Merge pull request #50374 from p0lyn0mial/sample_server_wire_admission

Automatic merge from submit-queue (batch tested with PRs 50386, 50374, 50444, 50382)

wires ban flunder admission plugin to the sample server

**What this PR does / why we need it**:
this PR wires ban flunder admission plugin to the sample server.

**Release note**:

```
NONE
```

staging/src/k8s.io/sample-apiserver/pkg/admission/plugin/banflunder/admission.go

@@ -18,6 +18,7 @@ package banflunder
 
 import (
 	"fmt"
+	"io"
 
 	"k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/labels"
@@ -28,6 +29,13 @@ import (
 	listers "k8s.io/sample-apiserver/pkg/client/listers_generated/wardle/internalversion"
 )
 
+// Register registers a plugin
+func Register(plugins *admission.Plugins) {
+	plugins.Register("BanFlunder", func(config io.Reader) (admission.Interface, error) {
+		return New()
+	})
+}
+
 type disallowFlunder struct {
 	*admission.Handler
 	lister listers.FischerLister
@@ -80,5 +88,7 @@ func (d *disallowFlunder) Validate() error {
 
 // New creates a new ban flunder admission plugin
 func New() (admission.Interface, error) {
-	return &disallowFlunder{}, nil
+	return &disallowFlunder{
+		Handler: admission.NewHandler(admission.Create),
+	}, nil
 }

staging/src/k8s.io/sample-apiserver/pkg/apiserver/BUILD

@@ -33,6 +33,7 @@ go_library(
         "//vendor/k8s.io/sample-apiserver/pkg/apis/wardle:go_default_library",
         "//vendor/k8s.io/sample-apiserver/pkg/apis/wardle/install:go_default_library",
         "//vendor/k8s.io/sample-apiserver/pkg/apis/wardle/v1alpha1:go_default_library",
+        "//vendor/k8s.io/sample-apiserver/pkg/client/informers_generated/internalversion:go_default_library",
         "//vendor/k8s.io/sample-apiserver/pkg/registry:go_default_library",
         "//vendor/k8s.io/sample-apiserver/pkg/registry/wardle/fischer:go_default_library",
         "//vendor/k8s.io/sample-apiserver/pkg/registry/wardle/flunder:go_default_library",

staging/src/k8s.io/sample-apiserver/pkg/apiserver/apiserver.go

@@ -30,6 +30,7 @@ import (
 	"k8s.io/sample-apiserver/pkg/apis/wardle"
 	"k8s.io/sample-apiserver/pkg/apis/wardle/install"
 	"k8s.io/sample-apiserver/pkg/apis/wardle/v1alpha1"
+	informers "k8s.io/sample-apiserver/pkg/client/informers_generated/internalversion"
 	wardleregistry "k8s.io/sample-apiserver/pkg/registry"
 	fischerstorage "k8s.io/sample-apiserver/pkg/registry/wardle/fischer"
 	flunderstorage "k8s.io/sample-apiserver/pkg/registry/wardle/flunder"
@@ -62,6 +63,8 @@ func init() {
 
 type Config struct {
 	GenericConfig *genericapiserver.Config
+	// SharedInformerFactory provides shared informers for resources
+	SharedInformerFactory informers.SharedInformerFactory
 }
 
 // WardleServer contains state for a Kubernetes cluster master/api server.

staging/src/k8s.io/sample-apiserver/pkg/cmd/server/BUILD

@@ -15,8 +15,12 @@ go_library(
         "//vendor/github.com/spf13/cobra:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/server:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/server/options:go_default_library",
+        "//vendor/k8s.io/sample-apiserver/pkg/admission/plugin/banflunder:go_default_library",
+        "//vendor/k8s.io/sample-apiserver/pkg/admission/wardleinitializer:go_default_library",
         "//vendor/k8s.io/sample-apiserver/pkg/apis/wardle/v1alpha1:go_default_library",
         "//vendor/k8s.io/sample-apiserver/pkg/apiserver:go_default_library",
+        "//vendor/k8s.io/sample-apiserver/pkg/client/clientset_generated/internalclientset:go_default_library",
+        "//vendor/k8s.io/sample-apiserver/pkg/client/informers_generated/internalversion:go_default_library",
     ],
 )
 

staging/src/k8s.io/sample-apiserver/pkg/cmd/server/start.go

@@ -25,8 +25,12 @@ import (
 
 	genericapiserver "k8s.io/apiserver/pkg/server"
 	genericoptions "k8s.io/apiserver/pkg/server/options"
+	"k8s.io/sample-apiserver/pkg/admission/plugin/banflunder"
+	"k8s.io/sample-apiserver/pkg/admission/wardleinitializer"
 	"k8s.io/sample-apiserver/pkg/apis/wardle/v1alpha1"
 	"k8s.io/sample-apiserver/pkg/apiserver"
+	clientset "k8s.io/sample-apiserver/pkg/client/clientset_generated/internalclientset"
+	informers "k8s.io/sample-apiserver/pkg/client/informers_generated/internalversion"
 )
 
 const defaultEtcdPathPrefix = "/registry/wardle.kubernetes.io"
@@ -88,6 +92,9 @@ func (o *WardleServerOptions) Complete() error {
 }
 
 func (o WardleServerOptions) Config() (*apiserver.Config, error) {
+	// register admission plugins
+	banflunder.Register(o.Admission.Plugins)
+
 	// TODO have a "real" external address
 	if err := o.RecommendedOptions.SecureServing.MaybeDefaultWithSelfSignedCerts("localhost", nil, []net.IP{net.ParseIP("127.0.0.1")}); err != nil {
 		return nil, fmt.Errorf("error creating self-signed certificates: %v", err)
@@ -98,12 +105,23 @@ func (o WardleServerOptions) Config() (*apiserver.Config, error) {
 		return nil, err
 	}
 
-	if err := o.Admission.ApplyTo(serverConfig); err != nil {
+	client, err := clientset.NewForConfig(serverConfig.LoopbackClientConfig)
+	if err != nil {
+		return nil, err
+	}
+	informerFactory := informers.NewSharedInformerFactory(client, serverConfig.LoopbackClientConfig.Timeout)
+	admissionInitializer, err := wardleinitializer.New(informerFactory)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := o.Admission.ApplyTo(serverConfig, admissionInitializer); err != nil {
 		return nil, err
 	}
 
 	config := &apiserver.Config{
 		GenericConfig:         serverConfig,
+		SharedInformerFactory: informerFactory,
 	}
 	return config, nil
 }
@@ -118,5 +136,11 @@ func (o WardleServerOptions) RunWardleServer(stopCh <-chan struct{}) error {
 	if err != nil {
 		return err
 	}
+
+	server.GenericAPIServer.AddPostStartHook("start-sample-server-informers", func(context genericapiserver.PostStartHookContext) error {
+		config.SharedInformerFactory.Start(context.StopCh)
+		return nil
+	})
+
 	return server.GenericAPIServer.PrepareRun().Run(stopCh)
 }