108 lines
3.1 KiB
Go
108 lines
3.1 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package exists
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import (
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"io"
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"k8s.io/kubernetes/pkg/client/cache"
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clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
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"fmt"
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"k8s.io/kubernetes/pkg/admission"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/errors"
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"k8s.io/kubernetes/pkg/controller/informers"
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)
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func init() {
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admission.RegisterPlugin("NamespaceExists", func(client clientset.Interface, config io.Reader) (admission.Interface, error) {
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return NewExists(client), nil
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})
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}
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// exists is an implementation of admission.Interface.
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// It rejects all incoming requests in a namespace context if the namespace does not exist.
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// It is useful in deployments that want to enforce pre-declaration of a Namespace resource.
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type exists struct {
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*admission.Handler
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client clientset.Interface
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namespaceInformer cache.SharedIndexInformer
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}
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var _ = admission.WantsInformerFactory(&exists{})
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func (e *exists) Admit(a admission.Attributes) (err error) {
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// if we're here, then we've already passed authentication, so we're allowed to do what we're trying to do
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// if we're here, then the API server has found a route, which means that if we have a non-empty namespace
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// its a namespaced resource.
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if len(a.GetNamespace()) == 0 || a.GetKind().GroupKind() == api.Kind("Namespace") {
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return nil
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}
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// we need to wait for our caches to warm
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if !e.WaitForReady() {
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return admission.NewForbidden(a, fmt.Errorf("not yet ready to handle request"))
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}
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namespace := &api.Namespace{
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ObjectMeta: api.ObjectMeta{
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Name: a.GetNamespace(),
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Namespace: "",
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},
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Status: api.NamespaceStatus{},
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}
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_, exists, err := e.namespaceInformer.GetStore().Get(namespace)
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if err != nil {
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return errors.NewInternalError(err)
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}
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if exists {
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return nil
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}
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// in case of latency in our caches, make a call direct to storage to verify that it truly exists or not
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_, err = e.client.Core().Namespaces().Get(a.GetNamespace())
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if err != nil {
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if errors.IsNotFound(err) {
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return err
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}
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return errors.NewInternalError(err)
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}
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return nil
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}
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// NewExists creates a new namespace exists admission control handler
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func NewExists(c clientset.Interface) admission.Interface {
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return &exists{
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client: c,
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Handler: admission.NewHandler(admission.Create, admission.Update, admission.Delete),
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}
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}
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func (e *exists) SetInformerFactory(f informers.SharedInformerFactory) {
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e.namespaceInformer = f.Namespaces().Informer()
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e.SetReadyFunc(e.namespaceInformer.HasSynced)
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}
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func (e *exists) Validate() error {
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if e.namespaceInformer == nil {
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return fmt.Errorf("missing namespaceInformer")
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}
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return nil
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}
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