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