daemonset_expansion.go

Documentation: k8s.io/client-go/listers/extensions/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  	apps "k8s.io/api/apps/v1beta1"
    23  	"k8s.io/api/core/v1"
    24  	"k8s.io/api/extensions/v1beta1"
    25  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    26  	"k8s.io/apimachinery/pkg/labels"
    27  )
    28  
    29  // DaemonSetListerExpansion allows custom methods to be added to
    30  // DaemonSetLister.
    31  type DaemonSetListerExpansion interface {
    32  	GetPodDaemonSets(pod *v1.Pod) ([]*v1beta1.DaemonSet, error)
    33  	GetHistoryDaemonSets(history *apps.ControllerRevision) ([]*v1beta1.DaemonSet, error)
    34  }
    35  
    36  // DaemonSetNamespaceListerExpansion allows custom methods to be added to
    37  // DaemonSetNamespaceLister.
    38  type DaemonSetNamespaceListerExpansion interface{}
    39  
    40  // GetPodDaemonSets returns a list of DaemonSets that potentially match a pod.
    41  // Only the one specified in the Pod's ControllerRef will actually manage it.
    42  // Returns an error only if no matching DaemonSets are found.
    43  func (s *daemonSetLister) GetPodDaemonSets(pod *v1.Pod) ([]*v1beta1.DaemonSet, error) {
    44  	var selector labels.Selector
    45  	var daemonSet *v1beta1.DaemonSet
    46  
    47  	if len(pod.Labels) == 0 {
    48  		return nil, fmt.Errorf("no daemon sets found for pod %v because it has no labels", pod.Name)
    49  	}
    50  
    51  	list, err := s.DaemonSets(pod.Namespace).List(labels.Everything())
    52  	if err != nil {
    53  		return nil, err
    54  	}
    55  
    56  	var daemonSets []*v1beta1.DaemonSet
    57  	for i := range list {
    58  		daemonSet = list[i]
    59  		if daemonSet.Namespace != pod.Namespace {
    60  			continue
    61  		}
    62  		selector, err = metav1.LabelSelectorAsSelector(daemonSet.Spec.Selector)
    63  		if err != nil {
    64  			// This object has an invalid selector, it does not match the pod
    65  			continue
    66  		}
    67  
    68  		// If a daemonSet with a nil or empty selector creeps in, it should match nothing, not everything.
    69  		if selector.Empty() || !selector.Matches(labels.Set(pod.Labels)) {
    70  			continue
    71  		}
    72  		daemonSets = append(daemonSets, daemonSet)
    73  	}
    74  
    75  	if len(daemonSets) == 0 {
    76  		return nil, fmt.Errorf("could not find daemon set for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
    77  	}
    78  
    79  	return daemonSets, nil
    80  }
    81  
    82  // GetHistoryDaemonSets returns a list of DaemonSets that potentially
    83  // match a ControllerRevision. Only the one specified in the ControllerRevision's ControllerRef
    84  // will actually manage it.
    85  // Returns an error only if no matching DaemonSets are found.
    86  func (s *daemonSetLister) GetHistoryDaemonSets(history *apps.ControllerRevision) ([]*v1beta1.DaemonSet, error) {
    87  	if len(history.Labels) == 0 {
    88  		return nil, fmt.Errorf("no DaemonSet found for ControllerRevision %s because it has no labels", history.Name)
    89  	}
    90  
    91  	list, err := s.DaemonSets(history.Namespace).List(labels.Everything())
    92  	if err != nil {
    93  		return nil, err
    94  	}
    95  
    96  	var daemonSets []*v1beta1.DaemonSet
    97  	for _, ds := range list {
    98  		selector, err := metav1.LabelSelectorAsSelector(ds.Spec.Selector)
    99  		if err != nil {
   100  			// This object has an invalid selector, it does not match the history object
   101  			continue
   102  		}
   103  		// If a DaemonSet with a nil or empty selector creeps in, it should match nothing, not everything.
   104  		if selector.Empty() || !selector.Matches(labels.Set(history.Labels)) {
   105  			continue
   106  		}
   107  		daemonSets = append(daemonSets, ds)
   108  	}
   109  
   110  	if len(daemonSets) == 0 {
   111  		return nil, fmt.Errorf("could not find DaemonSets for ControllerRevision %s in namespace %s with labels: %v", history.Name, history.Namespace, history.Labels)
   112  	}
   113  
   114  	return daemonSets, nil
   115  }
   116
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