add GVK to fake dynamic client to match actual behavior

Kubernetes-commit: f4383458432cd67714e9ce0acde56a2ed5c24a21

dynamic/dynamicinformer/informer_test.go

@@ -95,7 +95,12 @@ func TestFilteredDynamicSharedInformerFactory(t *testing.T) {
 			if ts.existingObj != nil {
 				objs = append(objs, ts.existingObj)
 			}
-			fakeClient := fake.NewSimpleDynamicClient(scheme, objs...)
+			// don't adjust the scheme to include deploymentlist. This is testing whether an informer can be created against using
+			// a client that doesn't have a type registered in the scheme.
+			gvrToListKind := map[schema.GroupVersionResource]string{
+				{Group: "apps", Version: "v1", Resource: "deployments"}: "DeploymentList",
+			}
+			fakeClient := fake.NewSimpleDynamicClientWithCustomListKinds(scheme, gvrToListKind, objs...)
 			target := dynamicinformer.NewFilteredDynamicSharedInformerFactory(fakeClient, 0, ts.informNS, nil)
 
 			// act
@@ -214,7 +219,12 @@ func TestDynamicSharedInformerFactory(t *testing.T) {
 			if ts.existingObj != nil {
 				objs = append(objs, ts.existingObj)
 			}
-			fakeClient := fake.NewSimpleDynamicClient(scheme, objs...)
+			// don't adjust the scheme to include deploymentlist. This is testing whether an informer can be created against using
+			// a client that doesn't have a type registered in the scheme.
+			gvrToListKind := map[schema.GroupVersionResource]string{
+				{Group: "extensions", Version: "v1beta1", Resource: "deployments"}: "DeploymentList",
+			}
+			fakeClient := fake.NewSimpleDynamicClientWithCustomListKinds(scheme, gvrToListKind, objs...)
 			target := dynamicinformer.NewDynamicSharedInformerFactory(fakeClient, 0)
 
 			// act

dynamic/fake/simple.go

@@ -18,6 +18,7 @@ package fake
 
 import (
 	"context"
+	"fmt"
 	"strings"
 
 	"k8s.io/apimachinery/pkg/api/meta"
@@ -34,11 +35,45 @@ import (
 )
 
 func NewSimpleDynamicClient(scheme *runtime.Scheme, objects ...runtime.Object) *FakeDynamicClient {
-	// In order to use List with this client, you have to have the v1.List registered in your scheme. Neat thing though
+	return NewSimpleDynamicClientWithCustomListKinds(scheme, nil, objects...)
-	// it does NOT have to be the *same* list. UnstructuredList returned from this fake client will NOT have apiVersion and kind set,
+}
-	// but each Unstructured object in Items will preserve their respective apiVersion and kind. As a result, schema conversion for
+
-	// *List kinds will not work and conversion of each Unstructured object in Items will be required instead.
+// NewSimpleDynamicClientWithCustomListKinds try not to use this.  In general you want to have the scheme have the List types registered
-	scheme.AddKnownTypeWithName(schema.GroupVersionKind{Group: "fake-dynamic-client-group", Version: "v1", Kind: "List"}, &unstructured.UnstructuredList{})
+// and allow the default guessing for resources match.  Sometimes that doesn't work, so you can specify a custom mapping here.
+func NewSimpleDynamicClientWithCustomListKinds(scheme *runtime.Scheme, gvrToListKind map[schema.GroupVersionResource]string, objects ...runtime.Object) *FakeDynamicClient {
+	// In order to use List with this client, you have to have your lists registered so that the object tracker will find them
+	// in the scheme to support the t.scheme.New(listGVK) call when it's building the return value.
+	// Since the base fake client needs the listGVK passed through the action (in cases where there are no instances, it
+	// cannot look up the actual hits), we need to know a mapping of GVR to listGVK here.  For GETs and other types of calls,
+	// there is no return value that contains a GVK, so it doesn't have to know the mapping in advance.
+
+	// first we attempt to invert known List types from the scheme to auto guess the resource with unsafe guesses
+	// this covers common usage of registering types in scheme and passing them
+	completeGVRToListKind := map[schema.GroupVersionResource]string{}
+	for listGVK := range scheme.AllKnownTypes() {
+		if !strings.HasSuffix(listGVK.Kind, "List") {
+			continue
+		}
+		nonListGVK := listGVK.GroupVersion().WithKind(listGVK.Kind[:len(listGVK.Kind)-4])
+		plural, _ := meta.UnsafeGuessKindToResource(nonListGVK)
+		completeGVRToListKind[plural] = listGVK.Kind
+	}
+
+	for gvr, listKind := range gvrToListKind {
+		if !strings.HasSuffix(listKind, "List") {
+			panic("coding error, listGVK must end in List or this fake client doesn't work right")
+		}
+		listGVK := gvr.GroupVersion().WithKind(listKind)
+
+		// if we already have this type registered, just skip it
+		if _, err := scheme.New(listGVK); err == nil {
+			completeGVRToListKind[gvr] = listKind
+			continue
+		}
+
+		scheme.AddKnownTypeWithName(listGVK, &unstructured.UnstructuredList{})
+		completeGVRToListKind[gvr] = listKind
+	}
 
 	codecs := serializer.NewCodecFactory(scheme)
 	o := testing.NewObjectTracker(scheme, codecs.UniversalDecoder())
@@ -48,7 +83,7 @@ func NewSimpleDynamicClient(scheme *runtime.Scheme, objects ...runtime.Object) *
 		}
 	}
 
-	cs := &FakeDynamicClient{scheme: scheme}
+	cs := &FakeDynamicClient{scheme: scheme, gvrToListKind: completeGVRToListKind}
 	cs.AddReactor("*", "*", testing.ObjectReaction(o))
 	cs.AddWatchReactor("*", func(action testing.Action) (handled bool, ret watch.Interface, err error) {
 		gvr := action.GetResource()
@@ -69,18 +104,20 @@ func NewSimpleDynamicClient(scheme *runtime.Scheme, objects ...runtime.Object) *
 type FakeDynamicClient struct {
 	testing.Fake
 	scheme        *runtime.Scheme
+	gvrToListKind map[schema.GroupVersionResource]string
 }
 
 type dynamicResourceClient struct {
 	client    *FakeDynamicClient
 	namespace string
 	resource  schema.GroupVersionResource
+	listKind  string
 }
 
 var _ dynamic.Interface = &FakeDynamicClient{}
 
 func (c *FakeDynamicClient) Resource(resource schema.GroupVersionResource) dynamic.NamespaceableResourceInterface {
-	return &dynamicResourceClient{client: c, resource: resource}
+	return &dynamicResourceClient{client: c, resource: resource, listKind: c.gvrToListKind[resource]}
 }
 
 func (c *dynamicResourceClient) Namespace(ns string) dynamic.ResourceInterface {
@@ -276,16 +313,22 @@ func (c *dynamicResourceClient) Get(ctx context.Context, name string, opts metav
 }
 
 func (c *dynamicResourceClient) List(ctx context.Context, opts metav1.ListOptions) (*unstructured.UnstructuredList, error) {
+	if len(c.listKind) == 0 {
+		panic(fmt.Sprintf("coding error: you must register resource to list kind for every resource you're going to LIST when creating the client.  See NewSimpleDynamicClientWithCustomListKinds or register the list into the scheme: %v out of %v", c.resource, c.client.gvrToListKind))
+	}
+	listGVK := c.resource.GroupVersion().WithKind(c.listKind)
+	listForFakeClientGVK := c.resource.GroupVersion().WithKind(c.listKind[:len(c.listKind)-4]) /*base library appends List*/
+
 	var obj runtime.Object
 	var err error
 	switch {
 	case len(c.namespace) == 0:
 		obj, err = c.client.Fake.
-			Invokes(testing.NewRootListAction(c.resource, schema.GroupVersionKind{Group: "fake-dynamic-client-group", Version: "v1", Kind: "" /*List is appended by the tracker automatically*/}, opts), &metav1.Status{Status: "dynamic list fail"})
+			Invokes(testing.NewRootListAction(c.resource, listForFakeClientGVK, opts), &metav1.Status{Status: "dynamic list fail"})
 
 	case len(c.namespace) > 0:
 		obj, err = c.client.Fake.
-			Invokes(testing.NewListAction(c.resource, schema.GroupVersionKind{Group: "fake-dynamic-client-group", Version: "v1", Kind: "" /*List is appended by the tracker automatically*/}, c.namespace, opts), &metav1.Status{Status: "dynamic list fail"})
+			Invokes(testing.NewListAction(c.resource, listForFakeClientGVK, c.namespace, opts), &metav1.Status{Status: "dynamic list fail"})
 
 	}
 
@@ -309,6 +352,7 @@ func (c *dynamicResourceClient) List(ctx context.Context, opts metav1.ListOption
 
 	list := &unstructured.UnstructuredList{}
 	list.SetResourceVersion(entireList.GetResourceVersion())
+	list.GetObjectKind().SetGroupVersionKind(listGVK)
 	for i := range entireList.Items {
 		item := &entireList.Items[i]
 		metadata, err := meta.Accessor(item)

dynamic/fake/simple_test.go

@@ -59,10 +59,74 @@ func newUnstructuredWithSpec(spec map[string]interface{}) *unstructured.Unstruct
 	return u
 }
 
+func TestGet(t *testing.T) {
+	scheme := runtime.NewScheme()
+
+	client := NewSimpleDynamicClient(scheme, newUnstructured("group/version", "TheKind", "ns-foo", "name-foo"))
+	get, err := client.Resource(schema.GroupVersionResource{Group: "group", Version: "version", Resource: "thekinds"}).Namespace("ns-foo").Get(context.TODO(), "name-foo", metav1.GetOptions{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := &unstructured.Unstructured{
+		Object: map[string]interface{}{
+			"apiVersion": "group/version",
+			"kind":       "TheKind",
+			"metadata": map[string]interface{}{
+				"name":      "name-foo",
+				"namespace": "ns-foo",
+			},
+		},
+	}
+	if !equality.Semantic.DeepEqual(get, expected) {
+		t.Fatal(diff.ObjectGoPrintDiff(expected, get))
+	}
+}
+
+func TestListDecoding(t *testing.T) {
+	// this the duplication of logic from the real List API.  This will prove that our dynamic client actually returns the gvk
+	uncastObj, err := runtime.Decode(unstructured.UnstructuredJSONScheme, []byte(`{"apiVersion": "group/version", "kind": "TheKindList", "items":[]}`))
+	if err != nil {
+		t.Fatal(err)
+	}
+	list := uncastObj.(*unstructured.UnstructuredList)
+	expectedList := &unstructured.UnstructuredList{
+		Object: map[string]interface{}{
+			"apiVersion": "group/version",
+			"kind":       "TheKindList",
+		},
+		Items: []unstructured.Unstructured{},
+	}
+	if !equality.Semantic.DeepEqual(list, expectedList) {
+		t.Fatal(diff.ObjectGoPrintDiff(expectedList, list))
+	}
+}
+
+func TestGetDecoding(t *testing.T) {
+	// this the duplication of logic from the real Get API.  This will prove that our dynamic client actually returns the gvk
+	uncastObj, err := runtime.Decode(unstructured.UnstructuredJSONScheme, []byte(`{"apiVersion": "group/version", "kind": "TheKind"}`))
+	if err != nil {
+		t.Fatal(err)
+	}
+	get := uncastObj.(*unstructured.Unstructured)
+	expectedObj := &unstructured.Unstructured{
+		Object: map[string]interface{}{
+			"apiVersion": "group/version",
+			"kind":       "TheKind",
+		},
+	}
+	if !equality.Semantic.DeepEqual(get, expectedObj) {
+		t.Fatal(diff.ObjectGoPrintDiff(expectedObj, get))
+	}
+}
+
 func TestList(t *testing.T) {
 	scheme := runtime.NewScheme()
 
-	client := NewSimpleDynamicClient(scheme,
+	client := NewSimpleDynamicClientWithCustomListKinds(scheme,
+		map[schema.GroupVersionResource]string{
+			{Group: "group", Version: "version", Resource: "thekinds"}: "TheKindList",
+		},
 		newUnstructured("group/version", "TheKind", "ns-foo", "name-foo"),
 		newUnstructured("group2/version", "TheKind", "ns-foo", "name2-foo"),
 		newUnstructured("group/version", "TheKind", "ns-foo", "name-bar"),
@@ -87,7 +151,10 @@ func TestList(t *testing.T) {
 func Test_ListKind(t *testing.T) {
 	scheme := runtime.NewScheme()
 
-	client := NewSimpleDynamicClient(scheme,
+	client := NewSimpleDynamicClientWithCustomListKinds(scheme,
+		map[schema.GroupVersionResource]string{
+			{Group: "group", Version: "version", Resource: "thekinds"}: "TheKindList",
+		},
 		&unstructured.UnstructuredList{
 			Object: map[string]interface{}{
 				"apiVersion": "group/version",