github.com/galamsiva2020/kubernetes-heapster-monitoring@v0.0.0-20210823134957-3c1baa7c1e70/metrics/processors/namespace_based_enricher.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 processors
    16  
    17  import (
    18  	"net/url"
    19  	"time"
    20  
    21  	"github.com/golang/glog"
    22  
    23  	kube_api "k8s.io/api/core/v1"
    24  	"k8s.io/apimachinery/pkg/fields"
    25  	"k8s.io/apimachinery/pkg/util/wait"
    26  	kube_client "k8s.io/client-go/kubernetes"
    27  	"k8s.io/client-go/tools/cache"
    28  	kube_config "k8s.io/heapster/common/kubernetes"
    29  	"k8s.io/heapster/metrics/core"
    30  )
    31  
    32  type NamespaceBasedEnricher struct {
    33  	store     cache.Store
    34  	reflector *cache.Reflector
    35  }
    36  
    37  func (this *NamespaceBasedEnricher) Name() string {
    38  	return "namespace_based_enricher"
    39  }
    40  
    41  func (this *NamespaceBasedEnricher) Process(batch *core.DataBatch) (*core.DataBatch, error) {
    42  	for _, ms := range batch.MetricSets {
    43  		this.addNamespaceInfo(ms)
    44  	}
    45  	return batch, nil
    46  }
    47  
    48  // Adds UID to all namespaced elements.
    49  func (this *NamespaceBasedEnricher) addNamespaceInfo(metricSet *core.MetricSet) {
    50  	metricSetType, found := metricSet.Labels[core.LabelMetricSetType.Key]
    51  	if !found {
    52  		return
    53  	}
    54  	if metricSetType != core.MetricSetTypePodContainer &&
    55  		metricSetType != core.MetricSetTypePod &&
    56  		metricSetType != core.MetricSetTypeNamespace {
    57  		return
    58  	}
    59  
    60  	namespaceName, found := metricSet.Labels[core.LabelNamespaceName.Key]
    61  	if !found {
    62  		return
    63  	}
    64  
    65  	nsObj, exists, err := this.store.GetByKey(namespaceName)
    66  	if exists && err == nil {
    67  		namespace, ok := nsObj.(*kube_api.Namespace)
    68  		if ok {
    69  			metricSet.Labels[core.LabelPodNamespaceUID.Key] = string(namespace.UID)
    70  		} else {
    71  			glog.Errorf("Wrong namespace store content")
    72  		}
    73  	} else if err != nil {
    74  		glog.Warningf("Failed to get namespace %s: %v", namespaceName, err)
    75  	} else if !exists {
    76  		glog.Warningf("Namespace doesn't exist: %s", namespaceName)
    77  	}
    78  }
    79  
    80  func NewNamespaceBasedEnricher(url *url.URL) (*NamespaceBasedEnricher, error) {
    81  	kubeConfig, err := kube_config.GetKubeClientConfig(url)
    82  	if err != nil {
    83  		return nil, err
    84  	}
    85  	kubeClient := kube_client.NewForConfigOrDie(kubeConfig)
    86  
    87  	// watch nodes
    88  	lw := cache.NewListWatchFromClient(kubeClient.CoreV1().RESTClient(), "namespaces", kube_api.NamespaceAll, fields.Everything())
    89  	store := cache.NewStore(cache.MetaNamespaceKeyFunc)
    90  	reflector := cache.NewReflector(lw, &kube_api.Namespace{}, store, time.Hour)
    91  	go reflector.Run(wait.NeverStop)
    92  
    93  	return &NamespaceBasedEnricher{
    94  		store:     store,
    95  		reflector: reflector,
    96  	}, nil
    97  }