Refactor namespace controller to use workers, do more delete collection calls
This commit is contained in:
derekwaynecarr
364
pkg/controller/namespace/namespace_controller_utils.go
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364
pkg/controller/namespace/namespace_controller_utils.go
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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 namespace
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import (
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"fmt"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/errors"
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"k8s.io/kubernetes/pkg/api/unversioned"
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clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
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extensions_unversioned "k8s.io/kubernetes/pkg/client/typed/generated/extensions/unversioned"
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"k8s.io/kubernetes/pkg/util/sets"
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"github.com/golang/glog"
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)
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// contentRemainingError is used to inform the caller that content is not fully removed from the namespace
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type contentRemainingError struct {
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Estimate int64
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}
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func (e *contentRemainingError) Error() string {
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return fmt.Sprintf("some content remains in the namespace, estimate %d seconds before it is removed", e.Estimate)
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}
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// updateNamespaceFunc is a function that makes an update to a namespace
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type updateNamespaceFunc func(kubeClient clientset.Interface, namespace *api.Namespace) (*api.Namespace, error)
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// retryOnConflictError retries the specified fn if there was a conflict error
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// TODO RetryOnConflict should be a generic concept in client code
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func retryOnConflictError(kubeClient clientset.Interface, namespace *api.Namespace, fn updateNamespaceFunc) (result *api.Namespace, err error) {
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latestNamespace := namespace
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for {
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result, err = fn(kubeClient, latestNamespace)
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if err == nil {
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return result, nil
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}
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if !errors.IsConflict(err) {
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return nil, err
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}
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latestNamespace, err = kubeClient.Core().Namespaces().Get(latestNamespace.Name)
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if err != nil {
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return nil, err
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}
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}
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return
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}
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// updateNamespaceStatusFunc will verify that the status of the namespace is correct
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func updateNamespaceStatusFunc(kubeClient clientset.Interface, namespace *api.Namespace) (*api.Namespace, error) {
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if namespace.DeletionTimestamp.IsZero() || namespace.Status.Phase == api.NamespaceTerminating {
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return namespace, nil
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}
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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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return kubeClient.Core().Namespaces().UpdateStatus(&newNamespace)
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}
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// finalized returns true if the namespace.Spec.Finalizers is an 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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// finalizeNamespaceFunc removes the kubernetes token and finalizes the namespace
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func finalizeNamespaceFunc(kubeClient clientset.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 := sets.NewString()
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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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namespace, err := kubeClient.Core().Namespaces().Finalize(&namespaceFinalize)
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if err != nil {
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// it was removed already, so life is good
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if errors.IsNotFound(err) {
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return namespace, nil
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}
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}
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return namespace, err
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}
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// deleteAllContent will delete all content known to the system in a namespace. It returns an estimate
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// of the time remaining before the remaining resources are deleted. If estimate > 0 not all resources
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// are guaranteed to be gone.
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// TODO: this should use discovery to delete arbitrary namespace content
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func deleteAllContent(kubeClient clientset.Interface, versions *unversioned.APIVersions, namespace string, before unversioned.Time) (estimate int64, err error) {
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err = deleteServiceAccounts(kubeClient, namespace)
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if err != nil {
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return estimate, 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 estimate, 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 estimate, err
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}
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estimate, err = deletePods(kubeClient, namespace, before)
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if err != nil {
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return estimate, 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 estimate, 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 estimate, 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 estimate, 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 estimate, 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 estimate, err
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}
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// If experimental mode, delete all experimental resources for the namespace.
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if containsVersion(versions, "extensions/v1beta1") {
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resources, err := kubeClient.Discovery().ServerResourcesForGroupVersion("extensions/v1beta1")
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if err != nil {
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return estimate, err
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}
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if containsResource(resources, "horizontalpodautoscalers") {
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err = deleteHorizontalPodAutoscalers(kubeClient.Extensions(), namespace)
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if err != nil {
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return estimate, err
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}
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}
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if containsResource(resources, "ingresses") {
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err = deleteIngress(kubeClient.Extensions(), namespace)
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if err != nil {
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return estimate, err
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}
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}
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if containsResource(resources, "daemonsets") {
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err = deleteDaemonSets(kubeClient.Extensions(), namespace)
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if err != nil {
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return estimate, err
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}
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}
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if containsResource(resources, "jobs") {
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err = deleteJobs(kubeClient.Extensions(), namespace)
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if err != nil {
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return estimate, err
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}
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}
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if containsResource(resources, "deployments") {
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err = deleteDeployments(kubeClient.Extensions(), namespace)
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if err != nil {
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return estimate, err
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}
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}
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}
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return estimate, nil
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}
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// syncNamespace orchestrates deletion of a Namespace and its associated content.
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func syncNamespace(kubeClient clientset.Interface, versions *unversioned.APIVersions, namespace *api.Namespace) error {
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if namespace.DeletionTimestamp == nil {
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return nil
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}
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// multiple controllers may edit a namespace during termination
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// first get the latest state of the namespace before proceeding
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// if the namespace was deleted already, don't do anything
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namespace, err := kubeClient.Core().Namespaces().Get(namespace.Name)
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if err != nil {
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if errors.IsNotFound(err) {
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return nil
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}
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return err
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}
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glog.V(4).Infof("Syncing namespace %s", namespace.Name)
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// ensure that the status is up to date on the namespace
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// if we get a not found error, we assume the namespace is truly gone
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namespace, err = retryOnConflictError(kubeClient, namespace, updateNamespaceStatusFunc)
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if err != nil {
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if errors.IsNotFound(err) {
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return nil
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}
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return err
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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.Core().Namespaces().Delete(namespace.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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return nil
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}
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// there may still be content for us to remove
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estimate, err := deleteAllContent(kubeClient, versions, namespace.Name, *namespace.DeletionTimestamp)
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if err != nil {
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return err
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}
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if estimate > 0 {
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return &contentRemainingError{estimate}
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}
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// we have removed content, so mark it finalized by us
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result, err := retryOnConflictError(kubeClient, namespace, finalizeNamespaceFunc)
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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.Core().Namespaces().Delete(namespace.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 deleteLimitRanges(kubeClient clientset.Interface, ns string) error {
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return kubeClient.Core().LimitRanges(ns).DeleteCollection(nil, api.ListOptions{})
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}
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func deleteResourceQuotas(kubeClient clientset.Interface, ns string) error {
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return kubeClient.Core().ResourceQuotas(ns).DeleteCollection(nil, api.ListOptions{})
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}
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func deleteServiceAccounts(kubeClient clientset.Interface, ns string) error {
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return kubeClient.Core().ServiceAccounts(ns).DeleteCollection(nil, api.ListOptions{})
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}
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func deleteServices(kubeClient clientset.Interface, ns string) error {
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items, err := kubeClient.Core().Services(ns).List(api.ListOptions{})
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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.Core().Services(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 deleteReplicationControllers(kubeClient clientset.Interface, ns string) error {
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return kubeClient.Core().ReplicationControllers(ns).DeleteCollection(nil, api.ListOptions{})
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}
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func deletePods(kubeClient clientset.Interface, ns string, before unversioned.Time) (int64, error) {
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items, err := kubeClient.Core().Pods(ns).List(api.ListOptions{})
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if err != nil {
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return 0, err
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}
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expired := unversioned.Now().After(before.Time)
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var deleteOptions *api.DeleteOptions
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if expired {
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deleteOptions = api.NewDeleteOptions(0)
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}
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estimate := int64(0)
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for i := range items.Items {
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if items.Items[i].Spec.TerminationGracePeriodSeconds != nil {
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grace := *items.Items[i].Spec.TerminationGracePeriodSeconds
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if grace > estimate {
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estimate = grace
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}
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}
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err := kubeClient.Core().Pods(ns).Delete(items.Items[i].Name, deleteOptions)
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if err != nil && !errors.IsNotFound(err) {
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return 0, err
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}
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}
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if expired {
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estimate = 0
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}
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return estimate, nil
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}
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func deleteEvents(kubeClient clientset.Interface, ns string) error {
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return kubeClient.Core().Events(ns).DeleteCollection(nil, api.ListOptions{})
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}
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func deleteSecrets(kubeClient clientset.Interface, ns string) error {
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return kubeClient.Core().Secrets(ns).DeleteCollection(nil, api.ListOptions{})
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}
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func deletePersistentVolumeClaims(kubeClient clientset.Interface, ns string) error {
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return kubeClient.Core().PersistentVolumeClaims(ns).DeleteCollection(nil, api.ListOptions{})
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}
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func deleteHorizontalPodAutoscalers(expClient extensions_unversioned.ExtensionsInterface, ns string) error {
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return expClient.HorizontalPodAutoscalers(ns).DeleteCollection(nil, api.ListOptions{})
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}
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func deleteDaemonSets(expClient extensions_unversioned.ExtensionsInterface, ns string) error {
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return expClient.DaemonSets(ns).DeleteCollection(nil, api.ListOptions{})
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}
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func deleteJobs(expClient extensions_unversioned.ExtensionsInterface, ns string) error {
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return expClient.Jobs(ns).DeleteCollection(nil, api.ListOptions{})
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}
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func deleteDeployments(expClient extensions_unversioned.ExtensionsInterface, ns string) error {
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return expClient.Deployments(ns).DeleteCollection(nil, api.ListOptions{})
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}
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func deleteIngress(expClient extensions_unversioned.ExtensionsInterface, ns string) error {
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return expClient.Ingresses(ns).DeleteCollection(nil, api.ListOptions{})
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}
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// TODO: this is duplicated logic. Move it somewhere central?
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func containsVersion(versions *unversioned.APIVersions, version string) bool {
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for ix := range versions.Versions {
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if versions.Versions[ix] == version {
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return true
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}
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}
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return false
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}
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// TODO: this is duplicated logic. Move it somewhere central?
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func containsResource(resources *unversioned.APIResourceList, resourceName string) bool {
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if resources == nil {
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return false
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}
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for ix := range resources.APIResources {
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resource := resources.APIResources[ix]
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if resource.Name == resourceName {
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return true
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}
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}
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return false
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}
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