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Add test for : "msg sent before stream opened"

This always triggered the mentioned race condition.
We need to figure out the best approach to avoid this case.
stricter_context_starting
Tyler Goodlet 2021-11-28 18:51:34 -05:00
parent f4793af2b9
commit 568902a5a9
1 changed files with 54 additions and 0 deletions

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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 trio
from trio.lowlevel import current_task
import tractor
@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')
trio.run(main)