| /* |
| * 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 kubernetes |
| |
| import ( |
| "sync" |
| ) |
| |
| import ( |
| perrors "github.com/pkg/errors" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go/common/logger" |
| "github.com/apache/dubbo-go/remoting" |
| ) |
| |
| type EventListener struct { |
| client *Client |
| keyMapLock sync.RWMutex |
| keyMap map[string]struct{} |
| wg sync.WaitGroup |
| } |
| |
| func NewEventListener(client *Client) *EventListener { |
| return &EventListener{ |
| client: client, |
| keyMap: make(map[string]struct{}, 8), |
| } |
| } |
| |
| // Listen on a spec key |
| // this method returns true when spec key deleted, |
| // this method returns false when deep layer connection lose |
| func (l *EventListener) ListenServiceNodeEvent(key string, listener ...remoting.DataListener) bool { |
| defer l.wg.Done() |
| for { |
| wc, done, err := l.client.Watch(key) |
| if err != nil { |
| logger.Warnf("watch exist{key:%s} = error{%v}", key, err) |
| return false |
| } |
| |
| select { |
| |
| // client stopped |
| case <-l.client.Done(): |
| logger.Warnf("kubernetes client stopped") |
| return false |
| |
| // watcherSet watcher stopped |
| case <-done: |
| logger.Warnf("kubernetes watcherSet watcher stopped") |
| return false |
| |
| // handle kubernetes-watcherSet events |
| case e, ok := <-wc: |
| if !ok { |
| logger.Warnf("kubernetes-watcherSet watch-chan closed") |
| return false |
| } |
| |
| if l.handleEvents(e, listener...) { |
| // if event is delete |
| return true |
| } |
| } |
| } |
| } |
| |
| // return true means the event type is DELETE |
| // return false means the event type is CREATE || UPDATE |
| func (l *EventListener) handleEvents(event *WatcherEvent, listeners ...remoting.DataListener) bool { |
| |
| logger.Infof("got a kubernetes-watcherSet event {type: %d, key: %s}", event.EventType, event.Key) |
| |
| switch event.EventType { |
| case Create: |
| for _, listener := range listeners { |
| logger.Infof("kubernetes-watcherSet get event (key{%s}) = event{EventNodeDataCreated}", event.Key) |
| listener.DataChange(remoting.Event{ |
| Path: string(event.Key), |
| Action: remoting.EventTypeAdd, |
| Content: string(event.Value), |
| }) |
| } |
| return false |
| case Update: |
| for _, listener := range listeners { |
| logger.Infof("kubernetes-watcherSet get event (key{%s}) = event{EventNodeDataChanged}", event.Key) |
| listener.DataChange(remoting.Event{ |
| Path: string(event.Key), |
| Action: remoting.EventTypeUpdate, |
| Content: string(event.Value), |
| }) |
| } |
| return false |
| case Delete: |
| logger.Warnf("kubernetes-watcherSet get event (key{%s}) = event{EventNodeDeleted}", event.Key) |
| return true |
| default: |
| return false |
| } |
| } |
| |
| // Listen on a set of key with spec prefix |
| func (l *EventListener) ListenServiceNodeEventWithPrefix(prefix string, listener ...remoting.DataListener) { |
| |
| defer l.wg.Done() |
| for { |
| wc, done, err := l.client.WatchWithPrefix(prefix) |
| if err != nil { |
| logger.Warnf("listenDirEvent(key{%s}) = error{%v}", prefix, err) |
| } |
| |
| select { |
| // client stopped |
| case <-l.client.Done(): |
| logger.Warnf("kubernetes client stopped") |
| return |
| |
| // watcher stopped |
| case <-done: |
| logger.Warnf("kubernetes watcherSet watcher stopped") |
| return |
| |
| // kuberentes-watcherSet event stream |
| case e, ok := <-wc: |
| |
| if !ok { |
| logger.Warnf("kubernetes-watcherSet watch-chan closed") |
| return |
| } |
| |
| l.handleEvents(e, listener...) |
| } |
| } |
| } |
| |
| // this func is invoked by kubernetes ConsumerRegistry::Registry/ kubernetes ConsumerRegistry::get/kubernetes ConsumerRegistry::getListener |
| // registry.go:Listen -> listenServiceEvent -> listenDirEvent -> ListenServiceNodeEvent |
| // | |
| // --------> ListenServiceNodeEvent |
| func (l *EventListener) ListenServiceEvent(key string, listener remoting.DataListener) { |
| |
| l.keyMapLock.RLock() |
| _, ok := l.keyMap[key] |
| l.keyMapLock.RUnlock() |
| if ok { |
| logger.Warnf("kubernetes-watcherSet key %s has already been listened.", key) |
| return |
| } |
| |
| l.keyMapLock.Lock() |
| // double check |
| if _, ok := l.keyMap[key]; ok { |
| // another goroutine already set it |
| l.keyMapLock.Unlock() |
| return |
| } |
| l.keyMap[key] = struct{}{} |
| l.keyMapLock.Unlock() |
| |
| keyList, valueList, err := l.client.GetChildren(key) |
| if err != nil { |
| logger.Warnf("Get new node path {%v} 's content error,message is {%v}", key, perrors.WithMessage(err, "get children")) |
| } |
| |
| logger.Infof("get key children list %s, keys %v values %v", key, keyList, valueList) |
| |
| for i, k := range keyList { |
| logger.Infof("got children list key -> %s", k) |
| listener.DataChange(remoting.Event{ |
| Path: k, |
| Action: remoting.EventTypeAdd, |
| Content: valueList[i], |
| }) |
| } |
| |
| logger.Infof("listen dubbo provider key{%s} event and wait to get all provider from kubernetes-watcherSet", key) |
| |
| l.wg.Add(1) |
| go func(key string, listener remoting.DataListener) { |
| l.ListenServiceNodeEventWithPrefix(key, listener) |
| logger.Warnf("listenDirEvent(key{%s}) goroutine exit now", key) |
| }(key, listener) |
| |
| logger.Infof("listen dubbo service key{%s}", key) |
| l.wg.Add(1) |
| go func(key string) { |
| if l.ListenServiceNodeEvent(key) { |
| listener.DataChange(remoting.Event{Path: key, Action: remoting.EventTypeDel}) |
| } |
| logger.Warnf("listenSelf(kubernetes key{%s}) goroutine exit now", key) |
| }(key) |
| } |
| |
| func (l *EventListener) Close() { |
| l.wg.Wait() |
| } |