k3s/vendor/github.com/rancher/wrangler/pkg/generic/remove.go
2019-12-15 23:28:25 -07:00

120 lines
2.3 KiB
Go

package generic
import (
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
)
var (
finalizerKey = "wrangler.cattle.io/"
)
type Updater func(runtime.Object) (runtime.Object, error)
type objectLifecycleAdapter struct {
name string
handler Handler
updater Updater
}
func NewRemoveHandler(name string, updater Updater, handler Handler) Handler {
o := objectLifecycleAdapter{
name: name,
handler: handler,
updater: updater,
}
return o.sync
}
func (o *objectLifecycleAdapter) sync(key string, obj runtime.Object) (runtime.Object, error) {
if obj == nil {
return nil, nil
}
metadata, err := meta.Accessor(obj)
if err != nil {
return obj, err
}
if metadata.GetDeletionTimestamp() == nil {
return o.addFinalizer(obj)
}
if !o.hasFinalizer(obj) {
return obj, nil
}
newObj, err := o.handler(key, obj)
if err != nil {
return newObj, err
}
if newObj != nil {
obj = newObj
}
return o.removeFinalizer(obj)
}
func (o *objectLifecycleAdapter) constructFinalizerKey() string {
return finalizerKey + o.name
}
func (o *objectLifecycleAdapter) hasFinalizer(obj runtime.Object) bool {
metadata, err := meta.Accessor(obj)
if err != nil {
return false
}
finalizerKey := o.constructFinalizerKey()
finalizers := metadata.GetFinalizers()
for _, finalizer := range finalizers {
if finalizer == finalizerKey {
return true
}
}
return false
}
func (o *objectLifecycleAdapter) removeFinalizer(obj runtime.Object) (runtime.Object, error) {
if !o.hasFinalizer(obj) {
return obj, nil
}
obj = obj.DeepCopyObject()
metadata, err := meta.Accessor(obj)
if err != nil {
return obj, err
}
finalizerKey := o.constructFinalizerKey()
finalizers := metadata.GetFinalizers()
var newFinalizers []string
for k, v := range finalizers {
if v != finalizerKey {
continue
}
newFinalizers = append(finalizers[:k], finalizers[k+1:]...)
}
metadata.SetFinalizers(newFinalizers)
return o.updater(obj)
}
func (o *objectLifecycleAdapter) addFinalizer(obj runtime.Object) (runtime.Object, error) {
if o.hasFinalizer(obj) {
return obj, nil
}
obj = obj.DeepCopyObject()
metadata, err := meta.Accessor(obj)
if err != nil {
return nil, err
}
metadata.SetFinalizers(append(metadata.GetFinalizers(), o.constructFinalizerKey()))
return o.updater(obj)
}