#!/usr/bin/env python
# Copyright 2016-2018 CERN for the benefit of the ATLAS collaboration.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Authors:
# - Wen Guan, <wguan.icedew@gmail.com>, 2016
# - Vincent Garonne, <vgaronne@gmail.com>, 2018

"""
Conveyor is a daemon to manage file transfers.
"""

import argparse
import signal

from rucio.daemons.conveyor.throttler import run, stop


def get_parser():
    """
    Returns the argparse parser.
    """
    parser = argparse.ArgumentParser()
    parser.add_argument("--run-once", action="store_true", default=False,
                        help='One iteration only')
    parser.add_argument('--sleep-time', action="store", default=600, type=int,
                        help='Seconds to sleep if few requests')
    return parser


if __name__ == "__main__":
    signal.signal(signal.SIGTERM, stop)
    parser = get_parser()
    args = parser.parse_args()
    try:
        run(once=args.run_once, sleep_time=args.sleep_time)
    except KeyboardInterrupt:
        stop()
