import socket


def generate_cluster_tle_source(launch_id):
    """Helper method
    Generates the identificator for the source of the cluster TLE files.

    :param launch_id: Identifier of the UFO (sequential number)
    :return: String with the complete TLE source
    """
    return 'https://' + socket.getfqdn() + '/cluster/' + str(launch_id)