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import eventlet
import eventlet.hubs
from tests import LimitedTestCase
class TestEvent(LimitedTestCase):
def test_waiting_for_event(self):
evt = eventlet.Event()
value = 'some stuff'
def send_to_event():
evt.send(value)
eventlet.spawn_n(send_to_event)
self.assertEqual(evt.wait(), value)
def test_multiple_waiters(self):
self._test_multiple_waiters(False)
def test_multiple_waiters_with_exception(self):
self._test_multiple_waiters(True)
def _test_multiple_waiters(self, exception):
evt = eventlet.Event()
results = []
def wait_on_event(i_am_done):
evt.wait()
results.append(True)
i_am_done.send()
if exception:
raise Exception()
waiters = []
count = 5
for i in range(count):
waiters.append(eventlet.Event())
eventlet.spawn_n(wait_on_event, waiters[-1])
eventlet.sleep() # allow spawns to start executing
evt.send()
for w in waiters:
w.wait()
self.assertEqual(len(results), count)
def test_reset(self):
evt = eventlet.Event()
# calling reset before send should throw
self.assertRaises(AssertionError, evt.reset)
value = 'some stuff'
def send_to_event():
evt.send(value)
eventlet.spawn_n(send_to_event)
self.assertEqual(evt.wait(), value)
# now try it again, and we should get the same exact value,
# and we shouldn't be allowed to resend without resetting
value2 = 'second stuff'
self.assertRaises(AssertionError, evt.send, value2)
self.assertEqual(evt.wait(), value)
# reset and everything should be happy
evt.reset()
def send_to_event2():
evt.send(value2)
eventlet.spawn_n(send_to_event2)
self.assertEqual(evt.wait(), value2)
def test_double_exception(self):
evt = eventlet.Event()
# send an exception through the event
evt.send(exc=RuntimeError('from test_double_exception'))
self.assertRaises(RuntimeError, evt.wait)
evt.reset()
# shouldn't see the RuntimeError again
eventlet.Timeout(0.001)
self.assertRaises(eventlet.Timeout, evt.wait)
def test_wait_timeout_ok():
evt = eventlet.Event()
delay = 0.1
eventlet.spawn_after(delay, evt.send, True)
t1 = eventlet.hubs.get_hub().clock()
with eventlet.Timeout(delay * 3, False):
result = evt.wait(timeout=delay * 2)
td = eventlet.hubs.get_hub().clock() - t1
assert result
assert td >= delay
def test_wait_timeout_exceed():
evt = eventlet.Event()
delay = 0.1
eventlet.spawn_after(delay * 2, evt.send, True)
t1 = eventlet.hubs.get_hub().clock()
with eventlet.Timeout(delay, False):
result = evt.wait(timeout=delay)
td = eventlet.hubs.get_hub().clock() - t1
assert not result
assert td >= delay
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