github.com/nacos-group/nacos-sdk-go@v1.1.4/clients/naming_client/subscribe_callback.go (about) 1 /* 2 * Copyright 1999-2020 Alibaba Group Holding Ltd. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package naming_client 18 19 import ( 20 "errors" 21 22 "github.com/nacos-group/nacos-sdk-go/clients/cache" 23 "github.com/nacos-group/nacos-sdk-go/common/logger" 24 "github.com/nacos-group/nacos-sdk-go/model" 25 "github.com/nacos-group/nacos-sdk-go/util" 26 ) 27 28 type SubscribeCallback struct { 29 callbackFuncsMap cache.ConcurrentMap 30 } 31 32 func NewSubscribeCallback() SubscribeCallback { 33 ed := SubscribeCallback{} 34 ed.callbackFuncsMap = cache.NewConcurrentMap() 35 return ed 36 } 37 38 func (ed *SubscribeCallback) AddCallbackFuncs(serviceName string, clusters string, callbackFunc *func(services []model.SubscribeService, err error)) { 39 logger.Info("adding " + serviceName + " with " + clusters + " to listener map") 40 key := util.GetServiceCacheKey(serviceName, clusters) 41 var funcs []*func(services []model.SubscribeService, err error) 42 old, ok := ed.callbackFuncsMap.Get(key) 43 if ok { 44 funcs = append(funcs, old.([]*func(services []model.SubscribeService, err error))...) 45 } 46 funcs = append(funcs, callbackFunc) 47 ed.callbackFuncsMap.Set(key, funcs) 48 } 49 50 func (ed *SubscribeCallback) RemoveCallbackFuncs(serviceName string, clusters string, callbackFunc *func(services []model.SubscribeService, err error)) { 51 logger.Info("removing " + serviceName + " with " + clusters + " to listener map") 52 key := util.GetServiceCacheKey(serviceName, clusters) 53 funcs, ok := ed.callbackFuncsMap.Get(key) 54 if ok && funcs != nil { 55 var newFuncs []*func(services []model.SubscribeService, err error) 56 for _, funcItem := range funcs.([]*func(services []model.SubscribeService, err error)) { 57 if funcItem != callbackFunc { 58 newFuncs = append(newFuncs, funcItem) 59 } 60 } 61 ed.callbackFuncsMap.Set(key, newFuncs) 62 } 63 64 } 65 66 func (ed *SubscribeCallback) ServiceChanged(service *model.Service) { 67 if service == nil || service.Name == "" { 68 return 69 } 70 key := util.GetServiceCacheKey(service.Name, service.Clusters) 71 funcs, ok := ed.callbackFuncsMap.Get(key) 72 if ok { 73 for _, funcItem := range funcs.([]*func(services []model.SubscribeService, err error)) { 74 var subscribeServices []model.SubscribeService 75 if len(service.Hosts) == 0 { 76 (*funcItem)(subscribeServices, errors.New("[client.Subscribe] subscribe failed,hosts is empty")) 77 return 78 } 79 for _, host := range service.Hosts { 80 subscribeService := model.SubscribeService{ 81 Valid: host.Valid, 82 Port: host.Port, 83 Ip: host.Ip, 84 Metadata: host.Metadata, 85 ServiceName: host.ServiceName, 86 ClusterName: host.ClusterName, 87 Weight: host.Weight, 88 InstanceId: host.InstanceId, 89 Enable: host.Enable, 90 Healthy: host.Healthy, 91 } 92 subscribeServices = append(subscribeServices, subscribeService) 93 } 94 (*funcItem)(subscribeServices, nil) 95 } 96 } 97 }