statefulset_expansion.go

Documentation: k8s.io/client-go/listers/apps/v1

     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 v1
    18  
    19  import (
    20  	"fmt"
    21  
    22  	apps "k8s.io/api/apps/v1"
    23  	"k8s.io/api/core/v1"
    24  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    25  	"k8s.io/apimachinery/pkg/labels"
    26  )
    27  
    28  // StatefulSetListerExpansion allows custom methods to be added to
    29  // StatefulSetLister.
    30  type StatefulSetListerExpansion interface {
    31  	GetPodStatefulSets(pod *v1.Pod) ([]*apps.StatefulSet, error)
    32  }
    33  
    34  // StatefulSetNamespaceListerExpansion allows custom methods to be added to
    35  // StatefulSetNamespaceLister.
    36  type StatefulSetNamespaceListerExpansion interface{}
    37  
    38  // GetPodStatefulSets returns a list of StatefulSets that potentially match a pod.
    39  // Only the one specified in the Pod's ControllerRef will actually manage it.
    40  // Returns an error only if no matching StatefulSets are found.
    41  func (s *statefulSetLister) GetPodStatefulSets(pod *v1.Pod) ([]*apps.StatefulSet, error) {
    42  	var selector labels.Selector
    43  	var ps *apps.StatefulSet
    44  
    45  	if len(pod.Labels) == 0 {
    46  		return nil, fmt.Errorf("no StatefulSets found for pod %v because it has no labels", pod.Name)
    47  	}
    48  
    49  	list, err := s.StatefulSets(pod.Namespace).List(labels.Everything())
    50  	if err != nil {
    51  		return nil, err
    52  	}
    53  
    54  	var psList []*apps.StatefulSet
    55  	for i := range list {
    56  		ps = list[i]
    57  		if ps.Namespace != pod.Namespace {
    58  			continue
    59  		}
    60  		selector, err = metav1.LabelSelectorAsSelector(ps.Spec.Selector)
    61  		if err != nil {
    62  			// This object has an invalid selector, it does not match the pod
    63  			continue
    64  		}
    65  
    66  		// If a StatefulSet with a nil or empty selector creeps in, it should match nothing, not everything.
    67  		if selector.Empty() || !selector.Matches(labels.Set(pod.Labels)) {
    68  			continue
    69  		}
    70  		psList = append(psList, ps)
    71  	}
    72  
    73  	if len(psList) == 0 {
    74  		return nil, fmt.Errorf("could not find StatefulSet for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
    75  	}
    76  
    77  	return psList, nil
    78  }
    79
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