change cluster schema (#2026)

* change cluster schema

* change cluster schema

vendor/sigs.k8s.io/kubefed/pkg/controller/util/placement.go

@@ -0,0 +1,88 @@
+/*
+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 util
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/labels"
+)
+
+type GenericClusterReference struct {
+	Name string `json:"name"`
+}
+
+type GenericPlacementFields struct {
+	Clusters        []GenericClusterReference `json:"clusters,omitempty"`
+	ClusterSelector *metav1.LabelSelector     `json:"clusterSelector,omitempty"`
+}
+
+type GenericPlacementSpec struct {
+	Placement GenericPlacementFields `json:"placement,omitempty"`
+}
+
+type GenericPlacement struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	Spec GenericPlacementSpec `json:"spec,omitempty"`
+}
+
+func UnmarshalGenericPlacement(obj *unstructured.Unstructured) (*GenericPlacement, error) {
+	placement := &GenericPlacement{}
+	err := UnstructuredToInterface(obj, placement)
+	if err != nil {
+		return nil, err
+	}
+	return placement, nil
+}
+
+func (p *GenericPlacement) ClusterNames() []string {
+	if p.Spec.Placement.Clusters == nil {
+		return nil
+	}
+	clusterNames := []string{}
+	for _, cluster := range p.Spec.Placement.Clusters {
+		clusterNames = append(clusterNames, cluster.Name)
+	}
+	return clusterNames
+}
+
+func (p *GenericPlacement) ClusterSelector() (labels.Selector, error) {
+	return metav1.LabelSelectorAsSelector(p.Spec.Placement.ClusterSelector)
+}
+
+func GetClusterNames(obj *unstructured.Unstructured) ([]string, error) {
+	placement, err := UnmarshalGenericPlacement(obj)
+	if err != nil {
+		return nil, err
+	}
+	return placement.ClusterNames(), nil
+}
+
+func SetClusterNames(obj *unstructured.Unstructured, clusterNames []string) error {
+	var clusters []interface{}
+	if clusterNames != nil {
+		clusters = []interface{}{}
+		for _, clusterName := range clusterNames {
+			clusters = append(clusters, map[string]interface{}{
+				NameField: clusterName,
+			})
+		}
+	}
+	return unstructured.SetNestedSlice(obj.Object, clusters, SpecField, PlacementField, ClustersField)
+}