dynamic_test.go

package informers_test

import (
	"context"
	"testing"
	"time"

	appsv1 "k8s.io/api/apps/v1"
	extensionsv1beta1 "k8s.io/api/extensions/v1beta1"
	"k8s.io/apimachinery/pkg/api/equality"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/apimachinery/pkg/util/diff"
	"k8s.io/client-go/dynamic/fake"
	"k8s.io/client-go/tools/cache"

	xnsinformers "github.com/maistra/xns-informer/pkg/informers"
)

// This is directly adapted from the upstream tests for dynamic informers.

type triggerFunc func(gvr schema.GroupVersionResource, ns string, fakeClient *fake.FakeDynamicClient, testObject *unstructured.Unstructured) *unstructured.Unstructured

func triggerFactory(t *testing.T) triggerFunc {
	return func(gvr schema.GroupVersionResource, ns string, fakeClient *fake.FakeDynamicClient, _ *unstructured.Unstructured) *unstructured.Unstructured {
		testObject := newUnstructured("apps/v1", "Deployment", "ns-foo", "name-foo")
		createdObj, err := fakeClient.Resource(gvr).Namespace(ns).Create(context.TODO(), testObject, metav1.CreateOptions{})
		if err != nil {
			t.Error(err)
		}
		return createdObj
	}
}

func handler(rcvCh chan<- *unstructured.Unstructured) *cache.ResourceEventHandlerFuncs {
	return &cache.ResourceEventHandlerFuncs{
		AddFunc: func(obj interface{}) {
			rcvCh <- obj.(*unstructured.Unstructured)
		},
	}
}

func TestFilteredDynamicSharedInformerFactory(t *testing.T) {
	scenarios := []struct {
		name        string
		existingObj *unstructured.Unstructured
		gvr         schema.GroupVersionResource
		informNS    xnsinformers.NamespaceSet
		ns          string
		trigger     func(gvr schema.GroupVersionResource, ns string, fakeClient *fake.FakeDynamicClient, testObject *unstructured.Unstructured) *unstructured.Unstructured
		handler     func(rcvCh chan<- *unstructured.Unstructured) *cache.ResourceEventHandlerFuncs
	}{
		// scenario 1
		{
			name:     "scenario 1: test adding an object in different namespace should not trigger AddFunc",
			informNS: xnsinformers.NewNamespaceSet("ns-bar"),
			ns:       "ns-foo",
			gvr:      schema.GroupVersionResource{Group: "apps", Version: "v1", Resource: "deployments"},
			trigger:  triggerFactory(t),
			handler:  handler,
		},
		// scenario 2
		{
			name:     "scenario 2: test adding an object should trigger AddFunc",
			informNS: xnsinformers.NewNamespaceSet("ns-foo"),
			ns:       "ns-foo",
			gvr:      schema.GroupVersionResource{Group: "apps", Version: "v1", Resource: "deployments"},
			trigger:  triggerFactory(t),
			handler:  handler,
		},
	}

	for _, ts := range scenarios {
		t.Run(ts.name, func(t *testing.T) {
			// test data
			timeout := 3 * time.Second
			ctx, cancel := context.WithTimeout(context.Background(), timeout)
			defer cancel()
			scheme := runtime.NewScheme()
			err := appsv1.AddToScheme(scheme)
			if err != nil {
				t.Fatalf("couldn't add appsv1 to scheme: %v", err)
			}
			informerReceiveObjectCh := make(chan *unstructured.Unstructured, 1)
			objs := []runtime.Object{}
			if ts.existingObj != nil {
				objs = append(objs, ts.existingObj)
			}
			fakeClient := fake.NewSimpleDynamicClient(scheme, objs...)
			target := xnsinformers.NewFilteredDynamicSharedInformerFactory(fakeClient, 0, ts.informNS, nil)

			// act
			informerListerForGvr := target.ForResource(ts.gvr)
			informerListerForGvr.Informer().AddEventHandler(ts.handler(informerReceiveObjectCh))
			target.Start(ctx.Done())
			if synced := target.WaitForCacheSync(ctx.Done()); !synced[ts.gvr] {
				t.Errorf("informer for %s hasn't synced", ts.gvr)
			}

			testObject := ts.trigger(ts.gvr, ts.ns, fakeClient, ts.existingObj)
			select {
			case objFromInformer := <-informerReceiveObjectCh:
				if !ts.informNS.Contains(ts.ns) {
					t.Errorf("informer received an object for namespace %s when watching namespaces %s", ts.ns, ts.informNS.List())
				}
				if !equality.Semantic.DeepEqual(testObject, objFromInformer) {
					t.Fatalf("%v", diff.ObjectDiff(testObject, objFromInformer))
				}
			case <-ctx.Done():
				if ts.informNS.Contains(ts.ns) {
					t.Errorf("tested informer haven't received an object, waited %v", timeout)
				}
			}
		})
	}

}

func TestDynamicSharedInformerFactory(t *testing.T) {
	scenarios := []struct {
		name        string
		existingObj *unstructured.Unstructured
		gvr         schema.GroupVersionResource
		ns          string
		trigger     func(gvr schema.GroupVersionResource, ns string, fakeClient *fake.FakeDynamicClient, testObject *unstructured.Unstructured) *unstructured.Unstructured
		handler     func(rcvCh chan<- *unstructured.Unstructured) *cache.ResourceEventHandlerFuncs
	}{
		// scenario 1
		{
			name: "scenario 1: test if adding an object triggers AddFunc",
			ns:   "ns-foo",
			gvr:  schema.GroupVersionResource{Group: "extensions", Version: "v1beta1", Resource: "deployments"},
			trigger: func(gvr schema.GroupVersionResource, ns string, fakeClient *fake.FakeDynamicClient, _ *unstructured.Unstructured) *unstructured.Unstructured {
				testObject := newUnstructured("extensions/v1beta1", "Deployment", "ns-foo", "name-foo")
				createdObj, err := fakeClient.Resource(gvr).Namespace(ns).Create(context.TODO(), testObject, metav1.CreateOptions{})
				if err != nil {
					t.Error(err)
				}
				return createdObj
			},
			handler: func(rcvCh chan<- *unstructured.Unstructured) *cache.ResourceEventHandlerFuncs {
				return &cache.ResourceEventHandlerFuncs{
					AddFunc: func(obj interface{}) {
						rcvCh <- obj.(*unstructured.Unstructured)
					},
				}
			},
		},

		// scenario 2
		{
			name:        "scenario 2: tests if updating an object triggers UpdateFunc",
			ns:          "ns-foo",
			gvr:         schema.GroupVersionResource{Group: "extensions", Version: "v1beta1", Resource: "deployments"},
			existingObj: newUnstructured("extensions/v1beta1", "Deployment", "ns-foo", "name-foo"),
			trigger: func(gvr schema.GroupVersionResource, ns string, fakeClient *fake.FakeDynamicClient, testObject *unstructured.Unstructured) *unstructured.Unstructured {
				testObject.Object["spec"] = "updatedName"
				updatedObj, err := fakeClient.Resource(gvr).Namespace(ns).Update(context.TODO(), testObject, metav1.UpdateOptions{})
				if err != nil {
					t.Error(err)
				}
				return updatedObj
			},
			handler: func(rcvCh chan<- *unstructured.Unstructured) *cache.ResourceEventHandlerFuncs {
				return &cache.ResourceEventHandlerFuncs{
					UpdateFunc: func(old, updated interface{}) {
						rcvCh <- updated.(*unstructured.Unstructured)
					},
				}
			},
		},

		// scenario 3
		{
			name:        "scenario 3: test if deleting an object triggers DeleteFunc",
			ns:          "ns-foo",
			gvr:         schema.GroupVersionResource{Group: "extensions", Version: "v1beta1", Resource: "deployments"},
			existingObj: newUnstructured("extensions/v1beta1", "Deployment", "ns-foo", "name-foo"),
			trigger: func(gvr schema.GroupVersionResource, ns string, fakeClient *fake.FakeDynamicClient, testObject *unstructured.Unstructured) *unstructured.Unstructured {
				err := fakeClient.Resource(gvr).Namespace(ns).Delete(context.TODO(), testObject.GetName(), metav1.DeleteOptions{})
				if err != nil {
					t.Error(err)
				}
				return testObject
			},
			handler: func(rcvCh chan<- *unstructured.Unstructured) *cache.ResourceEventHandlerFuncs {
				return &cache.ResourceEventHandlerFuncs{
					DeleteFunc: func(obj interface{}) {
						rcvCh <- obj.(*unstructured.Unstructured)
					},
				}
			},
		},
	}

	for _, ts := range scenarios {
		t.Run(ts.name, func(t *testing.T) {
			// test data
			timeout := 3 * time.Second
			ctx, cancel := context.WithTimeout(context.Background(), timeout)
			defer cancel()
			scheme := runtime.NewScheme()
			informerReceiveObjectCh := make(chan *unstructured.Unstructured, 1)
			objs := []runtime.Object{}
			if ts.existingObj != nil {
				objs = append(objs, ts.existingObj)
			}
			gvrToListKind := map[schema.GroupVersionResource]string{
				extensionsv1beta1.SchemeGroupVersion.WithResource("deployments"): "DeploymentList",
			}
			fakeClient := fake.NewSimpleDynamicClientWithCustomListKinds(scheme, gvrToListKind, objs...)
			target := xnsinformers.NewDynamicSharedInformerFactory(fakeClient, 0)

			// act
			informerListerForGvr := target.ForResource(ts.gvr)
			informerListerForGvr.Informer().AddEventHandler(ts.handler(informerReceiveObjectCh))
			target.Start(ctx.Done())
			if synced := target.WaitForCacheSync(ctx.Done()); !synced[ts.gvr] {
				t.Errorf("informer for %s hasn't synced", ts.gvr)
			}

			testObject := ts.trigger(ts.gvr, ts.ns, fakeClient, ts.existingObj)
			select {
			case objFromInformer := <-informerReceiveObjectCh:
				if !equality.Semantic.DeepEqual(testObject, objFromInformer) {
					t.Fatalf("%v", diff.ObjectDiff(testObject, objFromInformer))
				}
			case <-ctx.Done():
				t.Errorf("tested informer haven't received an object, waited %v", timeout)
			}
		})
	}
}

func newUnstructured(apiVersion, kind, namespace, name string) *unstructured.Unstructured {
	return &unstructured.Unstructured{
		Object: map[string]interface{}{
			"apiVersion": apiVersion,
			"kind":       kind,
			"metadata": map[string]interface{}{
				"namespace": namespace,
				"name":      name,
			},
			"spec": name,
		},
	}
}