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checker.go
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/
checker.go
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/*
Copyright 2019 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"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/sets"
"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/metrics"
"sigs.k8s.io/cluster-api-provider-nested/virtualcluster/pkg/syncer/patrol/differ"
"sigs.k8s.io/cluster-api-provider-nested/virtualcluster/pkg/syncer/util"
"sigs.k8s.io/cluster-api-provider-nested/virtualcluster/pkg/syncer/util/featuregate"
utilconstants "sigs.k8s.io/cluster-api-provider-nested/virtualcluster/pkg/util/constants"
mc "sigs.k8s.io/cluster-api-provider-nested/virtualcluster/pkg/util/mccontroller"
)
func (c *controller) StartPatrol(stopCh <-chan struct{}) error {
defer utilruntime.HandleCrash()
if !cache.WaitForCacheSync(stopCh, c.nsSynced, c.vcSynced) {
return fmt.Errorf("failed to wait for caches to sync before starting Namespace checker")
}
c.Patroller.Start(stopCh)
return nil
}
// shouldBeGarbageCollected checks if the owner vc object is deleted or not. If so, the namespace should be garbage collected.
func (c *controller) shouldBeGarbageCollected(ns *corev1.Namespace) bool {
vcName := ns.Annotations[constants.LabelVCName]
vcNamespace := ns.Annotations[constants.LabelVCNamespace]
if vcName == "" || vcNamespace == "" {
return false
}
vc, err := c.vcLister.VirtualClusters(vcNamespace).Get(vcName)
if err != nil {
if apierrors.IsNotFound(err) {
// vc does not exist, double check against the apiserver
if _, apiservererr := c.vcClient.TenancyV1alpha1().VirtualClusters(vcNamespace).Get(vcName, metav1.GetOptions{}); apiservererr != nil {
if apierrors.IsNotFound(apiservererr) {
// vc does not exist in apiserver as well
return true
}
}
}
} else {
// vc exists, check the uid
if ns.Annotations[constants.LabelVCUID] != string(vc.UID) {
if v, err := c.vcClient.TenancyV1alpha1().VirtualClusters(vcNamespace).Get(vcName, metav1.GetOptions{}); err == nil {
if ns.Annotations[constants.LabelVCUID] != string(v.UID) {
// uid is indeed different
return true
}
}
}
klog.V(4).Infof("pNamespace %s's owner vc exists.", ns.Name)
}
return false
}
func (c *controller) PatrollerDo() {
clusterNames := c.MultiClusterController.GetClusterNames()
if len(clusterNames) == 0 {
klog.V(4).Infof("super cluster has no tenant control planes, still check %s for gc purpose", "namespace")
}
pList, err := c.nsLister.List(util.GetSuperClusterListerLabelsSelector())
if err != nil {
klog.Errorf("error listing namespaces from super control plane informer cache: %v", err)
return
}
pSet := differ.NewDiffSet()
for _, p := range pList {
pSet.Insert(differ.ClusterObject{Object: p, Key: p.GetName()})
}
knownClusterSet := sets.NewString(clusterNames...)
vSet := differ.NewDiffSet()
for _, cluster := range clusterNames {
vList := &corev1.NamespaceList{}
if err := c.MultiClusterController.List(cluster, vList); err != nil {
klog.Errorf("error listing namespaces from cluster %s informer cache: %v", cluster, err)
knownClusterSet.Delete(cluster)
continue
}
for i := range vList.Items {
if featuregate.DefaultFeatureGate.Enabled(featuregate.SuperClusterPooling) {
if err := mc.IsNamespaceScheduledToCluster(&vList.Items[i], utilconstants.SuperClusterID); err != nil {
klog.V(4).Infof("skip ns object which is not belongs to this super cluster: %v", err)
continue
}
}
vSet.Insert(differ.ClusterObject{
Object: &vList.Items[i],
OwnerCluster: cluster,
Key: conversion.ToSuperClusterNamespace(cluster, vList.Items[i].GetName()),
})
}
}
d := differ.HandlerFuncs{}
d.AddFunc = func(vObj differ.ClusterObject) {
if err := c.MultiClusterController.RequeueObject(vObj.OwnerCluster, vObj.Object); err != nil {
klog.Errorf("error requeue vNamespace %v in cluster %s: %v", vObj.GetName(), vObj.GetOwnerCluster(), err)
} else {
metrics.CheckerRemedyStats.WithLabelValues("RequeuedTenantNamespaces").Inc()
}
}
d.UpdateFunc = func(vObj, pObj differ.ClusterObject) {
v := vObj.Object.(*corev1.Namespace)
p := pObj.Object.(*corev1.Namespace)
// if vc object is deleted, we should reach here
if c.shouldBeGarbageCollected(p) || p.Annotations[constants.LabelUID] != string(v.UID) {
c.deleteNamespace(p)
return
}
vc, err := util.GetVirtualClusterObject(c.MultiClusterController, vObj.GetOwnerCluster())
if err != nil {
klog.Errorf("fail to get cluster spec : %s", vObj.GetOwnerCluster())
return
}
updatedNamespace := conversion.Equality(c.Config, vc).CheckNamespaceEquality(p, v)
if updatedNamespace != nil {
klog.Warningf("metadata of namespace %s diff in super&tenant cluster", pObj.Key)
d.OnAdd(vObj)
}
}
d.DeleteFunc = func(pObj differ.ClusterObject) {
p := pObj.Object.(*corev1.Namespace)
// only delete the root ns if vc is gone
if p.Annotations[constants.LabelVCRootNS] == "true" {
if c.shouldBeGarbageCollected(p) {
c.deleteNamespace(p)
}
return
}
clusterName, _ := conversion.GetVirtualOwner(p)
// most possible case. vc is loaded and tenant ns is missing
if knownClusterSet.Has(clusterName) {
c.deleteNamespace(p)
return
}
// vc status is unknown or not loaded. confirm for gc purpose
if c.shouldBeGarbageCollected(p) {
c.deleteNamespace(p)
return
}
}
vSet.Difference(pSet, differ.FilteringHandler{
Handler: d,
FilterFunc: func(obj differ.ClusterObject) bool {
// vObj
if obj.OwnerCluster != "" {
return true
}
if obj.OwnerCluster == "" && obj.GetAnnotations()[constants.LabelVCRootNS] == "true" {
return true
}
// pObj
clusterName, vNamespace := conversion.GetVirtualOwner(obj)
if clusterName != "" && vNamespace != "" {
return true
}
return false
},
})
}
func (c *controller) deleteNamespace(ns *corev1.Namespace) {
deleteOptions := &metav1.DeleteOptions{}
deleteOptions.Preconditions = metav1.NewUIDPreconditions(string(ns.GetUID()))
if err := c.namespaceClient.Namespaces().Delete(context.TODO(), ns.GetName(), *deleteOptions); err != nil {
klog.Errorf("error deleting pNamespace %s in super control plane: %v", ns.GetName(), err)
} else {
metrics.CheckerRemedyStats.WithLabelValues("DeletedOrphanSuperControlPlaneNamespaces").Inc()
}
}