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longhorn.go
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longhorn.go
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package longhorn
import (
"fmt"
"os"
"path/filepath"
"strconv"
"sync"
"time"
"github.com/Sirupsen/logrus"
"github.com/rancher/convoy/convoydriver"
"github.com/rancher/convoy/util"
"github.com/rancher/go-rancher-metadata/metadata"
rancherClient "github.com/rancher/go-rancher/client"
)
const (
DRIVER_NAME = "longhorn"
DRIVER_CONFIG_FILE = "longhorn.cfg"
MOUNTS_DIR = "mounts"
DEV_DIR = "/dev/longhorn/%s"
VOLUME_CFG_PREFIX = "volume_"
LONGHORN_CFG_PREFIX = DRIVER_NAME + "_"
CFG_POSTFIX = ".json"
SNAPSHOT_PATH = "snapshots"
DEFAULT_VOLUME_SIZE = "10G"
RANCHER_METADATA_URL = "http://rancher-metadata/2015-12-19"
LH_RANCHER_URL = "lh.rancherurl"
LH_RANCHER_ACCESS_KEY = "lh.rancheraccesskey"
LH_RANCHER_SECRET_KEY = "lh.ranchersecretkey"
LH_DEFAULT_VOLUME_SIZE = "lh.defaultvolumesize"
LH_CONTAINER_NAME = "lh.containername"
COMPOSE_VOLUME_NAME = "VOLUME_NAME"
COMPOSE_VOLUME_SIZE = "VOLUME_SIZE"
COMPOSE_SLAB_SIZE = "SLAB_SIZE"
COMPOSE_CONVOY = "CONVOY_CONTAINER"
AFFINITY_LABEL = "io.rancher.scheduler.affinity:container"
)
var (
log = logrus.WithFields(logrus.Fields{"pkg": "longhorn"})
)
type Driver struct {
mutex *sync.RWMutex
client *rancherClient.RancherClient
containerName string
Device
}
type Device struct {
Root string
DefaultVolumeSize int64
RancherURL string
RancherAccessKey string
RancherSecretKey string
}
func (dev *Device) ConfigFile() (string, error) {
if dev.Root == "" {
return "", fmt.Errorf("BUG: Invalid empty device config path")
}
return filepath.Join(dev.Root, DRIVER_CONFIG_FILE), nil
}
type Volume struct {
UUID string
Size int64
Name string
MountPoint string
PrepareForVM bool
configPath string
}
func (v *Volume) Stack(driver *Driver) *Stack {
sizeString := strconv.FormatInt(v.Size, 10)
env := map[string]interface{}{
COMPOSE_SLAB_SIZE: sizeString,
COMPOSE_VOLUME_NAME: v.Name,
COMPOSE_VOLUME_SIZE: sizeString,
COMPOSE_CONVOY: driver.containerName,
}
return &Stack{
Client: driver.client,
Name: "longhorn-vol-" + v.Name,
ExternalId: "system://longhorn?name=" + v.Name,
Template: DockerComposeTemplate,
Environment: env,
ContainerName: driver.containerName,
}
}
func (v *Volume) ConfigFile() (string, error) {
if v.UUID == "" {
return "", fmt.Errorf("BUG: Invalid empty volume UUID")
}
if v.configPath == "" {
return "", fmt.Errorf("BUG: Invalid empty volume config path")
}
return filepath.Join(v.configPath, LONGHORN_CFG_PREFIX+VOLUME_CFG_PREFIX+v.UUID+CFG_POSTFIX), nil
}
func (v *Volume) GetDevice() (string, error) {
return fmt.Sprintf(DEV_DIR, v.Name), nil
}
func (v *Volume) GetMountOpts() []string {
return []string{}
}
func (v *Volume) GenerateDefaultMountPoint() string {
return filepath.Join(v.configPath, MOUNTS_DIR, v.Name)
}
func (d *Driver) blankVolume(id string) *Volume {
return &Volume{
configPath: d.Root,
UUID: id,
}
}
func init() {
convoydriver.Register(DRIVER_NAME, Init)
}
func override(existing, newValue string) string {
if newValue != "" {
return newValue
}
return existing
}
func Init(root string, config map[string]string) (convoydriver.ConvoyDriver, error) {
dev := &Device{
Root: root,
}
exists, err := util.ObjectExists(dev)
if err != nil {
return nil, err
}
if exists {
if err := util.ObjectLoad(dev); err != nil {
return nil, err
}
dev.RancherURL = override(dev.RancherURL, config[LH_RANCHER_URL])
dev.RancherAccessKey = override(dev.RancherAccessKey, config[LH_RANCHER_ACCESS_KEY])
dev.RancherSecretKey = override(dev.RancherSecretKey, config[LH_RANCHER_SECRET_KEY])
} else {
if err := util.MkdirIfNotExists(root); err != nil {
return nil, err
}
url := config[LH_RANCHER_URL]
accessKey := config[LH_RANCHER_ACCESS_KEY]
secretKey := config[LH_RANCHER_SECRET_KEY]
if url == "" || accessKey == "" || secretKey == "" {
return nil, fmt.Errorf("Missing required parameter. lh.rancherurl or lh.rancheraccesskey or lh.ranchersecretkey")
}
if _, exists := config[LH_DEFAULT_VOLUME_SIZE]; !exists {
config[LH_DEFAULT_VOLUME_SIZE] = DEFAULT_VOLUME_SIZE
}
volumeSize, err := util.ParseSize(config[LH_DEFAULT_VOLUME_SIZE])
if err != nil || volumeSize == 0 {
return nil, fmt.Errorf("Illegal default volume size specified")
}
dev = &Device{
Root: root,
RancherURL: url,
RancherAccessKey: accessKey,
RancherSecretKey: secretKey,
DefaultVolumeSize: volumeSize,
}
}
containerName := config[LH_CONTAINER_NAME]
if containerName == "" {
handler := metadata.NewClient(RANCHER_METADATA_URL)
container, err := handler.GetSelfContainer()
if err != nil {
return nil, err
}
containerName = container.UUID
}
log.Debugf("Try to connect to Rancher server at %s [%s:%s]", dev.RancherURL, dev.RancherAccessKey, dev.RancherSecretKey)
client, err := rancherClient.NewRancherClient(&rancherClient.ClientOpts{
Url: dev.RancherURL,
AccessKey: dev.RancherAccessKey,
SecretKey: dev.RancherSecretKey,
})
if err != nil {
return nil, fmt.Errorf("Failed to establish connection to Rancher server")
}
if err := util.ObjectSave(dev); err != nil {
return nil, err
}
d := &Driver{
client: client,
containerName: containerName,
Device: *dev,
}
return d, nil
}
func (d *Driver) Name() string {
return DRIVER_NAME
}
func (d *Driver) Info() (map[string]string, error) {
return map[string]string{
"Root": d.Root,
"RancherURL": d.RancherURL,
"RancherAccessKey": d.RancherAccessKey,
"RancherSecretKey": d.RancherSecretKey,
}, nil
}
func (d *Driver) VolumeOps() (convoydriver.VolumeOperations, error) {
return d, nil
}
func (d *Driver) CreateVolume(id string, opts map[string]string) error {
size, err := util.ParseSize(opts[convoydriver.OPT_SIZE])
if err != nil {
return err
}
if size == 0 {
size = d.DefaultVolumeSize
}
volume := d.blankVolume(id)
volume.Size = size
volume.Name = opts["VolumeName"]
volume.PrepareForVM, err = strconv.ParseBool(opts[convoydriver.OPT_PREPARE_FOR_VM])
if err != nil {
return err
}
stack := volume.Stack(d)
if err := d.doCreateVolume(volume, stack, id, opts); err != nil {
stack.Delete()
return err
}
return nil
}
func (d *Driver) doCreateVolume(volume *Volume, stack *Stack, id string, opts map[string]string) error {
// Doing find just to see if we are creating versus using an existing stack
env, err := stack.Find()
if err != nil {
return err
}
// Always run create because it also ensures that things are active
if _, err := stack.Create(); err != nil {
return err
}
// If env was nil then we created stack so we need to format
if env == nil {
dev, _ := volume.GetDevice()
err := Backoff(5*time.Minute, fmt.Sprintf("Failed to find %s", dev), func() (bool, error) {
if _, err := os.Stat(dev); err == nil {
return true, nil
}
return false, nil
})
if err != nil {
return err
}
log.Infof("Formatting %s", dev)
if _, err := util.Execute("mkfs.ext4", []string{dev}); err != nil {
return err
}
}
return util.ObjectSave(volume)
}
func (d *Driver) DeleteVolume(id string, opts map[string]string) error {
volume := d.blankVolume(id)
if err := util.ObjectLoad(volume); err != nil {
return err
}
if volume.MountPoint != "" {
return fmt.Errorf("Cannot delete volume %v. It is still mounted", id)
}
referenceOnly, _ := strconv.ParseBool(opts[convoydriver.OPT_REFERENCE_ONLY])
if !referenceOnly {
log.Debugf("Deleting stack for volume %v", id)
if err := volume.Stack(d).Delete(); err != nil {
return err
}
}
return util.ObjectDelete(volume)
}
func (d *Driver) MountVolume(id string, opts map[string]string) (string, error) {
volume := d.blankVolume(id)
if err := util.ObjectLoad(volume); err != nil {
return "", err
}
if err := volume.Stack(d).MoveController(); err != nil {
log.Errorf("Failed to move controller to %s", d.containerName)
return "", err
}
mountPoint, err := util.VolumeMount(volume, opts[convoydriver.OPT_MOUNT_POINT], false)
if err != nil {
return "", err
}
if volume.PrepareForVM {
if err := util.MountPointPrepareImageFile(mountPoint, volume.Size); err != nil {
return "", err
}
}
if err := util.ObjectSave(volume); err != nil {
return "", err
}
return mountPoint, nil
}
func (d *Driver) UmountVolume(id string) error {
volume := d.blankVolume(id)
if err := util.ObjectLoad(volume); err != nil {
return err
}
if err := util.VolumeUmount(volume); err != nil {
return err
}
return util.ObjectSave(volume)
}
func (d *Driver) MountPoint(id string) (string, error) {
volume := d.blankVolume(id)
if err := util.ObjectLoad(volume); err != nil {
return "", err
}
return volume.MountPoint, nil
}
func (d *Driver) GetVolumeInfo(id string) (map[string]string, error) {
volume := d.blankVolume(id)
if err := util.ObjectLoad(volume); err != nil {
return nil, err
}
return map[string]string{
"Size": strconv.FormatInt(volume.Size, 10),
convoydriver.OPT_PREPARE_FOR_VM: strconv.FormatBool(volume.PrepareForVM),
}, nil
}
func (d *Driver) ListVolume(opts map[string]string) (map[string]map[string]string, error) {
d.mutex.RLock()
defer d.mutex.RUnlock()
volumeIDs, err := d.listVolumeIDs()
if err != nil {
return nil, err
}
result := map[string]map[string]string{}
for _, id := range volumeIDs {
result[id], err = d.GetVolumeInfo(id)
if err != nil {
return nil, err
}
}
return result, nil
}
func (device *Device) listVolumeIDs() ([]string, error) {
return util.ListConfigIDs(device.Root, LONGHORN_CFG_PREFIX+VOLUME_CFG_PREFIX, CFG_POSTFIX)
}
func (d *Driver) SnapshotOps() (convoydriver.SnapshotOperations, error) {
return nil, fmt.Errorf("Longhorn doesn't support snapshot ops")
}
func (d *Driver) BackupOps() (convoydriver.BackupOperations, error) {
return nil, fmt.Errorf("Longhorn doesn't support backup ops")
}