refactored admission to avoid internal client references

pkg/kubeapiserver/admission/initializer.go

@@ -0,0 +1,77 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package admission
+
+import (
+	"k8s.io/kubernetes/pkg/admission"
+	"k8s.io/kubernetes/pkg/auth/authorizer"
+	"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
+	"k8s.io/kubernetes/pkg/controller/informers"
+)
+
+// TODO add a `WantsToRun` which takes a stopCh.  Might make it generic.
+
+// WantsInformerFactory defines a function which sets InformerFactory for admission plugins that need it
+type WantsInternalClientSet interface {
+	SetInternalClientSet(internalclientset.Interface)
+	admission.Validator
+}
+
+// WantsInformerFactory defines a function which sets InformerFactory for admission plugins that need it
+type WantsInformerFactory interface {
+	SetInformerFactory(informers.SharedInformerFactory)
+	admission.Validator
+}
+
+// WantsAuthorizer defines a function which sets Authorizer for admission plugins that need it.
+type WantsAuthorizer interface {
+	SetAuthorizer(authorizer.Authorizer)
+	admission.Validator
+}
+
+type pluginInitializer struct {
+	internalClient internalclientset.Interface
+	informers      informers.SharedInformerFactory
+	authorizer     authorizer.Authorizer
+}
+
+var _ admission.PluginInitializer = pluginInitializer{}
+
+// NewPluginInitializer constructs new instance of PluginInitializer
+func NewPluginInitializer(internalClient internalclientset.Interface, sharedInformers informers.SharedInformerFactory, authz authorizer.Authorizer) admission.PluginInitializer {
+	return pluginInitializer{
+		internalClient: internalClient,
+		informers:      sharedInformers,
+		authorizer:     authz,
+	}
+}
+
+// Initialize checks the initialization interfaces implemented by each plugin
+// and provide the appropriate initialization data
+func (i pluginInitializer) Initialize(plugin admission.Interface) {
+	if wants, ok := plugin.(WantsInternalClientSet); ok {
+		wants.SetInternalClientSet(i.internalClient)
+	}
+
+	if wants, ok := plugin.(WantsInformerFactory); ok {
+		wants.SetInformerFactory(i.informers)
+	}
+
+	if wants, ok := plugin.(WantsAuthorizer); ok {
+		wants.SetAuthorizer(i.authorizer)
+	}
+}