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# Copyright (C) 2011 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import os
import signal
import threading
import weakref
from bzrlib import tests, transport
from bzrlib.smart import client, medium, server, signals
# Windows doesn't define SIGHUP. And while we could just skip a lot of these
# tests, we often don't actually care about interaction with 'signal', so we
# can still run the tests for code coverage.
SIGHUP = getattr(signal, 'SIGHUP', 1)
class TestSignalHandlers(tests.TestCase):
def setUp(self):
super(TestSignalHandlers, self).setUp()
# This allows us to mutate the signal handler callbacks, but leave it
# 'pristine' after the test case.
# TODO: Arguably, this could be put into the base test.TestCase, along
# with a tearDown that asserts that all the entries have been
# removed properly. Global state is always a bit messy. A shame
# that we need it for signal handling.
orig = signals._setup_on_hangup_dict()
self.assertIs(None, orig)
def cleanup():
signals._on_sighup = None
self.addCleanup(cleanup)
def test_registered_callback_gets_called(self):
calls = []
def call_me():
calls.append('called')
signals.register_on_hangup('myid', call_me)
signals._sighup_handler(SIGHUP, None)
self.assertEqual(['called'], calls)
signals.unregister_on_hangup('myid')
def test_unregister_not_present(self):
# We don't want unregister to fail, since it is generally run at times
# that shouldn't interrupt other flow.
signals.unregister_on_hangup('no-such-id')
log = self.get_log()
self.assertContainsRe(log, 'Error occurred during unregister_on_hangup:')
self.assertContainsRe(log, '(?s)Traceback.*KeyError')
def test_failing_callback(self):
calls = []
def call_me():
calls.append('called')
def fail_me():
raise RuntimeError('something bad happened')
signals.register_on_hangup('myid', call_me)
signals.register_on_hangup('otherid', fail_me)
# _sighup_handler should call both, even though it got an exception
signals._sighup_handler(SIGHUP, None)
signals.unregister_on_hangup('myid')
signals.unregister_on_hangup('otherid')
log = self.get_log()
self.assertContainsRe(log, '(?s)Traceback.*RuntimeError')
self.assertEqual(['called'], calls)
def test_unregister_during_call(self):
# _sighup_handler should handle if some callbacks actually remove
# themselves while running.
calls = []
def call_me_and_unregister():
signals.unregister_on_hangup('myid')
calls.append('called_and_unregistered')
def call_me():
calls.append('called')
signals.register_on_hangup('myid', call_me_and_unregister)
signals.register_on_hangup('other', call_me)
signals._sighup_handler(SIGHUP, None)
def test_keyboard_interrupt_propagated(self):
# In case we get 'stuck' while running a hangup function, we should
# not suppress KeyboardInterrupt
def call_me_and_raise():
raise KeyboardInterrupt()
signals.register_on_hangup('myid', call_me_and_raise)
self.assertRaises(KeyboardInterrupt,
signals._sighup_handler, SIGHUP, None)
signals.unregister_on_hangup('myid')
def test_weak_references(self):
# TODO: This is probably a very-CPython-specific test
# Adding yourself to the callback should not make you immortal
# We overrideAttr during the test suite, so that we don't pollute the
# original dict. However, we can test that what we override matches
# what we are putting there.
self.assertIsInstance(signals._on_sighup,
weakref.WeakValueDictionary)
calls = []
def call_me():
calls.append('called')
signals.register_on_hangup('myid', call_me)
del call_me
# Non-CPython might want to do a gc.collect() here
signals._sighup_handler(SIGHUP, None)
self.assertEqual([], calls)
def test_not_installed(self):
# If you haven't called bzrlib.smart.signals.install_sighup_handler,
# then _on_sighup should be None, and all the calls become no-ops.
signals._on_sighup = None
calls = []
def call_me():
calls.append('called')
signals.register_on_hangup('myid', calls)
signals._sighup_handler(SIGHUP, None)
signals.unregister_on_hangup('myid')
log = self.get_log()
self.assertEqual('', log)
def test_install_sighup_handler(self):
# install_sighup_handler should set up a signal handler for SIGHUP, as
# well as the signals._on_sighup dict.
signals._on_sighup = None
orig = signals.install_sighup_handler()
if getattr(signal, 'SIGHUP', None) is not None:
cur = signal.getsignal(SIGHUP)
self.assertEqual(signals._sighup_handler, cur)
self.assertIsNot(None, signals._on_sighup)
signals.restore_sighup_handler(orig)
self.assertIs(None, signals._on_sighup)
class TestInetServer(tests.TestCase):
def create_file_pipes(self):
r, w = os.pipe()
rf = os.fdopen(r, 'rb')
wf = os.fdopen(w, 'wb')
return rf, wf
def test_inet_server_responds_to_sighup(self):
t = transport.get_transport('memory:///')
content = 'a'*1024*1024
t.put_bytes('bigfile', content)
factory = server.BzrServerFactory()
# Override stdin/stdout so that we can inject our own handles
client_read, server_write = self.create_file_pipes()
server_read, client_write = self.create_file_pipes()
factory._get_stdin_stdout = lambda: (server_read, server_write)
factory.set_up(t, None, None, inet=True, timeout=4.0)
self.addCleanup(factory.tear_down)
started = threading.Event()
stopped = threading.Event()
def serving():
started.set()
factory.smart_server.serve()
stopped.set()
server_thread = threading.Thread(target=serving)
server_thread.start()
started.wait()
client_medium = medium.SmartSimplePipesClientMedium(client_read,
client_write, 'base')
client_client = client._SmartClient(client_medium)
resp, response_handler = client_client.call_expecting_body('get',
'bigfile')
signals._sighup_handler(SIGHUP, None)
self.assertTrue(factory.smart_server.finished)
# We can still finish reading the file content, but more than that, and
# the file is closed.
v = response_handler.read_body_bytes()
if v != content:
self.fail('Got the wrong content back, expected 1M "a"')
stopped.wait()
server_thread.join()
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