// It enforces life-cycle constraints around a Namespace depending on its Phase
type lifecycle struct {
*admission.Handler
client clientset.Interface
immortalNamespaces sets.String
namespaceInformer cache.SharedIndexInformer
// forceLiveLookupCache holds a list of entries for namespaces that we have a strong reason to believe are stale in our local cache.
// if a namespace is in this cache, then we will ignore our local state and always fetch latest from api server.
forceLiveLookupCache *lru.Cache
}
type forceLiveLookupEntry struct {
expiry time.Time
}
var _ = admission.WantsInformerFactory(&lifecycle{})
func makeNamespaceKey(namespace string) *api.Namespace {
return &api.Namespace{
ObjectMeta: api.ObjectMeta{
Name: namespace,
Namespace: "",
},
}
}
func (l *lifecycle) Admit(a admission.Attributes) error {
// prevent deletion of immortal namespaces
if a.GetOperation() == admission.Delete && a.GetKind().GroupKind() == api.Kind("Namespace") && l.immortalNamespaces.Has(a.GetName()) {
return errors.NewForbidden(a.GetResource().GroupResource(), a.GetName(), fmt.Errorf("this namespace may not be deleted"))
}
func init() {
admission.RegisterPlugin("NamespaceAutoProvision", func(client clientset.Interface, config io.Reader) (admission.Interface, error) {
return NewProvision(client), nil
})
}
// provision is an implementation of admission.Interface.
// It looks at all incoming requests in a namespace context, and if the namespace does not exist, it creates one.
// It is useful in deployments that do not want to restrict creation of a namespace prior to its usage.
type provision struct {
*admission.Handler
client clientset.Interface
namespaceInformer cache.SharedIndexInformer
}
var _ = admission.WantsInformerFactory(&provision{})
func (p *provision) Admit(a admission.Attributes) (err error) {
// if we're here, then we've already passed authentication, so we're allowed to do what we're trying to do
// if we're here, then the API server has found a route, which means that if we have a non-empty namespace
// its a namespaced resource.
if len(a.GetNamespace()) == 0 || a.GetKind().GroupKind() == api.Kind("Namespace") {
return nil
}
// we need to wait for our caches to warm
if !p.WaitForReady() {
return admission.NewForbidden(a, fmt.Errorf("not yet ready to handle request"))
}
namespace := &api.Namespace{
ObjectMeta: api.ObjectMeta{
Name: a.GetNamespace(),
func init() {
admission.RegisterPlugin("NamespaceExists", func(client clientset.Interface, config io.Reader) (admission.Interface, error) {
return NewExists(client), nil
})
}
// exists is an implementation of admission.Interface.
// It rejects all incoming requests in a namespace context if the namespace does not exist.
// It is useful in deployments that want to enforce pre-declaration of a Namespace resource.
type exists struct {
*admission.Handler
client clientset.Interface
namespaceInformer cache.SharedIndexInformer
}
var _ = admission.WantsInformerFactory(&exists{})
func (e *exists) Admit(a admission.Attributes) (err error) {
// if we're here, then we've already passed authentication, so we're allowed to do what we're trying to do
// if we're here, then the API server has found a route, which means that if we have a non-empty namespace
// its a namespaced resource.
if len(a.GetNamespace()) == 0 || a.GetKind().GroupKind() == api.Kind("Namespace") {
return nil
}
// we need to wait for our caches to warm
if !e.WaitForReady() {
return admission.NewForbidden(a, fmt.Errorf("not yet ready to handle request"))
}
namespace := &api.Namespace{
ObjectMeta: api.ObjectMeta{