# -*- encoding: utf-8 -*-
# Copyright (c) 2015 b<>com
#
# Authors: Jean-Emile DARTOIS <jean-emile.dartois@b-com.com>
#
# 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.
#
from watcher._i18n import _
from watcher.applier.actions import base
from watcher.common import exception
from watcher.common import nova_helper
from watcher.decision_engine.model import element
[docs]class ChangeNovaServiceState(base.BaseAction):
"""Disables or enables the nova-compute service, deployed on a host
By using this action, you will be able to update the state of a
nova-compute service. A disabled nova-compute service can not be selected
by the nova scheduler for future deployment of server.
The action schema is::
schema = Schema({
'resource_id': str,
'state': str,
'disabled_reason': str,
})
The `resource_id` references a nova-compute service name (list of available
nova-compute services is returned by this command: ``nova service-list
--binary nova-compute``).
The `state` value should either be `ONLINE` or `OFFLINE`.
The `disabled_reason` references the reason why Watcher disables this
nova-compute service. The value should be with `watcher_` prefix, such as
`watcher_disabled`, `watcher_maintaining`.
"""
STATE = 'state'
REASON = 'disabled_reason'
@property
def schema(self):
return {
'type': 'object',
'properties': {
'resource_id': {
'type': 'string',
"minlength": 1
},
'state': {
'type': 'string',
'enum': [element.ServiceState.ONLINE.value,
element.ServiceState.OFFLINE.value,
element.ServiceState.ENABLED.value,
element.ServiceState.DISABLED.value]
},
'disabled_reason': {
'type': 'string',
"minlength": 1
}
},
'required': ['resource_id', 'state'],
'additionalProperties': False,
}
@property
def host(self):
return self.resource_id
@property
def state(self):
return self.input_parameters.get(self.STATE)
@property
def reason(self):
return self.input_parameters.get(self.REASON)
[docs] def execute(self):
target_state = None
if self.state == element.ServiceState.DISABLED.value:
target_state = False
elif self.state == element.ServiceState.ENABLED.value:
target_state = True
return self._nova_manage_service(target_state)
[docs] def revert(self):
target_state = None
if self.state == element.ServiceState.DISABLED.value:
target_state = True
elif self.state == element.ServiceState.ENABLED.value:
target_state = False
return self._nova_manage_service(target_state)
def _nova_manage_service(self, state):
if state is None:
raise exception.IllegalArgumentException(
message=_("The target state is not defined"))
nova = nova_helper.NovaHelper(osc=self.osc)
if state is True:
return nova.enable_service_nova_compute(self.host)
else:
return nova.disable_service_nova_compute(self.host, self.reason)
[docs] def get_description(self):
"""Description of the action"""
return ("Disables or enables the nova-compute service."
"A disabled nova-compute service can not be selected "
"by the nova for future deployment of new server.")
Except where otherwise noted, this document is licensed under Creative Commons Attribution 3.0 License. See all OpenStack Legal Documents.