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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from __future__ import absolute_import, division, print_function, with_statement
from tornado import gen
from tornado.testing import AsyncTestCase, gen_test
from tornado.test.util import unittest, skipBefore33, skipBefore35, exec_test
try:
from tornado.platform.asyncio import asyncio
except ImportError:
asyncio = None
else:
from tornado.platform.asyncio import AsyncIOLoop, to_asyncio_future
# This is used in dynamically-evaluated code, so silence pyflakes.
to_asyncio_future
@unittest.skipIf(asyncio is None, "asyncio module not present")
class AsyncIOLoopTest(AsyncTestCase):
def get_new_ioloop(self):
io_loop = AsyncIOLoop()
asyncio.set_event_loop(io_loop.asyncio_loop)
return io_loop
def test_asyncio_callback(self):
# Basic test that the asyncio loop is set up correctly.
asyncio.get_event_loop().call_soon(self.stop)
self.wait()
@gen_test
def test_asyncio_future(self):
# Test that we can yield an asyncio future from a tornado coroutine.
# Without 'yield from', we must wrap coroutines in asyncio.async.
x = yield asyncio.async(
asyncio.get_event_loop().run_in_executor(None, lambda: 42))
self.assertEqual(x, 42)
@skipBefore33
@gen_test
def test_asyncio_yield_from(self):
# Test that we can use asyncio coroutines with 'yield from'
# instead of asyncio.async(). This requires python 3.3 syntax.
namespace = exec_test(globals(), locals(), """
@gen.coroutine
def f():
event_loop = asyncio.get_event_loop()
x = yield from event_loop.run_in_executor(None, lambda: 42)
return x
""")
result = yield namespace['f']()
self.assertEqual(result, 42)
@skipBefore35
def test_asyncio_adapter(self):
# This test demonstrates that when using the asyncio coroutine
# runner (i.e. run_until_complete), the to_asyncio_future
# adapter is needed. No adapter is needed in the other direction,
# as demonstrated by other tests in the package.
@gen.coroutine
def tornado_coroutine():
yield gen.Task(self.io_loop.add_callback)
raise gen.Return(42)
native_coroutine_without_adapter = exec_test(globals(), locals(), """
async def native_coroutine_without_adapter():
return await tornado_coroutine()
""")["native_coroutine_without_adapter"]
native_coroutine_with_adapter = exec_test(globals(), locals(), """
async def native_coroutine_with_adapter():
return await to_asyncio_future(tornado_coroutine())
""")["native_coroutine_with_adapter"]
# Use the adapter, but two degrees from the tornado coroutine.
native_coroutine_with_adapter2 = exec_test(globals(), locals(), """
async def native_coroutine_with_adapter2():
return await to_asyncio_future(native_coroutine_without_adapter())
""")["native_coroutine_with_adapter2"]
# Tornado supports native coroutines both with and without adapters
self.assertEqual(
self.io_loop.run_sync(native_coroutine_without_adapter),
42)
self.assertEqual(
self.io_loop.run_sync(native_coroutine_with_adapter),
42)
self.assertEqual(
self.io_loop.run_sync(native_coroutine_with_adapter2),
42)
# Asyncio only supports coroutines that yield asyncio-compatible
# Futures.
with self.assertRaises(RuntimeError):
asyncio.get_event_loop().run_until_complete(
native_coroutine_without_adapter())
self.assertEqual(
asyncio.get_event_loop().run_until_complete(
native_coroutine_with_adapter()),
42)
self.assertEqual(
asyncio.get_event_loop().run_until_complete(
native_coroutine_with_adapter2()),
42)
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