359 lines
13 KiB
Python
359 lines
13 KiB
Python
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import math
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from oslo.utils import excutils
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import six
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from heat.common import exception
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from heat.common import grouputils
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from heat.common.i18n import _
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from heat.common.i18n import _LE
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from heat.common.i18n import _LI
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from heat.engine import constraints
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from heat.engine.notification import autoscaling as notification
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from heat.engine import properties
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from heat.engine.resources import instance_group as instgrp
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from heat.engine import support
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from heat.openstack.common import log as logging
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from heat.scaling import cooldown
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LOG = logging.getLogger(__name__)
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(EXACT_CAPACITY, CHANGE_IN_CAPACITY, PERCENT_CHANGE_IN_CAPACITY) = (
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'ExactCapacity', 'ChangeInCapacity', 'PercentChangeInCapacity')
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def _calculate_new_capacity(current, adjustment, adjustment_type,
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minimum, maximum):
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"""
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Given the current capacity, calculates the new capacity which results
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from applying the given adjustment of the given adjustment-type. The
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new capacity will be kept within the maximum and minimum bounds.
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"""
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if adjustment_type == CHANGE_IN_CAPACITY:
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new_capacity = current + adjustment
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elif adjustment_type == EXACT_CAPACITY:
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new_capacity = adjustment
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else:
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# PercentChangeInCapacity
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delta = current * adjustment / 100.0
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if math.fabs(delta) < 1.0:
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rounded = int(math.ceil(delta) if delta > 0.0
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else math.floor(delta))
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else:
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rounded = int(math.floor(delta) if delta > 0.0
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else math.ceil(delta))
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new_capacity = current + rounded
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if new_capacity > maximum:
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LOG.debug('truncating growth to %s' % maximum)
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return maximum
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if new_capacity < minimum:
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LOG.debug('truncating shrinkage to %s' % minimum)
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return minimum
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return new_capacity
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class AutoScalingGroup(instgrp.InstanceGroup, cooldown.CooldownMixin):
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support_status = support.SupportStatus(version='2014.1')
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PROPERTIES = (
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AVAILABILITY_ZONES, LAUNCH_CONFIGURATION_NAME, MAX_SIZE, MIN_SIZE,
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COOLDOWN, DESIRED_CAPACITY, HEALTH_CHECK_GRACE_PERIOD,
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HEALTH_CHECK_TYPE, LOAD_BALANCER_NAMES, VPCZONE_IDENTIFIER, TAGS,
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) = (
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'AvailabilityZones', 'LaunchConfigurationName', 'MaxSize', 'MinSize',
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'Cooldown', 'DesiredCapacity', 'HealthCheckGracePeriod',
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'HealthCheckType', 'LoadBalancerNames', 'VPCZoneIdentifier', 'Tags',
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)
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_TAG_KEYS = (
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TAG_KEY, TAG_VALUE,
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) = (
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'Key', 'Value',
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)
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_UPDATE_POLICY_SCHEMA_KEYS = (
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ROLLING_UPDATE
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) = (
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'AutoScalingRollingUpdate'
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)
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_ROLLING_UPDATE_SCHEMA_KEYS = (
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MIN_INSTANCES_IN_SERVICE, MAX_BATCH_SIZE, PAUSE_TIME
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) = (
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'MinInstancesInService', 'MaxBatchSize', 'PauseTime'
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)
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properties_schema = {
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AVAILABILITY_ZONES: properties.Schema(
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properties.Schema.LIST,
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_('Not Implemented.'),
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required=True
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),
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LAUNCH_CONFIGURATION_NAME: properties.Schema(
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properties.Schema.STRING,
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_('The reference to a LaunchConfiguration resource.'),
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required=True,
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update_allowed=True
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),
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MAX_SIZE: properties.Schema(
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properties.Schema.INTEGER,
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_('Maximum number of instances in the group.'),
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required=True,
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update_allowed=True
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),
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MIN_SIZE: properties.Schema(
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properties.Schema.INTEGER,
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_('Minimum number of instances in the group.'),
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required=True,
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update_allowed=True
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),
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COOLDOWN: properties.Schema(
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properties.Schema.NUMBER,
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_('Cooldown period, in seconds.'),
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update_allowed=True
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),
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DESIRED_CAPACITY: properties.Schema(
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properties.Schema.INTEGER,
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_('Desired initial number of instances.'),
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update_allowed=True
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),
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HEALTH_CHECK_GRACE_PERIOD: properties.Schema(
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properties.Schema.INTEGER,
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_('Not Implemented.'),
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implemented=False
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),
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HEALTH_CHECK_TYPE: properties.Schema(
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properties.Schema.STRING,
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_('Not Implemented.'),
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constraints=[
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constraints.AllowedValues(['EC2', 'ELB']),
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],
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implemented=False
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),
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LOAD_BALANCER_NAMES: properties.Schema(
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properties.Schema.LIST,
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_('List of LoadBalancer resources.')
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),
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VPCZONE_IDENTIFIER: properties.Schema(
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properties.Schema.LIST,
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_('Use only with Neutron, to list the internal subnet to '
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'which the instance will be attached; '
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'needed only if multiple exist; '
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'list length must be exactly 1.'),
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schema=properties.Schema(
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properties.Schema.STRING,
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_('UUID of the internal subnet to which the instance '
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'will be attached.')
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)
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),
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TAGS: properties.Schema(
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properties.Schema.LIST,
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_('Tags to attach to this group.'),
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schema=properties.Schema(
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properties.Schema.MAP,
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schema={
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TAG_KEY: properties.Schema(
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properties.Schema.STRING,
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required=True
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),
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TAG_VALUE: properties.Schema(
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properties.Schema.STRING,
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required=True
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),
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},
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)
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),
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}
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rolling_update_schema = {
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MIN_INSTANCES_IN_SERVICE: properties.Schema(properties.Schema.INTEGER,
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default=0),
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MAX_BATCH_SIZE: properties.Schema(properties.Schema.INTEGER,
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default=1),
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PAUSE_TIME: properties.Schema(properties.Schema.STRING,
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default='PT0S')
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}
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update_policy_schema = {
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ROLLING_UPDATE: properties.Schema(
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properties.Schema.MAP,
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schema=rolling_update_schema)
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}
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def handle_create(self):
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self.validate_launchconfig()
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return self.create_with_template(self.child_template(),
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self._environment())
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def _get_conf_properties(self):
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conf, props = super(AutoScalingGroup, self)._get_conf_properties()
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vpc_zone_ids = self.properties.get(AutoScalingGroup.VPCZONE_IDENTIFIER)
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if vpc_zone_ids:
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props['SubnetId'] = vpc_zone_ids[0]
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return conf, props
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def check_create_complete(self, task):
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"""Invoke the cooldown after creation succeeds."""
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done = super(AutoScalingGroup, self).check_create_complete(task)
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if done:
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self._cooldown_timestamp(
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"%s : %s" % (EXACT_CAPACITY, grouputils.get_size(self)))
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return done
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def handle_update(self, json_snippet, tmpl_diff, prop_diff):
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"""
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If Properties has changed, update self.properties, so we get the new
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values during any subsequent adjustment.
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"""
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if tmpl_diff:
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# parse update policy
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if 'UpdatePolicy' in tmpl_diff:
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up = json_snippet.update_policy(self.update_policy_schema,
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self.context)
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self.update_policy = up
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self.properties = json_snippet.properties(self.properties_schema,
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self.context)
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if prop_diff:
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# Replace instances first if launch configuration has changed
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self._try_rolling_update(prop_diff)
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if self.properties[self.DESIRED_CAPACITY] is not None:
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self.adjust(self.properties[self.DESIRED_CAPACITY],
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adjustment_type=EXACT_CAPACITY)
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else:
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current_capacity = grouputils.get_size(self)
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self.adjust(current_capacity, adjustment_type=EXACT_CAPACITY)
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def adjust(self, adjustment, adjustment_type=CHANGE_IN_CAPACITY):
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"""
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Adjust the size of the scaling group if the cooldown permits.
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"""
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if self._cooldown_inprogress():
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LOG.info(_LI("%(name)s NOT performing scaling adjustment, "
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"cooldown %(cooldown)s"),
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{'name': self.name,
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'cooldown': self.properties[self.COOLDOWN]})
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return
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capacity = grouputils.get_size(self)
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lower = self.properties[self.MIN_SIZE]
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upper = self.properties[self.MAX_SIZE]
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new_capacity = _calculate_new_capacity(capacity, adjustment,
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adjustment_type, lower, upper)
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total = grouputils.get_size(self, include_failed=True)
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# if there are failed resources in nested_stack, has to change
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if new_capacity == total:
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LOG.debug('no change in capacity %d' % capacity)
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return
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# send a notification before, on-error and on-success.
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notif = {
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'stack': self.stack,
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'adjustment': adjustment,
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'adjustment_type': adjustment_type,
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'capacity': capacity,
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'groupname': self.FnGetRefId(),
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'message': _("Start resizing the group %(group)s") % {
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'group': self.FnGetRefId()},
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'suffix': 'start',
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}
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notification.send(**notif)
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try:
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self.resize(new_capacity)
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except Exception as resize_ex:
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with excutils.save_and_reraise_exception():
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try:
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notif.update({'suffix': 'error',
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'message': six.text_type(resize_ex),
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})
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notification.send(**notif)
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except Exception:
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LOG.exception(_LE('Failed sending error notification'))
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else:
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notif.update({
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'suffix': 'end',
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'capacity': new_capacity,
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'message': _("End resizing the group %(group)s") % {
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'group': notif['groupname']},
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})
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notification.send(**notif)
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self._cooldown_timestamp("%s : %s" % (adjustment_type, adjustment))
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def _tags(self):
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"""Add Identifing Tags to all servers in the group.
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This is so the Dimensions received from cfn-push-stats all include
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the groupname and stack id.
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Note: the group name must match what is returned from FnGetRefId
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"""
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autoscaling_tag = [{self.TAG_KEY: 'metering.AutoScalingGroupName',
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self.TAG_VALUE: self.FnGetRefId()}]
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return super(AutoScalingGroup, self)._tags() + autoscaling_tag
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def validate(self):
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res = super(AutoScalingGroup, self).validate()
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if res:
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return res
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# check validity of group size
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min_size = self.properties[self.MIN_SIZE]
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max_size = self.properties[self.MAX_SIZE]
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if max_size < min_size:
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msg = _("MinSize can not be greater than MaxSize")
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raise exception.StackValidationFailed(message=msg)
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if min_size < 0:
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msg = _("The size of AutoScalingGroup can not be less than zero")
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raise exception.StackValidationFailed(message=msg)
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if self.properties[self.DESIRED_CAPACITY] is not None:
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desired_capacity = self.properties[self.DESIRED_CAPACITY]
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if desired_capacity < min_size or desired_capacity > max_size:
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msg = _("DesiredCapacity must be between MinSize and MaxSize")
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raise exception.StackValidationFailed(message=msg)
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# TODO(pasquier-s): once Neutron is able to assign subnets to
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# availability zones, it will be possible to specify multiple subnets.
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# For now, only one subnet can be specified. The bug #1096017 tracks
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# this issue.
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if self.properties.get(self.VPCZONE_IDENTIFIER) and \
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len(self.properties[self.VPCZONE_IDENTIFIER]) != 1:
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raise exception.NotSupported(feature=_("Anything other than one "
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"VPCZoneIdentifier"))
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def child_template(self):
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if self.properties[self.DESIRED_CAPACITY]:
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num_instances = self.properties[self.DESIRED_CAPACITY]
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else:
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num_instances = self.properties[self.MIN_SIZE]
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return self._create_template(num_instances)
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def resource_mapping():
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return {
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'AWS::AutoScaling::AutoScalingGroup': AutoScalingGroup,
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}
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