| /* |
| * 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 dubbo |
| |
| import ( |
| "context" |
| "strconv" |
| "sync" |
| "sync/atomic" |
| "time" |
| ) |
| |
| import ( |
| "github.com/opentracing/opentracing-go" |
| perrors "github.com/pkg/errors" |
| ) |
| |
| 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/protocol" |
| invocation_impl "github.com/apache/dubbo-go/protocol/invocation" |
| ) |
| |
| var ( |
| // ErrNoReply ... |
| ErrNoReply = perrors.New("request need @response") |
| ErrDestroyedInvoker = perrors.New("request Destroyed invoker") |
| ) |
| |
| var ( |
| attachmentKey = []string{constant.INTERFACE_KEY, constant.GROUP_KEY, constant.TOKEN_KEY, constant.TIMEOUT_KEY} |
| ) |
| |
| // DubboInvoker ... |
| type DubboInvoker struct { |
| protocol.BaseInvoker |
| client *Client |
| quitOnce sync.Once |
| // Used to record the number of requests. -1 represent this DubboInvoker is destroyed |
| reqNum int64 |
| } |
| |
| // NewDubboInvoker ... |
| func NewDubboInvoker(url common.URL, client *Client) *DubboInvoker { |
| return &DubboInvoker{ |
| BaseInvoker: *protocol.NewBaseInvoker(url), |
| client: client, |
| reqNum: 0, |
| } |
| } |
| |
| // Invoke ... |
| func (di *DubboInvoker) Invoke(ctx context.Context, invocation protocol.Invocation) protocol.Result { |
| var ( |
| err error |
| result protocol.RPCResult |
| ) |
| if di.reqNum < 0 { |
| // 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 dubboInvoker is destroyed") |
| result.Err = ErrDestroyedInvoker |
| return &result |
| } |
| atomic.AddInt64(&(di.reqNum), 1) |
| defer atomic.AddInt64(&(di.reqNum), -1) |
| |
| inv := invocation.(*invocation_impl.RPCInvocation) |
| for _, k := range attachmentKey { |
| if v := di.GetUrl().GetParam(k, ""); len(v) > 0 { |
| inv.SetAttachments(k, v) |
| } |
| } |
| |
| // put the ctx into attachment |
| di.appendCtx(ctx, inv) |
| |
| url := di.GetUrl() |
| // async |
| async, err := strconv.ParseBool(inv.AttachmentsByKey(constant.ASYNC_KEY, "false")) |
| if err != nil { |
| logger.Errorf("ParseBool - error: %v", err) |
| async = false |
| } |
| response := NewResponse(inv.Reply(), nil) |
| if async { |
| if callBack, ok := inv.CallBack().(func(response common.CallbackResponse)); ok { |
| result.Err = di.client.AsyncCall(NewRequest(url.Location, url, inv.MethodName(), inv.Arguments(), inv.Attachments()), callBack, response) |
| } else { |
| result.Err = di.client.CallOneway(NewRequest(url.Location, url, inv.MethodName(), inv.Arguments(), inv.Attachments())) |
| } |
| } else { |
| if inv.Reply() == nil { |
| result.Err = ErrNoReply |
| } else { |
| result.Err = di.client.Call(NewRequest(url.Location, url, inv.MethodName(), inv.Arguments(), inv.Attachments()), response) |
| } |
| } |
| if result.Err == nil { |
| result.Rest = inv.Reply() |
| result.Attrs = response.atta |
| } |
| logger.Debugf("result.Err: %v, result.Rest: %v", result.Err, result.Rest) |
| |
| return &result |
| } |
| |
| // Destroy ... |
| func (di *DubboInvoker) Destroy() { |
| di.quitOnce.Do(func() { |
| for { |
| if di.reqNum == 0 { |
| di.reqNum = -1 |
| logger.Infof("dubboInvoker is destroyed,url:{%s}", di.GetUrl().Key()) |
| di.BaseInvoker.Destroy() |
| if di.client != nil { |
| di.client.Close() |
| di.client = nil |
| } |
| break |
| } |
| logger.Warnf("DubboInvoker is to be destroyed, wait {%v} req end,url:{%s}", di.reqNum, di.GetUrl().Key()) |
| time.Sleep(1 * time.Second) |
| } |
| |
| }) |
| } |
| |
| // Finally, I made the decision that I don't provide a general way to transfer the whole context |
| // because it could be misused. If the context contains to many key-value pairs, the performance will be much lower. |
| func (di *DubboInvoker) appendCtx(ctx context.Context, inv *invocation_impl.RPCInvocation) { |
| // inject opentracing ctx |
| currentSpan := opentracing.SpanFromContext(ctx) |
| if currentSpan != nil { |
| carrier := opentracing.TextMapCarrier(inv.Attachments()) |
| err := opentracing.GlobalTracer().Inject(currentSpan.Context(), opentracing.TextMap, carrier) |
| if err != nil { |
| logger.Errorf("Could not inject the span context into attachments: %v", err) |
| } |
| } |
| } |