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#
# 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 oslo_log import log as logging
from heat.common import exception
from heat.common.i18n import _
from heat.common.i18n import _LE
from heat.common.i18n import _LW
from heat.engine.resources import signal_responder
LOG = logging.getLogger(__name__)
class BaseWaitConditionHandle(signal_responder.SignalResponder):
'''
Base WaitConditionHandle resource.
The main point of this class is to :
- have no dependencies (so the instance can reference it)
- create credentials to allow for signalling from the instance.
- handle signals from the instance, validate and store result
'''
properties_schema = {}
WAIT_STATUSES = (
STATUS_FAILURE,
STATUS_SUCCESS,
) = (
'FAILURE',
'SUCCESS',
)
def handle_create(self):
super(BaseWaitConditionHandle, self).handle_create()
self.resource_id_set(self._get_user_id())
def _status_ok(self, status):
return status in self.WAIT_STATUSES
def _metadata_format_ok(self, metadata):
if sorted(tuple(metadata.keys())) == sorted(self.METADATA_KEYS):
return self._status_ok(metadata[self.STATUS])
def handle_signal(self, metadata=None):
signal_reason = None
if self._metadata_format_ok(metadata):
rsrc_metadata = self.metadata_get(refresh=True)
if metadata[self.UNIQUE_ID] in rsrc_metadata:
LOG.warn(_LW("Overwriting Metadata item for id %s!"),
metadata[self.UNIQUE_ID])
safe_metadata = {}
for k in self.METADATA_KEYS:
if k == self.UNIQUE_ID:
continue
safe_metadata[k] = metadata[k]
rsrc_metadata.update({metadata[self.UNIQUE_ID]: safe_metadata})
self.metadata_set(rsrc_metadata)
signal_reason = ('status:%s reason:%s' %
(safe_metadata[self.STATUS],
safe_metadata[self.REASON]))
else:
LOG.error(_LE("Metadata failed validation for %s"), self.name)
raise ValueError(_("Metadata format invalid"))
return signal_reason
def get_status(self):
'''
Return a list of the Status values for the handle signals
'''
return [v[self.STATUS]
for v in self.metadata_get(refresh=True).values()]
def get_status_reason(self, status):
'''
Return a list of reasons associated with a particular status
'''
return [v[self.REASON]
for v in self.metadata_get(refresh=True).values()
if v[self.STATUS] == status]
class WaitConditionFailure(exception.Error):
def __init__(self, wait_condition, handle):
reasons = handle.get_status_reason(handle.STATUS_FAILURE)
super(WaitConditionFailure, self).__init__(';'.join(reasons))
class WaitConditionTimeout(exception.Error):
def __init__(self, wait_condition, handle):
reasons = handle.get_status_reason(handle.STATUS_SUCCESS)
vals = {'len': len(reasons),
'count': wait_condition.properties[wait_condition.COUNT]}
if reasons:
vals['reasons'] = ';'.join(reasons)
message = (_('%(len)d of %(count)d received - %(reasons)s') % vals)
else:
message = (_('%(len)d of %(count)d received') % vals)
super(WaitConditionTimeout, self).__init__(message)
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