89 lines
3.1 KiB
Go
89 lines
3.1 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// This code is lifted from the kubefed codebase. It's a list of functions to determine whether the provided cluster
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// object needs to be updated according to the desired object and the recorded version.
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// For reference:
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// https://github.com/kubernetes-sigs/kubefed/blob/master/pkg/controller/util/propagatedversion.go#L30-L59
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// https://github.com/kubernetes-sigs/kubefed/blob/master/pkg/controller/util/meta.go#L63-L80
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package lifted
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import (
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"fmt"
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"reflect"
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"strings"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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)
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const (
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generationPrefix = "gen:"
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resourceVersionPrefix = "rv:"
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)
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// +lifted-source: https://github.com/kubernetes-sigs/kubefed/blob/master/pkg/controller/util/propagatedversion.go#L35-L43
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// ObjectVersion retrieves the field type-prefixed value used for
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// determining currency of the given cluster object.
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func ObjectVersion(clusterObj *unstructured.Unstructured) string {
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generation := clusterObj.GetGeneration()
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if generation != 0 {
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return fmt.Sprintf("%s%d", generationPrefix, generation)
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}
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return fmt.Sprintf("%s%s", resourceVersionPrefix, clusterObj.GetResourceVersion())
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}
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// +lifted-source: https://github.com/kubernetes-sigs/kubefed/blob/master/pkg/controller/util/propagatedversion.go#L45-L59
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// ObjectNeedsUpdate determines whether the 2 objects provided cluster
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// object needs to be updated according to the desired object and the
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// recorded version.
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func ObjectNeedsUpdate(desiredObj, clusterObj *unstructured.Unstructured, recordedVersion string) bool {
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targetVersion := ObjectVersion(clusterObj)
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if recordedVersion != targetVersion {
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return true
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}
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// If versions match and the version is sourced from the
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// generation field, a further check of metadata equivalency is
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// required.
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return strings.HasPrefix(targetVersion, generationPrefix) && !objectMetaObjEquivalent(desiredObj, clusterObj)
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}
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// +lifted-source: https://github.com/kubernetes-sigs/kubefed/blob/master/pkg/controller/util/meta.go#L63-L80
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// +lifted-changed
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// objectMetaObjEquivalent checks if cluster-independent, user provided data in two given ObjectMeta are equal. If in
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// the future the ObjectMeta structure is expanded then any field that is not populated
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// by the api server should be included here.
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func objectMetaObjEquivalent(a, b metav1.Object) bool {
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if a.GetName() != b.GetName() {
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return false
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}
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if a.GetNamespace() != b.GetNamespace() {
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return false
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}
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aLabels := a.GetLabels()
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bLabels := b.GetLabels()
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if !reflect.DeepEqual(aLabels, bLabels) && (len(aLabels) != 0 || len(bLabels) != 0) {
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return false
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}
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return true
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}
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