Always shield cancel the caller on cancel-causing-errors, add teardown logging
Tyler Goodlet
parent
c2484e88a1
commit
91640facbc
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@ -295,6 +295,7 @@ class Portal:
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self,
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async_gen_func: Callable, # typing: ignore
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**kwargs,
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) -> AsyncGenerator[ReceiveMsgStream, None]:
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if not inspect.isasyncgenfunction(async_gen_func):
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@ -347,7 +348,6 @@ class Portal:
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self,
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func: Callable,
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cancel_on_exit: bool = False,
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**kwargs,
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) -> AsyncGenerator[Tuple[Context, Any], None]:
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@ -359,6 +359,7 @@ class Portal:
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and synchronized final result collection. See ``tractor.Context``.
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'''
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# conduct target func method structural checks
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if not inspect.iscoroutinefunction(func) and (
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getattr(func, '_tractor_contex_function', False)
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@ -390,6 +391,7 @@ class Portal:
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else:
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raise
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_err = None
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# deliver context instance and .started() msg value in open
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# tuple.
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try:
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@ -403,26 +405,20 @@ class Portal:
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)
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recv_chan._ctx = ctx
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# await trio.lowlevel.checkpoint()
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yield ctx, first
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log.info(f'Context for {func.__name__} completed')
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# if not ctx._cancel_called:
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# await ctx.result()
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if cancel_on_exit:
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await ctx.cancel()
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# await recv_chan.aclose()
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else:
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if not ctx._cancel_called:
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await ctx.result()
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await recv_chan.aclose()
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# except TypeError:
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# # if fn_name == '_emsd_main':
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# import tractor
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# await tractor.breakpoint()
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except ContextCancelled:
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except ContextCancelled as err:
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_err = err
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if not ctx._cancel_called:
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# context was cancelled at the far end but was
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# not part of this end requesting that cancel
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# so raise for the local task to respond and handle.
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raise
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# if the context was cancelled by client code
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@ -431,16 +427,43 @@ class Portal:
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else:
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log.debug(f'Context {ctx} cancelled gracefully')
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except trio.Cancelled:
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# the context cancels itself on any deviation
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await ctx.cancel()
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except (
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trio.Cancelled,
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trio.MultiError,
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Exception,
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) as err:
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_err = err
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# the context cancels itself on any cancel
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# causing error.
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log.error(f'Context {ctx} sending cancel to far end')
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with trio.CancelScope(shield=True):
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await ctx.cancel()
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raise
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# finally:
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# log.info(f'Context for {func.__name__} completed')
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finally:
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result = await ctx.result()
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# finally:
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# if recv_chan is not None:
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# though it should be impossible for any tasks
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# operating *in* this scope to have survived
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# we tear down the runtime feeder chan last
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# to avoid premature stream clobbers.
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if recv_chan is not None:
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await recv_chan.aclose()
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if _err:
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if ctx._cancel_called:
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log.warning(
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f'Context {fn_name} cancelled by caller with\n{_err}'
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)
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elif _err is not None:
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log.warning(
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f'Context {fn_name} cancelled by callee with\n{_err}'
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)
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else:
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log.info(
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f'Context {fn_name} returned '
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f'value from callee `{self._result}`'
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)
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@dataclass
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@ -465,10 +488,12 @@ class LocalPortal:
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@asynccontextmanager
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async def open_portal(
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channel: Channel,
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nursery: Optional[trio.Nursery] = None,
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start_msg_loop: bool = True,
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shield: bool = False,
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) -> AsyncGenerator[Portal, None]:
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"""Open a ``Portal`` through the provided ``channel``.
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@ -508,6 +533,7 @@ async def open_portal(
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if was_connected:
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# gracefully signal remote channel-msg loop
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await channel.send(None)
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# await channel.aclose()
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# cancel background msg loop task
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if msg_loop_cs:
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@ -67,8 +67,6 @@ class ReceiveMsgStream(trio.abc.ReceiveChannel):
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raise trio.EndOfChannel
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try:
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# if self._ctx.chan.uid[0] == 'brokerd.ib':
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# breakpoint()
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msg = await self._rx_chan.receive()
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return msg['yield']
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@ -173,7 +171,7 @@ class ReceiveMsgStream(trio.abc.ReceiveChannel):
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# https://trio.readthedocs.io/en/stable/reference-io.html#trio.abc.AsyncResource.aclose
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rx_chan = self._rx_chan
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if rx_chan._closed: # or self._eoc:
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if rx_chan._closed: # or self._eoc:
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log.warning(f"{self} is already closed")
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# this stream has already been closed so silently succeed as
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@ -338,6 +336,12 @@ class Context:
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msg: Dict[str, Any],
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) -> None:
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'''Unpack and raise a msg error into the local scope
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nursery for this context.
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Acts as a form of "relay" for a remote error raised
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in the corresponding remote callee task.
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'''
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async def raiser():
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raise unpack_error(msg, self.chan)
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@ -350,11 +354,13 @@ class Context:
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Timeout quickly in an attempt to sidestep 2-generals...
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'''
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log.warning(f'Cancelling caller side of context {self}')
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side = 'caller' if self._portal else 'callee'
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log.warning(f'Cancelling {side} side of context to {self.chan}')
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self._cancel_called = True
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if self._portal: # caller side:
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if side == 'caller':
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if not self._portal:
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raise RuntimeError(
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"No portal found, this is likely a callee side context"
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@ -382,8 +388,8 @@ class Context:
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"May have failed to cancel remote task "
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f"{cid} for {self._portal.channel.uid}")
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else:
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# ensure callee side
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assert self._scope_nursery
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# callee side remote task
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# TODO: should we have an explicit cancel message
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# or is relaying the local `trio.Cancelled` as an
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# {'error': trio.Cancelled, cid: "blah"} enough?
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