/
dependant.go
107 lines (84 loc) · 2.56 KB
/
dependant.go
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package predicates
import (
"reflect"
"github.com/wI2L/jsondiff"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/predicate"
)
var _ predicate.Predicate = DependentPredicate{}
type DependentPredicate struct {
WatchDelete bool
WatchUpdate bool
WatchStatus bool
predicate.Funcs
}
func (p DependentPredicate) Create(event.CreateEvent) bool {
return false
}
func (p DependentPredicate) Generic(event.GenericEvent) bool {
return false
}
func (p DependentPredicate) Delete(e event.DeleteEvent) bool {
if !p.WatchDelete {
return false
}
o, ok := e.Object.(*unstructured.Unstructured)
if !ok {
log.Error(nil, "unexpected object type", "gvk", e.Object.GetObjectKind().GroupVersionKind().String())
return false
}
log.Info("Reconciling due to dependent resource deletion",
"name", o.GetName(),
"namespace", o.GetNamespace(),
"apiVersion", o.GroupVersionKind().GroupVersion(),
"kind", o.GroupVersionKind().Kind)
return true
}
func (p DependentPredicate) Update(e event.UpdateEvent) bool {
if !p.WatchUpdate {
return false
}
if e.ObjectOld.GetResourceVersion() == e.ObjectNew.GetResourceVersion() {
return false
}
oldObj, ok := e.ObjectOld.(*unstructured.Unstructured)
if !ok {
log.Error(nil, "unexpected old object type", "gvk", e.ObjectOld.GetObjectKind().GroupVersionKind().String())
return false
}
newObj, ok := e.ObjectNew.(*unstructured.Unstructured)
if !ok {
log.Error(nil, "unexpected new object type", "gvk", e.ObjectOld.GetObjectKind().GroupVersionKind().String())
return false
}
oldObj = oldObj.DeepCopy()
newObj = newObj.DeepCopy()
if !p.WatchStatus {
// Update filters out events that change only the dependent resource
// status. It is not typical for the controller of a primary
// resource to write to the status of one its dependent resources.
delete(oldObj.Object, "status")
delete(newObj.Object, "status")
}
// Reset field not meaningful for comparison
oldObj.SetResourceVersion("")
newObj.SetResourceVersion("")
oldObj.SetManagedFields(nil)
newObj.SetManagedFields(nil)
if reflect.DeepEqual(oldObj.Object, newObj.Object) {
return false
}
patch, err := jsondiff.Compare(oldObj, newObj)
if err != nil {
log.Error(err, "failed to generate diff")
return true
}
log.Info("Reconciling due to dependent resource update",
"name", newObj.GetName(),
"namespace", newObj.GetNamespace(),
"apiVersion", newObj.GroupVersionKind().GroupVersion(),
"kind", newObj.GroupVersionKind().Kind,
"diff", patch.String())
return true
}