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"""Tests with-statement behavior of Timeout class."""
import gc
import sys
import time
import weakref
from eventlet import sleep
from eventlet.timeout import Timeout
from tests import LimitedTestCase
DELAY = 0.01
class Error(Exception):
pass
class Test(LimitedTestCase):
def test_cancellation(self):
# Nothing happens if with-block finishes before the timeout expires
t = Timeout(DELAY * 2)
sleep(0) # make it pending
assert t.pending, repr(t)
with t:
assert t.pending, repr(t)
sleep(DELAY)
# check if timer was actually cancelled
assert not t.pending, repr(t)
sleep(DELAY * 2)
def test_raising_self(self):
# An exception will be raised if it's not
try:
with Timeout(DELAY) as t:
sleep(DELAY * 2)
except Timeout as ex:
assert ex is t, (ex, t)
else:
raise AssertionError('must raise Timeout')
def test_raising_self_true(self):
# specifying True as the exception raises self as well
try:
with Timeout(DELAY, True) as t:
sleep(DELAY * 2)
except Timeout as ex:
assert ex is t, (ex, t)
else:
raise AssertionError('must raise Timeout')
def test_raising_custom_exception(self):
# You can customize the exception raised:
try:
with Timeout(DELAY, IOError("Operation takes way too long")):
sleep(DELAY * 2)
except IOError as ex:
assert str(ex) == "Operation takes way too long", repr(ex)
def test_raising_exception_class(self):
# Providing classes instead of values should be possible too:
try:
with Timeout(DELAY, ValueError):
sleep(DELAY * 2)
except ValueError:
pass
def test_raising_exc_tuple(self):
try:
1 // 0
except:
try:
with Timeout(DELAY, sys.exc_info()[0]):
sleep(DELAY * 2)
raise AssertionError('should not get there')
raise AssertionError('should not get there')
except ZeroDivisionError:
pass
else:
raise AssertionError('should not get there')
def test_cancel_timer_inside_block(self):
# It's possible to cancel the timer inside the block:
with Timeout(DELAY) as timer:
timer.cancel()
sleep(DELAY * 2)
def test_silent_block(self):
# To silence the exception before exiting the block, pass
# False as second parameter.
XDELAY = 0.1
start = time.time()
with Timeout(XDELAY, False):
sleep(XDELAY * 2)
delta = (time.time() - start)
assert delta < XDELAY * 2, delta
def test_dummy_timer(self):
# passing None as seconds disables the timer
with Timeout(None):
sleep(DELAY)
sleep(DELAY)
def test_ref(self):
err = Error()
err_ref = weakref.ref(err)
with Timeout(DELAY * 2, err):
sleep(DELAY)
del err
gc.collect()
assert not err_ref(), repr(err_ref())
def test_nested_timeout(self):
with Timeout(DELAY, False):
with Timeout(DELAY * 2, False):
sleep(DELAY * 3)
raise AssertionError('should not get there')
with Timeout(DELAY) as t1:
with Timeout(DELAY * 2) as t2:
try:
sleep(DELAY * 3)
except Timeout as ex:
assert ex is t1, (ex, t1)
assert not t1.pending, t1
assert t2.pending, t2
assert not t2.pending, t2
with Timeout(DELAY * 2) as t1:
with Timeout(DELAY) as t2:
try:
sleep(DELAY * 3)
except Timeout as ex:
assert ex is t2, (ex, t2)
assert t1.pending, t1
assert not t2.pending, t2
assert not t1.pending, t1
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