api: add static router and improve path parser in rpc handler (#1437)

* api: add static router and improve path parser in rpc handler

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

* expose metadata context key to be able to get unmodified map keys

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

* server/grpc: fix jsonpb codec for protobuf msg

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

* api/handler/rpc: write 204 status code when rsp is nil

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

* api/handler/rpc: add check for nil response for non javascript

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

api/service/proto/api.pb.go

@@ -0,0 +1,149 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: api.proto
+
+package go_micro_api
+
+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
+
+type Endpoint struct {
+	Name                 string   `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Host                 []string `protobuf:"bytes,2,rep,name=host,proto3" json:"host,omitempty"`
+	Path                 []string `protobuf:"bytes,3,rep,name=path,proto3" json:"path,omitempty"`
+	Method               []string `protobuf:"bytes,4,rep,name=method,proto3" json:"method,omitempty"`
+	Stream               bool     `protobuf:"varint,5,opt,name=stream,proto3" json:"stream,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Endpoint) Reset()         { *m = Endpoint{} }
+func (m *Endpoint) String() string { return proto.CompactTextString(m) }
+func (*Endpoint) ProtoMessage()    {}
+func (*Endpoint) Descriptor() ([]byte, []int) {
+	return fileDescriptor_00212fb1f9d3bf1c, []int{0}
+}
+
+func (m *Endpoint) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Endpoint.Unmarshal(m, b)
+}
+func (m *Endpoint) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Endpoint.Marshal(b, m, deterministic)
+}
+func (m *Endpoint) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Endpoint.Merge(m, src)
+}
+func (m *Endpoint) XXX_Size() int {
+	return xxx_messageInfo_Endpoint.Size(m)
+}
+func (m *Endpoint) XXX_DiscardUnknown() {
+	xxx_messageInfo_Endpoint.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Endpoint proto.InternalMessageInfo
+
+func (m *Endpoint) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+func (m *Endpoint) GetHost() []string {
+	if m != nil {
+		return m.Host
+	}
+	return nil
+}
+
+func (m *Endpoint) GetPath() []string {
+	if m != nil {
+		return m.Path
+	}
+	return nil
+}
+
+func (m *Endpoint) GetMethod() []string {
+	if m != nil {
+		return m.Method
+	}
+	return nil
+}
+
+func (m *Endpoint) GetStream() bool {
+	if m != nil {
+		return m.Stream
+	}
+	return false
+}
+
+type EmptyResponse struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *EmptyResponse) Reset()         { *m = EmptyResponse{} }
+func (m *EmptyResponse) String() string { return proto.CompactTextString(m) }
+func (*EmptyResponse) ProtoMessage()    {}
+func (*EmptyResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_00212fb1f9d3bf1c, []int{1}
+}
+
+func (m *EmptyResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_EmptyResponse.Unmarshal(m, b)
+}
+func (m *EmptyResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_EmptyResponse.Marshal(b, m, deterministic)
+}
+func (m *EmptyResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_EmptyResponse.Merge(m, src)
+}
+func (m *EmptyResponse) XXX_Size() int {
+	return xxx_messageInfo_EmptyResponse.Size(m)
+}
+func (m *EmptyResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_EmptyResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_EmptyResponse proto.InternalMessageInfo
+
+func init() {
+	proto.RegisterType((*Endpoint)(nil), "go.micro.api.Endpoint")
+	proto.RegisterType((*EmptyResponse)(nil), "go.micro.api.EmptyResponse")
+}
+
+func init() {
+	proto.RegisterFile("api.proto", fileDescriptor_00212fb1f9d3bf1c)
+}
+
+var fileDescriptor_00212fb1f9d3bf1c = []byte{
+	// 201 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xa4, 0xd0, 0x41, 0x4a, 0xc5, 0x30,
+	0x10, 0x06, 0x60, 0x63, 0x9f, 0x8f, 0xbe, 0x41, 0x11, 0xb2, 0x78, 0x04, 0xdd, 0x94, 0xae, 0xde,
+	0x2a, 0x0b, 0x3d, 0x41, 0xd1, 0x5e, 0x20, 0x37, 0x88, 0x76, 0x68, 0xb3, 0x48, 0x66, 0x48, 0x06,
+	0xc1, 0x43, 0x78, 0x67, 0x49, 0xad, 0x50, 0xdc, 0xba, 0xfb, 0xe7, 0x5b, 0xfc, 0xfc, 0x0c, 0x9c,
+	0x3c, 0x07, 0xcb, 0x99, 0x84, 0xf4, 0xed, 0x4c, 0x36, 0x86, 0xf7, 0x4c, 0xd6, 0x73, 0xe8, 0x3f,
+	0xa0, 0x1d, 0xd3, 0xc4, 0x14, 0x92, 0x68, 0x0d, 0x87, 0xe4, 0x23, 0x1a, 0xd5, 0xa9, 0xcb, 0xc9,
+	0xad, 0xb9, 0xda, 0x42, 0x45, 0xcc, 0x75, 0xd7, 0x54, 0xab, 0xb9, 0x1a, 0x7b, 0x59, 0x4c, 0xf3,
+	0x63, 0x35, 0xeb, 0x33, 0x1c, 0x23, 0xca, 0x42, 0x93, 0x39, 0xac, 0xba, 0x5d, 0xd5, 0x8b, 0x64,
+	0xf4, 0xd1, 0xdc, 0x74, 0xea, 0xd2, 0xba, 0xed, 0xea, 0xef, 0xe1, 0x6e, 0x8c, 0x2c, 0x9f, 0x0e,
+	0x0b, 0x53, 0x2a, 0xf8, 0xf4, 0xa5, 0xa0, 0x19, 0x38, 0xe8, 0x01, 0x5a, 0x87, 0x73, 0x28, 0x82,
+	0x59, 0x9f, 0xed, 0x7e, 0xab, 0xfd, 0x1d, 0xfa, 0xf0, 0xf8, 0xc7, 0xf7, 0x45, 0xfd, 0x95, 0x7e,
+	0x01, 0x78, 0xc5, 0xfc, 0xbf, 0x92, 0xb7, 0xe3, 0xfa, 0xad, 0xe7, 0xef, 0x00, 0x00, 0x00, 0xff,
+	0xff, 0x1f, 0xf0, 0xd9, 0x19, 0x3a, 0x01, 0x00, 0x00,
+}