61 lines
2.1 KiB
Python
61 lines
2.1 KiB
Python
# Copyright 2016 Mirantis, Inc.
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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 re
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from oslo_messaging._drivers import common as rpc_common
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from oslo_messaging._i18n import _
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# current driver's version for representing internal message format
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MESSAGE_VERSION = '1.0'
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class UnsupportedMessageVersionError(rpc_common.RPCException):
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msg_fmt = _("Message version %(version)s is not supported.")
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def __init__(self, version):
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super(UnsupportedMessageVersionError, self).__init__(version=version)
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def get_method_versions(obj, method_name):
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"""Useful function for initializing versioned senders/receivers.
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Returns a dictionary of different internal versions of the given method.
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Assumes that the object has the particular versioned method and this method
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is public. Thus versions are private implementations of the method.
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For example, for a method 'func' methods '_func_v_1_0', '_func_v_1_5',
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'_func_v_2_0', etc. are assumed as its respective 1.0, 1.5, 2.0 versions.
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"""
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assert callable(getattr(obj, method_name, None)), \
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"Object must have specified method!"
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assert not method_name.startswith('_'), "Method must be public!"
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method_versions = {}
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for attr_name in dir(obj):
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if attr_name == method_name:
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continue
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attr = getattr(obj, attr_name, None)
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if not callable(attr):
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continue
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match_obj = re.match(r'^_%s_v_(\d)_(\d)$' % method_name, attr_name)
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if match_obj is not None:
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version = '.'.join([match_obj.group(1), match_obj.group(2)])
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method_versions[version] = attr
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return method_versions
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