fix proto

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
2020-12-10 16:04:42 +03:00
22 changed files with 1576 additions and 573 deletions
--- a/192
+++ b/192
@@ -1,192 +0,0 @@
-
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-      the conditions stated in this License.
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-   5. Submission of Contributions. Unless You explicitly state otherwise,
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-      by You to the Licensor shall be under the terms and conditions of
-      this License, without any additional terms or conditions.
-      Notwithstanding the above, nothing herein shall supersede or modify
-      the terms of any separate license agreement you may have executed
-      with Licensor regarding such Contributions.
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-   6. Trademarks. This License does not grant permission to use the trade
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-      origin of the Work and reproducing the content of the NOTICE file.
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-      agreed to in writing, Licensor provides the Work (and each
-      Contributor provides its Contributions) on an "AS IS" BASIS,
-      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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-      PARTICULAR PURPOSE. You are solely responsible for determining the
-      appropriateness of using or redistributing the Work and assume any
-      risks associated with Your exercise of permissions under this License.
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-      whether in tort (including negligence), contract, or otherwise,
-      unless required by applicable law (such as deliberate and grossly
-      negligent acts) or agreed to in writing, shall any Contributor be
-      liable to You for damages, including any direct, indirect, special,
-      incidental, or consequential damages of any character arising as a
-      result of this License or out of the use or inability to use the
-      Work (including but not limited to damages for loss of goodwill,
-      work stoppage, computer failure or malfunction, or any and all
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-      has been advised of the possibility of such damages.
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-      the Work or Derivative Works thereof, You may choose to offer,
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-   See the License for the specific language governing permissions and
-   limitations under the License.
--- a/README.md
+++ b/README.md
@@ -0,0 +1,30 @@
+# GRPC Server
+
+The grpc server is a [micro.Server](https://godoc.org/github.com/micro/go-micro/server#Server) compatible server.
+
+## Overview
+
+The server makes use of the [google.golang.org/grpc](google.golang.org/grpc) framework for the underlying server
+but continues to use micro handler signatures and protoc-gen-micro generated code.
+
+## Usage
+
+Specify the server to your micro service
+
+```go
+import (
+        "github.com/micro/go-micro"
+        "github.com/micro/go-plugins/server/grpc"
+)
+
+func main() {
+        service := micro.NewService(
+                // This needs to be first as it replaces the underlying server
+                // which causes any configuration set before it
+                // to be discarded
+                micro.Server(grpc.NewServer()),
+                micro.Name("greeter"),
+        )
+}
+```
+**NOTE**: Setting the gRPC server and/or client causes the underlying the server/client to be replaced which causes any previous configuration set on that server/client to be discarded. It is therefore recommended to set gRPC server/client before any other configuration
--- a/codec.go
+++ b/codec.go
@@ -1,84 +1,233 @@
 package grpc

 import (
-	"io"
+	b "bytes"
+	"encoding/json"
+	"strings"

+	oldjsonpb "github.com/golang/protobuf/jsonpb"
+	oldproto "github.com/golang/protobuf/proto"
+	bytes "github.com/unistack-org/micro-codec-bytes"
 	"github.com/unistack-org/micro/v3/codec"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/encoding"
+	"google.golang.org/grpc/metadata"
+	jsonpb "google.golang.org/protobuf/encoding/protojson"
+	"google.golang.org/protobuf/proto"
 )

-type wrapStream struct{ grpc.ServerStream }
+type jsonCodec struct{}
+type bytesCodec struct{}
+type protoCodec struct{}
+type wrapCodec struct{ encoding.Codec }

-func (w *wrapStream) Write(d []byte) (int, error) {
-	n := len(d)
-	err := w.ServerStream.SendMsg(&codec.Frame{Data: d})
-	return n, err
-}
+var (
+	jsonpbMarshaler = jsonpb.MarshalOptions{
+		UseEnumNumbers:  false,
+		EmitUnpopulated: false,
+		UseProtoNames:   true,
+		AllowPartial:    false,
+	}

-func (w *wrapStream) Read(d []byte) (int, error) {
-	m := &codec.Frame{}
-	err := w.ServerStream.RecvMsg(m)
-	d = m.Data
-	return len(d), err
-}
+	jsonpbUnmarshaler = jsonpb.UnmarshalOptions{
+		DiscardUnknown: false,
+		AllowPartial:   false,
+	}

-type wrapMicroCodec struct{ codec.Codec }
+	oldjsonpbMarshaler = oldjsonpb.Marshaler{
+		OrigName:     true,
+		EmitDefaults: false,
+	}

-func (w *wrapMicroCodec) Name() string {
-	return w.Codec.String()
-}
+	oldjsonpbUnmarshaler = oldjsonpb.Unmarshaler{
+		AllowUnknownFields: false,
+	}
+)

-type wrapGrpcCodec struct{ encoding.Codec }
+var (
+	defaultGRPCCodecs = map[string]encoding.Codec{
+		"application/json":         jsonCodec{},
+		"application/proto":        protoCodec{},
+		"application/protobuf":     protoCodec{},
+		"application/octet-stream": protoCodec{},
+		"application/grpc":         protoCodec{},
+		"application/grpc+json":    jsonCodec{},
+		"application/grpc+proto":   protoCodec{},
+		"application/grpc+bytes":   bytesCodec{},
+	}
+)

-func (w *wrapGrpcCodec) String() string {
+func (w wrapCodec) String() string {
 	return w.Codec.Name()
 }

-func (w *wrapGrpcCodec) Marshal(v interface{}) ([]byte, error) {
+func (w wrapCodec) Marshal(v interface{}) ([]byte, error) {
 	switch m := v.(type) {
-	case *codec.Frame:
+	case *bytes.Frame:
 		return m.Data, nil
 	}
 	return w.Codec.Marshal(v)
 }

-func (w wrapGrpcCodec) Unmarshal(d []byte, v interface{}) error {
-	if d == nil || v == nil {
+func (w wrapCodec) Unmarshal(data []byte, v interface{}) error {
+	if len(data) == 0 {
+		return nil
+	}
+	if v == nil {
 		return nil
 	}
 	switch m := v.(type) {
-	case *codec.Frame:
-		m.Data = d
+	case *bytes.Frame:
+		m.Data = data
 		return nil
 	}
-	return w.Codec.Unmarshal(d, v)
+	return w.Codec.Unmarshal(data, v)
 }

-func (g *wrapGrpcCodec) ReadHeader(conn io.Reader, m *codec.Message, mt codec.MessageType) error {
-	return nil
-}
-
-func (g *wrapGrpcCodec) ReadBody(conn io.Reader, v interface{}) error {
-	// caller has requested a frame
+func (protoCodec) Marshal(v interface{}) ([]byte, error) {
 	switch m := v.(type) {
-	case *codec.Frame:
-		_, err := conn.Read(m.Data)
-		return err
+	case proto.Message:
+		return proto.Marshal(m)
+	case oldproto.Message:
+		return oldproto.Marshal(m)
+	}
+	return nil, codec.ErrInvalidMessage
+}
+
+func (protoCodec) Unmarshal(data []byte, v interface{}) error {
+	if len(data) == 0 {
+		return nil
+	}
+	if v == nil {
+		return nil
+	}
+	switch m := v.(type) {
+	case proto.Message:
+		return proto.Unmarshal(data, m)
+	case oldproto.Message:
+		return oldproto.Unmarshal(data, m)
 	}
 	return codec.ErrInvalidMessage
 }

-func (g *wrapGrpcCodec) Write(conn io.Writer, m *codec.Message, v interface{}) error {
+func (protoCodec) Name() string {
+	return "proto"
+}
+
+func (jsonCodec) Marshal(v interface{}) ([]byte, error) {
+	switch m := v.(type) {
+	case proto.Message:
+		return jsonpbMarshaler.Marshal(m)
+	case oldproto.Message:
+		buf := b.NewBuffer(nil)
+		err := oldjsonpbMarshaler.Marshal(buf, m)
+		return buf.Bytes(), err
+	}
+	return json.Marshal(v)
+}
+
+func (jsonCodec) Unmarshal(data []byte, v interface{}) error {
+	if len(data) == 0 {
+		return nil
+	}
+	if v == nil {
+		return nil
+	}
+	switch m := v.(type) {
+	case proto.Message:
+		return jsonpbUnmarshaler.Unmarshal(data, m)
+	case oldproto.Message:
+		return oldjsonpbUnmarshaler.Unmarshal(b.NewReader(data), m)
+	}
+	return json.Unmarshal(data, v)
+}
+
+func (jsonCodec) Name() string {
+	return "json"
+}
+
+func (bytesCodec) Marshal(v interface{}) ([]byte, error) {
+	switch m := v.(type) {
+	case *[]byte:
+		return *m, nil
+	}
+	return nil, codec.ErrInvalidMessage
+}
+
+func (bytesCodec) Unmarshal(data []byte, v interface{}) error {
+	if len(data) == 0 {
+		return nil
+	}
+	if v == nil {
+		return nil
+	}
+	switch m := v.(type) {
+	case *[]byte:
+		*m = data
+		return nil
+	}
+	return codec.ErrInvalidMessage
+}
+
+func (bytesCodec) Name() string {
+	return "bytes"
+}
+
+type grpcCodec struct {
+	grpc.ServerStream
+	// headers
+	id       string
+	target   string
+	method   string
+	endpoint string
+
+	c encoding.Codec
+}
+
+func (g *grpcCodec) ReadHeader(m *codec.Message, mt codec.MessageType) error {
+	md, _ := metadata.FromIncomingContext(g.ServerStream.Context())
+	if m == nil {
+		m = new(codec.Message)
+	}
+	if m.Header == nil {
+		m.Header = make(map[string]string, len(md))
+	}
+	for k, v := range md {
+		m.Header[k] = strings.Join(v, ",")
+	}
+	m.Id = g.id
+	m.Target = g.target
+	m.Method = g.method
+	m.Endpoint = g.endpoint
+	return nil
+}
+
+func (g *grpcCodec) ReadBody(v interface{}) error {
+	// caller has requested a frame
+	switch m := v.(type) {
+	case *bytes.Frame:
+		return g.ServerStream.RecvMsg(m)
+	}
+	return g.ServerStream.RecvMsg(v)
+}
+
+func (g *grpcCodec) Write(m *codec.Message, v interface{}) error {
 	// if we don't have a body
 	if v != nil {
-		b, err := g.Marshal(v)
+		b, err := g.c.Marshal(v)
 		if err != nil {
 			return err
 		}
 		m.Body = b
 	}
 	// write the body using the framing codec
-	_, err := conn.Write(m.Body)
-	return err
+	return g.ServerStream.SendMsg(&bytes.Frame{Data: m.Body})
+}
+
+func (g *grpcCodec) Close() error {
+	return nil
+}
+
+func (g *grpcCodec) String() string {
+	return "grpc"
 }
--- a/error.go
+++ b/error.go
@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"os"

+	pb "github.com/unistack-org/micro-server-grpc/errors"
 	"github.com/unistack-org/micro/v3/errors"
 	"google.golang.org/grpc/codes"
 )
@@ -63,6 +64,8 @@ func microError(err error) codes.Code {
 	switch verr := err.(type) {
 	case *errors.Error:
 		ec = verr.Code
+	case *pb.Error:
+		ec = verr.Code
 	}

 	if code, ok := errMapping[ec]; ok {
@@ -71,3 +74,16 @@ func microError(err error) codes.Code {

 	return codes.Unknown
 }
+
+func pbError(err error) *pb.Error {
+	switch verr := err.(type) {
+	case nil:
+		return nil
+	case *errors.Error:
+		return &pb.Error{Id: verr.Id, Code: verr.Code, Detail: verr.Detail, Status: verr.Status}
+	case *pb.Error:
+		return verr
+	default:
+		return &pb.Error{Code: 500, Detail: err.Error()}
+	}
+}
--- a/errors/errors.go
+++ b/errors/errors.go
@@ -0,0 +1,159 @@
+package errors
+
+import (
+	"fmt"
+)
+
+func (e *Error) Error() string {
+	return fmt.Sprintf(`{"id":"%s","code":%d,"detail":"%s","status":"%s"}`, e.Id, e.Code, e.Detail, e.Status)
+}
+
+// New generates a custom error.
+func New(id, detail string, code int32) error {
+	return &Error{
+		Id:     id,
+		Code:   code,
+		Detail: detail,
+		//	Status: http.StatusText(int(code)),
+	}
+}
+
+// BadRequest generates a 400 error.
+func BadRequest(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   400,
+		Detail: fmt.Sprintf(format, a...),
+		//		Status: http.StatusText(400),
+	}
+}
+
+// Unauthorized generates a 401 error.
+func Unauthorized(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   401,
+		Detail: fmt.Sprintf(format, a...),
+		//		Status: http.StatusText(401),
+	}
+}
+
+// Forbidden generates a 403 error.
+func Forbidden(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   403,
+		Detail: fmt.Sprintf(format, a...),
+		//		Status: http.StatusText(403),
+	}
+}
+
+// NotFound generates a 404 error.
+func NotFound(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   404,
+		Detail: fmt.Sprintf(format, a...),
+		//	Status: http.StatusText(404),
+	}
+}
+
+// MethodNotAllowed generates a 405 error.
+func MethodNotAllowed(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   405,
+		Detail: fmt.Sprintf(format, a...),
+		//Status: http.StatusText(405),
+	}
+}
+
+// Timeout generates a 408 error.
+func Timeout(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   408,
+		Detail: fmt.Sprintf(format, a...),
+		//Status: http.StatusText(408),
+	}
+}
+
+// Conflict generates a 409 error.
+func Conflict(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   409,
+		Detail: fmt.Sprintf(format, a...),
+		//Status: http.StatusText(409),
+	}
+}
+
+// InternalServerError generates a 500 error.
+func InternalServerError(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   500,
+		Detail: fmt.Sprintf(format, a...),
+		//Status: http.StatusText(500),
+	}
+}
+
+// NotImplemented generates a 501 error
+func NotImplemented(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   501,
+		Detail: fmt.Sprintf(format, a...),
+		//Status: http.StatusText(501),
+	}
+}
+
+// BadGateway generates a 502 error
+func BadGateway(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   502,
+		Detail: fmt.Sprintf(format, a...),
+		//	Status: http.StatusText(502),
+	}
+}
+
+// ServiceUnavailable generates a 503 error
+func ServiceUnavailable(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   503,
+		Detail: fmt.Sprintf(format, a...),
+		//Status: http.StatusText(503),
+	}
+}
+
+// GatewayTimeout generates a 504 error
+func GatewayTimeout(id, format string, a ...interface{}) error {
+	return &Error{
+		Id:     id,
+		Code:   504,
+		Detail: fmt.Sprintf(format, a...),
+		//Status: http.StatusText(504),
+	}
+}
+
+// Equal tries to compare errors
+func Equal(err1 error, err2 error) bool {
+	verr1, ok1 := err1.(*Error)
+	verr2, ok2 := err2.(*Error)
+
+	if ok1 != ok2 {
+		return false
+	}
+
+	if !ok1 {
+		return err1 == err2
+	}
+
+	if verr1.Code != verr2.Code {
+		return false
+	}
+
+	return true
+}
--- a/errors/errors.pb.go
+++ b/errors/errors.pb.go
@@ -0,0 +1,173 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.25.0-devel
+// 	protoc        v3.6.1
+// source: errors.proto
+
+package errors
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+type Error struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Id     string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Code   int32  `protobuf:"varint,2,opt,name=code,proto3" json:"code,omitempty"`
+	Detail string `protobuf:"bytes,3,opt,name=detail,proto3" json:"detail,omitempty"`
+	Status string `protobuf:"bytes,4,opt,name=status,proto3" json:"status,omitempty"`
+}
+
+func (x *Error) Reset() {
+	*x = Error{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_errors_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Error) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Error) ProtoMessage() {}
+
+func (x *Error) ProtoReflect() protoreflect.Message {
+	mi := &file_errors_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Error.ProtoReflect.Descriptor instead.
+func (*Error) Descriptor() ([]byte, []int) {
+	return file_errors_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Error) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *Error) GetCode() int32 {
+	if x != nil {
+		return x.Code
+	}
+	return 0
+}
+
+func (x *Error) GetDetail() string {
+	if x != nil {
+		return x.Detail
+	}
+	return ""
+}
+
+func (x *Error) GetStatus() string {
+	if x != nil {
+		return x.Status
+	}
+	return ""
+}
+
+var File_errors_proto protoreflect.FileDescriptor
+
+var file_errors_proto_rawDesc = []byte{
+	0x0a, 0x0c, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x06,
+	0x65, 0x72, 0x72, 0x6f, 0x72, 0x73, 0x22, 0x5b, 0x0a, 0x05, 0x45, 0x72, 0x72, 0x6f, 0x72, 0x12,
+	0x0e, 0x0a, 0x02, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x02, 0x69, 0x64, 0x12,
+	0x12, 0x0a, 0x04, 0x63, 0x6f, 0x64, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x05, 0x52, 0x04, 0x63,
+	0x6f, 0x64, 0x65, 0x12, 0x16, 0x0a, 0x06, 0x64, 0x65, 0x74, 0x61, 0x69, 0x6c, 0x18, 0x03, 0x20,
+	0x01, 0x28, 0x09, 0x52, 0x06, 0x64, 0x65, 0x74, 0x61, 0x69, 0x6c, 0x12, 0x16, 0x0a, 0x06, 0x73,
+	0x74, 0x61, 0x74, 0x75, 0x73, 0x18, 0x04, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06, 0x73, 0x74, 0x61,
+	0x74, 0x75, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_errors_proto_rawDescOnce sync.Once
+	file_errors_proto_rawDescData = file_errors_proto_rawDesc
+)
+
+func file_errors_proto_rawDescGZIP() []byte {
+	file_errors_proto_rawDescOnce.Do(func() {
+		file_errors_proto_rawDescData = protoimpl.X.CompressGZIP(file_errors_proto_rawDescData)
+	})
+	return file_errors_proto_rawDescData
+}
+
+var file_errors_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_errors_proto_goTypes = []interface{}{
+	(*Error)(nil), // 0: errors.Error
+}
+var file_errors_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_errors_proto_init() }
+func file_errors_proto_init() {
+	if File_errors_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_errors_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Error); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_errors_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_errors_proto_goTypes,
+		DependencyIndexes: file_errors_proto_depIdxs,
+		MessageInfos:      file_errors_proto_msgTypes,
+	}.Build()
+	File_errors_proto = out.File
+	file_errors_proto_rawDesc = nil
+	file_errors_proto_goTypes = nil
+	file_errors_proto_depIdxs = nil
+}
--- a/errors/errors.pb.micro.go
+++ b/errors/errors.pb.micro.go
@@ -0,0 +1,21 @@
+// Code generated by protoc-gen-micro. DO NOT EDIT.
+// source: errors.proto
+
+package errors
+
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
--- a/errors/errors.proto
+++ b/errors/errors.proto
@@ -0,0 +1,10 @@
+syntax = "proto3";
+
+package errors;
+
+message Error {
+  string id = 1;
+  int32 code = 2;
+  string detail = 3;
+  string status = 4;
+};
--- a/extractor.go
+++ b/extractor.go
@@ -0,0 +1,122 @@
+package grpc
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+
+	"github.com/unistack-org/micro/v3/registry"
+)
+
+func extractValue(v reflect.Type, d int) *registry.Value {
+	if d == 3 {
+		return nil
+	}
+	if v == nil {
+		return nil
+	}
+
+	if v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+
+	arg := &registry.Value{
+		Name: v.Name(),
+		Type: v.Name(),
+	}
+
+	switch v.Kind() {
+	case reflect.Struct:
+		for i := 0; i < v.NumField(); i++ {
+			f := v.Field(i)
+			val := extractValue(f.Type, d+1)
+			if val == nil {
+				continue
+			}
+
+			// if we can find a json tag use it
+			if tags := f.Tag.Get("json"); len(tags) > 0 {
+				parts := strings.Split(tags, ",")
+				if parts[0] == "-" || parts[0] == "omitempty" {
+					continue
+				}
+				val.Name = parts[0]
+			}
+
+			// if there's no name default it
+			if len(val.Name) == 0 {
+				val.Name = v.Field(i).Name
+			}
+
+			arg.Values = append(arg.Values, val)
+		}
+	case reflect.Slice:
+		p := v.Elem()
+		if p.Kind() == reflect.Ptr {
+			p = p.Elem()
+		}
+		arg.Type = "[]" + p.Name()
+	}
+
+	return arg
+}
+
+func extractEndpoint(method reflect.Method) *registry.Endpoint {
+	if method.PkgPath != "" {
+		return nil
+	}
+
+	var rspType, reqType reflect.Type
+	var stream bool
+	mt := method.Type
+
+	switch mt.NumIn() {
+	case 3:
+		reqType = mt.In(1)
+		rspType = mt.In(2)
+	case 4:
+		reqType = mt.In(2)
+		rspType = mt.In(3)
+	default:
+		return nil
+	}
+
+	// are we dealing with a stream?
+	switch rspType.Kind() {
+	case reflect.Func, reflect.Interface:
+		stream = true
+	}
+
+	request := extractValue(reqType, 0)
+	response := extractValue(rspType, 0)
+
+	ep := &registry.Endpoint{
+		Name:     method.Name,
+		Request:  request,
+		Response: response,
+		Metadata: make(map[string]string),
+	}
+
+	if stream {
+		ep.Metadata = map[string]string{
+			"stream": fmt.Sprintf("%v", stream),
+		}
+	}
+
+	return ep
+}
+
+func extractSubValue(typ reflect.Type) *registry.Value {
+	var reqType reflect.Type
+	switch typ.NumIn() {
+	case 1:
+		reqType = typ.In(0)
+	case 2:
+		reqType = typ.In(1)
+	case 3:
+		reqType = typ.In(2)
+	default:
+		return nil
+	}
+	return extractValue(reqType, 0)
+}
--- a/extractor_test.go
+++ b/extractor_test.go
@@ -0,0 +1,65 @@
+package grpc
+
+import (
+	"context"
+	"reflect"
+	"testing"
+
+	"github.com/unistack-org/micro/v3/registry"
+)
+
+type testHandler struct{}
+
+type testRequest struct{}
+
+type testResponse struct{}
+
+func (t *testHandler) Test(ctx context.Context, req *testRequest, rsp *testResponse) error {
+	return nil
+}
+
+func TestExtractEndpoint(t *testing.T) {
+	handler := &testHandler{}
+	typ := reflect.TypeOf(handler)
+
+	var endpoints []*registry.Endpoint
+
+	for m := 0; m < typ.NumMethod(); m++ {
+		if e := extractEndpoint(typ.Method(m)); e != nil {
+			endpoints = append(endpoints, e)
+		}
+	}
+
+	if i := len(endpoints); i != 1 {
+		t.Errorf("Expected 1 endpoint, have %d", i)
+	}
+
+	if endpoints[0].Name != "Test" {
+		t.Errorf("Expected handler Test, got %s", endpoints[0].Name)
+	}
+
+	if endpoints[0].Request == nil {
+		t.Error("Expected non nil request")
+	}
+
+	if endpoints[0].Response == nil {
+		t.Error("Expected non nil request")
+	}
+
+	if endpoints[0].Request.Name != "testRequest" {
+		t.Errorf("Expected testRequest got %s", endpoints[0].Request.Name)
+	}
+
+	if endpoints[0].Response.Name != "testResponse" {
+		t.Errorf("Expected testResponse got %s", endpoints[0].Response.Name)
+	}
+
+	if endpoints[0].Request.Type != "testRequest" {
+		t.Errorf("Expected testRequest type got %s", endpoints[0].Request.Type)
+	}
+
+	if endpoints[0].Response.Type != "testResponse" {
+		t.Errorf("Expected testResponse type got %s", endpoints[0].Response.Type)
+	}
+
+}
--- a/generate.go
+++ b/generate.go
@@ -0,0 +1,3 @@
+package grpc
+
+//go:generate protoc -I./errors -I. --go-grpc_out=paths=source_relative:./errors --go_out=paths=source_relative:./errors --micro_out=paths=source_relative:./errors errors/errors.proto
--- a/go.mod
+++ b/go.mod
@@ -1,16 +1,16 @@
-module github.com/unistack-org/micro-server-grpc/v3
+module github.com/unistack-org/micro-server-grpc

 go 1.15

 require (
-	github.com/golang/protobuf v1.4.3
+	github.com/golang/protobuf v1.4.2
 	github.com/google/go-cmp v0.5.1 // indirect
-	github.com/unistack-org/micro/v3 v3.2.2
-	golang.org/x/net v0.0.0-20201224014010-6772e930b67b
+	github.com/unistack-org/micro-codec-bytes v0.0.0-20200828083432-4e49e953d844
+	github.com/unistack-org/micro/v3 v3.0.0-gamma.0.20200920124807-9b11ea527aeb
+	golang.org/x/net v0.0.0-20200904194848-62affa334b73
+	golang.org/x/sys v0.0.0-20200803210538-64077c9b5642 // indirect
+	golang.org/x/text v0.3.3 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
-	google.golang.org/genproto v0.0.0-20200904004341-0bd0a958aa1d // indirect
-	google.golang.org/grpc v1.35.0
+	google.golang.org/grpc v1.31.1
 	google.golang.org/protobuf v1.25.0
 )
-
-//replace github.com/unistack-org/micro/v3 => ../../micro
--- a/go.sum
+++ b/go.sum
@@ -1,32 +1,117 @@
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 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/api v0.3.1/go.mod h1:6wY9I6uQWHQ8EM57III9mq/AjF+i8G65rmVagqKMtkk=
+google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
+google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
+google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
+google.golang.org/api v0.9.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
+google.golang.org/api v0.14.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
-google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 h1:+kGHl1aib/qcwaRi1CbqBZ1rk19r85MNUf8HaBghugY=
+google.golang.org/genproto v0.0.0-20190911173649-1774047e7e51/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
+google.golang.org/genproto v0.0.0-20191216164720-4f79533eabd1/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
 google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
 google.golang.org/genproto v0.0.0-20200904004341-0bd0a958aa1d h1:92D1fum1bJLKSdr11OJ+54YeCMCGYIygTA7R/YZxH5M=
 google.golang.org/genproto v0.0.0-20200904004341-0bd0a958aa1d/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
+google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.19.1/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.35.0 h1:TwIQcH3es+MojMVojxxfQ3l3OF2KzlRxML2xZq0kRo8=
-google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
+google.golang.org/grpc v1.31.1 h1:SfXqXS5hkufcdZ/mHtYCh53P2b+92WQq/DZcKLgsFRs=
+google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -132,14 +439,33 @@ google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpAD
 google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/h2non/gock.v1 v1.0.15/go.mod h1:sX4zAkdYX1TRGJ2JY156cFspQn4yRWn6p9EMdODlynE=
+gopkg.in/ini.v1 v1.42.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ini.v1 v1.44.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ns1/ns1-go.v2 v2.0.0-20190730140822-b51389932cbc/go.mod h1:VV+3haRsgDiVLxyifmMBrBIuCWFBPYKbRssXB9z67Hw=
+gopkg.in/resty.v1 v1.9.1/go.mod h1:vo52Hzryw9PnPHcJfPsBiFW62XhNx5OczbV9y+IMpgc=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
+gopkg.in/square/go-jose.v2 v2.4.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
--- a/grpc.go
+++ b/grpc.go
@@ -15,13 +15,17 @@ import (
 	"time"

 	oldproto "github.com/golang/protobuf/proto"
+	pberr "github.com/unistack-org/micro-server-grpc/errors"
 	"github.com/unistack-org/micro/v3/broker"
-	"github.com/unistack-org/micro/v3/codec"
 	"github.com/unistack-org/micro/v3/errors"
 	"github.com/unistack-org/micro/v3/logger"
 	meta "github.com/unistack-org/micro/v3/metadata"
-	"github.com/unistack-org/micro/v3/register"
+	"github.com/unistack-org/micro/v3/registry"
 	"github.com/unistack-org/micro/v3/server"
+	"github.com/unistack-org/micro/v3/util/addr"
+	"github.com/unistack-org/micro/v3/util/backoff"
+	mgrpc "github.com/unistack-org/micro/v3/util/grpc"
+	mnet "github.com/unistack-org/micro/v3/util/net"
 	"golang.org/x/net/netutil"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
@@ -34,6 +38,12 @@ import (
 	"google.golang.org/protobuf/proto"
 )

+var (
+	// DefaultMaxMsgSize define maximum message size that server can send
+	// or receive.  Default value is 4MB.
+	DefaultMaxMsgSize = 1024 * 1024 * 4
+)
+
 const (
 	defaultContentType = "application/grpc"
 )
@@ -59,16 +69,22 @@ type grpcServer struct {
 	registered bool

 	reflection bool
-	// register service instance
-	rsvc *register.Service
+	// registry service instance
+	rsvc *registry.Service

-	codecs map[string]codec.Codec
+	codecs map[string]encoding.Codec
+}
+
+func init() {
+	encoding.RegisterCodec(wrapCodec{jsonCodec{}})
+	encoding.RegisterCodec(wrapCodec{protoCodec{}})
+	encoding.RegisterCodec(wrapCodec{bytesCodec{}})
 }

 func newGRPCServer(opts ...server.Option) server.Server {
 	// create a grpc server
 	g := &grpcServer{
-		opts: server.NewOptions(opts...),
+		opts: server.NewOptions(),
 		rpc: &rServer{
 			serviceMap: make(map[string]*service),
 		},
@@ -77,6 +93,10 @@ func newGRPCServer(opts ...server.Option) server.Server {
 		exit:        make(chan chan error),
 	}

+	for _, o := range opts {
+		o(&g.opts)
+	}
+
 	return g
 }

@@ -97,12 +117,17 @@ func (g *grpcServer) configure(opts ...server.Option) error {
 	g.Lock()
 	defer g.Unlock()

+	// Don't reprocess if server created
+	if g.srv != nil {
+		return nil
+	}
+
 	for _, o := range opts {
 		o(&g.opts)
 	}

-	if g.opts.Register == nil {
-		return fmt.Errorf("register not set")
+	if g.opts.Registry == nil {
+		return fmt.Errorf("registry not set")
 	}

 	if g.opts.Broker == nil {
@@ -111,14 +136,22 @@ func (g *grpcServer) configure(opts ...server.Option) error {

 	g.wg = g.opts.Wait

+	g.codecs = make(map[string]encoding.Codec, len(defaultGRPCCodecs))
+	for k, v := range defaultGRPCCodecs {
+		g.codecs[k] = v
+	}
+
+	var codecs map[string]encoding.Codec
 	if g.opts.Context != nil {
-		if codecs, ok := g.opts.Context.Value(codecsKey{}).(map[string]encoding.Codec); ok && codecs != nil {
-			for k, v := range codecs {
-				g.opts.Codecs[k] = &wrapGrpcCodec{v}
-			}
+		if v, ok := g.opts.Context.Value(codecsKey{}).(map[string]encoding.Codec); ok && v != nil {
+			codecs = v
 		}
 	}

+	for k, v := range codecs {
+		g.codecs[k] = v
+	}
+
 	maxMsgSize := g.getMaxMsgSize()

 	gopts := []grpc.ServerOption{
@@ -136,33 +169,22 @@ func (g *grpcServer) configure(opts ...server.Option) error {
 	}

 	g.rsvc = nil
-	restart := false
-	if g.started {
-		restart = true
-		if err := g.Stop(); err != nil {
-			return err
-		}
-	}
 	g.srv = grpc.NewServer(gopts...)

 	if v, ok := g.opts.Context.Value(reflectionKey{}).(bool); ok {
 		g.reflection = v
 	}

-	if restart {
-		return g.Start()
-	}
-
 	return nil
 }

 func (g *grpcServer) getMaxMsgSize() int {
 	if g.opts.Context == nil {
-		return codec.DefaultMaxMsgSize
+		return DefaultMaxMsgSize
 	}
 	s, ok := g.opts.Context.Value(maxMsgSizeKey{}).(int)
 	if !ok {
-		return codec.DefaultMaxMsgSize
+		return DefaultMaxMsgSize
 	}
 	return s
 }
@@ -189,23 +211,29 @@ func (g *grpcServer) getGrpcOptions() []grpc.ServerOption {
 	return opts
 }

+func (g *grpcServer) getListener() net.Listener {
+	if g.opts.Context == nil {
+		return nil
+	}
+
+	if l, ok := g.opts.Context.Value(netListener{}).(net.Listener); ok && l != nil {
+		return l
+	}
+
+	return nil
+}
+
 func (g *grpcServer) handler(srv interface{}, stream grpc.ServerStream) (err error) {
 	defer func() {
 		if r := recover(); r != nil {
-			g.RLock()
-			config := g.opts
-			g.RUnlock()
-			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Error(config.Context, "panic recovered: ", r)
-				config.Logger.Error(config.Context, string(debug.Stack()))
+			if logger.V(logger.ErrorLevel) {
+				logger.Error("panic recovered: ", r)
+				logger.Error(string(debug.Stack()))
 			}
 			err = errors.InternalServerError(g.opts.Name, "panic recovered: %v", r)
 		} else if err != nil {
-			g.RLock()
-			config := g.opts
-			g.RUnlock()
-			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(config.Context, "grpc handler got error: %s", err)
+			if logger.V(logger.ErrorLevel) {
+				logger.Errorf("grpc handler got error: %s", err)
 			}
 		}
 	}()
@@ -220,7 +248,7 @@ func (g *grpcServer) handler(srv interface{}, stream grpc.ServerStream) (err err
 		return status.Errorf(codes.Internal, "method does not exist in context")
 	}

-	serviceName, methodName, err := serviceMethod(fullMethod)
+	serviceName, methodName, err := mgrpc.ServiceMethod(fullMethod)
 	if err != nil {
 		return status.New(codes.InvalidArgument, err.Error()).Err()
 	}
@@ -273,30 +301,30 @@ func (g *grpcServer) handler(srv interface{}, stream grpc.ServerStream) (err err

 	// process via router
 	if g.opts.Router != nil {
-		cf, err := g.newCodec(ct)
+		cc, err := g.newGRPCCodec(ct)
 		if err != nil {
 			return errors.InternalServerError(g.opts.Name, err.Error())
 		}
+		codec := &grpcCodec{
+			ServerStream: stream,
+			method:       fmt.Sprintf("%s.%s", serviceName, methodName),
+			endpoint:     fmt.Sprintf("%s.%s", serviceName, methodName),
+			target:       g.opts.Name,
+			c:            cc,
+		}

 		// create a client.Request
 		request := &rpcRequest{
-			rw:          &wrapStream{stream},
-			service:     serviceFromMethod(fullMethod),
+			service:     mgrpc.ServiceFromMethod(fullMethod),
 			contentType: ct,
 			method:      fmt.Sprintf("%s.%s", serviceName, methodName),
-			endpoint:    fmt.Sprintf("%s.%s", serviceName, methodName),
-			target:      g.opts.Name,
-			codec:       cf,
+			codec:       codec,
 			stream:      true,
 		}

 		response := &rpcResponse{
-			method:   fmt.Sprintf("%s.%s", serviceName, methodName),
-			endpoint: fmt.Sprintf("%s.%s", serviceName, methodName),
-			target:   g.opts.Name,
-			rw:       &wrapStream{stream},
-			header:   make(map[string]string),
-			codec:    cf,
+			header: make(map[string]string),
+			codec:  codec,
 		}

 		// create a wrapped function
@@ -337,12 +365,7 @@ func (g *grpcServer) handler(srv interface{}, stream grpc.ServerStream) (err err
 		typ := reflect.TypeOf(rfl)
 		if me, ok := typ.MethodByName("ServerReflectionInfo"); ok {
 			g.rpc.mu.Lock()
-			ep, err := prepareEndpoint(me)
-			if ep != nil && err != nil {
-				svc.method["ServerReflectionInfo"] = ep
-			} else if err != nil {
-				return status.New(codes.Unimplemented, err.Error()).Err()
-			}
+			svc.method["ServerReflectionInfo"] = prepareEndpoint(me)
 			g.rpc.mu.Unlock()
 		}
 	}
@@ -393,11 +416,11 @@ func (g *grpcServer) processRequest(stream grpc.ServerStream, service *service,
 		function := mtype.method.Func
 		var returnValues []reflect.Value

-		cf, err := g.newCodec(ct)
+		cc, err := g.newGRPCCodec(ct)
 		if err != nil {
 			return errors.InternalServerError(g.opts.Name, err.Error())
 		}
-		b, err := cf.Marshal(argv.Interface())
+		b, err := cc.Marshal(argv.Interface())
 		if err != nil {
 			return err
 		}
@@ -433,10 +456,22 @@ func (g *grpcServer) processRequest(stream grpc.ServerStream, service *service,
 		if appErr := fn(ctx, r, replyv.Interface()); appErr != nil {
 			var errStatus *status.Status
 			switch verr := appErr.(type) {
-			case *errors.Error:
+			case *pberr.Error:
+				perr := pbError(verr)
 				statusCode = microError(verr)
 				statusDesc = verr.Error()
-				errStatus = status.New(statusCode, statusDesc)
+				errStatus, err = status.New(statusCode, statusDesc).WithDetails(perr)
+				if err != nil {
+					return err
+				}
+			case *errors.Error:
+				perr := pbError(verr)
+				statusCode = microError(verr)
+				statusDesc = verr.Error()
+				errStatus, err = status.New(statusCode, statusDesc).WithDetails(perr)
+				if err != nil {
+					return err
+				}
 			case oldproto.Message:
 				// user defined error that proto based we can attach it to grpc status
 				statusCode = convertCode(appErr)
@@ -454,12 +489,6 @@ func (g *grpcServer) processRequest(stream grpc.ServerStream, service *service,
 					return err
 				}
 			default:
-				g.RLock()
-				config := g.opts
-				g.RUnlock()
-				if config.Logger.V(logger.ErrorLevel) {
-					config.Logger.Warn(config.Context, "handler error will not be transferred properly, must return *errors.Error or proto.Message")
-				}
 				// default case user pass own error type that not proto based
 				statusCode = convertCode(verr)
 				statusDesc = verr.Error()
@@ -558,10 +587,22 @@ func (g *grpcServer) processStream(stream grpc.ServerStream, service *service, m
 		var err error
 		var errStatus *status.Status
 		switch verr := appErr.(type) {
-		case *errors.Error:
+		case *pberr.Error:
+			perr := pbError(verr)
 			statusCode = microError(verr)
 			statusDesc = verr.Error()
-			errStatus = status.New(statusCode, statusDesc)
+			errStatus, err = status.New(statusCode, statusDesc).WithDetails(perr)
+			if err != nil {
+				return err
+			}
+		case *errors.Error:
+			perr := pbError(verr)
+			statusCode = microError(verr)
+			statusDesc = verr.Error()
+			errStatus, err = status.New(statusCode, statusDesc).WithDetails(perr)
+			if err != nil {
+				return err
+			}
 		case oldproto.Message:
 			// user defined error that proto based we can attach it to grpc status
 			statusCode = convertCode(appErr)
@@ -579,9 +620,6 @@ func (g *grpcServer) processStream(stream grpc.ServerStream, service *service, m
 				return err
 			}
 		default:
-			if g.opts.Logger.V(logger.ErrorLevel) {
-				g.opts.Logger.Error(g.opts.Context, "handler error will not be transferred properly, must return *errors.Error or proto.Message")
-			}
 			// default case user pass own error type that not proto based
 			statusCode = convertCode(verr)
 			statusDesc = verr.Error()
@@ -594,15 +632,15 @@ func (g *grpcServer) processStream(stream grpc.ServerStream, service *service, m
 	return status.New(statusCode, statusDesc).Err()
 }

-func (g *grpcServer) newCodec(ct string) (codec.Codec, error) {
+func (g *grpcServer) newGRPCCodec(contentType string) (encoding.Codec, error) {
 	g.RLock()
 	defer g.RUnlock()

-	if c, ok := g.opts.Codecs[ct]; ok {
+	if c, ok := g.codecs[contentType]; ok {
 		return c, nil
 	}

-	return nil, codec.ErrUnknownContentType
+	return nil, fmt.Errorf("Unsupported Content-Type: %s", contentType)
 }

 func (g *grpcServer) Options() server.Options {
@@ -643,7 +681,7 @@ func (g *grpcServer) Subscribe(sb server.Subscriber) error {
 		return fmt.Errorf("invalid subscriber: no handler functions")
 	}

-	if err := server.ValidateSubscriber(sb); err != nil {
+	if err := validateSubscriber(sb); err != nil {
 		return err
 	}

@@ -664,19 +702,85 @@ func (g *grpcServer) Register() error {
 	config := g.opts
 	g.RUnlock()

+	regFunc := func(service *registry.Service) error {
+		var regErr error
+
+		for i := 0; i < 3; i++ {
+			// set the ttl and namespace
+			rOpts := []registry.RegisterOption{
+				registry.RegisterTTL(config.RegisterTTL),
+				registry.RegisterDomain(g.opts.Namespace),
+			}
+
+			// attempt to register
+			if err := config.Registry.Register(service, rOpts...); err != nil {
+				// set the error
+				regErr = err
+				// backoff then retry
+				time.Sleep(backoff.Do(i + 1))
+				continue
+			}
+			// success so nil error
+			regErr = nil
+			break
+		}
+
+		return regErr
+	}
+
 	// if service already filled, reuse it and return early
 	if rsvc != nil {
-		if err := server.DefaultRegisterFunc(rsvc, config); err != nil {
+		if err := regFunc(rsvc); err != nil {
 			return err
 		}
 		return nil
 	}

-	service, err := server.NewRegisterService(g)
+	var err error
+	var advt, host, port string
+	var cacheService bool
+
+	advt = config.Advertise
+
+	if cnt := strings.Count(advt, ":"); cnt >= 1 {
+		// ipv6 address in format [host]:port or ipv4 host:port
+		host, port, err = net.SplitHostPort(advt)
+		if err != nil {
+			return err
+		}
+	} else {
+		host = advt
+	}
+
+	if ip := net.ParseIP(host); ip != nil {
+		cacheService = true
+	}
+
+	addr, err := addr.Extract(host)
 	if err != nil {
 		return err
 	}

+	// make copy of metadata
+	md := meta.Copy(config.Metadata)
+
+	// register service
+	node := &registry.Node{
+		Id:       config.Name + "-" + config.Id,
+		Address:  mnet.HostPort(addr, port),
+		Metadata: md,
+	}
+
+	if node.Metadata == nil {
+		node.Metadata = make(map[string]string, 5)
+	}
+
+	node.Metadata["broker"] = config.Broker.String()
+	node.Metadata["registry"] = config.Registry.String()
+	node.Metadata["server"] = g.String()
+	node.Metadata["transport"] = g.String()
+	node.Metadata["protocol"] = "grpc"
+
 	g.RLock()
 	// Maps are ordered randomly, sort the keys for consistency
 	var handlerList []string
@@ -700,7 +804,7 @@ func (g *grpcServer) Register() error {
 		return subscriberList[i].topic > subscriberList[j].topic
 	})

-	endpoints := make([]*register.Endpoint, 0, len(handlerList)+len(subscriberList))
+	endpoints := make([]*registry.Endpoint, 0, len(handlerList)+len(subscriberList))
 	for _, n := range handlerList {
 		endpoints = append(endpoints, g.handlers[n].Endpoints()...)
 	}
@@ -709,22 +813,25 @@ func (g *grpcServer) Register() error {
 	}
 	g.RUnlock()

-	service.Nodes[0].Metadata["protocol"] = "grpc"
-	service.Nodes[0].Metadata["transport"] = "grpc"
-	service.Endpoints = endpoints
+	service := &registry.Service{
+		Name:      config.Name,
+		Version:   config.Version,
+		Nodes:     []*registry.Node{node},
+		Endpoints: endpoints,
+	}

 	g.RLock()
 	registered := g.registered
 	g.RUnlock()

 	if !registered {
-		if config.Logger.V(logger.InfoLevel) {
-			config.Logger.Infof(config.Context, "Register [%s] Registering node: %s", config.Register.String(), service.Nodes[0].Id)
+		if logger.V(logger.InfoLevel) {
+			logger.Infof("Registry [%s] Registering node: %s", config.Registry.String(), node.Id)
 		}
 	}

 	// register the service
-	if err := server.DefaultRegisterFunc(service, config); err != nil {
+	if err := regFunc(service); err != nil {
 		return err
 	}

@@ -737,23 +844,22 @@ func (g *grpcServer) Register() error {
 	defer g.Unlock()

 	for sb := range g.subscribers {
-		handler := g.createSubHandler(sb, config)
+		handler := g.createSubHandler(sb, g.opts)
 		var opts []broker.SubscribeOption
 		if queue := sb.Options().Queue; len(queue) > 0 {
 			opts = append(opts, broker.SubscribeGroup(queue))
 		}

-		subCtx := config.Context
 		if cx := sb.Options().Context; cx != nil {
-			subCtx = cx
+			opts = append(opts, broker.SubscribeContext(cx))
 		}
-		opts = append(opts, broker.SubscribeContext(subCtx))
+
 		opts = append(opts, broker.SubscribeAutoAck(sb.Options().AutoAck))

-		if config.Logger.V(logger.InfoLevel) {
-			config.Logger.Infof(config.Context, "Subscribing to topic: %s", sb.Topic())
+		if logger.V(logger.InfoLevel) {
+			logger.Infof("Subscribing to topic: %s", sb.Topic())
 		}
-		sub, err := config.Broker.Subscribe(subCtx, sb.Topic(), handler, opts...)
+		sub, err := config.Broker.Subscribe(sb.Topic(), handler, opts...)
 		if err != nil {
 			return err
 		}
@@ -761,28 +867,62 @@ func (g *grpcServer) Register() error {
 	}

 	g.registered = true
-	g.rsvc = service
+	if cacheService {
+		g.rsvc = service
+	}

 	return nil
 }

 func (g *grpcServer) Deregister() error {
 	var err error
+	var advt, host, port string

 	g.RLock()
 	config := g.opts
 	g.RUnlock()

-	service, err := server.NewRegisterService(g)
+	// check the advertise address first
+	// if it exists then use it, otherwise
+	// use the address
+	if len(config.Advertise) > 0 {
+		advt = config.Advertise
+	} else {
+		advt = config.Address
+	}
+
+	if cnt := strings.Count(advt, ":"); cnt >= 1 {
+		// ipv6 address in format [host]:port or ipv4 host:port
+		host, port, err = net.SplitHostPort(advt)
+		if err != nil {
+			return err
+		}
+	} else {
+		host = advt
+	}
+
+	addr, err := addr.Extract(host)
 	if err != nil {
 		return err
 	}

-	if config.Logger.V(logger.InfoLevel) {
-		config.Logger.Infof(config.Context, "Deregistering node: %s", service.Nodes[0].Id)
+	node := &registry.Node{
+		Id:      config.Name + "-" + config.Id,
+		Address: mnet.HostPort(addr, port),
 	}

-	if err := server.DefaultDeregisterFunc(service, config); err != nil {
+	service := &registry.Service{
+		Name:    config.Name,
+		Version: config.Version,
+		Nodes:   []*registry.Node{node},
+	}
+
+	if logger.V(logger.InfoLevel) {
+		logger.Infof("Deregistering node: %s", node.Id)
+	}
+
+	opt := registry.DeregisterDomain(g.opts.Namespace)
+	if err := config.Registry.Deregister(service, opt); err != nil {
 		return err
 	}

@@ -802,12 +942,12 @@ func (g *grpcServer) Deregister() error {
 			wg.Add(1)
 			go func(s broker.Subscriber) {
 				defer wg.Done()
-				if config.Logger.V(logger.InfoLevel) {
-					config.Logger.Infof(config.Context, "Unsubscribing from topic: %s", s.Topic())
+				if logger.V(logger.InfoLevel) {
+					logger.Infof("Unsubscribing from topic: %s", s.Topic())
 				}
-				if err := s.Unsubscribe(g.opts.Context); err != nil {
-					if config.Logger.V(logger.ErrorLevel) {
-						config.Logger.Errorf(config.Context, "Unsubscribing from topic: %s err: %v", s.Topic(), err)
+				if err := s.Unsubscribe(); err != nil {
+					if logger.V(logger.ErrorLevel) {
+						logger.Errorf("Unsubscribing from topic: %s err: %v", s.Topic(), err)
 					}
 				}
 			}(sub)
@@ -830,14 +970,10 @@ func (g *grpcServer) Start() error {

 	config := g.Options()

-	for _, k := range config.Codecs {
-		encoding.RegisterCodec(&wrapMicroCodec{k})
-	}
-
 	// micro: config.Transport.Listen(config.Address)
 	var ts net.Listener

-	if l := config.Listener; l != nil {
+	if l := g.getListener(); l != nil {
 		ts = l
 	} else {
 		var err error
@@ -854,12 +990,14 @@ func (g *grpcServer) Start() error {
 		}
 	}

-	if config.MaxConn > 0 {
-		ts = netutil.LimitListener(ts, config.MaxConn)
+	if g.opts.Context != nil {
+		if c, ok := g.opts.Context.Value(maxConnKey{}).(int); ok && c > 0 {
+			ts = netutil.LimitListener(ts, c)
+		}
 	}

-	if config.Logger.V(logger.InfoLevel) {
-		config.Logger.Infof(config.Context, "Server [grpc] Listening on %s", ts.Addr().String())
+	if logger.V(logger.InfoLevel) {
+		logger.Infof("Server [grpc] Listening on %s", ts.Addr().String())
 	}
 	g.Lock()
 	g.opts.Address = ts.Addr().String()
@@ -871,28 +1009,28 @@ func (g *grpcServer) Start() error {
 	// only connect if we're subscribed
 	if len(g.subscribers) > 0 {
 		// connect to the broker
-		if err := config.Broker.Connect(config.Context); err != nil {
-			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(config.Context, "Broker [%s] connect error: %v", config.Broker.String(), err)
+		if err := config.Broker.Connect(); err != nil {
+			if logger.V(logger.ErrorLevel) {
+				logger.Errorf("Broker [%s] connect error: %v", config.Broker.String(), err)
 			}
 			return err
 		}

-		if config.Logger.V(logger.InfoLevel) {
-			config.Logger.Infof(config.Context, "Broker [%s] Connected to %s", config.Broker.String(), config.Broker.Address())
+		if logger.V(logger.InfoLevel) {
+			logger.Infof("Broker [%s] Connected to %s", config.Broker.String(), config.Broker.Address())
 		}
 	}

 	// use RegisterCheck func before register
-	if err := g.opts.RegisterCheck(config.Context); err != nil {
-		if config.Logger.V(logger.ErrorLevel) {
-			config.Logger.Errorf(config.Context, "Server %s-%s register check error: %s", config.Name, config.Id, err)
+	if err := g.opts.RegisterCheck(g.opts.Context); err != nil {
+		if logger.V(logger.ErrorLevel) {
+			logger.Errorf("Server %s-%s register check error: %s", config.Name, config.Id, err)
 		}
 	} else {
 		// announce self to the world
 		if err := g.Register(); err != nil {
-			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(config.Context, "Server register error: %v", err)
+			if logger.V(logger.ErrorLevel) {
+				logger.Errorf("Server register error: %v", err)
 			}
 		}
 	}
@@ -900,12 +1038,12 @@ func (g *grpcServer) Start() error {
 	// micro: go ts.Accept(s.accept)
 	go func() {
 		if err := g.srv.Serve(ts); err != nil {
-			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(config.Context, "gRPC Server start error: %v", err)
+			if logger.V(logger.ErrorLevel) {
+				logger.Errorf("gRPC Server start error: %v", err)
 			}
 			if err := g.Stop(); err != nil {
-				if config.Logger.V(logger.ErrorLevel) {
-					config.Logger.Errorf(config.Context, "gRPC Server stop error: %v", err)
+				if logger.V(logger.ErrorLevel) {
+					logger.Errorf("gRPC Server stop error: %v", err)
 				}
 			}
 		}
@@ -933,24 +1071,24 @@ func (g *grpcServer) Start() error {
 				g.RUnlock()
 				rerr := g.opts.RegisterCheck(g.opts.Context)
 				if rerr != nil && registered {
-					if config.Logger.V(logger.ErrorLevel) {
-						config.Logger.Errorf(config.Context, "Server %s-%s register check error: %s, deregister it", config.Name, config.Id, rerr)
+					if logger.V(logger.ErrorLevel) {
+						logger.Errorf("Server %s-%s register check error: %s, deregister it", config.Name, config.Id, rerr)
 					}
 					// deregister self in case of error
 					if err := g.Deregister(); err != nil {
-						if config.Logger.V(logger.ErrorLevel) {
-							config.Logger.Errorf(config.Context, "Server %s-%s deregister error: %s", config.Name, config.Id, err)
+						if logger.V(logger.ErrorLevel) {
+							logger.Errorf("Server %s-%s deregister error: %s", config.Name, config.Id, err)
 						}
 					}
 				} else if rerr != nil && !registered {
-					if config.Logger.V(logger.ErrorLevel) {
-						config.Logger.Errorf(config.Context, "Server %s-%s register check error: %s", config.Name, config.Id, rerr)
+					if logger.V(logger.ErrorLevel) {
+						logger.Errorf("Server %s-%s register check error: %s", config.Name, config.Id, rerr)
 					}
 					continue
 				}
 				if err := g.Register(); err != nil {
-					if config.Logger.V(logger.ErrorLevel) {
-						config.Logger.Errorf(config.Context, "Server %s-%s register error: %s", config.Name, config.Id, err)
+					if logger.V(logger.ErrorLevel) {
+						logger.Errorf("Server %s-%s register error: %s", config.Name, config.Id, err)
 					}
 				}
 			// wait for exit
@@ -961,8 +1099,8 @@ func (g *grpcServer) Start() error {

 		// deregister self
 		if err := g.Deregister(); err != nil {
-			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(config.Context, "Server deregister error: ", err)
+			if logger.V(logger.ErrorLevel) {
+				logger.Error("Server deregister error: ", err)
 			}
 		}

@@ -988,13 +1126,13 @@ func (g *grpcServer) Start() error {
 		// close transport
 		ch <- nil

-		if config.Logger.V(logger.InfoLevel) {
-			config.Logger.Infof(config.Context, "Broker [%s] Disconnected from %s", config.Broker.String(), config.Broker.Address())
+		if logger.V(logger.InfoLevel) {
+			logger.Infof("Broker [%s] Disconnected from %s", config.Broker.String(), config.Broker.Address())
 		}
 		// disconnect broker
-		if err := config.Broker.Disconnect(config.Context); err != nil {
-			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(config.Context, "Broker [%s] disconnect error: %v", config.Broker.String(), err)
+		if err := config.Broker.Disconnect(); err != nil {
+			if logger.V(logger.ErrorLevel) {
+				logger.Errorf("Broker [%s] disconnect error: %v", config.Broker.String(), err)
 			}
 		}
 	}()
@@ -1031,10 +1169,6 @@ func (g *grpcServer) String() string {
 	return "grpc"
 }

-func (g *grpcServer) Name() string {
-	return g.opts.Name
-}
-
 func NewServer(opts ...server.Option) server.Server {
 	return newGRPCServer(opts...)
 }
--- a/handler.go
+++ b/handler.go
@@ -3,28 +3,34 @@ package grpc
 import (
 	"reflect"

-	"github.com/unistack-org/micro/v3/register"
+	"github.com/unistack-org/micro/v3/registry"
 	"github.com/unistack-org/micro/v3/server"
 )

 type rpcHandler struct {
 	name      string
 	handler   interface{}
-	endpoints []*register.Endpoint
+	endpoints []*registry.Endpoint
 	opts      server.HandlerOptions
 }

 func newRpcHandler(handler interface{}, opts ...server.HandlerOption) server.Handler {
-	options := server.NewHandlerOptions(opts...)
+	options := server.HandlerOptions{
+		Metadata: make(map[string]map[string]string),
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}

 	typ := reflect.TypeOf(handler)
 	hdlr := reflect.ValueOf(handler)
 	name := reflect.Indirect(hdlr).Type().Name()

-	var endpoints []*register.Endpoint
+	var endpoints []*registry.Endpoint

 	for m := 0; m < typ.NumMethod(); m++ {
-		if e := register.ExtractEndpoint(typ.Method(m)); e != nil {
+		if e := extractEndpoint(typ.Method(m)); e != nil {
 			e.Name = name + "." + e.Name

 			for k, v := range options.Metadata[e.Name] {
@@ -51,7 +57,7 @@ func (r *rpcHandler) Handler() interface{} {
 	return r.handler
 }

-func (r *rpcHandler) Endpoints() []*register.Endpoint {
+func (r *rpcHandler) Endpoints() []*registry.Endpoint {
 	return r.endpoints
 }

--- a/options.go
+++ b/options.go
@@ -3,6 +3,7 @@ package grpc
 import (
 	"context"
 	"crypto/tls"
+	"net"

 	"github.com/unistack-org/micro/v3/server"
 	"google.golang.org/grpc"
@@ -11,7 +12,9 @@ import (

 type codecsKey struct{}
 type grpcOptions struct{}
+type netListener struct{}
 type maxMsgSizeKey struct{}
+type maxConnKey struct{}
 type tlsAuth struct{}
 type reflectionKey struct{}

@@ -35,6 +38,16 @@ func AuthTLS(t *tls.Config) server.Option {
 	return setServerOption(tlsAuth{}, t)
 }

+// MaxConn specifies maximum number of max simultaneous connections to server
+func MaxConn(n int) server.Option {
+	return setServerOption(maxConnKey{}, n)
+}
+
+// Listener specifies the net.Listener to use instead of the default
+func Listener(l net.Listener) server.Option {
+	return setServerOption(netListener{}, l)
+}
+
 // Options to be used to configure gRPC options
 func Options(opts ...grpc.ServerOption) server.Option {
 	return setServerOption(grpcOptions{}, opts)
--- a/request.go
+++ b/request.go
@@ -1,21 +1,16 @@
 package grpc

 import (
-	"io"
-
 	"github.com/unistack-org/micro/v3/codec"
-	"github.com/unistack-org/micro/v3/metadata"
+	"github.com/unistack-org/micro-codec-bytes"
 )

 type rpcRequest struct {
-	rw          io.ReadWriter
 	service     string
 	method      string
-	endpoint    string
-	target      string
 	contentType string
 	codec       codec.Codec
-	header      metadata.Metadata
+	header      map[string]string
 	body        []byte
 	stream      bool
 	payload     interface{}
@@ -25,7 +20,7 @@ type rpcMessage struct {
 	topic       string
 	contentType string
 	payload     interface{}
-	header      metadata.Metadata
+	header      map[string]string
 	body        []byte
 	codec       codec.Codec
 }
@@ -46,17 +41,17 @@ func (r *rpcRequest) Endpoint() string {
 	return r.method
 }

-func (r *rpcRequest) Codec() codec.Codec {
+func (r *rpcRequest) Codec() codec.Reader {
 	return r.codec
 }

-func (r *rpcRequest) Header() metadata.Metadata {
+func (r *rpcRequest) Header() map[string]string {
 	return r.header
 }

 func (r *rpcRequest) Read() ([]byte, error) {
-	f := &codec.Frame{}
-	if err := r.codec.ReadBody(r.rw, f); err != nil {
+	f := &bytes.Frame{}
+	if err := r.codec.ReadBody(f); err != nil {
 		return nil, err
 	}
 	return f.Data, nil
@@ -82,7 +77,7 @@ func (r *rpcMessage) Payload() interface{} {
 	return r.payload
 }

-func (r *rpcMessage) Header() metadata.Metadata {
+func (r *rpcMessage) Header() map[string]string {
 	return r.header
 }

@@ -90,6 +85,6 @@ func (r *rpcMessage) Body() []byte {
 	return r.body
 }

-func (r *rpcMessage) Codec() codec.Codec {
+func (r *rpcMessage) Codec() codec.Reader {
 	return r.codec
 }
--- a/response.go
+++ b/response.go
@@ -1,34 +1,26 @@
 package grpc

 import (
-	"io"
-
 	"github.com/unistack-org/micro/v3/codec"
-	"github.com/unistack-org/micro/v3/metadata"
 )

 type rpcResponse struct {
-	rw       io.ReadWriter
-	header   metadata.Metadata
-	codec    codec.Codec
-	endpoint string
-	service  string
-	method   string
-	target   string
+	header map[string]string
+	codec  codec.Codec
 }

-func (r *rpcResponse) Codec() codec.Codec {
+func (r *rpcResponse) Codec() codec.Writer {
 	return r.codec
 }

-func (r *rpcResponse) WriteHeader(hdr metadata.Metadata) {
+func (r *rpcResponse) WriteHeader(hdr map[string]string) {
 	for k, v := range hdr {
 		r.header[k] = v
 	}
 }

 func (r *rpcResponse) Write(b []byte) error {
-	return r.codec.Write(r.rw, &codec.Message{
+	return r.codec.Write(&codec.Message{
 		Header: r.header,
 		Body:   b,
 	}, nil)
--- a/server.go
+++ b/server.go
@@ -14,6 +14,7 @@ import (
 	"unicode"
 	"unicode/utf8"

+	"github.com/unistack-org/micro/v3/logger"
 	"github.com/unistack-org/micro/v3/server"
 )

@@ -65,7 +66,7 @@ func isExportedOrBuiltinType(t reflect.Type) bool {

 // prepareEndpoint() returns a methodType for the provided method or nil
 // in case if the method was unsuitable.
-func prepareEndpoint(method reflect.Method) (*methodType, error) {
+func prepareEndpoint(method reflect.Method) *methodType {
 	mtype := method.Type
 	mname := method.Name
 	var replyType, argType, contextType reflect.Type
@@ -73,7 +74,7 @@ func prepareEndpoint(method reflect.Method) (*methodType, error) {

 	// Endpoint() must be exported.
 	if method.PkgPath != "" {
-		return nil, fmt.Errorf("Endpoint must be exported")
+		return nil
 	}

 	switch mtype.NumIn() {
@@ -88,42 +89,63 @@ func prepareEndpoint(method reflect.Method) (*methodType, error) {
 		replyType = mtype.In(3)
 		contextType = mtype.In(1)
 	default:
-		return nil, fmt.Errorf("method %v of %v has wrong number of ins: %v", mname, mtype, mtype.NumIn())
+		if logger.V(logger.ErrorLevel) {
+			logger.Errorf("method %v of %v has wrong number of ins: %v", mname, mtype, mtype.NumIn())
+		}
+		return nil
 	}

 	if stream {
 		// check stream type
 		streamType := reflect.TypeOf((*server.Stream)(nil)).Elem()
 		if !argType.Implements(streamType) {
-			return nil, fmt.Errorf("%v argument does not implement Streamer interface: %v", mname, argType)
+			if logger.V(logger.ErrorLevel) {
+				logger.Errorf("%v argument does not implement Streamer interface: %v", mname, argType)
+			}
+			return nil
 		}
 	} else {
 		// if not stream check the replyType

 		// First arg need not be a pointer.
 		if !isExportedOrBuiltinType(argType) {
-			return nil, fmt.Errorf("%v argument type not exported: %v", mname, argType)
+			if logger.V(logger.ErrorLevel) {
+				logger.Errorf("%v argument type not exported: %v", mname, argType)
+			}
+			return nil
 		}

 		if replyType.Kind() != reflect.Ptr {
-			return nil, fmt.Errorf("method %v reply type not a pointer: %v", mname, replyType)
+			if logger.V(logger.ErrorLevel) {
+				logger.Errorf("method %v reply type not a pointer: %v", mname, replyType)
+			}
+			return nil
 		}

 		// Reply type must be exported.
 		if !isExportedOrBuiltinType(replyType) {
-			return nil, fmt.Errorf("method %v reply type not exported: %v", mname, replyType)
+			if logger.V(logger.ErrorLevel) {
+				logger.Errorf("method %v reply type not exported: %v", mname, replyType)
+			}
+			return nil
 		}
 	}

 	// Endpoint() needs one out.
 	if mtype.NumOut() != 1 {
-		return nil, fmt.Errorf("method %v has wrong number of outs: %v", mname, mtype.NumOut())
+		if logger.V(logger.ErrorLevel) {
+			logger.Errorf("method %v has wrong number of outs: %v", mname, mtype.NumOut())
+		}
+		return nil
 	}
 	// The return type of the method must be error.
 	if returnType := mtype.Out(0); returnType != typeOfError {
-		return nil, fmt.Errorf("method %v returns %v not error", mname, returnType.String())
+		if logger.V(logger.ErrorLevel) {
+			logger.Errorf("method %v returns %v not error", mname, returnType.String())
+		}
+		return nil
 	}
-	return &methodType{method: method, ArgType: argType, ReplyType: replyType, ContextType: contextType, stream: stream}, nil
+	return &methodType{method: method, ArgType: argType, ReplyType: replyType, ContextType: contextType, stream: stream}
 }

 func (server *rServer) register(rcvr interface{}) error {
@@ -140,7 +162,11 @@ func (server *rServer) register(rcvr interface{}) error {
 		return fmt.Errorf("rpc: no service name for type %v", s.typ.String())
 	}
 	if !isExported(sname) {
-		return fmt.Errorf("rpc Register: type %s is not exported", sname)
+		s := "rpc Register: type " + sname + " is not exported"
+		if logger.V(logger.ErrorLevel) {
+			logger.Error(s)
+		}
+		return fmt.Errorf(s)
 	}
 	if _, present := server.serviceMap[sname]; present {
 		return fmt.Errorf("rpc: service already defined: " + sname)
@@ -151,16 +177,17 @@ func (server *rServer) register(rcvr interface{}) error {
 	// Install the methods
 	for m := 0; m < s.typ.NumMethod(); m++ {
 		method := s.typ.Method(m)
-		mt, err := prepareEndpoint(method)
-		if mt != nil && err == nil {
+		if mt := prepareEndpoint(method); mt != nil {
 			s.method[method.Name] = mt
-		} else if err != nil {
-			return err
 		}
 	}

 	if len(s.method) == 0 {
-		return fmt.Errorf("rpc Register: type %s has no exported methods of suitable type", sname)
+		s := "rpc Register: type " + sname + " has no exported methods of suitable type"
+		if logger.V(logger.ErrorLevel) {
+			logger.Error(s)
+		}
+		return fmt.Errorf(s)
 	}
 	server.serviceMap[s.name] = s
 	return nil
--- a/subscriber.go
+++ b/subscriber.go
@@ -11,7 +11,7 @@ import (
 	"github.com/unistack-org/micro/v3/errors"
 	"github.com/unistack-org/micro/v3/logger"
 	"github.com/unistack-org/micro/v3/metadata"
-	"github.com/unistack-org/micro/v3/register"
+	"github.com/unistack-org/micro/v3/registry"
 	"github.com/unistack-org/micro/v3/server"
 )

@@ -31,14 +31,17 @@ type subscriber struct {
 	typ        reflect.Type
 	subscriber interface{}
 	handlers   []*handler
-	endpoints  []*register.Endpoint
+	endpoints  []*registry.Endpoint
 	opts       server.SubscriberOptions
 }

 func newSubscriber(topic string, sub interface{}, opts ...server.SubscriberOption) server.Subscriber {
-	options := server.NewSubscriberOptions(opts...)
+	options := server.NewSubscriberOptions()
+	for _, o := range opts {
+		o(&options)
+	}

-	var endpoints []*register.Endpoint
+	var endpoints []*registry.Endpoint
 	var handlers []*handler

 	if typ := reflect.TypeOf(sub); typ.Kind() == reflect.Func {
@@ -56,9 +59,9 @@ func newSubscriber(topic string, sub interface{}, opts ...server.SubscriberOptio

 		handlers = append(handlers, h)

-		endpoints = append(endpoints, &register.Endpoint{
+		endpoints = append(endpoints, &registry.Endpoint{
 			Name:    "Func",
-			Request: register.ExtractSubValue(typ),
+			Request: extractSubValue(typ),
 			Metadata: map[string]string{
 				"topic":      topic,
 				"subscriber": "true",
@@ -84,9 +87,9 @@ func newSubscriber(topic string, sub interface{}, opts ...server.SubscriberOptio

 			handlers = append(handlers, h)

-			endpoints = append(endpoints, &register.Endpoint{
+			endpoints = append(endpoints, &registry.Endpoint{
 				Name:    name + "." + method.Name,
-				Request: register.ExtractSubValue(method.Type),
+				Request: extractSubValue(method.Type),
 				Metadata: map[string]string{
 					"topic":      topic,
 					"subscriber": "true",
@@ -106,13 +109,67 @@ func newSubscriber(topic string, sub interface{}, opts ...server.SubscriberOptio
 	}
 }

+func validateSubscriber(sub server.Subscriber) error {
+	typ := reflect.TypeOf(sub.Subscriber())
+	var argType reflect.Type
+
+	if typ.Kind() == reflect.Func {
+		name := "Func"
+		switch typ.NumIn() {
+		case 2:
+			argType = typ.In(1)
+		default:
+			return fmt.Errorf("subscriber %v takes wrong number of args: %v required signature %s", name, typ.NumIn(), subSig)
+		}
+		if !isExportedOrBuiltinType(argType) {
+			return fmt.Errorf("subscriber %v argument type not exported: %v", name, argType)
+		}
+		if typ.NumOut() != 1 {
+			return fmt.Errorf("subscriber %v has wrong number of outs: %v require signature %s",
+				name, typ.NumOut(), subSig)
+		}
+		if returnType := typ.Out(0); returnType != typeOfError {
+			return fmt.Errorf("subscriber %v returns %v not error", name, returnType.String())
+		}
+	} else {
+		hdlr := reflect.ValueOf(sub.Subscriber())
+		name := reflect.Indirect(hdlr).Type().Name()
+
+		for m := 0; m < typ.NumMethod(); m++ {
+			method := typ.Method(m)
+
+			switch method.Type.NumIn() {
+			case 3:
+				argType = method.Type.In(2)
+			default:
+				return fmt.Errorf("subscriber %v.%v takes wrong number of args: %v required signature %s",
+					name, method.Name, method.Type.NumIn(), subSig)
+			}
+
+			if !isExportedOrBuiltinType(argType) {
+				return fmt.Errorf("%v argument type not exported: %v", name, argType)
+			}
+			if method.Type.NumOut() != 1 {
+				return fmt.Errorf(
+					"subscriber %v.%v has wrong number of outs: %v require signature %s",
+					name, method.Name, method.Type.NumOut(), subSig)
+			}
+			if returnType := method.Type.Out(0); returnType != typeOfError {
+				return fmt.Errorf("subscriber %v.%v returns %v not error", name, method.Name, returnType.String())
+			}
+		}
+	}
+
+	return nil
+}
+
 func (g *grpcServer) createSubHandler(sb *subscriber, opts server.Options) broker.Handler {
 	return func(p broker.Event) (err error) {
 		defer func() {
 			if r := recover(); r != nil {
-				if g.opts.Logger.V(logger.ErrorLevel) {
-					g.opts.Logger.Error(g.opts.Context, "panic recovered: ", r)
-					g.opts.Logger.Error(g.opts.Context, string(debug.Stack()))
+				if logger.V(logger.ErrorLevel) {
+					logger.Error("panic recovered: ", r)
+					logger.Error(string(debug.Stack()))
 				}
 				err = errors.InternalServerError(g.opts.Name+".subscriber", "panic recovered: %v", r)
 			}
@@ -129,7 +186,7 @@ func (g *grpcServer) createSubHandler(sb *subscriber, opts server.Options) broke
 			msg.Header["Content-Type"] = defaultContentType
 			ct = defaultContentType
 		}
-		cf, err := g.newCodec(ct)
+		cf, err := g.newGRPCCodec(ct)
 		if err != nil {
 			return err
 		}
@@ -224,7 +281,7 @@ func (s *subscriber) Subscriber() interface{} {
 	return s.subscriber
 }

-func (s *subscriber) Endpoints() []*register.Endpoint {
+func (s *subscriber) Endpoints() []*registry.Endpoint {
 	return s.endpoints
 }

--- a/util.go
+++ b/util.go
@@ -1,57 +0,0 @@
-package grpc
-
-import (
-	"fmt"
-	"strings"
-)
-
-// ServiceMethod converts a gRPC method to a Go method
-// Input:
-// Foo.Bar, /Foo/Bar, /package.Foo/Bar, /a.package.Foo/Bar
-// Output:
-// [Foo, Bar]
-func serviceMethod(m string) (string, string, error) {
-	if len(m) == 0 {
-		return "", "", fmt.Errorf("malformed method name: %q", m)
-	}
-
-	// grpc method
-	if m[0] == '/' {
-		// [ , Foo, Bar]
-		// [ , package.Foo, Bar]
-		// [ , a.package.Foo, Bar]
-		parts := strings.Split(m, "/")
-		if len(parts) != 3 || len(parts[1]) == 0 || len(parts[2]) == 0 {
-			return "", "", fmt.Errorf("malformed method name: %q", m)
-		}
-		service := strings.Split(parts[1], ".")
-		return service[len(service)-1], parts[2], nil
-	}
-
-	// non grpc method
-	parts := strings.Split(m, ".")
-
-	// expect [Foo, Bar]
-	if len(parts) != 2 {
-		return "", "", fmt.Errorf("malformed method name: %q", m)
-	}
-
-	return parts[0], parts[1], nil
-}
-
-// ServiceFromMethod returns the service
-// /service.Foo/Bar => service
-func serviceFromMethod(m string) string {
-	if len(m) == 0 {
-		return m
-	}
-	if m[0] != '/' {
-		return m
-	}
-	parts := strings.Split(m, "/")
-	if len(parts) < 3 {
-		return m
-	}
-	parts = strings.Split(parts[1], ".")
-	return strings.Join(parts[:len(parts)-1], ".")
-}
--- a/util_test.go
+++ b/util_test.go
@@ -1,46 +0,0 @@
-package grpc
-
-import (
-	"testing"
-)
-
-func TestServiceMethod(t *testing.T) {
-	type testCase struct {
-		input   string
-		service string
-		method  string
-		err     bool
-	}
-
-	methods := []testCase{
-		{"Foo.Bar", "Foo", "Bar", false},
-		{"/Foo/Bar", "Foo", "Bar", false},
-		{"/package.Foo/Bar", "Foo", "Bar", false},
-		{"/a.package.Foo/Bar", "Foo", "Bar", false},
-		{"a.package.Foo/Bar", "", "", true},
-		{"/Foo/Bar/Baz", "", "", true},
-		{"Foo.Bar.Baz", "", "", true},
-	}
-	for _, test := range methods {
-		service, method, err := serviceMethod(test.input)
-		if err != nil && test.err == true {
-			continue
-		}
-		// unexpected error
-		if err != nil && test.err == false {
-			t.Fatalf("unexpected err %v for %+v", err, test)
-		}
-		// expecter error
-		if test.err == true && err == nil {
-			t.Fatalf("expected error for %+v: got service: %s method: %s", test, service, method)
-		}
-
-		if service != test.service {
-			t.Fatalf("wrong service for %+v: got service: %s method: %s", test, service, method)
-		}
-
-		if method != test.method {
-			t.Fatalf("wrong method for %+v: got service: %s method: %s", test, service, method)
-		}
-	}
-}