725 lines
25 KiB
Python
725 lines
25 KiB
Python
from concurrent.futures import ThreadPoolExecutor
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from concurrent import futures
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import contextlib
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import datetime
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import functools
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import socket
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import subprocess
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import sys
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import threading
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import time
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import types
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from unittest import mock
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import unittest
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from tornado.escape import native_str
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from tornado import gen
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from tornado.ioloop import IOLoop, TimeoutError, PeriodicCallback
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from tornado.log import app_log
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from tornado.testing import AsyncTestCase, bind_unused_port, ExpectLog, gen_test
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from tornado.test.util import skipIfNonUnix, skipOnTravis
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import typing
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if typing.TYPE_CHECKING:
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from typing import List # noqa: F401
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class TestIOLoop(AsyncTestCase):
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def test_add_callback_return_sequence(self):
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# A callback returning {} or [] shouldn't spin the CPU, see Issue #1803.
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self.calls = 0
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loop = self.io_loop
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test = self
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old_add_callback = loop.add_callback
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def add_callback(self, callback, *args, **kwargs):
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test.calls += 1
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old_add_callback(callback, *args, **kwargs)
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loop.add_callback = types.MethodType(add_callback, loop) # type: ignore
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loop.add_callback(lambda: {}) # type: ignore
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loop.add_callback(lambda: []) # type: ignore
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loop.add_timeout(datetime.timedelta(milliseconds=50), loop.stop)
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loop.start()
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self.assertLess(self.calls, 10)
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@skipOnTravis
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def test_add_callback_wakeup(self):
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# Make sure that add_callback from inside a running IOLoop
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# wakes up the IOLoop immediately instead of waiting for a timeout.
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def callback():
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self.called = True
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self.stop()
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def schedule_callback():
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self.called = False
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self.io_loop.add_callback(callback)
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# Store away the time so we can check if we woke up immediately
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self.start_time = time.time()
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self.io_loop.add_timeout(self.io_loop.time(), schedule_callback)
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self.wait()
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self.assertAlmostEqual(time.time(), self.start_time, places=2)
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self.assertTrue(self.called)
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@skipOnTravis
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def test_add_callback_wakeup_other_thread(self):
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def target():
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# sleep a bit to let the ioloop go into its poll loop
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time.sleep(0.01)
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self.stop_time = time.time()
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self.io_loop.add_callback(self.stop)
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thread = threading.Thread(target=target)
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self.io_loop.add_callback(thread.start)
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self.wait()
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delta = time.time() - self.stop_time
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self.assertLess(delta, 0.1)
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thread.join()
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def test_add_timeout_timedelta(self):
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self.io_loop.add_timeout(datetime.timedelta(microseconds=1), self.stop)
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self.wait()
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def test_multiple_add(self):
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sock, port = bind_unused_port()
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try:
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self.io_loop.add_handler(
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sock.fileno(), lambda fd, events: None, IOLoop.READ
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)
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# Attempting to add the same handler twice fails
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# (with a platform-dependent exception)
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self.assertRaises(
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Exception,
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self.io_loop.add_handler,
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sock.fileno(),
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lambda fd, events: None,
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IOLoop.READ,
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)
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finally:
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self.io_loop.remove_handler(sock.fileno())
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sock.close()
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def test_remove_without_add(self):
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# remove_handler should not throw an exception if called on an fd
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# was never added.
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sock, port = bind_unused_port()
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try:
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self.io_loop.remove_handler(sock.fileno())
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finally:
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sock.close()
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def test_add_callback_from_signal(self):
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# cheat a little bit and just run this normally, since we can't
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# easily simulate the races that happen with real signal handlers
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self.io_loop.add_callback_from_signal(self.stop)
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self.wait()
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def test_add_callback_from_signal_other_thread(self):
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# Very crude test, just to make sure that we cover this case.
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# This also happens to be the first test where we run an IOLoop in
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# a non-main thread.
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other_ioloop = IOLoop()
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thread = threading.Thread(target=other_ioloop.start)
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thread.start()
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other_ioloop.add_callback_from_signal(other_ioloop.stop)
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thread.join()
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other_ioloop.close()
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def test_add_callback_while_closing(self):
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# add_callback should not fail if it races with another thread
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# closing the IOLoop. The callbacks are dropped silently
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# without executing.
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closing = threading.Event()
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def target():
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other_ioloop.add_callback(other_ioloop.stop)
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other_ioloop.start()
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closing.set()
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other_ioloop.close(all_fds=True)
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other_ioloop = IOLoop()
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thread = threading.Thread(target=target)
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thread.start()
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closing.wait()
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for i in range(1000):
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other_ioloop.add_callback(lambda: None)
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@skipIfNonUnix # just because socketpair is so convenient
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def test_read_while_writeable(self):
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# Ensure that write events don't come in while we're waiting for
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# a read and haven't asked for writeability. (the reverse is
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# difficult to test for)
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client, server = socket.socketpair()
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try:
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def handler(fd, events):
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self.assertEqual(events, IOLoop.READ)
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self.stop()
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self.io_loop.add_handler(client.fileno(), handler, IOLoop.READ)
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self.io_loop.add_timeout(
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self.io_loop.time() + 0.01, functools.partial(server.send, b"asdf") # type: ignore
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)
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self.wait()
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self.io_loop.remove_handler(client.fileno())
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finally:
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client.close()
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server.close()
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def test_remove_timeout_after_fire(self):
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# It is not an error to call remove_timeout after it has run.
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handle = self.io_loop.add_timeout(self.io_loop.time(), self.stop)
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self.wait()
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self.io_loop.remove_timeout(handle)
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def test_remove_timeout_cleanup(self):
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# Add and remove enough callbacks to trigger cleanup.
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# Not a very thorough test, but it ensures that the cleanup code
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# gets executed and doesn't blow up. This test is only really useful
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# on PollIOLoop subclasses, but it should run silently on any
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# implementation.
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for i in range(2000):
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timeout = self.io_loop.add_timeout(self.io_loop.time() + 3600, lambda: None)
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self.io_loop.remove_timeout(timeout)
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# HACK: wait two IOLoop iterations for the GC to happen.
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self.io_loop.add_callback(lambda: self.io_loop.add_callback(self.stop))
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self.wait()
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def test_remove_timeout_from_timeout(self):
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calls = [False, False]
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# Schedule several callbacks and wait for them all to come due at once.
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# t2 should be cancelled by t1, even though it is already scheduled to
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# be run before the ioloop even looks at it.
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now = self.io_loop.time()
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def t1():
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calls[0] = True
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self.io_loop.remove_timeout(t2_handle)
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self.io_loop.add_timeout(now + 0.01, t1)
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def t2():
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calls[1] = True
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t2_handle = self.io_loop.add_timeout(now + 0.02, t2)
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self.io_loop.add_timeout(now + 0.03, self.stop)
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time.sleep(0.03)
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self.wait()
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self.assertEqual(calls, [True, False])
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def test_timeout_with_arguments(self):
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# This tests that all the timeout methods pass through *args correctly.
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results = [] # type: List[int]
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self.io_loop.add_timeout(self.io_loop.time(), results.append, 1)
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self.io_loop.add_timeout(datetime.timedelta(seconds=0), results.append, 2)
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self.io_loop.call_at(self.io_loop.time(), results.append, 3)
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self.io_loop.call_later(0, results.append, 4)
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self.io_loop.call_later(0, self.stop)
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self.wait()
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# The asyncio event loop does not guarantee the order of these
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# callbacks.
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self.assertEqual(sorted(results), [1, 2, 3, 4])
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def test_add_timeout_return(self):
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# All the timeout methods return non-None handles that can be
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# passed to remove_timeout.
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handle = self.io_loop.add_timeout(self.io_loop.time(), lambda: None)
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self.assertFalse(handle is None)
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self.io_loop.remove_timeout(handle)
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def test_call_at_return(self):
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handle = self.io_loop.call_at(self.io_loop.time(), lambda: None)
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self.assertFalse(handle is None)
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self.io_loop.remove_timeout(handle)
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def test_call_later_return(self):
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handle = self.io_loop.call_later(0, lambda: None)
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self.assertFalse(handle is None)
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self.io_loop.remove_timeout(handle)
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def test_close_file_object(self):
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"""When a file object is used instead of a numeric file descriptor,
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the object should be closed (by IOLoop.close(all_fds=True),
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not just the fd.
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"""
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# Use a socket since they are supported by IOLoop on all platforms.
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# Unfortunately, sockets don't support the .closed attribute for
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# inspecting their close status, so we must use a wrapper.
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class SocketWrapper(object):
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def __init__(self, sockobj):
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self.sockobj = sockobj
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self.closed = False
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def fileno(self):
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return self.sockobj.fileno()
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def close(self):
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self.closed = True
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self.sockobj.close()
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sockobj, port = bind_unused_port()
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socket_wrapper = SocketWrapper(sockobj)
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io_loop = IOLoop()
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io_loop.add_handler(socket_wrapper, lambda fd, events: None, IOLoop.READ)
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io_loop.close(all_fds=True)
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self.assertTrue(socket_wrapper.closed)
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def test_handler_callback_file_object(self):
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"""The handler callback receives the same fd object it passed in."""
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server_sock, port = bind_unused_port()
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fds = []
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def handle_connection(fd, events):
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fds.append(fd)
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conn, addr = server_sock.accept()
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conn.close()
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self.stop()
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self.io_loop.add_handler(server_sock, handle_connection, IOLoop.READ)
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with contextlib.closing(socket.socket()) as client_sock:
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client_sock.connect(("127.0.0.1", port))
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self.wait()
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self.io_loop.remove_handler(server_sock)
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self.io_loop.add_handler(server_sock.fileno(), handle_connection, IOLoop.READ)
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with contextlib.closing(socket.socket()) as client_sock:
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client_sock.connect(("127.0.0.1", port))
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self.wait()
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self.assertIs(fds[0], server_sock)
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self.assertEqual(fds[1], server_sock.fileno())
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self.io_loop.remove_handler(server_sock.fileno())
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server_sock.close()
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def test_mixed_fd_fileobj(self):
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server_sock, port = bind_unused_port()
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def f(fd, events):
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pass
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self.io_loop.add_handler(server_sock, f, IOLoop.READ)
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with self.assertRaises(Exception):
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# The exact error is unspecified - some implementations use
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# IOError, others use ValueError.
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self.io_loop.add_handler(server_sock.fileno(), f, IOLoop.READ)
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self.io_loop.remove_handler(server_sock.fileno())
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server_sock.close()
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def test_reentrant(self):
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"""Calling start() twice should raise an error, not deadlock."""
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returned_from_start = [False]
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got_exception = [False]
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def callback():
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try:
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self.io_loop.start()
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returned_from_start[0] = True
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except Exception:
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got_exception[0] = True
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self.stop()
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self.io_loop.add_callback(callback)
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self.wait()
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self.assertTrue(got_exception[0])
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self.assertFalse(returned_from_start[0])
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def test_exception_logging(self):
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"""Uncaught exceptions get logged by the IOLoop."""
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self.io_loop.add_callback(lambda: 1 / 0)
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self.io_loop.add_callback(self.stop)
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with ExpectLog(app_log, "Exception in callback"):
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self.wait()
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def test_exception_logging_future(self):
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"""The IOLoop examines exceptions from Futures and logs them."""
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@gen.coroutine
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def callback():
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self.io_loop.add_callback(self.stop)
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1 / 0
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self.io_loop.add_callback(callback)
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with ExpectLog(app_log, "Exception in callback"):
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self.wait()
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def test_exception_logging_native_coro(self):
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"""The IOLoop examines exceptions from awaitables and logs them."""
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async def callback():
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# Stop the IOLoop two iterations after raising an exception
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# to give the exception time to be logged.
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self.io_loop.add_callback(self.io_loop.add_callback, self.stop)
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1 / 0
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self.io_loop.add_callback(callback)
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with ExpectLog(app_log, "Exception in callback"):
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self.wait()
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def test_spawn_callback(self):
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# Both add_callback and spawn_callback run directly on the IOLoop,
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# so their errors are logged without stopping the test.
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self.io_loop.add_callback(lambda: 1 / 0)
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self.io_loop.add_callback(self.stop)
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with ExpectLog(app_log, "Exception in callback"):
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self.wait()
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# A spawned callback is run directly on the IOLoop, so it will be
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# logged without stopping the test.
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self.io_loop.spawn_callback(lambda: 1 / 0)
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self.io_loop.add_callback(self.stop)
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with ExpectLog(app_log, "Exception in callback"):
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self.wait()
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@skipIfNonUnix
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def test_remove_handler_from_handler(self):
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# Create two sockets with simultaneous read events.
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client, server = socket.socketpair()
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try:
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client.send(b"abc")
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server.send(b"abc")
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# After reading from one fd, remove the other from the IOLoop.
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chunks = []
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def handle_read(fd, events):
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chunks.append(fd.recv(1024))
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if fd is client:
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self.io_loop.remove_handler(server)
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else:
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self.io_loop.remove_handler(client)
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self.io_loop.add_handler(client, handle_read, self.io_loop.READ)
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self.io_loop.add_handler(server, handle_read, self.io_loop.READ)
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self.io_loop.call_later(0.1, self.stop)
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self.wait()
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# Only one fd was read; the other was cleanly removed.
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self.assertEqual(chunks, [b"abc"])
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finally:
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client.close()
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server.close()
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@skipIfNonUnix
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@gen_test
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def test_init_close_race(self):
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# Regression test for #2367
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#
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# Skipped on windows because of what looks like a bug in the
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# proactor event loop when started and stopped on non-main
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# threads.
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def f():
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for i in range(10):
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loop = IOLoop()
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loop.close()
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yield gen.multi([self.io_loop.run_in_executor(None, f) for i in range(2)])
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# Deliberately not a subclass of AsyncTestCase so the IOLoop isn't
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# automatically set as current.
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class TestIOLoopCurrent(unittest.TestCase):
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def setUp(self):
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self.io_loop = None # type: typing.Optional[IOLoop]
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IOLoop.clear_current()
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def tearDown(self):
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if self.io_loop is not None:
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self.io_loop.close()
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def test_default_current(self):
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self.io_loop = IOLoop()
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# The first IOLoop with default arguments is made current.
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self.assertIs(self.io_loop, IOLoop.current())
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# A second IOLoop can be created but is not made current.
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io_loop2 = IOLoop()
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self.assertIs(self.io_loop, IOLoop.current())
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io_loop2.close()
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def test_non_current(self):
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self.io_loop = IOLoop(make_current=False)
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# The new IOLoop is not initially made current.
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self.assertIsNone(IOLoop.current(instance=False))
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# Starting the IOLoop makes it current, and stopping the loop
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# makes it non-current. This process is repeatable.
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for i in range(3):
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def f():
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self.current_io_loop = IOLoop.current()
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assert self.io_loop is not None
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self.io_loop.stop()
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self.io_loop.add_callback(f)
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self.io_loop.start()
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self.assertIs(self.current_io_loop, self.io_loop)
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# Now that the loop is stopped, it is no longer current.
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self.assertIsNone(IOLoop.current(instance=False))
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def test_force_current(self):
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self.io_loop = IOLoop(make_current=True)
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self.assertIs(self.io_loop, IOLoop.current())
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with self.assertRaises(RuntimeError):
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# A second make_current=True construction cannot succeed.
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IOLoop(make_current=True)
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# current() was not affected by the failed construction.
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self.assertIs(self.io_loop, IOLoop.current())
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class TestIOLoopCurrentAsync(AsyncTestCase):
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@gen_test
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def test_clear_without_current(self):
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# If there is no current IOLoop, clear_current is a no-op (but
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# should not fail). Use a thread so we see the threading.Local
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# in a pristine state.
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with ThreadPoolExecutor(1) as e:
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yield e.submit(IOLoop.clear_current)
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class TestIOLoopFutures(AsyncTestCase):
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def test_add_future_threads(self):
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with futures.ThreadPoolExecutor(1) as pool:
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def dummy():
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pass
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self.io_loop.add_future(
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pool.submit(dummy), lambda future: self.stop(future)
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)
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future = self.wait()
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self.assertTrue(future.done())
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self.assertTrue(future.result() is None)
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@gen_test
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def test_run_in_executor_gen(self):
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event1 = threading.Event()
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event2 = threading.Event()
|
|
|
|
def sync_func(self_event, other_event):
|
|
self_event.set()
|
|
other_event.wait()
|
|
# Note that return value doesn't actually do anything,
|
|
# it is just passed through to our final assertion to
|
|
# make sure it is passed through properly.
|
|
return self_event
|
|
|
|
# Run two synchronous functions, which would deadlock if not
|
|
# run in parallel.
|
|
res = yield [
|
|
IOLoop.current().run_in_executor(None, sync_func, event1, event2),
|
|
IOLoop.current().run_in_executor(None, sync_func, event2, event1),
|
|
]
|
|
|
|
self.assertEqual([event1, event2], res)
|
|
|
|
@gen_test
|
|
def test_run_in_executor_native(self):
|
|
event1 = threading.Event()
|
|
event2 = threading.Event()
|
|
|
|
def sync_func(self_event, other_event):
|
|
self_event.set()
|
|
other_event.wait()
|
|
return self_event
|
|
|
|
# Go through an async wrapper to ensure that the result of
|
|
# run_in_executor works with await and not just gen.coroutine
|
|
# (simply passing the underlying concurrent future would do that).
|
|
async def async_wrapper(self_event, other_event):
|
|
return await IOLoop.current().run_in_executor(
|
|
None, sync_func, self_event, other_event
|
|
)
|
|
|
|
res = yield [async_wrapper(event1, event2), async_wrapper(event2, event1)]
|
|
|
|
self.assertEqual([event1, event2], res)
|
|
|
|
@gen_test
|
|
def test_set_default_executor(self):
|
|
count = [0]
|
|
|
|
class MyExecutor(futures.ThreadPoolExecutor):
|
|
def submit(self, func, *args):
|
|
count[0] += 1
|
|
return super().submit(func, *args)
|
|
|
|
event = threading.Event()
|
|
|
|
def sync_func():
|
|
event.set()
|
|
|
|
executor = MyExecutor(1)
|
|
loop = IOLoop.current()
|
|
loop.set_default_executor(executor)
|
|
yield loop.run_in_executor(None, sync_func)
|
|
self.assertEqual(1, count[0])
|
|
self.assertTrue(event.is_set())
|
|
|
|
|
|
class TestIOLoopRunSync(unittest.TestCase):
|
|
def setUp(self):
|
|
self.io_loop = IOLoop()
|
|
|
|
def tearDown(self):
|
|
self.io_loop.close()
|
|
|
|
def test_sync_result(self):
|
|
with self.assertRaises(gen.BadYieldError):
|
|
self.io_loop.run_sync(lambda: 42)
|
|
|
|
def test_sync_exception(self):
|
|
with self.assertRaises(ZeroDivisionError):
|
|
self.io_loop.run_sync(lambda: 1 / 0)
|
|
|
|
def test_async_result(self):
|
|
@gen.coroutine
|
|
def f():
|
|
yield gen.moment
|
|
raise gen.Return(42)
|
|
|
|
self.assertEqual(self.io_loop.run_sync(f), 42)
|
|
|
|
def test_async_exception(self):
|
|
@gen.coroutine
|
|
def f():
|
|
yield gen.moment
|
|
1 / 0
|
|
|
|
with self.assertRaises(ZeroDivisionError):
|
|
self.io_loop.run_sync(f)
|
|
|
|
def test_current(self):
|
|
def f():
|
|
self.assertIs(IOLoop.current(), self.io_loop)
|
|
|
|
self.io_loop.run_sync(f)
|
|
|
|
def test_timeout(self):
|
|
@gen.coroutine
|
|
def f():
|
|
yield gen.sleep(1)
|
|
|
|
self.assertRaises(TimeoutError, self.io_loop.run_sync, f, timeout=0.01)
|
|
|
|
def test_native_coroutine(self):
|
|
@gen.coroutine
|
|
def f1():
|
|
yield gen.moment
|
|
|
|
async def f2():
|
|
await f1()
|
|
|
|
self.io_loop.run_sync(f2)
|
|
|
|
|
|
class TestPeriodicCallbackMath(unittest.TestCase):
|
|
def simulate_calls(self, pc, durations):
|
|
"""Simulate a series of calls to the PeriodicCallback.
|
|
|
|
Pass a list of call durations in seconds (negative values
|
|
work to simulate clock adjustments during the call, or more or
|
|
less equivalently, between calls). This method returns the
|
|
times at which each call would be made.
|
|
"""
|
|
calls = []
|
|
now = 1000
|
|
pc._next_timeout = now
|
|
for d in durations:
|
|
pc._update_next(now)
|
|
calls.append(pc._next_timeout)
|
|
now = pc._next_timeout + d
|
|
return calls
|
|
|
|
def dummy(self):
|
|
pass
|
|
|
|
def test_basic(self):
|
|
pc = PeriodicCallback(self.dummy, 10000)
|
|
self.assertEqual(
|
|
self.simulate_calls(pc, [0] * 5), [1010, 1020, 1030, 1040, 1050]
|
|
)
|
|
|
|
def test_overrun(self):
|
|
# If a call runs for too long, we skip entire cycles to get
|
|
# back on schedule.
|
|
call_durations = [9, 9, 10, 11, 20, 20, 35, 35, 0, 0, 0]
|
|
expected = [
|
|
1010,
|
|
1020,
|
|
1030, # first 3 calls on schedule
|
|
1050,
|
|
1070, # next 2 delayed one cycle
|
|
1100,
|
|
1130, # next 2 delayed 2 cycles
|
|
1170,
|
|
1210, # next 2 delayed 3 cycles
|
|
1220,
|
|
1230, # then back on schedule.
|
|
]
|
|
|
|
pc = PeriodicCallback(self.dummy, 10000)
|
|
self.assertEqual(self.simulate_calls(pc, call_durations), expected)
|
|
|
|
def test_clock_backwards(self):
|
|
pc = PeriodicCallback(self.dummy, 10000)
|
|
# Backwards jumps are ignored, potentially resulting in a
|
|
# slightly slow schedule (although we assume that when
|
|
# time.time() and time.monotonic() are different, time.time()
|
|
# is getting adjusted by NTP and is therefore more accurate)
|
|
self.assertEqual(
|
|
self.simulate_calls(pc, [-2, -1, -3, -2, 0]), [1010, 1020, 1030, 1040, 1050]
|
|
)
|
|
|
|
# For big jumps, we should perhaps alter the schedule, but we
|
|
# don't currently. This trace shows that we run callbacks
|
|
# every 10s of time.time(), but the first and second calls are
|
|
# 110s of real time apart because the backwards jump is
|
|
# ignored.
|
|
self.assertEqual(self.simulate_calls(pc, [-100, 0, 0]), [1010, 1020, 1030])
|
|
|
|
def test_jitter(self):
|
|
random_times = [0.5, 1, 0, 0.75]
|
|
expected = [1010, 1022.5, 1030, 1041.25]
|
|
call_durations = [0] * len(random_times)
|
|
pc = PeriodicCallback(self.dummy, 10000, jitter=0.5)
|
|
|
|
def mock_random():
|
|
return random_times.pop(0)
|
|
|
|
with mock.patch("random.random", mock_random):
|
|
self.assertEqual(self.simulate_calls(pc, call_durations), expected)
|
|
|
|
|
|
class TestIOLoopConfiguration(unittest.TestCase):
|
|
def run_python(self, *statements):
|
|
stmt_list = [
|
|
"from tornado.ioloop import IOLoop",
|
|
"classname = lambda x: x.__class__.__name__",
|
|
] + list(statements)
|
|
args = [sys.executable, "-c", "; ".join(stmt_list)]
|
|
return native_str(subprocess.check_output(args)).strip()
|
|
|
|
def test_default(self):
|
|
# When asyncio is available, it is used by default.
|
|
cls = self.run_python("print(classname(IOLoop.current()))")
|
|
self.assertEqual(cls, "AsyncIOMainLoop")
|
|
cls = self.run_python("print(classname(IOLoop()))")
|
|
self.assertEqual(cls, "AsyncIOLoop")
|
|
|
|
def test_asyncio(self):
|
|
cls = self.run_python(
|
|
'IOLoop.configure("tornado.platform.asyncio.AsyncIOLoop")',
|
|
"print(classname(IOLoop.current()))",
|
|
)
|
|
self.assertEqual(cls, "AsyncIOMainLoop")
|
|
|
|
def test_asyncio_main(self):
|
|
cls = self.run_python(
|
|
"from tornado.platform.asyncio import AsyncIOMainLoop",
|
|
"AsyncIOMainLoop().install()",
|
|
"print(classname(IOLoop.current()))",
|
|
)
|
|
self.assertEqual(cls, "AsyncIOMainLoop")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|