Golang rbd_snap_list Examples

Example #1

File: rbd.go Project: kallax/go-ceph-1

// int rbd_snap_list(rbd_image_t image, rbd_snap_info_t *snaps, int *max_snaps);
// void rbd_snap_list_end(rbd_snap_info_t *snaps);
func (image *Image) GetSnapshotNames() (snaps []SnapInfo, err error) {
	if image.image == nil {
		return nil, RbdErrorImageNotOpen
	}

	var c_max_snaps C.int = 0

	ret := C.rbd_snap_list(image.image, nil, &c_max_snaps)

	c_snaps := make([]C.rbd_snap_info_t, c_max_snaps)
	snaps = make([]SnapInfo, c_max_snaps)

	ret = C.rbd_snap_list(image.image,
		&c_snaps[0], &c_max_snaps)
	if ret < 0 {
		return nil, RBDError(int(ret))
	}

	for i, s := range c_snaps {
		snaps[i] = SnapInfo{Id: uint64(s.id),
			Size: uint64(s.size),
			Name: C.GoString(s.name)}
	}

	C.rbd_snap_list_end(&c_snaps[0])
	return snaps[:len(snaps)-1], nil
}

Example #2

File: image.go Project: yp-engineering/librbd

// ListSnapshots yields a list of the snapshots for the given interface. max
// will yield a maximum of N items.
func (img *Image) ListSnapshots(max int) ([]string, error) {
	snapInfo := make([]C.rbd_snap_info_t, max)
	list := []string{}
	cMax := C.int(max)

	action := func(image *C.rbd_image_t) error {
		if i, err := C.rbd_snap_list(*image, &snapInfo[0], &cMax); err != nil || i < 0 {
			return strerror(i)
		}

		for i := 0; i < int(cMax); i++ {
			if C.GoString(snapInfo[i].name) == "" {
				return nil
			}

			list = append(list, C.GoString(snapInfo[i].name))
		}

		return nil
	}

	if err := img.pool.wrapOpen(img.imageName, action); err != nil {
		return nil, err
	}

	return list, nil
}