def groups_option(f):
    new_func = click.option("-g", "--groups",
                            help="Comma-separated list of requirement groups "
                            "to include.")(f)
    return update_wrapper(new_func, f)
def implementor(rpc_code, blocking=False):
    """
    RPC implementation function.
    """
    return partial(_add_implementor, rpc_code, blocking)