VolumeSnapshot (#787)

Tasks:
- [x] Create VolumeSnapshot
- [x] Restore VolumeSnapshot

Author: suaas21

create_volumesnapshot.go

@@ -0,0 +1,219 @@
+package cmds
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/appscode/go/log"
+	vs "github.com/kubernetes-csi/external-snapshotter/pkg/apis/volumesnapshot/v1alpha1"
+	vs_cs "github.com/kubernetes-csi/external-snapshotter/pkg/client/clientset/versioned"
+	"github.com/spf13/cobra"
+	appsv1 "k8s.io/api/apps/v1"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/tools/clientcmd"
+	"kmodules.xyz/client-go/meta"
+	"stash.appscode.dev/stash/apis"
+	"stash.appscode.dev/stash/apis/stash/v1beta1"
+	cs "stash.appscode.dev/stash/client/clientset/versioned"
+	"stash.appscode.dev/stash/pkg/restic"
+	"stash.appscode.dev/stash/pkg/status"
+	"stash.appscode.dev/stash/pkg/util"
+)
+
+type VSoption struct {
+	name           string
+	namespace      string
+	kubeClient     kubernetes.Interface
+	stashClient    cs.Interface
+	snapshotClient vs_cs.Interface
+}
+
+func NewCmdCreateVolumeSnapshot() *cobra.Command {
+	var (
+		masterURL      string
+		kubeconfigPath string
+		opt            = VSoption{
+			namespace: meta.Namespace(),
+		}
+	)
+
+	cmd := &cobra.Command{
+		Use:               "create-vs",
+		Short:             "Take snapshot of PersistentVolumeClaims",
+		DisableAutoGenTag: true,
+		Run: func(cmd *cobra.Command, args []string) {
+			config, err := clientcmd.BuildConfigFromFlags(masterURL, kubeconfigPath)
+			if err != nil {
+				log.Fatalf("Could not get Kubernetes config: %s", err)
+			}
+			opt.kubeClient = kubernetes.NewForConfigOrDie(config)
+			opt.stashClient = cs.NewForConfigOrDie(config)
+			opt.snapshotClient = vs_cs.NewForConfigOrDie(config)
+
+			err = opt.CreateVolumeSnapshot()
+			if err != nil {
+				log.Fatal(err)
+			}
+		},
+	}
+	cmd.Flags().StringVar(&masterURL, "master", "", "The address of the Kubernetes API server (overrides any value in kubeconfig)")
+	cmd.Flags().StringVar(&kubeconfigPath, "kubeconfig", "", "Path to kubeconfig file with authorization information (the master location is set by the master flag).")
+	cmd.Flags().StringVar(&opt.name, "backupsession.name", "", "Set BackupSession Name")
+	return cmd
+}
+
+func (opt *VSoption) CreateVolumeSnapshot() error {
+	// Start clock to measure total session duration
+	startTime := time.Now()
+	backupSession, err := opt.stashClient.StashV1beta1().BackupSessions(opt.namespace).Get(opt.name, metav1.GetOptions{})
+	if err != nil {
+		return err
+	}
+	backupConfiguration, err := opt.stashClient.StashV1beta1().BackupConfigurations(opt.namespace).Get(backupSession.Spec.BackupConfiguration.Name, metav1.GetOptions{})
+	if err != nil {
+		return err
+	}
+	if backupConfiguration == nil {
+		return fmt.Errorf("BackupConfiguration is nil")
+	}
+	if backupConfiguration.Spec.Target == nil {
+		return fmt.Errorf("backupConfiguration target is nil")
+	}
+
+	kind := backupConfiguration.Spec.Target.Ref.Kind
+	name := backupConfiguration.Spec.Target.Ref.Name
+	namespace := backupConfiguration.Namespace
+
+	var (
+		pvcList []string
+	)
+
+	switch kind {
+	case apis.KindDeployment:
+		deployment, err := opt.kubeClient.AppsV1().Deployments(namespace).Get(name, metav1.GetOptions{})
+		if err != nil {
+			return err
+		}
+		pvcList = getPVCs(deployment.Spec.Template.Spec.Volumes)
+
+	case apis.KindDaemonSet:
+		daemon, err := opt.kubeClient.AppsV1().DaemonSets(namespace).Get(name, metav1.GetOptions{})
+		if err != nil {
+			return err
+		}
+		pvcList = getPVCs(daemon.Spec.Template.Spec.Volumes)
+
+	case apis.KindReplicationController:
+		rc, err := opt.kubeClient.CoreV1().ReplicationControllers(namespace).Get(name, metav1.GetOptions{})
+		if err != nil {
+			return err
+		}
+		pvcList = getPVCs(rc.Spec.Template.Spec.Volumes)
+
+	case apis.KindReplicaSet:
+		rs, err := opt.kubeClient.AppsV1().ReplicaSets(namespace).Get(name, metav1.GetOptions{})
+		if err != nil {
+			return err
+		}
+		pvcList = getPVCs(rs.Spec.Template.Spec.Volumes)
+
+	case apis.KindStatefulSet:
+		ss, err := opt.kubeClient.AppsV1().StatefulSets(namespace).Get(name, metav1.GetOptions{})
+		if err != nil {
+			return err
+		}
+		pvcList = getPVCsForStatefulset(ss.Spec.VolumeClaimTemplates, ss, backupConfiguration.Spec.Target.Replicas)
+
+	case apis.KindPersistentVolumeClaim:
+		pvcList = []string{name}
+	}
+
+	objectMeta := []metav1.ObjectMeta{}
+
+	for _, pvcName := range pvcList {
+		parts := strings.Split(backupSession.Name, "-")
+		volumeSnapshot := opt.getVolumeSnapshotDefinition(backupConfiguration, pvcName, parts[len(parts)-1])
+		vs, err := opt.snapshotClient.VolumesnapshotV1alpha1().VolumeSnapshots(namespace).Create(&volumeSnapshot)
+		if err != nil {
+			return err
+		}
+		objectMeta = append(objectMeta, vs.ObjectMeta)
+	}
+
+	for i, pvcName := range pvcList {
+		err = util.WaitUntilVolumeSnapshotReady(opt.snapshotClient, objectMeta[i])
+		if err != nil {
+			return err
+		}
+		// Update Backup Session
+		o := status.UpdateStatusOptions{
+			KubeClient:    opt.kubeClient,
+			StashClient:   opt.stashClient.(*cs.Clientset),
+			Namespace:     opt.namespace,
+			BackupSession: opt.name,
+		}
+		backupOutput := restic.BackupOutput{
+			HostBackupStats: v1beta1.HostBackupStats{
+				Hostname: pvcName,
+				Phase:    v1beta1.HostBackupSucceeded,
+			},
+		}
+		// Volume Snapshot complete. Read current time and calculate total backup duration.
+		endTime := time.Now()
+		backupOutput.HostBackupStats.Duration = endTime.Sub(startTime).String()
+
+		err = o.UpdatePostBackupStatus(&backupOutput)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (opt *VSoption) getVolumeSnapshotDefinition(backupConfiguration *v1beta1.BackupConfiguration, pvcName string, timestamp string) (volumeSnapshot vs.VolumeSnapshot) {
+	return vs.VolumeSnapshot{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      fmt.Sprintf("%s-%s", pvcName, timestamp),
+			Namespace: backupConfiguration.Namespace,
+		},
+		Spec: vs.VolumeSnapshotSpec{
+			VolumeSnapshotClassName: &backupConfiguration.Spec.Target.VolumeSnapshotClassName,
+			Source: &corev1.TypedLocalObjectReference{
+				Kind: apis.KindPersistentVolumeClaim,
+				Name: pvcName,
+			},
+		},
+	}
+
+}
+
+func getPVCs(volList []corev1.Volume) []string {
+	pvcList := make([]string, 0)
+	for _, vol := range volList {
+		if vol.PersistentVolumeClaim != nil {
+			pvcList = append(pvcList, vol.PersistentVolumeClaim.ClaimName)
+		}
+	}
+	return pvcList
+}
+
+func getPVCsForStatefulset(volList []corev1.PersistentVolumeClaim, ss *appsv1.StatefulSet, replicas *int32) []string {
+	pvcList := make([]string, 0)
+	var rep *int32
+	if replicas != nil {
+		rep = replicas
+	} else {
+		rep = ss.Spec.Replicas
+	}
+	for i := int32(0); i < *rep; i++ {
+		podName := fmt.Sprintf("%v-%v", ss.Name, i)
+		for _, vol := range volList {
+			pvcList = append(pvcList, fmt.Sprintf("%v-%v", vol.Name, podName))
+		}
+	}
+	return pvcList
+
+}