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
#
# 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.
import six
from heat.common import exception
from heat.common.i18n import _
from heat.engine import attributes
from heat.engine import constraints
from heat.engine import properties
from heat.engine.resources.openstack.heat import scaling_policy as heat_sp
from heat.scaling import scalingutil as sc_util
class AWSScalingPolicy(heat_sp.AutoScalingPolicy):
PROPERTIES = (
AUTO_SCALING_GROUP_NAME, SCALING_ADJUSTMENT, ADJUSTMENT_TYPE,
COOLDOWN, MIN_ADJUSTMENT_STEP,
) = (
'AutoScalingGroupName', 'ScalingAdjustment', 'AdjustmentType',
'Cooldown', 'MinAdjustmentStep',
)
ATTRIBUTES = (
ALARM_URL,
) = (
'AlarmUrl',
)
properties_schema = {
AUTO_SCALING_GROUP_NAME: properties.Schema(
properties.Schema.STRING,
_('AutoScaling group name to apply policy to.'),
required=True
),
SCALING_ADJUSTMENT: properties.Schema(
properties.Schema.INTEGER,
_('Size of adjustment.'),
required=True,
update_allowed=True
),
ADJUSTMENT_TYPE: properties.Schema(
properties.Schema.STRING,
_('Type of adjustment (absolute or percentage).'),
required=True,
constraints=[
constraints.AllowedValues(
[sc_util.CFN_CHANGE_IN_CAPACITY,
sc_util.CFN_EXACT_CAPACITY,
sc_util.CFN_PERCENT_CHANGE_IN_CAPACITY]),
],
update_allowed=True
),
COOLDOWN: properties.Schema(
properties.Schema.INTEGER,
_('Cooldown period, in seconds.'),
update_allowed=True
),
MIN_ADJUSTMENT_STEP: properties.Schema(
properties.Schema.INTEGER,
_('Minimum number of resources that are added or removed '
'when the AutoScaling group scales up or down. This can '
'be used only when specifying PercentChangeInCapacity '
'for the AdjustmentType property.'),
constraints=[
constraints.Range(
min=0,
),
],
update_allowed=True
),
}
attributes_schema = {
ALARM_URL: attributes.Schema(
_("A signed url to handle the alarm. (Heat extension)."),
type=attributes.Schema.STRING,
cache_mode=attributes.Schema.CACHE_NONE
),
}
def _validate_min_adjustment_step(self):
adjustment_type = self.properties.get(self.ADJUSTMENT_TYPE)
adjustment_step = self.properties.get(self.MIN_ADJUSTMENT_STEP)
if (adjustment_type != sc_util.CFN_PERCENT_CHANGE_IN_CAPACITY
and adjustment_step is not None):
raise exception.ResourcePropertyValueDependency(
prop1=self.MIN_ADJUSTMENT_STEP,
prop2=self.ADJUSTMENT_TYPE,
value=sc_util.CFN_PERCENT_CHANGE_IN_CAPACITY)
def get_reference_id(self):
if self.resource_id is not None:
return six.text_type(self._get_ec2_signed_url(never_expire=True))
else:
return six.text_type(self.name)
def resource_mapping():
return {
'AWS::AutoScaling::ScalingPolicy': AWSScalingPolicy,
}