2807fa7c2e
Having to specify backend connection as URI is somewhat confusing when other parts of uri (like host or path) are not used. This commit allows to specify just backend name as connection string. Partially implements blueprint persistence-uris Change-Id: Ic38d41d4f24dcd596cbdff33de78d1a137fb2e8f
52 lines
1.7 KiB
Python
52 lines
1.7 KiB
Python
# -*- coding: utf-8 -*-
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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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import re
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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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# NOTE(imelnikov): regular expression to get scheme from URI,
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# see RFC 3986 section 3.1
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SCHEME_REGEX = re.compile(r"^([A-Za-z]{1}[A-Za-z0-9+.-]*):")
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LOG = logging.getLogger(__name__)
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def fetch(conf, namespace=BACKEND_NAMESPACE):
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connection = conf['connection']
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match = SCHEME_REGEX.match(connection)
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if match:
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backend_name = match.group(1)
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else:
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backend_name = connection
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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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