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import io
import os
import sys
from typing import Generator
from typing import TextIO
import pytest
from _pytest.config import Config
from _pytest.config.argparsing import Parser
from _pytest.nodes import Item
from _pytest.store import StoreKey
fault_handler_stderr_key = StoreKey[TextIO]()
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
if not faulthandler.is_enabled():
# faulthhandler is not enabled, so install plugin that does the actual work
# of enabling faulthandler before each test executes.
config.pluginmanager.register(FaultHandlerHooks(), "faulthandler-hooks")
else:
# Do not handle dumping to stderr if faulthandler is already enabled, so warn
# users that the option is being ignored.
timeout = FaultHandlerHooks.get_timeout_config_value(config)
if timeout > 0:
config.issue_config_time_warning(
pytest.PytestConfigWarning(
"faulthandler module enabled before pytest configuration step, "
"'faulthandler_timeout' option ignored"
),
stacklevel=2,
)
class FaultHandlerHooks:
"""Implements hooks that will actually install fault handler before tests execute,
as well as correctly handle pdb and internal errors."""
def pytest_configure(self, config: Config) -> None:
import faulthandler
stderr_fd_copy = os.dup(self._get_stderr_fileno())
config._store[fault_handler_stderr_key] = open(stderr_fd_copy, "w")
faulthandler.enable(file=config._store[fault_handler_stderr_key])
def pytest_unconfigure(self, config: Config) -> None:
import faulthandler
faulthandler.disable()
# close our dup file installed during pytest_configure
# re-enable the faulthandler, attaching it to the default sys.stderr
# so we can see crashes after pytest has finished, usually during
# garbage collection during interpreter shutdown
config._store[fault_handler_stderr_key].close()
del config._store[fault_handler_stderr_key]
faulthandler.enable(file=self._get_stderr_fileno())
@staticmethod
def _get_stderr_fileno():
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()
@staticmethod
def get_timeout_config_value(config):
return float(config.getini("faulthandler_timeout") or 0.0)
@pytest.hookimpl(hookwrapper=True, trylast=True)
def pytest_runtest_protocol(self, item: Item) -> Generator[None, None, None]:
timeout = self.get_timeout_config_value(item.config)
stderr = item.config._store[fault_handler_stderr_key]
if timeout > 0 and stderr is not None:
import faulthandler
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(self) -> 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(self) -> None:
"""Cancel any traceback dumping due to an interactive exception being
raised."""
import faulthandler
faulthandler.cancel_dump_traceback_later()
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