forked from goodboy/tractor
Add `shield: bool` support to `.pause()`
It's been on the todo for a while and I've given up trying to properly hide the `trio.CancelScope.__exit__()` frame for now instead opting to just `log.pdb()` a big apology XD Users can obvi still just not use the flag and wrap `tractor.pause()` in their own cs block if they want to avoid having to hit `'up'` in the pdb REPL if needed in a cancelled task-scope. Impl deatz: - factor orig `.pause()` impl into new `._pause()` so that we can more tersely wrap the original content depending on `shield: bool` input; only open the cancel-scope when shield is set to avoid aforemented extra strack frame annoyance. - pass through `shield` to underlying `_pause` and `debug_func()` so we can actually know when so log our apology. - add a buncha notes to new `.pause()` wrapper regarding the inability to hide the cancel-scope `.__exit__()`, inluding that overriding the code in `trio._core._run.CancelScope` doesn't seem to solve the issue either.. Unrelated `maybe_wait_for_debugger()` tweaks: - don't read `Lock.global_actor_in_debug` more then needed, rename local read var to `in_debug` (since it can also hold the root actor uid, not just sub-actors). - shield the `await debug_complete.wait()` since ideally we avoid the root cancellation child-actors in debug even when the root calls this func in a cancelled scope.modden_spawn_from_client_req
Tyler Goodlet
parent
9e3f41a5b1
commit
6156ff95f8
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@ -619,13 +619,15 @@ def _set_trace(
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actor: tractor.Actor | None = None,
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pdb: MultiActorPdb | None = None,
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shield: bool = False,
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extra_frames_up_when_async: int = 1,
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):
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__tracebackhide__: bool = True
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actor: tractor.Actor = actor or current_actor()
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# start 2 levels up in user code
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frame: FrameType | None = sys._getframe()
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if frame:
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# always start 1 level up from THIS in user code.
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frame: FrameType|None
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if frame := sys._getframe():
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frame: FrameType = frame.f_back # type: ignore
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if (
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@ -633,23 +635,39 @@ def _set_trace(
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and (
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pdb
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and actor is not None
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) or shield
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)
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# or shield
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):
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msg: str = _pause_msg
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if shield:
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# log.warning(
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msg = (
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'\n\n'
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' ------ - ------\n'
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'Debugger invoked with `shield=True` so an extra\n'
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'`trio.CancelScope.__exit__()` frame is shown..\n'
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'\n'
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'Try going up one frame to see your pause point!\n'
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'\n'
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' SORRY we need to fix this!\n'
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' ------ - ------\n\n'
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) + msg
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# pdbp.set_trace()
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# TODO: maybe print the actor supervion tree up to the
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# root here? Bo
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log.pdb(
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f'{_pause_msg}\n'
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f'{msg}\n'
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'|\n'
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f'|_ {actor.uid}\n'
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)
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# no f!#$&* idea, but when we're in async land
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# we need 2x frames up?
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frame = frame.f_back
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# frame = frame.f_back
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# if shield:
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# frame = frame.f_back
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for i in range(extra_frames_up_when_async):
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frame: FrameType = frame.f_back
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log.debug(
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f'Going up frame {i} -> {frame}\n'
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)
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else:
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pdb, undo_sigint = mk_mpdb()
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@ -659,10 +677,9 @@ def _set_trace(
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Lock.local_task_in_debug = 'sync'
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pdb.set_trace(frame=frame)
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# undo_
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async def pause(
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async def _pause(
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debug_func: Callable = _set_trace,
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release_lock_signal: trio.Event | None = None,
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@ -676,27 +693,19 @@ async def pause(
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# be no way to override it?..
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# shield: bool = False,
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# TODO:
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# shield: bool = False
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shield: bool = False,
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task_status: TaskStatus[trio.Event] = trio.TASK_STATUS_IGNORED
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) -> None:
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'''
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A pause point (more commonly known as a "breakpoint") interrupt
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instruction for engaging a blocking debugger instance to
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conduct manual console-based-REPL-interaction from within
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`tractor`'s async runtime, normally from some single-threaded
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and currently executing actor-hosted-`trio`-task in some
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(remote) process.
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Inner impl for `pause()` to avoid the `trio.CancelScope.__exit__()`
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stack frame when not shielded (since apparently i can't figure out
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how to hide it using the normal mechanisms..)
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NOTE: we use the semantics "pause" since it better encompasses
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the entirety of the necessary global-runtime-state-mutation any
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actor-task must access and lock in order to get full isolated
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control over the process tree's root TTY:
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https://en.wikipedia.org/wiki/Breakpoint
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Hopefully we won't need this in the long run.
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'''
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# __tracebackhide__ = True
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__tracebackhide__: bool = True
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actor = current_actor()
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pdb, undo_sigint = mk_mpdb()
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task_name: str = trio.lowlevel.current_task().name
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@ -707,23 +716,10 @@ async def pause(
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):
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Lock.local_pdb_complete = trio.Event()
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# if shield:
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debug_func = partial(
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debug_func,
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# shield=shield,
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)
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# def _exit(self, *args, **kwargs):
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# __tracebackhide__: bool = True
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# super().__exit__(*args, **kwargs)
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# trio.CancelScope.__exit__.__tracebackhide__ = True
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# import types
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# with trio.CancelScope(shield=shield) as cs:
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# cs.__exit__ = types.MethodType(_exit, cs)
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# cs.__exit__.__tracebackhide__ = True
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# TODO: need a more robust check for the "root" actor
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if (
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not is_root_process()
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@ -818,7 +814,7 @@ async def pause(
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# 'trace func provided!'
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# )
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print(f"{actor.uid} ENTERING WAIT")
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task_status.started()
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task_status.started(cs)
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# with trio.CancelScope(shield=True):
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# await release_lock_signal.wait()
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@ -827,22 +823,103 @@ async def pause(
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# block here one (at the appropriate frame *up*) where
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# ``breakpoint()`` was awaited and begin handling stdio.
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log.debug("Entering the synchronous world of pdb")
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debug_func(actor, pdb)
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debug_func(
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actor,
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pdb,
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extra_frames_up_when_async=2,
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shield=shield,
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)
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assert cs
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except bdb.BdbQuit:
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Lock.release()
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raise
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# XXX: apparently we can't do this without showing this frame
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# in the backtrace on first entry to the REPL? Seems like an odd
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# behaviour that should have been fixed by now. This is also why
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# we scrapped all the @cm approaches that were tried previously.
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# finally:
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# __tracebackhide__ = True
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# # frame = sys._getframe()
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# # last_f = frame.f_back
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# # last_f.f_globals['__tracebackhide__'] = True
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# # signal.signal = pdbp.hideframe(signal.signal)
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# XXX: apparently we can't do this without showing this frame
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# in the backtrace on first entry to the REPL? Seems like an odd
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# behaviour that should have been fixed by now. This is also why
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# we scrapped all the @cm approaches that were tried previously.
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# finally:
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# __tracebackhide__ = True
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# # frame = sys._getframe()
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# # last_f = frame.f_back
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# # last_f.f_globals['__tracebackhide__'] = True
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# # signal.signal = pdbp.hideframe(signal.signal)
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async def pause(
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debug_func: Callable = _set_trace,
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release_lock_signal: trio.Event | None = None,
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# TODO: allow caller to pause despite task cancellation,
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# exactly the same as wrapping with:
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# with CancelScope(shield=True):
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# await pause()
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# => the REMAINING ISSUE is that the scope's .__exit__() frame
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# is always show in the debugger on entry.. and there seems to
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# be no way to override it?..
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# shield: bool = False,
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shield: bool = False,
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task_status: TaskStatus[trio.Event] = trio.TASK_STATUS_IGNORED
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) -> None:
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'''
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A pause point (more commonly known as a "breakpoint") interrupt
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instruction for engaging a blocking debugger instance to
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conduct manual console-based-REPL-interaction from within
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`tractor`'s async runtime, normally from some single-threaded
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and currently executing actor-hosted-`trio`-task in some
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(remote) process.
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NOTE: we use the semantics "pause" since it better encompasses
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the entirety of the necessary global-runtime-state-mutation any
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actor-task must access and lock in order to get full isolated
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control over the process tree's root TTY:
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https://en.wikipedia.org/wiki/Breakpoint
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'''
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__tracebackhide__: bool = True
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if shield:
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# NOTE XXX: even hard coding this inside the `class CancelScope:`
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# doesn't seem to work for me!?
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# ^ XXX ^
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# def _exit(self, *args, **kwargs):
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# __tracebackhide__: bool = True
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# super().__exit__(*args, **kwargs)
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trio.CancelScope.__enter__.__tracebackhide__ = True
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trio.CancelScope.__exit__.__tracebackhide__ = True
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# import types
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# with trio.CancelScope(shield=shield) as cs:
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# cs.__exit__ = types.MethodType(_exit, cs)
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# cs.__exit__.__tracebackhide__ = True
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with trio.CancelScope(shield=shield) as cs:
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# setattr(cs.__exit__.__func__, '__tracebackhide__', True)
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# setattr(cs.__enter__.__func__, '__tracebackhide__', True)
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# NOTE: so the caller can always cancel even if shielded
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task_status.started(cs)
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await _pause(
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debug_func=debug_func,
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release_lock_signal=release_lock_signal,
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shield=True,
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task_status=task_status,
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)
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else:
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await _pause(
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debug_func=debug_func,
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release_lock_signal=release_lock_signal,
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shield=False,
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task_status=task_status,
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)
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# TODO: allow pausing from sync code.
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@ -1043,12 +1120,20 @@ async def maybe_wait_for_debugger(
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# will make the pdb repl unusable.
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# Instead try to wait for pdb to be released before
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# tearing down.
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sub_in_debug: tuple[str, str]|None = Lock.global_actor_in_debug
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in_debug: tuple[str, str]|None = Lock.global_actor_in_debug
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debug_complete: trio.Event|None = Lock.no_remote_has_tty
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if sub_in_debug := Lock.global_actor_in_debug:
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if in_debug == current_actor().uid:
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log.debug(
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msg
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+
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'Root already owns the TTY LOCK'
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)
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return True
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elif in_debug:
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msg += (
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f'Debug `Lock` in use by subactor: {sub_in_debug}\n'
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f'Debug `Lock` in use by subactor: {in_debug}\n'
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)
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# TODO: could this make things more deterministic?
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# wait to see if a sub-actor task will be
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@ -1065,27 +1150,26 @@ async def maybe_wait_for_debugger(
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return False
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for istep in range(poll_steps):
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if (
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debug_complete
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and not debug_complete.is_set()
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and sub_in_debug is not None
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and in_debug is not None
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):
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log.pdb(
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msg
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+
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'Root is waiting on tty lock to release..\n'
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)
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with trio.CancelScope(shield=True):
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await debug_complete.wait()
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log.pdb(
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f'Child subactor released debug lock:'
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f'|_{sub_in_debug}\n'
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f'|_{in_debug}\n'
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)
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# is no subactor locking debugger currently?
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if (
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sub_in_debug is None
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in_debug is None
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and (
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debug_complete is None
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or debug_complete.is_set()
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