ingress: Update IngressClass feature and admission controller for v1

Signed-off-by: Christopher M. Luciano <[email protected]>

Author: Christopher M. Luciano

pkg/features/kube_features.go

@@ -568,6 +568,7 @@ const (
 
 	// owner: @robscott
 	// beta: v1.18
+	// ga: v1.19
 	//
 	// Enables DefaultIngressClass admission controller.
 	DefaultIngressClass featuregate.Feature = "DefaultIngressClass"
@@ -678,7 +679,7 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
 	ServiceTopology:                                {Default: false, PreRelease: featuregate.Alpha},
 	ServiceAppProtocol:                             {Default: true, PreRelease: featuregate.Beta},
 	ImmutableEphemeralVolumes:                      {Default: true, PreRelease: featuregate.Beta},
-	DefaultIngressClass:                            {Default: true, PreRelease: featuregate.Beta},
+	DefaultIngressClass:                            {Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.20
 	HugePageStorageMediumSize:                      {Default: false, PreRelease: featuregate.Alpha},
 	ExternalPolicyForExternalIP:                    {Default: true, PreRelease: featuregate.GA}, // remove in 1.20
 	AnyVolumeDataSource:                            {Default: false, PreRelease: featuregate.Alpha},

plugin/pkg/admission/defaultingressclass/BUILD

@@ -7,15 +7,14 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//pkg/apis/networking:go_default_library",
-        "//pkg/features:go_default_library",
+        "//staging/src/k8s.io/api/networking/v1:go_default_library",
         "//staging/src/k8s.io/api/networking/v1beta1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/api/errors:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/labels:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/admission:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/admission/initializer:go_default_library",
         "//staging/src/k8s.io/client-go/informers:go_default_library",
-        "//staging/src/k8s.io/client-go/listers/networking/v1beta1:go_default_library",
-        "//staging/src/k8s.io/component-base/featuregate:go_default_library",
+        "//staging/src/k8s.io/client-go/listers/networking/v1:go_default_library",
         "//vendor/k8s.io/klog/v2:go_default_library",
     ],
 )
@@ -28,6 +27,7 @@ go_test(
         "//pkg/apis/core:go_default_library",
         "//pkg/apis/networking:go_default_library",
         "//pkg/controller:go_default_library",
+        "//staging/src/k8s.io/api/networking/v1:go_default_library",
         "//staging/src/k8s.io/api/networking/v1beta1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/api/errors:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",

plugin/pkg/admission/defaultingressclass/admission.go

@@ -21,17 +21,16 @@ import (
 	"fmt"
 	"io"
 
+	networkingv1 "k8s.io/api/networking/v1"
 	networkingv1beta1 "k8s.io/api/networking/v1beta1"
 	"k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apiserver/pkg/admission"
 	genericadmissioninitializer "k8s.io/apiserver/pkg/admission/initializer"
 	"k8s.io/client-go/informers"
-	networkingv1beta1listers "k8s.io/client-go/listers/networking/v1beta1"
-	"k8s.io/component-base/featuregate"
+	networkingv1listers "k8s.io/client-go/listers/networking/v1"
 	"k8s.io/klog/v2"
 	"k8s.io/kubernetes/pkg/apis/networking"
-	"k8s.io/kubernetes/pkg/features"
 )
 
 const (
@@ -50,10 +49,7 @@ func Register(plugins *admission.Plugins) {
 // classDefaulterPlugin holds state for and implements the admission plugin.
 type classDefaulterPlugin struct {
 	*admission.Handler
-	lister networkingv1beta1listers.IngressClassLister
-
-	inspectedFeatures          bool
-	defaultIngressClassEnabled bool
+	lister networkingv1listers.IngressClassLister
 }
 
 var _ admission.Interface = &classDefaulterPlugin{}
@@ -67,31 +63,16 @@ func newPlugin() *classDefaulterPlugin {
 	}
 }
 
-// InspectFeatureGates allows setting bools without taking a dep on a global variable
-func (a *classDefaulterPlugin) InspectFeatureGates(featureGates featuregate.FeatureGate) {
-	a.defaultIngressClassEnabled = featureGates.Enabled(features.DefaultIngressClass)
-	a.inspectedFeatures = true
-}
-
 // SetExternalKubeInformerFactory sets a lister and readyFunc for this
 // classDefaulterPlugin using the provided SharedInformerFactory.
 func (a *classDefaulterPlugin) SetExternalKubeInformerFactory(f informers.SharedInformerFactory) {
-	if !a.defaultIngressClassEnabled {
-		return
-	}
-	informer := f.Networking().V1beta1().IngressClasses()
+	informer := f.Networking().V1().IngressClasses()
 	a.lister = informer.Lister()
 	a.SetReadyFunc(informer.Informer().HasSynced)
 }
 
 // ValidateInitialization ensures lister is set.
 func (a *classDefaulterPlugin) ValidateInitialization() error {
-	if !a.inspectedFeatures {
-		return fmt.Errorf("InspectFeatureGates was not called")
-	}
-	if !a.defaultIngressClassEnabled {
-		return nil
-	}
 	if a.lister == nil {
 		return fmt.Errorf("missing lister")
 	}
@@ -101,10 +82,7 @@ func (a *classDefaulterPlugin) ValidateInitialization() error {
 // Admit sets the default value of a Ingress's class if the user did not specify
 // a class.
 func (a *classDefaulterPlugin) Admit(ctx context.Context, attr admission.Attributes, o admission.ObjectInterfaces) error {
-	if !a.defaultIngressClassEnabled {
-		return nil
-	}
-	if attr.GetResource().GroupResource() != networkingv1beta1.Resource("ingresses") {
+	if attr.GetResource().GroupResource() != networkingv1.Resource("ingresses") {
 		return nil
 	}
 
@@ -147,13 +125,13 @@ func (a *classDefaulterPlugin) Admit(ctx context.Context, attr admission.Attribu
 }
 
 // getDefaultClass returns the default IngressClass from the store, or nil.
-func getDefaultClass(lister networkingv1beta1listers.IngressClassLister) (*networkingv1beta1.IngressClass, error) {
+func getDefaultClass(lister networkingv1listers.IngressClassLister) (*networkingv1.IngressClass, error) {
 	list, err := lister.List(labels.Everything())
 	if err != nil {
 		return nil, err
 	}
 
-	defaultClasses := []*networkingv1beta1.IngressClass{}
+	defaultClasses := []*networkingv1.IngressClass{}
 	for _, class := range list {
 		if class.Annotations[networkingv1beta1.AnnotationIsDefaultIngressClass] == "true" {
 			defaultClasses = append(defaultClasses, class)

plugin/pkg/admission/defaultingressclass/admission_test.go

@@ -22,6 +22,7 @@ import (
 	"reflect"
 	"testing"
 
+	networkingv1 "k8s.io/api/networking/v1"
 	networkingv1beta1 "k8s.io/api/networking/v1beta1"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -35,7 +36,7 @@ import (
 )
 
 func TestAdmission(t *testing.T) {
-	defaultClass1 := &networkingv1beta1.IngressClass{
+	defaultClass1 := &networkingv1.IngressClass{
 		TypeMeta: metav1.TypeMeta{
 			Kind: "IngressClass",
 		},
@@ -46,7 +47,7 @@ func TestAdmission(t *testing.T) {
 			},
 		},
 	}
-	defaultClass2 := &networkingv1beta1.IngressClass{
+	defaultClass2 := &networkingv1.IngressClass{
 		ObjectMeta: metav1.ObjectMeta{
 			Name: "default2",
 			Annotations: map[string]string{
@@ -55,7 +56,7 @@ func TestAdmission(t *testing.T) {
 		},
 	}
 	// Class that has explicit default = false
-	classWithFalseDefault := &networkingv1beta1.IngressClass{
+	classWithFalseDefault := &networkingv1.IngressClass{
 		TypeMeta: metav1.TypeMeta{
 			Kind: "IngressClass",
 		},
@@ -67,7 +68,7 @@ func TestAdmission(t *testing.T) {
 		},
 	}
 	// Class with missing default annotation (=non-default)
-	classWithNoDefault := &networkingv1beta1.IngressClass{
+	classWithNoDefault := &networkingv1.IngressClass{
 		TypeMeta: metav1.TypeMeta{
 			Kind: "IngressClass",
 		},
@@ -76,7 +77,7 @@ func TestAdmission(t *testing.T) {
 		},
 	}
 	// Class with empty default annotation (=non-default)
-	classWithEmptyDefault := &networkingv1beta1.IngressClass{
+	classWithEmptyDefault := &networkingv1.IngressClass{
 		TypeMeta: metav1.TypeMeta{
 			Kind: "IngressClass",
 		},
@@ -90,63 +91,63 @@ func TestAdmission(t *testing.T) {
 
 	testCases := []struct {
 		name            string
-		classes         []*networkingv1beta1.IngressClass
+		classes         []*networkingv1.IngressClass
 		classField      *string
 		classAnnotation *string
 		expectedClass   *string
 		expectedError   error
 	}{
 		{
 			name:            "no default, no modification of Ingress",
-			classes:         []*networkingv1beta1.IngressClass{classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
+			classes:         []*networkingv1.IngressClass{classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
 			classField:      nil,
 			classAnnotation: nil,
 			expectedClass:   nil,
 			expectedError:   nil,
 		},
 		{
 			name:            "one default, modify Ingress with class=nil",
-			classes:         []*networkingv1beta1.IngressClass{defaultClass1, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
+			classes:         []*networkingv1.IngressClass{defaultClass1, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
 			classField:      nil,
 			classAnnotation: nil,
 			expectedClass:   utilpointer.StringPtr(defaultClass1.Name),
 			expectedError:   nil,
 		},
 		{
 			name:            "one default, no modification of Ingress with class field=''",
-			classes:         []*networkingv1beta1.IngressClass{defaultClass1, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
+			classes:         []*networkingv1.IngressClass{defaultClass1, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
 			classField:      utilpointer.StringPtr(""),
 			classAnnotation: nil,
 			expectedClass:   utilpointer.StringPtr(""),
 			expectedError:   nil,
 		},
 		{
 			name:            "one default, no modification of Ingress with class field='foo'",
-			classes:         []*networkingv1beta1.IngressClass{defaultClass1, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
+			classes:         []*networkingv1.IngressClass{defaultClass1, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
 			classField:      utilpointer.StringPtr("foo"),
 			classAnnotation: nil,
 			expectedClass:   utilpointer.StringPtr("foo"),
 			expectedError:   nil,
 		},
 		{
 			name:            "one default, no modification of Ingress with class annotation='foo'",
-			classes:         []*networkingv1beta1.IngressClass{defaultClass1, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
+			classes:         []*networkingv1.IngressClass{defaultClass1, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
 			classField:      nil,
 			classAnnotation: utilpointer.StringPtr("foo"),
 			expectedClass:   nil,
 			expectedError:   nil,
 		},
 		{
 			name:            "two defaults, error with Ingress with class field=nil",
-			classes:         []*networkingv1beta1.IngressClass{defaultClass1, defaultClass2, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
+			classes:         []*networkingv1.IngressClass{defaultClass1, defaultClass2, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
 			classField:      nil,
 			classAnnotation: nil,
 			expectedClass:   nil,
-			expectedError:   errors.NewForbidden(networkingv1beta1.Resource("ingresses"), "testing", errors.NewInternalError(fmt.Errorf("2 default IngressClasses were found, only 1 allowed"))),
+			expectedError:   errors.NewForbidden(networkingv1.Resource("ingresses"), "testing", errors.NewInternalError(fmt.Errorf("2 default IngressClasses were found, only 1 allowed"))),
 		},
 		{
 			name:            "two defaults, no modification with Ingress with class field=''",
-			classes:         []*networkingv1beta1.IngressClass{defaultClass1, defaultClass2, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
+			classes:         []*networkingv1.IngressClass{defaultClass1, defaultClass2, classWithFalseDefault, classWithNoDefault, classWithEmptyDefault},
 			classField:      utilpointer.StringPtr(""),
 			classAnnotation: nil,
 			expectedClass:   utilpointer.StringPtr(""),
@@ -157,11 +158,10 @@ func TestAdmission(t *testing.T) {
 	for _, testCase := range testCases {
 		t.Run(testCase.name, func(t *testing.T) {
 			ctrl := newPlugin()
-			ctrl.defaultIngressClassEnabled = true
 			informerFactory := informers.NewSharedInformerFactory(nil, controller.NoResyncPeriodFunc())
 			ctrl.SetExternalKubeInformerFactory(informerFactory)
 			for _, c := range testCase.classes {
-				informerFactory.Networking().V1beta1().IngressClasses().Informer().GetStore().Add(c)
+				informerFactory.Networking().V1().IngressClasses().Informer().GetStore().Add(c)
 			}
 
 			ingress := &networking.Ingress{ObjectMeta: metav1.ObjectMeta{Name: "testing", Namespace: "testing"}}
@@ -178,7 +178,7 @@ func TestAdmission(t *testing.T) {
 				api.Kind("Ingress").WithVersion("version"),
 				ingress.Namespace,
 				ingress.Name,
-				networkingv1beta1.Resource("ingresses").WithVersion("version"),
+				networkingv1.Resource("ingresses").WithVersion("version"),
 				"", // subresource
 				admission.Create,
 				&metav1.CreateOptions{},