deb-heat/heat/scaling/cooldown.py
Julien Danjou 6519cf36fd Switch to oslo.utils
Change-Id: I74979d8f75b099858314a30c98bb252c379e0304
2014-09-30 14:27:59 +02:00

45 lines
1.7 KiB
Python

#
# 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.utils import timeutils
class CooldownMixin(object):
'''
Utility class to encapsulate Cooldown related logic which is shared
between AutoScalingGroup and ScalingPolicy
'''
def _cooldown_inprogress(self):
inprogress = False
try:
# Negative values don't make sense, so they are clamped to zero
cooldown = max(0, self.properties[self.COOLDOWN])
except TypeError:
# If not specified, it will be None, same as cooldown == 0
cooldown = 0
metadata = self.metadata_get()
if metadata and cooldown != 0:
last_adjust = metadata.keys()[0]
if not timeutils.is_older_than(last_adjust, cooldown):
inprogress = True
return inprogress
def _cooldown_timestamp(self, reason):
# Save resource metadata with a timestamp and reason
# If we wanted to implement the AutoScaling API like AWS does,
# we could maintain event history here, but since we only need
# the latest event for cooldown, just store that for now
metadata = {timeutils.strtime(): reason}
self.metadata_set(metadata)