70 lines
2.5 KiB
Python
70 lines
2.5 KiB
Python
# Copyright 2013 Red Hat, 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 sys
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import fixtures
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import oslo_messaging as messaging
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class CastAsCallFixture(fixtures.Fixture):
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"""Make RPC 'cast' behave like a 'call'.
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This is a little hack for tests that need to know when a cast
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operation has completed. The idea is that we wait for the RPC
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endpoint method to complete and return before continuing on the
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caller.
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See Ia7f40718533e450f00cd3e7d753ac65755c70588 for more background.
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"""
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def __init__(self, testcase):
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super().__init__()
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self.testcase = testcase
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@staticmethod
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def _stub_out(testcase, obj=None):
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if obj:
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orig_prepare = obj.prepare
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else:
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orig_prepare = messaging.RPCClient.prepare
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def prepare(self, *args, **kwargs):
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# Casts with fanout=True would throw errors if its monkeypatched to
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# the call method, so we must override fanout to False
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if 'fanout' in kwargs:
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kwargs['fanout'] = False
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cctxt = orig_prepare(self, *args, **kwargs)
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CastAsCallFixture._stub_out(testcase, cctxt) # woo, recurse!
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return cctxt
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if obj:
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cls = getattr(sys.modules[obj.__class__.__module__],
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obj.__class__.__name__)
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testcase.stub_out('%s.%s.prepare' % (obj.__class__.__module__,
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obj.__class__.__name__),
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prepare)
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testcase.stub_out('%s.%s.cast' % (obj.__class__.__module__,
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obj.__class__.__name__),
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cls.call)
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else:
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testcase.stub_out('oslo_messaging.RPCClient.prepare', prepare)
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testcase.stub_out('oslo_messaging.RPCClient.cast',
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messaging.RPCClient.call)
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def setUp(self):
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super().setUp()
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self._stub_out(self.testcase)
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