83 lines
2.7 KiB
Python
83 lines
2.7 KiB
Python
#
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# Copyright 2012 New Dream Network, LLC (DreamHost)
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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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"""Storage backend management
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"""
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from oslo_config import cfg
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from oslo_db import options as db_options
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from oslo_log import log
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import retrying
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import six.moves.urllib.parse as urlparse
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from stevedore import driver
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LOG = log.getLogger(__name__)
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OPTS = [
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cfg.IntOpt('event_time_to_live',
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default=-1,
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help=("Number of seconds that events are kept "
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"in the database for (<= 0 means forever).")),
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cfg.StrOpt('event_connection',
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secret=True,
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help='The connection string used to connect to the event '
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'database. (if unset, connection is used)'),
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]
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cfg.CONF.register_opts(OPTS, group='database')
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db_options.set_defaults(cfg.CONF)
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class StorageUnknownWriteError(Exception):
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"""Error raised when an unknown error occurs while recording."""
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class StorageBadVersion(Exception):
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"""Error raised when the storage backend version is not good enough."""
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class StorageBadAggregate(Exception):
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"""Error raised when an aggregate is unacceptable to storage backend."""
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code = 400
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def get_connection_from_config(conf):
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retries = conf.database.max_retries
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# Convert retry_interval secs to msecs for retry decorator
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@retrying.retry(wait_fixed=conf.database.retry_interval * 1000,
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stop_max_attempt_number=retries if retries >= 0 else None)
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def _inner():
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url = (getattr(conf.database, 'event_connection') or
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conf.database.connection)
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return get_connection(url, conf)
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return _inner()
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def get_connection(url, conf):
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"""Return an open connection to the database."""
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connection_scheme = urlparse.urlparse(url).scheme
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# SqlAlchemy connections specify may specify a 'dialect' or
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# 'dialect+driver'. Handle the case where driver is specified.
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engine_name = connection_scheme.split('+')[0]
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# NOTE: translation not applied bug #1446983
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LOG.debug('looking for %(name)r driver in panko.event.storage',
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{'name': engine_name})
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mgr = driver.DriverManager('panko.event.storage', engine_name)
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return mgr.driver(url, conf)
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