mirror of https://github.com/python/cpython
361 lines
11 KiB
Python
361 lines
11 KiB
Python
import importlib
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import pickle
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import threading
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from textwrap import dedent
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import unittest
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import time
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from test.support import import_helper
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# Raise SkipTest if subinterpreters not supported.
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_channels = import_helper.import_module('_xxinterpchannels')
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from test.support import interpreters
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from test.support.interpreters import channels
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from .utils import _run_output, TestBase
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class LowLevelTests(TestBase):
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# The behaviors in the low-level module is important in as much
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# as it is exercised by the high-level module. Therefore the
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# most # important testing happens in the high-level tests.
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# These low-level tests cover corner cases that are not
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# encountered by the high-level module, thus they
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# mostly shouldn't matter as much.
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# Additional tests are found in Lib/test/test__xxinterpchannels.py.
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# XXX Those should be either moved to LowLevelTests or eliminated
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# in favor of high-level tests in this file.
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def test_highlevel_reloaded(self):
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# See gh-115490 (https://github.com/python/cpython/issues/115490).
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importlib.reload(channels)
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class TestChannels(TestBase):
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def test_create(self):
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r, s = channels.create()
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self.assertIsInstance(r, channels.RecvChannel)
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self.assertIsInstance(s, channels.SendChannel)
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def test_list_all(self):
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self.assertEqual(channels.list_all(), [])
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created = set()
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for _ in range(3):
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ch = channels.create()
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created.add(ch)
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after = set(channels.list_all())
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self.assertEqual(after, created)
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def test_shareable(self):
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rch, sch = channels.create()
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self.assertTrue(
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interpreters.is_shareable(rch))
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self.assertTrue(
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interpreters.is_shareable(sch))
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sch.send_nowait(rch)
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sch.send_nowait(sch)
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rch2 = rch.recv()
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sch2 = rch.recv()
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self.assertEqual(rch2, rch)
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self.assertEqual(sch2, sch)
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def test_is_closed(self):
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rch, sch = channels.create()
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rbefore = rch.is_closed
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sbefore = sch.is_closed
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rch.close()
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rafter = rch.is_closed
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safter = sch.is_closed
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self.assertFalse(rbefore)
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self.assertFalse(sbefore)
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self.assertTrue(rafter)
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self.assertTrue(safter)
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class TestRecvChannelAttrs(TestBase):
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def test_id_type(self):
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rch, _ = channels.create()
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self.assertIsInstance(rch.id, _channels.ChannelID)
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def test_custom_id(self):
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rch = channels.RecvChannel(1)
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self.assertEqual(rch.id, 1)
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with self.assertRaises(TypeError):
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channels.RecvChannel('1')
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def test_id_readonly(self):
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rch = channels.RecvChannel(1)
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with self.assertRaises(AttributeError):
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rch.id = 2
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def test_equality(self):
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ch1, _ = channels.create()
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ch2, _ = channels.create()
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self.assertEqual(ch1, ch1)
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self.assertNotEqual(ch1, ch2)
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def test_pickle(self):
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ch, _ = channels.create()
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data = pickle.dumps(ch)
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unpickled = pickle.loads(data)
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self.assertEqual(unpickled, ch)
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class TestSendChannelAttrs(TestBase):
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def test_id_type(self):
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_, sch = channels.create()
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self.assertIsInstance(sch.id, _channels.ChannelID)
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def test_custom_id(self):
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sch = channels.SendChannel(1)
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self.assertEqual(sch.id, 1)
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with self.assertRaises(TypeError):
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channels.SendChannel('1')
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def test_id_readonly(self):
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sch = channels.SendChannel(1)
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with self.assertRaises(AttributeError):
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sch.id = 2
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def test_equality(self):
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_, ch1 = channels.create()
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_, ch2 = channels.create()
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self.assertEqual(ch1, ch1)
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self.assertNotEqual(ch1, ch2)
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def test_pickle(self):
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_, ch = channels.create()
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data = pickle.dumps(ch)
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unpickled = pickle.loads(data)
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self.assertEqual(unpickled, ch)
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class TestSendRecv(TestBase):
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def test_send_recv_main(self):
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r, s = channels.create()
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orig = b'spam'
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s.send_nowait(orig)
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obj = r.recv()
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self.assertEqual(obj, orig)
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self.assertIsNot(obj, orig)
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def test_send_recv_same_interpreter(self):
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interp = interpreters.create()
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interp.exec(dedent("""
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from test.support.interpreters import channels
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r, s = channels.create()
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orig = b'spam'
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s.send_nowait(orig)
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obj = r.recv()
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assert obj == orig, 'expected: obj == orig'
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assert obj is not orig, 'expected: obj is not orig'
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"""))
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@unittest.skip('broken (see BPO-...)')
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def test_send_recv_different_interpreters(self):
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r1, s1 = channels.create()
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r2, s2 = channels.create()
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orig1 = b'spam'
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s1.send_nowait(orig1)
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out = _run_output(
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interpreters.create(),
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dedent(f"""
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obj1 = r.recv()
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assert obj1 == b'spam', 'expected: obj1 == orig1'
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# When going to another interpreter we get a copy.
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assert id(obj1) != {id(orig1)}, 'expected: obj1 is not orig1'
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orig2 = b'eggs'
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print(id(orig2))
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s.send_nowait(orig2)
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"""),
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channels=dict(r=r1, s=s2),
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)
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obj2 = r2.recv()
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self.assertEqual(obj2, b'eggs')
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self.assertNotEqual(id(obj2), int(out))
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def test_send_recv_different_threads(self):
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r, s = channels.create()
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def f():
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while True:
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try:
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obj = r.recv()
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break
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except channels.ChannelEmptyError:
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time.sleep(0.1)
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s.send(obj)
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t = threading.Thread(target=f)
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t.start()
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orig = b'spam'
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s.send(orig)
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obj = r.recv()
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t.join()
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self.assertEqual(obj, orig)
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self.assertIsNot(obj, orig)
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def test_send_recv_nowait_main(self):
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r, s = channels.create()
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orig = b'spam'
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s.send_nowait(orig)
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obj = r.recv_nowait()
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self.assertEqual(obj, orig)
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self.assertIsNot(obj, orig)
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def test_send_recv_nowait_main_with_default(self):
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r, _ = channels.create()
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obj = r.recv_nowait(None)
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self.assertIsNone(obj)
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def test_send_recv_nowait_same_interpreter(self):
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interp = interpreters.create()
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interp.exec(dedent("""
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from test.support.interpreters import channels
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r, s = channels.create()
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orig = b'spam'
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s.send_nowait(orig)
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obj = r.recv_nowait()
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assert obj == orig, 'expected: obj == orig'
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# When going back to the same interpreter we get the same object.
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assert obj is not orig, 'expected: obj is not orig'
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"""))
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@unittest.skip('broken (see BPO-...)')
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def test_send_recv_nowait_different_interpreters(self):
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r1, s1 = channels.create()
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r2, s2 = channels.create()
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orig1 = b'spam'
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s1.send_nowait(orig1)
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out = _run_output(
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interpreters.create(),
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dedent(f"""
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obj1 = r.recv_nowait()
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assert obj1 == b'spam', 'expected: obj1 == orig1'
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# When going to another interpreter we get a copy.
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assert id(obj1) != {id(orig1)}, 'expected: obj1 is not orig1'
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orig2 = b'eggs'
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print(id(orig2))
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s.send_nowait(orig2)
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"""),
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channels=dict(r=r1, s=s2),
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)
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obj2 = r2.recv_nowait()
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self.assertEqual(obj2, b'eggs')
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self.assertNotEqual(id(obj2), int(out))
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def test_recv_timeout(self):
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r, _ = channels.create()
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with self.assertRaises(TimeoutError):
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r.recv(timeout=1)
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def test_recv_channel_does_not_exist(self):
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ch = channels.RecvChannel(1_000_000)
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with self.assertRaises(channels.ChannelNotFoundError):
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ch.recv()
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def test_send_channel_does_not_exist(self):
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ch = channels.SendChannel(1_000_000)
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with self.assertRaises(channels.ChannelNotFoundError):
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ch.send(b'spam')
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def test_recv_nowait_channel_does_not_exist(self):
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ch = channels.RecvChannel(1_000_000)
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with self.assertRaises(channels.ChannelNotFoundError):
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ch.recv_nowait()
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def test_send_nowait_channel_does_not_exist(self):
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ch = channels.SendChannel(1_000_000)
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with self.assertRaises(channels.ChannelNotFoundError):
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ch.send_nowait(b'spam')
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def test_recv_nowait_empty(self):
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ch, _ = channels.create()
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with self.assertRaises(channels.ChannelEmptyError):
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ch.recv_nowait()
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def test_recv_nowait_default(self):
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default = object()
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rch, sch = channels.create()
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obj1 = rch.recv_nowait(default)
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sch.send_nowait(None)
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sch.send_nowait(1)
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sch.send_nowait(b'spam')
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sch.send_nowait(b'eggs')
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obj2 = rch.recv_nowait(default)
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obj3 = rch.recv_nowait(default)
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obj4 = rch.recv_nowait()
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obj5 = rch.recv_nowait(default)
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obj6 = rch.recv_nowait(default)
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self.assertIs(obj1, default)
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self.assertIs(obj2, None)
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self.assertEqual(obj3, 1)
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self.assertEqual(obj4, b'spam')
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self.assertEqual(obj5, b'eggs')
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self.assertIs(obj6, default)
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def test_send_buffer(self):
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buf = bytearray(b'spamspamspam')
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obj = None
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rch, sch = channels.create()
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def f():
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nonlocal obj
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while True:
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try:
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obj = rch.recv()
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break
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except channels.ChannelEmptyError:
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time.sleep(0.1)
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t = threading.Thread(target=f)
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t.start()
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sch.send_buffer(buf)
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t.join()
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self.assertIsNot(obj, buf)
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self.assertIsInstance(obj, memoryview)
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self.assertEqual(obj, buf)
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buf[4:8] = b'eggs'
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self.assertEqual(obj, buf)
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obj[4:8] = b'ham.'
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self.assertEqual(obj, buf)
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def test_send_buffer_nowait(self):
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buf = bytearray(b'spamspamspam')
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rch, sch = channels.create()
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sch.send_buffer_nowait(buf)
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obj = rch.recv()
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self.assertIsNot(obj, buf)
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self.assertIsInstance(obj, memoryview)
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self.assertEqual(obj, buf)
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buf[4:8] = b'eggs'
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self.assertEqual(obj, buf)
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obj[4:8] = b'ham.'
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self.assertEqual(obj, buf)
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if __name__ == '__main__':
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# Test needs to be a package, so we can do relative imports.
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unittest.main()
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