860 lines
32 KiB
Python
860 lines
32 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 copy
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import math
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import six
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from heat.common import exception
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from heat.common import timeutils as iso8601utils
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from heat.engine import attributes
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from heat.engine import constraints
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from heat.engine import environment
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from heat.engine import function
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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 import rsrc_defn
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from heat.engine import scheduler
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from heat.engine import stack_resource
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from heat.openstack.common import excutils
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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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from heat.scaling import template
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LOG = logging.getLogger(__name__)
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(SCALED_RESOURCE_TYPE,) = ('OS::Heat::ScaledResource',)
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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 InstanceGroup(stack_resource.StackResource):
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PROPERTIES = (
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AVAILABILITY_ZONES, LAUNCH_CONFIGURATION_NAME, SIZE,
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LOAD_BALANCER_NAMES, TAGS,
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) = (
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'AvailabilityZones', 'LaunchConfigurationName', 'Size',
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'LoadBalancerNames', '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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_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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_UPDATE_POLICY_SCHEMA_KEYS = (ROLLING_UPDATE,) = ('RollingUpdate',)
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ATTRIBUTES = (
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INSTANCE_LIST,
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) = (
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'InstanceList',
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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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_('Name of LaunchConfiguration resource.'),
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required=True,
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update_allowed=True
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),
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SIZE: properties.Schema(
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properties.Schema.INTEGER,
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_('Desired number of instances.'),
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required=True,
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update_allowed=True
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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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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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attributes_schema = {
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INSTANCE_LIST: attributes.Schema(
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_("A comma-delimited list of server ip addresses. "
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"(Heat extension).")
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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.NUMBER,
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default=0),
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MAX_BATCH_SIZE: properties.Schema(properties.Schema.NUMBER,
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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(properties.Schema.MAP,
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schema=rolling_update_schema)
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}
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def __init__(self, name, json_snippet, stack):
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"""
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UpdatePolicy is currently only specific to InstanceGroup and
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AutoScalingGroup. Therefore, init is overridden to parse for the
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UpdatePolicy.
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"""
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super(InstanceGroup, self).__init__(name, json_snippet, stack)
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self.update_policy = self.t.update_policy(self.update_policy_schema,
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self.context)
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def validate(self):
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"""
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Add validation for update_policy
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"""
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super(InstanceGroup, self).validate()
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if self.update_policy:
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self.update_policy.validate()
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policy_name = self.update_policy_schema.keys()[0]
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if self.update_policy[policy_name]:
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pause_time = self.update_policy[policy_name][self.PAUSE_TIME]
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if iso8601utils.parse_isoduration(pause_time) > 3600:
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raise ValueError('Maximum PauseTime is 1 hour.')
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def get_instance_names(self):
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"""Get a list of resource names of the instances in this InstanceGroup.
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Failed resources will be ignored.
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"""
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return [r.name for r in self.get_instances()]
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def get_instances(self):
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"""Get a list of all the instance resources managed by this group.
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Sort the list of instances first by created_time then by name.
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"""
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resources = []
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if self.nested():
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resources = [resource for resource in self.nested().itervalues()
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if resource.status != resource.FAILED]
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return sorted(resources, key=lambda r: (r.created_time, r.name))
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def _environment(self):
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"""Return the environment for the nested stack."""
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return {
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environment.PARAMETERS: {},
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environment.RESOURCE_REGISTRY: {
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SCALED_RESOURCE_TYPE: 'AWS::EC2::Instance',
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},
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}
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def handle_create(self):
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"""Create a nested stack and add the initial resources to it."""
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num_instances = self.properties[self.SIZE]
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initial_template = self._create_template(num_instances)
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return self.create_with_template(initial_template, self._environment())
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def check_create_complete(self, task):
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"""
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When stack creation is done, update the load balancer.
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If any instances failed to be created, delete them.
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"""
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done = super(InstanceGroup, self).check_create_complete(task)
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if done:
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self._lb_reload()
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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
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get the new 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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if prop_diff:
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self.properties = json_snippet.properties(self.properties_schema,
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self.context)
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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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# Get the current capacity, we may need to adjust if
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# Size has changed
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if self.SIZE in prop_diff:
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inst_list = self.get_instances()
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if len(inst_list) != self.properties[self.SIZE]:
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self.resize(self.properties[self.SIZE])
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def _tags(self):
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"""
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Make sure that we add a tag that Ceilometer can pick up.
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These need to be prepended with 'metering.'.
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"""
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tags = self.properties.get(self.TAGS) or []
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for t in tags:
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if t[self.TAG_KEY].startswith('metering.'):
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# the user has added one, don't add another.
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return tags
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return tags + [{self.TAG_KEY: 'metering.groupname',
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self.TAG_VALUE: self.FnGetRefId()}]
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def handle_delete(self):
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return self.delete_nested()
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def _get_instance_definition(self):
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conf_refid = self.properties[self.LAUNCH_CONFIGURATION_NAME]
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conf = self.stack.resource_by_refid(conf_refid)
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props = function.resolve(conf.properties.data)
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props['Tags'] = self._tags()
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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 rsrc_defn.ResourceDefinition(None,
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SCALED_RESOURCE_TYPE,
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props,
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conf.t.metadata())
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def _get_instance_templates(self):
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"""Get templates for resource instances."""
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return [(instance.name, instance.t)
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for instance in self.get_instances()]
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def _create_template(self, num_instances, num_replace=0,
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template_version=('HeatTemplateFormatVersion',
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'2012-12-12')):
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"""
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Create a template to represent autoscaled instances.
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Also see heat.scaling.template.resource_templates.
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"""
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instance_definition = self._get_instance_definition()
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old_resources = self._get_instance_templates()
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definitions = template.resource_templates(
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old_resources, instance_definition, num_instances, num_replace)
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return template.make_template(definitions, version=template_version)
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def _try_rolling_update(self, prop_diff):
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if (self.update_policy[self.ROLLING_UPDATE] and
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self.LAUNCH_CONFIGURATION_NAME in prop_diff):
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policy = self.update_policy[self.ROLLING_UPDATE]
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pause_sec = iso8601utils.parse_isoduration(policy[self.PAUSE_TIME])
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self._replace(policy[self.MIN_INSTANCES_IN_SERVICE],
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policy[self.MAX_BATCH_SIZE],
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pause_sec)
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def _replace(self, min_in_service, batch_size, pause_sec):
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"""
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Replace the instances in the group using updated launch configuration
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"""
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def changing_instances(tmpl):
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instances = self.get_instances()
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current = set((i.name, i.t) for i in instances)
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updated = set(tmpl.resource_definitions(self.nested()).items())
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# includes instances to be updated and deleted
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affected = set(k for k, v in current ^ updated)
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return set(i.FnGetRefId() for i in instances if i.name in affected)
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def pause_between_batch():
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while True:
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try:
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yield
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except scheduler.Timeout:
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return
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capacity = len(self.nested()) if self.nested() else 0
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efft_bat_sz = min(batch_size, capacity)
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efft_min_sz = min(min_in_service, capacity)
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batch_cnt = (capacity + efft_bat_sz - 1) // efft_bat_sz
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if pause_sec * (batch_cnt - 1) >= self.stack.timeout_secs():
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raise ValueError('The current UpdatePolicy will result '
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'in stack update timeout.')
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# effective capacity includes temporary capacity added to accommodate
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# the minimum number of instances in service during update
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efft_capacity = max(capacity - efft_bat_sz, efft_min_sz) + efft_bat_sz
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try:
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remainder = capacity
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while remainder > 0 or efft_capacity > capacity:
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if capacity - remainder >= efft_min_sz:
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efft_capacity = capacity
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template = self._create_template(efft_capacity, efft_bat_sz)
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self._lb_reload(exclude=changing_instances(template))
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updater = self.update_with_template(template,
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self._environment())
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updater.run_to_completion()
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self.check_update_complete(updater)
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remainder -= efft_bat_sz
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if remainder > 0 and pause_sec > 0:
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self._lb_reload()
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waiter = scheduler.TaskRunner(pause_between_batch)
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waiter(timeout=pause_sec)
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finally:
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self._lb_reload()
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def resize(self, new_capacity):
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"""
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Resize the instance group to the new capacity.
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When shrinking, the oldest instances will be removed.
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"""
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new_template = self._create_template(new_capacity)
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try:
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updater = self.update_with_template(new_template,
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self._environment())
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updater.run_to_completion()
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self.check_update_complete(updater)
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finally:
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# Reload the LB in any case, so it's only pointing at healthy
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# nodes.
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self._lb_reload()
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def _lb_reload(self, exclude=None):
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'''
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Notify the LoadBalancer to reload its config to include
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the changes in instances we have just made.
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This must be done after activation (instance in ACTIVE state),
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otherwise the instances' IP addresses may not be available.
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'''
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exclude = exclude or []
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if self.properties[self.LOAD_BALANCER_NAMES]:
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id_list = [inst.FnGetRefId() for inst in self.get_instances()
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if inst.FnGetRefId() not in exclude]
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for lb in self.properties[self.LOAD_BALANCER_NAMES]:
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lb_resource = self.stack[lb]
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props = copy.copy(lb_resource.properties.data)
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if 'Instances' in lb_resource.properties_schema:
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props['Instances'] = id_list
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elif 'members' in lb_resource.properties_schema:
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props['members'] = id_list
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else:
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raise exception.Error(
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_("Unsupported resource '%s' in LoadBalancerNames") %
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(lb,))
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lb_defn = rsrc_defn.ResourceDefinition(
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lb_resource.name,
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lb_resource.type(),
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props,
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lb_resource.t.get('Metadata'),
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deletion_policy=lb_resource.t.get('DeletionPolicy'))
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scheduler.TaskRunner(lb_resource.update, lb_defn)()
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def FnGetRefId(self):
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return self.physical_resource_name_or_FnGetRefId()
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def _resolve_attribute(self, name):
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'''
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heat extension: "InstanceList" returns comma delimited list of server
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ip addresses.
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'''
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if name == self.INSTANCE_LIST:
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return u','.join(inst.FnGetAtt('PublicIp')
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for inst in self.get_instances()) or None
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def child_template(self):
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num_instances = int(self.properties[self.SIZE])
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return self._create_template(num_instances)
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def child_params(self):
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return self._environment()
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class AutoScalingGroup(InstanceGroup, cooldown.CooldownMixin):
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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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_('Name of 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 '
|
|
'which the instance will be attached; '
|
|
'needed only if multiple exist; '
|
|
'list length must be exactly 1.'),
|
|
schema=properties.Schema(
|
|
properties.Schema.STRING,
|
|
_('UUID of the internal subnet to which the instance '
|
|
'will be attached.')
|
|
)
|
|
),
|
|
TAGS: properties.Schema(
|
|
properties.Schema.LIST,
|
|
_('Tags to attach to this group.'),
|
|
schema=properties.Schema(
|
|
properties.Schema.MAP,
|
|
schema={
|
|
TAG_KEY: properties.Schema(
|
|
properties.Schema.STRING,
|
|
required=True
|
|
),
|
|
TAG_VALUE: properties.Schema(
|
|
properties.Schema.STRING,
|
|
required=True
|
|
),
|
|
},
|
|
)
|
|
),
|
|
}
|
|
|
|
rolling_update_schema = {
|
|
MIN_INSTANCES_IN_SERVICE: properties.Schema(properties.Schema.INTEGER,
|
|
default=0),
|
|
MAX_BATCH_SIZE: properties.Schema(properties.Schema.INTEGER,
|
|
default=1),
|
|
PAUSE_TIME: properties.Schema(properties.Schema.STRING,
|
|
default='PT0S')
|
|
}
|
|
|
|
update_policy_schema = {
|
|
ROLLING_UPDATE: properties.Schema(
|
|
properties.Schema.MAP,
|
|
schema=rolling_update_schema)
|
|
}
|
|
|
|
def handle_create(self):
|
|
return self.create_with_template(self.child_template(),
|
|
self._environment())
|
|
|
|
def check_create_complete(self, task):
|
|
"""Invoke the cooldown after creation succeeds."""
|
|
done = super(AutoScalingGroup, self).check_create_complete(task)
|
|
if done:
|
|
self._cooldown_timestamp(
|
|
"%s : %s" % (EXACT_CAPACITY, len(self.get_instances())))
|
|
return done
|
|
|
|
def handle_update(self, json_snippet, tmpl_diff, prop_diff):
|
|
"""
|
|
If Properties has changed, update self.properties, so we get the new
|
|
values during any subsequent adjustment.
|
|
"""
|
|
if tmpl_diff:
|
|
# parse update policy
|
|
if 'UpdatePolicy' in tmpl_diff:
|
|
up = json_snippet.update_policy(self.update_policy_schema,
|
|
self.context)
|
|
self.update_policy = up
|
|
|
|
if prop_diff:
|
|
self.properties = json_snippet.properties(self.properties_schema,
|
|
self.context)
|
|
|
|
# Replace instances first if launch configuration has changed
|
|
self._try_rolling_update(prop_diff)
|
|
|
|
if (self.DESIRED_CAPACITY in prop_diff and
|
|
self.properties[self.DESIRED_CAPACITY] is not None):
|
|
|
|
self.adjust(self.properties[self.DESIRED_CAPACITY],
|
|
adjustment_type=EXACT_CAPACITY)
|
|
else:
|
|
current_capacity = len(self.get_instances())
|
|
self.adjust(current_capacity, adjustment_type=EXACT_CAPACITY)
|
|
|
|
def adjust(self, adjustment, adjustment_type=CHANGE_IN_CAPACITY):
|
|
"""
|
|
Adjust the size of the scaling group if the cooldown permits.
|
|
"""
|
|
if self._cooldown_inprogress():
|
|
LOG.info(_("%(name)s NOT performing scaling adjustment, "
|
|
"cooldown %(cooldown)s")
|
|
% {'name': self.name,
|
|
'cooldown': self.properties[self.COOLDOWN]})
|
|
return
|
|
|
|
capacity = len(self.get_instances())
|
|
lower = self.properties[self.MIN_SIZE]
|
|
upper = self.properties[self.MAX_SIZE]
|
|
|
|
new_capacity = _calculate_new_capacity(capacity, adjustment,
|
|
adjustment_type, lower, upper)
|
|
|
|
if new_capacity == capacity:
|
|
LOG.debug('no change in capacity %d' % capacity)
|
|
return
|
|
|
|
# send a notification before, on-error and on-success.
|
|
notif = {
|
|
'stack': self.stack,
|
|
'adjustment': adjustment,
|
|
'adjustment_type': adjustment_type,
|
|
'capacity': capacity,
|
|
'groupname': self.FnGetRefId(),
|
|
'message': _("Start resizing the group %(group)s") % {
|
|
'group': self.FnGetRefId()},
|
|
'suffix': 'start',
|
|
}
|
|
notification.send(**notif)
|
|
try:
|
|
self.resize(new_capacity)
|
|
except Exception as resize_ex:
|
|
with excutils.save_and_reraise_exception():
|
|
try:
|
|
notif.update({'suffix': 'error',
|
|
'message': six.text_type(resize_ex),
|
|
})
|
|
notification.send(**notif)
|
|
except Exception:
|
|
LOG.exception(_('Failed sending error notification'))
|
|
else:
|
|
notif.update({
|
|
'suffix': 'end',
|
|
'capacity': new_capacity,
|
|
'message': _("End resizing the group %(group)s") % {
|
|
'group': notif['groupname']},
|
|
})
|
|
notification.send(**notif)
|
|
|
|
self._cooldown_timestamp("%s : %s" % (adjustment_type, adjustment))
|
|
|
|
def _tags(self):
|
|
"""Add Identifing Tags to all servers in the group.
|
|
|
|
This is so the Dimensions received from cfn-push-stats all include
|
|
the groupname and stack id.
|
|
Note: the group name must match what is returned from FnGetRefId
|
|
"""
|
|
autoscaling_tag = [{self.TAG_KEY: 'AutoScalingGroupName',
|
|
self.TAG_VALUE: self.FnGetRefId()}]
|
|
return super(AutoScalingGroup, self)._tags() + autoscaling_tag
|
|
|
|
def validate(self):
|
|
res = super(AutoScalingGroup, self).validate()
|
|
if res:
|
|
return res
|
|
|
|
# check validity of group size
|
|
min_size = self.properties[self.MIN_SIZE]
|
|
max_size = self.properties[self.MAX_SIZE]
|
|
|
|
if max_size < min_size:
|
|
msg = _("MinSize can not be greater than MaxSize")
|
|
raise exception.StackValidationFailed(message=msg)
|
|
|
|
if min_size < 0:
|
|
msg = _("The size of AutoScalingGroup can not be less than zero")
|
|
raise exception.StackValidationFailed(message=msg)
|
|
|
|
if self.properties[self.DESIRED_CAPACITY] is not None:
|
|
desired_capacity = self.properties[self.DESIRED_CAPACITY]
|
|
if desired_capacity < min_size or desired_capacity > max_size:
|
|
msg = _("DesiredCapacity must be between MinSize and MaxSize")
|
|
raise exception.StackValidationFailed(message=msg)
|
|
|
|
# TODO(pasquier-s): once Neutron is able to assign subnets to
|
|
# availability zones, it will be possible to specify multiple subnets.
|
|
# For now, only one subnet can be specified. The bug #1096017 tracks
|
|
# this issue.
|
|
if self.properties.get(self.VPCZONE_IDENTIFIER) and \
|
|
len(self.properties[self.VPCZONE_IDENTIFIER]) != 1:
|
|
raise exception.NotSupported(feature=_("Anything other than one "
|
|
"VPCZoneIdentifier"))
|
|
|
|
def child_template(self):
|
|
if self.properties[self.DESIRED_CAPACITY]:
|
|
num_instances = self.properties[self.DESIRED_CAPACITY]
|
|
else:
|
|
num_instances = self.properties[self.MIN_SIZE]
|
|
return self._create_template(num_instances)
|
|
|
|
|
|
class AutoScalingResourceGroup(AutoScalingGroup):
|
|
"""An autoscaling group that can scale arbitrary resources."""
|
|
|
|
PROPERTIES = (
|
|
RESOURCE, MAX_SIZE, MIN_SIZE, COOLDOWN, DESIRED_CAPACITY,
|
|
ROLLING_UPDATES,
|
|
) = (
|
|
'resource', 'max_size', 'min_size', 'cooldown', 'desired_capacity',
|
|
'rolling_updates',
|
|
)
|
|
|
|
_ROLLING_UPDATES_SCHEMA = (
|
|
MIN_IN_SERVICE, MAX_BATCH_SIZE, PAUSE_TIME,
|
|
) = (
|
|
'min_in_service', 'max_batch_size', 'pause_time',
|
|
)
|
|
|
|
ATTRIBUTES = (
|
|
OUTPUTS, OUTPUTS_LIST,
|
|
) = (
|
|
'outputs', 'outputs_list',
|
|
)
|
|
|
|
properties_schema = {
|
|
RESOURCE: properties.Schema(
|
|
properties.Schema.MAP,
|
|
_('Resource definition for the resources in the group, in HOT '
|
|
'format. The value of this property is the definition of a '
|
|
'resource just as if it had been declared in the template '
|
|
'itself.'),
|
|
required=True,
|
|
update_allowed=True,
|
|
),
|
|
MAX_SIZE: properties.Schema(
|
|
properties.Schema.INTEGER,
|
|
_('Maximum number of resources in the group.'),
|
|
required=True,
|
|
update_allowed=True,
|
|
constraints=[constraints.Range(min=0)],
|
|
),
|
|
MIN_SIZE: properties.Schema(
|
|
properties.Schema.INTEGER,
|
|
_('Minimum number of resources in the group.'),
|
|
required=True,
|
|
update_allowed=True,
|
|
constraints=[constraints.Range(min=0)]
|
|
),
|
|
COOLDOWN: properties.Schema(
|
|
properties.Schema.INTEGER,
|
|
_('Cooldown period, in seconds.'),
|
|
update_allowed=True
|
|
),
|
|
DESIRED_CAPACITY: properties.Schema(
|
|
properties.Schema.INTEGER,
|
|
_('Desired initial number of resources.'),
|
|
update_allowed=True
|
|
),
|
|
ROLLING_UPDATES: properties.Schema(
|
|
properties.Schema.MAP,
|
|
_('Policy for rolling updates for this scaling group.'),
|
|
required=False,
|
|
update_allowed=True,
|
|
schema={
|
|
MIN_IN_SERVICE: properties.Schema(
|
|
properties.Schema.NUMBER,
|
|
_('The minimum number of resources in service while '
|
|
'rolling updates are being executed.'),
|
|
constraints=[constraints.Range(min=0)],
|
|
default=0),
|
|
MAX_BATCH_SIZE: properties.Schema(
|
|
properties.Schema.NUMBER,
|
|
_('The maximum number of resources to replace at once.'),
|
|
constraints=[constraints.Range(min=0)],
|
|
default=1),
|
|
PAUSE_TIME: properties.Schema(
|
|
properties.Schema.NUMBER,
|
|
_('The number of seconds to wait between batches of '
|
|
'updates.'),
|
|
constraints=[constraints.Range(min=0)],
|
|
default=0),
|
|
},
|
|
),
|
|
}
|
|
|
|
attributes_schema = {
|
|
OUTPUTS: attributes.Schema(
|
|
_("A map of resource names to the specified attribute of each "
|
|
"individual resource.")
|
|
),
|
|
OUTPUTS_LIST: attributes.Schema(
|
|
_("A list of the specified attribute of each individual resource.")
|
|
),
|
|
}
|
|
|
|
def _get_instance_definition(self):
|
|
rsrc = self.properties[self.RESOURCE]
|
|
return rsrc_defn.ResourceDefinition(None,
|
|
rsrc['type'],
|
|
rsrc.get('properties'),
|
|
rsrc.get('metadata'))
|
|
|
|
def _lb_reload(self, exclude=None):
|
|
"""AutoScalingResourceGroup does not maintain load balancer
|
|
connections, so we just ignore calls to update the LB.
|
|
"""
|
|
pass
|
|
|
|
def _try_rolling_update(self, prop_diff):
|
|
if (self.properties[self.ROLLING_UPDATES] and
|
|
self.RESOURCE in prop_diff):
|
|
policy = self.properties[self.ROLLING_UPDATES]
|
|
self._replace(policy[self.MIN_IN_SERVICE],
|
|
policy[self.MAX_BATCH_SIZE],
|
|
policy[self.PAUSE_TIME])
|
|
|
|
def _create_template(self, num_instances, num_replace=0,
|
|
template_version=('heat_template_version',
|
|
'2013-05-23')):
|
|
"""Create a template in the HOT format for the nested stack."""
|
|
return super(AutoScalingResourceGroup,
|
|
self)._create_template(num_instances, num_replace,
|
|
template_version=template_version)
|
|
|
|
def FnGetAtt(self, key, *path):
|
|
if path:
|
|
attrs = ((rsrc.name,
|
|
rsrc.FnGetAtt(*path)) for rsrc in self.get_instances())
|
|
if key == self.OUTPUTS:
|
|
return dict(attrs)
|
|
if key == self.OUTPUTS_LIST:
|
|
return [value for name, value in attrs]
|
|
|
|
raise exception.InvalidTemplateAttribute(resource=self.name,
|
|
key=key)
|
|
|
|
|
|
def resource_mapping():
|
|
return {
|
|
'AWS::AutoScaling::AutoScalingGroup': AutoScalingGroup,
|
|
'OS::Heat::InstanceGroup': InstanceGroup,
|
|
'OS::Heat::AutoScalingGroup': AutoScalingResourceGroup,
|
|
}
|