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#
# -------------------------------------------------------------------------
# Copyright (c) 2019 AT&T Intellectual Property
#
# 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 . import filter_utils
from valet.engine.app_manager.group import Group
from valet.engine.app_manager.server import Server
class AvailabilityZoneFilter(object):
"""Filters Hosts by availability zone.
Works with aggregate metadata availability zones, using the key 'availability_zone'.
Note: in theory a compute node can be part of multiple availability_zones
"""
def __init__(self):
self.name = "availability-zone"
self.status = None
def init_condition(self):
self.status = None
def check_pre_condition(self, _level, _v, _avail_hosts, _avail_groups):
if (isinstance(_v, Server) and _v.availability_zone is not None) or \
(isinstance(_v, Group) and len(_v.availability_zone_list) > 0):
return True
else:
return False
def filter_candidates(self, _level, _v, _candidate_list):
candidate_list = []
for c in _candidate_list:
if self._check_candidate(_level, _v, c):
candidate_list.append(c)
return candidate_list
def _check_candidate(self, _level, _v, _candidate):
az_request_list = []
if isinstance(_v, Server):
az_request_list.append(_v.availability_zone)
else:
for az in _v.availability_zone_list:
az_request_list.append(az)
if len(az_request_list) == 0:
return True
availability_zone_list = filter_utils.availability_zone_get_by_host(_level, _candidate)
for azr in az_request_list:
if azr not in availability_zone_list:
return False
return True
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