144 lines
5.4 KiB
Python
144 lines
5.4 KiB
Python
# Copyright 2015 Red Hat, Inc.
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# All Rights Reserved.
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#
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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 collections
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import logging
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import os
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from heatclient.common import template_utils
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from tripleo_common import constants
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from tripleo_common import update
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LOG = logging.getLogger(__name__)
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def get_group_resources_after_delete(groupname, res_to_delete, resources):
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group = next(res for res in resources if
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res.resource_name == groupname and
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res.resource_type == constants.RESOURCE_GROUP_TYPE)
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members = []
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for res in resources:
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stack_name, stack_id = next(
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x['href'] for x in res.links if
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x['rel'] == 'stack').rsplit('/', 2)[1:]
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# desired new count of nodes after delete operation should be
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# count of all existing nodes in ResourceGroup which are not
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# in set of nodes being deleted. Also nodes in any delete state
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# from a previous failed update operation are not included in
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# overall count (if such nodes exist)
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if (stack_id == group.physical_resource_id and
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res not in res_to_delete and
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not res.resource_status.startswith('DELETE')):
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members.append(res)
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return members
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class ScaleManager(object):
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def __init__(self, heatclient, stack_id, tht_dir=None,
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environment_files=None):
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self.heatclient = heatclient
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self.stack_id = stack_id
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self.tht_dir = tht_dir
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self.environment_files = environment_files
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def scaledown(self, instances):
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resources = self.heatclient.resources.list(self.stack_id,
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nested_depth=5)
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resources_by_role = collections.defaultdict(list)
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instance_list = list(instances)
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for res in resources:
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try:
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instance_list.remove(res.physical_resource_id)
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except ValueError:
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continue
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stack_name, stack_id = next(
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x['href'] for x in res.links if
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x['rel'] == 'stack').rsplit('/', 2)[1:]
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# get resource to remove from resource group (it's parent resource
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# of nova server)
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role_resource = next(x for x in resources if
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x.physical_resource_id == stack_id)
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# get the role name which is parent resource name in Heat
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role = role_resource.parent_resource
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resources_by_role[role].append(role_resource)
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resources_by_role = dict(resources_by_role)
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if instance_list:
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raise ValueError(
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"Couldn't find following instances in stack %s: %s" %
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(self.stack_id, ','.join(instance_list)))
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# decrease count for each role (or resource group) and set removal
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# policy for each resource group
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stack_params = self._get_removal_params_from_heat(
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resources_by_role, resources)
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self._update_stack(parameters=stack_params)
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def _update_stack(self, parameters={},
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timeout_mins=constants.STACK_TIMEOUT_DEFAULT):
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tpl_files, template = template_utils.get_template_contents(
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template_file=os.path.join(self.tht_dir, constants.TEMPLATE_NAME))
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env_paths = []
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if self.environment_files:
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env_paths.extend(self.environment_files)
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env_files, env = (
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template_utils.process_multiple_environments_and_files(
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env_paths=env_paths))
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update.add_breakpoints_cleanup_into_env(env)
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fields = {
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'existing': True,
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'stack_id': self.stack_id,
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'template': template,
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'files': dict(list(tpl_files.items()) +
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list(env_files.items())),
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'environment': env,
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'parameters': parameters,
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'timeout_mins': timeout_mins
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}
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LOG.debug('stack update params: %s', fields)
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self.heatclient.stacks.update(**fields)
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def _get_removal_params_from_heat(self, resources_by_role, resources):
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stack_params = {}
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for role, role_resources in resources_by_role.items():
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param_name = "{0}Count".format(role)
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# get real count of nodes for each role. *Count stack parameters
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# can not be used because stack parameters return parameters
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# passed by user no matter if previous update operation succeeded
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# or not
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group_members = get_group_resources_after_delete(
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role, role_resources, resources)
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stack_params[param_name] = str(len(group_members))
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# add instance resource names into removal_policies
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# so heat knows which instances should be removed
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removal_param = "{0}RemovalPolicies".format(role)
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stack_params[removal_param] = [{
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'resource_list': [r.resource_name for r in role_resources]
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}]
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return stack_params
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