feat: support grpc json protocol

protocol/grpc/client.go

@@ -25,15 +25,64 @@ import (
 	"github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc"
 	"github.com/opentracing/opentracing-go"
 	"google.golang.org/grpc"
+	"gopkg.in/yaml.v2"
 )
 
 import (
 	"github.com/apache/dubbo-go/common"
 	"github.com/apache/dubbo-go/common/constant"
+	"github.com/apache/dubbo-go/common/logger"
 	"github.com/apache/dubbo-go/config"
 )
 
-// Client ...
+var (
+	clientConf *ClientConfig
+)
+
+func init() {
+	// load clientconfig from consumer_config
+	consumerConfig := config.GetConsumerConfig()
+
+	clientConfig := GetClientConfig()
+	clientConf = &clientConfig
+
+	// check client config and decide whether to use the default config
+	defer func() {
+		if clientConf == nil || len(clientConf.ContentSubType) == 0 {
+			defaultClientConfig := GetDefaultClientConfig()
+			clientConf = &defaultClientConfig
+		}
+		if err := clientConf.Validate(); err != nil {
+			panic(err)
+		}
+	}()
+
+	if consumerConfig.ApplicationConfig == nil {
+		return
+	}
+	protocolConf := config.GetConsumerConfig().ProtocolConf
+
+	if protocolConf == nil {
+		logger.Info("protocol_conf default use dubbo config")
+	} else {
+		grpcConf := protocolConf.(map[interface{}]interface{})[GRPC]
+		if grpcConf == nil {
+			logger.Warnf("grpcConf is nil")
+			return
+		}
+		grpcConfByte, err := yaml.Marshal(grpcConf)
+		if err != nil {
+			panic(err)
+		}
+		err = yaml.Unmarshal(grpcConfByte, clientConf)
+		if err != nil {
+			panic(err)
+		}
+	}
+
+}
+
+// Client return grpc connection and warp service stub
 type Client struct {
 	*grpc.ClientConn
 	invoker reflect.Value
@@ -43,9 +92,11 @@ type Client struct {
 func NewClient(url common.URL) *Client {
 	// if global trace instance was set , it means trace function enabled. If not , will return Nooptracer
 	tracer := opentracing.GlobalTracer()
-	conn, err := grpc.Dial(url.Location, grpc.WithInsecure(), grpc.WithBlock(),
-		grpc.WithUnaryInterceptor(
-			otgrpc.OpenTracingClientInterceptor(tracer, otgrpc.LogPayloads())))
+	dailOpts := make([]grpc.DialOption, 0, 4)
+	dailOpts = append(dailOpts, grpc.WithInsecure(), grpc.WithBlock(), grpc.WithUnaryInterceptor(
+		otgrpc.OpenTracingClientInterceptor(tracer, otgrpc.LogPayloads())),
+		grpc.WithDefaultCallOptions(grpc.CallContentSubtype(clientConf.ContentSubType)))
+	conn, err := grpc.Dial(url.Location, dailOpts...)
 	if err != nil {
 		panic(err)
 	}

protocol/grpc/codec.go

@@ -0,0 +1,76 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 grpc
+
+import (
+	"bytes"
+	"encoding/json"
+)
+
+import (
+	"github.com/golang/protobuf/jsonpb"
+	"github.com/golang/protobuf/proto"
+	"google.golang.org/grpc/encoding"
+)
+
+const (
+	codecJson  = "json"
+	codecProto = "proto"
+)
+
+func init() {
+	encoding.RegisterCodec(grpcJson{
+		Marshaler: jsonpb.Marshaler{
+			EmitDefaults: true,
+			OrigName:     true,
+		},
+	})
+}
+
+type grpcJson struct {
+	jsonpb.Marshaler
+	jsonpb.Unmarshaler
+}
+
+// Name implements grpc encoding package Codec interface method,
+// returns the name of the Codec implementation.
+func (_ grpcJson) Name() string {
+	return codecJson
+}
+
+// Marshal implements grpc encoding package Codec interface method,returns the wire format of v.
+func (j grpcJson) Marshal(v interface{}) (out []byte, err error) {
+	if pm, ok := v.(proto.Message); ok {
+		b := new(bytes.Buffer)
+		err := j.Marshaler.Marshal(b, pm)
+		if err != nil {
+			return nil, err
+		}
+		return b.Bytes(), nil
+	}
+	return json.Marshal(v)
+}
+
+// Unmarshal implements grpc encoding package Codec interface method,Unmarshal parses the wire format into v.
+func (j grpcJson) Unmarshal(data []byte, v interface{}) (err error) {
+	if pm, ok := v.(proto.Message); ok {
+		b := bytes.NewBuffer(data)
+		return j.Unmarshaler.Unmarshal(b, pm)
+	}
+	return json.Unmarshal(data, v)
+}

protocol/grpc/config.go

@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 grpc
+
+import (
+	perrors "github.com/pkg/errors"
+)
+
+type (
+	// ServerConfig currently is empty struct,for future expansion
+	ServerConfig struct {
+	}
+
+	// ClientConfig wrap client call parameters
+	ClientConfig struct {
+		// content type, more information refer by https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests
+		ContentSubType string `default:"proto" yaml:"content_sub_type" json:"content_sub_type,omitempty"`
+	}
+)
+
+// GetDefaultClientConfig return grpc client default call options
+func GetDefaultClientConfig() ClientConfig {
+	return ClientConfig{
+		ContentSubType: codecProto,
+	}
+}
+
+// GetDefaultServerConfig currently return empty struct,for future expansion
+func GetDefaultServerConfig() ServerConfig {
+	return ServerConfig{}
+}
+
+// GetClientConfig return grpc client custom call options
+func GetClientConfig() ClientConfig {
+	return ClientConfig{}
+}
+
+// Validate check if custom config encoding is supported in dubbo grpc
+func (c *ClientConfig) Validate() error {
+	if c.ContentSubType != codecJson && c.ContentSubType != codecProto {
+		return perrors.Errorf(" dubbo-go grpc codec currently only support proto、json, %s isn't supported,"+
+			" please check protocol content_sub_type config", c.ContentSubType)
+	}
+	return nil
+}
+
+// Validate currently return empty struct,for future expansion
+func (c *ServerConfig) Validate() error {
+	return nil
+}

protocol/grpc/protoc-gen-dubbo/plugin/dubbo/dubbo.go

@@ -107,7 +107,6 @@ func (g *dubboGrpc) GenerateImports(file *generator.FileDescriptor) {
 	g.P(`dgrpc "github.com/apache/dubbo-go/protocol/grpc"`)
 	g.P(`"github.com/apache/dubbo-go/protocol/invocation"`)
 	g.P(`"github.com/apache/dubbo-go/protocol"`)
-	g.P(`"github.com/apache/dubbo-go/config"`)
 	g.P(` ) `)
 }
 
@@ -266,7 +265,7 @@ func (g *dubboGrpc) generateServerMethod(servName, fullServName string, method *
 		g.P(`invo := invocation.NewRPCInvocation("`, methName, `", args, nil)`)
 
 		g.P("if interceptor == nil {")
-		g.P("result := base.GetProxyImpl().Invoke(invo)")
+		g.P("result := base.GetProxyImpl().Invoke(context.Background(), invo)")
 		g.P("return result.Result(), result.Error()")
 		g.P("}")
 
@@ -276,7 +275,7 @@ func (g *dubboGrpc) generateServerMethod(servName, fullServName string, method *
 		g.P("}")
 
 		g.P("handler := func(ctx ", contextPkg, ".Context, req interface{}) (interface{}, error) {")
-		g.P("result := base.GetProxyImpl().Invoke(invo)")
+		g.P("result := base.GetProxyImpl().Invoke(context.Background(), invo)")
 		g.P("return result.Result(), result.Error()")
 		g.P("}")