poddisruptionbudget_expansion.go

Documentation: k8s.io/client-go/listers/policy/v1beta1

     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 v1beta1
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"k8s.io/api/core/v1"
    23  	policy "k8s.io/api/policy/v1beta1"
    24  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    25  	"k8s.io/apimachinery/pkg/labels"
    26  )
    27  
    28  // PodDisruptionBudgetListerExpansion allows custom methods to be added to
    29  // PodDisruptionBudgetLister.
    30  type PodDisruptionBudgetListerExpansion interface {
    31  	GetPodPodDisruptionBudgets(pod *v1.Pod) ([]*policy.PodDisruptionBudget, error)
    32  }
    33  
    34  // PodDisruptionBudgetNamespaceListerExpansion allows custom methods to be added to
    35  // PodDisruptionBudgetNamespaceLister.
    36  type PodDisruptionBudgetNamespaceListerExpansion interface{}
    37  
    38  // GetPodPodDisruptionBudgets returns a list of PodDisruptionBudgets matching a pod.  Returns an error only if no matching PodDisruptionBudgets are found.
    39  func (s *podDisruptionBudgetLister) GetPodPodDisruptionBudgets(pod *v1.Pod) ([]*policy.PodDisruptionBudget, error) {
    40  	var selector labels.Selector
    41  
    42  	list, err := s.PodDisruptionBudgets(pod.Namespace).List(labels.Everything())
    43  	if err != nil {
    44  		return nil, err
    45  	}
    46  
    47  	var pdbList []*policy.PodDisruptionBudget
    48  	for i := range list {
    49  		pdb := list[i]
    50  		selector, err = metav1.LabelSelectorAsSelector(pdb.Spec.Selector)
    51  		if err != nil {
    52  			// This object has an invalid selector, it does not match the pod
    53  			continue
    54  		}
    55  
    56  		// If a PDB with a nil or empty selector creeps in, it should match nothing, not everything.
    57  		if selector.Empty() || !selector.Matches(labels.Set(pod.Labels)) {
    58  			continue
    59  		}
    60  		pdbList = append(pdbList, pdb)
    61  	}
    62  
    63  	if len(pdbList) == 0 {
    64  		return nil, fmt.Errorf("could not find PodDisruptionBudget for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
    65  	}
    66  
    67  	return pdbList, nil
    68  }
    69
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