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import asyncio
import decimal
import random
import sys
import unittest
import weakref
from uvloop import _testbase as tb
PY37 = sys.version_info >= (3, 7, 0)
class _ContextBaseTests:
@unittest.skipUnless(PY37, 'requires Python 3.7')
def test_task_decimal_context(self):
async def fractions(t, precision, x, y):
with decimal.localcontext() as ctx:
ctx.prec = precision
a = decimal.Decimal(x) / decimal.Decimal(y)
await asyncio.sleep(t)
b = decimal.Decimal(x) / decimal.Decimal(y ** 2)
return a, b
async def main():
r1, r2 = await asyncio.gather(
fractions(0.1, 3, 1, 3), fractions(0.2, 6, 1, 3))
return r1, r2
r1, r2 = self.loop.run_until_complete(main())
self.assertEqual(str(r1[0]), '0.333')
self.assertEqual(str(r1[1]), '0.111')
self.assertEqual(str(r2[0]), '0.333333')
self.assertEqual(str(r2[1]), '0.111111')
@unittest.skipUnless(PY37, 'requires Python 3.7')
def test_task_context_1(self):
import contextvars
cvar = contextvars.ContextVar('cvar', default='nope')
async def sub():
await asyncio.sleep(0.01)
self.assertEqual(cvar.get(), 'nope')
cvar.set('something else')
async def main():
self.assertEqual(cvar.get(), 'nope')
subtask = self.loop.create_task(sub())
cvar.set('yes')
self.assertEqual(cvar.get(), 'yes')
await subtask
self.assertEqual(cvar.get(), 'yes')
task = self.loop.create_task(main())
self.loop.run_until_complete(task)
@unittest.skipUnless(PY37, 'requires Python 3.7')
def test_task_context_2(self):
import contextvars
cvar = contextvars.ContextVar('cvar', default='nope')
async def main():
def fut_on_done(fut):
# This change must not pollute the context
# of the "main()" task.
cvar.set('something else')
self.assertEqual(cvar.get(), 'nope')
for j in range(2):
fut = self.loop.create_future()
fut.add_done_callback(fut_on_done)
cvar.set('yes{}'.format(j))
self.loop.call_soon(fut.set_result, None)
await fut
self.assertEqual(cvar.get(), 'yes{}'.format(j))
for i in range(3):
# Test that task passed its context to add_done_callback:
cvar.set('yes{}-{}'.format(i, j))
await asyncio.sleep(0.001)
self.assertEqual(cvar.get(), 'yes{}-{}'.format(i, j))
task = self.loop.create_task(main())
self.loop.run_until_complete(task)
self.assertEqual(cvar.get(), 'nope')
@unittest.skipUnless(PY37, 'requires Python 3.7')
def test_task_context_3(self):
import contextvars
cvar = contextvars.ContextVar('cvar', default=-1)
# Run 100 Tasks in parallel, each modifying cvar.
async def sub(num):
for i in range(10):
cvar.set(num + i)
await asyncio.sleep(random.uniform(0.001, 0.05))
self.assertEqual(cvar.get(), num + i)
async def main():
tasks = []
for i in range(100):
task = self.loop.create_task(sub(random.randint(0, 10)))
tasks.append(task)
await asyncio.gather(*tasks, return_exceptions=True)
self.loop.run_until_complete(main())
self.assertEqual(cvar.get(), -1)
@unittest.skipUnless(PY37, 'requires Python 3.7')
def test_task_context_4(self):
import contextvars
cvar = contextvars.ContextVar('cvar', default='nope')
class TrackMe:
pass
tracked = TrackMe()
ref = weakref.ref(tracked)
async def sub():
cvar.set(tracked) # NoQA
self.loop.call_soon(lambda: None)
async def main():
await self.loop.create_task(sub())
await asyncio.sleep(0.01)
task = self.loop.create_task(main())
self.loop.run_until_complete(task)
del tracked
self.assertIsNone(ref())
class Test_UV_Context(_ContextBaseTests, tb.UVTestCase):
@unittest.skipIf(PY37, 'requires Python <3.6')
def test_context_arg(self):
def cb():
pass
with self.assertRaisesRegex(NotImplementedError,
'requires Python 3.7'):
self.loop.call_soon(cb, context=1)
with self.assertRaisesRegex(NotImplementedError,
'requires Python 3.7'):
self.loop.call_soon_threadsafe(cb, context=1)
with self.assertRaisesRegex(NotImplementedError,
'requires Python 3.7'):
self.loop.call_later(0.1, cb, context=1)
class Test_AIO_Context(_ContextBaseTests, tb.AIOTestCase):
pass
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