Toss in another tests with daemon subactors

examples/debugging/multi_daemon_subactors.py

@@ -0,0 +1,31 @@
+import tractor
+import trio
+
+
+async def breakpoint_forever():
+    "Indefinitely re-enter debugger in child actor."
+    while True:
+        yield 'yo'
+        await tractor.breakpoint()
+
+
+async def name_error():
+    "Raise a ``NameError``"
+    getattr(doggypants)
+
+
+async def main():
+    """Test breakpoint in a streaming actor.
+    """
+    async with tractor.open_nursery() as n:
+
+        p0 = await n.start_actor('bp_forever', rpc_module_paths=[__name__])
+        p1 = await n.start_actor('name_error', rpc_module_paths=[__name__])
+
+        # retreive results
+        stream = await p0.run(__name__, 'breakpoint_forever')
+        await p1.run(__name__, 'name_error')
+
+
+if __name__ == '__main__':
+    tractor.run(main, debug_mode=True, loglevel='error')

tests/test_debugger.py

@@ -282,6 +282,34 @@ def test_multi_subactors(spawn):
     assert 'bdb.BdbQuit' in before
 
 
+def test_multi_daemon_subactors(spawn):
+    """Multiple daemon subactors, both erroring and breakpointing within a
+    stream.
+    """
+    child = spawn('multi_daemon_subactors')
+
+    child.expect(r"\(Pdb\+\+\)")
+
+    before = str(child.before.decode())
+    assert "Attaching pdb to actor: ('bp_forever'" in before
+
+    child.sendline('c')
+
+    # first name_error failure
+    child.expect(r"\(Pdb\+\+\)")
+    before = str(child.before.decode())
+    assert "NameError" in before
+
+    child.sendline('c')
+
+    child.expect(r"\(Pdb\+\+\)")
+    before = str(child.before.decode())
+    assert "tractor._exceptions.RemoteActorError: ('name_error'" in before
+
+    child.sendline('c')
+    child.expect(pexpect.EOF)
+
+
 def test_multi_subactors_root_errors(spawn):
     """Multiple subactors, both erroring and breakpointing as well as
     a nested subactor erroring.

tractor/__init__.py

@@ -20,8 +20,9 @@ from ._state import current_actor
 from . import _state
 from ._exceptions import RemoteActorError, ModuleNotExposed
 from ._debug import breakpoint, post_mortem
-from . import msg
 from . import _spawn
+from . import msg
+from . import to_asyncio
 
 
 __all__ = [
@@ -39,6 +40,7 @@ __all__ = [
     'RemoteActorError',
     'ModuleNotExposed',
     'msg'
+    'to_asyncio'
 ]
 
 
@@ -60,16 +62,23 @@ async def _main(
     """
     logger = log.get_logger('tractor')
 
+    # mark top most level process as root actor
+    _state._runtime_vars['_is_root'] = True
+
     if start_method is not None:
         _spawn.try_set_start_method(start_method)
 
     if debug_mode and _spawn._spawn_method == 'trio':
         _state._runtime_vars['_debug_mode'] = True
+
         # expose internal debug module to every actor allowing
         # for use of ``await tractor.breakpoint()``
         kwargs.setdefault('rpc_module_paths', []).append('tractor._debug')
+
     elif debug_mode:
-        raise RuntimeError("Debug mode is only supported for the `trio` backend!")
+        raise RuntimeError(
+            "Debug mode is only supported for the `trio` backend!"
+        )
 
     main = partial(async_fn, *args)
 
@@ -103,7 +112,10 @@ async def _main(
     else:
         # start this local actor as the arbiter
         actor = Arbiter(
-            name or 'arbiter', arbiter_addr=arbiter_addr, **kwargs)
+            name or 'arbiter',
+            arbiter_addr=arbiter_addr,
+            **kwargs
+        )
 
     # ``Actor._async_main()`` creates an internal nursery if one is not
     # provided and thus blocks here until it's main task completes.
@@ -134,9 +146,6 @@ def run(
 
     This is tractor's main entry and the start point for any async actor.
     """
-    # mark top most level process as root actor
-    _state._runtime_vars['_is_root'] = True
-
     return trio.run(
         partial(
             # our entry

tractor/_actor.py

@@ -304,7 +304,18 @@ class Actor:
         try:
             return getattr(self._mods[ns], funcname)
         except KeyError as err:
-            raise ModuleNotExposed(*err.args)
+            mne = ModuleNotExposed(*err.args)
+
+            if ns == '__main__':
+                msg = (
+                    "\n\nMake sure you exposed the current module using:\n\n"
+                    "ActorNursery.start_actor(<name>, rpc_module_paths="
+                    "[__name__])"
+                )
+
+                mne.msg += msg
+
+            raise mne
 
     async def _stream_handler(
         self,
@@ -594,7 +605,7 @@ class Actor:
                 # Receive runtime state from our parent
                 parent_data = await chan.recv()
                 log.debug(
-                    "Recieved state from parent:\n"
+                    "Received state from parent:\n"
                     f"{parent_data}"
                 )
                 accept_addr = (
@@ -602,6 +613,7 @@ class Actor:
                     parent_data.pop('bind_port'),
                 )
                 rvs = parent_data.pop('_runtime_vars')
+                log.debug(f"Runtime vars are: {rvs}")
                 rvs['_is_root'] = False
                 _state._runtime_vars.update(rvs)
 

tractor/_child.py

@@ -19,12 +19,15 @@ def parse_ipaddr(arg):
     return (str(host), int(port))
 
 
+from ._entry import _trio_main
+
 if __name__ == "__main__":
 
     parser = argparse.ArgumentParser()
     parser.add_argument("--uid", type=parse_uid)
     parser.add_argument("--loglevel", type=str)
     parser.add_argument("--parent_addr", type=parse_ipaddr)
+    parser.add_argument("--asyncio", action='store_true')
     args = parser.parse_args()
 
     subactor = Actor(
@@ -36,5 +39,6 @@ if __name__ == "__main__":
 
     _trio_main(
         subactor,
-        parent_addr=args.parent_addr
+        parent_addr=args.parent_addr,
+        infect_asyncio=args.asyncio,
     )

tractor/_discovery.py

@@ -42,6 +42,7 @@ async def get_root(
 **kwargs,
 ) -> typing.AsyncGenerator[Union[Portal, LocalPortal], None]:
     host, port = _runtime_vars['_root_mailbox']
+    assert host is not None
     async with _connect_chan(host, port) as chan:
         async with open_portal(chan, **kwargs) as portal:
             yield portal

tractor/_entry.py

@@ -22,6 +22,7 @@ def _mp_main(
     forkserver_info: Tuple[Any, Any, Any, Any, Any],
     start_method: str,
     parent_addr: Tuple[str, int] = None,
+    infect_asyncio: bool = False,
 ) -> None:
     """The routine called *after fork* which invokes a fresh ``trio.run``
     """
@@ -59,7 +60,9 @@ def _mp_main(
 
 def _trio_main(
     actor: 'Actor',
-    parent_addr: Tuple[str, int] = None
+    *,
+    parent_addr: Tuple[str, int] = None,
+    infect_asyncio: bool = False,
 ) -> None:
     """Entry point for a `trio_run_in_process` subactor.
     """
@@ -70,6 +73,8 @@ def _trio_main(
     # TODO: make a global func to set this or is it too hacky?
     # os.environ['PYTHONBREAKPOINT'] = 'tractor._debug.breakpoint'
 
+    log.info(f"Started new trio process for {actor.uid}")
+
     if actor.loglevel is not None:
         log.info(
             f"Setting loglevel for {actor.uid} to {actor.loglevel}")
@@ -87,6 +92,10 @@ def _trio_main(
     )
 
     try:
+        if infect_asyncio:
+            actor._infected_aio = True
+            run_as_asyncio_guest(trio_main)
+        else:
             trio.run(trio_main)
     except KeyboardInterrupt:
         log.warning(f"Actor {actor.uid} received KBI")

tractor/_spawn.py

@@ -157,6 +157,7 @@ async def cancel_on_completion(
 async def spawn_subactor(
     subactor: 'Actor',
     parent_addr: Tuple[str, int],
+    infect_asyncio: bool,
 ):
     spawn_cmd = [
         sys.executable,
@@ -181,6 +182,10 @@ async def spawn_subactor(
             subactor.loglevel
         ]
 
+    # Tell child to run in guest mode on top of ``asyncio`` loop
+    if infect_asyncio:
+        spawn_cmd.append("--asyncio")
+
     proc = await trio.open_process(spawn_cmd)
     try:
         yield proc
@@ -217,6 +222,7 @@ async def new_proc(
     _runtime_vars: Dict[str, Any],  # serialized and sent to _child
     *,
     use_trio_run_in_process: bool = False,
+    infect_asyncio: bool = False,
     task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED
 ) -> None:
     """Create a new ``multiprocessing.Process`` using the
@@ -232,6 +238,7 @@ async def new_proc(
             async with spawn_subactor(
                 subactor,
                 parent_addr,
+                infect_asyncio=infect_asyncio
             ) as proc:
                 log.info(f"Started {proc}")
 
@@ -321,6 +328,7 @@ async def new_proc(
                     fs_info,
                     start_method,
                     parent_addr,
+                    infect_asyncio,
                 ),
                 # daemon=True,
                 name=name,

tractor/_trionics.py

@@ -56,6 +56,7 @@ class ActorNursery:
         rpc_module_paths: List[str] = None,
         loglevel: str = None,  # set log level per subactor
         nursery: trio.Nursery = None,
+        infect_asyncio: bool = False,
     ) -> Portal:
         loglevel = loglevel or self._actor.loglevel or get_loglevel()
 
@@ -89,6 +90,7 @@ class ActorNursery:
                 bind_addr,
                 parent_addr,
                 _rtv,  # run time vars
+                infect_asyncio=infect_asyncio,
             )
         )
 
@@ -101,6 +103,7 @@ class ActorNursery:
         rpc_module_paths: Optional[List[str]] = None,
         statespace: Dict[str, Any] = None,
         loglevel: str = None,  # set log level per subactor
+        infect_asyncio: bool = False,
         **kwargs,  # explicit args to ``fn``
     ) -> Portal:
         """Spawn a new actor, run a lone task, then terminate the actor and
@@ -119,6 +122,7 @@ class ActorNursery:
             loglevel=loglevel,
             # use the run_in_actor nursery
             nursery=self._ria_nursery,
+            infect_asyncio=infect_asyncio,
         )
         # this marks the actor to be cancelled after its portal result
         # is retreived, see logic in `open_nursery()` below.

tractor/to_asyncio.py

@@ -4,8 +4,9 @@ Infection apis for ``asyncio`` loops running ``trio`` using guest mode.
 import asyncio
 import inspect
 from typing import (
+    Any,
     Callable,
-    AsyncGenerator,
+    AsyncIterator,
     Awaitable,
     Union,
 )
@@ -21,21 +22,26 @@ log = get_logger(__name__)
 __all__ = ['run_task', 'run_as_asyncio_guest']
 
 
-async def _invoke(
+async def run_coro(
-    from_trio: trio.abc.ReceiveChannel,
+    to_trio: trio.MemorySendChannel,
-    to_trio: asyncio.Queue,
     coro: Awaitable,
 ) -> None:
-    """Await or stream awaiable object based on ``coro`` type into
+    """Await ``coro`` and relay result back to ``trio``.
-    ``trio`` memory channel.
+    """
-
+    to_trio.send_nowait(await coro)
-    ``from_trio`` might eventually be used here for bidirectional streaming.
+
+
+async def consume_asyncgen(
+    to_trio: trio.MemorySendChannel,
+    coro: AsyncIterator,
+) -> None:
+    """Stream async generator results back to ``trio``.
+
+    ``from_trio`` might eventually be used here for
+    bidirectional streaming.
     """
-    if inspect.isasyncgen(coro):
     async for item in coro:
         to_trio.send_nowait(item)
-    elif inspect.iscoroutine(coro):
-        to_trio.send_nowait(await coro)
 
 
 async def run_task(
@@ -44,15 +50,15 @@ async def run_task(
     qsize: int = 2**10,
     _treat_as_stream: bool = False,
     **kwargs,
-) -> Union[AsyncGenerator, Awaitable]:
+) -> Any:
     """Run an ``asyncio`` async function or generator in a task, return
     or stream the result back to ``trio``.
     """
     assert current_actor().is_infected_aio()
 
     # ITC (inter task comms)
-    from_trio = asyncio.Queue(qsize)
+    from_trio = asyncio.Queue(qsize)  # type: ignore
-    to_trio, from_aio = trio.open_memory_channel(qsize)
+    to_trio, from_aio = trio.open_memory_channel(qsize)  # type: ignore
 
     args = tuple(inspect.getfullargspec(func).args)
 
@@ -66,49 +72,69 @@ async def run_task(
     if 'to_trio' in args:
         kwargs['to_trio'] = to_trio
     if 'from_trio' in args:
-        kwargs['from_trio'] = to_trio
+        kwargs['from_trio'] = from_trio
 
     coro = func(**kwargs)
 
     cancel_scope = trio.CancelScope()
 
     # start the asyncio task we submitted from trio
-    # TODO: try out ``anyio`` asyncio based tg here
+    if inspect.isawaitable(coro):
-    task = asyncio.create_task(_invoke(from_trio, to_trio, coro))
+        task = asyncio.create_task(run_coro(to_trio, coro))
-    err = None
+    elif inspect.isasyncgen(coro):
+        task = asyncio.create_task(consume_asyncgen(to_trio, coro))
+    else:
+        raise TypeError(f"No support for invoking {coro}")
+
+    aio_err = None
 
     def cancel_trio(task):
         """Cancel the calling ``trio`` task on error.
         """
         nonlocal err
-        err = task.exception()
+        aio_err = task.exception()
+        if aio_err:
+            log.exception(f"asyncio task errorred:\n{aio_err}")
         cancel_scope.cancel()
 
     task.add_done_callback(cancel_trio)
 
-    # asycn gen
+    # async iterator
     if inspect.isasyncgen(coro) or _treat_as_stream:
-        async def result():
+
+        async def stream_results():
+            try:
                 with cancel_scope:
+                    # stream values upward
                     async with from_aio:
                         async for item in from_aio:
                             yield item
-            if cancel_scope.cancelled_caught and err:
+            except BaseException as err:
-                raise err
+                if aio_err is not None:
+                    # always raise from any captured asyncio error
+                    raise err from aio_err
+                else:
+                    raise
 
-        return result()
+        return stream_results()
 
     # simple async func
-    elif inspect.iscoroutine(coro):
+    try:
         with cancel_scope:
-            result = await from_aio.receive()
+            # return single value
-            return result
+            return await from_aio.receive()
-        if cancel_scope.cancelled_caught and err:
+
-            raise err
+    # Do we need this?
+    except BaseException as err:
+        if aio_err is not None:
+            # always raise from any captured asyncio error
+            raise err from aio_err
+        else:
+            raise
 
 
 def run_as_asyncio_guest(
-    trio_main: Awaitable,
+    trio_main: Callable,
 ) -> None:
     """Entry for an "infected ``asyncio`` actor".