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Copyright 2018 The Knative 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
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.
package duck
import (
metav1 ""
// TypedInformerFactory implements InformerFactory such that the elements
// tracked by the informer/lister have the type of the canonical "obj".
type TypedInformerFactory struct {
Client dynamic.Interface
Type apis.Listable
ResyncPeriod time.Duration
StopChannel <-chan struct{}
// Check that TypedInformerFactory implements InformerFactory.
var _ InformerFactory = (*TypedInformerFactory)(nil)
// Get implements InformerFactory.
func (dif *TypedInformerFactory) Get(gvr schema.GroupVersionResource) (cache.SharedIndexInformer, cache.GenericLister, error) {
listObj := dif.Type.GetListType()
lw := &cache.ListWatch{
ListFunc: asStructuredLister(dif.Client.Resource(gvr).List, listObj),
WatchFunc: AsStructuredWatcher(dif.Client.Resource(gvr).Watch, dif.Type),
inf := cache.NewSharedIndexInformer(lw, dif.Type, dif.ResyncPeriod, cache.Indexers{
cache.NamespaceIndex: cache.MetaNamespaceIndexFunc,
lister := cache.NewGenericLister(inf.GetIndexer(), gvr.GroupResource())
go inf.Run(dif.StopChannel)
if ok := cache.WaitForCacheSync(dif.StopChannel, inf.HasSynced); !ok {
return nil, nil, fmt.Errorf("failed starting shared index informer for %v with type %T", gvr, dif.Type)
return inf, lister, nil
type unstructuredLister func(metav1.ListOptions) (*unstructured.UnstructuredList, error)
func asStructuredLister(ulist unstructuredLister, listObj runtime.Object) cache.ListFunc {
return func(opts metav1.ListOptions) (runtime.Object, error) {
ul, err := ulist(opts)
if err != nil {
return nil, err
res := listObj.DeepCopyObject()
if err := FromUnstructured(ul, res); err != nil {
return nil, err
return res, nil
// AsStructuredWatcher is public for testing only.
// TODO(mattmoor): Move tests for this to `package duck` and make private.
func AsStructuredWatcher(wf cache.WatchFunc, obj runtime.Object) cache.WatchFunc {
return func(lo metav1.ListOptions) (watch.Interface, error) {
uw, err := wf(lo)
if err != nil {
return nil, err
structuredCh := make(chan watch.Event)
go func() {
defer close(structuredCh)
unstructuredCh := uw.ResultChan()
for ue := range unstructuredCh {
unstructuredObj, ok := ue.Object.(*unstructured.Unstructured)
if !ok {
// If it isn't an unstructured object, then forward the
// event as-is. This is likely to happen when the event's
// Type is an Error.
structuredCh <- ue
structuredObj := obj.DeepCopyObject()
err := FromUnstructured(unstructuredObj, structuredObj)
if err != nil {
// Pass back an error indicating that the object we got
// was invalid.
structuredCh <- watch.Event{
Type: watch.Error,
Object: &metav1.Status{
Status: metav1.StatusFailure,
Code: http.StatusUnprocessableEntity,
Reason: metav1.StatusReasonInvalid,
Message: err.Error(),
// Send the structured event.
structuredCh <- watch.Event{
Type: ue.Type,
Object: structuredObj,
return NewProxyWatcher(structuredCh), nil
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