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admission.go
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admission.go
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/*
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"
clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
"k8s.io/kubernetes/pkg/admission"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/cloudprovider"
"k8s.io/kubernetes/pkg/cloudprovider/providers/aws"
"k8s.io/kubernetes/pkg/cloudprovider/providers/gce"
vol "k8s.io/kubernetes/pkg/volume"
)
func init() {
admission.RegisterPlugin("PersistentVolumeLabel", func(client clientset.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
gceCloudProvider *gce.GCECloud
}
// 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().GroupResource() != 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 volume.Spec.GCEPersistentDisk != nil {
labels, err := l.findGCEPDLabels(volume)
if err != nil {
return admission.NewForbidden(a, fmt.Errorf("error querying GCE PD volume %s: %v", volume.Spec.GCEPersistentDisk.PDName, 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) {
// Ignore any volumes that are being provisioned
if volume.Spec.AWSElasticBlockStore.VolumeID == vol.ProvisionedVolumeName {
return nil, nil
}
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
}
func (l *persistentVolumeLabel) findGCEPDLabels(volume *api.PersistentVolume) (map[string]string, error) {
// Ignore any volumes that are being provisioned
if volume.Spec.GCEPersistentDisk.PDName == vol.ProvisionedVolumeName {
return nil, nil
}
provider, err := l.getGCECloudProvider()
if err != nil {
return nil, err
}
if provider == nil {
return nil, fmt.Errorf("unable to build GCE cloud provider for PD")
}
labels, err := provider.GetAutoLabelsForPD(volume.Spec.GCEPersistentDisk.PDName)
if err != nil {
return nil, err
}
return labels, err
}
// getGCECloudProvider returns the GCE cloud provider, for use for querying volume labels
func (l *persistentVolumeLabel) getGCECloudProvider() (*gce.GCECloud, error) {
l.mutex.Lock()
defer l.mutex.Unlock()
if l.gceCloudProvider == nil {
cloudProvider, err := cloudprovider.GetCloudProvider("gce", nil)
if err != nil || cloudProvider == nil {
return nil, err
}
gceCloudProvider, ok := cloudProvider.(*gce.GCECloud)
if !ok {
// GetCloudProvider has gone very wrong
return nil, fmt.Errorf("error retrieving GCE cloud provider")
}
l.gceCloudProvider = gceCloudProvider
}
return l.gceCloudProvider, nil
}