mirror of
https://github.com/edgelesssys/constellation.git
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256 lines
9.2 KiB
Go
256 lines
9.2 KiB
Go
/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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package controllers
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import (
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"context"
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"time"
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node "github.com/edgelesssys/constellation/operators/constellation-node-operator/internal/node"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/client-go/util/retry"
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"k8s.io/utils/clock"
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ctrl "sigs.k8s.io/controller-runtime"
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"sigs.k8s.io/controller-runtime/pkg/builder"
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"sigs.k8s.io/controller-runtime/pkg/client"
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"sigs.k8s.io/controller-runtime/pkg/event"
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"sigs.k8s.io/controller-runtime/pkg/handler"
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"sigs.k8s.io/controller-runtime/pkg/log"
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"sigs.k8s.io/controller-runtime/pkg/predicate"
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"sigs.k8s.io/controller-runtime/pkg/reconcile"
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"sigs.k8s.io/controller-runtime/pkg/source"
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updatev1alpha1 "github.com/edgelesssys/constellation/operators/constellation-node-operator/api/v1alpha1"
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)
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const (
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nodeNameKey = ".spec.nodeName"
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defaultCheckInterval = 30 * time.Second
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)
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// PendingNodeReconciler reconciles a PendingNode object.
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type PendingNodeReconciler struct {
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nodeStateGetter
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client.Client
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Scheme *runtime.Scheme
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clock.Clock
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}
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// NewPendingNodeReconciler creates a new PendingNodeReconciler.
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func NewPendingNodeReconciler(nodeStateGetter nodeStateGetter, client client.Client, scheme *runtime.Scheme) *PendingNodeReconciler {
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return &PendingNodeReconciler{
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nodeStateGetter: nodeStateGetter,
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Client: client,
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Scheme: scheme,
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Clock: clock.RealClock{},
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}
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}
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//+kubebuilder:rbac:groups=update.edgeless.systems,resources=pendingnodes,verbs=get;list;watch;create;update;patch;delete
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//+kubebuilder:rbac:groups=update.edgeless.systems,resources=pendingnodes/status,verbs=get;update;patch
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//+kubebuilder:rbac:groups=update.edgeless.systems,resources=pendingnodes/finalizers,verbs=update
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//+kubebuilder:rbac:groups="",resources=nodes,verbs=get;list;watch
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//+kubebuilder:rbac:groups="",resources=nodes/status,verbs=get
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// Reconcile observes the state of a pending node that is either trying to join the cluster or is leaving the cluster (waiting to be destroyed).
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// If the node is trying to join the cluster and fails to join within the deadline referenced in the PendingNode spec, the node is deleted.
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func (r *PendingNodeReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
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logr := log.FromContext(ctx)
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var pendingNode updatev1alpha1.PendingNode
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if err := r.Get(ctx, req.NamespacedName, &pendingNode); err != nil {
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if !errors.IsNotFound(err) {
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logr.Error(err, "Unable to fetch PendingNode")
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}
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return ctrl.Result{}, client.IgnoreNotFound(err)
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}
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nodeState, err := r.GetNodeState(ctx, pendingNode.Spec.ProviderID)
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if err != nil {
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logr.Error(err, "Unable to get node state")
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return ctrl.Result{Requeue: true}, err
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}
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done, err := r.reachedGoal(ctx, pendingNode, nodeState)
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if err != nil {
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logr.Error(err, "Unable to check if node reached goal")
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return ctrl.Result{}, err
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}
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status := updatev1alpha1.PendingNodeStatus{
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CSPNodeState: nodeState,
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ReachedGoal: done,
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}
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if err := r.tryUpdateStatus(ctx, req.NamespacedName, &pendingNode, status); err != nil {
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return ctrl.Result{}, client.IgnoreNotFound(err)
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}
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if done {
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logr.Info("Reached goal", "pendingNodeGoal", pendingNode.Spec.Goal, "cspNodeState", nodeState)
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if pendingNode.Spec.Goal == updatev1alpha1.NodeGoalLeave {
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// delete self after pending node has been terminated successfully
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if err := r.deletePendingNode(ctx, req.NamespacedName); err != nil {
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return ctrl.Result{}, err
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}
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logr.Info("Deleted pending node resource for terminated node", "pendingNode", req.Name)
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}
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return ctrl.Result{}, nil
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}
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// check if the deadline has been reached
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// requeue if not
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if pendingNode.Spec.Deadline == nil || r.Now().Before(pendingNode.Spec.Deadline.Time) {
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var requeueAfter time.Duration
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if pendingNode.Spec.Deadline == nil {
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requeueAfter = defaultCheckInterval
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} else {
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requeueAfter = pendingNode.Spec.Deadline.Time.Sub(r.Now())
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}
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return ctrl.Result{
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RequeueAfter: requeueAfter,
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}, nil
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}
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// deadline has been reached
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switch pendingNode.Spec.Goal {
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case updatev1alpha1.NodeGoalJoin:
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logr.Info("Node did not get ready in time or failed to join", "pendingNode", pendingNode.Spec.NodeName, "pendingNodeGoal", pendingNode.Spec.Goal, "cspNodeState", nodeState)
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if err := r.DeleteNode(ctx, pendingNode.Spec.ProviderID); err != nil {
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logr.Error(err, "Unable to delete node")
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return ctrl.Result{}, err
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}
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pendingNode.Spec.Goal = updatev1alpha1.NodeGoalLeave
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pendingNode.Spec.Deadline = nil
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if err := r.Update(ctx, &pendingNode); err != nil {
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logr.Error(err, "Unable to update PendingNode")
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return ctrl.Result{}, err
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}
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return ctrl.Result{Requeue: true}, nil
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case updatev1alpha1.NodeGoalLeave:
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logr.Info("Node was not terminated on time", "pendingNodeGoal", pendingNode.Spec.Goal, "cspNodeState", nodeState)
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// TODO: decide if other actions should be taken here (e.g. send another request to delete node)
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return ctrl.Result{RequeueAfter: defaultCheckInterval}, nil
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}
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return ctrl.Result{}, nil
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}
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// SetupWithManager sets up the controller with the Manager.
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func (r *PendingNodeReconciler) SetupWithManager(mgr ctrl.Manager) error {
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// index pending nodes by nodename.
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if err := mgr.GetFieldIndexer().IndexField(context.Background(), &updatev1alpha1.PendingNode{}, nodeNameKey, func(rawObj client.Object) []string {
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pendingNode := rawObj.(*updatev1alpha1.PendingNode)
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return []string{pendingNode.Spec.NodeName}
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}); err != nil {
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return err
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}
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return ctrl.NewControllerManagedBy(mgr).
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For(&updatev1alpha1.PendingNode{}).
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Watches(
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&source.Kind{Type: &corev1.Node{}},
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handler.EnqueueRequestsFromMapFunc(r.findObjectsForNode),
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builder.WithPredicates(nodeStateChangePredicate()),
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).
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Complete(r)
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}
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// nodeStateChangePredicate filters events on Node resources to those that indicate
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// joining, leaving, node becoming ready or node receiving a provider id.
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func nodeStateChangePredicate() predicate.Predicate {
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return predicate.Funcs{
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CreateFunc: func(e event.CreateEvent) bool {
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return true
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},
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UpdateFunc: func(e event.UpdateEvent) bool {
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oldNode, ok := e.ObjectOld.(*corev1.Node)
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if !ok {
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return false
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}
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newNode, ok := e.ObjectNew.(*corev1.Node)
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if !ok {
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return false
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}
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becameReady := !node.Ready(oldNode) && node.Ready(newNode)
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receivedProviderID := len(oldNode.Spec.ProviderID) == 0 && len(newNode.Spec.ProviderID) != 0
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return becameReady || receivedProviderID
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},
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DeleteFunc: func(e event.DeleteEvent) bool {
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return true
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},
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GenericFunc: func(e event.GenericEvent) bool {
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return false
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},
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}
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}
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// findObjectsForNode requests reconciliation for PendingNode whenever the corresponding Node state changes.
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func (r *PendingNodeReconciler) findObjectsForNode(rawNode client.Object) []reconcile.Request {
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var pendingNodesList updatev1alpha1.PendingNodeList
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err := r.List(context.Background(), &pendingNodesList, client.MatchingFields{nodeNameKey: rawNode.GetName()})
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if err != nil {
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return []reconcile.Request{}
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}
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requests := make([]reconcile.Request, len(pendingNodesList.Items))
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for i, item := range pendingNodesList.Items {
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requests[i] = reconcile.Request{
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NamespacedName: types.NamespacedName{
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Name: item.GetName(),
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},
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}
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}
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return requests
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}
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// reachedGoal checks if a pending node has reached its goal (joining or leaving the cluster).
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// - joining node: CSP reports the node instance as running and node has joined kubernetes cluster.
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// - leaving node: CSP reports node instance as terminated.
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func (r *PendingNodeReconciler) reachedGoal(ctx context.Context, pendingNode updatev1alpha1.PendingNode, nodeState updatev1alpha1.CSPNodeState) (bool, error) {
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if pendingNode.Spec.Goal == updatev1alpha1.NodeGoalJoin {
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if err := r.Get(ctx, types.NamespacedName{Name: pendingNode.Spec.NodeName}, &corev1.Node{}); err != nil {
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return false, client.IgnoreNotFound(err)
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}
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return nodeState == updatev1alpha1.NodeStateReady, nil
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}
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return nodeState == updatev1alpha1.NodeStateTerminated, nil
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}
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// deletePendingNode deletes a PendingNode resource.
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func (r *PendingNodeReconciler) deletePendingNode(ctx context.Context, name types.NamespacedName) error {
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return retry.RetryOnConflict(retry.DefaultRetry, func() error {
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var pendingNode updatev1alpha1.PendingNode
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if err := r.Get(ctx, name, &pendingNode); err != nil {
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return err
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}
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return r.Delete(ctx, &pendingNode)
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})
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}
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// tryUpdateStatus attempts to update the PendingNode status field in a retry loop.
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func (r *PendingNodeReconciler) tryUpdateStatus(ctx context.Context, name types.NamespacedName, pendingNode *updatev1alpha1.PendingNode, status updatev1alpha1.PendingNodeStatus) error {
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return retry.RetryOnConflict(retry.DefaultRetry, func() error {
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if err := r.Get(ctx, name, pendingNode); err != nil {
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return err
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}
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pendingNode.Status = *status.DeepCopy()
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if err := r.Status().Update(ctx, pendingNode); err != nil {
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return err
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}
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return nil
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})
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}
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type nodeStateGetter interface {
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// GetNodeState retrieves the state of a pending node from a CSP.
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GetNodeState(ctx context.Context, providerID string) (updatev1alpha1.CSPNodeState, error)
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// DeleteNode starts the termination of the node at the CSP.
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DeleteNode(ctx context.Context, providerID string) error
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}
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