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import pytest
from aiostream import stream, pipe
from aiostream.core import Stream
@pytest.mark.asyncio
async def test_concatmap(assert_run, assert_cleanup):
def target1(x: int, *_) -> Stream[int]:
return stream.range(x, x + 2, interval=5)
def target2(x: int, *_) -> Stream[int]:
return stream.range(x, x + 4, interval=1)
def target3(x: int, *_) -> Stream[int]:
return stream.range(0, 3, interval=1) if x else stream.throw(ZeroDivisionError)
# Concurrent run
with assert_cleanup() as loop:
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.concatmap(target1)
await assert_run(ys, [0, 1, 2, 3, 4, 5])
assert loop.steps == [1, 1, 3, 5, 5]
# Sequential run
with assert_cleanup() as loop:
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.concatmap(target1, task_limit=1)
await assert_run(ys, [0, 1, 2, 3, 4, 5])
assert loop.steps == [5, 1, 5, 1, 5]
# Limited run
with assert_cleanup() as loop:
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.concatmap(target1, task_limit=2)
await assert_run(ys, [0, 1, 2, 3, 4, 5])
assert loop.steps == [1, 4, 1, 4, 5]
# Make sure item arrive as soon as possible
with assert_cleanup() as loop:
xs = stream.just(2)
ys = xs | pipe.concatmap(target2)
zs = ys | pipe.timeout(2) # Sould NOT raise
await assert_run(zs, [2, 3, 4, 5])
assert loop.steps == [1, 1, 1]
# An exception might get discarded if the result can be produced before the
# processing of the exception is required
with assert_cleanup() as loop:
xs = stream.iterate([True, False])
ys = xs | pipe.concatmap(target3)
zs = ys | pipe.take(3)
await assert_run(zs, [0, 1, 2])
assert loop.steps == [1, 1]
@pytest.mark.asyncio
async def test_flatmap(assert_run, assert_cleanup):
def target1(x: int, *_) -> Stream[int]:
return stream.range(x, x + 2, interval=5)
# Concurrent run
with assert_cleanup() as loop:
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.flatmap(target1)
await assert_run(ys, [0, 2, 4, 1, 3, 5])
assert loop.steps == [1, 1, 3, 1, 1]
# Sequential run
with assert_cleanup() as loop:
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.flatmap(target1, task_limit=1)
await assert_run(ys, [0, 1, 2, 3, 4, 5])
assert loop.steps == [5, 1, 5, 1, 5]
# Limited run
with assert_cleanup() as loop:
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.flatmap(target1, task_limit=2)
await assert_run(ys, [0, 2, 1, 3, 4, 5])
assert loop.steps == [1, 4, 1, 5]
@pytest.mark.asyncio
async def test_switchmap(assert_run, assert_cleanup):
def target1(x: int, *_) -> Stream[int]:
return stream.range(x, x + 5, interval=1)
def target2(x: int, *_) -> Stream[int]:
return stream.range(x, x + 2, interval=2)
with assert_cleanup() as loop:
xs = stream.range(0, 30, 10, interval=3)
ys = xs | pipe.switchmap(target1)
await assert_run(ys, [0, 1, 2, 10, 11, 12, 20, 21, 22, 23, 24])
assert loop.steps == [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
# Test cleanup procedure
with assert_cleanup() as loop:
xs = stream.range(0, 5, interval=1)
ys = xs | pipe.switchmap(target2)
await assert_run(ys[:3], [0, 1, 2])
assert loop.steps == [1, 1]
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