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https://github.com/optim-enterprises-bv/kubernetes.git
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108 lines
3.3 KiB
Go
108 lines
3.3 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/cache"
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"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
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"k8s.io/kubernetes/pkg/controller/informers"
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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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admission.RegisterPlugin("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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namespaceInformer cache.SharedIndexInformer
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}
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var _ = kubeapiserveradmission.WantsInformerFactory(&provision{})
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var _ = kubeapiserveradmission.WantsInformerFactory(&provision{})
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func (p *provision) 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 !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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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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_, exists, err := p.namespaceInformer.GetStore().Get(namespace)
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if err != nil {
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return admission.NewForbidden(a, 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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_, 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) SetInternalClientSet(client internalclientset.Interface) {
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p.client = client
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}
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func (p *provision) SetInformerFactory(f informers.SharedInformerFactory) {
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p.namespaceInformer = f.InternalNamespaces().Informer()
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p.SetReadyFunc(p.namespaceInformer.HasSynced)
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}
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func (p *provision) Validate() error {
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if p.namespaceInformer == nil {
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return fmt.Errorf("missing namespaceInformer")
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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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