121 lines
3.4 KiB
Go
121 lines
3.4 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 setdefault
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import (
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"context"
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"fmt"
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"io"
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"k8s.io/kubernetes/pkg/volume/util"
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"k8s.io/klog/v2"
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"k8s.io/apiserver/pkg/admission"
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genericadmissioninitializer "k8s.io/apiserver/pkg/admission/initializer"
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"k8s.io/client-go/informers"
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storagev1listers "k8s.io/client-go/listers/storage/v1"
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api "k8s.io/kubernetes/pkg/apis/core"
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"k8s.io/kubernetes/pkg/apis/core/helper"
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)
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const (
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// PluginName is the name of this admission controller plugin
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PluginName = "DefaultStorageClass"
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)
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// Register registers a plugin
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func Register(plugins *admission.Plugins) {
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plugins.Register(PluginName, func(config io.Reader) (admission.Interface, error) {
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plugin := newPlugin()
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return plugin, nil
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})
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}
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// claimDefaulterPlugin holds state for and implements the admission plugin.
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type claimDefaulterPlugin struct {
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*admission.Handler
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lister storagev1listers.StorageClassLister
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}
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var _ admission.Interface = &claimDefaulterPlugin{}
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var _ admission.MutationInterface = &claimDefaulterPlugin{}
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var _ = genericadmissioninitializer.WantsExternalKubeInformerFactory(&claimDefaulterPlugin{})
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// newPlugin creates a new admission plugin.
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func newPlugin() *claimDefaulterPlugin {
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return &claimDefaulterPlugin{
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Handler: admission.NewHandler(admission.Create),
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}
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}
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func (a *claimDefaulterPlugin) SetExternalKubeInformerFactory(f informers.SharedInformerFactory) {
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informer := f.Storage().V1().StorageClasses()
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a.lister = informer.Lister()
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a.SetReadyFunc(informer.Informer().HasSynced)
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}
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// ValidateInitialization ensures lister is set.
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func (a *claimDefaulterPlugin) ValidateInitialization() error {
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if a.lister == nil {
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return fmt.Errorf("missing lister")
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}
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return nil
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}
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// Admit sets the default value of a PersistentVolumeClaim's storage class, in case the user did
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// not provide a value.
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//
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// 1. Find available StorageClasses.
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// 2. Figure which is the default
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// 3. Write to the PVClaim
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func (a *claimDefaulterPlugin) Admit(ctx context.Context, attr admission.Attributes, o admission.ObjectInterfaces) error {
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if attr.GetResource().GroupResource() != api.Resource("persistentvolumeclaims") {
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return nil
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}
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if len(attr.GetSubresource()) != 0 {
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return nil
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}
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pvc, ok := attr.GetObject().(*api.PersistentVolumeClaim)
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// if we can't convert then we don't handle this object so just return
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if !ok {
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return nil
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}
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if helper.PersistentVolumeClaimHasClass(pvc) {
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// The user asked for a class.
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return nil
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}
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klog.V(4).Infof("no storage class for claim %s (generate: %s)", pvc.Name, pvc.GenerateName)
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def, err := util.GetDefaultClass(a.lister)
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if err != nil {
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return admission.NewForbidden(attr, err)
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}
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if def == nil {
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// No default class selected, do nothing about the PVC.
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return nil
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}
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klog.V(4).Infof("defaulting storage class for claim %s (generate: %s) to %s", pvc.Name, pvc.GenerateName, def.Name)
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pvc.Spec.StorageClassName = &def.Name
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return nil
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}
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