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3f8d6e9210
this is a two stage refactor when done there will be no init block in admission plugins. Instead all plugins expose Register function which accept admission.Plugins instance. The registration to global plugin registry happens inside Register func.
119 lines
3.6 KiB
Go
119 lines
3.6 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 autoprovision
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import (
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"fmt"
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"io"
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"k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apiserver/pkg/admission"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
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informers "k8s.io/kubernetes/pkg/client/informers/informers_generated/internalversion"
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corelisters "k8s.io/kubernetes/pkg/client/listers/core/internalversion"
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kubeapiserveradmission "k8s.io/kubernetes/pkg/kubeapiserver/admission"
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)
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func init() {
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Register(&kubeapiserveradmission.Plugins)
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}
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// Register registers a plugin
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func Register(plugins *admission.Plugins) {
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plugins.Register("NamespaceAutoProvision", func(config io.Reader) (admission.Interface, error) {
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return NewProvision(), nil
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})
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}
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// provision is an implementation of admission.Interface.
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// It looks at all incoming requests in a namespace context, and if the namespace does not exist, it creates one.
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// It is useful in deployments that do not want to restrict creation of a namespace prior to its usage.
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type provision struct {
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*admission.Handler
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client internalclientset.Interface
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namespaceLister corelisters.NamespaceLister
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}
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var _ = kubeapiserveradmission.WantsInternalKubeInformerFactory(&provision{})
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var _ = kubeapiserveradmission.WantsInternalKubeClientSet(&provision{})
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func (p *provision) Admit(a admission.Attributes) 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 !p.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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_, err := p.namespaceLister.Get(a.GetNamespace())
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if err == nil {
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return nil
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}
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if !errors.IsNotFound(err) {
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return admission.NewForbidden(a, err)
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}
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namespace := &api.Namespace{
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ObjectMeta: metav1.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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_, err = p.client.Core().Namespaces().Create(namespace)
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if err != nil && !errors.IsAlreadyExists(err) {
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return admission.NewForbidden(a, err)
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}
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return nil
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}
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// NewProvision creates a new namespace provision admission control handler
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func NewProvision() admission.Interface {
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return &provision{
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Handler: admission.NewHandler(admission.Create),
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}
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}
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func (p *provision) SetInternalKubeClientSet(client internalclientset.Interface) {
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p.client = client
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}
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func (p *provision) SetInternalKubeInformerFactory(f informers.SharedInformerFactory) {
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namespaceInformer := f.Core().InternalVersion().Namespaces()
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p.namespaceLister = namespaceInformer.Lister()
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p.SetReadyFunc(namespaceInformer.Informer().HasSynced)
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}
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func (p *provision) Validate() error {
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if p.namespaceLister == nil {
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return fmt.Errorf("missing namespaceLister")
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}
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if p.client == nil {
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return fmt.Errorf("missing client")
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}
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return nil
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}
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