| /* |
| * 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 ( |
| "context" |
| "reflect" |
| "sync" |
| ) |
| |
| import ( |
| hessian2 "github.com/apache/dubbo-go-hessian2" |
| "github.com/pkg/errors" |
| "google.golang.org/grpc/connectivity" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go/common" |
| "github.com/apache/dubbo-go/common/logger" |
| "github.com/apache/dubbo-go/protocol" |
| ) |
| |
| var ( |
| errNoReply = errors.New("request need @response") |
| ) |
| |
| // nolint |
| type GrpcInvoker struct { |
| protocol.BaseInvoker |
| quitOnce sync.Once |
| clientGuard *sync.RWMutex |
| client *Client |
| } |
| |
| // NewGrpcInvoker returns a Grpc invoker instance |
| func NewGrpcInvoker(url *common.URL, client *Client) *GrpcInvoker { |
| return &GrpcInvoker{ |
| BaseInvoker: *protocol.NewBaseInvoker(url), |
| clientGuard: &sync.RWMutex{}, |
| client: client, |
| } |
| } |
| |
| func (gi *GrpcInvoker) setClient(client *Client) { |
| gi.clientGuard.Lock() |
| defer gi.clientGuard.Unlock() |
| |
| gi.client = client |
| } |
| |
| func (gi *GrpcInvoker) getClient() *Client { |
| gi.clientGuard.RLock() |
| defer gi.clientGuard.RUnlock() |
| |
| return gi.client |
| } |
| |
| // Invoke is used to call service method by invocation |
| func (gi *GrpcInvoker) Invoke(ctx context.Context, invocation protocol.Invocation) protocol.Result { |
| var ( |
| result protocol.RPCResult |
| ) |
| |
| if !gi.BaseInvoker.IsAvailable() { |
| // Generally, the case will not happen, because the invoker has been removed |
| // from the invoker list before destroy,so no new request will enter the destroyed invoker |
| logger.Warnf("this grpcInvoker is destroyed") |
| result.Err = protocol.ErrDestroyedInvoker |
| return &result |
| } |
| |
| gi.clientGuard.RLock() |
| defer gi.clientGuard.RUnlock() |
| |
| if gi.client == nil { |
| result.Err = protocol.ErrClientClosed |
| return &result |
| } |
| |
| if !gi.BaseInvoker.IsAvailable() { |
| // Generally, the case will not happen, because the invoker has been removed |
| // from the invoker list before destroy,so no new request will enter the destroyed invoker |
| logger.Warnf("this grpcInvoker is destroying") |
| result.Err = protocol.ErrDestroyedInvoker |
| return &result |
| } |
| |
| if invocation.Reply() == nil { |
| result.Err = errNoReply |
| } |
| |
| var in []reflect.Value |
| in = append(in, reflect.ValueOf(ctx)) |
| in = append(in, invocation.ParameterValues()...) |
| |
| methodName := invocation.MethodName() |
| method := gi.client.invoker.MethodByName(methodName) |
| res := method.Call(in) |
| |
| result.Rest = res[0] |
| // check err |
| if !res[1].IsNil() { |
| result.Err = res[1].Interface().(error) |
| } else { |
| _ = hessian2.ReflectResponse(res[0], invocation.Reply()) |
| } |
| |
| return &result |
| } |
| |
| // IsAvailable get available status |
| func (gi *GrpcInvoker) IsAvailable() bool { |
| client := gi.getClient() |
| if client != nil { |
| return gi.BaseInvoker.IsAvailable() && client.GetState() != connectivity.Shutdown |
| } |
| |
| return false |
| } |
| |
| // IsDestroyed get destroyed status |
| func (gi *GrpcInvoker) IsDestroyed() bool { |
| client := gi.getClient() |
| if client != nil { |
| return gi.BaseInvoker.IsDestroyed() && client.GetState() == connectivity.Shutdown |
| } |
| |
| return false |
| } |
| |
| // Destroy will destroy gRPC's invoker and client, so it is only called once |
| func (gi *GrpcInvoker) Destroy() { |
| gi.quitOnce.Do(func() { |
| gi.BaseInvoker.Destroy() |
| client := gi.getClient() |
| if client != nil { |
| gi.setClient(nil) |
| client.Close() |
| } |
| }) |
| } |