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# Copyright (c) 2018 gevent community # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # THE SOFTWARE. from __future__ import absolute_import, print_function, division import sys import functools import unittest from . import sysinfo from . import six class FlakyAssertionError(AssertionError): "Re-raised so that we know it's a known-flaky test." # The next exceptions allow us to raise them in a highly # greppable way so that we can debug them later. class FlakyTest(unittest.SkipTest): """ A unittest exception that causes the test to be skipped when raised. Use this carefully, it is a code smell and indicates an undebugged problem. """ class FlakyTestRaceCondition(FlakyTest): """ Use this when the flaky test is definitely caused by a race condition. """ class FlakyTestTimeout(FlakyTest): """ Use this when the flaky test is definitely caused by an unexpected timeout. """ class FlakyTestCrashes(FlakyTest): """ Use this when the test sometimes crashes. """ def reraiseFlakyTestRaceCondition(): six.reraise(FlakyAssertionError, FlakyAssertionError(sys.exc_info()[1]), sys.exc_info()[2]) reraiseFlakyTestTimeout = reraiseFlakyTestRaceCondition reraiseFlakyTestRaceConditionLibuv = reraiseFlakyTestRaceCondition reraiseFlakyTestTimeoutLibuv = reraiseFlakyTestRaceCondition if sysinfo.RUNNING_ON_CI or (sysinfo.PYPY and sysinfo.WIN): # pylint: disable=function-redefined def reraiseFlakyTestRaceCondition(): # Getting stack traces is incredibly expensive # in pypy on win, at least in test virtual machines. # It can take minutes. The traceback consistently looks like # the following when interrupted: # dump_stacks -> traceback.format_stack # -> traceback.extract_stack -> linecache.checkcache # -> os.stat -> _structseq.structseq_new # Moreover, without overriding __repr__ or __str__, # the msg doesn't get printed like we would want (its basically # unreadable, all printed on one line). So skip that. #msg = '\n'.join(dump_stacks()) msg = str(sys.exc_info()[1]) six.reraise(FlakyTestRaceCondition, FlakyTestRaceCondition(msg), sys.exc_info()[2]) def reraiseFlakyTestTimeout(): msg = str(sys.exc_info()[1]) six.reraise(FlakyTestTimeout, FlakyTestTimeout(msg), sys.exc_info()[2]) if sysinfo.LIBUV: reraiseFlakyTestRaceConditionLibuv = reraiseFlakyTestRaceCondition reraiseFlakyTestTimeoutLibuv = reraiseFlakyTestTimeout def reraises_flaky_timeout(exc_kind=AssertionError, _func=reraiseFlakyTestTimeout): def wrapper(f): @functools.wraps(f) def m(*args): try: f(*args) except exc_kind: _func() return m return wrapper def reraises_flaky_race_condition(exc_kind=AssertionError): return reraises_flaky_timeout(exc_kind, _func=reraiseFlakyTestRaceCondition)