130 lines
4.3 KiB
Python
130 lines
4.3 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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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 eventlet
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import json
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from heat.common import exception
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from heat.engine import resources
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from heat.openstack.common import log as logging
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logger = logging.getLogger('heat.engine.wait_condition')
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class WaitConditionHandle(resources.Resource):
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'''
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the main point of this class is to :
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have no dependancies (so the instance can reference it)
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generate a unique url (to be returned in the refernce)
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then the cfn-signal will use this url to post to and
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WaitCondition will poll it to see if has been written to.
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'''
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properties_schema = {}
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def __init__(self, name, json_snippet, stack):
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super(WaitConditionHandle, self).__init__(name, json_snippet, stack)
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def handle_create(self):
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self.instance_id = '%s/stacks/%s/resources/%s' % \
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(resources.Metadata.server(),
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self.stack.id,
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self.name)
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WAIT_STATUSES = (
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WAITING,
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TIMEDOUT,
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SUCCESS,
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) = (
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'WAITING',
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'TIMEDOUT',
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'SUCCESS',
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)
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class WaitCondition(resources.Resource):
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properties_schema = {'Handle': {'Type': 'String',
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'Required': True},
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'Timeout': {'Type': 'Number',
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'Required': True,
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'MinValue': '1'},
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'Count': {'Type': 'Number',
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'MinValue': '1'}}
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def __init__(self, name, json_snippet, stack):
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super(WaitCondition, self).__init__(name, json_snippet, stack)
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self.resource_id = None
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self.timeout = int(self.t['Properties']['Timeout'])
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self.count = int(self.t['Properties'].get('Count', '1'))
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def _get_handle_resource_id(self):
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if self.resource_id is None:
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self.calculate_properties()
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handle_url = self.properties['Handle']
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self.resource_id = handle_url.split('/')[-1]
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return self.resource_id
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def handle_create(self):
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tmo = None
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try:
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# keep polling our Metadata to see if the cfn-signal has written
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# it yet. The execution here is limited by timeout.
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with eventlet.Timeout(self.timeout) as tmo:
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handle = self.stack[self._get_handle_resource_id()]
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status = WAITING
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reason = ''
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sleep_time = 1
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while status == WAITING:
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meta = handle.metadata
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status = meta.get('Status', WAITING)
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reason = meta.get('Reason', 'Reason not provided')
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logger.debug('got %s' % json.dumps(meta))
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if status == WAITING:
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logger.debug('Waiting for the Metadata[Status]')
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eventlet.sleep(sleep_time)
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sleep_time = min(sleep_time * 2, self.timeout / 4)
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except eventlet.Timeout as t:
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if t is not tmo:
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# not my timeout
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raise
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else:
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status = TIMEDOUT
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reason = 'Timed out waiting for instance'
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if status != SUCCESS:
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raise exception.Error(reason)
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def FnGetAtt(self, key):
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res = None
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if key == 'Data':
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try:
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meta = self.metadata
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if meta and 'Data' in meta:
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res = meta['Data']
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except Exception as ex:
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pass
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else:
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raise exception.InvalidTemplateAttribute(resource=self.name,
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key=key)
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logger.debug('%s.GetAtt(%s) == %s' % (self.name, key, res))
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return unicode(res)
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