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member_controller.go
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/
member_controller.go
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/*
Copyright (c) Microsoft Corporation.
Licensed under the MIT license.
*/
package internalmembercluster
import (
"context"
"time"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/retry"
"k8s.io/klog/v2"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/builder"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"go.goms.io/fleet/apis"
fleetv1alpha1 "go.goms.io/fleet/apis/v1alpha1"
workapi "go.goms.io/fleet/pkg/controllers/work"
"go.goms.io/fleet/pkg/metrics"
)
// Reconciler reconciles a InternalMemberCluster object in the member cluster.
type Reconciler struct {
hubClient client.Client
memberClient client.Client
// the join/leave agent maintains the list of controllers in the member cluster
// so that it can make sure that all the agents on the member cluster have joined/left
// before updating the internal member cluster CR status
workController *workapi.ApplyWorkReconciler
recorder record.EventRecorder
}
const (
eventReasonInternalMemberClusterHealthy = "InternalMemberClusterHealthy"
eventReasonInternalMemberClusterUnhealthy = "InternalMemberClusterUnhealthy"
eventReasonInternalMemberClusterJoined = "InternalMemberClusterJoined"
eventReasonInternalMemberClusterFailedToJoin = "InternalMemberClusterFailedToJoin"
eventReasonInternalMemberClusterFailedToLeave = "InternalMemberClusterFailedToLeave"
eventReasonInternalMemberClusterLeft = "InternalMemberClusterLeft"
)
// NewReconciler creates a new reconciler for the internalMemberCluster CR
func NewReconciler(hubClient client.Client, memberClient client.Client, workController *workapi.ApplyWorkReconciler) *Reconciler {
return &Reconciler{
hubClient: hubClient,
memberClient: memberClient,
workController: workController,
}
}
func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
klog.V(2).InfoS("Reconcile", "InternalMemberCluster", req.NamespacedName)
var imc fleetv1alpha1.InternalMemberCluster
if err := r.hubClient.Get(ctx, req.NamespacedName, &imc); err != nil {
klog.ErrorS(err, "failed to get internal member cluster: %s", req.NamespacedName)
return ctrl.Result{}, client.IgnoreNotFound(err)
}
switch imc.Spec.State {
case fleetv1alpha1.ClusterStateJoin:
if err := r.startAgents(ctx, &imc); err != nil {
return ctrl.Result{}, err
}
updateMemberAgentHeartBeat(&imc)
updateHealthErr := r.updateHealth(ctx, &imc)
r.markInternalMemberClusterJoined(&imc)
if err := r.updateInternalMemberClusterWithRetry(ctx, &imc); err != nil {
if apierrors.IsConflict(err) {
klog.V(2).InfoS("failed to update status due to conflicts", "imc", klog.KObj(&imc))
} else {
klog.ErrorS(err, "failed to update status", "imc", klog.KObj(&imc))
}
return ctrl.Result{}, client.IgnoreNotFound(err)
}
if updateHealthErr != nil {
klog.ErrorS(updateHealthErr, "failed to update health", "imc", klog.KObj(&imc))
return ctrl.Result{}, updateHealthErr
}
return ctrl.Result{RequeueAfter: time.Second * time.Duration(imc.Spec.HeartbeatPeriodSeconds)}, nil
case fleetv1alpha1.ClusterStateLeave:
if err := r.stopAgents(ctx, &imc); err != nil {
return ctrl.Result{}, err
}
r.markInternalMemberClusterLeft(&imc)
if err := r.updateInternalMemberClusterWithRetry(ctx, &imc); err != nil {
if apierrors.IsConflict(err) {
klog.V(2).InfoS("failed to update status due to conflicts", "imc", klog.KObj(&imc))
} else {
klog.ErrorS(err, "failed to update status", "imc", klog.KObj(&imc))
}
return ctrl.Result{}, client.IgnoreNotFound(err)
}
return ctrl.Result{}, nil
default:
klog.Errorf("encountered a fatal error. unknown state %v in InternalMemberCluster: %s", imc.Spec.State, req.NamespacedName)
return ctrl.Result{}, nil
}
}
// startAgents start all the member agents running on the member cluster
func (r *Reconciler) startAgents(ctx context.Context, imc *fleetv1alpha1.InternalMemberCluster) error {
// TODO: handle all the controllers uniformly if we have more
if err := r.workController.Join(ctx); err != nil {
r.markInternalMemberClusterJoinFailed(imc, err)
// ignore the update error since we will return an error anyway
_ = r.updateInternalMemberClusterWithRetry(ctx, imc)
return err
}
return nil
}
// stopAgents stops all the member agents running on the member cluster
func (r *Reconciler) stopAgents(ctx context.Context, imc *fleetv1alpha1.InternalMemberCluster) error {
// TODO: handle all the controllers uniformly if we have more
if err := r.workController.Leave(ctx); err != nil {
r.markInternalMemberClusterLeaveFailed(imc, err)
// ignore the update error since we will return an error anyway
_ = r.updateInternalMemberClusterWithRetry(ctx, imc)
return err
}
return nil
}
// updateHealth collects and updates member cluster resource stats and set ConditionTypeInternalMemberClusterHealth.
func (r *Reconciler) updateHealth(ctx context.Context, imc *fleetv1alpha1.InternalMemberCluster) error {
klog.V(2).InfoS("updateHealth", "InternalMemberCluster", klog.KObj(imc))
if err := r.updateResourceStats(ctx, imc); err != nil {
r.markInternalMemberClusterUnhealthy(imc, errors.Wrapf(err, "failed to update resource stats %s", klog.KObj(imc)))
return err
}
r.markInternalMemberClusterHealthy(imc)
return nil
}
// updateResourceStats collects and updates resource usage stats of the member cluster.
func (r *Reconciler) updateResourceStats(ctx context.Context, imc *fleetv1alpha1.InternalMemberCluster) error {
klog.V(2).InfoS("updateResourceStats", "InternalMemberCluster", klog.KObj(imc))
var nodes corev1.NodeList
if err := r.memberClient.List(ctx, &nodes); err != nil {
return errors.Wrapf(err, "failed to list nodes for member cluster %s", klog.KObj(imc))
}
var capacityCPU, capacityMemory, allocatableCPU, allocatableMemory resource.Quantity
for _, node := range nodes.Items {
capacityCPU.Add(*(node.Status.Capacity.Cpu()))
capacityMemory.Add(*(node.Status.Capacity.Memory()))
allocatableCPU.Add(*(node.Status.Allocatable.Cpu()))
allocatableMemory.Add(*(node.Status.Allocatable.Memory()))
}
imc.Status.ResourceUsage.Capacity = corev1.ResourceList{
corev1.ResourceCPU: capacityCPU,
corev1.ResourceMemory: capacityMemory,
}
imc.Status.ResourceUsage.Allocatable = corev1.ResourceList{
corev1.ResourceCPU: allocatableCPU,
corev1.ResourceMemory: allocatableMemory,
}
imc.Status.ResourceUsage.ObservationTime = metav1.Now()
return nil
}
// updateInternalMemberClusterWithRetry updates InternalMemberCluster status.
func (r *Reconciler) updateInternalMemberClusterWithRetry(ctx context.Context, imc *fleetv1alpha1.InternalMemberCluster) error {
klog.V(2).InfoS("updateInternalMemberClusterWithRetry", "InternalMemberCluster", klog.KObj(imc))
backOffPeriod := retry.DefaultBackoff
backOffPeriod.Cap = time.Second * time.Duration(imc.Spec.HeartbeatPeriodSeconds)
return retry.OnError(backOffPeriod,
func(err error) bool {
return apierrors.IsServiceUnavailable(err) || apierrors.IsServerTimeout(err) || apierrors.IsTooManyRequests(err)
},
func() error {
return r.hubClient.Status().Update(ctx, imc)
})
}
// updateMemberAgentHeartBeat is used to update member agent heart beat for Internal member cluster.
func updateMemberAgentHeartBeat(imc *fleetv1alpha1.InternalMemberCluster) {
klog.V(2).InfoS("update Internal member cluster heartbeat", "InternalMemberCluster", klog.KObj(imc))
desiredAgentStatus := imc.GetAgentStatus(fleetv1alpha1.MemberAgent)
if desiredAgentStatus != nil {
desiredAgentStatus.LastReceivedHeartbeat = metav1.Now()
}
}
func (r *Reconciler) markInternalMemberClusterHealthy(imc apis.ConditionedAgentObj) {
klog.V(2).InfoS("markInternalMemberClusterHealthy", "InternalMemberCluster", klog.KObj(imc))
newCondition := metav1.Condition{
Type: string(fleetv1alpha1.AgentHealthy),
Status: metav1.ConditionTrue,
Reason: eventReasonInternalMemberClusterHealthy,
ObservedGeneration: imc.GetGeneration(),
}
// Healthy status changed.
existingCondition := imc.GetConditionWithType(fleetv1alpha1.MemberAgent, newCondition.Type)
if existingCondition == nil || existingCondition.Status != newCondition.Status {
klog.V(2).InfoS("healthy", "InternalMemberCluster", klog.KObj(imc))
r.recorder.Event(imc, corev1.EventTypeNormal, eventReasonInternalMemberClusterHealthy, "internal member cluster healthy")
}
imc.SetConditionsWithType(fleetv1alpha1.MemberAgent, newCondition)
}
func (r *Reconciler) markInternalMemberClusterUnhealthy(imc apis.ConditionedAgentObj, err error) {
klog.V(2).InfoS("markInternalMemberClusterUnhealthy", "InternalMemberCluster", klog.KObj(imc))
newCondition := metav1.Condition{
Type: string(fleetv1alpha1.AgentHealthy),
Status: metav1.ConditionFalse,
Reason: eventReasonInternalMemberClusterUnhealthy,
Message: err.Error(),
ObservedGeneration: imc.GetGeneration(),
}
// Healthy status changed.
existingCondition := imc.GetConditionWithType(fleetv1alpha1.MemberAgent, newCondition.Type)
if existingCondition == nil || existingCondition.Status != newCondition.Status {
klog.V(2).InfoS("unhealthy", "InternalMemberCluster", klog.KObj(imc))
r.recorder.Event(imc, corev1.EventTypeWarning, eventReasonInternalMemberClusterUnhealthy, "internal member cluster unhealthy")
}
imc.SetConditionsWithType(fleetv1alpha1.MemberAgent, newCondition)
}
func (r *Reconciler) markInternalMemberClusterJoined(imc apis.ConditionedAgentObj) {
klog.V(2).InfoS("markInternalMemberClusterJoined", "InternalMemberCluster", klog.KObj(imc))
newCondition := metav1.Condition{
Type: string(fleetv1alpha1.AgentJoined),
Status: metav1.ConditionTrue,
Reason: eventReasonInternalMemberClusterJoined,
ObservedGeneration: imc.GetGeneration(),
}
// Joined status changed.
existingCondition := imc.GetConditionWithType(fleetv1alpha1.MemberAgent, newCondition.Type)
if existingCondition == nil || existingCondition.ObservedGeneration != imc.GetGeneration() || existingCondition.Status != newCondition.Status {
r.recorder.Event(imc, corev1.EventTypeNormal, eventReasonInternalMemberClusterJoined, "internal member cluster joined")
klog.V(2).InfoS("joined", "InternalMemberCluster", klog.KObj(imc))
metrics.ReportJoinResultMetric()
}
imc.SetConditionsWithType(fleetv1alpha1.MemberAgent, newCondition)
}
func (r *Reconciler) markInternalMemberClusterJoinFailed(imc apis.ConditionedAgentObj, err error) {
klog.V(2).InfoS("markInternalMemberCluster join failed", "error", err, "InternalMemberCluster", klog.KObj(imc))
newCondition := metav1.Condition{
Type: string(fleetv1alpha1.AgentJoined),
Status: metav1.ConditionUnknown,
Reason: eventReasonInternalMemberClusterFailedToJoin,
Message: err.Error(),
ObservedGeneration: imc.GetGeneration(),
}
// Joined status changed.
existingCondition := imc.GetConditionWithType(fleetv1alpha1.MemberAgent, newCondition.Type)
if existingCondition == nil || existingCondition.ObservedGeneration != imc.GetGeneration() || existingCondition.Status != newCondition.Status {
r.recorder.Event(imc, corev1.EventTypeNormal, eventReasonInternalMemberClusterFailedToJoin, "internal member cluster failed to join")
klog.ErrorS(err, "agent join failed", "InternalMemberCluster", klog.KObj(imc))
}
imc.SetConditionsWithType(fleetv1alpha1.MemberAgent, newCondition)
}
func (r *Reconciler) markInternalMemberClusterLeft(imc apis.ConditionedAgentObj) {
klog.V(2).InfoS("markInternalMemberClusterLeft", "InternalMemberCluster", klog.KObj(imc))
newCondition := metav1.Condition{
Type: string(fleetv1alpha1.AgentJoined),
Status: metav1.ConditionFalse,
Reason: eventReasonInternalMemberClusterLeft,
ObservedGeneration: imc.GetGeneration(),
}
// Joined status changed.
existingCondition := imc.GetConditionWithType(fleetv1alpha1.MemberAgent, newCondition.Type)
if existingCondition == nil || existingCondition.ObservedGeneration != imc.GetGeneration() || existingCondition.Status != newCondition.Status {
r.recorder.Event(imc, corev1.EventTypeNormal, eventReasonInternalMemberClusterLeft, "internal member cluster left")
klog.V(2).InfoS("left", "InternalMemberCluster", klog.KObj(imc))
metrics.ReportLeaveResultMetric()
}
imc.SetConditionsWithType(fleetv1alpha1.MemberAgent, newCondition)
}
func (r *Reconciler) markInternalMemberClusterLeaveFailed(imc apis.ConditionedAgentObj, err error) {
klog.V(2).InfoS("markInternalMemberCluster leave failed", "error", err, "InternalMemberCluster", klog.KObj(imc))
newCondition := metav1.Condition{
Type: string(fleetv1alpha1.AgentJoined),
Status: metav1.ConditionUnknown,
Reason: eventReasonInternalMemberClusterFailedToLeave,
Message: err.Error(),
ObservedGeneration: imc.GetGeneration(),
}
// Joined status changed.
existingCondition := imc.GetConditionWithType(fleetv1alpha1.MemberAgent, newCondition.Type)
if existingCondition == nil || existingCondition.ObservedGeneration != imc.GetGeneration() || existingCondition.Status != newCondition.Status {
r.recorder.Event(imc, corev1.EventTypeNormal, eventReasonInternalMemberClusterFailedToLeave, "internal member cluster failed to leave")
klog.ErrorS(err, "agent leave failed", "InternalMemberCluster", klog.KObj(imc))
}
imc.SetConditionsWithType(fleetv1alpha1.MemberAgent, newCondition)
}
// SetupWithManager sets up the controller with the Manager.
func (r *Reconciler) SetupWithManager(mgr ctrl.Manager) error {
r.recorder = mgr.GetEventRecorderFor("InternalMemberClusterController")
return ctrl.NewControllerManagedBy(mgr).
For(&fleetv1alpha1.InternalMemberCluster{}, builder.WithPredicates(predicate.GenerationChangedPredicate{})).
Complete(r)
}