Add context test that opens an inter-task-channel that errors

examples/infected_asyncio_echo_server.py

@@ -13,6 +13,7 @@ import tractor
 async def aio_echo_server(
     to_trio: trio.MemorySendChannel,
     from_trio: asyncio.Queue,
+
 ) -> None:
 
     # a first message must be sent **from** this ``asyncio``

tests/test_infected_asyncio.py

@@ -11,12 +11,26 @@ import importlib
 import pytest
 import trio
 import tractor
-from tractor import to_asyncio
+from tractor import (
-from tractor import RemoteActorError
+    to_asyncio,
+    RemoteActorError,
+    ContextCancelled
+)
 from tractor.trionics import BroadcastReceiver
 
 
-async def sleep_and_err(sleep_for: float = 0.1):
+async def sleep_and_err(
+    sleep_for: float = 0.1,
+
+    # just signature placeholders for compat with
+    # ``to_asyncio.open_channel_from()``
+    to_trio: Optional[trio.MemorySendChannel] = None,
+    from_trio: Optional[asyncio.Queue] = None,
+
+):
+    if to_trio:
+        to_trio.send_nowait('start')
+
     await asyncio.sleep(sleep_for)
     assert 0
 
@@ -146,6 +160,81 @@ def test_trio_cancels_aio(arb_addr):
     trio.run(main)
 
 
+@tractor.context
+async def trio_ctx(
+    ctx: tractor.Context,
+):
+
+    await ctx.started('start')
+
+    # this will block until the ``asyncio`` task sends a "first"
+    # message.
+    with trio.fail_after(0.5):
+        async with (
+            tractor.to_asyncio.open_channel_from(
+                sleep_and_err,
+            ) as (first, chan),
+
+            trio.open_nursery() as n,
+        ):
+
+            assert first == 'start'
+
+            # spawn another asyncio task for the cuck of it.
+            n.start_soon(
+                tractor.to_asyncio.run_task,
+                sleep_forever,
+            )
+            # await trio.sleep_forever()
+
+
+@pytest.mark.parametrize(
+    'parent_cancels', [False, True],
+    ids='parent_actor_cancels_child={}'.format
+)
+def test_context_spawns_aio_task_that_errors(
+    arb_addr,
+    parent_cancels: bool,
+):
+    '''
+    Verify that spawning a task via an intertask channel ctx mngr that
+    errors correctly propagates the error back from the `asyncio`-side
+    taksk.
+
+    '''
+    async def main():
+
+        async with tractor.open_nursery() as n:
+            p = await n.start_actor(
+                'aio_daemon',
+                enable_modules=[__name__],
+                infect_asyncio=True,
+                # debug_mode=True,
+                loglevel='cancel',
+            )
+            async with p.open_context(
+                trio_ctx,
+            ) as (ctx, first):
+
+                assert first == 'start'
+
+                if parent_cancels:
+                    await p.cancel_actor()
+
+                await trio.sleep_forever()
+
+
+    with pytest.raises(RemoteActorError) as excinfo:
+        trio.run(main)
+
+    err = excinfo.value
+    assert isinstance(err, RemoteActorError)
+    if parent_cancels:
+        assert err.type == trio.Cancelled
+    else:
+        assert err.type == AssertionError
+
+
 async def aio_cancel():
     ''''
     Cancel urself boi.
@@ -385,6 +474,8 @@ async def trio_to_aio_echo_server(
                 print('breaking aio echo loop')
                 break
 
+        print('exiting asyncio task')
+
     async with to_asyncio.open_channel_from(
         aio_echo_server,
     ) as (first, chan):