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import os
import threading
import shutil
import lockfile
class ComplianceTest(object):
def __init__(self):
self.saved_class = lockfile.LockFile
def _testfile(self):
"""Return platform-appropriate file. Helper for tests."""
import tempfile
return os.path.join(tempfile.gettempdir(), 'trash-%s' % os.getpid())
def setup(self):
lockfile.LockFile = self.class_to_test
def teardown(self):
try:
tf = self._testfile()
if os.path.isdir(tf):
shutil.rmtree(tf)
elif os.path.isfile(tf):
os.unlink(tf)
elif not os.path.exists(tf):
pass
else:
raise SystemError("unrecognized file: %s" % tf)
finally:
lockfile.LockFile = self.saved_class
def _test_acquire_helper(self, tbool):
# As simple as it gets.
lock = lockfile.LockFile(self._testfile(), threaded=tbool)
lock.acquire()
assert lock.i_am_locking()
lock.release()
assert not lock.is_locked()
# def test_acquire_basic_threaded(self):
# self._test_acquire_helper(True)
def test_acquire_basic_unthreaded(self):
self._test_acquire_helper(False)
def _test_acquire_no_timeout_helper(self, tbool):
# No timeout test
e1, e2 = threading.Event(), threading.Event()
t = _in_thread(self._lock_wait_unlock, e1, e2)
e1.wait() # wait for thread t to acquire lock
lock2 = lockfile.LockFile(self._testfile(), threaded=tbool)
assert lock2.is_locked()
if tbool:
assert not lock2.i_am_locking()
else:
assert lock2.i_am_locking()
try:
lock2.acquire(timeout=-1)
except lockfile.AlreadyLocked:
pass
else:
lock2.release()
raise AssertionError("did not raise AlreadyLocked in"
" thread %s" %
threading.current_thread().get_name())
try:
lock2.acquire(timeout=0)
except lockfile.AlreadyLocked:
pass
else:
lock2.release()
raise AssertionError("did not raise AlreadyLocked in"
" thread %s" %
threading.current_thread().get_name())
e2.set() # tell thread t to release lock
t.join()
# def test_acquire_no_timeout_threaded(self):
# self._test_acquire_no_timeout_helper(True)
# def test_acquire_no_timeout_unthreaded(self):
# self._test_acquire_no_timeout_helper(False)
def _test_acquire_timeout_helper(self, tbool):
# Timeout test
e1, e2 = threading.Event(), threading.Event()
t = _in_thread(self._lock_wait_unlock, e1, e2)
e1.wait() # wait for thread t to acquire lock
lock2 = lockfile.LockFile(self._testfile(), threaded=tbool)
assert lock2.is_locked()
try:
lock2.acquire(timeout=0.1)
except lockfile.LockTimeout:
pass
else:
lock2.release()
raise AssertionError("did not raise LockTimeout in thread %s" %
threading.current_thread().get_name())
e2.set()
t.join()
def test_acquire_timeout_threaded(self):
self._test_acquire_timeout_helper(True)
def test_acquire_timeout_unthreaded(self):
self._test_acquire_timeout_helper(False)
def _test_context_timeout_helper(self, tbool):
# Timeout test
e1, e2 = threading.Event(), threading.Event()
t = _in_thread(self._lock_wait_unlock, e1, e2)
e1.wait() # wait for thread t to acquire lock
lock2 = lockfile.LockFile(self._testfile(), threaded=tbool,
timeout=0.2)
assert lock2.is_locked()
try:
lock2.acquire()
except lockfile.LockTimeout:
pass
else:
lock2.release()
raise AssertionError("did not raise LockTimeout in thread %s" %
threading.current_thread().get_name())
e2.set()
t.join()
def test_context_timeout_unthreaded(self):
self._test_context_timeout_helper(False)
def _test_release_basic_helper(self, tbool):
lock = lockfile.LockFile(self._testfile(), threaded=tbool)
lock.acquire()
assert lock.is_locked()
lock.release()
assert not lock.is_locked()
assert not lock.i_am_locking()
try:
lock.release()
except lockfile.NotLocked:
pass
except lockfile.NotMyLock:
raise AssertionError('unexpected exception: %s' %
lockfile.NotMyLock)
else:
raise AssertionError('erroneously unlocked file')
# def test_release_basic_threaded(self):
# self._test_release_basic_helper(True)
def test_release_basic_unthreaded(self):
self._test_release_basic_helper(False)
# def test_release_from_thread(self):
# e1, e2 = threading.Event(), threading.Event()
# t = _in_thread(self._lock_wait_unlock, e1, e2)
# e1.wait()
# lock2 = lockfile.LockFile(self._testfile(), threaded=False)
# assert not lock2.i_am_locking()
# try:
# lock2.release()
# except lockfile.NotMyLock:
# pass
# else:
# raise AssertionError('erroneously unlocked a file locked'
# ' by another thread.')
# e2.set()
# t.join()
def _test_is_locked_helper(self, tbool):
lock = lockfile.LockFile(self._testfile(), threaded=tbool)
lock.acquire(timeout=2)
assert lock.is_locked()
lock.release()
assert not lock.is_locked(), "still locked after release!"
# def test_is_locked_threaded(self):
# self._test_is_locked_helper(True)
def test_is_locked_unthreaded(self):
self._test_is_locked_helper(False)
# def test_i_am_locking_threaded(self):
# self._test_i_am_locking_helper(True)
def test_i_am_locking_unthreaded(self):
self._test_i_am_locking_helper(False)
def _test_i_am_locking_helper(self, tbool):
lock1 = lockfile.LockFile(self._testfile(), threaded=tbool)
assert not lock1.is_locked()
lock1.acquire()
try:
assert lock1.i_am_locking()
lock2 = lockfile.LockFile(self._testfile(), threaded=tbool)
assert lock2.is_locked()
if tbool:
assert not lock2.i_am_locking()
finally:
lock1.release()
def _test_break_lock_helper(self, tbool):
lock = lockfile.LockFile(self._testfile(), threaded=tbool)
lock.acquire()
assert lock.is_locked()
lock2 = lockfile.LockFile(self._testfile(), threaded=tbool)
assert lock2.is_locked()
lock2.break_lock()
assert not lock2.is_locked()
try:
lock.release()
except lockfile.NotLocked:
pass
else:
raise AssertionError('break lock failed')
# def test_break_lock_threaded(self):
# self._test_break_lock_helper(True)
def test_break_lock_unthreaded(self):
self._test_break_lock_helper(False)
def _lock_wait_unlock(self, event1, event2):
"""Lock from another thread. Helper for tests."""
l = lockfile.LockFile(self._testfile())
l.acquire()
try:
event1.set() # we're in,
event2.wait() # wait for boss's permission to leave
finally:
l.release()
def test_enter(self):
lock = lockfile.LockFile(self._testfile())
lock.acquire()
try:
assert lock.is_locked(), "Not locked after acquire!"
finally:
lock.release()
assert not lock.is_locked(), "still locked after release!"
def test_decorator(self):
@lockfile.locked(self._testfile())
def func(a, b):
return a + b
assert func(4, 3) == 7
def _in_thread(func, *args, **kwargs):
"""Execute func(*args, **kwargs) after dt seconds. Helper for tests."""
def _f():
func(*args, **kwargs)
t = threading.Thread(target=_f, name='/*/*')
t.setDaemon(True)
t.start()
return t
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