42 lines
1.5 KiB
Python
42 lines
1.5 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2013 Rackspace Hosting Inc. All Rights Reserved.
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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 logging
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from six.moves import urllib_parse as urlparse # noqa
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from stevedore import driver
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from taskflow import exceptions as exc
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# NOTE(harlowja): this is the entrypoint namespace, not the module namespace.
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BACKEND_NAMESPACE = 'taskflow.persistence'
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LOG = logging.getLogger(__name__)
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def fetch(conf, namespace=BACKEND_NAMESPACE):
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backend_name = urlparse.urlparse(conf['connection']).scheme
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LOG.debug('Looking for %r backend driver in %r', backend_name, namespace)
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try:
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mgr = driver.DriverManager(namespace, backend_name,
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invoke_on_load=True,
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invoke_kwds={'conf': conf})
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return mgr.driver
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except RuntimeError as e:
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raise exc.NotFound("Could not find backend %s: %s" % (backend_name, e))
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