// 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
}
// TODO: make special List and Watch function that removes fields other than
// ObjectMeta.
func gcListWatcher(client *dynamic.Client, resource unversioned.GroupVersionResource) *cache.ListWatch {
return &cache.ListWatch{
ListFunc: func(options api.ListOptions) (runtime.Object, error) {
// APIResource.Kind is not used by the dynamic client, so
// leave it empty. We want to list this resource in all
// namespaces if it's namespace scoped, so leave
// APIResource.Namespaced as false is all right.
apiResource := unversioned.APIResource{Name: resource.Resource}
// The default parameter codec used by the dynamic client cannot
// encode api.ListOptions.
// TODO: api.ParameterCodec doesn't support thirdparty objects.
// We need a generic parameter codec.
return client.ParameterCodec(api.ParameterCodec).Resource(&apiResource, api.NamespaceAll).List(&options)
},
WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
// APIResource.Kind is not used by the dynamic client, so
// leave it empty. We want to list this resource in all
// namespaces if it's namespace scoped, so leave
// APIResource.Namespaced as false is all right.
apiResource := unversioned.APIResource{Name: resource.Resource}
// The default parameter codec used by the dynamic client cannot
// encode api.ListOptions.
return client.ParameterCodec(api.ParameterCodec).Resource(&apiResource, api.NamespaceAll).Watch(&options)
},
}
}
func (r *RegisteredRateLimiter) registerIfNotPresent(gv unversioned.GroupVersion, client *dynamic.Client, prefix string) {
once, found := r.rateLimiters[gv]
if !found {
return
}
once.Do(func() {
if rateLimiter := client.GetRateLimiter(); rateLimiter != nil {
group := strings.Replace(gv.Group, ".", ":", -1)
metrics.RegisterMetricAndTrackRateLimiterUsage(fmt.Sprintf("%s_%s_%s", prefix, group, gv.Version), rateLimiter)
}
})
}
func (r *RegisteredRateLimiter) registerIfNotPresent(gv unversioned.GroupVersion, client *dynamic.Client, prefix string) {
r.lock.RLock()
_, ok := r.rateLimiters[gv]
r.lock.RUnlock()
if ok {
return
}
r.lock.Lock()
defer r.lock.Unlock()
if _, ok := r.rateLimiters[gv]; !ok {
if rateLimiter := client.GetRateLimiter(); rateLimiter != nil {
group := strings.Replace(gv.Group, ".", ":", -1)
metrics.RegisterMetricAndTrackRateLimiterUsage(fmt.Sprintf("%s_%s_%s", prefix, group, gv.Version), rateLimiter)
}
r.rateLimiters[gv] = struct{}{}
}
}
// deleteCollection is a helper function that will delete the collection of resources
// it returns true if the operation was supported on the server.
// it returns an error if the operation was supported on the server but was unable to complete.
func deleteCollection(
dynamicClient *dynamic.Client,
opCache operationNotSupportedCache,
gvr unversioned.GroupVersionResource,
namespace string,
) (bool, error) {
glog.V(5).Infof("namespace controller - deleteCollection - namespace: %s, gvr: %v", namespace, gvr)
key := operationKey{op: operationDeleteCollection, gvr: gvr}
if !opCache.isSupported(key) {
glog.V(5).Infof("namespace controller - deleteCollection ignored since not supported - namespace: %s, gvr: %v", namespace, gvr)
return false, nil
}
apiResource := unversioned.APIResource{Name: gvr.Resource, Namespaced: true}
// namespace controller does not want the garbage collector to insert the orphan finalizer since it calls
// resource deletions generically. it will ensure all resources in the namespace are purged prior to releasing
// namespace itself.
orphanDependents := false
err := dynamicClient.Resource(&apiResource, namespace).DeleteCollection(&v1.DeleteOptions{OrphanDependents: &orphanDependents}, &v1.ListOptions{})
if err == nil {
return 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 - deleteCollection not supported - namespace: %s, gvr: %v", namespace, gvr)
opCache[key] = true
return false, nil
}
glog.V(5).Infof("namespace controller - deleteCollection unexpected error - namespace: %s, gvr: %v, error: %v", namespace, gvr, err)
return 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.Name, nil); err != nil && !errors.IsNotFound(err) && !errors.IsMethodNotSupported(err) {
return err
}
}
return nil
}
func gcListWatcher(client *dynamic.Client, resource unversioned.GroupVersionResource) *cache.ListWatch {
return &cache.ListWatch{
ListFunc: func(options api.ListOptions) (runtime.Object, error) {
// APIResource.Kind is not used by the dynamic client, so
// leave it empty. We want to list this resource in all
// namespaces if it's namespace scoped, so leave
// APIResource.Namespaced as false is all right.
apiResource := unversioned.APIResource{Name: resource.Resource}
return client.ParameterCodec(dynamic.VersionedParameterEncoderWithV1Fallback).
Resource(&apiResource, api.NamespaceAll).
List(&options)
},
WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
// APIResource.Kind is not used by the dynamic client, so
// leave it empty. We want to list this resource in all
// namespaces if it's namespace scoped, so leave
// APIResource.Namespaced as false is all right.
apiResource := unversioned.APIResource{Name: resource.Resource}
return client.ParameterCodec(dynamic.VersionedParameterEncoderWithV1Fallback).
Resource(&apiResource, api.NamespaceAll).
Watch(&options)
},
}
}