Merge pull request #51 from nspcc-dev/add-method-to-state-service-to-dump-debug-variables

Add method to state service to dump debug variables

Makefile

@@ -14,7 +14,6 @@ deps:
 	@go mod vendor
 
 	@echo "${B}${G}=> Cleanup old files ${R}"
-	@find . -type f -name '*.pb.go' -not -path './vendor/*' -exec rm {} \;
 	@find . -type f -name '*.proto' -not -path './vendor/*' -not -name '*_test.proto' -exec rm {} \;
 
 	@echo "${B}${G}=> NeoFS Proto files ${R}"
@@ -49,6 +48,9 @@ docgen: deps
 
 # Regenerate proto files:
 protoc: deps
+	@echo "${B}${G}=> Cleanup old files ${R}"
+	@find . -type f -name '*.pb.go' -not -path './vendor/*' -exec rm {} \;
+
 	@echo "${B}${G}=> Install specific version for gogo-proto ${R}"
 	@go list -f '{{.Path}}/...@{{.Version}}' -m github.com/gogo/protobuf | xargs go get -v
 	@echo "${B}${G}=> Install specific version for protobuf lib ${R}"
@@ -60,3 +62,5 @@ protoc: deps
 			--proto_path=.:./vendor:/usr/local/include \
             --gofast_out=plugins=grpc,paths=source_relative:. $$f; \
 	done
+
+update: docgen protoc

docs/state.md

@@ -10,6 +10,8 @@
   - Messages
     - [DumpRequest](#state.DumpRequest)
     - [DumpResponse](#state.DumpResponse)
+    - [DumpVarsRequest](#state.DumpVarsRequest)
+    - [DumpVarsResponse](#state.DumpVarsResponse)
     - [HealthRequest](#state.HealthRequest)
     - [HealthResponse](#state.HealthResponse)
     - [MetricsRequest](#state.MetricsRequest)
@@ -39,6 +41,7 @@ rpc Netmap(NetmapRequest) returns (.bootstrap.SpreadMap);
 rpc Metrics(MetricsRequest) returns (MetricsResponse);
 rpc HealthCheck(HealthRequest) returns (HealthResponse);
 rpc DumpConfig(DumpRequest) returns (DumpResponse);
+rpc DumpVars(DumpVarsRequest) returns (DumpVarsResponse);
 
 ```
 
@@ -73,6 +76,15 @@ The request should be signed.
 | Name | Input | Output |
 | ---- | ----- | ------ |
 | DumpConfig | [DumpRequest](#state.DumpRequest) | [DumpResponse](#state.DumpResponse) |
+#### Method DumpVars
+
+DumpVars returns debug variables for the current node.
+To permit access, used server config options.
+The request should be signed.
+
+| Name | Input | Output |
+| ---- | ----- | ------ |
+| DumpVars | [DumpVarsRequest](#state.DumpVarsRequest) | [DumpVarsResponse](#state.DumpVarsResponse) |
  <!-- end services -->
 
 
@@ -100,6 +112,30 @@ Config stored in JSON encoded into slice of bytes.
 | Config | [bytes](#bytes) |  |  |
 
 
+<a name="state.DumpVarsRequest"></a>
+
+### Message DumpVarsRequest
+DumpVarsRequest message to fetch current server debug variables.
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| Meta | [service.RequestMetaHeader](#service.RequestMetaHeader) |  | RequestMetaHeader contains information about request meta headers (should be embedded into message) |
+| Verify | [service.RequestVerificationHeader](#service.RequestVerificationHeader) |  | RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message) |
+
+
+<a name="state.DumpVarsResponse"></a>
+
+### Message DumpVarsResponse
+DumpVarsResponse message contains current server debug variables.
+Variables stored in JSON encoded into slice of bytes.
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| Variables | [bytes](#bytes) |  |  |
+
+
 <a name="state.HealthRequest"></a>
 
 ### Message HealthRequest

state/service.go

@@ -1,7 +1,10 @@
 package state
 
 import (
+	"bytes"
 	"encoding/json"
+	"expvar"
+	"fmt"
 
 	"github.com/golang/protobuf/proto"
 	"github.com/prometheus/client_golang/prometheus"
@@ -61,3 +64,25 @@ func EncodeConfig(v *viper.Viper) (*DumpResponse, error) {
 
 	return &DumpResponse{Config: data}, nil
 }
+
+// EncodeVariables encodes debug variables into DumpVarsResponse message.
+// Variables encoded into JSON and stored as slice of bytes.
+func EncodeVariables() *DumpVarsResponse {
+	buf := new(bytes.Buffer)
+	buf.WriteString("{\n")
+	first := true
+
+	expvar.Do(func(kv expvar.KeyValue) {
+		if !first {
+			buf.WriteString(",\n")
+		}
+
+		first = false
+
+		_, _ = fmt.Fprintf(buf, "%q: %s", kv.Key, kv.Value)
+	})
+
+	buf.WriteString("\n}\n")
+
+	return &DumpVarsResponse{Variables: buf.Bytes()}
+}

state/service.pb.go

@@ -334,6 +334,91 @@ func (m *DumpResponse) GetConfig() []byte {
 	return nil
 }
 
+// DumpVarsRequest message to fetch current server debug variables.
+type DumpVarsRequest struct {
+	// RequestMetaHeader contains information about request meta headers (should be embedded into message)
+	service.RequestMetaHeader `protobuf:"bytes,98,opt,name=Meta,proto3,embedded=Meta" json:"Meta"`
+	// RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message)
+	service.RequestVerificationHeader `protobuf:"bytes,99,opt,name=Verify,proto3,embedded=Verify" json:"Verify"`
+	XXX_NoUnkeyedLiteral              struct{} `json:"-"`
+	XXX_unrecognized                  []byte   `json:"-"`
+	XXX_sizecache                     int32    `json:"-"`
+}
+
+func (m *DumpVarsRequest) Reset()         { *m = DumpVarsRequest{} }
+func (m *DumpVarsRequest) String() string { return proto.CompactTextString(m) }
+func (*DumpVarsRequest) ProtoMessage()    {}
+func (*DumpVarsRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_695592f6f2fc97b7, []int{7}
+}
+func (m *DumpVarsRequest) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *DumpVarsRequest) 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 *DumpVarsRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_DumpVarsRequest.Merge(m, src)
+}
+func (m *DumpVarsRequest) XXX_Size() int {
+	return m.Size()
+}
+func (m *DumpVarsRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_DumpVarsRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_DumpVarsRequest proto.InternalMessageInfo
+
+// DumpVarsResponse message contains current server debug variables.
+// Variables stored in JSON encoded into slice of bytes.
+type DumpVarsResponse struct {
+	Variables            []byte   `protobuf:"bytes,1,opt,name=Variables,proto3" json:"Variables,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *DumpVarsResponse) Reset()         { *m = DumpVarsResponse{} }
+func (m *DumpVarsResponse) String() string { return proto.CompactTextString(m) }
+func (*DumpVarsResponse) ProtoMessage()    {}
+func (*DumpVarsResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_695592f6f2fc97b7, []int{8}
+}
+func (m *DumpVarsResponse) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *DumpVarsResponse) 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 *DumpVarsResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_DumpVarsResponse.Merge(m, src)
+}
+func (m *DumpVarsResponse) XXX_Size() int {
+	return m.Size()
+}
+func (m *DumpVarsResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_DumpVarsResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_DumpVarsResponse proto.InternalMessageInfo
+
+func (m *DumpVarsResponse) GetVariables() []byte {
+	if m != nil {
+		return m.Variables
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*NetmapRequest)(nil), "state.NetmapRequest")
 	proto.RegisterType((*MetricsRequest)(nil), "state.MetricsRequest")
@@ -342,42 +427,47 @@ func init() {
 	proto.RegisterType((*HealthResponse)(nil), "state.HealthResponse")
 	proto.RegisterType((*DumpRequest)(nil), "state.DumpRequest")
 	proto.RegisterType((*DumpResponse)(nil), "state.DumpResponse")
+	proto.RegisterType((*DumpVarsRequest)(nil), "state.DumpVarsRequest")
+	proto.RegisterType((*DumpVarsResponse)(nil), "state.DumpVarsResponse")
 }
 
 func init() { proto.RegisterFile("state/service.proto", fileDescriptor_695592f6f2fc97b7) }
 
 var fileDescriptor_695592f6f2fc97b7 = []byte{
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+	// 527 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xcc, 0x94, 0xcf, 0x6e, 0xd3, 0x40,
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -403,6 +493,10 @@ type StatusClient interface {
 	// To permit access, used server config options.
 	// The request should be signed.
 	DumpConfig(ctx context.Context, in *DumpRequest, opts ...grpc.CallOption) (*DumpResponse, error)
+	// DumpVars returns debug variables for the current node.
+	// To permit access, used server config options.
+	// The request should be signed.
+	DumpVars(ctx context.Context, in *DumpVarsRequest, opts ...grpc.CallOption) (*DumpVarsResponse, error)
 }
 
 type statusClient struct {
@@ -449,6 +543,15 @@ func (c *statusClient) DumpConfig(ctx context.Context, in *DumpRequest, opts ...
 	return out, nil
 }
 
+func (c *statusClient) DumpVars(ctx context.Context, in *DumpVarsRequest, opts ...grpc.CallOption) (*DumpVarsResponse, error) {
+	out := new(DumpVarsResponse)
+	err := c.cc.Invoke(ctx, "/state.Status/DumpVars", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // StatusServer is the server API for Status service.
 type StatusServer interface {
 	// Netmap request allows to receive current [bootstrap.SpreadMap](bootstrap.md#bootstrap.SpreadMap)
@@ -462,6 +565,10 @@ type StatusServer interface {
 	// To permit access, used server config options.
 	// The request should be signed.
 	DumpConfig(context.Context, *DumpRequest) (*DumpResponse, error)
+	// DumpVars returns debug variables for the current node.
+	// To permit access, used server config options.
+	// The request should be signed.
+	DumpVars(context.Context, *DumpVarsRequest) (*DumpVarsResponse, error)
 }
 
 // UnimplementedStatusServer can be embedded to have forward compatible implementations.
@@ -480,6 +587,9 @@ func (*UnimplementedStatusServer) HealthCheck(ctx context.Context, req *HealthRe
 func (*UnimplementedStatusServer) DumpConfig(ctx context.Context, req *DumpRequest) (*DumpResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method DumpConfig not implemented")
 }
+func (*UnimplementedStatusServer) DumpVars(ctx context.Context, req *DumpVarsRequest) (*DumpVarsResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method DumpVars not implemented")
+}
 
 func RegisterStatusServer(s *grpc.Server, srv StatusServer) {
 	s.RegisterService(&_Status_serviceDesc, srv)
@@ -557,6 +667,24 @@ func _Status_DumpConfig_Handler(srv interface{}, ctx context.Context, dec func(i
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Status_DumpVars_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(DumpVarsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(StatusServer).DumpVars(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/state.Status/DumpVars",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(StatusServer).DumpVars(ctx, req.(*DumpVarsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _Status_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "state.Status",
 	HandlerType: (*StatusServer)(nil),
@@ -577,6 +705,10 @@ var _Status_serviceDesc = grpc.ServiceDesc{
 			MethodName: "DumpConfig",
 			Handler:    _Status_DumpConfig_Handler,
 		},
+		{
+			MethodName: "DumpVars",
+			Handler:    _Status_DumpVars_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "state/service.proto",
@@ -900,6 +1032,91 @@ func (m *DumpResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
+func (m *DumpVarsRequest) 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 *DumpVarsRequest) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *DumpVarsRequest) 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)
+	}
+	{
+		size, err := m.RequestVerificationHeader.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.RequestMetaHeader.MarshalToSizedBuffer(dAtA[:i])
+		if err != nil {
+			return 0, err
+		}
+		i -= size
+		i = encodeVarintService(dAtA, i, uint64(size))
+	}
+	i--
+	dAtA[i] = 0x6
+	i--
+	dAtA[i] = 0x92
+	return len(dAtA) - i, nil
+}
+
+func (m *DumpVarsResponse) 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 *DumpVarsResponse) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *DumpVarsResponse) 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 len(m.Variables) > 0 {
+		i -= len(m.Variables)
+		copy(dAtA[i:], m.Variables)
+		i = encodeVarintService(dAtA, i, uint64(len(m.Variables)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
 func encodeVarintService(dAtA []byte, offset int, v uint64) int {
 	offset -= sovService(v)
 	base := offset
@@ -1028,6 +1245,38 @@ func (m *DumpResponse) Size() (n int) {
 	return n
 }
 
+func (m *DumpVarsRequest) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = m.RequestMetaHeader.Size()
+	n += 2 + l + sovService(uint64(l))
+	l = m.RequestVerificationHeader.Size()
+	n += 2 + l + sovService(uint64(l))
+	if m.XXX_unrecognized != nil {
+		n += len(m.XXX_unrecognized)
+	}
+	return n
+}
+
+func (m *DumpVarsResponse) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Variables)
+	if l > 0 {
+		n += 1 + l + sovService(uint64(l))
+	}
+	if m.XXX_unrecognized != nil {
+		n += len(m.XXX_unrecognized)
+	}
+	return n
+}
+
 func sovService(x uint64) (n int) {
 	return (math_bits.Len64(x|1) + 6) / 7
 }
@@ -1794,6 +2043,214 @@ func (m *DumpResponse) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *DumpVarsRequest) 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 ErrIntOverflowService
+			}
+			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: DumpVarsRequest: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: DumpVarsRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 98:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field RequestMetaHeader", 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.RequestMetaHeader.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 99:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field RequestVerificationHeader", 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.RequestVerificationHeader.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipService(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthService
+			}
+			if (iNdEx + skippy) < 0 {
+				return ErrInvalidLengthService
+			}
+			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 (m *DumpVarsResponse) 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 ErrIntOverflowService
+			}
+			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: DumpVarsResponse: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: DumpVarsResponse: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Variables", wireType)
+			}
+			var byteLen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowService
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				byteLen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if byteLen < 0 {
+				return ErrInvalidLengthService
+			}
+			postIndex := iNdEx + byteLen
+			if postIndex < 0 {
+				return ErrInvalidLengthService
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Variables = append(m.Variables[:0], dAtA[iNdEx:postIndex]...)
+			if m.Variables == nil {
+				m.Variables = []byte{}
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipService(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthService
+			}
+			if (iNdEx + skippy) < 0 {
+				return ErrInvalidLengthService
+			}
+			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 skipService(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0

state/service.proto

@@ -23,6 +23,10 @@ service Status {
     // To permit access, used server config options.
     // The request should be signed.
     rpc DumpConfig(DumpRequest) returns (DumpResponse);
+    // DumpVars returns debug variables for the current node.
+    // To permit access, used server config options.
+    // The request should be signed.
+    rpc DumpVars(DumpVarsRequest) returns (DumpVarsResponse);
 }
 
 // NetmapRequest message to request current node netmap
@@ -77,3 +81,17 @@ message DumpRequest {
 message DumpResponse {
     bytes Config = 1;
 }
+
+// DumpVarsRequest message to fetch current server debug variables.
+message DumpVarsRequest {
+    // RequestMetaHeader contains information about request meta headers (should be embedded into message)
+    service.RequestMetaHeader Meta           = 98 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
+    // RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message)
+    service.RequestVerificationHeader Verify = 99 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
+}
+
+// DumpVarsResponse message contains current server debug variables.
+// Variables stored in JSON encoded into slice of bytes.
+message DumpVarsResponse {
+    bytes Variables = 1;
+}

state/service_test.go

@@ -0,0 +1,28 @@
+package state
+
+import (
+	"encoding/json"
+	"expvar"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestEncodeVariables(t *testing.T) {
+	dump := make(map[string]interface{})
+
+	expvar.NewString("test1").Set("test1")
+	expvar.NewString("test2").Set("test2")
+
+	res := EncodeVariables()
+
+	require.NoError(t, json.Unmarshal(res.Variables, &dump))
+	require.NotEmpty(t, dump)
+
+	// dump should contains keys `test1` and `test2`
+	require.Contains(t, dump, "test1")
+	require.Equal(t, "test1", dump["test1"])
+
+	require.Contains(t, dump, "test2")
+	require.Equal(t, "test2", dump["test2"])
+}