replicaset_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  // ReplicaSetListerExpansion allows custom methods to be added to
    29  // ReplicaSetLister.
    30  type ReplicaSetListerExpansion interface {
    31  	GetPodReplicaSets(pod *v1.Pod) ([]*apps.ReplicaSet, error)
    32  }
    33  
    34  // ReplicaSetNamespaceListerExpansion allows custom methods to be added to
    35  // ReplicaSetNamespaceLister.
    36  type ReplicaSetNamespaceListerExpansion interface{}
    37  
    38  // GetPodReplicaSets returns a list of ReplicaSets 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 ReplicaSets are found.
    41  func (s *replicaSetLister) GetPodReplicaSets(pod *v1.Pod) ([]*apps.ReplicaSet, error) {
    42  	if len(pod.Labels) == 0 {
    43  		return nil, fmt.Errorf("no ReplicaSets found for pod %v because it has no labels", pod.Name)
    44  	}
    45  
    46  	list, err := s.ReplicaSets(pod.Namespace).List(labels.Everything())
    47  	if err != nil {
    48  		return nil, err
    49  	}
    50  
    51  	var rss []*apps.ReplicaSet
    52  	for _, rs := range list {
    53  		if rs.Namespace != pod.Namespace {
    54  			continue
    55  		}
    56  		selector, err := metav1.LabelSelectorAsSelector(rs.Spec.Selector)
    57  		if err != nil {
    58  			// This object has an invalid selector, it does not match the pod
    59  			continue
    60  		}
    61  
    62  		// If a ReplicaSet with a nil or empty selector creeps in, it should match nothing, not everything.
    63  		if selector.Empty() || !selector.Matches(labels.Set(pod.Labels)) {
    64  			continue
    65  		}
    66  		rss = append(rss, rs)
    67  	}
    68  
    69  	if len(rss) == 0 {
    70  		return nil, fmt.Errorf("could not find ReplicaSet for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
    71  	}
    72  
    73  	return rss, nil
    74  }
    75
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