| /* |
| * 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 adaptivesvc |
| |
| import ( |
| "context" |
| "strconv" |
| ) |
| |
| import ( |
| "github.com/dubbogo/gost/log/logger" |
| |
| perrors "github.com/pkg/errors" |
| ) |
| |
| import ( |
| "dubbo.apache.org/dubbo-go/v3/cluster/cluster/base" |
| "dubbo.apache.org/dubbo-go/v3/cluster/directory" |
| "dubbo.apache.org/dubbo-go/v3/cluster/metrics" |
| clsutils "dubbo.apache.org/dubbo-go/v3/cluster/utils" |
| "dubbo.apache.org/dubbo-go/v3/common/constant" |
| "dubbo.apache.org/dubbo-go/v3/common/extension" |
| "dubbo.apache.org/dubbo-go/v3/protocol" |
| ) |
| |
| type adaptiveServiceClusterInvoker struct { |
| base.BaseClusterInvoker |
| } |
| |
| func newAdaptiveServiceClusterInvoker(directory directory.Directory) protocol.Invoker { |
| return &adaptiveServiceClusterInvoker{ |
| BaseClusterInvoker: base.NewBaseClusterInvoker(directory), |
| } |
| } |
| |
| func (ivk *adaptiveServiceClusterInvoker) Invoke(ctx context.Context, invocation protocol.Invocation) protocol.Result { |
| invokers := ivk.Directory.List(invocation) |
| if err := ivk.CheckInvokers(invokers, invocation); err != nil { |
| return &protocol.RPCResult{Err: err} |
| } |
| |
| // get loadBalance |
| lbKey := invokers[0].GetURL().GetParam(constant.LoadbalanceKey, constant.LoadBalanceKeyP2C) |
| if lbKey != constant.LoadBalanceKeyP2C { |
| return &protocol.RPCResult{Err: perrors.Errorf("adaptive service not supports %s load balance", lbKey)} |
| } |
| lb := extension.GetLoadbalance(lbKey) |
| |
| // select a node by the loadBalance |
| invoker := lb.Select(invokers, invocation) |
| |
| // invoke |
| invocation.SetAttachment(constant.AdaptiveServiceEnabledKey, constant.AdaptiveServiceIsEnabled) |
| result := invoker.Invoke(ctx, invocation) |
| |
| // if the adaptive service encounters an error, DO NOT |
| // update the metrics. |
| if clsutils.IsAdaptiveServiceFailed(result.Error()) { |
| return result |
| } |
| |
| // update metrics |
| var remainingStr string |
| remainingIface := result.Attachment(constant.AdaptiveServiceRemainingKey, nil) |
| if remainingIface != nil { |
| if str, strOK := remainingIface.(string); strOK { |
| remainingStr = str |
| } else if strArr, strArrOK := remainingIface.([]string); strArrOK && len(strArr) > 0 { |
| remainingStr = strArr[0] |
| } |
| } |
| if remainingStr == "" { |
| logger.Errorf("[adasvc cluster] The %s field type of value %v should be string.", |
| constant.AdaptiveServiceRemainingKey, remainingIface) |
| return result |
| } |
| remaining, err := strconv.Atoi(remainingStr) |
| if err != nil { |
| logger.Warnf("the remaining is unexpected, we need a int type, but we got %s, err: %v.", remainingStr, err) |
| return result |
| } |
| logger.Debugf("[adasvc cluster] The server status was received successfully, %s: %#v", |
| constant.AdaptiveServiceRemainingKey, remainingStr) |
| err = metrics.LocalMetrics.SetMethodMetrics(invoker.GetURL(), |
| invocation.MethodName(), metrics.HillClimbing, uint64(remaining)) |
| if err != nil { |
| logger.Warnf("adaptive service metrics update is failed, err: %v", err) |
| return &protocol.RPCResult{Err: err} |
| } |
| |
| return result |
| } |