# 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 django.utils.translation import ugettext_lazy as _

from horizon import exceptions

from openstack_dashboard import api


def availability_zone_list(request):
    """Utility method to retrieve a list of availability zones."""
    try:
        if api.cinder.extension_supported(request, 'AvailabilityZones'):
            return api.cinder.availability_zone_list(request)
        return []
    except Exception:
        exceptions.handle(request,
                          _('Unable to retrieve volumes availability zones.'))
        return []
