# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright (c) 2011 OpenStack, LLC.
# All Rights Reserved.
#
#    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.

"""
Handles all processes within the Guest VM, considering it as a Platform

The :py:class:`GuestManager` class is a :py:class:`nova.manager.Manager` that
handles RPC calls relating to Platform specific operations.

**Related Flags**

"""


from reddwarf.common import utils
from reddwarf.openstack.common import log as logging


LOG = logging.getLogger(__name__)
SERVICE_REGISTRY = {
    'mysql': 'reddwarf.guestagent.manager.mysql.Manager',
    'percona': 'reddwarf.guestagent.manager.mysql.Manager', }


class Interrogator(object):
    def get_filesystem_volume_stats(self, fs_path):
        out, err = utils.execute_with_timeout(
            "stat",
            "-f",
            "-t",
            fs_path)
        if err:
            LOG.error(err)
            raise RuntimeError("Filesystem not found (%s) : %s"
                               % (fs_path, err))
        stats = out.split()
        output = {'block_size': int(stats[4]),
                  'total_blocks': int(stats[6]),
                  'free_blocks': int(stats[7]),
                  'total': int(stats[6]) * int(stats[4]),
                  'free': int(stats[7]) * int(stats[4])}
        output['used'] = int(output['total']) - int(output['free'])
        return output