github.com/galamsiva2020/kubernetes-heapster-monitoring@v0.0.0-20210823134957-3c1baa7c1e70/metrics/util/util.go (about)

     1  // Copyright 2015 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package util
    16  
    17  import (
    18  	"time"
    19  
    20  	kube_api "k8s.io/api/core/v1"
    21  	"k8s.io/apimachinery/pkg/fields"
    22  	"k8s.io/apimachinery/pkg/util/wait"
    23  	kube_client "k8s.io/client-go/kubernetes"
    24  	v1listers "k8s.io/client-go/listers/core/v1"
    25  	"k8s.io/client-go/tools/cache"
    26  )
    27  
    28  func GetNodeLister(kubeClient *kube_client.Clientset) (v1listers.NodeLister, *cache.Reflector, error) {
    29  	lw := cache.NewListWatchFromClient(kubeClient.CoreV1().RESTClient(), "nodes", kube_api.NamespaceAll, fields.Everything())
    30  	store := cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
    31  	nodeLister := v1listers.NewNodeLister(store)
    32  	reflector := cache.NewReflector(lw, &kube_api.Node{}, store, time.Hour)
    33  	go reflector.Run(wait.NeverStop)
    34  
    35  	return nodeLister, reflector, nil
    36  }