def get_package_url(cls, package, session=None, silent=False):
        response = get("{}/packages/{}".format(cls.bower_base_uri, package))
        return response.json().get("url", None)
def implementor(rpc_code, blocking=False):
    """
    RPC implementation function.
    """
    return partial(_add_implementor, rpc_code, blocking)