Support asyncio actors with the trio spawner backend

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/_entry.py

@@ -20,6 +20,7 @@ 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``
     """
@@ -61,12 +62,15 @@ def _trio_main(
     actor: 'Actor',  # type: ignore # noqa
     *,
     parent_addr: Tuple[str, int] = None,
+    infect_asyncio: bool = False,
 ) -> None:
     """Entry point for a `trio_run_in_process` subactor.
 
     """
     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}")
@@ -84,7 +88,11 @@ 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

@@ -159,6 +159,7 @@ async def cancel_on_completion(
 async def spawn_subactor(
     subactor: 'Actor',
     parent_addr: Tuple[str, int],
+    infect_asyncio: bool,
 ):
     spawn_cmd = [
         sys.executable,
@@ -183,6 +184,10 @@ 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
@@ -240,6 +245,7 @@ async def new_proc(
     parent_addr: Tuple[str, int],
     _runtime_vars: Dict[str, Any],  # serialized and sent to _child
     *,
+    infect_asyncio: bool = False,
     task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED
 ) -> None:
     """Create a new ``multiprocessing.Process`` using the
@@ -255,6 +261,7 @@ async def new_proc(
             async with spawn_subactor(
                 subactor,
                 parent_addr,
+                infect_asyncio=infect_asyncio
             ) as proc:
                 log.info(f"Started {proc}")
 
@@ -392,6 +399,7 @@ async def mp_new_proc(
                 fs_info,
                 start_method,
                 parent_addr,
+                infect_asyncio,
             ),
             # daemon=True,
             name=name,