/usr/lib/python2.7/dist-packages/kazoo/tests/test_lock.py is in python-kazoo 2.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import threading
import time
import uuid
from nose.tools import eq_, ok_
from kazoo.exceptions import CancelledError
from kazoo.exceptions import LockTimeout
from kazoo.testing import KazooTestCase
from kazoo.tests import util as test_util
class SleepBarrier(object):
"""A crappy spinning barrier."""
def __init__(self, wait_for, sleep_func):
self._wait_for = wait_for
self._arrived = collections.deque()
self._sleep_func = sleep_func
def __enter__(self):
self._arrived.append(threading.current_thread())
return self
def __exit__(self, type, value, traceback):
try:
self._arrived.remove(threading.current_thread())
except ValueError:
pass
def wait(self):
while len(self._arrived) < self._wait_for:
self._sleep_func(0.001)
class KazooLockTests(KazooTestCase):
thread_count = 20
def __init__(self, *args, **kw):
super(KazooLockTests, self).__init__(*args, **kw)
self.threads_made = []
def tearDown(self):
super(KazooLockTests, self).tearDown()
while self.threads_made:
t = self.threads_made.pop()
t.join()
@staticmethod
def make_condition():
return threading.Condition()
@staticmethod
def make_event():
return threading.Event()
def make_thread(self, *args, **kwargs):
t = threading.Thread(*args, **kwargs)
t.daemon = True
self.threads_made.append(t)
return t
@staticmethod
def make_wait():
return test_util.Wait()
def setUp(self):
super(KazooLockTests, self).setUp()
self.lockpath = "/" + uuid.uuid4().hex
self.condition = self.make_condition()
self.released = self.make_event()
self.active_thread = None
self.cancelled_threads = []
def _thread_lock_acquire_til_event(self, name, lock, event):
try:
with lock:
with self.condition:
eq_(self.active_thread, None)
self.active_thread = name
self.condition.notify_all()
event.wait()
with self.condition:
eq_(self.active_thread, name)
self.active_thread = None
self.condition.notify_all()
self.released.set()
except CancelledError:
with self.condition:
self.cancelled_threads.append(name)
self.condition.notify_all()
def test_lock_one(self):
lock_name = uuid.uuid4().hex
lock = self.client.Lock(self.lockpath, lock_name)
event = self.make_event()
thread = self.make_thread(target=self._thread_lock_acquire_til_event,
args=(lock_name, lock, event))
thread.start()
lock2_name = uuid.uuid4().hex
anotherlock = self.client.Lock(self.lockpath, lock2_name)
# wait for any contender to show up on the lock
wait = self.make_wait()
wait(anotherlock.contenders)
eq_(anotherlock.contenders(), [lock_name])
with self.condition:
while self.active_thread != lock_name:
self.condition.wait()
# release the lock
event.set()
with self.condition:
while self.active_thread:
self.condition.wait()
self.released.wait()
thread.join()
def test_lock(self):
threads = []
names = ["contender" + str(i) for i in range(5)]
contender_bits = {}
for name in names:
e = self.make_event()
l = self.client.Lock(self.lockpath, name)
t = self.make_thread(target=self._thread_lock_acquire_til_event,
args=(name, l, e))
contender_bits[name] = (t, e)
threads.append(t)
# acquire the lock ourselves first to make the others line up
lock = self.client.Lock(self.lockpath, "test")
lock.acquire()
for t in threads:
t.start()
# wait for everyone to line up on the lock
wait = self.make_wait()
wait(lambda: len(lock.contenders()) == 6)
contenders = lock.contenders()
eq_(contenders[0], "test")
contenders = contenders[1:]
remaining = list(contenders)
# release the lock and contenders should claim it in order
lock.release()
for contender in contenders:
thread, event = contender_bits[contender]
with self.condition:
while not self.active_thread:
self.condition.wait()
eq_(self.active_thread, contender)
eq_(lock.contenders(), remaining)
remaining = remaining[1:]
event.set()
with self.condition:
while self.active_thread:
self.condition.wait()
for thread in threads:
thread.join()
def test_lock_reconnect(self):
event = self.make_event()
other_lock = self.client.Lock(self.lockpath, 'contender')
thread = self.make_thread(target=self._thread_lock_acquire_til_event,
args=('contender', other_lock, event))
# acquire the lock ourselves first to make the contender line up
lock = self.client.Lock(self.lockpath, "test")
lock.acquire()
thread.start()
# wait for the contender to line up on the lock
wait = self.make_wait()
wait(lambda: len(lock.contenders()) == 2)
eq_(lock.contenders(), ['test', 'contender'])
self.expire_session(self.make_event)
lock.release()
with self.condition:
while not self.active_thread:
self.condition.wait()
eq_(self.active_thread, 'contender')
event.set()
thread.join()
def test_lock_non_blocking(self):
lock_name = uuid.uuid4().hex
lock = self.client.Lock(self.lockpath, lock_name)
event = self.make_event()
thread = self.make_thread(target=self._thread_lock_acquire_til_event,
args=(lock_name, lock, event))
thread.start()
lock1 = self.client.Lock(self.lockpath, lock_name)
# wait for the thread to acquire the lock
with self.condition:
if not self.active_thread:
self.condition.wait(5)
ok_(not lock1.acquire(blocking=False))
eq_(lock.contenders(), [lock_name]) # just one - itself
event.set()
thread.join()
def test_lock_fail_first_call(self):
event1 = self.make_event()
lock1 = self.client.Lock(self.lockpath, "one")
thread1 = self.make_thread(target=self._thread_lock_acquire_til_event,
args=("one", lock1, event1))
thread1.start()
# wait for this thread to acquire the lock
with self.condition:
if not self.active_thread:
self.condition.wait(5)
eq_(self.active_thread, "one")
eq_(lock1.contenders(), ["one"])
event1.set()
thread1.join()
def test_lock_cancel(self):
event1 = self.make_event()
lock1 = self.client.Lock(self.lockpath, "one")
thread1 = self.make_thread(target=self._thread_lock_acquire_til_event,
args=("one", lock1, event1))
thread1.start()
# wait for this thread to acquire the lock
with self.condition:
if not self.active_thread:
self.condition.wait(5)
eq_(self.active_thread, "one")
client2 = self._get_client()
client2.start()
event2 = self.make_event()
lock2 = client2.Lock(self.lockpath, "two")
thread2 = self.make_thread(target=self._thread_lock_acquire_til_event,
args=("two", lock2, event2))
thread2.start()
# this one should block in acquire. check that it is a contender
wait = self.make_wait()
wait(lambda: len(lock2.contenders()) > 1)
eq_(lock2.contenders(), ["one", "two"])
lock2.cancel()
with self.condition:
if "two" not in self.cancelled_threads:
self.condition.wait()
assert "two" in self.cancelled_threads
eq_(lock2.contenders(), ["one"])
thread2.join()
event1.set()
thread1.join()
client2.stop()
def test_lock_no_double_calls(self):
lock1 = self.client.Lock(self.lockpath, "one")
lock1.acquire()
self.assertTrue(lock1.is_acquired)
self.assertFalse(lock1.acquire(timeout=0.5))
self.assertTrue(lock1.is_acquired)
lock1.release()
self.assertFalse(lock1.is_acquired)
def test_lock_same_thread_no_block(self):
lock = self.client.Lock(self.lockpath, "one")
gotten = lock.acquire(blocking=False)
self.assertTrue(gotten)
self.assertTrue(lock.is_acquired)
gotten = lock.acquire(blocking=False)
self.assertFalse(gotten)
def test_lock_many_threads_no_block(self):
lock = self.client.Lock(self.lockpath, "one")
attempts = collections.deque()
def _acquire():
attempts.append(int(lock.acquire(blocking=False)))
threads = []
for _i in range(0, self.thread_count):
t = self.make_thread(target=_acquire)
threads.append(t)
t.start()
while threads:
t = threads.pop()
t.join()
self.assertEqual(1, sum(list(attempts)))
def test_lock_many_threads(self):
sleep_func = self.client.handler.sleep_func
lock = self.client.Lock(self.lockpath, "one")
acquires = collections.deque()
chain = collections.deque()
differences = collections.deque()
barrier = SleepBarrier(self.thread_count, sleep_func)
def _acquire():
# Wait until all threads are ready to go...
with barrier as b:
b.wait()
with lock:
# Ensure that no two threads enter here and cause the
# count to differ by more than one, do this by recording
# the count that was captured and examining it post run.
starting_count = len(acquires)
acquires.append(1)
sleep_func(0.01)
end_count = len(acquires)
differences.append(end_count - starting_count)
threads = []
for _i in range(0, self.thread_count):
t = self.make_thread(target=_acquire)
threads.append(t)
t.start()
while threads:
t = threads.pop()
t.join()
self.assertEqual(self.thread_count, len(acquires))
self.assertEqual([1] * self.thread_count, list(differences))
def test_lock_reacquire(self):
lock = self.client.Lock(self.lockpath, "one")
lock.acquire()
lock.release()
lock.acquire()
lock.release()
def test_lock_timeout(self):
timeout = 3
e = self.make_event()
started = self.make_event()
# In the background thread, acquire the lock and wait thrice the time
# that the main thread is going to wait to acquire the lock.
lock1 = self.client.Lock(self.lockpath, "one")
def _thread(lock, event, timeout):
with lock:
started.set()
event.wait(timeout)
if not event.isSet():
# Eventually fail to avoid hanging the tests
self.fail("lock2 never timed out")
t = self.make_thread(target=_thread, args=(lock1, e, timeout * 3))
t.start()
# Start the main thread's kazoo client and try to acquire the lock
# but give up after `timeout` seconds
client2 = self._get_client()
client2.start()
started.wait(5)
self.assertTrue(started.isSet())
lock2 = client2.Lock(self.lockpath, "two")
try:
lock2.acquire(timeout=timeout)
except LockTimeout:
# A timeout is the behavior we're expecting, since the background
# thread should still be holding onto the lock
pass
else:
self.fail("Main thread unexpectedly acquired the lock")
finally:
# Cleanup
e.set()
t.join()
client2.stop()
class TestSemaphore(KazooTestCase):
def __init__(self, *args, **kw):
super(TestSemaphore, self).__init__(*args, **kw)
self.threads_made = []
def tearDown(self):
super(TestSemaphore, self).tearDown()
while self.threads_made:
t = self.threads_made.pop()
t.join()
@staticmethod
def make_condition():
return threading.Condition()
@staticmethod
def make_event():
return threading.Event()
def make_thread(self, *args, **kwargs):
t = threading.Thread(*args, **kwargs)
t.daemon = True
self.threads_made.append(t)
return t
def setUp(self):
super(TestSemaphore, self).setUp()
self.lockpath = "/" + uuid.uuid4().hex
self.condition = self.make_condition()
self.released = self.make_event()
self.active_thread = None
self.cancelled_threads = []
def test_basic(self):
sem1 = self.client.Semaphore(self.lockpath)
sem1.acquire()
sem1.release()
def test_lock_one(self):
sem1 = self.client.Semaphore(self.lockpath, max_leases=1)
sem2 = self.client.Semaphore(self.lockpath, max_leases=1)
started = self.make_event()
event = self.make_event()
sem1.acquire()
def sema_one():
started.set()
with sem2:
event.set()
thread = self.make_thread(target=sema_one, args=())
thread.start()
started.wait(10)
self.assertFalse(event.is_set())
sem1.release()
event.wait(10)
self.assert_(event.is_set())
thread.join()
def test_non_blocking(self):
sem1 = self.client.Semaphore(
self.lockpath, identifier='sem1', max_leases=2)
sem2 = self.client.Semaphore(
self.lockpath, identifier='sem2', max_leases=2)
sem3 = self.client.Semaphore(
self.lockpath, identifier='sem3', max_leases=2)
sem1.acquire()
sem2.acquire()
ok_(not sem3.acquire(blocking=False))
eq_(set(sem1.lease_holders()), set(['sem1', 'sem2']))
sem2.release()
# the next line isn't required, but avoids timing issues in tests
sem3.acquire()
eq_(set(sem1.lease_holders()), set(['sem1', 'sem3']))
sem1.release()
sem3.release()
def test_non_blocking_release(self):
sem1 = self.client.Semaphore(
self.lockpath, identifier='sem1', max_leases=1)
sem2 = self.client.Semaphore(
self.lockpath, identifier='sem2', max_leases=1)
sem1.acquire()
sem2.acquire(blocking=False)
# make sure there's no shutdown / cleanup error
sem1.release()
sem2.release()
def test_holders(self):
started = self.make_event()
event = self.make_event()
def sema_one():
with self.client.Semaphore(self.lockpath, 'fred', max_leases=1):
started.set()
event.wait()
thread = self.make_thread(target=sema_one, args=())
thread.start()
started.wait()
sem1 = self.client.Semaphore(self.lockpath)
holders = sem1.lease_holders()
eq_(holders, ['fred'])
event.set()
thread.join()
def test_semaphore_cancel(self):
sem1 = self.client.Semaphore(self.lockpath, 'fred', max_leases=1)
sem2 = self.client.Semaphore(self.lockpath, 'george', max_leases=1)
sem1.acquire()
started = self.make_event()
event = self.make_event()
def sema_one():
started.set()
try:
with sem2:
started.set()
except CancelledError:
event.set()
thread = self.make_thread(target=sema_one, args=())
thread.start()
started.wait()
eq_(sem1.lease_holders(), ['fred'])
eq_(event.is_set(), False)
sem2.cancel()
event.wait()
eq_(event.is_set(), True)
thread.join()
def test_multiple_acquire_and_release(self):
sem1 = self.client.Semaphore(self.lockpath, 'fred', max_leases=1)
sem1.acquire()
sem1.acquire()
eq_(True, sem1.release())
eq_(False, sem1.release())
def test_handle_session_loss(self):
expire_semaphore = self.client.Semaphore(self.lockpath, 'fred',
max_leases=1)
client = self._get_client()
client.start()
lh_semaphore = client.Semaphore(self.lockpath, 'george', max_leases=1)
lh_semaphore.acquire()
started = self.make_event()
event = self.make_event()
event2 = self.make_event()
def sema_one():
started.set()
with expire_semaphore:
event.set()
event2.wait()
thread1 = self.make_thread(target=sema_one, args=())
thread1.start()
started.wait()
eq_(lh_semaphore.lease_holders(), ['george'])
# Fired in a separate thread to make sure we can see the effect
expired = self.make_event()
def expire():
self.expire_session(self.make_event)
expired.set()
thread2 = self.make_thread(target=expire, args=())
thread2.start()
expire_semaphore.wake_event.wait()
expired.wait()
lh_semaphore.release()
client.stop()
event.wait(15)
eq_(expire_semaphore.lease_holders(), ['fred'])
event2.set()
for t in (thread1, thread2):
t.join()
def test_inconsistent_max_leases(self):
sem1 = self.client.Semaphore(self.lockpath, max_leases=1)
sem2 = self.client.Semaphore(self.lockpath, max_leases=2)
sem1.acquire()
self.assertRaises(ValueError, sem2.acquire)
def test_inconsistent_max_leases_other_data(self):
sem1 = self.client.Semaphore(self.lockpath, max_leases=1)
sem2 = self.client.Semaphore(self.lockpath, max_leases=2)
self.client.ensure_path(self.lockpath)
self.client.set(self.lockpath, b'a$')
sem1.acquire()
# sem2 thinks it's ok to have two lease holders
ok_(sem2.acquire(blocking=False))
def test_reacquire(self):
lock = self.client.Semaphore(self.lockpath)
lock.acquire()
lock.release()
lock.acquire()
lock.release()
def test_acquire_after_cancelled(self):
lock = self.client.Semaphore(self.lockpath)
self.assertTrue(lock.acquire())
self.assertTrue(lock.release())
lock.cancel()
self.assertTrue(lock.cancelled)
self.assertTrue(lock.acquire())
def test_timeout(self):
timeout = 3
e = self.make_event()
started = self.make_event()
# In the background thread, acquire the lock and wait thrice the time
# that the main thread is going to wait to acquire the lock.
sem1 = self.client.Semaphore(self.lockpath, "one")
def _thread(sem, event, timeout):
with sem:
started.set()
event.wait(timeout)
if not event.isSet():
# Eventually fail to avoid hanging the tests
self.fail("sem2 never timed out")
t = self.make_thread(target=_thread, args=(sem1, e, timeout * 3))
t.start()
# Start the main thread's kazoo client and try to acquire the lock
# but give up after `timeout` seconds
client2 = self._get_client()
client2.start()
started.wait(5)
self.assertTrue(started.isSet())
sem2 = client2.Semaphore(self.lockpath, "two")
try:
sem2.acquire(timeout=timeout)
except LockTimeout:
# A timeout is the behavior we're expecting, since the background
# thread will still be holding onto the lock
e.set()
finally:
# Cleanup
t.join()
client2.stop()
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