ecce97fd03
This patch plumbs storage drivers so they all get a cache instance they can use at their discretion. I decided to make cache a required param to the initializers, since any deployment of Marconi of any significance would likely opt to enable caching anyway, and the cache library has a default in-memory backend that can be used for simple deployments. Note also that both data- and control-plane drivers receive a cache instance, even though the sharding controllers will not use it (caching will be done in the sharding data driver instead.) I thought it would be better to pass cache in both cases so we can share test code and avoid complicating utils.load_storage_driver(). Also, the control driver may eventually support operations other than sharding; cache may come in handy then. Change-Id: I647791af0d7a5914c30cb2489033ec650a455370 Signed-off-by: kgriffs <kurt.griffiths@rackspace.com>
116 lines
4.0 KiB
Python
116 lines
4.0 KiB
Python
# Copyright (c) 2013 Rackspace, Inc.
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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 oslo.config import cfg
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from stevedore import driver
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from marconi.common.cache import cache as oslo_cache
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from marconi.common import decorators
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from marconi.common import errors
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from marconi.openstack.common import log
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from marconi.queues.storage import pipeline
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from marconi.queues.storage import sharding
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from marconi.queues.storage import utils as storage_utils
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from marconi.queues import transport # NOQA
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LOG = log.getLogger(__name__)
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_GENERAL_OPTIONS = [
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cfg.BoolOpt('sharding', default=False,
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help=('Enable sharding across multiple storage backends. ',
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'If sharding is enabled, the storage driver ',
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'configuration is used to determine where the ',
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'catalogue/control plane data is kept.')),
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cfg.BoolOpt('admin_mode', default=False,
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help='Activate endpoints to manage shard registry.'),
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]
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_DRIVER_OPTIONS = [
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cfg.StrOpt('transport', default='wsgi',
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help='Transport driver to use'),
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cfg.StrOpt('storage', default='sqlite',
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help='Storage driver to use'),
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]
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_DRIVER_GROUP = 'drivers'
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class Bootstrap(object):
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"""Defines the Marconi bootstrapper.
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The bootstrap loads up drivers per a given configuration, and
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manages their lifetimes.
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"""
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def __init__(self, conf):
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self.conf = conf
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self.conf.register_opts(_GENERAL_OPTIONS)
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self.conf.register_opts(_DRIVER_OPTIONS, group=_DRIVER_GROUP)
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self.driver_conf = self.conf[_DRIVER_GROUP]
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log.setup('marconi')
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mode = 'admin' if conf.admin_mode else 'public'
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self._transport_type = 'marconi.queues.{0}.transport'.format(mode)
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@decorators.lazy_property(write=False)
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def storage(self):
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LOG.debug(_(u'Loading storage driver'))
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if self.conf.sharding:
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LOG.debug(_(u'Storage sharding enabled'))
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storage_driver = sharding.DataDriver(self.conf, self.cache,
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self.control)
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else:
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storage_driver = storage_utils.load_storage_driver(
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self.conf, self.cache)
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LOG.debug(_(u'Loading storage pipeline'))
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return pipeline.DataDriver(self.conf, storage_driver)
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@decorators.lazy_property(write=False)
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def control(self):
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LOG.debug(_(u'Loading storage control driver'))
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return storage_utils.load_storage_driver(self.conf, self.cache,
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control_mode=True)
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@decorators.lazy_property(write=False)
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def cache(self):
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LOG.debug(_(u'Loading proxy cache driver'))
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try:
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mgr = oslo_cache.get_cache(self.conf)
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return mgr
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except RuntimeError as exc:
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LOG.exception(exc)
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raise errors.InvalidDriver(exc)
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@decorators.lazy_property(write=False)
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def transport(self):
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transport_name = self.driver_conf.transport
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LOG.debug(_(u'Loading transport driver: %s'), transport_name)
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args = [self.conf, self.storage, self.cache, self.control]
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try:
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mgr = driver.DriverManager(self._transport_type,
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transport_name,
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invoke_on_load=True,
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invoke_args=args)
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return mgr.driver
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except RuntimeError as exc:
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LOG.exception(exc)
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raise errors.InvalidDriver(exc)
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def run(self):
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self.transport.listen()
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