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import unittest
import asyncio
from iterators import AsyncTimeoutIterator
async def iter_simple():
yield 1
yield 2
async def iter_with_sleep():
yield 1
await asyncio.sleep(0.6)
yield 2
await asyncio.sleep(0.4)
yield 3
async def iter_with_exception():
yield 1
yield 2
raise Exception
yield 3
class TestTimeoutIterator(unittest.TestCase):
def test_normal_iteration(self):
async def _(self):
i = iter_simple()
it = AsyncTimeoutIterator(i)
self.assertEqual(await it.__anext__(), 1)
self.assertEqual(await it.__anext__(), 2)
with self.assertRaises(StopAsyncIteration):
await it.__anext__()
with self.assertRaises(StopAsyncIteration):
await it.__anext__()
asyncio.get_event_loop().run_until_complete(_(self))
def test_normal_iteration_for_loop(self):
async def _(self):
i = iter_simple()
it = AsyncTimeoutIterator(i)
iterResults = []
async for x in it:
iterResults.append(x)
self.assertEqual(iterResults, [1, 2])
asyncio.get_event_loop().run_until_complete(_(self))
def test_timeout_block(self):
async def _(self):
i = iter_with_sleep()
it = AsyncTimeoutIterator(i)
self.assertEqual(await it.__anext__(), 1)
self.assertEqual(await it.__anext__(), 2)
self.assertEqual(await it.__anext__(), 3)
with self.assertRaises(StopAsyncIteration):
await it.__anext__()
with self.assertRaises(StopAsyncIteration):
await it.__anext__()
asyncio.get_event_loop().run_until_complete(_(self))
def test_timeout_block_for_loop(self):
async def _(self):
i = iter_with_sleep()
it = AsyncTimeoutIterator(i)
iterResults = []
async for x in it:
iterResults.append(x)
self.assertEqual(iterResults, [1, 2, 3])
asyncio.get_event_loop().run_until_complete(_(self))
def test_fixed_timeout(self):
async def _(self):
i = iter_with_sleep()
it = AsyncTimeoutIterator(i, timeout=0.5)
self.assertEqual(await it.__anext__(), 1)
self.assertEqual(await it.__anext__(), it.get_sentinel())
self.assertEqual(await it.__anext__(), 2)
self.assertEqual(await it.__anext__(), 3)
with self.assertRaises(StopAsyncIteration):
await it.__anext__()
asyncio.get_event_loop().run_until_complete(_(self))
def test_fixed_timeout(self):
async def _(self):
i = iter_with_sleep()
it = AsyncTimeoutIterator(i, timeout=0.5)
iterResults = []
async for x in it:
iterResults.append(x)
self.assertEqual(iterResults, [1, it.get_sentinel(), 2, 3])
asyncio.get_event_loop().run_until_complete(_(self))
def test_timeout_update(self):
async def _(self):
i = iter_with_sleep()
it = AsyncTimeoutIterator(i, timeout=0.5)
self.assertEqual(await it.__anext__(), 1)
self.assertEqual(await it.__anext__(), it.get_sentinel())
it.set_timeout(0.3)
self.assertEqual(await it.__anext__(), 2)
self.assertEqual(await it.__anext__(), it.get_sentinel())
self.assertEqual(await it.__anext__(), 3)
with self.assertRaises(StopAsyncIteration):
await it.__anext__()
asyncio.get_event_loop().run_until_complete(_(self))
def test_custom_sentinel(self):
async def _(self):
i = iter_with_sleep()
it = AsyncTimeoutIterator(i, timeout=0.5, sentinel="END")
self.assertEqual(await it.__anext__(), 1)
self.assertEqual(await it.__anext__(), "END")
self.assertEqual(await it.__anext__(), 2)
self.assertEqual(await it.__anext__(), 3)
with self.assertRaises(StopAsyncIteration):
await it.__anext__()
asyncio.get_event_loop().run_until_complete(_(self))
def test_feature_timeout_reset(self):
async def _(self):
i = iter_with_sleep()
it = AsyncTimeoutIterator(i, timeout=0.5, reset_on_next=True)
self.assertEqual(await it.__anext__(), 1) # timeout gets reset after first iteration
self.assertEqual(await it.__anext__(), 2)
self.assertEqual(await it.__anext__(), 3)
with self.assertRaises(StopAsyncIteration):
await it.__anext__()
asyncio.get_event_loop().run_until_complete(_(self))
def test_function_set_reset_on_next(self):
async def _(self):
i = iter_with_sleep()
it = AsyncTimeoutIterator(i, timeout=0.35, reset_on_next=False)
self.assertEqual(await it.__anext__(), 1)
self.assertEqual(await it.__anext__(), it.get_sentinel())
it.set_reset_on_next(True)
self.assertEqual(await it.__anext__(), 2)
self.assertEqual(await it.__anext__(), 3)
with self.assertRaises(StopAsyncIteration):
await it.__anext__()
asyncio.get_event_loop().run_until_complete(_(self))
def test_iterator_raises_exception(self):
async def _(self):
i = iter_with_exception()
it = AsyncTimeoutIterator(i, timeout=0.5, sentinel="END")
self.assertEqual(await it.__anext__(), 1)
self.assertEqual(await it.__anext__(), 2)
with self.assertRaises(Exception):
await it.__anext__()
with self.assertRaises(StopAsyncIteration):
await it.__anext__()
asyncio.get_event_loop().run_until_complete(_(self))
def test_interrupt_thread(self):
async def _(self):
i = iter_with_sleep()
it = AsyncTimeoutIterator(i, timeout=0.5, sentinel="END")
self.assertEqual(await it.__anext__(), 1)
self.assertEqual(await it.__anext__(), it.get_sentinel())
it.interrupt()
self.assertEqual(await it.__anext__(), 2)
with self.assertRaises(StopAsyncIteration):
await it.__anext__()
asyncio.get_event_loop().run_until_complete(_(self))
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