| /* |
| * 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 ( |
| "fmt" |
| "net" |
| "reflect" |
| ) |
| |
| import ( |
| "github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc" |
| "github.com/opentracing/opentracing-go" |
| "google.golang.org/grpc" |
| ) |
| |
| 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" |
| "github.com/apache/dubbo-go/protocol" |
| ) |
| |
| // Server is a gRPC server |
| type Server struct { |
| grpcServer *grpc.Server |
| } |
| |
| // NewServer creates a new server |
| func NewServer() *Server { |
| return &Server{} |
| } |
| |
| // DubboGrpcService is gRPC service |
| type DubboGrpcService interface { |
| // SetProxyImpl sets proxy. |
| SetProxyImpl(impl protocol.Invoker) |
| // GetProxyImpl gets proxy. |
| GetProxyImpl() protocol.Invoker |
| // ServiceDesc gets an RPC service's specification. |
| ServiceDesc() *grpc.ServiceDesc |
| } |
| |
| // Start gRPC server with @url |
| func (s *Server) Start(url common.URL) { |
| var ( |
| addr string |
| err error |
| ) |
| addr = url.Location |
| lis, err := net.Listen("tcp", addr) |
| if err != nil { |
| panic(err) |
| } |
| |
| // if global trace instance was set, then server tracer instance can be get. If not , will return Nooptracer |
| tracer := opentracing.GlobalTracer() |
| server := grpc.NewServer( |
| grpc.UnaryInterceptor(otgrpc.OpenTracingServerInterceptor(tracer))) |
| |
| key := url.GetParam(constant.BEAN_NAME_KEY, "") |
| service := config.GetProviderService(key) |
| |
| ds, ok := service.(DubboGrpcService) |
| if !ok { |
| panic("illegal service type registered") |
| } |
| |
| m, ok := reflect.TypeOf(service).MethodByName("SetProxyImpl") |
| if !ok { |
| panic("method SetProxyImpl is necessary for grpc service") |
| } |
| |
| exporter, _ := grpcProtocol.ExporterMap().Load(url.ServiceKey()) |
| if exporter == nil { |
| panic(fmt.Sprintf("no exporter found for servicekey: %v", url.ServiceKey())) |
| } |
| invoker := exporter.(protocol.Exporter).GetInvoker() |
| if invoker == nil { |
| panic(fmt.Sprintf("no invoker found for servicekey: %v", url.ServiceKey())) |
| } |
| in := []reflect.Value{reflect.ValueOf(service)} |
| in = append(in, reflect.ValueOf(invoker)) |
| m.Func.Call(in) |
| |
| server.RegisterService(ds.ServiceDesc(), service) |
| |
| s.grpcServer = server |
| go func() { |
| if err = server.Serve(lis); err != nil { |
| logger.Errorf("server serve failed with err: %v", err) |
| } |
| }() |
| } |
| |
| // Stop gRPC server |
| func (s *Server) Stop() { |
| s.grpcServer.Stop() |
| } |