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fb4cdc475f
While thinking through issues that might cause #25718 I ran into this case-- where you can create 2 sync wrappers with the same parent IOLoop and run into problems because you can't start/stop the loop multiple times like that and have the call tree work correctly. To solve this (since it *should* be the exceptional case) I'm making SyncWrapper keep track of which loops are in use-- then if someone attempts this situation it will simply make another one.
79 lines
2.0 KiB
Python
79 lines
2.0 KiB
Python
# coding: utf-8
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# Import Python Libs
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from __future__ import absolute_import
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# Import 3rd-party libs
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import tornado.testing
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import tornado.gen
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from tornado.testing import AsyncTestCase
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from salt.utils import async
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class HelperA(object):
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def __init__(self, io_loop=None):
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pass
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@tornado.gen.coroutine
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def sleep(self):
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yield tornado.gen.sleep(0.5)
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raise tornado.gen.Return(True)
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class HelperB(object):
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def __init__(self, a=None, io_loop=None):
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if a is None:
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a = async.SyncWrapper(HelperA)
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self.a = a
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@tornado.gen.coroutine
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def sleep(self):
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yield tornado.gen.sleep(0.5)
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self.a.sleep()
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raise tornado.gen.Return(False)
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class TestSyncWrapper(AsyncTestCase):
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@tornado.testing.gen_test
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def test_helpers(self):
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'''
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Test that the helper classes do what we expect within a regular async env
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'''
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ha = HelperA()
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ret = yield ha.sleep()
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self.assertTrue(ret)
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hb = HelperB()
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ret = yield hb.sleep()
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self.assertFalse(ret)
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def test_basic_wrap(self):
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'''
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Test that we can wrap an async caller.
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'''
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sync = async.SyncWrapper(HelperA)
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ret = sync.sleep()
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self.assertTrue(ret)
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def test_double(self):
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'''
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Test when the async wrapper object itself creates a wrap of another thing
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This works fine since the second wrap is based on the first's IOLoop so we
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don't have to worry about complex start/stop mechanics
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'''
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sync = async.SyncWrapper(HelperB)
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ret = sync.sleep()
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self.assertFalse(ret)
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def test_double_sameloop(self):
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'''
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Test async wrappers initiated from the same IOLoop, to ensure that
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we don't wire up both to the same IOLoop (since it causes MANY problems).
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'''
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a = async.SyncWrapper(HelperA)
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sync = async.SyncWrapper(HelperB, (a,))
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ret = sync.sleep()
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self.assertFalse(ret)
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