Viewing file:  error_handler_test.py (5.08 KB) -rw-r--r--
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"""Tests for certbot._internal.error_handler."""
import contextlib
import signal
import sys
from typing import Callable
from typing import Dict
from typing import Union
import unittest
from unittest import mock
import pytest
from certbot.compat import os
def get_signals(signums):
"""Get the handlers for an iterable of signums."""
return {s: signal.getsignal(s) for s in signums}
def set_signals(sig_handler_dict):
"""Set the signal (keys) with the handler (values) from the input dict."""
for s, h in sig_handler_dict.items():
signal.signal(s, h)
@contextlib.contextmanager
def signal_receiver(signums):
"""Context manager to catch signals"""
signals = []
prev_handlers: Dict[int, Union[int, None, Callable]] = get_signals(signums)
set_signals({s: lambda s, _: signals.append(s) for s in signums})
yield signals
set_signals(prev_handlers)
def send_signal(signum):
"""Send the given signal"""
os.kill(os.getpid(), signum)
class ErrorHandlerTest(unittest.TestCase):
"""Tests for certbot._internal.error_handler.ErrorHandler."""
def setUp(self):
from certbot._internal import error_handler
self.init_func = mock.MagicMock()
self.init_args = {42,}
self.init_kwargs = {'foo': 'bar'}
self.handler = error_handler.ErrorHandler(self.init_func,
*self.init_args,
**self.init_kwargs)
# pylint: disable=protected-access
self.signals = error_handler._SIGNALS
def test_context_manager(self):
exception_raised = False
try:
with self.handler:
raise ValueError
except ValueError:
exception_raised = True
assert exception_raised
self.init_func.assert_called_once_with(*self.init_args,
**self.init_kwargs)
def test_context_manager_with_signal(self):
if not self.signals:
self.skipTest(reason='Signals cannot be handled on Windows.')
init_signals = get_signals(self.signals)
with signal_receiver(self.signals) as signals_received:
with self.handler:
should_be_42 = 42
send_signal(self.signals[0])
should_be_42 *= 10
# check execution stopped when the signal was sent
assert 42 == should_be_42
# assert signals were caught
assert [self.signals[0]] == signals_received
# assert the error handling function was just called once
self.init_func.assert_called_once_with(*self.init_args,
**self.init_kwargs)
for signum in self.signals:
assert init_signals[signum] == signal.getsignal(signum)
def test_bad_recovery(self):
bad_func = mock.MagicMock(side_effect=[ValueError])
self.handler.register(bad_func)
try:
with self.handler:
raise ValueError
except ValueError:
pass
self.init_func.assert_called_once_with(*self.init_args,
**self.init_kwargs)
bad_func.assert_called_once_with()
def test_bad_recovery_with_signal(self):
if not self.signals:
self.skipTest(reason='Signals cannot be handled on Windows.')
sig1 = self.signals[0]
sig2 = self.signals[-1]
bad_func = mock.MagicMock(side_effect=lambda: send_signal(sig1))
self.handler.register(bad_func)
with signal_receiver(self.signals) as signals_received:
with self.handler:
send_signal(sig2)
assert [sig2, sig1] == signals_received
self.init_func.assert_called_once_with(*self.init_args,
**self.init_kwargs)
bad_func.assert_called_once_with()
def test_sysexit_ignored(self):
try:
with self.handler:
sys.exit(0)
except SystemExit:
pass
assert self.init_func.called is False
def test_regular_exit(self):
func = mock.MagicMock()
self.handler.register(func)
with self.handler:
pass
self.init_func.assert_not_called()
func.assert_not_called()
class ExitHandlerTest(ErrorHandlerTest):
"""Tests for certbot._internal.error_handler.ExitHandler."""
def setUp(self):
from certbot._internal import error_handler
super().setUp()
self.handler = error_handler.ExitHandler(self.init_func,
*self.init_args,
**self.init_kwargs)
def test_regular_exit(self):
func = mock.MagicMock()
self.handler.register(func)
with self.handler:
pass
self.init_func.assert_called_once_with(*self.init_args,
**self.init_kwargs)
func.assert_called_once_with()
if __name__ == "__main__":
sys.exit(pytest.main(sys.argv[1:] + [__file__])) # pragma: no cover
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