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