Denoise some common teardown "errors" to warnings.

tractor/_actor.py

@@ -144,7 +144,7 @@ async def _invoke(
         try:
             await chan.send(err_msg)
         except trio.ClosedResourceError:
-            log.exception(
+            log.warning(
                 f"Failed to ship error to caller @ {chan.uid}")
         if cs is None:
             # error is from above code not from rpc invocation

tractor/_debug.py

@@ -15,6 +15,7 @@ from .log import get_logger
 from . import _state
 from ._discovery import get_root
 from ._state import is_root_process
+from ._exceptions import is_multi_cancelled
 
 try:
     # wtf: only exported when installed in dev mode?
@@ -318,10 +319,7 @@ async def _maybe_enter_pm(err):
 
         # Really we just want to mostly avoid catching KBIs here so there
         # might be a simpler check we can do?
-        and trio.MultiError.filter(
-            lambda exc: exc if not isinstance(exc, trio.Cancelled) else None,
-            err,
-        )
+        and not is_multi_cancelled(err)
     ):
         log.warning("Actor crashed, entering debug mode")
         await post_mortem()

tractor/_ipc.py

@@ -51,7 +51,7 @@ class MsgpackStream:
                 data = await self.stream.receive_some(2**10)
                 log.trace(f"received {data}")  # type: ignore
             except trio.BrokenResourceError:
-                log.error(f"Stream connection {self.raddr} broke")
+                log.warning(f"Stream connection {self.raddr} broke")
                 return
 
             if data == b'':

tractor/_trionics.py

@@ -13,6 +13,7 @@ from ._state import current_actor
 from .log import get_logger, get_loglevel
 from ._actor import Actor
 from ._portal import Portal
+from ._exceptions import is_multi_cancelled
 from . import _state
 from . import _spawn
 
@@ -246,7 +247,9 @@ async def open_nursery() -> typing.AsyncGenerator[ActorNursery, None]:
                         # For now, shield both.
                         with trio.CancelScope(shield=True):
                             etype = type(err)
-                            if etype in (trio.Cancelled, KeyboardInterrupt):
+                            if etype in (trio.Cancelled, KeyboardInterrupt) or (
+                                is_multi_cancelled(err)
+                            ):
                                 log.warning(
                                     f"Nursery for {current_actor().uid} was "
                                     f"cancelled with {etype}")