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plugin.go
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plugin.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 flocker
import (
"fmt"
"time"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/pkg/util/exec"
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/volume"
flockerclient "github.com/ClusterHQ/flocker-go"
)
const (
flockerPluginName = "kubernetes.io/flocker"
defaultHost = "localhost"
defaultPort = 4523
defaultCACertFile = "/etc/flocker/cluster.crt"
defaultClientKeyFile = "/etc/flocker/apiuser.key"
defaultClientCertFile = "/etc/flocker/apiuser.crt"
timeoutWaitingForVolume = 2 * time.Minute
tickerWaitingForVolume = 5 * time.Second
)
func ProbeVolumePlugins() []volume.VolumePlugin {
return []volume.VolumePlugin{&flockerPlugin{}}
}
type flockerPlugin struct {
host volume.VolumeHost
}
type flocker struct {
datasetName string
path string
pod *api.Pod
mounter mount.Interface
plugin *flockerPlugin
}
func (p *flockerPlugin) Init(host volume.VolumeHost) error {
p.host = host
return nil
}
func (p flockerPlugin) Name() string {
return flockerPluginName
}
func (p flockerPlugin) CanSupport(spec *volume.Spec) bool {
return (spec.PersistentVolume != nil && spec.PersistentVolume.Spec.Flocker != nil) ||
(spec.Volume != nil && spec.Volume.Flocker != nil)
}
func (p *flockerPlugin) getFlockerVolumeSource(spec *volume.Spec) (*api.FlockerVolumeSource, bool) {
// AFAIK this will always be r/w, but perhaps for the future it will be needed
readOnly := false
if spec.Volume != nil && spec.Volume.Flocker != nil {
return spec.Volume.Flocker, readOnly
}
return spec.PersistentVolume.Spec.Flocker, readOnly
}
func (p *flockerPlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, opts volume.VolumeOptions) (volume.Builder, error) {
source, readOnly := p.getFlockerVolumeSource(spec)
builder := flockerBuilder{
flocker: &flocker{
datasetName: source.DatasetName,
pod: pod,
mounter: p.host.GetMounter(),
plugin: p,
},
exe: exec.New(),
opts: opts,
readOnly: readOnly,
}
return &builder, nil
}
func (p *flockerPlugin) NewCleaner(datasetName string, podUID types.UID) (volume.Cleaner, error) {
// Flocker agent will take care of this, there is nothing we can do here
return nil, nil
}
type flockerBuilder struct {
*flocker
client flockerclient.Clientable
exe exec.Interface
opts volume.VolumeOptions
readOnly bool
volume.MetricsNil
}
func (b flockerBuilder) GetAttributes() volume.Attributes {
return volume.Attributes{
ReadOnly: b.readOnly,
Managed: false,
SupportsSELinux: false,
}
}
func (b flockerBuilder) GetPath() string {
return b.flocker.path
}
func (b flockerBuilder) SetUp(fsGroup *int64) error {
return b.SetUpAt(b.flocker.datasetName, fsGroup)
}
// newFlockerClient uses environment variables and pod attributes to return a
// flocker client capable of talking with the Flocker control service.
func (b flockerBuilder) newFlockerClient() (*flockerclient.Client, error) {
host := util.GetEnvAsStringOrFallback("FLOCKER_CONTROL_SERVICE_HOST", defaultHost)
port, err := util.GetEnvAsIntOrFallback("FLOCKER_CONTROL_SERVICE_PORT", defaultPort)
if err != nil {
return nil, err
}
caCertPath := util.GetEnvAsStringOrFallback("FLOCKER_CONTROL_SERVICE_CA_FILE", defaultCACertFile)
keyPath := util.GetEnvAsStringOrFallback("FLOCKER_CONTROL_SERVICE_CLIENT_KEY_FILE", defaultClientKeyFile)
certPath := util.GetEnvAsStringOrFallback("FLOCKER_CONTROL_SERVICE_CLIENT_CERT_FILE", defaultClientCertFile)
c, err := flockerclient.NewClient(host, port, b.flocker.pod.Status.HostIP, caCertPath, keyPath, certPath)
return c, err
}
/*
SetUpAt will setup a Flocker volume following this flow of calls to the Flocker
control service:
1. Get the dataset id for the given volume name/dir
2. It should already be there, if it's not the user needs to manually create it
3. Check the current Primary UUID
4. If it doesn't match with the Primary UUID that we got on 2, then we will
need to update the Primary UUID for this volume.
5. Wait until the Primary UUID was updated or timeout.
*/
func (b flockerBuilder) SetUpAt(dir string, fsGroup *int64) error {
if b.client == nil {
c, err := b.newFlockerClient()
if err != nil {
return err
}
b.client = c
}
datasetID, err := b.client.GetDatasetID(dir)
if err != nil {
return err
}
s, err := b.client.GetDatasetState(datasetID)
if err != nil {
return fmt.Errorf("The volume '%s' is not available in Flocker. You need to create this manually with Flocker CLI before using it.", dir)
}
primaryUUID, err := b.client.GetPrimaryUUID()
if err != nil {
return err
}
if s.Primary != primaryUUID {
if err := b.updateDatasetPrimary(datasetID, primaryUUID); err != nil {
return err
}
newState, err := b.client.GetDatasetState(datasetID)
if err != nil {
return fmt.Errorf("The volume '%s' migrated unsuccessfully.", datasetID)
}
b.flocker.path = newState.Path
} else {
b.flocker.path = s.Path
}
return nil
}
// updateDatasetPrimary will update the primary in Flocker and wait for it to
// be ready. If it never gets to ready state it will timeout and error.
func (b flockerBuilder) updateDatasetPrimary(datasetID, primaryUUID string) error {
// We need to update the primary and wait for it to be ready
_, err := b.client.UpdatePrimaryForDataset(primaryUUID, datasetID)
if err != nil {
return err
}
timeoutChan := time.NewTimer(timeoutWaitingForVolume).C
tickChan := time.NewTicker(tickerWaitingForVolume).C
for {
if s, err := b.client.GetDatasetState(datasetID); err == nil && s.Primary == primaryUUID {
return nil
}
select {
case <-timeoutChan:
return fmt.Errorf(
"Timed out waiting for the dataset_id: '%s' to be moved to the primary: '%s'\n%v",
datasetID, primaryUUID, err,
)
case <-tickChan:
break
}
}
}