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#
# Copyright 2012 Facebook
#
# 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 concurrent import futures
import logging
import re
import socket
import typing
import unittest
from tornado.concurrent import (
Future,
run_on_executor,
future_set_result_unless_cancelled,
)
from tornado.escape import utf8, to_unicode
from tornado import gen
from tornado.iostream import IOStream
from tornado.tcpserver import TCPServer
from tornado.testing import AsyncTestCase, bind_unused_port, gen_test
class MiscFutureTest(AsyncTestCase):
def test_future_set_result_unless_cancelled(self):
fut = Future() # type: Future[int]
future_set_result_unless_cancelled(fut, 42)
self.assertEqual(fut.result(), 42)
self.assertFalse(fut.cancelled())
fut = Future()
fut.cancel()
is_cancelled = fut.cancelled()
future_set_result_unless_cancelled(fut, 42)
self.assertEqual(fut.cancelled(), is_cancelled)
if not is_cancelled:
self.assertEqual(fut.result(), 42)
# The following series of classes demonstrate and test various styles
# of use, with and without generators and futures.
class CapServer(TCPServer):
@gen.coroutine
def handle_stream(self, stream, address):
data = yield stream.read_until(b"\n")
data = to_unicode(data)
if data == data.upper():
stream.write(b"error\talready capitalized\n")
else:
# data already has \n
stream.write(utf8("ok\t%s" % data.upper()))
stream.close()
class CapError(Exception):
pass
class BaseCapClient(object):
def __init__(self, port):
self.port = port
def process_response(self, data):
m = re.match("(.*)\t(.*)\n", to_unicode(data))
if m is None:
raise Exception("did not match")
status, message = m.groups()
if status == "ok":
return message
else:
raise CapError(message)
class GeneratorCapClient(BaseCapClient):
@gen.coroutine
def capitalize(self, request_data):
logging.debug("capitalize")
stream = IOStream(socket.socket())
logging.debug("connecting")
yield stream.connect(("127.0.0.1", self.port))
stream.write(utf8(request_data + "\n"))
logging.debug("reading")
data = yield stream.read_until(b"\n")
logging.debug("returning")
stream.close()
raise gen.Return(self.process_response(data))
class ClientTestMixin(object):
client_class = None # type: typing.Callable
def setUp(self):
super().setUp() # type: ignore
self.server = CapServer()
sock, port = bind_unused_port()
self.server.add_sockets([sock])
self.client = self.client_class(port=port)
def tearDown(self):
self.server.stop()
super().tearDown() # type: ignore
def test_future(self: typing.Any):
future = self.client.capitalize("hello")
self.io_loop.add_future(future, self.stop)
self.wait()
self.assertEqual(future.result(), "HELLO")
def test_future_error(self: typing.Any):
future = self.client.capitalize("HELLO")
self.io_loop.add_future(future, self.stop)
self.wait()
self.assertRaisesRegex(CapError, "already capitalized", future.result) # type: ignore
def test_generator(self: typing.Any):
@gen.coroutine
def f():
result = yield self.client.capitalize("hello")
self.assertEqual(result, "HELLO")
self.io_loop.run_sync(f)
def test_generator_error(self: typing.Any):
@gen.coroutine
def f():
with self.assertRaisesRegex(CapError, "already capitalized"):
yield self.client.capitalize("HELLO")
self.io_loop.run_sync(f)
class GeneratorClientTest(ClientTestMixin, AsyncTestCase):
client_class = GeneratorCapClient
class RunOnExecutorTest(AsyncTestCase):
@gen_test
def test_no_calling(self):
class Object(object):
def __init__(self):
self.executor = futures.thread.ThreadPoolExecutor(1)
@run_on_executor
def f(self):
return 42
o = Object()
answer = yield o.f()
self.assertEqual(answer, 42)
@gen_test
def test_call_with_no_args(self):
class Object(object):
def __init__(self):
self.executor = futures.thread.ThreadPoolExecutor(1)
@run_on_executor()
def f(self):
return 42
o = Object()
answer = yield o.f()
self.assertEqual(answer, 42)
@gen_test
def test_call_with_executor(self):
class Object(object):
def __init__(self):
self.__executor = futures.thread.ThreadPoolExecutor(1)
@run_on_executor(executor="_Object__executor")
def f(self):
return 42
o = Object()
answer = yield o.f()
self.assertEqual(answer, 42)
@gen_test
def test_async_await(self):
class Object(object):
def __init__(self):
self.executor = futures.thread.ThreadPoolExecutor(1)
@run_on_executor()
def f(self):
return 42
o = Object()
async def f():
answer = await o.f()
return answer
result = yield f()
self.assertEqual(result, 42)
if __name__ == "__main__":
unittest.main()
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