79 lines
2.4 KiB
Go
79 lines
2.4 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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package util
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import (
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"fmt"
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"reflect"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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pkgruntime "k8s.io/apimachinery/pkg/runtime"
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"k8s.io/kubernetes/pkg/client/cache"
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)
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// Returns cache.ResourceEventHandlerFuncs that trigger the given function
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// on all object changes.
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func NewTriggerOnAllChanges(triggerFunc func(pkgruntime.Object)) *cache.ResourceEventHandlerFuncs {
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return &cache.ResourceEventHandlerFuncs{
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DeleteFunc: func(old interface{}) {
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oldObj := old.(pkgruntime.Object)
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triggerFunc(oldObj)
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},
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AddFunc: func(cur interface{}) {
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curObj := cur.(pkgruntime.Object)
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triggerFunc(curObj)
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},
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UpdateFunc: func(old, cur interface{}) {
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curObj := cur.(pkgruntime.Object)
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if !reflect.DeepEqual(old, cur) {
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triggerFunc(curObj)
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}
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},
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}
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}
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// Returns cache.ResourceEventHandlerFuncs that trigger the given function
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// on object add and delete as well as spec/object meta on update.
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func NewTriggerOnMetaAndSpecChanges(triggerFunc func(pkgruntime.Object)) *cache.ResourceEventHandlerFuncs {
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getFieldOrPanic := func(obj interface{}, fieldName string) interface{} {
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val := reflect.ValueOf(obj).Elem().FieldByName(fieldName)
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if val.IsValid() {
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return val.Interface()
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} else {
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panic(fmt.Errorf("field not found: %s", fieldName))
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}
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}
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return &cache.ResourceEventHandlerFuncs{
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DeleteFunc: func(old interface{}) {
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oldObj := old.(pkgruntime.Object)
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triggerFunc(oldObj)
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},
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AddFunc: func(cur interface{}) {
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curObj := cur.(pkgruntime.Object)
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triggerFunc(curObj)
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},
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UpdateFunc: func(old, cur interface{}) {
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curObj := cur.(pkgruntime.Object)
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oldMeta := getFieldOrPanic(old, "ObjectMeta").(metav1.ObjectMeta)
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curMeta := getFieldOrPanic(cur, "ObjectMeta").(metav1.ObjectMeta)
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if !ObjectMetaEquivalent(oldMeta, curMeta) ||
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!reflect.DeepEqual(getFieldOrPanic(old, "Spec"), getFieldOrPanic(cur, "Spec")) {
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triggerFunc(curObj)
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}
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},
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}
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}
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