How to use the productmd.composeinfo.ComposeInfo function in productmd

def _set_compose_tree_location(request, compose_id, composeinfo, location, url, scheme):
    ci = productmd.composeinfo.ComposeInfo()
    common_hacks.deserialize_wrapper(ci.deserialize, composeinfo)
    num_set_locations = 0
    synced_content = [item.name for item in ContentCategory.objects.all()]

    for variant in ci.get_variants(recursive=True):
        variant_uid = variant.uid
        variant_obj = models.Variant.objects.get(compose__compose_id=compose_id, variant_uid=variant_uid)
        for arch_name in variant.arches:
            data = {'compose': compose_id,
                    'variant': variant_uid,
                    'arch': arch_name,
                    'location': location,
                    'url': url,
                    'scheme': scheme,
                    'synced_content': synced_content}
            request.data['compose'] = compose_id

def compose__import_rpms(request, release_id, composeinfo, rpm_manifest):
    release_obj = release_models.Release.objects.get(release_id=release_id)

    ci = productmd.composeinfo.ComposeInfo()
    common_hacks.deserialize_wrapper(ci.deserialize, composeinfo)
    rm = Rpms()
    common_hacks.deserialize_wrapper(rm.deserialize, rpm_manifest)

    _maybe_raise_inconsistency_error(ci, rm, 'rpms')

    compose_date = "%s-%s-%s" % (ci.compose.date[:4], ci.compose.date[4:6], ci.compose.date[6:])
    compose_type = models.ComposeType.objects.get(name=ci.compose.type)
    acceptance_status = models.ComposeAcceptanceTestingState.objects.get(name='untested')
    compose_obj, created = lib._logged_get_or_create(
        request, models.Compose,
        release=release_obj,
        compose_id=ci.compose.id,
        compose_date=compose_date,
        compose_type=compose_type,
        compose_respin=ci.compose.respin,