cb2ea424c7
Allow the uri passed to various entrypoints to itself contain most of the configuration for that entrypoint by using the RFC 3986 uri format to allow for additional parameters to be used in configuring and selecting those entrypoints. Also bring over network_utils from oslo since it provides a more compliant url splitting support. Part of blueprint persistence-uris Change-Id: I8e5d8584d2cac4f9b338fa155f220cdfd52bb7d9
52 lines
1.8 KiB
Python
52 lines
1.8 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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from stevedore import driver
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from taskflow import exceptions as exc
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from taskflow.utils import misc
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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, **kwargs):
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"""Fetches a given backend using the given configuration (and any backend
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specific kwargs) in the given entrypoint namespace.
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"""
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backend_name = conf['connection']
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try:
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pieces = misc.parse_uri(backend_name)
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except (TypeError, ValueError):
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pass
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else:
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backend_name = pieces['scheme']
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conf = misc.merge_uri(pieces, conf.copy())
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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_args=(conf,),
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invoke_kwds=kwargs)
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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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