Avoid `ctx.cancel()` after ctxc rxed in `.open_context()`
In the case where the callee side delivers us a ctxc with `.canceller` set we can presume that remote cancellation already has taken place and thus we don't need to do the normal call-`Context.cancel()`-on-error step. Further, in the case where we do call it also handle any `trio.CloseResourceError` gracefully with a `.warning()`. Also, originally I had added a post-`yield`-maybe-raise to attempt handling any remote ctxc the same as for the local case (i.e. raised from `yield` line) wherein if we get a remote ctxc the same handler branch-path would trigger, thus avoiding different behaviour in that case. I ended up masking it out (but can't member why.. ) as it seems the normal `.result()` call and its internal handling gets the same behaviour? I've left in the heavily commented code in case it ends up being the better way to go; likely making the move to having a single code in both cases is better even if it is just a matter of deciding whether to swallow the ctxc or not in the `.cancel_acked` case. Further teensie improvements: - obvi improve/simplify log msg contents as in prior patches. - use the new `maybe_wait_for_debugger(header_msg: str)` if/when waiting to exit in debug mode. - another `hide_tb: bool` frame hider flag. - rando type-annot updates of course :)modden_spawn_from_client_req
Tyler Goodlet
parent
299429a278
commit
ed10632d97
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@ -27,8 +27,9 @@ from __future__ import annotations
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import importlib
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import inspect
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from typing import (
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Any, Optional,
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Callable, AsyncGenerator,
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Any,
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Callable,
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AsyncGenerator,
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Type,
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)
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from functools import partial
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@ -52,6 +53,7 @@ from ._ipc import Channel
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from .log import get_logger
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from .msg import NamespacePath
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from ._exceptions import (
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InternalError,
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_raise_from_no_key_in_msg,
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unpack_error,
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NoResult,
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@ -126,7 +128,7 @@ class Portal:
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def __init__(self, channel: Channel) -> None:
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self.chan = channel
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# during the portal's lifetime
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self._result_msg: Optional[dict] = None
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self._result_msg: dict|None = None
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# When set to a ``Context`` (when _submit_for_result is called)
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# it is expected that ``result()`` will be awaited at some
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@ -171,7 +173,7 @@ class Portal:
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) -> dict[str, Any]:
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assert ctx._remote_func_type == 'asyncfunc' # single response
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msg = await ctx._recv_chan.receive()
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msg: dict = await ctx._recv_chan.receive()
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return msg
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async def result(self) -> Any:
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@ -255,11 +257,11 @@ class Portal:
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return False
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reminfo: str = (
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f'uid: {self.channel.uid}\n'
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f' |_{chan}\n'
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f'{self.channel.uid}\n'
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f' |_{chan}\n'
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)
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log.cancel(
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f'Sending actor cancel request to peer\n'
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f'Sending runtime `.cancel()` request to peer\n\n'
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f'{reminfo}'
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)
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@ -281,7 +283,9 @@ class Portal:
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return True
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if cs.cancelled_caught:
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log.cancel(
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# may timeout and we never get an ack (obvi racy)
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# but that doesn't mean it wasn't cancelled.
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log.debug(
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'May have failed to cancel peer?\n'
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f'{reminfo}'
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)
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@ -293,9 +297,11 @@ class Portal:
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trio.ClosedResourceError,
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trio.BrokenResourceError,
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):
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log.cancel(
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f"{self.channel} for {self.channel.uid} was already "
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"closed or broken?")
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log.debug(
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'IPC chan for actor already closed or broken?\n\n'
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f'{self.channel.uid}\n'
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f' |_{self.channel}\n'
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)
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return False
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async def run_from_ns(
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@ -416,7 +422,8 @@ class Portal:
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try:
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# deliver receive only stream
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async with MsgStream(
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ctx, ctx._recv_chan,
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ctx=ctx,
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rx_chan=ctx._recv_chan,
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) as rchan:
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self._streams.add(rchan)
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yield rchan
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@ -443,6 +450,11 @@ class Portal:
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# await recv_chan.aclose()
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self._streams.remove(rchan)
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# TODO: move this impl to `._context` mod and
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# instead just bind it here as a method so that the logic
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# for ctx stuff stays all in one place (instead of frickin
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# having to open this file in tandem every gd time!!! XD)
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#
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@asynccontextmanager
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async def open_context(
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@ -451,6 +463,11 @@ class Portal:
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allow_overruns: bool = False,
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# TODO: if we set this the wrapping `@acm` body will
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# still be shown (awkwardly) on pdb REPL entry. Ideally
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# we can similarly annotate that frame to NOT show?
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hide_tb: bool = False,
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# proxied to RPC
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**kwargs,
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@ -484,6 +501,8 @@ class Portal:
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collection. See ``tractor.Context`` for more details.
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'''
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__tracebackhide__: bool = hide_tb
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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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@ -536,9 +555,12 @@ class Portal:
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# placeholder for any exception raised in the runtime
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# or by user tasks which cause this context's closure.
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scope_err: BaseException | None = None
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scope_err: BaseException|None = None
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ctxc_from_callee: ContextCancelled|None = None
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try:
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async with trio.open_nursery() as nurse:
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# NOTE: used to start overrun queuing tasks
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ctx._scope_nursery: trio.Nursery = nurse
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ctx._scope: trio.CancelScope = nurse.cancel_scope
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@ -546,14 +568,26 @@ class Portal:
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# in enter tuple.
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yield ctx, first
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# between the caller exiting and arriving here the
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# far end may have sent a ctxc-msg or other error,
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# so check for it here immediately and maybe raise
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# so as to engage the ctxc handling block below!
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# ??TODO??: do we still want to consider this or is
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# the `else:` block handling via a `.result()`
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# call below enough??
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# -[ ] pretty sure `.result()` internals do the
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# same as our ctxc handler below so it ended up
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# being same (repeated?) behaviour, but ideally we
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# wouldn't have that duplication either by somehow
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# factoring the `.result()` handler impl in a way
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# that we can re-use it around the `yield` ^ here
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# or vice versa?
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#
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# NOTE: between the caller exiting and arriving
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# here the far end may have sent a ctxc-msg or
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# other error, so check for it here immediately
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# and maybe raise so as to engage the ctxc
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# handling block below!
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#
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# if re := ctx._remote_error:
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# maybe_ctxc: ContextCancelled|None = ctx._maybe_raise_remote_err(
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# re,
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# # TODO: do we want this to always raise?
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# # - means that on self-ctxc, if/when the
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# # block is exited before the msg arrives
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@ -571,7 +605,7 @@ class Portal:
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# # block?
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# raise_ctxc_from_self_call=True,
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# )
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# assert maybe_ctxc
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# ctxc_from_callee = maybe_ctxc
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# when in allow_overruns mode there may be
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# lingering overflow sender tasks remaining?
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@ -583,13 +617,18 @@ class Portal:
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not ctx._allow_overruns
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or len(nurse.child_tasks) > 1
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):
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raise RuntimeError(
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raise InternalError(
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'Context has sub-tasks but is '
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'not in `allow_overruns=True` mode!?'
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)
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# ensure cancel of all overflow sender tasks
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# started in the ctx nursery.
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# ensure we cancel all overflow sender
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# tasks started in the nursery when
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# `._allow_overruns == True`.
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#
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# NOTE: this means `._scope.cancelled_caught`
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# will prolly be set! not sure if that's
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# non-ideal or not ???
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ctx._scope.cancel()
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# XXX NOTE XXX: maybe shield against
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@ -602,14 +641,15 @@ class Portal:
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# of a `Context`. In both cases any `ContextCancelled`
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# raised in this scope-block came from a transport msg
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# relayed from some remote-actor-task which our runtime set
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# as a `Context._remote_error`
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# as to `Context._remote_error`
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#
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# the CASES:
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#
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# - if that context IS THE SAME ONE that called
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# `Context.cancel()`, we want to absorb the error
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# silently and let this `.open_context()` block to exit
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# without raising.
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# without raising, ideally eventually receiving the ctxc
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# ack msg thus resulting in `ctx.cancel_acked == True`.
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#
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# - if it is from some OTHER context (we did NOT call
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# `.cancel()`), we want to re-RAISE IT whilst also
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@ -633,6 +673,7 @@ class Portal:
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# `Nursery.cancel_scope.cancel()`)
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except ContextCancelled as ctxc:
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scope_err = ctxc
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ctxc_from_callee = ctxc
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# XXX TODO XXX: FIX THIS debug_mode BUGGGG!!!
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# using this code and then resuming the REPL will
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@ -642,6 +683,7 @@ class Portal:
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# documenting it as a definittive example of
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# debugging the tractor-runtime itself using it's
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# own `.devx.` tooling!
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#
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# await pause()
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# CASE 2: context was cancelled by local task calling
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@ -649,15 +691,10 @@ class Portal:
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# exit silently.
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if (
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ctx._cancel_called
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and (
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ctxc is ctx._remote_error
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# ctxc.msgdata == ctx._remote_error.msgdata
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# TODO: uhh `Portal.canceller` ain't a thangg
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# dawg? (was `self.canceller` before?!?)
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and
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ctxc.canceller == self.actor.uid
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)
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and
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ctxc is ctx._remote_error
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and
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ctxc.canceller == self.actor.uid
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):
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log.cancel(
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f'Context (cid=[{ctx.cid[-6:]}..] cancelled gracefully with:\n'
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@ -665,9 +702,9 @@ class Portal:
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)
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# CASE 1: this context was never cancelled via a local
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# task (tree) having called `Context.cancel()`, raise
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# the error since it was caused by someone else!
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# the error since it was caused by someone else
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# -> probably a remote peer!
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else:
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# await pause()
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raise
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# the above `._scope` can be cancelled due to:
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@ -680,19 +717,29 @@ class Portal:
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# CASE 3: standard local error in this caller/yieldee
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Exception,
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# CASES 1 & 2: normally manifested as
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# a `Context._scope_nursery` raised
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# CASES 1 & 2: can manifest as a `ctx._scope_nursery`
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# exception-group of,
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#
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# 1.-`trio.Cancelled`s, since
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# `._scope.cancel()` will have been called and any
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# `ContextCancelled` absorbed and thus NOT RAISED in
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# any `Context._maybe_raise_remote_err()`,
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# `._scope.cancel()` will have been called
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# (transitively by the runtime calling
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# `._deliver_msg()`) and any `ContextCancelled`
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# eventually absorbed and thus absorbed/supressed in
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# any `Context._maybe_raise_remote_err()` call.
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#
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# 2.-`BaseExceptionGroup[ContextCancelled | RemoteActorError]`
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# from any error raised in the "callee" side with
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# a group only raised if there was any more then one
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# task started here in the "caller" in the
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# `yield`-ed to task.
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BaseExceptionGroup, # since overrun handler tasks may have been spawned
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# from any error delivered from the "callee" side
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# AND a group-exc is only raised if there was > 1
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# tasks started *here* in the "caller" / opener
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# block. If any one of those tasks calls
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# `.result()` or `MsgStream.receive()`
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# `._maybe_raise_remote_err()` will be transitively
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# called and the remote error raised causing all
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# tasks to be cancelled.
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# NOTE: ^ this case always can happen if any
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# overrun handler tasks were spawned!
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BaseExceptionGroup,
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trio.Cancelled, # NOTE: NOT from inside the ctx._scope
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KeyboardInterrupt,
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@ -702,69 +749,48 @@ class Portal:
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# XXX: ALWAYS request the context to CANCEL ON any ERROR.
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# NOTE: `Context.cancel()` is conversely NEVER CALLED in
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# the `ContextCancelled` "self cancellation absorbed" case
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# handled in the block above!
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# handled in the block above ^^^ !!
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log.cancel(
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'Context cancelled for task due to\n'
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'Context terminated due to\n\n'
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f'{caller_err}\n'
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'Sending cancel request..\n'
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f'task:{cid}\n'
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f'actor:{uid}'
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)
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if debug_mode():
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log.pdb(
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'Delaying `ctx.cancel()` until debug lock '
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'acquired..'
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)
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# async with acquire_debug_lock(self.actor.uid):
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# pass
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# TODO: factor ^ into below for non-root cases?
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await maybe_wait_for_debugger()
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log.pdb(
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'Acquired debug lock! '
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'Calling `ctx.cancel()`!'
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was_acquired: bool = await maybe_wait_for_debugger(
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header_msg=(
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'Delaying `ctx.cancel()` until debug lock '
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'acquired..\n'
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),
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)
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if was_acquired:
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log.pdb(
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'Acquired debug lock! '
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'Calling `ctx.cancel()`!\n'
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)
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try:
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await ctx.cancel()
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except trio.BrokenResourceError:
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log.warning(
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'IPC connection for context is broken?\n'
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f'task:{cid}\n'
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f'actor:{uid}'
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)
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# we don't need to cancel the callee if it already
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# told us it's cancelled ;p
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if ctxc_from_callee is None:
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try:
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await ctx.cancel()
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except (
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trio.BrokenResourceError,
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trio.ClosedResourceError,
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):
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log.warning(
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'IPC connection for context is broken?\n'
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f'task:{cid}\n'
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f'actor:{uid}'
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)
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raise # duh
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# no local scope error, the "clean exit with a result" case.
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else:
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# between the caller exiting and arriving here the
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# far end may have sent a ctxc-msg or other error,
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# so check for it here immediately and maybe raise
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# so as to engage the ctxc handling block below!
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# if re := ctx._remote_error:
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# maybe_ctxc: ContextCancelled|None = ctx._maybe_raise_remote_err(
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# re,
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# # TODO: do we want this to always raise?
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# # - means that on self-ctxc, if/when the
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# # block is exited before the msg arrives
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# # but then the msg during __exit__
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# # calling we may not activate the
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# # ctxc-handler block below? should we
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# # be?
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# # - if there's a remote error that arrives
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# # after the child has exited, we won't
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# # handle until the `finally:` block
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# # where `.result()` is always called,
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# # again in which case we handle it
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# # differently then in the handler block
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# # that would normally engage from THIS
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# # block?
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# raise_ctxc_from_self_call=True,
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# )
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# assert maybe_ctxc
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if ctx.chan.connected():
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log.runtime(
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'Waiting on final context result for\n'
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@ -794,16 +820,18 @@ class Portal:
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scope_err = berr
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raise
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# yes! this worx Bp
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# from .devx import _debug
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# await _debug.pause()
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# an exception type boxed in a `RemoteActorError`
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# is returned (meaning it was obvi not raised).
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# is returned (meaning it was obvi not raised)
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# that we want to log-report on.
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msgdata: str|None = getattr(
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result_or_err,
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'msgdata',
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None
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)
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# yes! this worx Bp
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# from .devx import _debug
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# await _debug.pause()
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match (msgdata, result_or_err):
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case (
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{'tb_str': tbstr},
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|
|
@ -846,9 +874,8 @@ class Portal:
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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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rxchan: trio.ReceiveChannel = ctx._recv_chan
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if (
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rxchan
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(rxchan := ctx._recv_chan)
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|
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# maybe TODO: yes i know the below check is
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# touching `trio` memchan internals..BUT, there are
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|
|
@ -904,22 +931,27 @@ class Portal:
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etype: Type[BaseException] = type(scope_err)
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|
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# CASE 2
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if ctx._cancel_called:
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if (
|
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ctx._cancel_called
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and ctx.cancel_acked
|
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):
|
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log.cancel(
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'Context cancelled by caller task\n'
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f'|_{ctx._task}\n\n'
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|
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f'{etype}'
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f'{repr(scope_err)}\n'
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)
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|
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# TODO: should we add a `._cancel_req_received`
|
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# flag to determine if the callee manually called
|
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# `ctx.cancel()`?
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||||
# -[ ] going to need a cid check no?
|
||||
|
||||
# CASE 1
|
||||
else:
|
||||
log.cancel(
|
||||
f'Context cancelled by remote callee task\n'
|
||||
f'peer: {uid}\n'
|
||||
f'|_ {nsf}()\n\n'
|
||||
|
||||
f'{etype}\n'
|
||||
f'Context terminated due to local scope error:\n'
|
||||
f'{etype.__name__}\n'
|
||||
)
|
||||
|
||||
# FINALLY, remove the context from runtime tracking and
|
||||
|
|
@ -967,7 +999,7 @@ class LocalPortal:
|
|||
async def open_portal(
|
||||
|
||||
channel: Channel,
|
||||
nursery: Optional[trio.Nursery] = None,
|
||||
nursery: trio.Nursery|None = None,
|
||||
start_msg_loop: bool = True,
|
||||
shield: bool = False,
|
||||
|
||||
|
|
@ -992,7 +1024,7 @@ async def open_portal(
|
|||
if channel.uid is None:
|
||||
await actor._do_handshake(channel)
|
||||
|
||||
msg_loop_cs: Optional[trio.CancelScope] = None
|
||||
msg_loop_cs: trio.CancelScope|None = None
|
||||
if start_msg_loop:
|
||||
from ._runtime import process_messages
|
||||
msg_loop_cs = await nursery.start(
|
||||
|
|
|
|||
Loading…
Reference in New Issue