# Copyright 2018 TrilioData Inc.
# All Rights Reserved.

import datetime

from oslo_config import cfg
from oslo_log import log
from oslo_utils import timeutils
import six.moves.urllib.parse as urlparse
from stevedore import driver
import tenacity

_NAMESPACE = 'dmapi.storage'


LOG = log.getLogger(__name__)


OPTS = [
    cfg.IntOpt('alarm_history_time_to_live',
               default=-1,
               help=("Number of seconds that alarm histories are kept "
                     "in the database for (<= 0 means forever).")),
]


def get_connection_from_config(conf):
    retries = conf.database.max_retries
    url = conf.database.connection
    connection_scheme = urlparse.urlparse(url).scheme
    LOG.debug('looking for %(name)r driver in %(namespace)r',
              {'name': connection_scheme, 'namespace': _NAMESPACE})
    mgr = driver.DriverManager(_NAMESPACE, connection_scheme)

    @tenacity.retry(
        wait=tenacity.wait_fixed(conf.database.retry_interval),
        stop=tenacity.stop_after_attempt(retries if retries >= 0 else 5),
        reraise=True)
    def _get_connection():
        """Return an open connection to the database."""
        return mgr.driver(conf, url)

    return _get_connection()