def Run(func, timeout, retries, args=[], kwargs={}):
"""Runs the passed function in a separate thread with timeouts and retries.
Args:
func: the function to be wrapped.
timeout: the timeout in seconds for each try.
retries: the number of retries.
args: list of positional args to pass to |func|.
kwargs: dictionary of keyword args to pass to |func|.
Returns:
The return value of func(*args, **kwargs).
"""
# The return value uses a list because Python variables are references, not
# values. Closures make a copy of the reference, so updating the closure's
# reference wouldn't update where the original reference pointed.
ret = [None]
def RunOnTimeoutThread():
ret[0] = func(*args, **kwargs)
while True:
try:
name = 'TimeoutThread-for-%s' % threading.current_thread().name
thread_group = reraiser_thread.ReraiserThreadGroup(
[reraiser_thread.ReraiserThread(RunOnTimeoutThread, name=name)])
thread_group.StartAll()
thread_group.JoinAll(watchdog_timer.WatchdogTimer(timeout))
return ret[0]
except:
if retries <= 0:
raise
retries -= 1
def testJoinTimeout(self):
def f():
pass
event = threading.Event()
def g():
event.wait()
group = reraiser_thread.ReraiserThreadGroup([
reraiser_thread.ReraiserThread(g),
reraiser_thread.ReraiserThread(f)
])
group.StartAll()
with self.assertRaises(reraiser_thread.TimeoutError):
group.JoinAll(watchdog_timer.WatchdogTimer(0.01))
event.set()
def testJoinRaise(self):
def f():
raise TestException
group = reraiser_thread.ReraiserThreadGroup(
[reraiser_thread.ReraiserThread(f) for _ in xrange(5)])
group.StartAll()
with self.assertRaises(TestException):
group.JoinAll()
def testRaise(self):
def f():
raise TestException
thread = reraiser_thread.ReraiserThread(f)
thread.start()
thread.join()
with self.assertRaises(TestException):
thread.ReraiseIfException()
def testInit(self):
ran = [False] * 5
def f(i):
ran[i] = True
group = reraiser_thread.ReraiserThreadGroup(
[reraiser_thread.ReraiserThread(f, args=[i]) for i in range(5)])
group.StartAll()
group.JoinAll()
for v in ran:
self.assertTrue(v)
def testNominal(self):
result = [None, None]
def f(a, b=None):
result[0] = a
result[1] = b
thread = reraiser_thread.ReraiserThread(f, [1], {'b': 2})
thread.start()
thread.join()
self.assertEqual(result[0], 1)
self.assertEqual(result[1], 2)
