OpenStack Orchestration (Heat)
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# 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
# 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
import six
class CooldownMixin(object):
Utility class to encapsulate Cooldown related logic which is shared
between AutoScalingGroup and ScalingPolicy. This logic includes both
cooldown timestamp comparing and scaling in progress checking.
def _cooldown_inprogress(self):
inprogress = False
# Negative values don't make sense, so they are clamped to zero
cooldown = max(0,[self.COOLDOWN])
except TypeError:
# If not specified, it will be None, same as cooldown == 0
cooldown = 0
metadata = self.metadata_get()
if metadata.get('scaling_in_progress'):
return True
if 'cooldown' not in metadata:
# Note: this is for supporting old version cooldown checking
if metadata and cooldown != 0:
last_adjust = next(six.iterkeys(metadata))
if not timeutils.is_older_than(last_adjust, cooldown):
inprogress = True
elif cooldown != 0:
last_adjust = next(six.iterkeys(metadata['cooldown']))
if not timeutils.is_older_than(last_adjust, cooldown):
inprogress = True
if not inprogress:
metadata['scaling_in_progress'] = True
return inprogress
def _cooldown_timestamp(self, reason):
# Save cooldown timestamp into metadata and clean the
# scaling_in_progress state.
# 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 = self.metadata_get()
metadata['cooldown'] = {timeutils.utcnow().isoformat(): reason}
metadata['scaling_in_progress'] = False