipMeta(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthMeta
+			}
+			if (iNdEx + skippy) < 0 {
+				return ErrInvalidLengthMeta
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.XXX_unrecognized = append(m.XXX_unrecognized, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func skipMeta(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0

service/meta.proto

@@ -18,3 +18,13 @@ message RequestMetaHeader {
     // TODO: not used for now, should be implemented in future
     uint32 Version = 3;
 }
+
+// ResponseMetaHeader contains meta information based on request processing by server
+// (should be embedded into message)
+message ResponseMetaHeader {
+    // Current NeoFS epoch on server
+    uint64 Epoch   = 1;
+    // Version defines protocol version
+    // TODO: not used for now, should be implemented in future
+    uint32 Version = 2;
+}