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86 lines
2.7 KiB
Go
86 lines
2.7 KiB
Go
/*
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Copyright 2022 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 util
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import (
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"sort"
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storagev1 "k8s.io/api/storage/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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storagev1listers "k8s.io/client-go/listers/storage/v1"
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"k8s.io/klog/v2"
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)
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const (
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// isDefaultStorageClassAnnotation represents a StorageClass annotation that
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// marks a class as the default StorageClass
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IsDefaultStorageClassAnnotation = "storageclass.kubernetes.io/is-default-class"
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// betaIsDefaultStorageClassAnnotation is the beta version of IsDefaultStorageClassAnnotation.
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// TODO: remove Beta when no longer used
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BetaIsDefaultStorageClassAnnotation = "storageclass.beta.kubernetes.io/is-default-class"
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)
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// GetDefaultClass returns the default StorageClass from the store, or nil.
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func GetDefaultClass(lister storagev1listers.StorageClassLister) (*storagev1.StorageClass, error) {
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list, err := lister.List(labels.Everything())
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if err != nil {
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return nil, err
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}
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defaultClasses := []*storagev1.StorageClass{}
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for _, class := range list {
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if IsDefaultAnnotation(class.ObjectMeta) {
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defaultClasses = append(defaultClasses, class)
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klog.V(4).Infof("GetDefaultClass added: %s", class.Name)
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}
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}
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if len(defaultClasses) == 0 {
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return nil, nil
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}
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// Primary sort by creation timestamp, newest first
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// Secondary sort by class name, ascending order
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sort.Slice(defaultClasses, func(i, j int) bool {
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if defaultClasses[i].CreationTimestamp.UnixNano() == defaultClasses[j].CreationTimestamp.UnixNano() {
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return defaultClasses[i].Name < defaultClasses[j].Name
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}
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return defaultClasses[i].CreationTimestamp.UnixNano() > defaultClasses[j].CreationTimestamp.UnixNano()
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})
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if len(defaultClasses) > 1 {
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klog.V(4).Infof("%d default StorageClasses were found, choosing the newest: %s", len(defaultClasses), defaultClasses[0].Name)
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}
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return defaultClasses[0], nil
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}
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// IsDefaultAnnotation returns a boolean if the default storage class
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// annotation is set
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// TODO: remove Beta when no longer needed
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func IsDefaultAnnotation(obj metav1.ObjectMeta) bool {
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if obj.Annotations[IsDefaultStorageClassAnnotation] == "true" {
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return true
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}
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if obj.Annotations[BetaIsDefaultStorageClassAnnotation] == "true" {
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return true
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}
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return false
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}
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