Better tractor startup, runtime detection

piker/_daemon.py

@@ -68,19 +68,16 @@ async def open_pikerd(
     assert _services is None
 
     # XXX: this may open a root actor as well
-    async with tractor.open_nursery(
-
+    async with tractor.open_root_actor(
             # passed through to ``open_root_actor``
             name=_root_dname,
             loglevel=loglevel,
-
             # TODO: eventually we should be able to avoid
             # having the root have more then permissions to
             # spawn other specialized daemons I think?
             # enable_modules=[__name__],
             enable_modules=_root_modules,
-
-    ) as actor_nursery:
+    ) as _, tractor.open_nursery() as actor_nursery:
         async with trio.open_nursery() as service_nursery:
 
             # assign globally for future daemon/task creation
@@ -107,14 +104,13 @@ async def maybe_open_pikerd(
 
     try:
         async with tractor.find_actor(_root_dname) as portal:
-            if portal is not None:  # pikerd exists
+            assert portal is not None
             yield portal
             return
 
-    except RuntimeError:  # tractor runtime not started yet
-        pass
+    except (RuntimeError, AssertionError):  # tractor runtime not started yet
 
-    # assume pikerd role
+        # presume pikerd role
         async with open_pikerd(
             loglevel,
             **kwargs,