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