106 lines
4.2 KiB
Python
106 lines
4.2 KiB
Python
#
|
|
# Copyright 2015 Hewlett Packard
|
|
#
|
|
# 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 abc
|
|
|
|
import cotyledon
|
|
from oslo_config import cfg
|
|
from oslo_log import log
|
|
import six
|
|
|
|
from ceilometer.i18n import _LE
|
|
from ceilometer import pipeline
|
|
from ceilometer import utils
|
|
|
|
LOG = log.getLogger(__name__)
|
|
|
|
|
|
@six.add_metaclass(abc.ABCMeta)
|
|
class PipelineBasedService(cotyledon.Service):
|
|
def clear_pipeline_validation_status(self):
|
|
"""Clears pipeline validation status flags."""
|
|
self.pipeline_validated = False
|
|
self.event_pipeline_validated = False
|
|
|
|
def init_pipeline_refresh(self):
|
|
"""Initializes pipeline refresh state."""
|
|
self.clear_pipeline_validation_status()
|
|
|
|
self.refresh_pipeline_periodic = None
|
|
if (cfg.CONF.refresh_pipeline_cfg or
|
|
cfg.CONF.refresh_event_pipeline_cfg):
|
|
self.refresh_pipeline_periodic = utils.create_periodic(
|
|
target=self.refresh_pipeline,
|
|
spacing=cfg.CONF.pipeline_polling_interval)
|
|
utils.spawn_thread(self.refresh_pipeline_periodic.start)
|
|
|
|
def terminate(self):
|
|
if self.refresh_pipeline_periodic:
|
|
self.refresh_pipeline_periodic.stop()
|
|
self.refresh_pipeline_periodic.wait()
|
|
|
|
@abc.abstractmethod
|
|
def reload_pipeline(self):
|
|
"""Reload pipeline in the agents."""
|
|
|
|
def refresh_pipeline(self):
|
|
"""Refreshes appropriate pipeline, then delegates to agent."""
|
|
|
|
if cfg.CONF.refresh_pipeline_cfg:
|
|
manager = None
|
|
if hasattr(self, 'pipeline_manager'):
|
|
manager = self.pipeline_manager
|
|
elif hasattr(self, 'polling_manager'):
|
|
manager = self.polling_manager
|
|
pipeline_hash = manager.cfg_changed() if manager else None
|
|
if pipeline_hash:
|
|
try:
|
|
LOG.debug("Pipeline has been refreshed. "
|
|
"old hash: %(old)s, new hash: %(new)s",
|
|
{'old': manager.cfg_hash,
|
|
'new': pipeline_hash})
|
|
# Pipeline in the notification agent.
|
|
if hasattr(self, 'pipeline_manager'):
|
|
self.pipeline_manager = pipeline.setup_pipeline()
|
|
# Polling in the polling agent.
|
|
elif hasattr(self, 'polling_manager'):
|
|
self.polling_manager = pipeline.setup_polling()
|
|
self.pipeline_validated = True
|
|
except Exception as err:
|
|
LOG.exception(_LE('Unable to load changed pipeline: %s')
|
|
% err)
|
|
|
|
if cfg.CONF.refresh_event_pipeline_cfg:
|
|
# Pipeline in the notification agent.
|
|
manager = (self.event_pipeline_manager
|
|
if hasattr(self, 'event_pipeline_manager') else None)
|
|
ev_pipeline_hash = manager.cfg_changed()
|
|
if ev_pipeline_hash:
|
|
try:
|
|
LOG.debug("Event Pipeline has been refreshed. "
|
|
"old hash: %(old)s, new hash: %(new)s",
|
|
{'old': manager.cfg_hash,
|
|
'new': ev_pipeline_hash})
|
|
self.event_pipeline_manager = (pipeline.
|
|
setup_event_pipeline())
|
|
self.event_pipeline_validated = True
|
|
except Exception as err:
|
|
LOG.exception(_LE('Unable to load changed event pipeline:'
|
|
' %s') % err)
|
|
|
|
if self.pipeline_validated or self.event_pipeline_validated:
|
|
self.reload_pipeline()
|
|
self.clear_pipeline_validation_status()
|