Add CheckServiceExistence Rule for gke-ingress-checker

cmd/gke-diagnoser/app/ingress/rule.go

@@ -0,0 +1,39 @@
+/*
+Copyright 2023 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 ingress
+
+import (
+	"context"
+	"fmt"
+
+	corev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/ingress-gce/cmd/gke-diagnoser/app/report"
+)
+
+func CheckServiceExistence(namespace, name string, client clientset.Interface) (*corev1.Service, string, string) {
+	svc, err := client.CoreV1().Services(namespace).Get(context.TODO(), name, metav1.GetOptions{})
+	if err != nil {
+		if apierrors.IsNotFound(err) {
+			return nil, report.Failed, fmt.Sprintf("Service %s/%s does not exist", namespace, name)
+		}
+		return nil, report.Failed, fmt.Sprintf("Failed to get service %s/%s: %v", namespace, name, err)
+	}
+	return svc, report.Passed, fmt.Sprintf("Service %s/%s found", namespace, name)
+}

cmd/gke-diagnoser/app/ingress/rule_test.go

@@ -0,0 +1,73 @@
+/*
+Copyright 2023 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 ingress
+
+import (
+	"context"
+	"testing"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes/fake"
+	"k8s.io/ingress-gce/cmd/gke-diagnoser/app/report"
+)
+
+func TestCheckServiceExistence(t *testing.T) {
+	ns := "namespace1"
+	client := fake.NewSimpleClientset()
+	client.CoreV1().Services(ns).Create(context.TODO(), &corev1.Service{
+		ObjectMeta: metav1.ObjectMeta{
+			Namespace: ns,
+			Name:      "service-1",
+		},
+	}, metav1.CreateOptions{})
+
+	for _, tc := range []struct {
+		desc      string
+		namespace string
+		name      string
+		expect    string
+	}{
+		{
+			desc:   "empty input",
+			expect: report.Failed,
+		},
+		{
+			desc:      "correct namespace and correct name",
+			namespace: "namespace1",
+			name:      "service-1",
+			expect:    report.Passed,
+		},
+		{
+			desc:      "correct namespace and wrong name",
+			namespace: "namespace1",
+			name:      "service-2",
+			expect:    report.Failed,
+		},
+		{
+			desc:      "wrong namespace and correct name",
+			namespace: "namespace2",
+			name:      "service-1",
+			expect:    report.Failed,
+		},
+	} {
+		_, res, _ := CheckServiceExistence(tc.namespace, tc.name, client)
+		if res != tc.expect {
+			t.Errorf("For test case %q, expect check result = %s, but got %s", tc.desc, tc.expect, res)
+		}
+	}
+}

cmd/gke-diagnoser/app/util/report.go → cmd/gke-diagnoser/app/report/report.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package util
+package report
 
 import (
 	"encoding/json"