forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
admission.go
131 lines (111 loc) · 3.68 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
120
121
122
123
124
125
126
127
128
129
130
131
/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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 label
import (
"fmt"
"io"
"sync"
"k8s.io/kubernetes/pkg/admission"
"k8s.io/kubernetes/pkg/api"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/cloudprovider"
"k8s.io/kubernetes/pkg/cloudprovider/providers/aws"
)
func init() {
admission.RegisterPlugin("PersistentVolumeLabel", func(client client.Interface, config io.Reader) (admission.Interface, error) {
persistentVolumeLabelAdmission := NewPersistentVolumeLabel()
return persistentVolumeLabelAdmission, nil
})
}
var _ = admission.Interface(&persistentVolumeLabel{})
type persistentVolumeLabel struct {
*admission.Handler
mutex sync.Mutex
ebsVolumes aws.Volumes
}
// NewPersistentVolumeLabel returns an admission.Interface implementation which adds labels to PersistentVolume CREATE requests,
// based on the labels provided by the underlying cloud provider.
//
// As a side effect, the cloud provider may block invalid or non-existent volumes.
func NewPersistentVolumeLabel() *persistentVolumeLabel {
return &persistentVolumeLabel{
Handler: admission.NewHandler(admission.Create),
}
}
func (l *persistentVolumeLabel) Admit(a admission.Attributes) (err error) {
if a.GetResource() != api.Resource("persistentvolumes") {
return nil
}
obj := a.GetObject()
if obj == nil {
return nil
}
volume, ok := obj.(*api.PersistentVolume)
if !ok {
return nil
}
var volumeLabels map[string]string
if volume.Spec.AWSElasticBlockStore != nil {
labels, err := l.findAWSEBSLabels(volume)
if err != nil {
return admission.NewForbidden(a, fmt.Errorf("error querying AWS EBS volume %s: %v", volume.Spec.AWSElasticBlockStore.VolumeID, err))
}
volumeLabels = labels
}
if len(volumeLabels) != 0 {
if volume.Labels == nil {
volume.Labels = make(map[string]string)
}
for k, v := range volumeLabels {
// We (silently) replace labels if they are provided.
// This should be OK because they are in the kubernetes.io namespace
// i.e. we own them
volume.Labels[k] = v
}
}
return nil
}
func (l *persistentVolumeLabel) findAWSEBSLabels(volume *api.PersistentVolume) (map[string]string, error) {
ebsVolumes, err := l.getEBSVolumes()
if err != nil {
return nil, err
}
if ebsVolumes == nil {
return nil, fmt.Errorf("unable to build AWS cloud provider for EBS")
}
// TODO: GetVolumeLabels is actually a method on the Volumes interface
// If that gets standardized we can refactor to reduce code duplication
labels, err := ebsVolumes.GetVolumeLabels(volume.Spec.AWSElasticBlockStore.VolumeID)
if err != nil {
return nil, err
}
return labels, err
}
// getEBSVolumes returns the AWS Volumes interface for ebs
func (l *persistentVolumeLabel) getEBSVolumes() (aws.Volumes, error) {
l.mutex.Lock()
defer l.mutex.Unlock()
if l.ebsVolumes == nil {
cloudProvider, err := cloudprovider.GetCloudProvider("aws", nil)
if err != nil || cloudProvider == nil {
return nil, err
}
awsCloudProvider, ok := cloudProvider.(*aws.AWSCloud)
if !ok {
// GetCloudProvider has gone very wrong
return nil, fmt.Errorf("error retrieving AWS cloud provider")
}
l.ebsVolumes = awsCloudProvider
}
return l.ebsVolumes, nil
}