146 lines
5.9 KiB
Python
146 lines
5.9 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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from oslo_config import cfg
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from oslo_log import log
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from oslo_service import service as os_service
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import six
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from ceilometer.i18n import _LE, _LI
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from ceilometer import pipeline
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LOG = log.getLogger(__name__)
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@six.add_metaclass(abc.ABCMeta)
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class BaseService(os_service.Service):
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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 cfg.CONF.refresh_pipeline_cfg:
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self.set_pipeline_mtime(pipeline.get_pipeline_mtime())
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self.set_pipeline_hash(pipeline.get_pipeline_hash())
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if cfg.CONF.refresh_event_pipeline_cfg:
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self.set_pipeline_mtime(pipeline.get_pipeline_mtime(
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pipeline.EVENT_TYPE), pipeline.EVENT_TYPE)
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self.set_pipeline_hash(pipeline.get_pipeline_hash(
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pipeline.EVENT_TYPE), pipeline.EVENT_TYPE)
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if (cfg.CONF.refresh_pipeline_cfg or
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cfg.CONF.refresh_event_pipeline_cfg):
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self.tg.add_timer(cfg.CONF.pipeline_polling_interval,
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self.refresh_pipeline)
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def get_pipeline_mtime(self, p_type=pipeline.SAMPLE_TYPE):
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return (self.event_pipeline_mtime if p_type == pipeline.EVENT_TYPE else
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self.pipeline_mtime)
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def set_pipeline_mtime(self, mtime, p_type=pipeline.SAMPLE_TYPE):
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if p_type == pipeline.EVENT_TYPE:
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self.event_pipeline_mtime = mtime
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else:
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self.pipeline_mtime = mtime
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def get_pipeline_hash(self, p_type=pipeline.SAMPLE_TYPE):
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return (self.event_pipeline_hash if p_type == pipeline.EVENT_TYPE else
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self.pipeline_hash)
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def set_pipeline_hash(self, _hash, p_type=pipeline.SAMPLE_TYPE):
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if p_type == pipeline.EVENT_TYPE:
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self.event_pipeline_hash = _hash
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else:
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self.pipeline_hash = _hash
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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 pipeline_changed(self, p_type=pipeline.SAMPLE_TYPE):
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"""Returns hash of changed pipeline else False."""
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pipeline_mtime = self.get_pipeline_mtime(p_type)
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mtime = pipeline.get_pipeline_mtime(p_type)
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if mtime > pipeline_mtime:
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LOG.info(_LI('Pipeline configuration file has been updated.'))
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self.set_pipeline_mtime(mtime, p_type)
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_hash = pipeline.get_pipeline_hash(p_type)
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pipeline_hash = self.get_pipeline_hash(p_type)
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if _hash != pipeline_hash:
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LOG.info(_LI("Detected change in pipeline configuration."))
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return _hash
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return False
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def refresh_pipeline(self):
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"""Refreshes appropriate pipeline, then delegates to agent."""
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if cfg.CONF.refresh_pipeline_cfg:
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pipeline_hash = self.pipeline_changed()
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if pipeline_hash:
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try:
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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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# 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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LOG.debug("Pipeline has been refreshed. "
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"old hash: %(old)s, new hash: %(new)s",
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{'old': self.pipeline_hash,
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'new': pipeline_hash})
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self.set_pipeline_hash(pipeline_hash)
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self.pipeline_validated = True
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except Exception as err:
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LOG.debug("Active pipeline config's hash is %s",
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self.pipeline_hash)
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LOG.exception(_LE('Unable to load changed pipeline: %s')
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% err)
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if cfg.CONF.refresh_event_pipeline_cfg:
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ev_pipeline_hash = self.pipeline_changed(pipeline.EVENT_TYPE)
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if ev_pipeline_hash:
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try:
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# Pipeline in the notification agent.
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if hasattr(self, 'event_pipeline_manager'):
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self.event_pipeline_manager = (pipeline.
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setup_event_pipeline())
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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': self.event_pipeline_hash,
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'new': ev_pipeline_hash})
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self.set_pipeline_hash(ev_pipeline_hash,
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pipeline.EVENT_TYPE)
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self.event_pipeline_validated = True
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except Exception as err:
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LOG.debug("Active event pipeline config's hash is %s",
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self.event_pipeline_hash)
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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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