# Copyright (C) 2015-2020 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

import os
import sys
import atexit
import logging
import signal
import rhodecode

log = logging.getLogger(__name__)

cache_keys_by_pid = set()


def sigHandler(signo, frame):
    """
    signals trigger sys.exit so there's a single handler to cleanup the code.
    """
    if rhodecode.is_test:
        return

    sys.exit(0)


def free_cache_keys(*args):
    from rhodecode.model.db import Session, CacheKey

    if rhodecode.is_test:
        return

    ssh_cmd = os.environ.get('RC_CMD_SSH_WRAPPER')
    if ssh_cmd:
        return

    if cache_keys_by_pid:
        try:
            for cache_proc in set(cache_keys_by_pid):
                like_expression = '{}%'.format(cache_proc)
                qry = CacheKey.query().filter(CacheKey.cache_key.like(like_expression))
                count = qry.count()
                log.info('Clearing %s: %s cache keys, total: %s', cache_proc, len(cache_keys_by_pid), count)
                qry.delete(synchronize_session='fetch')
                cache_keys_by_pid.remove(cache_proc)
            Session().commit()
        except Exception:
            log.exception('Failed to clear keys, exiting gracefully')

atexit.register(free_cache_keys)

signal.signal(signal.SIGTERM, sigHandler)
signal.signal(signal.SIGINT, sigHandler)