DRA: Update controller for Prioritized Alternatives in Device Requests

cmd/kube-controller-manager/app/core.go

@@ -408,7 +408,10 @@ func newResourceClaimControllerDescriptor() *ControllerDescriptor {
 func startResourceClaimController(ctx context.Context, controllerContext ControllerContext, controllerName string) (controller.Interface, bool, error) {
 	ephemeralController, err := resourceclaim.NewController(
 		klog.FromContext(ctx),
-		utilfeature.DefaultFeatureGate.Enabled(features.DRAAdminAccess),
+		resourceclaim.Features{
+			AdminAccess:     utilfeature.DefaultFeatureGate.Enabled(features.DRAAdminAccess),
+			PrioritizedList: utilfeature.DefaultFeatureGate.Enabled(features.DRAPrioritizedList),
+		},
 		controllerContext.ClientBuilder.ClientOrDie("resource-claim-controller"),
 		controllerContext.InformerFactory.Core().V1().Pods(),
 		controllerContext.InformerFactory.Resource().V1beta1().ResourceClaims(),

pkg/controller/resourceclaim/controller.go

@@ -71,8 +71,8 @@ const (
 
 // Controller creates ResourceClaims for ResourceClaimTemplates in a pod spec.
 type Controller struct {
-	// adminAccessEnabled matches the DRAAdminAccess feature gate state.
+	// features defines the feature gates that are enabled.
-	adminAccessEnabled bool
+	features Features
 
 	// kubeClient is the kube API client used to communicate with the API
 	// server.
@@ -118,17 +118,23 @@ const (
 	podKeyPrefix   = "pod:"
 )
 
+// Features defines which features should be enabled in the controller.
+type Features struct {
+	AdminAccess     bool
+	PrioritizedList bool
+}
+
 // NewController creates a ResourceClaim controller.
 func NewController(
 	logger klog.Logger,
-	adminAccessEnabled bool,
+	features Features,
 	kubeClient clientset.Interface,
 	podInformer v1informers.PodInformer,
 	claimInformer resourceinformers.ResourceClaimInformer,
 	templateInformer resourceinformers.ResourceClaimTemplateInformer) (*Controller, error) {
 
 	ec := &Controller{
-		adminAccessEnabled: adminAccessEnabled,
+		features:        features,
 		kubeClient:      kubeClient,
 		podLister:       podInformer.Lister(),
 		podIndexer:      podInformer.Informer().GetIndexer(),
@@ -617,10 +623,14 @@ func (ec *Controller) handleClaim(ctx context.Context, pod *v1.Pod, podClaim v1.
 			return fmt.Errorf("resource claim template %q: %v", *templateName, err)
 		}
 
-		if !ec.adminAccessEnabled && needsAdminAccess(template) {
+		if !ec.features.AdminAccess && needsAdminAccess(template) {
 			return errors.New("admin access is requested, but the feature is disabled")
 		}
 
+		if !ec.features.PrioritizedList && hasPrioritizedList(template) {
+			return errors.New("template includes a prioritized list of subrequests, but the feature is disabled")
+		}
+
 		// Create the ResourceClaim with pod as owner, with a generated name that uses
 		// <pod>-<claim name> as base.
 		isTrue := true
@@ -688,6 +698,15 @@ func needsAdminAccess(claimTemplate *resourceapi.ResourceClaimTemplate) bool {
 	return false
 }
 
+func hasPrioritizedList(claimTemplate *resourceapi.ResourceClaimTemplate) bool {
+	for _, request := range claimTemplate.Spec.Spec.Devices.Requests {
+		if len(request.FirstAvailable) > 0 {
+			return true
+		}
+	}
+	return false
+}
+
 // findPodResourceClaim looks for an existing ResourceClaim with the right
 // annotation (ties it to the pod claim) and the right ownership (ties it to
 // the pod).

pkg/controller/resourceclaim/controller_test.go

@@ -85,6 +85,7 @@ func TestSyncHandler(t *testing.T) {
 		name                   string
 		key                    string
 		adminAccessEnabled     bool
+		prioritizedListEnabled bool
 		claims                 []*resourceapi.ResourceClaim
 		claimsInCache          []*resourceapi.ResourceClaim
 		pods                   []*v1.Pod
@@ -390,7 +391,11 @@ func TestSyncHandler(t *testing.T) {
 			claimInformer := informerFactory.Resource().V1beta1().ResourceClaims()
 			templateInformer := informerFactory.Resource().V1beta1().ResourceClaimTemplates()
 
-			ec, err := NewController(tCtx.Logger(), tc.adminAccessEnabled, fakeKubeClient, podInformer, claimInformer, templateInformer)
+			features := Features{
+				AdminAccess:     tc.adminAccessEnabled,
+				PrioritizedList: tc.prioritizedListEnabled,
+			}
+			ec, err := NewController(tCtx.Logger(), features, fakeKubeClient, podInformer, claimInformer, templateInformer)
 			if err != nil {
 				t.Fatalf("error creating ephemeral controller : %v", err)
 			}
@@ -465,7 +470,7 @@ func TestResourceClaimEventHandler(t *testing.T) {
 	templateInformer := informerFactory.Resource().V1beta1().ResourceClaimTemplates()
 	claimClient := fakeKubeClient.ResourceV1beta1().ResourceClaims(testNamespace)
 
-	_, err := NewController(tCtx.Logger(), false /* admin access */, fakeKubeClient, podInformer, claimInformer, templateInformer)
+	_, err := NewController(tCtx.Logger(), Features{}, fakeKubeClient, podInformer, claimInformer, templateInformer)
 	tCtx.ExpectNoError(err, "creating ephemeral controller")
 
 	informerFactory.Start(tCtx.Done())

test/integration/util/util.go

@@ -132,7 +132,11 @@ func CreateResourceClaimController(ctx context.Context, tb ktesting.TB, clientSe
 	podInformer := informerFactory.Core().V1().Pods()
 	claimInformer := informerFactory.Resource().V1beta1().ResourceClaims()
 	claimTemplateInformer := informerFactory.Resource().V1beta1().ResourceClaimTemplates()
-	claimController, err := resourceclaim.NewController(klog.FromContext(ctx), true /* admin access */, clientSet, podInformer, claimInformer, claimTemplateInformer)
+	features := resourceclaim.Features{
+		AdminAccess:     true,
+		PrioritizedList: true,
+	}
+	claimController, err := resourceclaim.NewController(klog.FromContext(ctx), features, clientSet, podInformer, claimInformer, claimTemplateInformer)
 	if err != nil {
 		tb.Fatalf("Error creating claim controller: %v", err)
 	}