Controller codebase refactoring
This commit is contained in:
gmarek
334
pkg/controller/namespace/namespace_controller.go
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334
pkg/controller/namespace/namespace_controller.go
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@@ -0,0 +1,334 @@
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/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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 namespacecontroller
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import (
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"time"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/client/cache"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/controller/framework"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
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"github.com/golang/glog"
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)
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// NamespaceController is responsible for performing actions dependent upon a namespace phase
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type NamespaceController struct {
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controller *framework.Controller
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StopEverything chan struct{}
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}
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// NewNamespaceController creates a new NamespaceController
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func NewNamespaceController(kubeClient client.Interface, resyncPeriod time.Duration) *NamespaceController {
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_, controller := framework.NewInformer(
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&cache.ListWatch{
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ListFunc: func() (runtime.Object, error) {
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return kubeClient.Namespaces().List(labels.Everything(), fields.Everything())
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},
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WatchFunc: func(resourceVersion string) (watch.Interface, error) {
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return kubeClient.Namespaces().Watch(labels.Everything(), fields.Everything(), resourceVersion)
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},
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},
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&api.Namespace{},
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resyncPeriod,
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framework.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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namespace := obj.(*api.Namespace)
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err := syncNamespace(kubeClient, *namespace)
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if err != nil {
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glog.Error(err)
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}
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},
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UpdateFunc: func(oldObj, newObj interface{}) {
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namespace := newObj.(*api.Namespace)
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err := syncNamespace(kubeClient, *namespace)
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if err != nil {
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glog.Error(err)
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}
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},
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},
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)
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return &NamespaceController{
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controller: controller,
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}
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}
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// Run begins observing the system. It starts a goroutine and returns immediately.
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func (nm *NamespaceController) Run() {
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if nm.StopEverything == nil {
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nm.StopEverything = make(chan struct{})
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go nm.controller.Run(nm.StopEverything)
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}
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}
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// Stop gracefully shutsdown this controller
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func (nm *NamespaceController) Stop() {
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if nm.StopEverything != nil {
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close(nm.StopEverything)
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nm.StopEverything = nil
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}
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}
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// finalized returns true if the spec.finalizers is empty list
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func finalized(namespace api.Namespace) bool {
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return len(namespace.Spec.Finalizers) == 0
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}
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// finalize will finalize the namespace for kubernetes
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func finalize(kubeClient client.Interface, namespace api.Namespace) (*api.Namespace, error) {
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namespaceFinalize := api.Namespace{}
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namespaceFinalize.ObjectMeta = namespace.ObjectMeta
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namespaceFinalize.Spec = namespace.Spec
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finalizerSet := util.NewStringSet()
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for i := range namespace.Spec.Finalizers {
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if namespace.Spec.Finalizers[i] != api.FinalizerKubernetes {
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finalizerSet.Insert(string(namespace.Spec.Finalizers[i]))
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}
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}
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namespaceFinalize.Spec.Finalizers = make([]api.FinalizerName, 0, len(finalizerSet))
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for _, value := range finalizerSet.List() {
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namespaceFinalize.Spec.Finalizers = append(namespaceFinalize.Spec.Finalizers, api.FinalizerName(value))
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}
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return kubeClient.Namespaces().Finalize(&namespaceFinalize)
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}
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// deleteAllContent will delete all content known to the system in a namespace
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func deleteAllContent(kubeClient client.Interface, namespace string) (err error) {
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err = deleteServiceAccounts(kubeClient, namespace)
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if err != nil {
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return err
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}
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err = deleteServices(kubeClient, namespace)
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if err != nil {
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return err
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}
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err = deleteReplicationControllers(kubeClient, namespace)
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if err != nil {
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return err
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}
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err = deletePods(kubeClient, namespace)
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if err != nil {
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return err
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}
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err = deleteSecrets(kubeClient, namespace)
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if err != nil {
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return err
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}
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err = deletePersistentVolumeClaims(kubeClient, namespace)
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if err != nil {
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return err
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}
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err = deleteLimitRanges(kubeClient, namespace)
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if err != nil {
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return err
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}
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err = deleteResourceQuotas(kubeClient, namespace)
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if err != nil {
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return err
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}
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err = deleteEvents(kubeClient, namespace)
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if err != nil {
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return err
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}
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return nil
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}
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// syncNamespace makes namespace life-cycle decisions
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func syncNamespace(kubeClient client.Interface, namespace api.Namespace) (err error) {
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if namespace.DeletionTimestamp == nil {
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return nil
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}
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// if there is a deletion timestamp, and the status is not terminating, then update status
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if !namespace.DeletionTimestamp.IsZero() && namespace.Status.Phase != api.NamespaceTerminating {
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newNamespace := api.Namespace{}
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newNamespace.ObjectMeta = namespace.ObjectMeta
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newNamespace.Status = namespace.Status
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newNamespace.Status.Phase = api.NamespaceTerminating
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result, err := kubeClient.Namespaces().Status(&newNamespace)
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if err != nil {
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return err
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}
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// work with the latest copy so we can proceed to clean up right away without another interval
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namespace = *result
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}
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// if the namespace is already finalized, delete it
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if finalized(namespace) {
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err = kubeClient.Namespaces().Delete(namespace.Name)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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return nil
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}
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// there may still be content for us to remove
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err = deleteAllContent(kubeClient, namespace.Name)
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if err != nil {
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return err
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}
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// we have removed content, so mark it finalized by us
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result, err := finalize(kubeClient, namespace)
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if err != nil {
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return err
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}
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// now check if all finalizers have reported that we delete now
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if finalized(*result) {
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err = kubeClient.Namespaces().Delete(namespace.Name)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteLimitRanges(kubeClient client.Interface, ns string) error {
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items, err := kubeClient.LimitRanges(ns).List(labels.Everything())
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.LimitRanges(ns).Delete(items.Items[i].Name)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteResourceQuotas(kubeClient client.Interface, ns string) error {
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resourceQuotas, err := kubeClient.ResourceQuotas(ns).List(labels.Everything())
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if err != nil {
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return err
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}
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for i := range resourceQuotas.Items {
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err := kubeClient.ResourceQuotas(ns).Delete(resourceQuotas.Items[i].Name)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteServiceAccounts(kubeClient client.Interface, ns string) error {
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items, err := kubeClient.ServiceAccounts(ns).List(labels.Everything(), fields.Everything())
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.ServiceAccounts(ns).Delete(items.Items[i].Name)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteServices(kubeClient client.Interface, ns string) error {
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items, err := kubeClient.Services(ns).List(labels.Everything())
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.Services(ns).Delete(items.Items[i].Name)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteReplicationControllers(kubeClient client.Interface, ns string) error {
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items, err := kubeClient.ReplicationControllers(ns).List(labels.Everything())
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.ReplicationControllers(ns).Delete(items.Items[i].Name)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deletePods(kubeClient client.Interface, ns string) error {
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items, err := kubeClient.Pods(ns).List(labels.Everything(), fields.Everything())
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.Pods(ns).Delete(items.Items[i].Name, nil)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteEvents(kubeClient client.Interface, ns string) error {
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items, err := kubeClient.Events(ns).List(labels.Everything(), fields.Everything())
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.Events(ns).Delete(items.Items[i].Name)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteSecrets(kubeClient client.Interface, ns string) error {
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items, err := kubeClient.Secrets(ns).List(labels.Everything(), fields.Everything())
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.Secrets(ns).Delete(items.Items[i].Name)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deletePersistentVolumeClaims(kubeClient client.Interface, ns string) error {
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items, err := kubeClient.PersistentVolumeClaims(ns).List(labels.Everything(), fields.Everything())
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.PersistentVolumeClaims(ns).Delete(items.Items[i].Name)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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