1 /* 2 Copyright 2017 The Kubernetes Authors. 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 controllers 18 19 import ( 20 "fmt" 21 22 "k8s.io/klog/v2" 23 24 utilruntime "k8s.io/apimachinery/pkg/util/runtime" 25 "k8s.io/client-go/tools/cache" 26 ) 27 28 // WaitForCacheSync is a wrapper around cache.WaitForCacheSync that generates log messages 29 // indicating that the controller identified by controllerName is waiting for syncs, followed by 30 // either a successful or failed sync. 31 func WaitForCacheSync(controllerName string, stopCh <-chan struct{}, cacheSyncs ...cache.InformerSynced) bool { 32 klog.Infof("Waiting for caches to sync for %s controller", controllerName) 33 34 if !cache.WaitForCacheSync(stopCh, cacheSyncs...) { 35 utilruntime.HandleError(fmt.Errorf("Unable to sync caches for %s controller", controllerName)) 36 return false 37 } 38 39 klog.Infof("Caches are synced for %s controller", controllerName) 40 return true 41 } 42