#!/usr/bin/env python
# Copyright 2013-2018 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:
# - Mario Lassnig, <mario.lassnig@cern.ch>, 2013-2015
# - Wen Guan, <wguan.icedew@gmail.com>, 2014-2015
# - Vincent Garonne, <vgaronne@gmail.com>, 2018
# - Cedric Serfon <cedric.serfon@cern.ch>, 2018
#
# PY3K COMPATIBLE

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

import argparse
import signal

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


def get_parser():
    """
    Returns the argparse parser.
    """
    parser = argparse.ArgumentParser(description="Conveyor is a daemon to manage file transfers. The conveyor-poller is in charge of poll the transfer tool to check if the submitted transfers are already done.")
    parser.add_argument("--run-once", action="store_true", default=False,
                        help='One iteration only')
    parser.add_argument("--fts-bulk", action="store", default=100, type=int,
                        help='Bulk control: number of transfers per FTS query')
    parser.add_argument("--db-bulk", action="store", default=1000, type=int,
                        help='Bulk control: number of transfers per db query')
    parser.add_argument("--older-than", action="store", default=60, type=int,
                        help='Poll control: older request more than this value to poll')
    parser.add_argument('--sleep-time', action="store", default=300, type=int,
                        help='Seconds to sleep if few requests')
    parser.add_argument('--activities', nargs='+', type=str,
                        help='Explicit list of activities to include')
    parser.add_argument('--activity-shares', action='store', default=None, type=str,
                        help='JSON-encoded string of an activity shares dictionary {"act_1": 0.2, "act_2": 0.4, ...}')
    parser.add_argument('--total-threads', action="store", default=1, type=int,
                        help='Concurrency control: total number of threads for this process')

    return parser


if __name__ == "__main__":

    signal.signal(signal.SIGTERM, stop)
    parser = get_parser()
    args = parser.parse_args()
    try:
        run(once=args.run_once,
            fts_bulk=args.fts_bulk,
            db_bulk=args.db_bulk,
            older_than=args.older_than,
            sleep_time=args.sleep_time,
            activities=args.activities,
            activity_shares=args.activity_shares,
            total_threads=args.total_threads)
    except KeyboardInterrupt:
        stop()
