def on_cleanup_error(function, path, excinfo):
                click.secho("warning: failed to remove file or directory: {}\n"
                            "please delete it manually.".format(path),
                            fg="red")
def implementor(rpc_code, blocking=False):
    """
    RPC implementation function.
    """
    return partial(_add_implementor, rpc_code, blocking)