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tractor/tests/test_infected_asyncio.py

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Python

'''
The hipster way to force SC onto the stdlib's "async": 'infection mode'.
'''
from typing import Optional, Iterable, Union
import asyncio
import builtins
import itertools
import importlib
import pytest
import trio
import tractor
from tractor import to_asyncio
from tractor import RemoteActorError
from tractor.trionics import BroadcastReceiver
async def sleep_and_err(sleep_for: float = 0.1):
await asyncio.sleep(sleep_for)
assert 0
async def sleep_forever():
await asyncio.sleep(float('inf'))
async def trio_cancels_single_aio_task():
# spawn an ``asyncio`` task to run a func and return result
with trio.move_on_after(.2):
await tractor.to_asyncio.run_task(sleep_forever)
def test_trio_cancels_aio_on_actor_side(arb_addr):
'''
Spawn an infected actor that is cancelled by the ``trio`` side
task using std cancel scope apis.
'''
async def main():
async with tractor.open_nursery(
arbiter_addr=arb_addr
) as n:
await n.run_in_actor(
trio_cancels_single_aio_task,
infect_asyncio=True,
)
trio.run(main)
async def asyncio_actor(
target: str,
expect_err: Optional[Exception] = None
) -> None:
assert tractor.current_actor().is_infected_aio()
target = globals()[target]
if '.' in expect_err:
modpath, _, name = expect_err.rpartition('.')
mod = importlib.import_module(modpath)
error_type = getattr(mod, name)
else: # toplevel builtin error type
error_type = builtins.__dict__.get(expect_err)
try:
# spawn an ``asyncio`` task to run a func and return result
await tractor.to_asyncio.run_task(target)
except BaseException as err:
if expect_err:
assert isinstance(err, error_type)
raise
def test_aio_simple_error(arb_addr):
'''
Verify a simple remote asyncio error propagates back through trio
to the parent actor.
'''
async def main():
async with tractor.open_nursery(
arbiter_addr=arb_addr
) as n:
await n.run_in_actor(
asyncio_actor,
target='sleep_and_err',
expect_err='AssertionError',
infect_asyncio=True,
)
with pytest.raises(RemoteActorError) as excinfo:
trio.run(main)
err = excinfo.value
assert isinstance(err, RemoteActorError)
assert err.type == AssertionError
def test_tractor_cancels_aio(arb_addr):
'''
Verify we can cancel a spawned asyncio task gracefully.
'''
async def main():
async with tractor.open_nursery() as n:
portal = await n.run_in_actor(
asyncio_actor,
target='sleep_forever',
expect_err='trio.Cancelled',
infect_asyncio=True,
)
# cancel the entire remote runtime
await portal.cancel_actor()
trio.run(main)
def test_trio_cancels_aio(arb_addr):
'''
Much like the above test with ``tractor.Portal.cancel_actor()``
except we just use a standard ``trio`` cancellation api.
'''
async def main():
with trio.move_on_after(1):
# cancel the nursery shortly after boot
async with tractor.open_nursery() as n:
await n.run_in_actor(
asyncio_actor,
target='sleep_forever',
expect_err='trio.Cancelled',
infect_asyncio=True,
)
trio.run(main)
async def aio_cancel():
''''
Cancel urself boi.
'''
await asyncio.sleep(0.5)
task = asyncio.current_task()
# cancel and enter sleep
task.cancel()
await sleep_forever()
def test_aio_cancelled_from_aio_causes_trio_cancelled(arb_addr):
async def main():
async with tractor.open_nursery() as n:
await n.run_in_actor(
asyncio_actor,
target='aio_cancel',
expect_err='tractor.to_asyncio.AsyncioCancelled',
infect_asyncio=True,
)
with pytest.raises(RemoteActorError) as excinfo:
trio.run(main)
# ensure boxed error is correct
assert excinfo.value.type == to_asyncio.AsyncioCancelled
# TODO: verify open_channel_from will fail on this..
async def no_to_trio_in_args():
pass
async def push_from_aio_task(
sequence: Iterable,
to_trio: trio.abc.SendChannel,
expect_cancel: False,
fail_early: bool,
) -> None:
try:
# sync caller ctx manager
to_trio.send_nowait(True)
for i in sequence:
print(f'asyncio sending {i}')
to_trio.send_nowait(i)
await asyncio.sleep(0.001)
if i == 50 and fail_early:
raise Exception
print('asyncio streamer complete!')
except asyncio.CancelledError:
if not expect_cancel:
pytest.fail("aio task was cancelled unexpectedly")
raise
else:
if expect_cancel:
pytest.fail("aio task wasn't cancelled as expected!?")
async def stream_from_aio(
exit_early: bool = False,
raise_err: bool = False,
aio_raise_err: bool = False,
fan_out: bool = False,
) -> None:
seq = range(100)
expect = list(seq)
try:
pulled = []
async with to_asyncio.open_channel_from(
push_from_aio_task,
sequence=seq,
expect_cancel=raise_err or exit_early,
fail_early=aio_raise_err,
) as (first, chan):
assert first is True
async def consume(
chan: Union[
to_asyncio.LinkedTaskChannel,
BroadcastReceiver,
],
):
async for value in chan:
print(f'trio received {value}')
pulled.append(value)
if value == 50:
if raise_err:
raise Exception
elif exit_early:
break
if fan_out:
# start second task that get's the same stream value set.
async with (
# NOTE: this has to come first to avoid
# the channel being closed before the nursery
# tasks are joined..
chan.subscribe() as br,
trio.open_nursery() as n,
):
n.start_soon(consume, br)
await consume(chan)
else:
await consume(chan)
finally:
if (
not raise_err and
not exit_early and
not aio_raise_err
):
if fan_out:
# we get double the pulled values in the
# ``.subscribe()`` fan out case.
doubled = list(itertools.chain(*zip(expect, expect)))
expect = doubled[:len(pulled)]
if pulled != expect:
print(
f'uhhh pulled is {pulled}\n',
f'uhhh expect is {expect}\n',
)
assert pulled == expect
else:
assert pulled == expect
else:
assert not fan_out
assert pulled == expect[:51]
print('trio guest mode task completed!')
@pytest.mark.parametrize(
'fan_out', [False, True],
ids='fan_out_w_chan_subscribe={}'.format
)
def test_basic_interloop_channel_stream(arb_addr, fan_out):
async def main():
async with tractor.open_nursery() as n:
portal = await n.run_in_actor(
stream_from_aio,
infect_asyncio=True,
fan_out=fan_out,
)
await portal.result()
trio.run(main)
# TODO: parametrize the above test and avoid the duplication here?
def test_trio_error_cancels_intertask_chan(arb_addr):
async def main():
async with tractor.open_nursery() as n:
portal = await n.run_in_actor(
stream_from_aio,
raise_err=True,
infect_asyncio=True,
)
# should trigger remote actor error
await portal.result()
with pytest.raises(RemoteActorError) as excinfo:
trio.run(main)
# ensure boxed error is correct
assert excinfo.value.type == Exception
def test_trio_closes_early_and_channel_exits(arb_addr):
async def main():
async with tractor.open_nursery() as n:
portal = await n.run_in_actor(
stream_from_aio,
exit_early=True,
infect_asyncio=True,
)
# should trigger remote actor error
await portal.result()
# should be a quiet exit on a simple channel exit
trio.run(main)
def test_aio_errors_and_channel_propagates_and_closes(arb_addr):
async def main():
async with tractor.open_nursery() as n:
portal = await n.run_in_actor(
stream_from_aio,
aio_raise_err=True,
infect_asyncio=True,
)
# should trigger remote actor error
await portal.result()
with pytest.raises(RemoteActorError) as excinfo:
trio.run(main)
# ensure boxed error is correct
assert excinfo.value.type == Exception
@tractor.context
async def trio_to_aio_echo_server(
ctx: tractor.Context,
):
async def aio_echo_server(
to_trio: trio.MemorySendChannel,
from_trio: asyncio.Queue,
) -> None:
to_trio.send_nowait('start')
while True:
msg = await from_trio.get()
# echo the msg back
to_trio.send_nowait(msg)
# if we get the terminate sentinel
# break the echo loop
if msg is None:
print('breaking aio echo loop')
break
async with to_asyncio.open_channel_from(
aio_echo_server,
) as (first, chan):
assert first == 'start'
await ctx.started(first)
async with ctx.open_stream() as stream:
async for msg in stream:
print(f'asyncio echoing {msg}')
await chan.send(msg)
out = await chan.receive()
# echo back to parent actor-task
await stream.send(out)
if out is None:
try:
out = await chan.receive()
except trio.EndOfChannel:
break
else:
raise RuntimeError('aio channel never stopped?')
@pytest.mark.parametrize(
'raise_error_mid_stream',
[False, Exception, KeyboardInterrupt],
ids='raise_error={}'.format,
)
def test_echoserver_detailed_mechanics(
arb_addr,
raise_error_mid_stream,
):
async def main():
async with tractor.open_nursery() as n:
p = await n.start_actor(
'aio_server',
enable_modules=[__name__],
infect_asyncio=True,
)
async with p.open_context(
trio_to_aio_echo_server,
) as (ctx, first):
assert first == 'start'
async with ctx.open_stream() as stream:
for i in range(100):
await stream.send(i)
out = await stream.receive()
assert i == out
if raise_error_mid_stream and i == 50:
raise raise_error_mid_stream
# send terminate msg
await stream.send(None)
out = await stream.receive()
assert out is None
if out is None:
# ensure the stream is stopped
# with trio.fail_after(0.1):
try:
await stream.receive()
except trio.EndOfChannel:
pass
else:
pytest.fail(
"stream wasn't stopped after sentinel?!")
# TODO: the case where this blocks and
# is cancelled by kbi or out of task cancellation
await p.cancel_actor()
if raise_error_mid_stream:
with pytest.raises(raise_error_mid_stream):
trio.run(main)
else:
trio.run(main)