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92 lines
2.6 KiB
Go
92 lines
2.6 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package predicates
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import (
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"k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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)
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// FindLabelsInSet gets as many key/value pairs as possible out of a label set.
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func FindLabelsInSet(labelsToKeep []string, selector labels.Set) map[string]string {
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aL := make(map[string]string)
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for _, l := range labelsToKeep {
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if selector.Has(l) {
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aL[l] = selector.Get(l)
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}
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}
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return aL
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}
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// AddUnsetLabelsToMap backfills missing values with values we find in a map.
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func AddUnsetLabelsToMap(aL map[string]string, labelsToAdd []string, labelSet labels.Set) {
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for _, l := range labelsToAdd {
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// if the label is already there, dont overwrite it.
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if _, exists := aL[l]; exists {
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continue
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}
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// otherwise, backfill this label.
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if labelSet.Has(l) {
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aL[l] = labelSet.Get(l)
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}
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}
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}
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// FilterPodsByNamespace filters pods outside a namespace from the given list.
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func FilterPodsByNamespace(pods []*v1.Pod, ns string) []*v1.Pod {
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filtered := []*v1.Pod{}
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for _, nsPod := range pods {
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if nsPod.Namespace == ns {
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filtered = append(filtered, nsPod)
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}
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}
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return filtered
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}
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// CreateSelectorFromLabels is used to define a selector that corresponds to the keys in a map.
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func CreateSelectorFromLabels(aL map[string]string) labels.Selector {
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if aL == nil || len(aL) == 0 {
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return labels.Everything()
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}
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return labels.Set(aL).AsSelector()
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}
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// GetEquivalencePod returns a EquivalencePod which contains a group of pod attributes which can be reused.
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func GetEquivalencePod(pod *v1.Pod) interface{} {
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// For now we only consider pods:
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// 1. OwnerReferences is Controller
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// 2. with same OwnerReferences
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// to be equivalent
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if len(pod.OwnerReferences) != 0 {
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for _, ref := range pod.OwnerReferences {
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if *ref.Controller {
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// a pod can only belongs to one controller
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return &EquivalencePod{
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ControllerRef: ref,
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}
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}
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}
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}
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return nil
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}
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// EquivalencePod is a group of pod attributes which can be reused as equivalence to schedule other pods.
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type EquivalencePod struct {
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ControllerRef metav1.OwnerReference
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}
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