| /* |
| * 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 zookeeper |
| |
| import ( |
| "strings" |
| "sync" |
| "time" |
| ) |
| |
| import ( |
| "dubbo.apache.org/dubbo-go/v3/common" |
| "github.com/dubbo-go-pixiu/pixiu-api/pkg/api/config" |
| "github.com/dubbogo/go-zookeeper/zk" |
| ) |
| |
| import ( |
| common2 "github.com/apache/dubbo-go-pixiu/pixiu/pkg/adapter/dubboregistry/common" |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/adapter/dubboregistry/registry" |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/adapter/dubboregistry/remoting/zookeeper" |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/common/constant" |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/logger" |
| ) |
| |
| var _ registry.Listener = new(serviceListener) |
| |
| // serviceListener normally monitors the /dubbo/[:url.service()]/providers |
| type serviceListener struct { |
| url *common.URL |
| path string |
| client *zookeeper.ZooKeeperClient |
| |
| exit chan struct{} |
| wg sync.WaitGroup |
| adapterListener common2.RegistryEventListener |
| registryMethod map[string]*config.Method |
| mutex sync.Mutex |
| } |
| |
| // newZkSrvListener creates a new zk service listener |
| func newZkSrvListener(url *common.URL, path string, client *zookeeper.ZooKeeperClient, adapterListener common2.RegistryEventListener) *serviceListener { |
| return &serviceListener{ |
| url: url, |
| path: path, |
| client: client, |
| exit: make(chan struct{}), |
| adapterListener: adapterListener, |
| registryMethod: make(map[string]*config.Method), |
| } |
| } |
| |
| func (zkl *serviceListener) WatchAndHandle() { |
| defer zkl.wg.Done() |
| |
| var ( |
| failTimes int64 = 0 |
| delayTimer = time.NewTimer(ConnDelay * time.Duration(failTimes)) |
| ) |
| |
| for { |
| children, e, err := zkl.client.GetChildrenW(zkl.path) |
| // error handling |
| if err != nil { |
| failTimes++ |
| logger.Infof("watching (path{%s}) = error{%v}", zkl.path, err) |
| // Exit the watch if root node is in error |
| if err == zookeeper.ErrNilNode { |
| logger.Errorf("watching (path{%s}) got errNilNode,so exit listen", zkl.path) |
| return |
| } |
| if failTimes > MaxFailTimes { |
| logger.Errorf("Error happens on (path{%s}) exceed max fail times: %s,so exit listen", |
| zkl.path, MaxFailTimes) |
| return |
| } |
| delayTimer.Reset(ConnDelay * time.Duration(failTimes)) |
| <-delayTimer.C |
| continue |
| } |
| failTimes = 0 |
| if continueLoop := zkl.waitEventAndHandlePeriod(children, e); !continueLoop { |
| return |
| } |
| } |
| } |
| |
| func (zkl *serviceListener) waitEventAndHandlePeriod(children []string, e <-chan zk.Event) bool { |
| tickerTTL := defaultTTL |
| ticker := time.NewTicker(tickerTTL) |
| defer ticker.Stop() |
| zkl.handleEvent() |
| |
| for { |
| select { |
| case <-ticker.C: |
| zkl.handleEvent() |
| case zkEvent := <-e: |
| logger.Warnf("get a zookeeper childEventCh{type:%s, server:%s, path:%s, state:%d-%s, err:%s}", |
| zkEvent.Type.String(), zkEvent.Server, zkEvent.Path, zkEvent.State, zookeeper.StateToString(zkEvent.State), zkEvent.Err) |
| ticker.Stop() |
| if zkEvent.Type != zk.EventNodeChildrenChanged { |
| return true |
| } |
| zkl.handleEvent() |
| return true |
| case <-zkl.exit: |
| logger.Warnf("listen(path{%s}) goroutine exit now...", zkl.path) |
| ticker.Stop() |
| return false |
| } |
| } |
| } |
| |
| // whenever it is called, the children node changed and refresh the api configuration. |
| func (zkl *serviceListener) handleEvent() { |
| children, err := zkl.client.GetChildren(zkl.path) |
| if err != nil { |
| // disable the API |
| bkConf, methods, _, _ := registry.ParseDubboString(zkl.url.String()) |
| apiPattern := registry.GetAPIPattern(bkConf) |
| for i := range methods { |
| path := strings.Join([]string{apiPattern, methods[i]}, constant.PathSlash) |
| if err := zkl.adapterListener.OnDeleteRouter(config.Resource{Path: path}); err != nil { |
| logger.Errorf("Error={%s} when try to remove API by path: %s", err.Error(), path) |
| } |
| } |
| return |
| } |
| zkl.url, err = common.NewURL(children[0]) |
| if err != nil { |
| logger.Warnf("Parse service path failed: %s", children[0]) |
| } |
| bkConfig, methods, location, err := registry.ParseDubboString(children[0]) |
| if err != nil { |
| logger.Warnf("Parse dubbo interface provider %s failed; due to \n %s", children[0], err.Error()) |
| return |
| } |
| if len(bkConfig.ApplicationName) == 0 || len(bkConfig.Interface) == 0 { |
| return |
| } |
| |
| mappingParams := []config.MappingParam{ |
| { |
| Name: "requestBody.values", |
| MapTo: "opt.values", |
| }, |
| { |
| Name: "requestBody.types", |
| MapTo: "opt.types", |
| }, |
| } |
| apiPattern := registry.GetAPIPattern(bkConfig) |
| zkl.mutex.Lock() |
| defer zkl.mutex.Unlock() |
| for i := range methods { |
| api := registry.CreateAPIConfig(apiPattern, location, bkConfig, methods[i], mappingParams) |
| key := api.URLPattern + ":" + string(api.Method.HTTPVerb) |
| if _, ok := zkl.registryMethod[key]; ok { |
| return |
| } |
| if err := zkl.adapterListener.OnAddAPI(api); err != nil { |
| logger.Errorf("Error={%s} happens when try to add api %s", err.Error(), api.Path) |
| } else { |
| zkl.registryMethod[key] = &api.Method |
| } |
| } |
| } |
| |
| // Close closes this listener |
| func (zkl *serviceListener) Close() { |
| close(zkl.exit) |
| zkl.wg.Wait() |
| } |