Add WithLabel list filter to serving client lib (#1054)

* add WithLabel list filter

Signed-off-by: Zbynek Roubalik <zroubali@redhat.com>

* adding tests

Signed-off-by: Zbynek Roubalik <zroubali@redhat.com>

* update changelog

Signed-off-by: Zbynek Roubalik <zroubali@redhat.com>

CHANGELOG.adoc

@@ -19,6 +19,10 @@
 | 🎁
 | Add Aliases to Help Command and Remove Aliases in Short
 | https://github.com/knative/client/pull/1055[#1055]
+
+| 🎁
+| Add WithLabel list filter to serving client lib
+| https://github.com/knative/client/pull/1054[#1054]
 |===
 
 ## v0.18.0 (2020-10-07)

pkg/serving/v1/client.go

@@ -141,6 +141,13 @@ func WithService(service string) ListConfig {
 	}
 }
 
+// WithLabel filters on the provided label
+func WithLabel(labelKey, labelValue string) ListConfig {
+	return func(lo *listConfigCollector) {
+		lo.Labels[labelKey] = labelValue
+	}
+}
+
 type knServingClient struct {
 	client    clientv1.ServingV1Interface
 	namespace string

pkg/serving/v1/client_mock_test.go

@@ -34,6 +34,7 @@ func TestMockKnClient(t *testing.T) {
 	// Record all services
 	recorder.GetService("hello", nil, nil)
 	recorder.ListServices(mock.Any(), nil, nil)
+	recorder.ListServices(mock.Any(), nil, nil)
 	recorder.CreateService(&servingv1.Service{}, nil)
 	recorder.UpdateService(&servingv1.Service{}, nil)
 	recorder.DeleteService("hello", time.Duration(10)*time.Second, nil)
@@ -48,6 +49,7 @@ func TestMockKnClient(t *testing.T) {
 	// Call all services
 	client.GetService("hello")
 	client.ListServices(WithName("blub"))
+	client.ListServices(WithLabel("foo", "bar"))
 	client.CreateService(&servingv1.Service{})
 	client.UpdateService(&servingv1.Service{})
 	client.DeleteService("hello", time.Duration(10)*time.Second)

pkg/serving/v1/client_test.go

@@ -85,24 +85,45 @@ func TestListService(t *testing.T) {
 	serving, client := setup()
 
 	t.Run("list service returns a list of services", func(t *testing.T) {
+		labelKey := "labelKey"
+		labelValue := "labelValue"
+		labels := map[string]string{labelKey: labelValue}
+		incorrectLabels := map[string]string{"foo": "bar"}
+
 		service1 := newService("service-1")
 		service2 := newService("service-2")
+		service3 := newService("service-3-with-label")
+		service3.Labels = labels
+		service4 := newService("service-4-with-label")
+		service4.Labels = labels
+		service5 := newService("service-5-with-incorrect-label")
+		service5.Labels = incorrectLabels
 
 		serving.AddReactor("list", "services",
 			func(a clienttesting.Action) (bool, runtime.Object, error) {
 				assert.Equal(t, testNamespace, a.GetNamespace())
-				return true, &servingv1.ServiceList{Items: []servingv1.Service{*service1, *service2}}, nil
+				return true, &servingv1.ServiceList{Items: []servingv1.Service{*service1, *service2, *service3, *service4, *service5}}, nil
 			})
 
 		listServices, err := client.ListServices()
 		assert.NilError(t, err)
-		assert.Assert(t, len(listServices.Items) == 2)
+		assert.Assert(t, len(listServices.Items) == 5)
 		assert.Equal(t, listServices.Items[0].Name, "service-1")
 		assert.Equal(t, listServices.Items[1].Name, "service-2")
 		validateGroupVersionKind(t, listServices)
 		validateGroupVersionKind(t, &listServices.Items[0])
 		validateGroupVersionKind(t, &listServices.Items[1])
+
+		listFilteredServices, err := client.ListServices(WithLabel(labelKey, labelValue))
+		assert.NilError(t, err)
+		assert.Assert(t, len(listFilteredServices.Items) == 2)
+		assert.Equal(t, listFilteredServices.Items[0].Name, "service-3-with-label")
+		assert.Equal(t, listFilteredServices.Items[1].Name, "service-4-with-label")
+		validateGroupVersionKind(t, listFilteredServices)
+		validateGroupVersionKind(t, &listFilteredServices.Items[0])
+		validateGroupVersionKind(t, &listFilteredServices.Items[1])
 	})
+
 }
 
 func TestCreateService(t *testing.T) {