Initial commit

vendor/sigs.k8s.io/controller-runtime/pkg/client/split.go

@@ -0,0 +1,59 @@
+/*
+Copyright 2018 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 client
+
+import (
+	"context"
+
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime"
+)
+
+// DelegatingClient forms an interface Client by composing separate
+// reader, writer and statusclient interfaces.  This way, you can have an Client that
+// reads from a cache and writes to the API server.
+type DelegatingClient struct {
+	Reader
+	Writer
+	StatusClient
+}
+
+// DelegatingReader forms a interface Reader that will cause Get and List
+// requests for unstructured types to use the ClientReader while
+// requests for any other type of object with use the CacheReader.
+type DelegatingReader struct {
+	CacheReader  Reader
+	ClientReader Reader
+}
+
+// Get retrieves an obj for a given object key from the Kubernetes Cluster.
+func (d *DelegatingReader) Get(ctx context.Context, key ObjectKey, obj runtime.Object) error {
+	_, isUnstructured := obj.(*unstructured.Unstructured)
+	if isUnstructured {
+		return d.ClientReader.Get(ctx, key, obj)
+	}
+	return d.CacheReader.Get(ctx, key, obj)
+}
+
+// List retrieves list of objects for a given namespace and list options.
+func (d *DelegatingReader) List(ctx context.Context, opts *ListOptions, list runtime.Object) error {
+	_, isUnstructured := list.(*unstructured.UnstructuredList)
+	if isUnstructured {
+		return d.ClientReader.List(ctx, opts, list)
+	}
+	return d.CacheReader.List(ctx, opts, list)
+}