/
member_clusterset_controller.go
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/
member_clusterset_controller.go
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/*
Copyright 2021 Antrea 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 multicluster
import (
"context"
"fmt"
"sync"
"time"
"go.uber.org/multierr"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/klog/v2"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
multiclusterv1alpha1 "antrea.io/antrea/multicluster/apis/multicluster/v1alpha1"
"antrea.io/antrea/multicluster/controllers/multicluster/common"
"antrea.io/antrea/multicluster/controllers/multicluster/commonarea"
)
// MemberClusterSetReconciler reconciles a ClusterSet object in the member cluster deployment.
type MemberClusterSetReconciler struct {
client.Client
Scheme *runtime.Scheme
Namespace string
mutex sync.Mutex
clusterSetConfig *multiclusterv1alpha1.ClusterSet
clusterSetID common.ClusterSetID
clusterID common.ClusterID
RemoteCommonAreaManager commonarea.RemoteCommonAreaManager
}
//+kubebuilder:rbac:groups=multicluster.crd.antrea.io,resources=clustersets,verbs=get;list;watch;create;update;patch;delete
//+kubebuilder:rbac:groups=multicluster.crd.antrea.io,resources=clustersets/status,verbs=get;update;patch
//+kubebuilder:rbac:groups=multicluster.crd.antrea.io,resources=clustersets/finalizers,verbs=update
// Reconcile ClusterSet changes
func (r *MemberClusterSetReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
if req.Namespace != r.Namespace {
klog.V(2).InfoS("Skip reconciling ClusterSet", "clusterset", req.String())
return ctrl.Result{}, nil
}
clusterSet := &multiclusterv1alpha1.ClusterSet{}
err := r.Get(ctx, req.NamespacedName, clusterSet)
defer r.mutex.Unlock()
r.mutex.Lock()
if err != nil {
if !errors.IsNotFound(err) {
return ctrl.Result{}, err
}
klog.InfoS("Received ClusterSet delete", "config", klog.KObj(clusterSet))
stopErr := r.RemoteCommonAreaManager.Stop()
r.RemoteCommonAreaManager = nil
r.clusterSetConfig = nil
r.clusterID = common.InvalidClusterID
r.clusterSetID = common.InvalidClusterSetID
return ctrl.Result{}, stopErr
}
klog.InfoS("Received ClusterSet add/update", "config", klog.KObj(clusterSet))
// Handle create or update
if r.clusterSetConfig == nil {
// If create, make sure the local ClusterClaim is part of the member config
clusterId, clusterSetId, err := validateLocalClusterClaim(r.Client, clusterSet)
if err != nil {
return ctrl.Result{}, err
}
if err = validateConfigExists(clusterId, clusterSet.Spec.Members); err != nil {
err = fmt.Errorf("local cluster %s is not defined as member in ClusterSet", clusterId)
return ctrl.Result{}, err
}
r.clusterID = clusterId
r.clusterSetID = clusterSetId
} else {
if string(r.clusterSetID) != clusterSet.Name {
return ctrl.Result{}, fmt.Errorf("ClusterSet Name %s cannot be changed to %s",
r.clusterSetID, req.Name)
}
}
r.clusterSetConfig = clusterSet.DeepCopy()
// handle create and update
err = r.updateMultiClusterSetOnMemberCluster(clusterSet)
if err != nil {
return ctrl.Result{}, err
}
return ctrl.Result{}, nil
}
// SetupWithManager sets up the controller with the Manager.
func (r *MemberClusterSetReconciler) SetupWithManager(mgr ctrl.Manager) error {
// Update status periodically
go func() {
for {
<-time.After(time.Second * 30)
r.updateStatus()
}
}()
return ctrl.NewControllerManagedBy(mgr).
For(&multiclusterv1alpha1.ClusterSet{}).
WithOptions(controller.Options{
MaxConcurrentReconciles: common.DefaultWorkerCount,
}).
Complete(r)
}
func (r *MemberClusterSetReconciler) updateMultiClusterSetOnMemberCluster(clusterSet *multiclusterv1alpha1.ClusterSet) error {
if r.RemoteCommonAreaManager == nil {
r.RemoteCommonAreaManager = commonarea.NewRemoteCommonAreaManager(r.clusterSetID, r.clusterID)
err := r.RemoteCommonAreaManager.Start()
if err != nil {
klog.ErrorS(err, "error starting RemoteCommonAreaManager")
r.RemoteCommonAreaManager = nil
r.clusterSetID = common.InvalidClusterSetID
r.clusterID = common.InvalidClusterID
r.clusterSetConfig = nil
return err
}
}
currentLeaders := r.RemoteCommonAreaManager.GetRemoteCommonAreas()
newLeaders := clusterSet.Spec.Leaders
var addedLeaders []*multiclusterv1alpha1.MemberCluster
var removedLeaders map[common.ClusterID]commonarea.RemoteCommonArea
for _, leader := range newLeaders {
leaderID := common.ClusterID(leader.ClusterID)
_, found := currentLeaders[leaderID]
if !found {
addedLeaders = append(addedLeaders, leader.DeepCopy())
} else {
// In the end currentLeaders will only have removed leaders
delete(currentLeaders, leaderID)
// TODO: Leader is updated, the leader url or secret could have changed,
// so, we need to recreate the RemoteCommonArea.
}
}
klog.InfoS("ClusterSet update", "addedLeaders", addedLeaders, "removedLeaders", removedLeaders)
var multiErr error
for _, addedLeader := range addedLeaders {
clusterID := common.ClusterID(addedLeader.ClusterID)
url := addedLeader.Server
secretName := addedLeader.Secret
klog.InfoS("Creating RemoteCommonArea", "Cluster", clusterID)
// Read secret to access the leader cluster. Assume secret is present in the same Namespace as the ClusterSet.
secret, err := r.getSecretForLeader(secretName, clusterSet.GetNamespace())
if err == nil {
_, err = commonarea.NewRemoteCommonArea(clusterID, r.clusterSetID, url, secret, r.Scheme,
r.Client, r.RemoteCommonAreaManager, clusterSet.Spec.Namespace)
}
if err != nil {
klog.ErrorS(err, "Unable to create RemoteCommonArea", "Cluster", clusterID)
} else {
klog.InfoS("Created RemoteCommonArea", "Cluster", clusterID)
}
multiErr = multierr.Append(multiErr, err)
}
removedLeaders = currentLeaders
for _, remoteCommonArea := range removedLeaders {
r.RemoteCommonAreaManager.RemoveRemoteCommonArea(remoteCommonArea)
klog.InfoS("Deleted RemoteCommonArea", "Cluster", remoteCommonArea.GetClusterID())
}
return multiErr
}
// getSecretForLeader returns the Secret associated with this local cluster(which is a member)
// for the given leader.
// When a member is added to a ClusterSet, a specific ServiceAccount is created on the
// leader cluster which allows the member access into the CommonArea. This ServiceAccount
// has an associated Secret which must be copied into the member cluster as an opaque secret.
// Name of this secret is part of the ClusterSet spec for this leader. This method reads
// the Secret given by that name.
func (r *MemberClusterSetReconciler) getSecretForLeader(secretName string, secretNs string) (secretObj *v1.Secret, err error) {
secretObj = &v1.Secret{}
secretNamespacedName := types.NamespacedName{
Namespace: secretNs,
Name: secretName,
}
if err = r.Get(context.TODO(), secretNamespacedName, secretObj); err != nil {
klog.ErrorS(err, "Error reading secret", "Name", secretName, "Namespace", secretNs)
return
}
return
}
func (r *MemberClusterSetReconciler) updateStatus() {
defer r.mutex.Unlock()
r.mutex.Lock()
if r.clusterSetConfig == nil {
// Nothing to do.
return
}
status := multiclusterv1alpha1.ClusterSetStatus{}
status.TotalClusters = int32(len(r.clusterSetConfig.Spec.Members) + len(r.clusterSetConfig.Spec.Leaders))
status.ObservedGeneration = r.clusterSetConfig.Generation
status.ClusterStatuses = r.RemoteCommonAreaManager.GetMemberClusterStatues()
overallCondition := multiclusterv1alpha1.ClusterSetCondition{
Type: multiclusterv1alpha1.ClusterSetReady,
Status: v1.ConditionUnknown,
Message: "Leader not yet elected",
Reason: "",
LastTransitionTime: metav1.Now(),
}
readyClusters := 0
for _, cluster := range status.ClusterStatuses {
connected := false
isLeader := false
for _, condition := range cluster.Conditions {
switch condition.Type {
case multiclusterv1alpha1.ClusterReady:
{
if condition.Status == v1.ConditionTrue {
connected = true
readyClusters += 1
}
}
case multiclusterv1alpha1.ClusterIsElectedLeader:
{
if condition.Status == v1.ConditionTrue {
isLeader = true
}
}
}
}
if connected && isLeader {
overallCondition.Status = v1.ConditionTrue
overallCondition.Message = ""
overallCondition.Reason = ""
}
}
if readyClusters == 0 {
overallCondition.Status = v1.ConditionFalse
overallCondition.LastTransitionTime = metav1.Now()
overallCondition.Message = "Disconnected from all leaders"
}
status.ReadyClusters = int32(readyClusters)
namespacedName := types.NamespacedName{
Namespace: r.clusterSetConfig.Namespace,
Name: r.clusterSetConfig.Name,
}
clusterSet := &multiclusterv1alpha1.ClusterSet{}
err := r.Get(context.TODO(), namespacedName, clusterSet)
if err != nil {
klog.ErrorS(err, "failed to read ClusterSet", "Name", namespacedName)
}
status.Conditions = clusterSet.Status.Conditions
if (len(clusterSet.Status.Conditions) == 1 && clusterSet.Status.Conditions[0].Status != overallCondition.Status) ||
len(clusterSet.Status.Conditions) == 0 {
status.Conditions = []multiclusterv1alpha1.ClusterSetCondition{overallCondition}
}
clusterSet.Status = status
err = r.Status().Update(context.TODO(), clusterSet)
if err != nil {
klog.ErrorS(err, "failed to update Status of ClusterSet", "Name", namespacedName)
}
}