#55183 follow up: Reinstate admission chain composition and ns test

Kubernetes-commit: d82ae45a4cf7e34cf02755b7eaa6e040da590d67

pkg/admission/chain.go

@@ -29,7 +29,7 @@ func NewChainHandler(handlers ...NamedHandler) chainAdmissionHandler {
 
 func NewNamedHandler(name string, i Interface) NamedHandler {
 	return &pluginHandler{
-		i:    i,
+		Interface: i,
 		name:      name,
 	}
 }
@@ -49,10 +49,10 @@ func (admissionHandler chainAdmissionHandler) Admit(a Attributes) error {
 
 func (admissionHandler chainAdmissionHandler) admit(a Attributes) error {
 	for _, handler := range admissionHandler {
-		if !handler.Interface().Handles(a.GetOperation()) {
+		if !handler.Handles(a.GetOperation()) {
 			continue
 		}
-		if mutator, ok := handler.Interface().(MutationInterface); ok {
+		if mutator, ok := handler.(MutationInterface); ok {
 			t := time.Now()
 			err := mutator.Admit(a)
 			Metrics.ObserveAdmissionController(time.Since(t), err != nil, handler, a, stepAdmit)
@@ -74,10 +74,10 @@ func (admissionHandler chainAdmissionHandler) Validate(a Attributes) error {
 
 func (admissionHandler chainAdmissionHandler) validate(a Attributes) (err error) {
 	for _, handler := range admissionHandler {
-		if !handler.Interface().Handles(a.GetOperation()) {
+		if !handler.Handles(a.GetOperation()) {
 			continue
 		}
-		if validator, ok := handler.Interface().(ValidationInterface); ok {
+		if validator, ok := handler.(ValidationInterface); ok {
 			t := time.Now()
 			err := validator.Validate(a)
 			Metrics.ObserveAdmissionController(time.Since(t), err != nil, handler, a, stepValidate)
@@ -92,7 +92,7 @@ func (admissionHandler chainAdmissionHandler) validate(a Attributes) (err error)
 // Handles will return true if any of the handlers handles the given operation
 func (admissionHandler chainAdmissionHandler) Handles(operation Operation) bool {
 	for _, handler := range admissionHandler {
-		if handler.Interface().Handles(operation) {
+		if handler.Handles(operation) {
 			return true
 		}
 	}

pkg/admission/chain_test.go

@@ -93,7 +93,7 @@ func TestAdmitAndValidate(t *testing.T) {
 			t.Errorf("unexpected result of admit call: %v", accepted)
 		}
 		for _, h := range test.chain {
-			fake := h.Interface().(*FakeHandler)
+			fake := h.(*FakeHandler)
 			_, shouldBeCalled := test.calls[h.Name()]
 			if shouldBeCalled != fake.admitCalled {
 				t.Errorf("admit handler %s not called as expected: %v", h.Name(), fake.admitCalled)
@@ -120,7 +120,7 @@ func TestAdmitAndValidate(t *testing.T) {
 			t.Errorf("unexpected result of validate call: %v\n", accepted)
 		}
 		for _, h := range test.chain {
-			fake := h.Interface().(*FakeHandler)
+			fake := h.(*FakeHandler)
 
 			_, shouldBeCalled := test.calls[h.Name()]
 			if shouldBeCalled != fake.validateCalled {

pkg/admission/metrics.go

@@ -41,7 +41,7 @@ var (
 
 // NamedHandler requires each admission.Interface be named, primarly for metrics tracking purposes.
 type NamedHandler interface {
-	Interface() Interface
+	Interface
 	Name() string
 }
 

pkg/admission/plugins.go

@@ -41,14 +41,10 @@ type Plugins struct {
 
 // pluginHandler associates name with a admission.Interface handler.
 type pluginHandler struct {
-	i    Interface
+	Interface
 	name string
 }
 
-func (h *pluginHandler) Interface() Interface {
-	return h.i
-}
-
 func (h *pluginHandler) Name() string {
 	return h.name
 }
@@ -147,7 +143,7 @@ func (ps *Plugins) NewFromPlugins(pluginNames []string, configProvider ConfigPro
 			return nil, err
 		}
 		if plugin != nil {
-			handler := &pluginHandler{i: plugin, name: pluginName}
+			handler := &pluginHandler{Interface: plugin, name: pluginName}
 			handlers = append(handlers, handler)
 		}
 	}

pkg/admission/testutil_test.go

@@ -28,11 +28,16 @@ import (
 // methods have been called and always returns an error if admit is false.
 type FakeHandler struct {
 	*Handler
+	name           string
 	admit          bool
 	admitCalled    bool
 	validateCalled bool
 }
 
+func (h *FakeHandler) Name() string {
+	return h.name
+}
+
 func (h *FakeHandler) Admit(a Attributes) (err error) {
 	h.admitCalled = true
 	if h.admit {
@@ -57,12 +62,10 @@ func makeHandler(admit bool, ops ...Operation) *FakeHandler {
 }
 
 func makeNamedHandler(name string, admit bool, ops ...Operation) NamedHandler {
-	return &pluginHandler{
+	return &FakeHandler{
-		i: &FakeHandler{
+		name:    name,
 		admit:   admit,
 		Handler: NewHandler(ops...),
-		},
-		name: name,
 	}
 }
 
@@ -90,7 +93,7 @@ func makeValidatingHandler(validate bool, ops ...Operation) *FakeValidatingHandl
 
 func makeValidatingNamedHandler(name string, validate bool, ops ...Operation) NamedHandler {
 	return &pluginHandler{
-		i: &FakeValidatingHandler{
+		Interface: &FakeValidatingHandler{
 			validate: validate,
 			Handler:  NewHandler(ops...),
 		},