91 lines
3.0 KiB
Python
91 lines
3.0 KiB
Python
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import threading
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import traceback
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import warnings
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from types import TracebackType
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from typing import Any
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from typing import Callable
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from typing import Generator
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from typing import Optional
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from typing import Type
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import pytest
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# Copied from cpython/Lib/test/support/threading_helper.py, with modifications.
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class catch_threading_exception:
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"""Context manager catching threading.Thread exception using
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threading.excepthook.
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Storing exc_value using a custom hook can create a reference cycle. The
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reference cycle is broken explicitly when the context manager exits.
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Storing thread using a custom hook can resurrect it if it is set to an
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object which is being finalized. Exiting the context manager clears the
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stored object.
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Usage:
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with threading_helper.catch_threading_exception() as cm:
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# code spawning a thread which raises an exception
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...
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# check the thread exception: use cm.args
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...
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# cm.args attribute no longer exists at this point
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# (to break a reference cycle)
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"""
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def __init__(self) -> None:
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# See https://github.com/python/typeshed/issues/4767 regarding the underscore.
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self.args: Optional["threading._ExceptHookArgs"] = None
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self._old_hook: Optional[Callable[["threading._ExceptHookArgs"], Any]] = None
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def _hook(self, args: "threading._ExceptHookArgs") -> None:
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self.args = args
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def __enter__(self) -> "catch_threading_exception":
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self._old_hook = threading.excepthook
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threading.excepthook = self._hook
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return self
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def __exit__(
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self,
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exc_type: Optional[Type[BaseException]],
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exc_val: Optional[BaseException],
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exc_tb: Optional[TracebackType],
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) -> None:
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assert self._old_hook is not None
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threading.excepthook = self._old_hook
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self._old_hook = None
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del self.args
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def thread_exception_runtest_hook() -> Generator[None, None, None]:
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with catch_threading_exception() as cm:
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yield
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if cm.args:
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if cm.args.thread is not None:
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thread_name = cm.args.thread.name
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else:
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thread_name = "<unknown>"
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msg = f"Exception in thread {thread_name}\n\n"
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msg += "".join(
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traceback.format_exception(
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cm.args.exc_type, cm.args.exc_value, cm.args.exc_traceback,
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)
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)
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warnings.warn(pytest.PytestUnhandledThreadExceptionWarning(msg))
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@pytest.hookimpl(hookwrapper=True, trylast=True)
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def pytest_runtest_setup() -> Generator[None, None, None]:
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yield from thread_exception_runtest_hook()
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@pytest.hookimpl(hookwrapper=True, tryfirst=True)
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def pytest_runtest_call() -> Generator[None, None, None]:
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yield from thread_exception_runtest_hook()
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@pytest.hookimpl(hookwrapper=True, tryfirst=True)
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def pytest_runtest_teardown() -> Generator[None, None, None]:
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yield from thread_exception_runtest_hook()
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