rbd: replace cli with go-ceph for snapshot namespace

cephcsi uses cli for fetching snap list as well as to check the
snapshot namespace, replaced that with go-ceph calls.

Signed-off-by: Mudit Agarwal <muagarwa@redhat.com>

internal/rbd/controllerserver.go

@@ -347,7 +347,7 @@ func flattenParentImage(ctx context.Context, rbdVol *rbdVolume, cr *util.Credent
 // If the snapshots are more than the `maxSnapshotsOnImage` Add a task to
 // flatten all the temporary cloned images.
 func flattenTemporaryClonedImages(ctx context.Context, rbdVol *rbdVolume, cr *util.Credentials) error {
-	snaps, err := rbdVol.listSnapshots(ctx, cr)
+	snaps, err := rbdVol.listSnapshots()
 	if err != nil {
 		if errors.Is(err, ErrImageNotFound) {
 			return status.Error(codes.InvalidArgument, err.Error())
@@ -356,7 +356,13 @@ func flattenTemporaryClonedImages(ctx context.Context, rbdVol *rbdVolume, cr *ut
 	}
 
 	if len(snaps) > int(maxSnapshotsOnImage) {
-		err = flattenClonedRbdImages(ctx, snaps, rbdVol.Pool, rbdVol.Monitors, cr)
+		err = flattenClonedRbdImages(
+			ctx,
+			snaps,
+			rbdVol.Pool,
+			rbdVol.Monitors,
+			rbdVol.RbdImageName,
+			cr)
 		if err != nil {
 			return status.Error(codes.Internal, err.Error())
 		}

internal/rbd/rbd_util.go

@@ -417,10 +417,15 @@ func (rv *rbdVolume) getCloneDepth(ctx context.Context) (uint, error) {
 	}
 }
 
-func flattenClonedRbdImages(ctx context.Context, snaps []snapshotInfo, pool, monitors string, cr *util.Credentials) error {
+type trashSnapInfo struct {
+	origSnapName string
+}
+
+func flattenClonedRbdImages(ctx context.Context, snaps []librbd.SnapInfo, pool, monitors, rbdImageName string, cr *util.Credentials) error {
 	rv := &rbdVolume{
-		Monitors: monitors,
-		Pool:     pool,
+		Monitors:     monitors,
+		Pool:         pool,
+		RbdImageName: rbdImageName,
 	}
 	defer rv.Destroy()
 	err := rv.Connect(cr)
@@ -428,14 +433,30 @@ func flattenClonedRbdImages(ctx context.Context, snaps []snapshotInfo, pool, mon
 		util.ErrorLog(ctx, "failed to open connection %s; err %v", rv, err)
 		return err
 	}
-	for _, s := range snaps {
-		if s.Namespace.Type == "trash" {
-			rv.RbdImageName = s.Namespace.OriginalName
-			err = rv.flattenRbdImage(ctx, cr, true, rbdHardMaxCloneDepth, rbdSoftMaxCloneDepth)
-			if err != nil {
-				util.ErrorLog(ctx, "failed to flatten %s; err %v", rv, err)
-				continue
+	var origNameList []trashSnapInfo
+	for _, snapInfo := range snaps {
+		// check if the snapshot belongs to trash namespace.
+		isTrash, retErr := rv.isTrashSnap(snapInfo.Id)
+		if retErr != nil {
+			return retErr
+		}
+
+		if isTrash {
+			// get original snap name for the snapshot in trash namespace
+			origSnapName, retErr := rv.getOrigSnapName(snapInfo.Id)
+			if retErr != nil {
+				return retErr
 			}
+			origNameList = append(origNameList, trashSnapInfo{origSnapName})
+		}
+	}
+
+	for _, snapName := range origNameList {
+		rv.RbdImageName = snapName.origSnapName
+		err = rv.flattenRbdImage(ctx, cr, true, rbdHardMaxCloneDepth, rbdSoftMaxCloneDepth)
+		if err != nil {
+			util.ErrorLog(ctx, "failed to flatten %s; err %v", rv, err)
+			continue
 		}
 	}
 	return nil
@@ -1129,47 +1150,53 @@ func (rv *rbdVolume) ensureEncryptionMetadataSet(status string) error {
 	return nil
 }
 
-// SnapshotInfo holds snapshots details.
-type snapshotInfo struct {
-	ID        int    `json:"id"`
-	Name      string `json:"name"`
-	Size      int64  `json:"size"`
-	Protected string `json:"protected"`
-	Timestamp string `json:"timestamp"`
-	Namespace struct {
-		Type         string `json:"type"`
-		OriginalName string `json:"original_name"`
-	} `json:"namespace"`
+func (rv *rbdVolume) listSnapshots() ([]librbd.SnapInfo, error) {
+	image, err := rv.open()
+	if err != nil {
+		return nil, err
+	}
+	defer image.Close()
+
+	snapInfoList, err := image.GetSnapshotNames()
+	if err != nil {
+		return nil, err
+	}
+	return snapInfoList, nil
 }
 
-// TODO: use go-ceph once https://github.com/ceph/go-ceph/issues/300 is available in a release.
-func (rv *rbdVolume) listSnapshots(ctx context.Context, cr *util.Credentials) ([]snapshotInfo, error) {
-	// rbd snap ls <image> --pool=<pool-name> --all --format=json
-	var snapInfo []snapshotInfo
-	stdout, stderr, err := util.ExecCommand(
-		ctx,
-		"rbd",
-		"-m", rv.Monitors,
-		"--id", cr.ID,
-		"--keyfile="+cr.KeyFile,
-		"-c", util.CephConfigPath,
-		"--format="+"json",
-		"snap",
-		"ls",
-		"--all", rv.String())
+// isTrashSnap returns true if the snapshot belongs to trash namespace.
+func (rv *rbdVolume) isTrashSnap(snapID uint64) (bool, error) {
+	image, err := rv.open()
 	if err != nil {
-		util.ErrorLog(ctx, "failed getting information for image (%s): (%s)", rv, err)
-		if strings.Contains(stderr, "rbd: error opening image "+rv.RbdImageName+
-			": (2) No such file or directory") {
-			return snapInfo, util.JoinErrors(ErrImageNotFound, err)
-		}
-		return snapInfo, err
+		return false, err
+	}
+	defer image.Close()
+
+	// Get namespace type for the snapshot
+	nsType, err := image.GetSnapNamespaceType(snapID)
+	if err != nil {
+		return false, err
 	}
 
-	err = json.Unmarshal([]byte(stdout), &snapInfo)
-	if err != nil {
-		util.ErrorLog(ctx, "failed to parse JSON output of snapshot info (%s)", err)
-		return snapInfo, fmt.Errorf("unmarshal failed: %w. raw buffer response: %s", err, stdout)
+	if nsType == librbd.SnapNamespaceTypeTrash {
+		return true, nil
 	}
-	return snapInfo, nil
+	return false, nil
+}
+
+// getOrigSnapName returns the original snap name for
+// the snapshots in Trash Namespace.
+func (rv *rbdVolume) getOrigSnapName(snapID uint64) (string, error) {
+	image, err := rv.open()
+	if err != nil {
+		return "", err
+	}
+	defer image.Close()
+
+	origSnapName, err := image.GetSnapTrashNamespace(snapID)
+	if err != nil {
+		return "", err
+	}
+
+	return origSnapName, nil
 }