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from functools import partial
from typing import Awaitable
import pytest
import asyncio
from aiostream import stream, pipe, async_, await_
from aiostream.test_utils import add_resource
@pytest.mark.asyncio
async def test_chain(assert_run, assert_cleanup):
with assert_cleanup():
xs = stream.range(5) + stream.range(5, 10)
await assert_run(xs, list(range(10)))
with assert_cleanup():
xs = stream.range(10, 15) | add_resource.pipe(1)
xs += stream.range(15, 20) | add_resource.pipe(1)
await assert_run(xs, list(range(10, 20)))
# Empty chain (issue #95)
xs = stream.chain()
await assert_run(xs, [])
class ThrowsInEquality:
def __eq__(self, other):
raise Exception("We should not reach this!")
@pytest.fixture(
params=[stream.range, partial(stream.repeat, ThrowsInEquality())],
ids=["range", "iterator_of_items_that_throw"],
)
def make_range(request):
return request.param
@pytest.mark.asyncio
async def test_zip_strict(make_range):
xs = make_range(3)
ys = make_range(2)
zs = stream.zip(xs, ys, strict=True)
with pytest.raises(ValueError, match="The provided sources have different lengths"):
await zs
@pytest.mark.asyncio
async def test_zip(assert_run):
xs = stream.range(5) | add_resource.pipe(1.0)
ys = xs | pipe.zip(xs, xs)
expected = [(x,) * 3 for x in range(5)]
await assert_run(ys, expected)
# Exceptions from iterables are propagated
xs = stream.zip(stream.range(2), stream.throw(AttributeError))
with pytest.raises(AttributeError):
await xs
# Empty zip (issue #95)
xs = stream.zip()
await assert_run(xs, [])
# Strict mode (issue #118): Iterable length mismatch raises
xs = stream.zip(stream.range(2), stream.range(1), strict=True)
with pytest.raises(ValueError):
await xs
# Strict mode (issue #118): No raise for matching-length iterables
xs = stream.zip(stream.range(2), stream.range(2), strict=True)
await assert_run(xs, [(0, 0), (1, 1)])
# Strict mode (issue #118): Exceptions from iterables are propagated
xs = stream.zip(stream.range(2), stream.throw(AttributeError), strict=True)
with pytest.raises(AttributeError):
await xs
# Strict mode (issue #118): Non-strict mode works as before
xs = stream.zip(stream.range(2), stream.range(1))
await assert_run(xs, [(0, 0)])
# Strict mode (issue #118): In particular, we stop immediately if any
# one iterable is exhausted, not waiting for the others
slow_iterable_continued_after_sleep = asyncio.Event()
async def fast_iterable():
yield 0
await asyncio.sleep(1)
async def slow_iterable():
yield 0
await asyncio.sleep(2)
slow_iterable_continued_after_sleep.set()
xs = stream.zip(fast_iterable(), slow_iterable())
await assert_run(xs, [(0, 0)])
assert not slow_iterable_continued_after_sleep.is_set()
@pytest.mark.asyncio
async def test_map(assert_run, assert_cleanup):
def square_target(arg: int, *_) -> int:
return arg**2
def sum_target(a: int, b: int, *_) -> int:
return a + b
async def sleep_only(arg: float, *_) -> None:
return await asyncio.sleep(arg)
async def sleep_and_result(arg: float, result: int, *_) -> int:
return await asyncio.sleep(arg, result)
def not_a_coro_function(arg: int, *_) -> Awaitable[int]:
return asyncio.sleep(arg, arg)
# Synchronous/simple
with assert_cleanup():
xs = stream.range(5) | pipe.map(square_target)
expected = [x**2 for x in range(5)]
await assert_run(xs, expected)
# Synchronous/multiple
with assert_cleanup():
xs = stream.range(5)
ys = xs | pipe.map(sum_target, xs)
expected = [x * 2 for x in range(5)]
await assert_run(ys, expected)
# Asynchronous/simple/concurrent
with assert_cleanup() as loop:
xs = stream.range(1, 4) | pipe.map(sleep_only)
expected = [None] * 3
await assert_run(xs, expected)
assert loop.steps == [1, 1, 1]
# Asynchronous/simple/sequential
with assert_cleanup() as loop:
xs = stream.range(1, 4) | pipe.map(sleep_only, task_limit=1)
expected = [None] * 3
await assert_run(xs, expected)
assert loop.steps == [1, 2, 3]
# Asynchronous/multiple/concurrent
with assert_cleanup() as loop:
xs = stream.range(1, 4)
ys = xs | pipe.map(sleep_and_result, xs)
await assert_run(ys, [1, 2, 3])
assert loop.steps == [1, 1, 1]
# Asynchronous/multiple/sequential
with assert_cleanup() as loop:
xs = stream.range(1, 4)
ys = xs | pipe.map(sleep_and_result, xs, task_limit=1)
await assert_run(ys, [1, 2, 3])
assert loop.steps == [1, 2, 3]
# As completed
with assert_cleanup() as loop:
xs = stream.iterate([2, 4, 1, 3, 5])
ys = xs | pipe.map(sleep_and_result, xs, ordered=False)
await assert_run(ys, [1, 2, 3, 4, 5])
assert loop.steps == [1, 1, 1, 1, 1]
# Invalid arguments
with pytest.raises(ValueError):
await (stream.range(1, 4) | pipe.map(sleep_only, task_limit=0))
with pytest.raises(ValueError):
await (stream.range(1, 4) | pipe.map(square_target, task_limit=3))
with pytest.raises(ValueError):
await (stream.range(1, 4) | pipe.map(square_target, ordered=False))
# Break
with assert_cleanup() as loop:
xs = stream.count(1)
ys = xs | pipe.map(sleep_and_result, xs, task_limit=10)
await assert_run(ys[:3], [1, 2, 3])
assert loop.steps == [1, 1, 1]
# Stuck
with assert_cleanup():
xs = stream.count(1)
ys = xs | pipe.map(sleep_and_result, xs, task_limit=1) | pipe.timeout(5)
await assert_run(ys, [1, 2, 3, 4], asyncio.TimeoutError())
# Force await
with assert_cleanup():
xs = stream.iterate([1, 2, 3])
ys = xs | pipe.map(async_(not_a_coro_function))
await assert_run(ys, [1, 2, 3])
assert loop.steps == [1, 1, 1]
# Map await_
with assert_cleanup() as loop:
xs = stream.iterate(map(lambda x: asyncio.sleep(x, x), [1, 2, 3]))
ys = xs | pipe.map(await_) # type: ignore
await assert_run(ys, [1, 2, 3])
assert loop.steps == [1, 1, 1]
@pytest.mark.asyncio
async def test_merge(assert_run, assert_cleanup):
with assert_cleanup() as loop:
xs = stream.range(1, 5, 2, interval=2) | pipe.delay(1)
ys = stream.range(0, 5, 2, interval=2) | pipe.merge(xs)
await assert_run(ys, [0, 1, 2, 3, 4])
assert loop.steps == [1, 1, 1, 1]
with assert_cleanup():
xs = stream.range(1, 5, 2, interval=2) | pipe.delay(1)
ys = stream.range(0, 5, 2, interval=2) | pipe.merge(xs)
await assert_run(ys[:3], [0, 1, 2])
assert loop.steps == [1, 1]
with assert_cleanup():
xs = stream.just(1) + stream.never()
ys = xs | pipe.merge(xs) | pipe.timeout(1)
await assert_run(ys, [1, 1], asyncio.TimeoutError())
assert loop.steps == [1]
# Reproduce issue #65
with assert_cleanup():
xs = stream.iterate([1, 2])
ys = stream.iterate([3, 4])
zs = stream.merge(xs, ys) | pipe.take(3)
await assert_run(zs, [1, 2, 3])
with assert_cleanup():
xs = stream.iterate([1, 2, 3])
ys = stream.throw(ZeroDivisionError())
zs = stream.merge(xs, ys) | pipe.delay(1) | pipe.take(3)
await assert_run(zs, [1, 2, 3])
# Silencing of a CancelledError
async def agen1():
if False:
yield
try:
await asyncio.sleep(2)
except asyncio.CancelledError:
return
async def agen2():
yield 1
with assert_cleanup():
xs = stream.merge(agen1(), agen2()) | pipe.delay(1) | pipe.take(1)
await assert_run(xs, [1])
# Empty merge (issue #95)
xs = stream.merge()
await assert_run(xs, [])
@pytest.mark.asyncio
async def test_ziplatest(assert_run, assert_cleanup):
with assert_cleanup() as loop:
xs = stream.range(0, 5, 2, interval=2)
ys = stream.range(1, 5, 2, interval=2) | pipe.delay(1)
zs = stream.ziplatest(xs, ys, default="▲")
await assert_run(zs, [(0, "▲"), (0, 1), (2, 1), (2, 3), (4, 3)])
assert loop.steps == [1, 1, 1, 1]
with assert_cleanup() as loop:
xs = stream.range(0, 5, 2, interval=2)
ys = stream.range(1, 5, 2, interval=2) | pipe.delay(1)
zs = stream.ziplatest(xs, ys, partial=False)
await assert_run(zs, [(0, 1), (2, 1), (2, 3), (4, 3)])
assert loop.steps == [1, 1, 1, 1]
# Empty ziplatest (issue #95)
xs = stream.ziplatest()
await assert_run(xs, [])
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