// listCollection will list the items in the specified namespace
// it returns the following:
// the list of items in the collection (if found)
// a boolean if the operation is supported
// an error if the operation is supported but could not be completed.
func listCollection(
dynamicClient *dynamic.Client,
opCache operationNotSupportedCache,
gvr unversioned.GroupVersionResource,
namespace string,
) (*runtime.UnstructuredList, bool, error) {
glog.V(5).Infof("namespace controller - listCollection - namespace: %s, gvr: %v", namespace, gvr)
key := operationKey{op: operationList, gvr: gvr}
if !opCache.isSupported(key) {
glog.V(5).Infof("namespace controller - listCollection ignored since not supported - namespace: %s, gvr: %v", namespace, gvr)
return nil, false, nil
}
apiResource := unversioned.APIResource{Name: gvr.Resource, Namespaced: true}
unstructuredList, err := dynamicClient.Resource(&apiResource, namespace).List(&v1.ListOptions{})
if err == nil {
return unstructuredList, true, nil
}
// this is strange, but we need to special case for both MethodNotSupported and NotFound errors
// TODO: https://github.com/kubernetes/kubernetes/issues/22413
// we have a resource returned in the discovery API that supports no top-level verbs:
// /apis/extensions/v1beta1/namespaces/default/replicationcontrollers
// when working with this resource type, we will get a literal not found error rather than expected method not supported
// remember next time that this resource does not support delete collection...
if errors.IsMethodNotSupported(err) || errors.IsNotFound(err) {
glog.V(5).Infof("namespace controller - listCollection not supported - namespace: %s, gvr: %v", namespace, gvr)
opCache[key] = true
return nil, false, nil
}
return nil, true, err
}
// deleteEachItem is a helper function that will list the collection of resources and delete each item 1 by 1.
func deleteEachItem(
dynamicClient *dynamic.Client,
opCache operationNotSupportedCache,
gvr unversioned.GroupVersionResource,
namespace string,
) error {
glog.V(5).Infof("namespace controller - deleteEachItem - namespace: %s, gvr: %v", namespace, gvr)
unstructuredList, listSupported, err := listCollection(dynamicClient, opCache, gvr, namespace)
if err != nil {
return err
}
if !listSupported {
return nil
}
apiResource := unversioned.APIResource{Name: gvr.Resource, Namespaced: true}
for _, item := range unstructuredList.Items {
if err = dynamicClient.Resource(&apiResource, namespace).Delete(item.GetName(), nil); err != nil && !errors.IsNotFound(err) && !errors.IsMethodNotSupported(err) {
return err
}
}
return nil
}