generated from kubernetes/kubernetes-template-project
/
dws.go
139 lines (124 loc) · 5.26 KB
/
dws.go
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/*
Copyright 2020 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package namespace
import (
"context"
"fmt"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/klog/v2"
"sigs.k8s.io/cluster-api-provider-nested/virtualcluster/pkg/syncer/constants"
"sigs.k8s.io/cluster-api-provider-nested/virtualcluster/pkg/syncer/conversion"
"sigs.k8s.io/cluster-api-provider-nested/virtualcluster/pkg/syncer/util"
"sigs.k8s.io/cluster-api-provider-nested/virtualcluster/pkg/syncer/util/featuregate"
"sigs.k8s.io/cluster-api-provider-nested/virtualcluster/pkg/util/reconciler"
)
func (c *controller) StartDWS(stopCh <-chan struct{}) error {
if !cache.WaitForCacheSync(stopCh, c.nsSynced) {
return fmt.Errorf("failed to wait for caches to sync")
}
return c.MultiClusterController.Start(stopCh)
}
// The reconcile logic for tenant control plane namespace informer
func (c *controller) Reconcile(request reconciler.Request) (reconciler.Result, error) {
klog.V(4).Infof("reconcile namespace %s for cluster %s", request.Name, request.ClusterName)
targetNamespace := conversion.ToSuperClusterNamespace(request.ClusterName, request.Name)
pNamespace, err := c.nsLister.Get(targetNamespace)
pExists := true
if err != nil {
if !apierrors.IsNotFound(err) {
return reconciler.Result{Requeue: true}, err
}
pExists = false
}
vExists := true
vNamespace := &corev1.Namespace{}
if err := c.MultiClusterController.Get(request.ClusterName, request.Namespace, request.Name, vNamespace); err != nil {
if !apierrors.IsNotFound(err) {
return reconciler.Result{Requeue: true}, err
}
vExists = false
}
switch {
case vExists && !pExists:
err := c.reconcileNamespaceCreate(request.ClusterName, targetNamespace, vNamespace)
if err != nil {
klog.Errorf("failed reconcile namespace %s CREATE of cluster %s %v", request.Name, request.ClusterName, err)
return reconciler.Result{Requeue: true}, err
}
case !vExists && pExists:
err := c.reconcileNamespaceRemove(request.ClusterName, targetNamespace, request.UID, pNamespace)
if err != nil {
klog.Errorf("failed reconcile namespace %s DELETE of cluster %s %v", request.Name, request.ClusterName, err)
return reconciler.Result{Requeue: true}, err
}
case vExists && pExists:
err := c.reconcileNamespaceUpdate(request.ClusterName, targetNamespace, request.UID, pNamespace, vNamespace)
if err != nil {
klog.Errorf("failed reconcile namespace %s UPDATE of cluster %s %v", request.Name, request.ClusterName, err)
return reconciler.Result{Requeue: true}, err
}
default:
// object is gone.
}
return reconciler.Result{}, nil
}
func (c *controller) reconcileNamespaceCreate(clusterName, targetNamespace string, vNamespace *corev1.Namespace) error {
newObj, err := c.Conversion().BuildSuperClusterNamespace(clusterName, vNamespace)
if err != nil {
return err
}
_, err = c.namespaceClient.Namespaces().Create(context.TODO(), newObj.(*corev1.Namespace), metav1.CreateOptions{})
if apierrors.IsAlreadyExists(err) {
klog.Infof("namespace %s of cluster %s already exist in super control plane", targetNamespace, clusterName)
return nil
}
return err
}
func (c *controller) reconcileNamespaceUpdate(clusterName, targetNamespace, requestUID string, pNamespace, vNamespace *corev1.Namespace) error {
if pNamespace.Annotations[constants.LabelUID] != requestUID {
return fmt.Errorf("pNamespace %s exists but its delegated UID is different", targetNamespace)
}
// update namespace meta is a generic operation, guarded by SuperClusterPooling for now
if featuregate.DefaultFeatureGate.Enabled(featuregate.SuperClusterPooling) {
vc, err := util.GetVirtualClusterObject(c.MultiClusterController, clusterName)
if err != nil {
return err
}
updatedNamespace := conversion.Equality(c.Config, vc).CheckNamespaceEquality(pNamespace, vNamespace)
if updatedNamespace != nil {
_, err = c.namespaceClient.Namespaces().Update(context.TODO(), updatedNamespace, metav1.UpdateOptions{})
if err != nil {
return err
}
}
}
return nil
}
func (c *controller) reconcileNamespaceRemove(clusterName, targetNamespace, requestUID string, pNamespace *corev1.Namespace) error {
if pNamespace.Annotations[constants.LabelUID] != requestUID {
return fmt.Errorf("to be deleted pNamespace %s delegated UID is different from deleted object", targetNamespace)
}
opts := &metav1.DeleteOptions{
PropagationPolicy: &constants.DefaultDeletionPolicy,
Preconditions: metav1.NewUIDPreconditions(string(pNamespace.UID)),
}
err := c.namespaceClient.Namespaces().Delete(context.TODO(), targetNamespace, *opts)
if apierrors.IsNotFound(err) {
klog.Warningf("namespace %s of cluster %s not found in super control plane", targetNamespace, clusterName)
return nil
}
return err
}