feat: switch from endpoints to endpointslices (#8890)

* endpointslices

Signed-off-by: tombokombo <tombo@sysart.tech>

* cleanup

Signed-off-by: tombokombo <tombo@sysart.tech>

* fix rbac

Signed-off-by: tombokombo <tombo@sysart.tech>

* fix comments

Signed-off-by: tombokombo <tombo@sysart.tech>

* cleanup store, add store tests

Signed-off-by: tombokombo <tombo@sysart.tech>

* fix copyright date

Signed-off-by: tombokombo <tombo@sysart.tech>

Signed-off-by: tombokombo <tombo@sysart.tech>

internal/ingress/controller/store/endpointslice_test.go

@@ -0,0 +1,94 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+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 store
+
+import (
+	"testing"
+
+	discoveryv1 "k8s.io/api/discovery/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/tools/cache"
+)
+
+func newEndpointSliceLister(t *testing.T) *EndpointSliceLister {
+	t.Helper()
+
+	return &EndpointSliceLister{Store: cache.NewStore(cache.MetaNamespaceKeyFunc)}
+}
+
+func TestEndpointSliceLister(t *testing.T) {
+	t.Run("the key does not exist", func(t *testing.T) {
+		el := newEndpointSliceLister(t)
+
+		key := "namespace/svcname"
+		_, err := el.MatchByKey(key)
+
+		if err == nil {
+			t.Error("expected an error but nothing has been returned")
+		}
+
+		if _, ok := err.(NotExistsError); !ok {
+			t.Errorf("expected NotExistsError, got %v", err)
+		}
+	})
+	t.Run("the key exists", func(t *testing.T) {
+		el := newEndpointSliceLister(t)
+
+		key := "namespace/svcname"
+		endpointSlice := &discoveryv1.EndpointSlice{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace: "namespace",
+				Name:      "anothername-foo",
+				Labels: map[string]string{
+					discoveryv1.LabelServiceName: "svcname",
+				},
+			},
+		}
+		el.Add(endpointSlice)
+		endpointSlice = &discoveryv1.EndpointSlice{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace: "namespace",
+				Name:      "svcname-bar",
+				Labels: map[string]string{
+					discoveryv1.LabelServiceName: "othersvc",
+				},
+			},
+		}
+		el.Add(endpointSlice)
+		endpointSlice = &discoveryv1.EndpointSlice{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace: "namespace",
+				Name:      "svcname-buz",
+				Labels: map[string]string{
+					discoveryv1.LabelServiceName: "svcname",
+				},
+			},
+		}
+		el.Add(endpointSlice)
+		eps, err := el.MatchByKey(key)
+
+		if err != nil {
+			t.Errorf("unexpeted error %v", err)
+		}
+		if err == nil && len(eps) != 1 {
+			t.Errorf("expected one slice %v, error, got %d slices", endpointSlice, len(eps))
+		}
+		if len(eps) > 0 && eps[0].GetName() != endpointSlice.GetName() {
+			t.Errorf("expected %v, error, got %v", endpointSlice.GetName(), eps[0].GetName())
+		}
+	})
+}