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