remove transport draft, add grpc web and gateway support

.gitignore

@@ -1 +1,3 @@
 .idea
+.bin
+transport

Makefile

@@ -1,9 +1,67 @@
+MODULE = go.linka.cloud/grpc
 
 
-.PHONY: clean-example-proto
+PROTO_BASE_PATH = $(PWD)
-clean-example-proto:
+
-	@rm example/*.pb.go
+INCLUDE_PROTO_PATH = -I$(PROTO_BASE_PATH) \
+	-I $(shell go list -m -f {{.Dir}} google.golang.org/protobuf) \
+	-I $(shell go list -m -f {{.Dir}} go.linka.cloud/protoc-gen-defaults) \
+	-I $(shell go list -m -f {{.Dir}} go.linka.cloud/protofilters) \
+	-I $(shell go list -m -f {{.Dir}} github.com/envoyproxy/protoc-gen-validate) \
+	-I $(shell go list -m -f {{.Dir}} github.com/alta/protopatch) \
+	-I $(shell go list -m -f {{.Dir}} github.com/grpc-ecosystem/grpc-gateway/v2)
+
+PROTO_OPTS = paths=source_relative
+
+
+$(shell mkdir -p .bin)
+
+export GOBIN=$(PWD)/.bin
+
+export PATH := $(GOBIN):$(PATH)
+
+bin:
+	@go install github.com/golang/protobuf/protoc-gen-go
+	@go install google.golang.org/grpc/cmd/protoc-gen-go-grpc
+	@go install go.linka.cloud/protoc-gen-defaults
+	@go install go.linka.cloud/protoc-gen-go-fields
+	@go install github.com/envoyproxy/protoc-gen-validate
+	@go install github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway
+	@go install github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2
+	@go install github.com/alta/protopatch/cmd/protoc-gen-go-patch
+	@go install github.com/planetscale/vtprotobuf/cmd/protoc-gen-go-vtproto
+
+clean: clean-bin clean-proto
+
+clean-bin:
+	@rm -rf .bin
+
+clean-proto:
+	@find $(PROTO_BASE_PATH) -name '*.pb*.go' -type f -exec rm {} \;
+
+.PHONY: proto
+proto: tools.go gen-proto lint
+
+
+.PHONY: gen-proto
+gen-proto: bin
+	@find $(PROTO_BASE_PATH) -name '*.proto' -type f -not -path "$(PWD)/google/*" -exec \
+    	protoc $(INCLUDE_PROTO_PATH) \
+    		--go-patch_out=plugin=go,$(PROTO_OPTS):. \
+    		--go-patch_out=plugin=go-grpc,$(PROTO_OPTS):. \
+    		--go-patch_out=plugin=defaults,$(PROTO_OPTS):. \
+    		--go-patch_out=plugin=go-fields,$(PROTO_OPTS):. \
+    		--go-patch_out=plugin=grpc-gateway,$(PROTO_OPTS):. \
+    		--go-patch_out=plugin=openapiv2:. \
+    		--go-patch_out=plugin=go-vtproto,features=marshal+unmarshal+size,$(PROTO_OPTS):. \
+    		--go-patch_out=plugin=validate,lang=go,$(PROTO_OPTS):. {} \;
+
+.PHONY: lint
+lint:
+	@goimports -w -local $(MODULE) $(PWD)
+	@gofmt -w $(PWD)
+
+.PHONY: tests
+tests: proto
+	@go test -v ./...
 
-.PHONY: example-proto
-example-proto:
-	@protoc -I. -Iexample --go_out=paths=source_relative:. --go-grpc_out=paths=source_relative:. example/example.proto

client/client.go

@@ -33,6 +33,9 @@ func New(opts ...Option) (Client, error) {
 	if c.opts.tlsConfig != nil {
 		c.opts.dialOptions = append(c.opts.dialOptions, grpc.WithTransportCredentials(credentials.NewTLS(c.opts.tlsConfig)))
 	}
+	if !c.opts.secure {
+		c.opts.dialOptions = append(c.opts.dialOptions, grpc.WithInsecure())
+	}
 	c.addr = fmt.Sprintf("%s:///%s", c.opts.registry.String(), c.opts.name)
 	if c.opts.version != "" {
 		c.addr = c.addr + ":" + strings.TrimSpace(c.opts.version)

client/pool.go

@@ -1,6 +1,6 @@
 /*
 Taken from the https://github.com/micro/go-micro/client/grpc
- */
+*/
 
 package client
 

example/example.go

@@ -2,10 +2,13 @@ package main
 
 import (
 	"context"
+	"crypto/tls"
 	"errors"
 	"fmt"
 	"io"
-	"time"
+	"io/ioutil"
+	"net/http"
+	"strings"
 
 	"github.com/sirupsen/logrus"
 
@@ -14,7 +17,7 @@ import (
 	"go.linka.cloud/grpc/service"
 )
 
-type GreeterHandler struct{
+type GreeterHandler struct {
 	UnimplementedGreeterServer
 }
 
@@ -31,27 +34,29 @@ func (g *GreeterHandler) SayHelloStream(req *HelloStreamRequest, s Greeter_SayHe
 		if err := s.Send(&HelloReply{Message: fmt.Sprintf("Hello %s (%d)!", req.Name, i+1)}); err != nil {
 			return err
 		}
-		time.Sleep(time.Second)
+		// time.Sleep(time.Second)
 	}
 	return nil
 }
 
 func main() {
 	name := "greeter"
+	secure := true
 	ctx, cancel := context.WithCancel(context.Background())
 	done := make(chan struct{})
 	ready := make(chan struct{})
 	defer cancel()
 	var svc service.Service
 	var err error
+	address := "0.0.0.0:9991"
 	svc, err = service.New(
 		service.WithContext(ctx),
 		service.WithName(name),
 		service.WithVersion("v0.0.1"),
-		service.WithAddress("0.0.0.0:9991"),
+		service.WithAddress(address),
 		service.WithRegistry(mdns.NewRegistry()),
 		service.WithReflection(true),
-		service.WithSecure(true),
+		service.WithSecure(secure),
 		service.WithAfterStart(func() error {
 			fmt.Println("Server listening on", svc.Options().Address())
 			close(ready)
@@ -62,6 +67,10 @@ func main() {
 			close(done)
 			return nil
 		}),
+		service.WithGateway(RegisterGreeterHandler),
+		service.WithGatewayPrefix("/rest"),
+		service.WithGRPCWeb(true),
+		service.WithGRPCWebPrefix("/grpc"),
 	)
 	if err != nil {
 		panic(err)
@@ -77,7 +86,7 @@ func main() {
 		client.WithName("greeter"),
 		client.WithVersion("v0.0.1"),
 		client.WithRegistry(mdns.NewRegistry()),
-		client.WithSecure(true),
+		client.WithSecure(secure),
 	)
 	if err != nil {
 		logrus.Fatal(err)
@@ -103,6 +112,34 @@ func main() {
 		}
 		logrus.Infof("received stream message: %s", m.Message)
 	}
+	scheme := "http://"
+	if secure {
+		scheme = "https://"
+	}
+	httpc := &http.Client{
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{
+				InsecureSkipVerify: true,
+			},
+		},
+	}
+	req := `{"name":"test"}`
+
+	do := func(url, contentType string) {
+		resp, err := httpc.Post(url, contentType, strings.NewReader(req))
+		if err != nil {
+			logrus.Fatal(err)
+		}
+		defer resp.Body.Close()
+		b, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+		logrus.Info(string(b))
+	}
+	do(scheme+address+"/rest/api/v1/greeter/hello",  "application/json")
+	do(scheme+address+"/grpc/helloworld.Greeter/SayHello", "application/grpc-web+json")
 	cancel()
 	<-done
 }
+

example/example.pb.defaults.go

@@ -0,0 +1,24 @@
+// Code generated by protoc-gen-defaults. DO NOT EDIT.
+
+package main
+
+import (
+	"google.golang.org/protobuf/types/known/durationpb"
+	"google.golang.org/protobuf/types/known/timestamppb"
+	"google.golang.org/protobuf/types/known/wrapperspb"
+)
+
+var (
+	_ *timestamppb.Timestamp
+	_ *durationpb.Duration
+	_ *wrapperspb.BoolValue
+)
+
+func (x *HelloRequest) Default() {
+}
+
+func (x *HelloReply) Default() {
+}
+
+func (x *HelloStreamRequest) Default() {
+}

example/example.pb.fields.go

@@ -0,0 +1,21 @@
+package main
+
+var HelloRequestFields = struct {
+	Name string
+}{
+	Name: "name",
+}
+
+var HelloReplyFields = struct {
+	Message string
+}{
+	Message: "message",
+}
+
+var HelloStreamRequestFields = struct {
+	Name  string
+	Count string
+}{
+	Name:  "name",
+	Count: "count",
+}

example/example.pb.go

@@ -1,17 +1,18 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.23.0
+// 	protoc-gen-go v1.27.1
-// 	protoc        v3.13.0
+// 	protoc        v3.17.3
 // source: example/example.proto
 
 package main
 
 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"
+
+	_ "google.golang.org/genproto/googleapis/api/annotations"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 )
 
 const (
@@ -21,10 +22,6 @@ const (
 	_ = 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 HelloRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -179,27 +176,32 @@ var File_example_example_proto protoreflect.FileDescriptor
 var file_example_example_proto_rawDesc = []byte{
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-	0x33,
 }
 
 var (

example/example.pb.gw.go

@@ -0,0 +1,167 @@
+// Code generated by protoc-gen-grpc-gateway. DO NOT EDIT.
+// source: example/example.proto
+
+/*
+Package main is a reverse proxy.
+
+It translates gRPC into RESTful JSON APIs.
+*/
+package main
+
+import (
+	"context"
+	"io"
+	"net/http"
+
+	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+	"github.com/grpc-ecosystem/grpc-gateway/v2/utilities"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/proto"
+)
+
+// Suppress "imported and not used" errors
+var _ codes.Code
+var _ io.Reader
+var _ status.Status
+var _ = runtime.String
+var _ = utilities.NewDoubleArray
+var _ = metadata.Join
+
+func request_Greeter_SayHello_0(ctx context.Context, marshaler runtime.Marshaler, client GreeterClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq HelloRequest
+	var metadata runtime.ServerMetadata
+
+	newReader, berr := utilities.IOReaderFactory(req.Body)
+	if berr != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", berr)
+	}
+	if err := marshaler.NewDecoder(newReader()).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := client.SayHello(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
+func local_request_Greeter_SayHello_0(ctx context.Context, marshaler runtime.Marshaler, server GreeterServer, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq HelloRequest
+	var metadata runtime.ServerMetadata
+
+	newReader, berr := utilities.IOReaderFactory(req.Body)
+	if berr != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", berr)
+	}
+	if err := marshaler.NewDecoder(newReader()).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := server.SayHello(ctx, &protoReq)
+	return msg, metadata, err
+
+}
+
+// RegisterGreeterHandlerServer registers the http handlers for service Greeter to "mux".
+// UnaryRPC     :call GreeterServer directly.
+// StreamingRPC :currently unsupported pending https://github.com/grpc/grpc-go/issues/906.
+// Note that using this registration option will cause many gRPC library features to stop working. Consider using RegisterGreeterHandlerFromEndpoint instead.
+func RegisterGreeterHandlerServer(ctx context.Context, mux *runtime.ServeMux, server GreeterServer) error {
+
+	mux.Handle("POST", pattern_Greeter_SayHello_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		var stream runtime.ServerTransportStream
+		ctx = grpc.NewContextWithServerTransportStream(ctx, &stream)
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateIncomingContext(ctx, mux, req, "/helloworld.Greeter/SayHello", runtime.WithHTTPPathPattern("/api/v1/greeter/hello"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := local_request_Greeter_SayHello_0(rctx, inboundMarshaler, server, req, pathParams)
+		md.HeaderMD, md.TrailerMD = metadata.Join(md.HeaderMD, stream.Header()), metadata.Join(md.TrailerMD, stream.Trailer())
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_Greeter_SayHello_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
+	return nil
+}
+
+// RegisterGreeterHandlerFromEndpoint is same as RegisterGreeterHandler but
+// automatically dials to "endpoint" and closes the connection when "ctx" gets done.
+func RegisterGreeterHandlerFromEndpoint(ctx context.Context, mux *runtime.ServeMux, endpoint string, opts []grpc.DialOption) (err error) {
+	conn, err := grpc.Dial(endpoint, opts...)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err != nil {
+			if cerr := conn.Close(); cerr != nil {
+				grpclog.Infof("Failed to close conn to %s: %v", endpoint, cerr)
+			}
+			return
+		}
+		go func() {
+			<-ctx.Done()
+			if cerr := conn.Close(); cerr != nil {
+				grpclog.Infof("Failed to close conn to %s: %v", endpoint, cerr)
+			}
+		}()
+	}()
+
+	return RegisterGreeterHandler(ctx, mux, conn)
+}
+
+// RegisterGreeterHandler registers the http handlers for service Greeter to "mux".
+// The handlers forward requests to the grpc endpoint over "conn".
+func RegisterGreeterHandler(ctx context.Context, mux *runtime.ServeMux, cc grpc.ClientConnInterface) error {
+	return RegisterGreeterHandlerClient(ctx, mux, NewGreeterClient(cc))
+}
+
+// RegisterGreeterHandlerClient registers the http handlers for service Greeter
+// to "mux". The handlers forward requests to the grpc endpoint over the given implementation of "GreeterClient".
+// Note: the gRPC framework executes interceptors within the gRPC handler. If the passed in "GreeterClient"
+// doesn't go through the normal gRPC flow (creating a gRPC client etc.) then it will be up to the passed in
+// "GreeterClient" to call the correct interceptors.
+func RegisterGreeterHandlerClient(ctx context.Context, mux *runtime.ServeMux, client GreeterClient) error {
+
+	mux.Handle("POST", pattern_Greeter_SayHello_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateContext(ctx, mux, req, "/helloworld.Greeter/SayHello", runtime.WithHTTPPathPattern("/api/v1/greeter/hello"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := request_Greeter_SayHello_0(rctx, inboundMarshaler, client, req, pathParams)
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_Greeter_SayHello_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
+	return nil
+}
+
+var (
+	pattern_Greeter_SayHello_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2, 2, 3}, []string{"api", "v1", "greeter", "hello"}, ""))
+)
+
+var (
+	forward_Greeter_SayHello_0 = runtime.ForwardResponseMessage
+)

example/example.pb.validate.go

@@ -0,0 +1,313 @@
+// Code generated by protoc-gen-validate. DO NOT EDIT.
+// source: example/example.proto
+
+package main
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"net"
+	"net/mail"
+	"net/url"
+	"regexp"
+	"strings"
+	"time"
+	"unicode/utf8"
+
+	"google.golang.org/protobuf/types/known/anypb"
+)
+
+// ensure the imports are used
+var (
+	_ = bytes.MinRead
+	_ = errors.New("")
+	_ = fmt.Print
+	_ = utf8.UTFMax
+	_ = (*regexp.Regexp)(nil)
+	_ = (*strings.Reader)(nil)
+	_ = net.IPv4len
+	_ = time.Duration(0)
+	_ = (*url.URL)(nil)
+	_ = (*mail.Address)(nil)
+	_ = anypb.Any{}
+)
+
+// Validate checks the field values on HelloRequest with the rules defined in
+// the proto definition for this message. If any rules are violated, an error
+// is returned. When asked to return all errors, validation continues after
+// first violation, and the result is a list of violation errors wrapped in
+// HelloRequestMultiError, or nil if none found. Otherwise, only the first
+// error is returned, if any.
+func (m *HelloRequest) Validate(all bool) error {
+	if m == nil {
+		return nil
+	}
+
+	var errors []error
+
+	// no validation rules for Name
+
+	if len(errors) > 0 {
+		return HelloRequestMultiError(errors)
+	}
+	return nil
+}
+
+// HelloRequestMultiError is an error wrapping multiple validation errors
+// returned by HelloRequest.Validate(true) if the designated constraints
+// aren't met.
+type HelloRequestMultiError []error
+
+// Error returns a concatenation of all the error messages it wraps.
+func (m HelloRequestMultiError) Error() string {
+	var msgs []string
+	for _, err := range m {
+		msgs = append(msgs, err.Error())
+	}
+	return strings.Join(msgs, "; ")
+}
+
+// AllErrors returns a list of validation violation errors.
+func (m HelloRequestMultiError) AllErrors() []error { return m }
+
+// HelloRequestValidationError is the validation error returned by
+// HelloRequest.Validate if the designated constraints aren't met.
+type HelloRequestValidationError struct {
+	field  string
+	reason string
+	cause  error
+	key    bool
+}
+
+// Field function returns field value.
+func (e HelloRequestValidationError) Field() string { return e.field }
+
+// Reason function returns reason value.
+func (e HelloRequestValidationError) Reason() string { return e.reason }
+
+// Cause function returns cause value.
+func (e HelloRequestValidationError) Cause() error { return e.cause }
+
+// Key function returns key value.
+func (e HelloRequestValidationError) Key() bool { return e.key }
+
+// ErrorName returns error name.
+func (e HelloRequestValidationError) ErrorName() string { return "HelloRequestValidationError" }
+
+// Error satisfies the builtin error interface
+func (e HelloRequestValidationError) Error() string {
+	cause := ""
+	if e.cause != nil {
+		cause = fmt.Sprintf(" | caused by: %v", e.cause)
+	}
+
+	key := ""
+	if e.key {
+		key = "key for "
+	}
+
+	return fmt.Sprintf(
+		"invalid %sHelloRequest.%s: %s%s",
+		key,
+		e.field,
+		e.reason,
+		cause)
+}
+
+var _ error = HelloRequestValidationError{}
+
+var _ interface {
+	Field() string
+	Reason() string
+	Key() bool
+	Cause() error
+	ErrorName() string
+} = HelloRequestValidationError{}
+
+// Validate checks the field values on HelloReply with the rules defined in the
+// proto definition for this message. If any rules are violated, an error is
+// returned. When asked to return all errors, validation continues after first
+// violation, and the result is a list of violation errors wrapped in
+// HelloReplyMultiError, or nil if none found. Otherwise, only the first error
+// is returned, if any.
+func (m *HelloReply) Validate(all bool) error {
+	if m == nil {
+		return nil
+	}
+
+	var errors []error
+
+	// no validation rules for Message
+
+	if len(errors) > 0 {
+		return HelloReplyMultiError(errors)
+	}
+	return nil
+}
+
+// HelloReplyMultiError is an error wrapping multiple validation errors
+// returned by HelloReply.Validate(true) if the designated constraints aren't met.
+type HelloReplyMultiError []error
+
+// Error returns a concatenation of all the error messages it wraps.
+func (m HelloReplyMultiError) Error() string {
+	var msgs []string
+	for _, err := range m {
+		msgs = append(msgs, err.Error())
+	}
+	return strings.Join(msgs, "; ")
+}
+
+// AllErrors returns a list of validation violation errors.
+func (m HelloReplyMultiError) AllErrors() []error { return m }
+
+// HelloReplyValidationError is the validation error returned by
+// HelloReply.Validate if the designated constraints aren't met.
+type HelloReplyValidationError struct {
+	field  string
+	reason string
+	cause  error
+	key    bool
+}
+
+// Field function returns field value.
+func (e HelloReplyValidationError) Field() string { return e.field }
+
+// Reason function returns reason value.
+func (e HelloReplyValidationError) Reason() string { return e.reason }
+
+// Cause function returns cause value.
+func (e HelloReplyValidationError) Cause() error { return e.cause }
+
+// Key function returns key value.
+func (e HelloReplyValidationError) Key() bool { return e.key }
+
+// ErrorName returns error name.
+func (e HelloReplyValidationError) ErrorName() string { return "HelloReplyValidationError" }
+
+// Error satisfies the builtin error interface
+func (e HelloReplyValidationError) Error() string {
+	cause := ""
+	if e.cause != nil {
+		cause = fmt.Sprintf(" | caused by: %v", e.cause)
+	}
+
+	key := ""
+	if e.key {
+		key = "key for "
+	}
+
+	return fmt.Sprintf(
+		"invalid %sHelloReply.%s: %s%s",
+		key,
+		e.field,
+		e.reason,
+		cause)
+}
+
+var _ error = HelloReplyValidationError{}
+
+var _ interface {
+	Field() string
+	Reason() string
+	Key() bool
+	Cause() error
+	ErrorName() string
+} = HelloReplyValidationError{}
+
+// Validate checks the field values on HelloStreamRequest with the rules
+// defined in the proto definition for this message. If any rules are
+// violated, an error is returned. When asked to return all errors, validation
+// continues after first violation, and the result is a list of violation
+// errors wrapped in HelloStreamRequestMultiError, or nil if none found.
+// Otherwise, only the first error is returned, if any.
+func (m *HelloStreamRequest) Validate(all bool) error {
+	if m == nil {
+		return nil
+	}
+
+	var errors []error
+
+	// no validation rules for Name
+
+	// no validation rules for Count
+
+	if len(errors) > 0 {
+		return HelloStreamRequestMultiError(errors)
+	}
+	return nil
+}
+
+// HelloStreamRequestMultiError is an error wrapping multiple validation errors
+// returned by HelloStreamRequest.Validate(true) if the designated constraints
+// aren't met.
+type HelloStreamRequestMultiError []error
+
+// Error returns a concatenation of all the error messages it wraps.
+func (m HelloStreamRequestMultiError) Error() string {
+	var msgs []string
+	for _, err := range m {
+		msgs = append(msgs, err.Error())
+	}
+	return strings.Join(msgs, "; ")
+}
+
+// AllErrors returns a list of validation violation errors.
+func (m HelloStreamRequestMultiError) AllErrors() []error { return m }
+
+// HelloStreamRequestValidationError is the validation error returned by
+// HelloStreamRequest.Validate if the designated constraints aren't met.
+type HelloStreamRequestValidationError struct {
+	field  string
+	reason string
+	cause  error
+	key    bool
+}
+
+// Field function returns field value.
+func (e HelloStreamRequestValidationError) Field() string { return e.field }
+
+// Reason function returns reason value.
+func (e HelloStreamRequestValidationError) Reason() string { return e.reason }
+
+// Cause function returns cause value.
+func (e HelloStreamRequestValidationError) Cause() error { return e.cause }
+
+// Key function returns key value.
+func (e HelloStreamRequestValidationError) Key() bool { return e.key }
+
+// ErrorName returns error name.
+func (e HelloStreamRequestValidationError) ErrorName() string {
+	return "HelloStreamRequestValidationError"
+}
+
+// Error satisfies the builtin error interface
+func (e HelloStreamRequestValidationError) Error() string {
+	cause := ""
+	if e.cause != nil {
+		cause = fmt.Sprintf(" | caused by: %v", e.cause)
+	}
+
+	key := ""
+	if e.key {
+		key = "key for "
+	}
+
+	return fmt.Sprintf(
+		"invalid %sHelloStreamRequest.%s: %s%s",
+		key,
+		e.field,
+		e.reason,
+		cause)
+}
+
+var _ error = HelloStreamRequestValidationError{}
+
+var _ interface {
+	Field() string
+	Reason() string
+	Key() bool
+	Cause() error
+	ErrorName() string
+} = HelloStreamRequestValidationError{}

example/example.proto

@@ -2,10 +2,17 @@ syntax = "proto3";
 
 package helloworld;
 
-option go_package = "example;main";
+option go_package = "go.linka.cloud/grpc/example;main";
+
+import "google/api/annotations.proto";
 
 service Greeter {
-    rpc SayHello (HelloRequest) returns (HelloReply) {}
+    rpc SayHello (HelloRequest) returns (HelloReply) {
+        option (google.api.http) = {
+            post: "/api/v1/greeter/hello"
+            body: "*"
+        };
+    }
     rpc SayHelloStream (HelloStreamRequest) returns (stream HelloReply) {}
 }
 

example/example.swagger.json

@@ -0,0 +1,97 @@
+{
+  "swagger": "2.0",
+  "info": {
+    "title": "example/example.proto",
+    "version": "version not set"
+  },
+  "tags": [
+    {
+      "name": "Greeter"
+    }
+  ],
+  "consumes": [
+    "application/json"
+  ],
+  "produces": [
+    "application/json"
+  ],
+  "paths": {
+    "/api/v1/greeter/hello": {
+      "post": {
+        "operationId": "Greeter_SayHello",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/helloworldHelloReply"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/helloworldHelloRequest"
+            }
+          }
+        ],
+        "tags": [
+          "Greeter"
+        ]
+      }
+    }
+  },
+  "definitions": {
+    "helloworldHelloReply": {
+      "type": "object",
+      "properties": {
+        "message": {
+          "type": "string"
+        }
+      }
+    },
+    "helloworldHelloRequest": {
+      "type": "object",
+      "properties": {
+        "name": {
+          "type": "string"
+        }
+      }
+    },
+    "protobufAny": {
+      "type": "object",
+      "properties": {
+        "@type": {
+          "type": "string"
+        }
+      },
+      "additionalProperties": {}
+    },
+    "rpcStatus": {
+      "type": "object",
+      "properties": {
+        "code": {
+          "type": "integer",
+          "format": "int32"
+        },
+        "message": {
+          "type": "string"
+        },
+        "details": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/protobufAny"
+          }
+        }
+      }
+    }
+  }
+}

example/example_grpc.pb.go

@@ -4,6 +4,7 @@ package main
 
 import (
 	context "context"
+
 	grpc "google.golang.org/grpc"
 	codes "google.golang.org/grpc/codes"
 	status "google.golang.org/grpc/status"
@@ -11,6 +12,7 @@ import (
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
 // GreeterClient is the client API for Greeter service.
@@ -39,7 +41,7 @@ func (c *greeterClient) SayHello(ctx context.Context, in *HelloRequest, opts ...
 }
 
 func (c *greeterClient) SayHelloStream(ctx context.Context, in *HelloStreamRequest, opts ...grpc.CallOption) (Greeter_SayHelloStreamClient, error) {
-	stream, err := c.cc.NewStream(ctx, &_Greeter_serviceDesc.Streams[0], "/helloworld.Greeter/SayHelloStream", opts...)
+	stream, err := c.cc.NewStream(ctx, &Greeter_ServiceDesc.Streams[0], "/helloworld.Greeter/SayHelloStream", opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -99,7 +101,7 @@ type UnsafeGreeterServer interface {
 }
 
 func RegisterGreeterServer(s grpc.ServiceRegistrar, srv GreeterServer) {
-	s.RegisterService(&_Greeter_serviceDesc, srv)
+	s.RegisterService(&Greeter_ServiceDesc, srv)
 }
 
 func _Greeter_SayHello_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
@@ -141,7 +143,10 @@ func (x *greeterSayHelloStreamServer) Send(m *HelloReply) error {
 	return x.ServerStream.SendMsg(m)
 }
 
-var _Greeter_serviceDesc = grpc.ServiceDesc{
+// Greeter_ServiceDesc is the grpc.ServiceDesc for Greeter service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var Greeter_ServiceDesc = grpc.ServiceDesc{
 	ServiceName: "helloworld.Greeter",
 	HandlerType: (*GreeterServer)(nil),
 	Methods: []grpc.MethodDesc{

example/example_vtproto.pb.go

@@ -0,0 +1,566 @@
+// Code generated by protoc-gen-go-vtproto. DO NOT EDIT.
+// protoc-gen-go-vtproto version: v0.2.0
+// source: example/example.proto
+
+package main
+
+import (
+	fmt "fmt"
+	io "io"
+	bits "math/bits"
+
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+)
+
+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)
+)
+
+func (m *HelloRequest) MarshalVT() (dAtA []byte, err error) {
+	if m == nil {
+		return nil, nil
+	}
+	size := m.SizeVT()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBufferVT(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *HelloRequest) MarshalToVT(dAtA []byte) (int, error) {
+	size := m.SizeVT()
+	return m.MarshalToSizedBufferVT(dAtA[:size])
+}
+
+func (m *HelloRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
+	if m == nil {
+		return 0, nil
+	}
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.unknownFields != nil {
+		i -= len(m.unknownFields)
+		copy(dAtA[i:], m.unknownFields)
+	}
+	if len(m.Name) > 0 {
+		i -= len(m.Name)
+		copy(dAtA[i:], m.Name)
+		i = encodeVarint(dAtA, i, uint64(len(m.Name)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
+func (m *HelloReply) MarshalVT() (dAtA []byte, err error) {
+	if m == nil {
+		return nil, nil
+	}
+	size := m.SizeVT()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBufferVT(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *HelloReply) MarshalToVT(dAtA []byte) (int, error) {
+	size := m.SizeVT()
+	return m.MarshalToSizedBufferVT(dAtA[:size])
+}
+
+func (m *HelloReply) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
+	if m == nil {
+		return 0, nil
+	}
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.unknownFields != nil {
+		i -= len(m.unknownFields)
+		copy(dAtA[i:], m.unknownFields)
+	}
+	if len(m.Message) > 0 {
+		i -= len(m.Message)
+		copy(dAtA[i:], m.Message)
+		i = encodeVarint(dAtA, i, uint64(len(m.Message)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
+func (m *HelloStreamRequest) MarshalVT() (dAtA []byte, err error) {
+	if m == nil {
+		return nil, nil
+	}
+	size := m.SizeVT()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBufferVT(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *HelloStreamRequest) MarshalToVT(dAtA []byte) (int, error) {
+	size := m.SizeVT()
+	return m.MarshalToSizedBufferVT(dAtA[:size])
+}
+
+func (m *HelloStreamRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
+	if m == nil {
+		return 0, nil
+	}
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.unknownFields != nil {
+		i -= len(m.unknownFields)
+		copy(dAtA[i:], m.unknownFields)
+	}
+	if m.Count != 0 {
+		i = encodeVarint(dAtA, i, uint64(m.Count))
+		i--
+		dAtA[i] = 0x10
+	}
+	if len(m.Name) > 0 {
+		i -= len(m.Name)
+		copy(dAtA[i:], m.Name)
+		i = encodeVarint(dAtA, i, uint64(len(m.Name)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
+func encodeVarint(dAtA []byte, offset int, v uint64) int {
+	offset -= sov(v)
+	base := offset
+	for v >= 1<<7 {
+		dAtA[offset] = uint8(v&0x7f | 0x80)
+		v >>= 7
+		offset++
+	}
+	dAtA[offset] = uint8(v)
+	return base
+}
+func (m *HelloRequest) SizeVT() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Name)
+	if l > 0 {
+		n += 1 + l + sov(uint64(l))
+	}
+	if m.unknownFields != nil {
+		n += len(m.unknownFields)
+	}
+	return n
+}
+
+func (m *HelloReply) SizeVT() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Message)
+	if l > 0 {
+		n += 1 + l + sov(uint64(l))
+	}
+	if m.unknownFields != nil {
+		n += len(m.unknownFields)
+	}
+	return n
+}
+
+func (m *HelloStreamRequest) SizeVT() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Name)
+	if l > 0 {
+		n += 1 + l + sov(uint64(l))
+	}
+	if m.Count != 0 {
+		n += 1 + sov(uint64(m.Count))
+	}
+	if m.unknownFields != nil {
+		n += len(m.unknownFields)
+	}
+	return n
+}
+
+func sov(x uint64) (n int) {
+	return (bits.Len64(x|1) + 6) / 7
+}
+func soz(x uint64) (n int) {
+	return sov(uint64((x << 1) ^ uint64((int64(x) >> 63))))
+}
+func (m *HelloRequest) UnmarshalVT(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 ErrIntOverflow
+			}
+			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: HelloRequest: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: HelloRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Name", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLength
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLength
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Name = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skip(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLength
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.unknownFields = append(m.unknownFields, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *HelloReply) UnmarshalVT(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 ErrIntOverflow
+			}
+			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: HelloReply: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: HelloReply: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Message", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLength
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLength
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Message = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skip(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLength
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.unknownFields = append(m.unknownFields, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *HelloStreamRequest) UnmarshalVT(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 ErrIntOverflow
+			}
+			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: HelloStreamRequest: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: HelloStreamRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Name", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLength
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLength
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Name = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Count", wireType)
+			}
+			m.Count = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Count |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skip(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLength
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.unknownFields = append(m.unknownFields, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func skip(dAtA []byte) (n int, err error) {
+	l := len(dAtA)
+	iNdEx := 0
+	depth := 0
+	for iNdEx < l {
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return 0, ErrIntOverflow
+			}
+			if iNdEx >= l {
+				return 0, io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		wireType := int(wire & 0x7)
+		switch wireType {
+		case 0:
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				iNdEx++
+				if dAtA[iNdEx-1] < 0x80 {
+					break
+				}
+			}
+		case 1:
+			iNdEx += 8
+		case 2:
+			var length int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				length |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if length < 0 {
+				return 0, ErrInvalidLength
+			}
+			iNdEx += length
+		case 3:
+			depth++
+		case 4:
+			if depth == 0 {
+				return 0, ErrUnexpectedEndOfGroup
+			}
+			depth--
+		case 5:
+			iNdEx += 4
+		default:
+			return 0, fmt.Errorf("proto: illegal wireType %d", wireType)
+		}
+		if iNdEx < 0 {
+			return 0, ErrInvalidLength
+		}
+		if depth == 0 {
+			return iNdEx, nil
+		}
+	}
+	return 0, io.ErrUnexpectedEOF
+}
+
+var (
+	ErrInvalidLength        = fmt.Errorf("proto: negative length found during unmarshaling")
+	ErrIntOverflow          = fmt.Errorf("proto: integer overflow")
+	ErrUnexpectedEndOfGroup = fmt.Errorf("proto: unexpected end of group")
+)

go.mod

@@ -3,21 +3,33 @@ module go.linka.cloud/grpc
 go 1.13
 
 require (
+	github.com/alta/protopatch v0.3.4
+	github.com/envoyproxy/protoc-gen-validate v0.6.0
 	github.com/fullstorydev/grpchan v1.0.2-0.20201120232431-d0ab778aeebd
 	github.com/golang/protobuf v1.5.2
 	github.com/google/uuid v1.1.2
 	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.5.0
+	github.com/iancoleman/strcase v0.2.0 // indirect
+	github.com/improbable-eng/grpc-web v0.14.1
 	github.com/jinzhu/gorm v1.9.12
+	github.com/lyft/protoc-gen-star v0.6.0 // indirect
 	github.com/miekg/dns v1.1.35
+	github.com/planetscale/vtprotobuf v0.2.0
 	github.com/sirupsen/logrus v1.8.1
+	github.com/soheilhy/cmux v0.1.5
 	github.com/spf13/cobra v1.0.0
 	github.com/spf13/viper v1.6.2
 	github.com/stretchr/testify v1.7.0
+	go.linka.cloud/protoc-gen-defaults v0.1.0
+	go.linka.cloud/protoc-gen-go-fields v0.1.1
+	go.linka.cloud/protofilters v0.2.2
 	go.uber.org/multierr v1.7.0
-	golang.org/x/net v0.0.0-20201110031124-69a78807bb2b
+	golang.org/x/net v0.0.0-20210525063256-abc453219eb5
-	golang.org/x/sys v0.0.0-20201126233918-771906719818 // indirect
+	google.golang.org/genproto v0.0.0-20210916144049-3192f974c780
-	golang.org/x/text v0.3.4 // indirect
+	google.golang.org/grpc v1.40.0
-	google.golang.org/genproto v0.0.0-20201119123407-9b1e624d6bc4
+	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0
-	google.golang.org/grpc v1.33.2
+	google.golang.org/protobuf v1.27.1
-	google.golang.org/protobuf v1.26.0
 )
+
+replace github.com/grpc-ecosystem/grpc-gateway/v2 => github.com/linka-cloud/grpc-gateway/v2 v2.5.1-0.20210917084803-33b6d54c9e11

google/api/annotations.proto

@@ -0,0 +1,31 @@
+// Copyright 2015 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.api;
+
+import "google/api/http.proto";
+import "google/protobuf/descriptor.proto";
+
+option go_package = "google.golang.org/genproto/googleapis/api/annotations;annotations";
+option java_multiple_files = true;
+option java_outer_classname = "AnnotationsProto";
+option java_package = "com.google.api";
+option objc_class_prefix = "GAPI";
+
+extend google.protobuf.MethodOptions {
+  // See `HttpRule`.
+  HttpRule http = 72295728;
+}

google/api/field_behavior.proto

@@ -0,0 +1,90 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.api;
+
+import "google/protobuf/descriptor.proto";
+
+option go_package = "google.golang.org/genproto/googleapis/api/annotations;annotations";
+option java_multiple_files = true;
+option java_outer_classname = "FieldBehaviorProto";
+option java_package = "com.google.api";
+option objc_class_prefix = "GAPI";
+
+extend google.protobuf.FieldOptions {
+  // A designation of a specific field behavior (required, output only, etc.)
+  // in protobuf messages.
+  //
+  // Examples:
+  //
+  //   string name = 1 [(google.api.field_behavior) = REQUIRED];
+  //   State state = 1 [(google.api.field_behavior) = OUTPUT_ONLY];
+  //   google.protobuf.Duration ttl = 1
+  //     [(google.api.field_behavior) = INPUT_ONLY];
+  //   google.protobuf.Timestamp expire_time = 1
+  //     [(google.api.field_behavior) = OUTPUT_ONLY,
+  //      (google.api.field_behavior) = IMMUTABLE];
+  repeated google.api.FieldBehavior field_behavior = 1052;
+}
+
+// An indicator of the behavior of a given field (for example, that a field
+// is required in requests, or given as output but ignored as input).
+// This **does not** change the behavior in protocol buffers itself; it only
+// denotes the behavior and may affect how API tooling handles the field.
+//
+// Note: This enum **may** receive new values in the future.
+enum FieldBehavior {
+  // Conventional default for enums. Do not use this.
+  FIELD_BEHAVIOR_UNSPECIFIED = 0;
+
+  // Specifically denotes a field as optional.
+  // While all fields in protocol buffers are optional, this may be specified
+  // for emphasis if appropriate.
+  OPTIONAL = 1;
+
+  // Denotes a field as required.
+  // This indicates that the field **must** be provided as part of the request,
+  // and failure to do so will cause an error (usually `INVALID_ARGUMENT`).
+  REQUIRED = 2;
+
+  // Denotes a field as output only.
+  // This indicates that the field is provided in responses, but including the
+  // field in a request does nothing (the server *must* ignore it and
+  // *must not* throw an error as a result of the field's presence).
+  OUTPUT_ONLY = 3;
+
+  // Denotes a field as input only.
+  // This indicates that the field is provided in requests, and the
+  // corresponding field is not included in output.
+  INPUT_ONLY = 4;
+
+  // Denotes a field as immutable.
+  // This indicates that the field may be set once in a request to create a
+  // resource, but may not be changed thereafter.
+  IMMUTABLE = 5;
+
+  // Denotes that a (repeated) field is an unordered list.
+  // This indicates that the service may provide the elements of the list
+  // in any arbitrary  order, rather than the order the user originally
+  // provided. Additionally, the list's order may or may not be stable.
+  UNORDERED_LIST = 6;
+
+  // Denotes that this field returns a non-empty default value if not set.
+  // This indicates that if the user provides the empty value in a request,
+  // a non-empty value will be returned. The user will not be aware of what
+  // non-empty value to expect.
+  NON_EMPTY_DEFAULT = 7;
+}

google/api/http.proto

@@ -0,0 +1,375 @@
+// Copyright 2015 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.api;
+
+option cc_enable_arenas = true;
+option go_package = "google.golang.org/genproto/googleapis/api/annotations;annotations";
+option java_multiple_files = true;
+option java_outer_classname = "HttpProto";
+option java_package = "com.google.api";
+option objc_class_prefix = "GAPI";
+
+// Defines the HTTP configuration for an API service. It contains a list of
+// [HttpRule][google.api.HttpRule], each specifying the mapping of an RPC method
+// to one or more HTTP REST API methods.
+message Http {
+  // A list of HTTP configuration rules that apply to individual API methods.
+  //
+  // **NOTE:** All service configuration rules follow "last one wins" order.
+  repeated HttpRule rules = 1;
+
+  // When set to true, URL path parameters will be fully URI-decoded except in
+  // cases of single segment matches in reserved expansion, where "%2F" will be
+  // left encoded.
+  //
+  // The default behavior is to not decode RFC 6570 reserved characters in multi
+  // segment matches.
+  bool fully_decode_reserved_expansion = 2;
+}
+
+// # gRPC Transcoding
+//
+// gRPC Transcoding is a feature for mapping between a gRPC method and one or
+// more HTTP REST endpoints. It allows developers to build a single API service
+// that supports both gRPC APIs and REST APIs. Many systems, including [Google
+// APIs](https://github.com/googleapis/googleapis),
+// [Cloud Endpoints](https://cloud.google.com/endpoints), [gRPC
+// Gateway](https://github.com/grpc-ecosystem/grpc-gateway),
+// and [Envoy](https://github.com/envoyproxy/envoy) proxy support this feature
+// and use it for large scale production services.
+//
+// `HttpRule` defines the schema of the gRPC/REST mapping. The mapping specifies
+// how different portions of the gRPC request message are mapped to the URL
+// path, URL query parameters, and HTTP request body. It also controls how the
+// gRPC response message is mapped to the HTTP response body. `HttpRule` is
+// typically specified as an `google.api.http` annotation on the gRPC method.
+//
+// Each mapping specifies a URL path template and an HTTP method. The path
+// template may refer to one or more fields in the gRPC request message, as long
+// as each field is a non-repeated field with a primitive (non-message) type.
+// The path template controls how fields of the request message are mapped to
+// the URL path.
+//
+// Example:
+//
+//     service Messaging {
+//       rpc GetMessage(GetMessageRequest) returns (Message) {
+//         option (google.api.http) = {
+//             get: "/v1/{name=messages/*}"
+//         };
+//       }
+//     }
+//     message GetMessageRequest {
+//       string name = 1; // Mapped to URL path.
+//     }
+//     message Message {
+//       string text = 1; // The resource content.
+//     }
+//
+// This enables an HTTP REST to gRPC mapping as below:
+//
+// HTTP | gRPC
+// -----|-----
+// `GET /v1/messages/123456`  | `GetMessage(name: "messages/123456")`
+//
+// Any fields in the request message which are not bound by the path template
+// automatically become HTTP query parameters if there is no HTTP request body.
+// For example:
+//
+//     service Messaging {
+//       rpc GetMessage(GetMessageRequest) returns (Message) {
+//         option (google.api.http) = {
+//             get:"/v1/messages/{message_id}"
+//         };
+//       }
+//     }
+//     message GetMessageRequest {
+//       message SubMessage {
+//         string subfield = 1;
+//       }
+//       string message_id = 1; // Mapped to URL path.
+//       int64 revision = 2;    // Mapped to URL query parameter `revision`.
+//       SubMessage sub = 3;    // Mapped to URL query parameter `sub.subfield`.
+//     }
+//
+// This enables a HTTP JSON to RPC mapping as below:
+//
+// HTTP | gRPC
+// -----|-----
+// `GET /v1/messages/123456?revision=2&sub.subfield=foo` |
+// `GetMessage(message_id: "123456" revision: 2 sub: SubMessage(subfield:
+// "foo"))`
+//
+// Note that fields which are mapped to URL query parameters must have a
+// primitive type or a repeated primitive type or a non-repeated message type.
+// In the case of a repeated type, the parameter can be repeated in the URL
+// as `...?param=A&param=B`. In the case of a message type, each field of the
+// message is mapped to a separate parameter, such as
+// `...?foo.a=A&foo.b=B&foo.c=C`.
+//
+// For HTTP methods that allow a request body, the `body` field
+// specifies the mapping. Consider a REST update method on the
+// message resource collection:
+//
+//     service Messaging {
+//       rpc UpdateMessage(UpdateMessageRequest) returns (Message) {
+//         option (google.api.http) = {
+//           patch: "/v1/messages/{message_id}"
+//           body: "message"
+//         };
+//       }
+//     }
+//     message UpdateMessageRequest {
+//       string message_id = 1; // mapped to the URL
+//       Message message = 2;   // mapped to the body
+//     }
+//
+// The following HTTP JSON to RPC mapping is enabled, where the
+// representation of the JSON in the request body is determined by
+// protos JSON encoding:
+//
+// HTTP | gRPC
+// -----|-----
+// `PATCH /v1/messages/123456 { "text": "Hi!" }` | `UpdateMessage(message_id:
+// "123456" message { text: "Hi!" })`
+//
+// The special name `*` can be used in the body mapping to define that
+// every field not bound by the path template should be mapped to the
+// request body.  This enables the following alternative definition of
+// the update method:
+//
+//     service Messaging {
+//       rpc UpdateMessage(Message) returns (Message) {
+//         option (google.api.http) = {
+//           patch: "/v1/messages/{message_id}"
+//           body: "*"
+//         };
+//       }
+//     }
+//     message Message {
+//       string message_id = 1;
+//       string text = 2;
+//     }
+//
+//
+// The following HTTP JSON to RPC mapping is enabled:
+//
+// HTTP | gRPC
+// -----|-----
+// `PATCH /v1/messages/123456 { "text": "Hi!" }` | `UpdateMessage(message_id:
+// "123456" text: "Hi!")`
+//
+// Note that when using `*` in the body mapping, it is not possible to
+// have HTTP parameters, as all fields not bound by the path end in
+// the body. This makes this option more rarely used in practice when
+// defining REST APIs. The common usage of `*` is in custom methods
+// which don't use the URL at all for transferring data.
+//
+// It is possible to define multiple HTTP methods for one RPC by using
+// the `additional_bindings` option. Example:
+//
+//     service Messaging {
+//       rpc GetMessage(GetMessageRequest) returns (Message) {
+//         option (google.api.http) = {
+//           get: "/v1/messages/{message_id}"
+//           additional_bindings {
+//             get: "/v1/users/{user_id}/messages/{message_id}"
+//           }
+//         };
+//       }
+//     }
+//     message GetMessageRequest {
+//       string message_id = 1;
+//       string user_id = 2;
+//     }
+//
+// This enables the following two alternative HTTP JSON to RPC mappings:
+//
+// HTTP | gRPC
+// -----|-----
+// `GET /v1/messages/123456` | `GetMessage(message_id: "123456")`
+// `GET /v1/users/me/messages/123456` | `GetMessage(user_id: "me" message_id:
+// "123456")`
+//
+// ## Rules for HTTP mapping
+//
+// 1. Leaf request fields (recursive expansion nested messages in the request
+//    message) are classified into three categories:
+//    - Fields referred by the path template. They are passed via the URL path.
+//    - Fields referred by the [HttpRule.body][google.api.HttpRule.body]. They are passed via the HTTP
+//      request body.
+//    - All other fields are passed via the URL query parameters, and the
+//      parameter name is the field path in the request message. A repeated
+//      field can be represented as multiple query parameters under the same
+//      name.
+//  2. If [HttpRule.body][google.api.HttpRule.body] is "*", there is no URL query parameter, all fields
+//     are passed via URL path and HTTP request body.
+//  3. If [HttpRule.body][google.api.HttpRule.body] is omitted, there is no HTTP request body, all
+//     fields are passed via URL path and URL query parameters.
+//
+// ### Path template syntax
+//
+//     Template = "/" Segments [ Verb ] ;
+//     Segments = Segment { "/" Segment } ;
+//     Segment  = "*" | "**" | LITERAL | Variable ;
+//     Variable = "{" FieldPath [ "=" Segments ] "}" ;
+//     FieldPath = IDENT { "." IDENT } ;
+//     Verb     = ":" LITERAL ;
+//
+// The syntax `*` matches a single URL path segment. The syntax `**` matches
+// zero or more URL path segments, which must be the last part of the URL path
+// except the `Verb`.
+//
+// The syntax `Variable` matches part of the URL path as specified by its
+// template. A variable template must not contain other variables. If a variable
+// matches a single path segment, its template may be omitted, e.g. `{var}`
+// is equivalent to `{var=*}`.
+//
+// The syntax `LITERAL` matches literal text in the URL path. If the `LITERAL`
+// contains any reserved character, such characters should be percent-encoded
+// before the matching.
+//
+// If a variable contains exactly one path segment, such as `"{var}"` or
+// `"{var=*}"`, when such a variable is expanded into a URL path on the client
+// side, all characters except `[-_.~0-9a-zA-Z]` are percent-encoded. The
+// server side does the reverse decoding. Such variables show up in the
+// [Discovery
+// Document](https://developers.google.com/discovery/v1/reference/apis) as
+// `{var}`.
+//
+// If a variable contains multiple path segments, such as `"{var=foo/*}"`
+// or `"{var=**}"`, when such a variable is expanded into a URL path on the
+// client side, all characters except `[-_.~/0-9a-zA-Z]` are percent-encoded.
+// The server side does the reverse decoding, except "%2F" and "%2f" are left
+// unchanged. Such variables show up in the
+// [Discovery
+// Document](https://developers.google.com/discovery/v1/reference/apis) as
+// `{+var}`.
+//
+// ## Using gRPC API Service Configuration
+//
+// gRPC API Service Configuration (service config) is a configuration language
+// for configuring a gRPC service to become a user-facing product. The
+// service config is simply the YAML representation of the `google.api.Service`
+// proto message.
+//
+// As an alternative to annotating your proto file, you can configure gRPC
+// transcoding in your service config YAML files. You do this by specifying a
+// `HttpRule` that maps the gRPC method to a REST endpoint, achieving the same
+// effect as the proto annotation. This can be particularly useful if you
+// have a proto that is reused in multiple services. Note that any transcoding
+// specified in the service config will override any matching transcoding
+// configuration in the proto.
+//
+// Example:
+//
+//     http:
+//       rules:
+//         # Selects a gRPC method and applies HttpRule to it.
+//         - selector: example.v1.Messaging.GetMessage
+//           get: /v1/messages/{message_id}/{sub.subfield}
+//
+// ## Special notes
+//
+// When gRPC Transcoding is used to map a gRPC to JSON REST endpoints, the
+// proto to JSON conversion must follow the [proto3
+// specification](https://developers.google.com/protocol-buffers/docs/proto3#json).
+//
+// While the single segment variable follows the semantics of
+// [RFC 6570](https://tools.ietf.org/html/rfc6570) Section 3.2.2 Simple String
+// Expansion, the multi segment variable **does not** follow RFC 6570 Section
+// 3.2.3 Reserved Expansion. The reason is that the Reserved Expansion
+// does not expand special characters like `?` and `#`, which would lead
+// to invalid URLs. As the result, gRPC Transcoding uses a custom encoding
+// for multi segment variables.
+//
+// The path variables **must not** refer to any repeated or mapped field,
+// because client libraries are not capable of handling such variable expansion.
+//
+// The path variables **must not** capture the leading "/" character. The reason
+// is that the most common use case "{var}" does not capture the leading "/"
+// character. For consistency, all path variables must share the same behavior.
+//
+// Repeated message fields must not be mapped to URL query parameters, because
+// no client library can support such complicated mapping.
+//
+// If an API needs to use a JSON array for request or response body, it can map
+// the request or response body to a repeated field. However, some gRPC
+// Transcoding implementations may not support this feature.
+message HttpRule {
+  // Selects a method to which this rule applies.
+  //
+  // Refer to [selector][google.api.DocumentationRule.selector] for syntax details.
+  string selector = 1;
+
+  // Determines the URL pattern is matched by this rules. This pattern can be
+  // used with any of the {get|put|post|delete|patch} methods. A custom method
+  // can be defined using the 'custom' field.
+  oneof pattern {
+    // Maps to HTTP GET. Used for listing and getting information about
+    // resources.
+    string get = 2;
+
+    // Maps to HTTP PUT. Used for replacing a resource.
+    string put = 3;
+
+    // Maps to HTTP POST. Used for creating a resource or performing an action.
+    string post = 4;
+
+    // Maps to HTTP DELETE. Used for deleting a resource.
+    string delete = 5;
+
+    // Maps to HTTP PATCH. Used for updating a resource.
+    string patch = 6;
+
+    // The custom pattern is used for specifying an HTTP method that is not
+    // included in the `pattern` field, such as HEAD, or "*" to leave the
+    // HTTP method unspecified for this rule. The wild-card rule is useful
+    // for services that provide content to Web (HTML) clients.
+    CustomHttpPattern custom = 8;
+  }
+
+  // The name of the request field whose value is mapped to the HTTP request
+  // body, or `*` for mapping all request fields not captured by the path
+  // pattern to the HTTP body, or omitted for not having any HTTP request body.
+  //
+  // NOTE: the referred field must be present at the top-level of the request
+  // message type.
+  string body = 7;
+
+  // Optional. The name of the response field whose value is mapped to the HTTP
+  // response body. When omitted, the entire response message will be used
+  // as the HTTP response body.
+  //
+  // NOTE: The referred field must be present at the top-level of the response
+  // message type.
+  string response_body = 12;
+
+  // Additional HTTP bindings for the selector. Nested bindings must
+  // not contain an `additional_bindings` field themselves (that is,
+  // the nesting may only be one level deep).
+  repeated HttpRule additional_bindings = 11;
+}
+
+// A custom pattern is used for defining custom HTTP verb.
+message CustomHttpPattern {
+  // The name of this custom HTTP verb.
+  string kind = 1;
+
+  // The path matched by this custom verb.
+  string path = 2;
+}

google/api/httpbody.proto

@@ -0,0 +1,77 @@
+// Copyright 2015 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.api;
+
+import "google/protobuf/any.proto";
+
+option cc_enable_arenas = true;
+option go_package = "google.golang.org/genproto/googleapis/api/httpbody;httpbody";
+option java_multiple_files = true;
+option java_outer_classname = "HttpBodyProto";
+option java_package = "com.google.api";
+option objc_class_prefix = "GAPI";
+
+// Message that represents an arbitrary HTTP body. It should only be used for
+// payload formats that can't be represented as JSON, such as raw binary or
+// an HTML page.
+//
+//
+// This message can be used both in streaming and non-streaming API methods in
+// the request as well as the response.
+//
+// It can be used as a top-level request field, which is convenient if one
+// wants to extract parameters from either the URL or HTTP template into the
+// request fields and also want access to the raw HTTP body.
+//
+// Example:
+//
+//     message GetResourceRequest {
+//       // A unique request id.
+//       string request_id = 1;
+//
+//       // The raw HTTP body is bound to this field.
+//       google.api.HttpBody http_body = 2;
+//     }
+//
+//     service ResourceService {
+//       rpc GetResource(GetResourceRequest) returns (google.api.HttpBody);
+//       rpc UpdateResource(google.api.HttpBody) returns
+//       (google.protobuf.Empty);
+//     }
+//
+// Example with streaming methods:
+//
+//     service CaldavService {
+//       rpc GetCalendar(stream google.api.HttpBody)
+//         returns (stream google.api.HttpBody);
+//       rpc UpdateCalendar(stream google.api.HttpBody)
+//         returns (stream google.api.HttpBody);
+//     }
+//
+// Use of this type only changes how the request and response bodies are
+// handled, all other features will continue to work unchanged.
+message HttpBody {
+  // The HTTP Content-Type header value specifying the content type of the body.
+  string content_type = 1;
+
+  // The HTTP request/response body as raw binary.
+  bytes data = 2;
+
+  // Application specific response metadata. Must be set in the first response
+  // for streaming APIs.
+  repeated google.protobuf.Any extensions = 3;
+}

logger/context.go

@@ -42,4 +42,3 @@ func From(ctx context.Context) Logger {
 	defaultLogger = logr
 	return defaultLogger
 }
-

logger/logger.go

@@ -54,7 +54,7 @@ func (l *logger) WithField(key string, value interface{}) Logger {
 }
 
 func (l *logger) WithFields(kv ...string) Logger {
-	for i := 0; i < len(kv); i+=2 {
+	for i := 0; i < len(kv); i += 2 {
 		l.FieldLogger = l.FieldLogger.WithField(kv[i], kv[i+1])
 	}
 	return l

registry/noop/registry.go

@@ -7,12 +7,11 @@ import (
 	resolver2 "go.linka.cloud/grpc/resolver"
 )
 
-
 func New() registry.Registry {
 	return &noop{}
 }
 
-type noop struct {}
+type noop struct{}
 
 func (n noop) ResolverBuilder() resolver.Builder {
 	return resolver2.New(n)
@@ -50,11 +49,10 @@ func (n noop) String() string {
 	return "passthroug"
 }
 
-type noopWatcher struct {}
+type noopWatcher struct{}
 
 func (n noopWatcher) Next() (*registry.Result, error) {
 	return &registry.Result{}, nil
 }
 
 func (n noopWatcher) Stop() {}
-

service/gateway.go

@@ -0,0 +1,29 @@
+package service
+
+import (
+	"net/http"
+
+	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+)
+
+var defaultGatewayOptions = []runtime.ServeMuxOption{
+	runtime.WithIncomingHeaderMatcher(func(s string) (string, bool) {
+		return s, true
+	}),
+}
+
+func (s *service) gateway(opts ...runtime.ServeMuxOption) error {
+	if !s.opts.Gateway() {
+		return nil
+	}
+	mux := runtime.NewServeMux(append(defaultGatewayOptions, opts...)...)
+	if err := s.opts.gateway(s.opts.ctx, mux, s.inproc); err != nil {
+		return err
+	}
+	if s.opts.gatewayPrefix != "" {
+		s.mux.Handle(s.opts.gatewayPrefix+"/", http.StripPrefix(s.opts.gatewayPrefix, mux))
+	} else {
+		s.mux.Handle("/", mux)
+	}
+	return nil
+}

service/options.go

@@ -7,13 +7,17 @@ import (
 	"fmt"
 	"io/ioutil"
 	"net"
+	"strings"
 
+	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+	"github.com/improbable-eng/grpc-web/go/grpcweb"
 	"github.com/jinzhu/gorm"
 	"go.uber.org/multierr"
 	"google.golang.org/grpc"
 
 	"go.linka.cloud/grpc/certs"
 	"go.linka.cloud/grpc/registry"
+	"go.linka.cloud/grpc/transport"
 	"go.linka.cloud/grpc/utils/addr"
 )
 
@@ -46,29 +50,51 @@ GLOBAL OPTIONS:
 	--db_path                 DB_PATH
 */
 
+type RegisterGatewayFunc func(ctx context.Context, mux *runtime.ServeMux, cc grpc.ClientConnInterface) error
+
 type Options interface {
 	Context() context.Context
 	Name() string
 	Version() string
 	Address() string
+
 	Reflection() bool
+
 	CACert() string
 	Cert() string
 	Key() string
 	TLSConfig() *tls.Config
 	Secure() bool
+
 	Registry() registry.Registry
+
 	DB() *gorm.DB
+
 	BeforeStart() []func() error
 	AfterStart() []func() error
 	BeforeStop() []func() error
 	AfterStop() []func() error
+
 	ServerOpts() []grpc.ServerOption
 	ServerInterceptors() []grpc.UnaryServerInterceptor
 	StreamServerInterceptors() []grpc.StreamServerInterceptor
+
 	ClientInterceptors() []grpc.UnaryClientInterceptor
 	StreamClientInterceptors() []grpc.StreamClientInterceptor
-	Defaults()
+
+	// TODO(adphi): CORS for http handler
+
+	GRPCWeb() bool
+	GRPCWebPrefix() string
+	GRPCWebOpts() []grpcweb.Option
+
+	Gateway() bool
+	GatewayPrefix() string
+	GatewayOpts() []runtime.ServeMuxOption
+
+	// TODO(adphi): metrics
+
+	Default()
 }
 
 func NewOptions() *options {
@@ -78,13 +104,16 @@ func NewOptions() *options {
 	}
 }
 
-func (o *options) Defaults() {
+func (o *options) Default() {
 	if o.ctx == nil {
 		o.ctx = context.Background()
 	}
 	if o.address == "" {
 		o.address = "0.0.0.0:0"
 	}
+	if o.transport == nil {
+		o.transport = &grpc.Server{}
+	}
 }
 
 type Option func(*options)
@@ -229,19 +258,59 @@ func WithSubscriberInterceptor(w ...interface{}) Option {
 	}
 }
 
+func WithGRPCWeb(b bool) Option {
+	return func(o *options) {
+		o.grpcWeb = b
+	}
+}
+
+func WithGRPCWebPrefix(prefix string) Option {
+	return func(o *options) {
+		o.grpcWebPrefix = strings.TrimSuffix(prefix, "/")
+	}
+}
+
+func WithGRPCWebOpts(opts ...grpcweb.Option) Option {
+	return func(o *options) {
+		o.grpcWebOpts = opts
+	}
+}
+
+func WithGateway(fn RegisterGatewayFunc) Option {
+	return func(o *options) {
+		o.gateway = fn
+	}
+}
+
+func WithGatewayPrefix(prefix string) Option {
+	return func(o *options) {
+		o.gatewayPrefix = strings.TrimSuffix(prefix, "/")
+	}
+}
+
+func WithGatewayOpts(opts ...runtime.ServeMuxOption) Option {
+	return func(o *options) {
+		o.gatewayOpts = opts
+	}
+}
+
 type options struct {
 	ctx     context.Context
 	name    string
 	version string
 	address string
-	secure     bool
+
 	reflection bool
+
+	secure    bool
 	caCert    string
 	cert      string
 	key       string
 	tlsConfig *tls.Config
+
 	db *gorm.DB
 
+	transport transport.Transport
 	registry  registry.Registry
 
 	beforeStart []func() error
@@ -257,7 +326,15 @@ type options struct {
 	clientInterceptors       []grpc.UnaryClientInterceptor
 	streamClientInterceptors []grpc.StreamClientInterceptor
 
+	grpcWeb       bool
+	grpcWebOpts   []grpcweb.Option
+	grpcWebPrefix string
+
+	gateway     RegisterGatewayFunc
+	gatewayOpts []runtime.ServeMuxOption
+
 	error         error
+	gatewayPrefix string
 }
 
 func (o *options) Name() string {
@@ -344,6 +421,30 @@ func (o *options) StreamClientInterceptors() []grpc.StreamClientInterceptor {
 	return o.streamClientInterceptors
 }
 
+func (o *options) GRPCWeb() bool {
+	return o.grpcWeb
+}
+
+func (o *options) GRPCWebPrefix() string {
+	return o.grpcWebPrefix
+}
+
+func (o *options) GRPCWebOpts() []grpcweb.Option {
+	return o.grpcWebOpts
+}
+
+func (o *options) Gateway() bool {
+	return o.gateway != nil
+}
+
+func (o *options) GatewayPrefix() string {
+	return o.gatewayPrefix
+}
+
+func (o *options) GatewayOpts() []runtime.ServeMuxOption {
+	return o.gatewayOpts
+}
+
 func (o *options) parseTLSConfig() error {
 	if o.tlsConfig != nil {
 		return nil

service/register.go

@@ -0,0 +1,86 @@
+package service
+
+import (
+	"net"
+	"strings"
+	"time"
+
+	"go.linka.cloud/grpc/registry"
+	"go.linka.cloud/grpc/utils/addr"
+	"go.linka.cloud/grpc/utils/backoff"
+	net2 "go.linka.cloud/grpc/utils/net"
+)
+
+func (s *service) register() error {
+	const (
+		defaultRegisterInterval = time.Second * 30
+		defaultRegisterTTL      = time.Second * 90
+	)
+	regFunc := func(service *registry.Service) error {
+		var regErr error
+
+		for i := 0; i < 3; i++ {
+			// set the ttl
+			rOpts := []registry.RegisterOption{registry.RegisterTTL(defaultRegisterTTL)}
+			// attempt to register
+			if err := s.opts.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
+	}
+
+	var err error
+	var advt, host, port string
+
+	// // 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 = s.opts.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 = s.opts.address
+	}
+
+	addr, err := addr.Extract(host)
+	if err != nil {
+		return err
+	}
+
+	// register service
+	node := &registry.Node{
+		Id:      s.opts.name + "-" + s.id,
+		Address: net2.HostPort(addr, port),
+	}
+
+	s.regSvc = &registry.Service{
+		Name:    s.opts.name,
+		Version: s.opts.version,
+		Nodes:   []*registry.Node{node},
+	}
+
+	// register the service
+	if err := regFunc(s.regSvc); err != nil {
+		return err
+	}
+
+	return nil
+}

service/service.go

@@ -2,8 +2,10 @@ package service
 
 import (
 	"context"
+	"crypto/tls"
 	"fmt"
 	"net"
+	"net/http"
 	"os"
 	"os/signal"
 	"strings"
@@ -11,21 +13,19 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/fullstorydev/grpchan/inprocgrpc"
 	"github.com/google/uuid"
 	grpcmiddleware "github.com/grpc-ecosystem/go-grpc-middleware"
 	"github.com/jinzhu/gorm"
 	"github.com/sirupsen/logrus"
+	"github.com/soheilhy/cmux"
 	"github.com/spf13/cobra"
 	"go.uber.org/multierr"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/reflection"
 
 	"go.linka.cloud/grpc/registry"
 	"go.linka.cloud/grpc/registry/noop"
-	"go.linka.cloud/grpc/utils/addr"
-	"go.linka.cloud/grpc/utils/backoff"
-	net2 "go.linka.cloud/grpc/utils/net"
 )
 
 type Service interface {
@@ -48,11 +48,15 @@ type service struct {
 	cmd    *cobra.Command
 	opts   *options
 	cancel context.CancelFunc
+
 	server  *grpc.Server
-	list    net.Listener
 	mu      sync.Mutex
 	running bool
 
+	mux    *http.ServeMux
+	// inproc Channel is used to serve grpc gateway
+	inproc *inprocgrpc.Channel
+
 	id     string
 	regSvc *registry.Service
 	closed chan struct{}
@@ -66,6 +70,8 @@ func newService(opts ...Option) (*service, error) {
 		opts:   parseFlags(NewOptions()),
 		cmd:    cmd,
 		id:     uuid.New().String(),
+		mux:    http.NewServeMux(),
+		inproc: &inprocgrpc.Channel{},
 	}
 	s.mu.Lock()
 	defer s.mu.Unlock()
@@ -87,11 +93,7 @@ func newService(opts ...Option) (*service, error) {
 	if s.opts.registry == nil {
 		s.opts.registry = noop.New()
 	}
-	var err error
+
-	s.list, err = net.Listen("tcp", s.opts.address)
-	if err != nil {
-		return nil, err
-	}
 	if err := s.opts.parseTLSConfig(); err != nil {
 		return nil, err
 	}
@@ -102,18 +104,24 @@ func newService(opts ...Option) (*service, error) {
 		}
 		return s.run()
 	}
+	ui := grpcmiddleware.ChainUnaryServer(s.opts.serverInterceptors...)
+	s.inproc = s.inproc.WithServerUnaryInterceptor(ui)
+
+	si := grpcmiddleware.ChainStreamServer(/*TODO(adphi): add to options*/)
+	s.inproc = s.inproc.WithServerStreamInterceptor(si)
+
 	gopts := []grpc.ServerOption{
-		grpc.UnaryInterceptor(
+		grpc.StreamInterceptor(si),
-			grpcmiddleware.ChainUnaryServer(s.opts.serverInterceptors...),
+		grpc.UnaryInterceptor(ui),
-		),
-	}
-	if s.opts.tlsConfig != nil {
-		gopts = append(gopts, grpc.Creds(credentials.NewTLS(s.opts.tlsConfig)))
 	}
 	s.server = grpc.NewServer(append(gopts, s.opts.serverOpts...)...)
 	if s.opts.reflection {
 		reflection.Register(s.server)
 	}
+	if err := s.gateway(s.opts.gatewayOpts...); err != nil {
+		return nil, err
+	}
+	// we do not configure grpc web here as the grpc handlers are not yet registered
 	return s, nil
 }
 
@@ -133,99 +141,69 @@ func (s *service) Cmd() *cobra.Command {
 	return s.cmd
 }
 
-func (s *service) register() error {
-	const (
-		defaultRegisterInterval = time.Second * 30
-		defaultRegisterTTL      = time.Second * 90
-	)
-	regFunc := func(service *registry.Service) error {
-		var regErr error
-
-		for i := 0; i < 3; i++ {
-			// set the ttl
-			rOpts := []registry.RegisterOption{registry.RegisterTTL(defaultRegisterTTL)}
-			// attempt to register
-			if err := s.opts.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
-	}
-
-	var err error
-	var advt, host, port string
-
-	//// 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 = s.opts.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 = s.opts.address
-	}
-
-	addr, err := addr.Extract(host)
-	if err != nil {
-		return err
-	}
-
-	// register service
-	node := &registry.Node{
-		Id:      s.opts.name + "-" + s.id,
-		Address: net2.HostPort(addr, port),
-	}
-
-	s.regSvc = &registry.Service{
-		Name: s.opts.name,
-		Version:   s.opts.version,
-		Nodes: []*registry.Node{node},
-	}
-
-	// register the service
-	if err := regFunc(s.regSvc); err != nil {
-		return err
-	}
-
-	return nil
-}
-
 func (s *service) run() error {
 	s.mu.Lock()
 	s.closed = make(chan struct{})
+
+	// configure grpc web now that we are ready to go
+	if err := s.grpcWeb(s.opts.grpcWebOpts...); err != nil {
+		return err
+	}
+
+	lis, err := net.Listen("tcp", s.opts.address)
+	if err != nil {
+		return err
+	}
+	if s.opts.tlsConfig != nil {
+		lis = tls.NewListener(lis, s.opts.tlsConfig)
+	}
+
+	s.opts.address = lis.Addr().String()
+
+	mux := cmux.New(lis)
+	mux.SetReadTimeout(5 * time.Second)
+
+	gLis := mux.MatchWithWriters(cmux.HTTP2MatchHeaderFieldSendSettings("content-type", "application/grpc"))
+	hList := mux.Match(cmux.Any())
+
 	for i := range s.opts.beforeStart {
 		if err := s.opts.beforeStart[i](); err != nil {
 			s.mu.Unlock()
 			return err
 		}
 	}
-	s.opts.address = s.list.Addr().String()
 
 	if err := s.register(); err != nil {
 		return err
 	}
 	s.running = true
 
-	errs := make(chan error)
+	errs := make(chan error, 3)
+
+	hServer := &http.Server{
+		Handler: s.mux,
+	}
+	if s.opts.Gateway() || s.opts.grpcWeb {
 		go func() {
-		errs <- s.server.Serve(s.list)
+			errs <- hServer.Serve(hList)
+			hServer.Shutdown(s.opts.ctx)
+		}()
+	}
+	go func() {
+		errs <- s.server.Serve(gLis)
+	}()
+
+	go func() {
+		if err := mux.Serve(); err != nil {
+			// TODO(adphi): find more elegant solution
+			if ignoreMuxError(err) {
+				errs <- nil
+				return
+			}
+			errs <- err
+			return
+		}
+		errs <- nil
 	}()
 	for i := range s.opts.afterStart {
 		if err := s.opts.afterStart[i](); err != nil {
@@ -242,7 +220,7 @@ func (s *service) run() error {
 		logrus.Warnf("received %v", sig)
 		return s.Close()
 	case err := <-errs:
-		if err != nil{
+		if err != nil {
 			logrus.Error(err)
 			return err
 		}
@@ -297,6 +275,7 @@ func (s *service) Stop() error {
 
 func (s *service) RegisterService(desc *grpc.ServiceDesc, impl interface{}) {
 	s.server.RegisterService(desc, impl)
+	s.inproc.RegisterService(desc, impl)
 }
 
 func (s *service) Close() error {
@@ -313,3 +292,11 @@ func (s *service) notify() <-chan os.Signal {
 	signal.Notify(sigs, syscall.SIGINT, syscall.SIGQUIT)
 	return sigs
 }
+
+func ignoreMuxError(err error) bool {
+	if err == nil {
+		return true
+	}
+	return strings.Contains(err.Error(), "use of closed network connection") ||
+		strings.Contains(err.Error(), "mux: server closed")
+}

service/web.go

@@ -0,0 +1,35 @@
+package service
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/improbable-eng/grpc-web/go/grpcweb"
+)
+
+var defaultWebOptions = []grpcweb.Option{
+	grpcweb.WithWebsockets(true),
+	grpcweb.WithWebsocketOriginFunc(func(req *http.Request) bool {
+		return true
+	}),
+	grpcweb.WithCorsForRegisteredEndpointsOnly(false),
+	grpcweb.WithOriginFunc(func(origin string) bool {
+		return true
+	}),
+	grpcweb.WithWebsocketPingInterval(time.Second),
+}
+
+func (s *service) grpcWeb(opts ...grpcweb.Option) error {
+	if !s.opts.grpcWeb {
+		return nil
+	}
+	h := grpcweb.WrapServer(s.server, opts...)
+	for _, v := range grpcweb.ListGRPCResources(s.server) {
+		if s.opts.grpcWebPrefix != "" {
+			s.mux.Handle(s.opts.grpcWebPrefix+v, http.StripPrefix(s.opts.grpcWebPrefix, h))
+		} else {
+			s.mux.Handle(v, h)
+		}
+	}
+	return nil
+}

tools.go

@@ -0,0 +1,31 @@
+//go:build tools
+// +build tools
+
+// Copyright 2021 Linka Cloud  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	_ "github.com/alta/protopatch/cmd/protoc-gen-go-patch"
+	_ "github.com/envoyproxy/protoc-gen-validate"
+	_ "github.com/golang/protobuf/protoc-gen-go"
+	_ "github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway"
+	_ "github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2"
+	_ "github.com/planetscale/vtprotobuf/cmd/protoc-gen-go-vtproto"
+	_ "go.linka.cloud/protoc-gen-defaults"
+	_ "go.linka.cloud/protoc-gen-go-fields"
+	_ "go.linka.cloud/protofilters"
+	_ "google.golang.org/grpc/cmd/protoc-gen-go-grpc"
+)

transport/grpc/grpc.go

@@ -1,10 +0,0 @@
-package grpc
-
-import (
-	"go.linka.cloud/grpc/transport"
-	"google.golang.org/grpc"
-)
-
-var (
-	_ transport.Transport = &grpc.Server{}
-)

transport/inproc/inproc.go

@@ -1,52 +0,0 @@
-package inproc
-
-import (
-	"errors"
-	"net"
-	"sync"
-
-	"github.com/fullstorydev/grpchan/inprocgrpc"
-	"go.linka.cloud/grpc/transport"
-)
-
-var (
-	_ transport.Transport = &InProc{}
-)
-
-func New() transport.Transport {
-	return &InProc{stop: make(chan struct{})}
-}
-
-type InProc struct {
-	inprocgrpc.Channel
-	stop chan struct{}
-	running bool
-	mu sync.RWMutex
-}
-
-func (i *InProc) Serve(lis net.Listener) error {
-	i.mu.RLock()
-	running := i.running
-	i.mu.RUnlock()
-	if running {
-		return errors.New("already running")
-	}
-	i.mu.Lock()
-	i.running = true
-	i.mu.Unlock()
-	<-i.stop
-	return nil
-}
-
-func (i *InProc) Stop() {
-	i.mu.RLock()
-	running := i.running
-	i.mu.RUnlock()
-	if running {
-		i.stop <- struct{}{}
-	}
-}
-
-func (i *InProc) GracefulStop() {
-	i.Stop()
-}

transport/transport.go

@@ -1,15 +0,0 @@
-package transport
-
-import (
-	"net"
-
-	"google.golang.org/grpc"
-)
-
-type Transport interface {
-	grpc.ServiceRegistrar
-	RegisterService(sd *grpc.ServiceDesc, ss interface{})
-	Serve(lis net.Listener) error
-	Stop()
-	GracefulStop()
-}