115 lines
3.6 KiB
Python
115 lines
3.6 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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from oslo_log import log as logging
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import six
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from heat.common.i18n import _
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from heat.common.i18n import _LI
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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 properties
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from heat.engine.resources import signal_responder
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from heat.engine import support
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LOG = logging.getLogger(__name__)
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class Restarter(signal_responder.SignalResponder):
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support_status = support.SupportStatus(
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support.DEPRECATED,
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_('The HARestarter resource type is unsupported and will be removed '
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'in a future release of Heat, once it has support for auto-healing '
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'any type of resource. Note that HARestarter does *not* actually '
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'restart servers - it deletes and then recreates them. It also does '
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'the same to all dependent resources, and may therefore exhibit '
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'unexpected and undesirable behaviour. Avoid.')
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)
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PROPERTIES = (
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INSTANCE_ID,
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) = (
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'InstanceId',
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)
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ATTRIBUTES = (
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ALARM_URL,
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) = (
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'AlarmUrl',
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)
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properties_schema = {
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INSTANCE_ID: properties.Schema(
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properties.Schema.STRING,
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_('Instance ID to be restarted.'),
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required=True,
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constraints=[
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constraints.CustomConstraint('nova.server')
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]
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),
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}
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attributes_schema = {
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ALARM_URL: attributes.Schema(
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_("A signed url to handle the alarm (Heat extension).")
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),
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}
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def handle_create(self):
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super(Restarter, self).handle_create()
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self.resource_id_set(self._get_user_id())
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def handle_signal(self, details=None):
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if self.action in (self.SUSPEND, self.DELETE):
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msg = _('Cannot signal resource during %s') % self.action
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raise Exception(msg)
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if details is None:
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alarm_state = 'alarm'
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else:
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alarm_state = details.get('state', 'alarm').lower()
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LOG.info(_LI('%(name)s Alarm, new state %(state)s'),
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{'name': self.name, 'state': alarm_state})
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if alarm_state != 'alarm':
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return
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target_id = self.properties[self.INSTANCE_ID]
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victim = self.stack.resource_by_refid(target_id)
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if victim is None:
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LOG.info(_LI('%(name)s Alarm, can not find instance '
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'%(instance)s'),
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{'name': self.name,
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'instance': target_id})
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return
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LOG.info(_LI('%(name)s Alarm, restarting resource: %(victim)s'),
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{'name': self.name, 'victim': victim.name})
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self.stack.restart_resource(victim.name)
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def _resolve_attribute(self, name):
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'''
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heat extension: "AlarmUrl" returns the url to post to the policy
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when there is an alarm.
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'''
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if name == self.ALARM_URL and self.resource_id is not None:
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return six.text_type(self._get_signed_url())
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def resource_mapping():
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return {
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'OS::Heat::HARestarter': Restarter,
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}
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