wenxuwan commented on a change in pull request #1071: URL: https://github.com/apache/dubbo-go/pull/1071#discussion_r588995471
########## File path: protocol/dubbo3/dubbo3_protocol.go ########## @@ -0,0 +1,162 @@ +/* + * 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 dubbo3 + +import ( + "fmt" + "reflect" + "sync" +) + +import ( + "github.com/apache/dubbo-go/common" + "github.com/apache/dubbo-go/common/constant" + "github.com/apache/dubbo-go/common/extension" + "github.com/apache/dubbo-go/common/logger" + "github.com/apache/dubbo-go/config" + "github.com/apache/dubbo-go/protocol" + dubbo3 "github.com/dubbogo/triple/pkg/triple" + "google.golang.org/grpc" +) + +const ( + // DUBBO3 is dubbo3 protocol name + DUBBO3 = "dubbo3" +) + +func init() { + extension.SetProtocol(DUBBO3, GetProtocol) +} + +var ( + dubboProtocol *DubboProtocol +) + +// It support dubbo protocol. It implements Protocol interface for dubbo protocol. +type DubboProtocol struct { + protocol.BaseProtocol + serverLock sync.Mutex + serverMap map[string]*dubbo3.TripleServer // It is store relationship about serviceKey(group/interface:version) and ExchangeServer +} + +// NewDubboProtocol create a dubbo protocol. +func NewDubboProtocol() *DubboProtocol { + return &DubboProtocol{ + BaseProtocol: protocol.NewBaseProtocol(), + serverMap: make(map[string]*dubbo3.TripleServer), + } +} + +// Export export dubbo3 service. +func (dp *DubboProtocol) Export(invoker protocol.Invoker) protocol.Exporter { + url := invoker.GetUrl() + serviceKey := url.ServiceKey() + exporter := NewDubboExporter(serviceKey, invoker, dp.ExporterMap()) + dp.SetExporterMap(serviceKey, exporter) + logger.Infof("Export service: %s", url.String()) + // start server + + dp.openServer(url) + return exporter +} + +// Refer create dubbo3 service reference. +func (dp *DubboProtocol) Refer(url *common.URL) protocol.Invoker { + invoker, err := NewDubboInvoker(url) + if err != nil { + logger.Errorf("Refer url = %+v, with error = %s", url, err.Error()) + return nil + } + dp.SetInvokers(invoker) + logger.Infof("Refer service: %s", url.String()) + return invoker +} + +// Destroy destroy dubbo3 service. +func (dp *DubboProtocol) Destroy() { + dp.BaseProtocol.Destroy() + + // stop server + for key, server := range dp.serverMap { + delete(dp.serverMap, key) + server.Stop() + } +} + +// Dubbo3GrpcService is gRPC service +type Dubbo3GrpcService interface { + // SetProxyImpl sets proxy. + SetProxyImpl(impl protocol.Invoker) + // GetProxyImpl gets proxy. + GetProxyImpl() protocol.Invoker + // ServiceDesc gets an RPC service's specification. + ServiceDesc() *grpc.ServiceDesc +} + +// openServer open a dubbo3 server +func (dp *DubboProtocol) openServer(url *common.URL) { + _, ok := dp.serverMap[url.Location] + if ok { + return + } + _, ok = dp.ExporterMap().Load(url.ServiceKey()) + if !ok { + panic("[DubboProtocol]" + url.Key() + "is not existing") + } + + dp.serverLock.Lock() + defer dp.serverLock.Unlock() + _, ok = dp.serverMap[url.Location] + if ok { + return + } + key := url.GetParam(constant.BEAN_NAME_KEY, "") + service := config.GetProviderService(key) + + m, ok := reflect.TypeOf(service).MethodByName("SetProxyImpl") + if !ok { + panic("method SetProxyImpl is necessary for grpc service") + } + + exporter, _ := dubboProtocol.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) + + srv := dubbo3.NewTripleServer(url, service.(dubbo3.Dubbo3GrpcService)) + + dp.serverMap[url.Location] = srv + + srv.Start() +} + +// GetProtocol get a single dubbo3 protocol. +func GetProtocol() protocol.Protocol { Review comment: May be use sync.once is better for Singleton mode ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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