OpenStack Orchestration (Heat)
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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.
import collections
from oslo_log import log as logging
import six
from heat.common import exception
from heat.common.i18n import _
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 _get_ec2_signed_url(self, signal_type=signal_responder.WAITCONDITION):
stored = self.data().get('ec2_signed_url')
if stored is not None:
return stored
url = super(BaseWaitConditionHandle,
self)._get_ec2_signed_url(signal_type)
self.data_set('ec2_signed_url', url)
return url
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 not isinstance(metadata, collections.Mapping):
return False
if set(metadata) != set(self.METADATA_KEYS):
return False
return self._status_ok(metadata[self.STATUS])
def normalise_signal_data(self, signal_data, latest_metadata):
return signal_data
def handle_signal(self, details=None):
write_attempts = []
def merge_signal_metadata(signal_data, latest_rsrc_metadata):
signal_data = self.normalise_signal_data(signal_data,
latest_rsrc_metadata)
if not self._metadata_format_ok(signal_data):
LOG.info("Metadata failed validation for %s", self.name)
raise ValueError(_("Metadata format invalid"))
new_entry = signal_data.copy()
unique_id = six.text_type(new_entry.pop(self.UNIQUE_ID))
new_rsrc_metadata = latest_rsrc_metadata.copy()
if unique_id in new_rsrc_metadata:
LOG.info("Overwriting Metadata item for id %s!",
unique_id)
new_rsrc_metadata.update({unique_id: new_entry})
write_attempts.append(signal_data)
return new_rsrc_metadata
self.metadata_set(details, merge_metadata=merge_signal_metadata)
data_written = write_attempts[-1]
signal_reason = ('status:%s reason:%s' %
(data_written[self.STATUS],
data_written[self.REASON]))
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 six.itervalues(self.metadata_get(refresh=True))]
def get_status_reason(self, status):
"""Return a list of reasons associated with a particular status."""
return [v[self.REASON]
for v in six.itervalues(self.metadata_get(refresh=True))
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)