98 lines
3.1 KiB
Python
98 lines
3.1 KiB
Python
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import io
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import os
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import sys
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from typing import Generator
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from typing import TextIO
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import pytest
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from _pytest.config import Config
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from _pytest.config.argparsing import Parser
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from _pytest.nodes import Item
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from _pytest.stash import StashKey
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fault_handler_stderr_key = StashKey[TextIO]()
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fault_handler_originally_enabled_key = StashKey[bool]()
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def pytest_addoption(parser: Parser) -> None:
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help = (
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"Dump the traceback of all threads if a test takes "
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"more than TIMEOUT seconds to finish"
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)
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parser.addini("faulthandler_timeout", help, default=0.0)
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def pytest_configure(config: Config) -> None:
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import faulthandler
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stderr_fd_copy = os.dup(get_stderr_fileno())
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config.stash[fault_handler_stderr_key] = open(stderr_fd_copy, "w")
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config.stash[fault_handler_originally_enabled_key] = faulthandler.is_enabled()
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faulthandler.enable(file=config.stash[fault_handler_stderr_key])
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def pytest_unconfigure(config: Config) -> None:
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import faulthandler
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faulthandler.disable()
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# Close the dup file installed during pytest_configure.
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if fault_handler_stderr_key in config.stash:
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config.stash[fault_handler_stderr_key].close()
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del config.stash[fault_handler_stderr_key]
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if config.stash.get(fault_handler_originally_enabled_key, False):
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# Re-enable the faulthandler if it was originally enabled.
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faulthandler.enable(file=get_stderr_fileno())
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def get_stderr_fileno() -> int:
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try:
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fileno = sys.stderr.fileno()
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# The Twisted Logger will return an invalid file descriptor since it is not backed
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# by an FD. So, let's also forward this to the same code path as with pytest-xdist.
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if fileno == -1:
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raise AttributeError()
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return fileno
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except (AttributeError, io.UnsupportedOperation):
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# pytest-xdist monkeypatches sys.stderr with an object that is not an actual file.
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# https://docs.python.org/3/library/faulthandler.html#issue-with-file-descriptors
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# This is potentially dangerous, but the best we can do.
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return sys.__stderr__.fileno()
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def get_timeout_config_value(config: Config) -> float:
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return float(config.getini("faulthandler_timeout") or 0.0)
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@pytest.hookimpl(hookwrapper=True, trylast=True)
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def pytest_runtest_protocol(item: Item) -> Generator[None, None, None]:
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timeout = get_timeout_config_value(item.config)
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stderr = item.config.stash[fault_handler_stderr_key]
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if timeout > 0 and stderr is not None:
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import faulthandler
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faulthandler.dump_traceback_later(timeout, file=stderr)
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try:
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yield
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finally:
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faulthandler.cancel_dump_traceback_later()
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else:
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yield
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@pytest.hookimpl(tryfirst=True)
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def pytest_enter_pdb() -> None:
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"""Cancel any traceback dumping due to timeout before entering pdb."""
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import faulthandler
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faulthandler.cancel_dump_traceback_later()
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@pytest.hookimpl(tryfirst=True)
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def pytest_exception_interact() -> None:
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"""Cancel any traceback dumping due to an interactive exception being
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raised."""
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import faulthandler
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faulthandler.cancel_dump_traceback_later()
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