Implement basic admission control framework

pkg/admission/interfaces.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+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 (
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
+)
+
+// Attributes is an interface used by AdmissionController to get information about a request
+// that is used to make an admission decision.
+type Attributes interface {
+	GetClient() client.Interface
+	GetNamespace() string
+	GetKind() string
+	GetOperation() string
+	GetObject() runtime.Object
+}
+
+// Interface is an abstract, pluggable interface for Admission Control decisions.
+type Interface interface {
+	// Admit makes an admission decision based on the request attributes
+	Admit(a Attributes) (err error)
+}
+
+// AdmissionControl is responsible for performing Admission control decisions
+type AdmissionControl interface {
+	AdmissionControl(operation, kind, namespace string, object runtime.Object) (err error)
+}