mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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104 lines
2.9 KiB
Go
104 lines
2.9 KiB
Go
/*
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Copyright 2023 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 systemnamespaces
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import (
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"context"
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"fmt"
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"time"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/util/wait"
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coreinformers "k8s.io/client-go/informers/core/v1"
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"k8s.io/client-go/kubernetes"
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listers "k8s.io/client-go/listers/core/v1"
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"k8s.io/client-go/tools/cache"
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"k8s.io/klog/v2"
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)
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// Controller ensure system namespaces exist.
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type Controller struct {
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client kubernetes.Interface
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namespaceLister listers.NamespaceLister
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namespaceSynced cache.InformerSynced
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systemNamespaces []string
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interval time.Duration
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}
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// NewController creates a new Controller to ensure system namespaces exist.
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func NewController(systemNamespaces []string, clientset kubernetes.Interface, namespaceInformer coreinformers.NamespaceInformer) *Controller {
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interval := 1 * time.Minute
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return &Controller{
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client: clientset,
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namespaceLister: namespaceInformer.Lister(),
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namespaceSynced: namespaceInformer.Informer().HasSynced,
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systemNamespaces: systemNamespaces,
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interval: interval,
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}
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}
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// Run starts one worker.
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func (c *Controller) Run(stopCh <-chan struct{}) {
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defer utilruntime.HandleCrash()
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defer klog.Infof("Shutting down system namespaces controller")
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klog.Infof("Starting system namespaces controller")
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if !cache.WaitForCacheSync(stopCh, c.namespaceSynced) {
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utilruntime.HandleError(fmt.Errorf("timed out waiting for caches to sync"))
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return
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}
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go wait.Until(c.sync, c.interval, stopCh)
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<-stopCh
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}
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func (c *Controller) sync() {
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// Loop the system namespace list, and create them if they do not exist
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for _, ns := range c.systemNamespaces {
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if err := c.createNamespaceIfNeeded(ns); err != nil {
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utilruntime.HandleError(fmt.Errorf("unable to create required kubernetes system Namespace %s: %v", ns, err))
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}
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}
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}
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func (c *Controller) createNamespaceIfNeeded(ns string) error {
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if _, err := c.namespaceLister.Get(ns); err == nil {
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// the namespace already exists
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return nil
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}
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newNs := &v1.Namespace{
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ObjectMeta: metav1.ObjectMeta{
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Name: ns,
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Namespace: "",
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},
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}
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_, err := c.client.CoreV1().Namespaces().Create(context.TODO(), newNs, metav1.CreateOptions{})
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if err != nil && errors.IsAlreadyExists(err) {
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err = nil
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}
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return err
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}
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