change cluster schema (#2026)

* change cluster schema

* change cluster schema

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

@@ -0,0 +1,76 @@
+/*
+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 (
+	"fmt"
+	"reflect"
+	"sort"
+	"strings"
+
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+
+	fedv1a1 "sigs.k8s.io/kubefed/pkg/apis/core/v1alpha1"
+)
+
+const (
+	generationPrefix      = "gen:"
+	resourceVersionPrefix = "rv:"
+)
+
+// ObjectVersion retrieves the field type-prefixed value used for
+// determining currency of the given cluster object.
+func ObjectVersion(clusterObj *unstructured.Unstructured) string {
+	generation := clusterObj.GetGeneration()
+	if generation != 0 {
+		return fmt.Sprintf("%s%d", generationPrefix, generation)
+	}
+	return fmt.Sprintf("%s%s", resourceVersionPrefix, clusterObj.GetResourceVersion())
+}
+
+// ObjectNeedsUpdate determines whether the 2 objects provided cluster
+// object needs to be updated according to the desired object and the
+// recorded version.
+func ObjectNeedsUpdate(desiredObj, clusterObj *unstructured.Unstructured, recordedVersion string) bool {
+	targetVersion := ObjectVersion(clusterObj)
+
+	if recordedVersion != targetVersion {
+		return true
+	}
+
+	// If versions match and the version is sourced from the
+	// generation field, a further check of metadata equivalency is
+	// required.
+	return strings.HasPrefix(targetVersion, generationPrefix) && !ObjectMetaObjEquivalent(desiredObj, clusterObj)
+}
+
+// SortClusterVersions ASCII sorts the given cluster versions slice
+// based on cluster name.
+func SortClusterVersions(versions []fedv1a1.ClusterObjectVersion) {
+	sort.Slice(versions, func(i, j int) bool {
+		return versions[i].ClusterName < versions[j].ClusterName
+	})
+}
+
+// PropagatedVersionStatusEquivalent returns true if both statuses are equal by
+// comparing Template and Override version, and their ClusterVersion slices;
+// false otherwise.
+func PropagatedVersionStatusEquivalent(pvs1, pvs2 *fedv1a1.PropagatedVersionStatus) bool {
+	return pvs1.TemplateVersion == pvs2.TemplateVersion &&
+		pvs1.OverrideVersion == pvs2.OverrideVersion &&
+		reflect.DeepEqual(pvs1.ClusterVersions, pvs2.ClusterVersions)
+}