359 lines
13 KiB
Python
359 lines
13 KiB
Python
# Some simple queue module tests, plus some failure conditions
|
|
# to ensure the Queue locks remain stable.
|
|
import queue
|
|
import time
|
|
import unittest
|
|
from test import support
|
|
threading = support.import_module('threading')
|
|
|
|
QUEUE_SIZE = 5
|
|
|
|
def qfull(q):
|
|
return q.maxsize > 0 and q.qsize() == q.maxsize
|
|
|
|
# A thread to run a function that unclogs a blocked Queue.
|
|
class _TriggerThread(threading.Thread):
|
|
def __init__(self, fn, args):
|
|
self.fn = fn
|
|
self.args = args
|
|
self.startedEvent = threading.Event()
|
|
threading.Thread.__init__(self)
|
|
|
|
def run(self):
|
|
# The sleep isn't necessary, but is intended to give the blocking
|
|
# function in the main thread a chance at actually blocking before
|
|
# we unclog it. But if the sleep is longer than the timeout-based
|
|
# tests wait in their blocking functions, those tests will fail.
|
|
# So we give them much longer timeout values compared to the
|
|
# sleep here (I aimed at 10 seconds for blocking functions --
|
|
# they should never actually wait that long - they should make
|
|
# progress as soon as we call self.fn()).
|
|
time.sleep(0.1)
|
|
self.startedEvent.set()
|
|
self.fn(*self.args)
|
|
|
|
|
|
# Execute a function that blocks, and in a separate thread, a function that
|
|
# triggers the release. Returns the result of the blocking function. Caution:
|
|
# block_func must guarantee to block until trigger_func is called, and
|
|
# trigger_func must guarantee to change queue state so that block_func can make
|
|
# enough progress to return. In particular, a block_func that just raises an
|
|
# exception regardless of whether trigger_func is called will lead to
|
|
# timing-dependent sporadic failures, and one of those went rarely seen but
|
|
# undiagnosed for years. Now block_func must be unexceptional. If block_func
|
|
# is supposed to raise an exception, call do_exceptional_blocking_test()
|
|
# instead.
|
|
|
|
class BlockingTestMixin:
|
|
|
|
def tearDown(self):
|
|
self.t = None
|
|
|
|
def do_blocking_test(self, block_func, block_args, trigger_func, trigger_args):
|
|
self.t = _TriggerThread(trigger_func, trigger_args)
|
|
self.t.start()
|
|
self.result = block_func(*block_args)
|
|
# If block_func returned before our thread made the call, we failed!
|
|
if not self.t.startedEvent.is_set():
|
|
self.fail("blocking function '%r' appeared not to block" %
|
|
block_func)
|
|
self.t.join(10) # make sure the thread terminates
|
|
if self.t.is_alive():
|
|
self.fail("trigger function '%r' appeared to not return" %
|
|
trigger_func)
|
|
return self.result
|
|
|
|
# Call this instead if block_func is supposed to raise an exception.
|
|
def do_exceptional_blocking_test(self,block_func, block_args, trigger_func,
|
|
trigger_args, expected_exception_class):
|
|
self.t = _TriggerThread(trigger_func, trigger_args)
|
|
self.t.start()
|
|
try:
|
|
try:
|
|
block_func(*block_args)
|
|
except expected_exception_class:
|
|
raise
|
|
else:
|
|
self.fail("expected exception of kind %r" %
|
|
expected_exception_class)
|
|
finally:
|
|
self.t.join(10) # make sure the thread terminates
|
|
if self.t.is_alive():
|
|
self.fail("trigger function '%r' appeared to not return" %
|
|
trigger_func)
|
|
if not self.t.startedEvent.is_set():
|
|
self.fail("trigger thread ended but event never set")
|
|
|
|
|
|
class BaseQueueTestMixin(BlockingTestMixin):
|
|
def setUp(self):
|
|
self.cum = 0
|
|
self.cumlock = threading.Lock()
|
|
|
|
def simple_queue_test(self, q):
|
|
if q.qsize():
|
|
raise RuntimeError("Call this function with an empty queue")
|
|
self.assertTrue(q.empty())
|
|
self.assertFalse(q.full())
|
|
# I guess we better check things actually queue correctly a little :)
|
|
q.put(111)
|
|
q.put(333)
|
|
q.put(222)
|
|
target_order = dict(Queue = [111, 333, 222],
|
|
LifoQueue = [222, 333, 111],
|
|
PriorityQueue = [111, 222, 333])
|
|
actual_order = [q.get(), q.get(), q.get()]
|
|
self.assertEqual(actual_order, target_order[q.__class__.__name__],
|
|
"Didn't seem to queue the correct data!")
|
|
for i in range(QUEUE_SIZE-1):
|
|
q.put(i)
|
|
self.assertTrue(q.qsize(), "Queue should not be empty")
|
|
self.assertTrue(not qfull(q), "Queue should not be full")
|
|
last = 2 * QUEUE_SIZE
|
|
full = 3 * 2 * QUEUE_SIZE
|
|
q.put(last)
|
|
self.assertTrue(qfull(q), "Queue should be full")
|
|
self.assertFalse(q.empty())
|
|
self.assertTrue(q.full())
|
|
try:
|
|
q.put(full, block=0)
|
|
self.fail("Didn't appear to block with a full queue")
|
|
except queue.Full:
|
|
pass
|
|
try:
|
|
q.put(full, timeout=0.01)
|
|
self.fail("Didn't appear to time-out with a full queue")
|
|
except queue.Full:
|
|
pass
|
|
# Test a blocking put
|
|
self.do_blocking_test(q.put, (full,), q.get, ())
|
|
self.do_blocking_test(q.put, (full, True, 10), q.get, ())
|
|
# Empty it
|
|
for i in range(QUEUE_SIZE):
|
|
q.get()
|
|
self.assertTrue(not q.qsize(), "Queue should be empty")
|
|
try:
|
|
q.get(block=0)
|
|
self.fail("Didn't appear to block with an empty queue")
|
|
except queue.Empty:
|
|
pass
|
|
try:
|
|
q.get(timeout=0.01)
|
|
self.fail("Didn't appear to time-out with an empty queue")
|
|
except queue.Empty:
|
|
pass
|
|
# Test a blocking get
|
|
self.do_blocking_test(q.get, (), q.put, ('empty',))
|
|
self.do_blocking_test(q.get, (True, 10), q.put, ('empty',))
|
|
|
|
|
|
def worker(self, q):
|
|
while True:
|
|
x = q.get()
|
|
if x < 0:
|
|
q.task_done()
|
|
return
|
|
with self.cumlock:
|
|
self.cum += x
|
|
q.task_done()
|
|
|
|
def queue_join_test(self, q):
|
|
self.cum = 0
|
|
for i in (0,1):
|
|
threading.Thread(target=self.worker, args=(q,)).start()
|
|
for i in range(100):
|
|
q.put(i)
|
|
q.join()
|
|
self.assertEqual(self.cum, sum(range(100)),
|
|
"q.join() did not block until all tasks were done")
|
|
for i in (0,1):
|
|
q.put(-1) # instruct the threads to close
|
|
q.join() # verify that you can join twice
|
|
|
|
def test_queue_task_done(self):
|
|
# Test to make sure a queue task completed successfully.
|
|
q = self.type2test()
|
|
try:
|
|
q.task_done()
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
self.fail("Did not detect task count going negative")
|
|
|
|
def test_queue_join(self):
|
|
# Test that a queue join()s successfully, and before anything else
|
|
# (done twice for insurance).
|
|
q = self.type2test()
|
|
self.queue_join_test(q)
|
|
self.queue_join_test(q)
|
|
try:
|
|
q.task_done()
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
self.fail("Did not detect task count going negative")
|
|
|
|
def test_simple_queue(self):
|
|
# Do it a couple of times on the same queue.
|
|
# Done twice to make sure works with same instance reused.
|
|
q = self.type2test(QUEUE_SIZE)
|
|
self.simple_queue_test(q)
|
|
self.simple_queue_test(q)
|
|
|
|
def test_negative_timeout_raises_exception(self):
|
|
q = self.type2test(QUEUE_SIZE)
|
|
with self.assertRaises(ValueError):
|
|
q.put(1, timeout=-1)
|
|
with self.assertRaises(ValueError):
|
|
q.get(1, timeout=-1)
|
|
|
|
def test_nowait(self):
|
|
q = self.type2test(QUEUE_SIZE)
|
|
for i in range(QUEUE_SIZE):
|
|
q.put_nowait(1)
|
|
with self.assertRaises(queue.Full):
|
|
q.put_nowait(1)
|
|
|
|
for i in range(QUEUE_SIZE):
|
|
q.get_nowait()
|
|
with self.assertRaises(queue.Empty):
|
|
q.get_nowait()
|
|
|
|
def test_shrinking_queue(self):
|
|
# issue 10110
|
|
q = self.type2test(3)
|
|
q.put(1)
|
|
q.put(2)
|
|
q.put(3)
|
|
with self.assertRaises(queue.Full):
|
|
q.put_nowait(4)
|
|
self.assertEqual(q.qsize(), 3)
|
|
q.maxsize = 2 # shrink the queue
|
|
with self.assertRaises(queue.Full):
|
|
q.put_nowait(4)
|
|
|
|
class QueueTest(BaseQueueTestMixin, unittest.TestCase):
|
|
type2test = queue.Queue
|
|
|
|
class LifoQueueTest(BaseQueueTestMixin, unittest.TestCase):
|
|
type2test = queue.LifoQueue
|
|
|
|
class PriorityQueueTest(BaseQueueTestMixin, unittest.TestCase):
|
|
type2test = queue.PriorityQueue
|
|
|
|
|
|
|
|
# A Queue subclass that can provoke failure at a moment's notice :)
|
|
class FailingQueueException(Exception):
|
|
pass
|
|
|
|
class FailingQueue(queue.Queue):
|
|
def __init__(self, *args):
|
|
self.fail_next_put = False
|
|
self.fail_next_get = False
|
|
queue.Queue.__init__(self, *args)
|
|
def _put(self, item):
|
|
if self.fail_next_put:
|
|
self.fail_next_put = False
|
|
raise FailingQueueException("You Lose")
|
|
return queue.Queue._put(self, item)
|
|
def _get(self):
|
|
if self.fail_next_get:
|
|
self.fail_next_get = False
|
|
raise FailingQueueException("You Lose")
|
|
return queue.Queue._get(self)
|
|
|
|
class FailingQueueTest(BlockingTestMixin, unittest.TestCase):
|
|
|
|
def failing_queue_test(self, q):
|
|
if q.qsize():
|
|
raise RuntimeError("Call this function with an empty queue")
|
|
for i in range(QUEUE_SIZE-1):
|
|
q.put(i)
|
|
# Test a failing non-blocking put.
|
|
q.fail_next_put = True
|
|
try:
|
|
q.put("oops", block=0)
|
|
self.fail("The queue didn't fail when it should have")
|
|
except FailingQueueException:
|
|
pass
|
|
q.fail_next_put = True
|
|
try:
|
|
q.put("oops", timeout=0.1)
|
|
self.fail("The queue didn't fail when it should have")
|
|
except FailingQueueException:
|
|
pass
|
|
q.put("last")
|
|
self.assertTrue(qfull(q), "Queue should be full")
|
|
# Test a failing blocking put
|
|
q.fail_next_put = True
|
|
try:
|
|
self.do_blocking_test(q.put, ("full",), q.get, ())
|
|
self.fail("The queue didn't fail when it should have")
|
|
except FailingQueueException:
|
|
pass
|
|
# Check the Queue isn't damaged.
|
|
# put failed, but get succeeded - re-add
|
|
q.put("last")
|
|
# Test a failing timeout put
|
|
q.fail_next_put = True
|
|
try:
|
|
self.do_exceptional_blocking_test(q.put, ("full", True, 10), q.get, (),
|
|
FailingQueueException)
|
|
self.fail("The queue didn't fail when it should have")
|
|
except FailingQueueException:
|
|
pass
|
|
# Check the Queue isn't damaged.
|
|
# put failed, but get succeeded - re-add
|
|
q.put("last")
|
|
self.assertTrue(qfull(q), "Queue should be full")
|
|
q.get()
|
|
self.assertTrue(not qfull(q), "Queue should not be full")
|
|
q.put("last")
|
|
self.assertTrue(qfull(q), "Queue should be full")
|
|
# Test a blocking put
|
|
self.do_blocking_test(q.put, ("full",), q.get, ())
|
|
# Empty it
|
|
for i in range(QUEUE_SIZE):
|
|
q.get()
|
|
self.assertTrue(not q.qsize(), "Queue should be empty")
|
|
q.put("first")
|
|
q.fail_next_get = True
|
|
try:
|
|
q.get()
|
|
self.fail("The queue didn't fail when it should have")
|
|
except FailingQueueException:
|
|
pass
|
|
self.assertTrue(q.qsize(), "Queue should not be empty")
|
|
q.fail_next_get = True
|
|
try:
|
|
q.get(timeout=0.1)
|
|
self.fail("The queue didn't fail when it should have")
|
|
except FailingQueueException:
|
|
pass
|
|
self.assertTrue(q.qsize(), "Queue should not be empty")
|
|
q.get()
|
|
self.assertTrue(not q.qsize(), "Queue should be empty")
|
|
q.fail_next_get = True
|
|
try:
|
|
self.do_exceptional_blocking_test(q.get, (), q.put, ('empty',),
|
|
FailingQueueException)
|
|
self.fail("The queue didn't fail when it should have")
|
|
except FailingQueueException:
|
|
pass
|
|
# put succeeded, but get failed.
|
|
self.assertTrue(q.qsize(), "Queue should not be empty")
|
|
q.get()
|
|
self.assertTrue(not q.qsize(), "Queue should be empty")
|
|
|
|
def test_failing_queue(self):
|
|
# Test to make sure a queue is functioning correctly.
|
|
# Done twice to the same instance.
|
|
q = FailingQueue(QUEUE_SIZE)
|
|
self.failing_queue_test(q)
|
|
self.failing_queue_test(q)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|