116 lines
3.7 KiB
Python
116 lines
3.7 KiB
Python
# (C) Copyright 2016 Hewlett Packard Enterprise Development Company LP
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# (C) Copyright 2017 SUSE LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from abc import ABCMeta
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import os
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from oslo_config import cfg
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from oslo_log import log
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import six
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from monasca_persister.repositories import singleton
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LOG = log.getLogger(__name__)
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class DataPoints(dict):
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def __init__(self):
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self.counter = 0
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def __setitem__(self, key, value):
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raise NotImplementedError('Use append(key, value) instead.')
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def __delitem__(self, key):
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raise NotImplementedError('Use clear() instead.')
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def pop(self):
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raise NotImplementedError('Use clear() instead.')
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def popitem(self):
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raise NotImplementedError('Use clear() instead.')
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def update(self):
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raise NotImplementedError('Use clear() instead.')
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def chained(self):
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return [vi for vo in super(DataPoints, self).values() for vi in vo]
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def append(self, key, value):
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super(DataPoints, self).setdefault(key, []).append(value)
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self.counter += 1
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def clear(self):
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super(DataPoints, self).clear()
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self.counter = 0
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@six.add_metaclass(singleton.Singleton)
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class Persister(six.with_metaclass(ABCMeta, object)):
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def __init__(self, kafka_conf, repository):
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self._data_points = DataPoints()
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self._kafka_topic = kafka_conf.topic
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self._batch_size = kafka_conf.batch_size
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self.repository = repository()
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def _flush(self):
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if not self._data_points:
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return
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try:
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self.repository.write_batch(self._data_points)
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LOG.info("Processed {} messages from topic '{}'".format(
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self._data_points.counter, self._kafka_topic))
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self._data_points.clear()
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self._consumer.commit()
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except Exception as ex:
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if "partial write: points beyond retention policy dropped" in str(ex):
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LOG.warning("Some points older than retention policy were dropped")
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self._data_points.clear()
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self._consumer.commit()
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elif cfg.CONF.repositories.ignore_parse_point_error \
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and "unable to parse" in str(ex):
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LOG.warning("Some points were unable to be parsed and were dropped")
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self._data_points.clear()
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self._consumer.commit()
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else:
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LOG.exception("Error writing to database: {}"
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.format(self._data_points))
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raise ex
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def run(self):
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try:
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for message in self._consumer:
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try:
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data_point, tenant_id = self.repository.process_message(message)
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self._data_points.append(tenant_id, data_point)
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except Exception:
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LOG.exception('Error processing message. Message is '
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'being dropped. {}'.format(message))
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if self._data_points.counter >= self._batch_size:
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self._flush()
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except Exception:
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LOG.exception(
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'Persister encountered fatal exception processing '
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'messages. '
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'Shutting down all threads and exiting')
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os._exit(1)
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