211 lines
6.9 KiB
Go
211 lines
6.9 KiB
Go
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/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cache
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import (
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"fmt"
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"k8s.io/client-go/pkg/api"
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"k8s.io/client-go/pkg/api/errors"
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"k8s.io/client-go/pkg/api/unversioned"
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"k8s.io/client-go/pkg/apis/extensions"
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"k8s.io/client-go/pkg/labels"
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)
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// TODO: generate these classes and methods for all resources of interest using
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// a script. Can use "go generate" once 1.4 is supported by all users.
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// Lister makes an Index have the List method. The Stores must contain only the expected type
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// Example:
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// s := cache.NewStore()
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// lw := cache.ListWatch{Client: c, FieldSelector: sel, Resource: "pods"}
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// r := cache.NewReflector(lw, &extensions.Deployment{}, s).Run()
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// l := StoreToDeploymentLister{s}
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// l.List()
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// StoreToDeploymentLister helps list deployments
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type StoreToDeploymentLister struct {
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Indexer Indexer
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}
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func (s *StoreToDeploymentLister) List(selector labels.Selector) (ret []*extensions.Deployment, err error) {
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err = ListAll(s.Indexer, selector, func(m interface{}) {
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ret = append(ret, m.(*extensions.Deployment))
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})
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return ret, err
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}
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func (s *StoreToDeploymentLister) Deployments(namespace string) storeDeploymentsNamespacer {
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return storeDeploymentsNamespacer{Indexer: s.Indexer, namespace: namespace}
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}
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type storeDeploymentsNamespacer struct {
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Indexer Indexer
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namespace string
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}
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func (s storeDeploymentsNamespacer) List(selector labels.Selector) (ret []*extensions.Deployment, err error) {
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err = ListAllByNamespace(s.Indexer, s.namespace, selector, func(m interface{}) {
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ret = append(ret, m.(*extensions.Deployment))
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})
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return ret, err
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}
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func (s storeDeploymentsNamespacer) Get(name string) (*extensions.Deployment, error) {
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obj, exists, err := s.Indexer.GetByKey(s.namespace + "/" + name)
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if err != nil {
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return nil, err
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}
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if !exists {
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return nil, errors.NewNotFound(extensions.Resource("deployment"), name)
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}
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return obj.(*extensions.Deployment), nil
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}
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// GetDeploymentsForReplicaSet returns a list of deployments managing a replica set. Returns an error only if no matching deployments are found.
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func (s *StoreToDeploymentLister) GetDeploymentsForReplicaSet(rs *extensions.ReplicaSet) (deployments []*extensions.Deployment, err error) {
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if len(rs.Labels) == 0 {
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err = fmt.Errorf("no deployments found for ReplicaSet %v because it has no labels", rs.Name)
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return
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}
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// TODO: MODIFY THIS METHOD so that it checks for the podTemplateSpecHash label
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dList, err := s.Deployments(rs.Namespace).List(labels.Everything())
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if err != nil {
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return
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}
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for _, d := range dList {
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selector, err := unversioned.LabelSelectorAsSelector(d.Spec.Selector)
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if err != nil {
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return nil, fmt.Errorf("invalid label selector: %v", err)
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}
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// If a deployment with a nil or empty selector creeps in, it should match nothing, not everything.
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if selector.Empty() || !selector.Matches(labels.Set(rs.Labels)) {
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continue
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}
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deployments = append(deployments, d)
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}
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if len(deployments) == 0 {
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err = fmt.Errorf("could not find deployments set for ReplicaSet %s in namespace %s with labels: %v", rs.Name, rs.Namespace, rs.Labels)
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}
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return
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}
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// GetDeploymentsForDeployments returns a list of deployments managing a pod. Returns an error only if no matching deployments are found.
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// TODO eliminate shallow copies
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func (s *StoreToDeploymentLister) GetDeploymentsForPod(pod *api.Pod) (deployments []*extensions.Deployment, err error) {
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if len(pod.Labels) == 0 {
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err = fmt.Errorf("no deployments found for Pod %v because it has no labels", pod.Name)
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return
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}
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if len(pod.Labels[extensions.DefaultDeploymentUniqueLabelKey]) == 0 {
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return
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}
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dList, err := s.Deployments(pod.Namespace).List(labels.Everything())
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if err != nil {
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return
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}
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for _, d := range dList {
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selector, err := unversioned.LabelSelectorAsSelector(d.Spec.Selector)
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if err != nil {
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return nil, fmt.Errorf("invalid label selector: %v", err)
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}
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// If a deployment with a nil or empty selector creeps in, it should match nothing, not everything.
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if selector.Empty() || !selector.Matches(labels.Set(pod.Labels)) {
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continue
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}
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deployments = append(deployments, d)
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}
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if len(deployments) == 0 {
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err = fmt.Errorf("could not find deployments set for Pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
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}
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return
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}
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// StoreToReplicaSetLister helps list replicasets
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type StoreToReplicaSetLister struct {
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Indexer Indexer
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}
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func (s *StoreToReplicaSetLister) List(selector labels.Selector) (ret []*extensions.ReplicaSet, err error) {
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err = ListAll(s.Indexer, selector, func(m interface{}) {
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ret = append(ret, m.(*extensions.ReplicaSet))
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})
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return ret, err
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}
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func (s *StoreToReplicaSetLister) ReplicaSets(namespace string) storeReplicaSetsNamespacer {
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return storeReplicaSetsNamespacer{Indexer: s.Indexer, namespace: namespace}
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}
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type storeReplicaSetsNamespacer struct {
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Indexer Indexer
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namespace string
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}
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func (s storeReplicaSetsNamespacer) List(selector labels.Selector) (ret []*extensions.ReplicaSet, err error) {
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err = ListAllByNamespace(s.Indexer, s.namespace, selector, func(m interface{}) {
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ret = append(ret, m.(*extensions.ReplicaSet))
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})
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return ret, err
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}
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func (s storeReplicaSetsNamespacer) Get(name string) (*extensions.ReplicaSet, error) {
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obj, exists, err := s.Indexer.GetByKey(s.namespace + "/" + name)
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if err != nil {
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return nil, err
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}
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if !exists {
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return nil, errors.NewNotFound(extensions.Resource("replicaset"), name)
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}
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return obj.(*extensions.ReplicaSet), nil
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}
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// GetPodReplicaSets returns a list of ReplicaSets managing a pod. Returns an error only if no matching ReplicaSets are found.
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func (s *StoreToReplicaSetLister) GetPodReplicaSets(pod *api.Pod) (rss []*extensions.ReplicaSet, err error) {
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if len(pod.Labels) == 0 {
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err = fmt.Errorf("no ReplicaSets found for pod %v because it has no labels", pod.Name)
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return
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}
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list, err := s.ReplicaSets(pod.Namespace).List(labels.Everything())
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if err != nil {
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return
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}
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for _, rs := range list {
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if rs.Namespace != pod.Namespace {
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continue
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}
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selector, err := unversioned.LabelSelectorAsSelector(rs.Spec.Selector)
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if err != nil {
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return nil, fmt.Errorf("invalid selector: %v", err)
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}
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// If a ReplicaSet with a nil or empty selector creeps in, it should match nothing, not everything.
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if selector.Empty() || !selector.Matches(labels.Set(pod.Labels)) {
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continue
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}
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rss = append(rss, rs)
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}
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if len(rss) == 0 {
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err = fmt.Errorf("could not find ReplicaSet for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
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}
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return
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}
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