Fix an issue where getReadyIngresses was not loading ready ingresses …

…at startup (#1079)

* Update getReadyIngresses to load ingresses at startup

Indeed, we can't use label selector as kourier class is not a label, but an annotation. As a result, kourier does not sync ingresses at startup

* Explain KUBE_API_BURST and KUBE_API_QPS

config/300-controller.yaml

@@ -59,6 +59,13 @@ spec:
               value: "kourier-system"
             - name: ENABLE_SECRET_INFORMER_FILTERING_BY_CERT_UID
               value: "false"
+            # KUBE_API_BURST and KUBE_API_QPS allows to configure maximum burst for throttle and maximum QPS to the server from the client.
+            # Setting these values using env vars is possible since https://github.com/knative/pkg/pull/2755.
+            # 200 is an arbitrary value, but it speeds up kourier startup duration, and the whole ingress reconciliation process as a whole.
+            - name: KUBE_API_BURST
+              value: "200"
+            - name: KUBE_API_QPS
+              value: "200"
           ports:
           - name: http2-xds
             containerPort: 18000

pkg/reconciler/ingress/controller.go

@@ -25,7 +25,6 @@ import (
 	"go.uber.org/zap"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/sets"
 	v1 "k8s.io/client-go/informers/core/v1"
@@ -35,9 +34,10 @@ import (
 	"knative.dev/net-kourier/pkg/generator"
 	rconfig "knative.dev/net-kourier/pkg/reconciler/ingress/config"
 	"knative.dev/networking/pkg/apis/networking/v1alpha1"
+	networkingClientSet "knative.dev/networking/pkg/client/clientset/versioned/typed/networking/v1alpha1"
+	knativeclient "knative.dev/networking/pkg/client/injection/client"
 	ingressinformer "knative.dev/networking/pkg/client/injection/informers/networking/v1alpha1/ingress"
 	v1alpha1ingress "knative.dev/networking/pkg/client/injection/reconciler/networking/v1alpha1/ingress"
-	ingresslister "knative.dev/networking/pkg/client/listers/networking/v1alpha1"
 	netconfig "knative.dev/networking/pkg/config"
 	"knative.dev/networking/pkg/status"
 	kubeclient "knative.dev/pkg/client/injection/kube/client"
@@ -71,6 +71,7 @@ func NewController(ctx context.Context, cmw configmap.Watcher) *controller.Impl
 	logger := logging.FromContext(ctx)
 
 	kubernetesClient := kubeclient.Get(ctx)
+	knativeClient := knativeclient.Get(ctx)
 	ingressInformer := ingressinformer.Get(ctx)
 	endpointsInformer := endpointsinformer.Get(ctx)
 	serviceInformer := serviceinformer.Get(ctx)
@@ -203,7 +204,7 @@ func NewController(ctx context.Context, cmw configmap.Watcher) *controller.Impl
 	}
 
 	// Get the current list of ingresses that are ready and seed the Envoy config with them.
-	ingressesToSync, err := getReadyIngresses(ingressInformer.Lister())
+	ingressesToSync, err := getReadyIngresses(ctx, knativeClient.NetworkingV1alpha1())
 	if err != nil {
 		logger.Fatalw("Failed to fetch ready ingresses", zap.Error(err))
 	}
@@ -310,16 +311,16 @@ func NewController(ctx context.Context, cmw configmap.Watcher) *controller.Impl
 	return impl
 }
 
-func getReadyIngresses(ingressLister ingresslister.IngressLister) ([]*v1alpha1.Ingress, error) {
-	ingresses, err := ingressLister.List(labels.SelectorFromSet(map[string]string{
-		v1alpha1ingress.ClassAnnotationKey: config.KourierIngressClassName,
-	}))
+func getReadyIngresses(ctx context.Context, knativeClient networkingClientSet.NetworkingV1alpha1Interface) ([]*v1alpha1.Ingress, error) {
+	ingresses, err := knativeClient.Ingresses("").List(ctx, metav1.ListOptions{})
 	if err != nil {
 		return nil, err
 	}
-	ingressesToWarm := make([]*v1alpha1.Ingress, 0, len(ingresses))
-	for _, ingress := range ingresses {
-		if ingress.GetDeletionTimestamp() == nil && // Ignore ingresses that are already marked for deletion.
+	ingressesToWarm := make([]*v1alpha1.Ingress, 0, len(ingresses.Items))
+	for i := range ingresses.Items {
+		ingress := &ingresses.Items[i]
+		if isKourierIngress(ingress) &&
+			ingress.GetDeletionTimestamp() == nil && // Ignore ingresses that are already marked for deletion.
 			ingress.GetStatus().GetCondition(v1alpha1.IngressConditionNetworkConfigured).IsTrue() {
 			ingressesToWarm = append(ingressesToWarm, ingress)
 		}