This repository has been archived by the owner on Jul 1, 2023. It is now read-only.
forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 1
/
admission.go
119 lines (100 loc) · 3.92 KB
/
admission.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package autoprovision
import (
"fmt"
"io"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apiserver/pkg/admission"
api "k8s.io/kubernetes/pkg/apis/core"
"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
informers "k8s.io/kubernetes/pkg/client/informers/informers_generated/internalversion"
corelisters "k8s.io/kubernetes/pkg/client/listers/core/internalversion"
kubeapiserveradmission "k8s.io/kubernetes/pkg/kubeapiserver/admission"
)
// Register registers a plugin
func Register(plugins *admission.Plugins) {
plugins.Register("NamespaceAutoProvision", func(config io.Reader) (admission.Interface, error) {
return NewProvision(), 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 internalclientset.Interface
namespaceLister corelisters.NamespaceLister
}
var _ admission.MutationInterface = &Provision{}
var _ = kubeapiserveradmission.WantsInternalKubeInformerFactory(&Provision{})
var _ = kubeapiserveradmission.WantsInternalKubeClientSet(&Provision{})
// Admit makes an admission decision based on the request attributes
func (p *Provision) Admit(a admission.Attributes) 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"))
}
_, err := p.namespaceLister.Get(a.GetNamespace())
if err == nil {
return nil
}
if !errors.IsNotFound(err) {
return admission.NewForbidden(a, err)
}
namespace := &api.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: a.GetNamespace(),
Namespace: "",
},
Status: api.NamespaceStatus{},
}
_, err = p.client.Core().Namespaces().Create(namespace)
if err != nil && !errors.IsAlreadyExists(err) {
return admission.NewForbidden(a, err)
}
return nil
}
// NewProvision creates a new namespace provision admission control handler
func NewProvision() *Provision {
return &Provision{
Handler: admission.NewHandler(admission.Create),
}
}
// SetInternalKubeClientSet implements the WantsInternalKubeClientSet interface.
func (p *Provision) SetInternalKubeClientSet(client internalclientset.Interface) {
p.client = client
}
// SetInternalKubeInformerFactory implements the WantsInternalKubeInformerFactory interface.
func (p *Provision) SetInternalKubeInformerFactory(f informers.SharedInformerFactory) {
namespaceInformer := f.Core().InternalVersion().Namespaces()
p.namespaceLister = namespaceInformer.Lister()
p.SetReadyFunc(namespaceInformer.Informer().HasSynced)
}
// ValidateInitialization implements the InitializationValidator interface.
func (p *Provision) ValidateInitialization() error {
if p.namespaceLister == nil {
return fmt.Errorf("missing namespaceLister")
}
if p.client == nil {
return fmt.Errorf("missing client")
}
return nil
}