Support asyncio actors with the trio spawner backend

tractor/_child.py

@@ -37,12 +37,15 @@ 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(
@@ -54,5 +57,6 @@ if __name__ == "__main__":
 
     _trio_main(
         subactor,
-        parent_addr=args.parent_addr
-    )
+        parent_addr=args.parent_addr,
+        infect_asyncio=args.asyncio,
+    )

tractor/_entry.py

@@ -38,6 +38,7 @@ 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``
     """
@@ -79,6 +80,7 @@ def _trio_main(
     actor: 'Actor',  # type: ignore
     *,
     parent_addr: Tuple[str, int] = None,
+    infect_asyncio: bool = False,
 ) -> None:
     """Entry point for a `trio_run_in_process` subactor.
     """
@@ -88,6 +90,8 @@ def _trio_main(
 
     log.info(f"Started new trio process for {actor.uid}")
 
+    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}")
@@ -105,7 +109,11 @@ def _trio_main(
     )
 
     try:
-        trio.run(trio_main)
+        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

@@ -244,6 +244,7 @@ async def new_proc(
     _runtime_vars: Dict[str, Any],  # serialized and sent to _child
 
     *,
+    infect_asyncio: bool = False,
     task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED
 
 ) -> None:
@@ -260,7 +261,6 @@ async def new_proc(
     uid = subactor.uid
 
     if _spawn_method == 'trio':
-
         spawn_cmd = [
             sys.executable,
             "-m",
@@ -283,6 +283,9 @@ async def new_proc(
                 "--loglevel",
                 subactor.loglevel
             ]
+        # Tell child to run in guest mode on top of ``asyncio`` loop
+        if infect_asyncio:
+            spawn_cmd.append("--asyncio")
 
         cancelled_during_spawn: bool = False
         proc: Optional[trio.Process] = None