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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| /* | ||
| 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 volume | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
||
| "github.com/aws/karpenter/pkg/utils/injection" | ||
| "github.com/aws/karpenter/pkg/utils/pod" | ||
| v1 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/api/errors" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| "knative.dev/pkg/logging" | ||
|
|
||
| controllerruntime "sigs.k8s.io/controller-runtime" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| "sigs.k8s.io/controller-runtime/pkg/handler" | ||
| "sigs.k8s.io/controller-runtime/pkg/manager" | ||
| "sigs.k8s.io/controller-runtime/pkg/reconcile" | ||
| "sigs.k8s.io/controller-runtime/pkg/source" | ||
| ) | ||
|
|
||
| const ( | ||
| controllerName = "volume" | ||
| selectedNodeAnnotation = "volume.kubernetes.io/selected-node" | ||
| ) | ||
|
|
||
| // Controller for the resource | ||
| type Controller struct { | ||
| kubeClient client.Client | ||
| } | ||
|
|
||
| // NewController is a constructor | ||
| func NewController(kubeClient client.Client) *Controller { | ||
| return &Controller{kubeClient: kubeClient} | ||
| } | ||
|
|
||
| // Register the controller to the manager | ||
| func (c *Controller) Register(ctx context.Context, m manager.Manager) error { | ||
| return controllerruntime. | ||
| NewControllerManagedBy(m). | ||
| Named(controllerName). | ||
| For(&v1.PersistentVolumeClaim{}). | ||
| Watches(&source.Kind{Type: &v1.Pod{}}, handler.EnqueueRequestsFromMapFunc(c.pvcForPod)). | ||
| Complete(c) | ||
| } | ||
|
|
||
| // Reconcile a control loop for the resource | ||
| func (c *Controller) Reconcile(ctx context.Context, req reconcile.Request) (reconcile.Result, error) { | ||
| ctx = logging.WithLogger(ctx, logging.FromContext(ctx).Named(controllerName).With("resource", req.String())) | ||
| ctx = injection.WithNamespacedName(ctx, req.NamespacedName) | ||
| ctx = injection.WithControllerName(ctx, controllerName) | ||
|
|
||
| logging.FromContext(ctx).Info("Reconciling pvc", req.Name) | ||
| pvc := &v1.PersistentVolumeClaim{} | ||
| if err := c.kubeClient.Get(ctx, req.NamespacedName, pvc); err != nil { | ||
| if errors.IsNotFound(err) { | ||
| return reconcile.Result{}, nil | ||
| } | ||
| return reconcile.Result{}, err | ||
| } | ||
| if _, ok := pvc.Annotations[selectedNodeAnnotation]; ok { | ||
| return reconcile.Result{}, nil | ||
| } | ||
| pod, err := c.podForPvc(ctx, pvc) | ||
| if err != nil { | ||
| return reconcile.Result{}, err | ||
| } | ||
| if pod == nil { | ||
| logging.FromContext(ctx).Debugf("Skipping bind, no pod found for persistent volume claim") | ||
| return reconcile.Result{}, nil | ||
| } | ||
| if !c.isBindable(pod) { | ||
| logging.FromContext(ctx).Debugf("Skipping bind, pod %s/%s is not pending", pod.Namespace, pod.Name) | ||
| return reconcile.Result{}, nil | ||
| } | ||
| pvc.Annotations[selectedNodeAnnotation] = pod.Spec.NodeName | ||
| if err := c.kubeClient.Update(ctx, pvc); err != nil { | ||
| return reconcile.Result{}, fmt.Errorf("binding persistent volume claim to node %q, %w", pod.Spec.NodeName, err) | ||
| } | ||
| logging.FromContext(ctx).Infof("Bound persistent volume claim to node %s", pod.Spec.NodeName) | ||
| return reconcile.Result{}, nil | ||
| } | ||
|
|
||
| func (c *Controller) podForPvc(ctx context.Context, pvc *v1.PersistentVolumeClaim) (*v1.Pod, error) { | ||
| pods := &v1.PodList{} | ||
| if err := c.kubeClient.List(ctx, pods, client.InNamespace(pvc.Namespace)); err != nil { | ||
| return nil, err | ||
| } | ||
| for _, pod := range pods.Items { | ||
| for _, volume := range pod.Spec.Volumes { | ||
| if volume.PersistentVolumeClaim != nil && volume.PersistentVolumeClaim.ClaimName == pvc.Name { | ||
| return &pod, nil | ||
| } | ||
| } | ||
| } | ||
| return nil, nil | ||
| } | ||
|
|
||
| func (c *Controller) pvcForPod(o client.Object) (requests []reconcile.Request) { | ||
| if !c.isBindable(o.(*v1.Pod)) { | ||
| return requests | ||
| } | ||
| for _, volume := range o.(*v1.Pod).Spec.Volumes { | ||
| if volume.PersistentVolumeClaim == nil { | ||
| continue | ||
| } | ||
| requests = append(requests, reconcile.Request{NamespacedName: types.NamespacedName{Namespace: o.GetNamespace(), Name: volume.PersistentVolumeClaim.ClaimName}}) | ||
| } | ||
| return requests | ||
| } | ||
|
|
||
| func (c *Controller) isBindable(p *v1.Pod) bool { | ||
| return pod.IsScheduled(p) && !pod.IsTerminal(p) && !pod.IsTerminating(p) | ||
| } |