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tractor/tests/test_context_streams.py

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'''
``async with ():`` inlined context-stream cancellation testing.
Verify the we raise errors when streams are opened prior to sync-opening
a ``tractor.Context`` beforehand.
'''
import pytest
import trio
from trio.lowlevel import current_task
import tractor
@tractor.context
async def really_started(
ctx: tractor.Context,
) -> None:
await ctx.started()
try:
await ctx.started()
except RuntimeError as err:
raise
def test_started_called_more_then_once():
async def main():
async with tractor.open_nursery() as n:
portal = await n.start_actor(
'too_much_starteds',
enable_modules=[__name__],
)
async with portal.open_context(really_started) as (ctx, sent):
pass
with pytest.raises(tractor.RemoteActorError) as excinfo:
trio.run(main)
@tractor.context
async def never_open_stream(
ctx: tractor.Context,
) -> None:
'''Bidir streaming endpoint which will stream
back any sequence it is sent item-wise.
'''
await ctx.started()
await trio.sleep_forever()
def test_no_far_end_stream_opened():
'''
This should exemplify the bug from:
https://github.com/goodboy/tractor/issues/265
'''
async def main():
async with tractor.open_nursery() as n:
portal = await n.start_actor(
'starts_no_stream',
enable_modules=[__name__],
)
async with (
portal.open_context(
never_open_stream,) as (ctx, sent),
ctx.open_stream() as stream,
):
assert sent is None
# XXX: so the question is whether
# this should error if the far end
# has not yet called `ctx.open_stream()`?
# If we decide to do that we need a synchronization
# message which is sent from that call?
await stream.send('yo')
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# without this we block waiting on the child side
await ctx.cancel()
await portal.cancel_actor()
trio.run(main)