Make actor runtime cancellation immediate
Tyler Goodlet
parent
f72eabd42a
commit
2afbc3898f
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@ -506,8 +506,8 @@ class Actor:
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log.runtime(f"Peers is {self._peers}")
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if not self._peers: # no more channels connected
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self._no_more_peers.set()
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log.runtime("Signalling no more peer channels")
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self._no_more_peers.set()
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# # XXX: is this necessary (GC should do it?)
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if chan.connected():
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@ -674,7 +674,28 @@ class Actor:
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f"{ns}.{funcname}({kwargs})")
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if ns == 'self':
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func = getattr(self, funcname)
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if funcname == '_cancel_task':
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if funcname == 'cancel':
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# don't start entire actor runtime cancellation if this
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# actor is in debug mode
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pdb_complete = _debug._local_pdb_complete
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if pdb_complete:
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await pdb_complete.wait()
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# we immediately start the runtime machinery shutdown
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await _invoke(self, cid, chan, func, kwargs)
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# self.cancel() was called so kill this msg loop
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# and break out into ``_async_main()``
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log.cancel(
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f"Actor {self.uid} was remotely cancelled; "
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"waiting on cancellation completion..")
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await self._cancel_complete.wait()
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loop_cs.cancel()
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break
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elif funcname == '_cancel_task':
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# XXX: a special case is made here for
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# remote calls since we don't want the
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# remote actor have to know which channel
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@ -684,6 +705,7 @@ class Actor:
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# Portal.run('self', '_cancel_task, cid=did)
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# without passing the `chan` arg.
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kwargs['chan'] = chan
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else:
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# complain to client about restricted modules
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try:
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@ -709,37 +731,28 @@ class Actor:
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# never allow cancelling cancel requests (results in
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# deadlock and other weird behaviour)
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if func != self.cancel:
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if isinstance(cs, Exception):
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log.warning(
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f"Task for RPC func {func} failed with"
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f"{cs}")
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else:
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# mark that we have ongoing rpc tasks
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self._ongoing_rpc_tasks = trio.Event()
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log.runtime(f"RPC func is {func}")
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# store cancel scope such that the rpc task can be
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# cancelled gracefully if requested
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self._rpc_tasks[(chan, cid)] = (
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cs, func, trio.Event())
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else:
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# self.cancel() was called so kill this msg loop
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# and break out into ``_async_main()``
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# if func != self.cancel:
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if isinstance(cs, Exception):
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log.warning(
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f"Actor {self.uid} was remotely cancelled; "
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"waiting on cancellation completion..")
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await self._cancel_complete.wait()
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loop_cs.cancel()
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break
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f"Task for RPC func {func} failed with"
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f"{cs}")
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else:
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# mark that we have ongoing rpc tasks
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self._ongoing_rpc_tasks = trio.Event()
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log.runtime(f"RPC func is {func}")
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# store cancel scope such that the rpc task can be
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# cancelled gracefully if requested
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self._rpc_tasks[(chan, cid)] = (
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cs, func, trio.Event())
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log.runtime(
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f"Waiting on next msg for {chan} from {chan.uid}")
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else:
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# channel disconnect
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log.runtime(
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f"{chan} for {chan.uid} disconnected, cancelling tasks"
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)
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await self.cancel_rpc_tasks(chan)
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# end of async for, channel disconnect vis ``trio.EndOfChannel``
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log.runtime(
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f"{chan} for {chan.uid} disconnected, cancelling tasks"
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)
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await self.cancel_rpc_tasks(chan)
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except (
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TransportClosed,
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@ -950,6 +963,9 @@ class Actor:
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# Blocks here as expected until the root nursery is
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# killed (i.e. this actor is cancelled or signalled by the parent)
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except Exception as err:
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log.info("Closing all actor lifetime contexts")
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_lifetime_stack.close()
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if not registered_with_arbiter:
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# TODO: I guess we could try to connect back
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# to the parent through a channel and engage a debugger
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@ -979,11 +995,21 @@ class Actor:
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raise
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finally:
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log.runtime("Root nursery complete")
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log.info("Root nursery complete")
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# tear down all lifetime contexts if not in guest mode
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# XXX: should this just be in the entrypoint?
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log.cancel("Closing all actor lifetime contexts")
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log.info("Closing all actor lifetime contexts")
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# TODO: we can't actually do this bc the debugger
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# uses the _service_n to spawn the lock task, BUT,
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# in theory if we had the root nursery surround this finally
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# block it might be actually possible to debug THIS
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# machinery in the same way as user task code?
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# if self.name == 'brokerd.ib':
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# with trio.CancelScope(shield=True):
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# await _debug.breakpoint()
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_lifetime_stack.close()
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# Unregister actor from the arbiter
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@ -1102,7 +1128,7 @@ class Actor:
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if self._service_n:
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self._service_n.cancel_scope.cancel()
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log.cancel(f"{self.uid} was sucessfullly cancelled")
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log.cancel(f"{self.uid} called `Actor.cancel()`")
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self._cancel_complete.set()
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return True
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