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Issue #28003: Implement PEP 525 -- Asynchronous Generators.
This commit is contained in:
Yury Selivanov
parent
b96ef55d49
commit
eb6364557f
27 changed files with 2189 additions and 96 deletions
823
Lib/test/test_asyncgen.py
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823
Lib/test/test_asyncgen.py
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@ -0,0 +1,823 @@
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import asyncio
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import inspect
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import sys
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import types
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import unittest
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from unittest import mock
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class AwaitException(Exception):
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pass
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@types.coroutine
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def awaitable(*, throw=False):
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if throw:
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yield ('throw',)
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else:
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yield ('result',)
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def run_until_complete(coro):
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exc = False
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while True:
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try:
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if exc:
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exc = False
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fut = coro.throw(AwaitException)
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else:
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fut = coro.send(None)
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except StopIteration as ex:
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return ex.args[0]
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if fut == ('throw',):
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exc = True
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def to_list(gen):
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async def iterate():
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res = []
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async for i in gen:
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res.append(i)
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return res
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return run_until_complete(iterate())
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class AsyncGenSyntaxTest(unittest.TestCase):
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def test_async_gen_syntax_01(self):
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code = '''async def foo():
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await abc
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yield from 123
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'''
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with self.assertRaisesRegex(SyntaxError, 'yield from.*inside async'):
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exec(code, {}, {})
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def test_async_gen_syntax_02(self):
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code = '''async def foo():
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yield from 123
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'''
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with self.assertRaisesRegex(SyntaxError, 'yield from.*inside async'):
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exec(code, {}, {})
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def test_async_gen_syntax_03(self):
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code = '''async def foo():
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await abc
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yield
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return 123
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'''
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with self.assertRaisesRegex(SyntaxError, 'return.*value.*async gen'):
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exec(code, {}, {})
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def test_async_gen_syntax_04(self):
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code = '''async def foo():
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yield
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return 123
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'''
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with self.assertRaisesRegex(SyntaxError, 'return.*value.*async gen'):
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exec(code, {}, {})
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def test_async_gen_syntax_05(self):
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code = '''async def foo():
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if 0:
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yield
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return 12
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'''
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with self.assertRaisesRegex(SyntaxError, 'return.*value.*async gen'):
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exec(code, {}, {})
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class AsyncGenTest(unittest.TestCase):
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def compare_generators(self, sync_gen, async_gen):
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def sync_iterate(g):
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res = []
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while True:
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try:
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res.append(g.__next__())
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except StopIteration:
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res.append('STOP')
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break
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except Exception as ex:
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res.append(str(type(ex)))
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return res
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def async_iterate(g):
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res = []
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while True:
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try:
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g.__anext__().__next__()
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except StopAsyncIteration:
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res.append('STOP')
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break
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except StopIteration as ex:
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if ex.args:
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res.append(ex.args[0])
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else:
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res.append('EMPTY StopIteration')
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break
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except Exception as ex:
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res.append(str(type(ex)))
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return res
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sync_gen_result = sync_iterate(sync_gen)
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async_gen_result = async_iterate(async_gen)
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self.assertEqual(sync_gen_result, async_gen_result)
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return async_gen_result
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def test_async_gen_iteration_01(self):
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async def gen():
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await awaitable()
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a = yield 123
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self.assertIs(a, None)
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await awaitable()
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yield 456
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await awaitable()
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yield 789
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self.assertEqual(to_list(gen()), [123, 456, 789])
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def test_async_gen_iteration_02(self):
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async def gen():
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await awaitable()
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yield 123
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await awaitable()
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g = gen()
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ai = g.__aiter__()
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self.assertEqual(ai.__anext__().__next__(), ('result',))
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try:
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ai.__anext__().__next__()
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except StopIteration as ex:
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self.assertEqual(ex.args[0], 123)
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else:
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self.fail('StopIteration was not raised')
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self.assertEqual(ai.__anext__().__next__(), ('result',))
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try:
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ai.__anext__().__next__()
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except StopAsyncIteration as ex:
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self.assertFalse(ex.args)
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else:
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self.fail('StopAsyncIteration was not raised')
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def test_async_gen_exception_03(self):
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async def gen():
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await awaitable()
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yield 123
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await awaitable(throw=True)
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yield 456
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with self.assertRaises(AwaitException):
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to_list(gen())
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def test_async_gen_exception_04(self):
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async def gen():
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await awaitable()
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yield 123
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1 / 0
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g = gen()
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ai = g.__aiter__()
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self.assertEqual(ai.__anext__().__next__(), ('result',))
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try:
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ai.__anext__().__next__()
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except StopIteration as ex:
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self.assertEqual(ex.args[0], 123)
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else:
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self.fail('StopIteration was not raised')
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with self.assertRaises(ZeroDivisionError):
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ai.__anext__().__next__()
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def test_async_gen_exception_05(self):
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async def gen():
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yield 123
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raise StopAsyncIteration
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with self.assertRaisesRegex(RuntimeError,
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'async generator.*StopAsyncIteration'):
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to_list(gen())
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def test_async_gen_exception_06(self):
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async def gen():
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yield 123
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raise StopIteration
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with self.assertRaisesRegex(RuntimeError,
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'async generator.*StopIteration'):
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to_list(gen())
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def test_async_gen_exception_07(self):
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def sync_gen():
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try:
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yield 1
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1 / 0
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finally:
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yield 2
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yield 3
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yield 100
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async def async_gen():
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try:
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yield 1
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1 / 0
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finally:
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yield 2
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yield 3
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yield 100
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self.compare_generators(sync_gen(), async_gen())
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def test_async_gen_exception_08(self):
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def sync_gen():
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try:
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yield 1
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finally:
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yield 2
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1 / 0
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yield 3
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yield 100
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async def async_gen():
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try:
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yield 1
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await awaitable()
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finally:
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await awaitable()
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yield 2
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1 / 0
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yield 3
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yield 100
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self.compare_generators(sync_gen(), async_gen())
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def test_async_gen_exception_09(self):
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def sync_gen():
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try:
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yield 1
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1 / 0
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finally:
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yield 2
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yield 3
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yield 100
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async def async_gen():
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try:
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await awaitable()
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yield 1
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1 / 0
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finally:
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yield 2
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await awaitable()
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yield 3
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yield 100
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self.compare_generators(sync_gen(), async_gen())
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def test_async_gen_exception_10(self):
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async def gen():
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yield 123
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with self.assertRaisesRegex(TypeError,
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"non-None value .* async generator"):
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gen().__anext__().send(100)
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def test_async_gen_api_01(self):
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async def gen():
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yield 123
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g = gen()
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self.assertEqual(g.__name__, 'gen')
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g.__name__ = '123'
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self.assertEqual(g.__name__, '123')
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self.assertIn('.gen', g.__qualname__)
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g.__qualname__ = '123'
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self.assertEqual(g.__qualname__, '123')
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self.assertIsNone(g.ag_await)
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self.assertIsInstance(g.ag_frame, types.FrameType)
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self.assertFalse(g.ag_running)
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self.assertIsInstance(g.ag_code, types.CodeType)
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self.assertTrue(inspect.isawaitable(g.aclose()))
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class AsyncGenAsyncioTest(unittest.TestCase):
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def setUp(self):
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self.loop = asyncio.new_event_loop()
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asyncio.set_event_loop(None)
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def tearDown(self):
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self.loop.close()
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self.loop = None
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async def to_list(self, gen):
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res = []
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async for i in gen:
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res.append(i)
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return res
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def test_async_gen_asyncio_01(self):
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async def gen():
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yield 1
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await asyncio.sleep(0.01, loop=self.loop)
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yield 2
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await asyncio.sleep(0.01, loop=self.loop)
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return
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yield 3
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res = self.loop.run_until_complete(self.to_list(gen()))
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self.assertEqual(res, [1, 2])
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def test_async_gen_asyncio_02(self):
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async def gen():
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yield 1
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await asyncio.sleep(0.01, loop=self.loop)
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yield 2
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1 / 0
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yield 3
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with self.assertRaises(ZeroDivisionError):
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self.loop.run_until_complete(self.to_list(gen()))
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def test_async_gen_asyncio_03(self):
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loop = self.loop
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class Gen:
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async def __aiter__(self):
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yield 1
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await asyncio.sleep(0.01, loop=loop)
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yield 2
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res = loop.run_until_complete(self.to_list(Gen()))
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self.assertEqual(res, [1, 2])
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def test_async_gen_asyncio_anext_04(self):
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async def foo():
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yield 1
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await asyncio.sleep(0.01, loop=self.loop)
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try:
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yield 2
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yield 3
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except ZeroDivisionError:
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yield 1000
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await asyncio.sleep(0.01, loop=self.loop)
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yield 4
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async def run1():
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it = foo().__aiter__()
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self.assertEqual(await it.__anext__(), 1)
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self.assertEqual(await it.__anext__(), 2)
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self.assertEqual(await it.__anext__(), 3)
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self.assertEqual(await it.__anext__(), 4)
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with self.assertRaises(StopAsyncIteration):
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await it.__anext__()
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with self.assertRaises(StopAsyncIteration):
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await it.__anext__()
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async def run2():
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it = foo().__aiter__()
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self.assertEqual(await it.__anext__(), 1)
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self.assertEqual(await it.__anext__(), 2)
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try:
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it.__anext__().throw(ZeroDivisionError)
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except StopIteration as ex:
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self.assertEqual(ex.args[0], 1000)
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else:
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self.fail('StopIteration was not raised')
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self.assertEqual(await it.__anext__(), 4)
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with self.assertRaises(StopAsyncIteration):
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await it.__anext__()
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self.loop.run_until_complete(run1())
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self.loop.run_until_complete(run2())
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def test_async_gen_asyncio_anext_05(self):
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async def foo():
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v = yield 1
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v = yield v
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yield v * 100
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async def run():
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it = foo().__aiter__()
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try:
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it.__anext__().send(None)
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except StopIteration as ex:
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self.assertEqual(ex.args[0], 1)
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else:
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self.fail('StopIteration was not raised')
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try:
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it.__anext__().send(10)
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except StopIteration as ex:
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self.assertEqual(ex.args[0], 10)
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else:
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self.fail('StopIteration was not raised')
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try:
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it.__anext__().send(12)
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except StopIteration as ex:
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self.assertEqual(ex.args[0], 1200)
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else:
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self.fail('StopIteration was not raised')
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with self.assertRaises(StopAsyncIteration):
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await it.__anext__()
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self.loop.run_until_complete(run())
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def test_async_gen_asyncio_aclose_06(self):
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async def foo():
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try:
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yield 1
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1 / 0
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finally:
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await asyncio.sleep(0.01, loop=self.loop)
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yield 12
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async def run():
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gen = foo()
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it = gen.__aiter__()
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await it.__anext__()
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await gen.aclose()
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with self.assertRaisesRegex(
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RuntimeError,
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"async generator ignored GeneratorExit"):
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self.loop.run_until_complete(run())
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def test_async_gen_asyncio_aclose_07(self):
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DONE = 0
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async def foo():
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nonlocal DONE
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try:
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yield 1
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1 / 0
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finally:
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await asyncio.sleep(0.01, loop=self.loop)
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await asyncio.sleep(0.01, loop=self.loop)
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DONE += 1
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DONE += 1000
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|
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async def run():
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gen = foo()
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it = gen.__aiter__()
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await it.__anext__()
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await gen.aclose()
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self.loop.run_until_complete(run())
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self.assertEqual(DONE, 1)
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|
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def test_async_gen_asyncio_aclose_08(self):
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DONE = 0
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|
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fut = asyncio.Future(loop=self.loop)
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|
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async def foo():
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nonlocal DONE
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try:
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yield 1
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await fut
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DONE += 1000
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yield 2
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finally:
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await asyncio.sleep(0.01, loop=self.loop)
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await asyncio.sleep(0.01, loop=self.loop)
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DONE += 1
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DONE += 1000
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async def run():
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gen = foo()
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it = gen.__aiter__()
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self.assertEqual(await it.__anext__(), 1)
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t = self.loop.create_task(it.__anext__())
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await asyncio.sleep(0.01, loop=self.loop)
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await gen.aclose()
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return t
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t = self.loop.run_until_complete(run())
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self.assertEqual(DONE, 1)
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# Silence ResourceWarnings
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fut.cancel()
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t.cancel()
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self.loop.run_until_complete(asyncio.sleep(0.01, loop=self.loop))
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def test_async_gen_asyncio_gc_aclose_09(self):
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DONE = 0
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async def gen():
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nonlocal DONE
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try:
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while True:
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yield 1
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finally:
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await asyncio.sleep(0.01, loop=self.loop)
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await asyncio.sleep(0.01, loop=self.loop)
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DONE = 1
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async def run():
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g = gen()
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await g.__anext__()
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await g.__anext__()
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del g
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await asyncio.sleep(0.1, loop=self.loop)
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self.loop.run_until_complete(run())
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self.assertEqual(DONE, 1)
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def test_async_gen_asyncio_asend_01(self):
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DONE = 0
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# Sanity check:
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def sgen():
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v = yield 1
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yield v * 2
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sg = sgen()
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v = sg.send(None)
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self.assertEqual(v, 1)
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v = sg.send(100)
|
||||
self.assertEqual(v, 200)
|
||||
|
||||
async def gen():
|
||||
nonlocal DONE
|
||||
try:
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
v = yield 1
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
yield v * 2
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
return
|
||||
finally:
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
DONE = 1
|
||||
|
||||
async def run():
|
||||
g = gen()
|
||||
|
||||
v = await g.asend(None)
|
||||
self.assertEqual(v, 1)
|
||||
|
||||
v = await g.asend(100)
|
||||
self.assertEqual(v, 200)
|
||||
|
||||
with self.assertRaises(StopAsyncIteration):
|
||||
await g.asend(None)
|
||||
|
||||
self.loop.run_until_complete(run())
|
||||
self.assertEqual(DONE, 1)
|
||||
|
||||
def test_async_gen_asyncio_asend_02(self):
|
||||
DONE = 0
|
||||
|
||||
async def sleep_n_crash(delay):
|
||||
await asyncio.sleep(delay, loop=self.loop)
|
||||
1 / 0
|
||||
|
||||
async def gen():
|
||||
nonlocal DONE
|
||||
try:
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
v = yield 1
|
||||
await sleep_n_crash(0.01)
|
||||
DONE += 1000
|
||||
yield v * 2
|
||||
finally:
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
DONE = 1
|
||||
|
||||
async def run():
|
||||
g = gen()
|
||||
|
||||
v = await g.asend(None)
|
||||
self.assertEqual(v, 1)
|
||||
|
||||
await g.asend(100)
|
||||
|
||||
with self.assertRaises(ZeroDivisionError):
|
||||
self.loop.run_until_complete(run())
|
||||
self.assertEqual(DONE, 1)
|
||||
|
||||
def test_async_gen_asyncio_asend_03(self):
|
||||
DONE = 0
|
||||
|
||||
async def sleep_n_crash(delay):
|
||||
fut = asyncio.ensure_future(asyncio.sleep(delay, loop=self.loop),
|
||||
loop=self.loop)
|
||||
self.loop.call_later(delay / 2, lambda: fut.cancel())
|
||||
return await fut
|
||||
|
||||
async def gen():
|
||||
nonlocal DONE
|
||||
try:
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
v = yield 1
|
||||
await sleep_n_crash(0.01)
|
||||
DONE += 1000
|
||||
yield v * 2
|
||||
finally:
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
DONE = 1
|
||||
|
||||
async def run():
|
||||
g = gen()
|
||||
|
||||
v = await g.asend(None)
|
||||
self.assertEqual(v, 1)
|
||||
|
||||
await g.asend(100)
|
||||
|
||||
with self.assertRaises(asyncio.CancelledError):
|
||||
self.loop.run_until_complete(run())
|
||||
self.assertEqual(DONE, 1)
|
||||
|
||||
def test_async_gen_asyncio_athrow_01(self):
|
||||
DONE = 0
|
||||
|
||||
class FooEr(Exception):
|
||||
pass
|
||||
|
||||
# Sanity check:
|
||||
def sgen():
|
||||
try:
|
||||
v = yield 1
|
||||
except FooEr:
|
||||
v = 1000
|
||||
yield v * 2
|
||||
sg = sgen()
|
||||
v = sg.send(None)
|
||||
self.assertEqual(v, 1)
|
||||
v = sg.throw(FooEr)
|
||||
self.assertEqual(v, 2000)
|
||||
with self.assertRaises(StopIteration):
|
||||
sg.send(None)
|
||||
|
||||
async def gen():
|
||||
nonlocal DONE
|
||||
try:
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
try:
|
||||
v = yield 1
|
||||
except FooEr:
|
||||
v = 1000
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
yield v * 2
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
# return
|
||||
finally:
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
DONE = 1
|
||||
|
||||
async def run():
|
||||
g = gen()
|
||||
|
||||
v = await g.asend(None)
|
||||
self.assertEqual(v, 1)
|
||||
|
||||
v = await g.athrow(FooEr)
|
||||
self.assertEqual(v, 2000)
|
||||
|
||||
with self.assertRaises(StopAsyncIteration):
|
||||
await g.asend(None)
|
||||
|
||||
self.loop.run_until_complete(run())
|
||||
self.assertEqual(DONE, 1)
|
||||
|
||||
def test_async_gen_asyncio_athrow_02(self):
|
||||
DONE = 0
|
||||
|
||||
class FooEr(Exception):
|
||||
pass
|
||||
|
||||
async def sleep_n_crash(delay):
|
||||
fut = asyncio.ensure_future(asyncio.sleep(delay, loop=self.loop),
|
||||
loop=self.loop)
|
||||
self.loop.call_later(delay / 2, lambda: fut.cancel())
|
||||
return await fut
|
||||
|
||||
async def gen():
|
||||
nonlocal DONE
|
||||
try:
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
try:
|
||||
v = yield 1
|
||||
except FooEr:
|
||||
await sleep_n_crash(0.01)
|
||||
yield v * 2
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
# return
|
||||
finally:
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
await asyncio.sleep(0.01, loop=self.loop)
|
||||
DONE = 1
|
||||
|
||||
async def run():
|
||||
g = gen()
|
||||
|
||||
v = await g.asend(None)
|
||||
self.assertEqual(v, 1)
|
||||
|
||||
try:
|
||||
await g.athrow(FooEr)
|
||||
except asyncio.CancelledError:
|
||||
self.assertEqual(DONE, 1)
|
||||
raise
|
||||
else:
|
||||
self.fail('CancelledError was not raised')
|
||||
|
||||
with self.assertRaises(asyncio.CancelledError):
|
||||
self.loop.run_until_complete(run())
|
||||
self.assertEqual(DONE, 1)
|
||||
|
||||
def test_async_gen_asyncio_shutdown_01(self):
|
||||
finalized = 0
|
||||
|
||||
async def waiter(timeout):
|
||||
nonlocal finalized
|
||||
try:
|
||||
await asyncio.sleep(timeout, loop=self.loop)
|
||||
yield 1
|
||||
finally:
|
||||
await asyncio.sleep(0, loop=self.loop)
|
||||
finalized += 1
|
||||
|
||||
async def wait():
|
||||
async for _ in waiter(1):
|
||||
pass
|
||||
|
||||
t1 = self.loop.create_task(wait())
|
||||
t2 = self.loop.create_task(wait())
|
||||
|
||||
self.loop.run_until_complete(asyncio.sleep(0.1, loop=self.loop))
|
||||
|
||||
self.loop.run_until_complete(self.loop.shutdown_asyncgens())
|
||||
self.assertEqual(finalized, 2)
|
||||
|
||||
# Silence warnings
|
||||
t1.cancel()
|
||||
t2.cancel()
|
||||
self.loop.run_until_complete(asyncio.sleep(0.1, loop=self.loop))
|
||||
|
||||
def test_async_gen_asyncio_shutdown_02(self):
|
||||
logged = 0
|
||||
|
||||
def logger(loop, context):
|
||||
nonlocal logged
|
||||
self.assertIn('asyncgen', context)
|
||||
expected = 'an error occurred during closing of asynchronous'
|
||||
if expected in context['message']:
|
||||
logged += 1
|
||||
|
||||
async def waiter(timeout):
|
||||
try:
|
||||
await asyncio.sleep(timeout, loop=self.loop)
|
||||
yield 1
|
||||
finally:
|
||||
1 / 0
|
||||
|
||||
async def wait():
|
||||
async for _ in waiter(1):
|
||||
pass
|
||||
|
||||
t = self.loop.create_task(wait())
|
||||
self.loop.run_until_complete(asyncio.sleep(0.1, loop=self.loop))
|
||||
|
||||
self.loop.set_exception_handler(logger)
|
||||
self.loop.run_until_complete(self.loop.shutdown_asyncgens())
|
||||
|
||||
self.assertEqual(logged, 1)
|
||||
|
||||
# Silence warnings
|
||||
t.cancel()
|
||||
self.loop.run_until_complete(asyncio.sleep(0.1, loop=self.loop))
|
||||
|
||||
if __name__ == "__main__":
|
||||
unittest.main()
|
||||
Loading…
Add table
Add a link
Reference in a new issue