#! /usr/bin/env python3
#
# Copyright 2020 Canonical Ltd
#
# 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.

"""Changes the crush weight of an OSD."""

import charms_ceph.utils as ceph_utils
import logging


logger = logging.getLogger(__name__)


def change_osd_weight(event) -> None:
    """Run reweight_osd to change OSD weight."""
    osd_num = event.params.get("osd")
    new_weight = event.params.get("weight")
    try:
        result = ceph_utils.reweight_osd(str(osd_num), str(new_weight))
    except Exception as e:
        logger.warn(e)
        event.fail("Reweight failed due to exception")
        return

    if not result:
        event.fail("Reweight failed to complete")
        return

    event.set_results({'message': 'success'})