| /* |
| * 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 ( |
| "sync" |
| ) |
| import ( |
| "github.com/apache/dubbo-getty" |
| perrors "github.com/pkg/errors" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go/common" |
| "github.com/apache/dubbo-go/common/logger" |
| ) |
| |
| type ZkClientFacade interface { |
| ZkClient() *ZookeeperClient |
| SetZkClient(*ZookeeperClient) |
| ZkClientLock() *sync.Mutex |
| WaitGroup() *sync.WaitGroup // for wait group control, zk client listener & zk client container |
| Done() chan struct{} // for zk client control |
| RestartCallBack() bool |
| GetUrl() *common.URL |
| } |
| |
| // HandleClientRestart keeps the connection between client and server |
| func HandleClientRestart(r ZkClientFacade) { |
| var ( |
| err error |
| |
| failTimes int |
| ) |
| |
| LOOP: |
| for { |
| select { |
| case <-r.Done(): |
| r.WaitGroup().Done() // dec the wg when registry is closed |
| logger.Warnf("(ZkProviderRegistry)reconnectZkRegistry goroutine exit now...") |
| break LOOP |
| // re-register all services |
| case <-r.ZkClient().Done(): |
| r.ZkClientLock().Lock() |
| r.ZkClient().Close() |
| zkName := r.ZkClient().name |
| zkAddress := r.ZkClient().ZkAddrs |
| r.SetZkClient(nil) |
| r.ZkClientLock().Unlock() |
| r.WaitGroup().Done() // dec the wg when zk client is closed |
| |
| // Connect zk until success. |
| failTimes = 0 |
| for { |
| select { |
| case <-r.Done(): |
| r.WaitGroup().Done() // dec the wg when registry is closed |
| logger.Warnf("(ZkProviderRegistry)reconnectZkRegistry goroutine exit now...") |
| break LOOP |
| case <-getty.GetTimeWheel().After(timeSecondDuration(failTimes * ConnDelay)): // Prevent crazy reconnection zk. |
| } |
| err = ValidateZookeeperClient(r, WithZkName(zkName)) |
| logger.Infof("ZkProviderRegistry.validateZookeeperClient(zkAddr{%s}) = error{%#v}", |
| zkAddress, perrors.WithStack(err)) |
| if err == nil && r.RestartCallBack() { |
| break |
| } |
| failTimes++ |
| logger.Warnf("ZK reconnect failed %d times", failTimes) |
| if MaxFailTimes <= failTimes { |
| failTimes = MaxFailTimes |
| } |
| } |
| } |
| } |
| } |