#
# Copyright 2013 IBM Corp
#
# 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.

from oslo_log import log
from oslo_utils import timeutils

from ceilometer import dispatcher
from ceilometer.event.storage import models
from ceilometer.i18n import _LE
from ceilometer import storage

LOG = log.getLogger(__name__)


class DatabaseDispatcher(dispatcher.EventDispatcherBase):
    """Dispatcher class for recording metering data into database.

    The dispatcher class which records each meter into a database configured
    in ceilometer configuration file.

    To enable this dispatcher, the following section needs to be present in
    ceilometer.conf file

    [DEFAULT]
    meter_dispatchers = database
    event_dispatchers = database
    """

    def __init__(self, conf):
        super(DatabaseDispatcher, self).__init__(conf)
        self.event_conn = storage.get_connection_from_config(self.conf)

    def record_events(self, events):
        if not isinstance(events, list):
            events = [events]

        event_list = []
        for ev in events:
            try:
                event_list.append(
                    models.Event(
                        message_id=ev['message_id'],
                        event_type=ev['event_type'],
                        generated=timeutils.normalize_time(
                            timeutils.parse_isotime(ev['generated'])),
                        traits=[models.Trait(
                                name, dtype,
                                models.Trait.convert_value(dtype, value))
                                for name, dtype, value in ev['traits']],
                        raw=ev.get('raw', {}))
                )
            except Exception:
                LOG.exception(_LE("Error processing event and it will be "
                                  "dropped: %s"), ev)
        self.event_conn.record_events(event_list)