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
|
|
@ -619,13 +619,15 @@ def _set_trace(
|
|||
actor: tractor.Actor | None = None,
|
||||
pdb: MultiActorPdb | None = None,
|
||||
shield: bool = False,
|
||||
|
||||
extra_frames_up_when_async: int = 1,
|
||||
):
|
||||
__tracebackhide__: bool = True
|
||||
actor: tractor.Actor = actor or current_actor()
|
||||
|
||||
# start 2 levels up in user code
|
||||
frame: FrameType | None = sys._getframe()
|
||||
if frame:
|
||||
# always start 1 level up from THIS in user code.
|
||||
frame: FrameType|None
|
||||
if frame := sys._getframe():
|
||||
frame: FrameType = frame.f_back # type: ignore
|
||||
|
||||
if (
|
||||
|
|
@ -633,23 +635,39 @@ def _set_trace(
|
|||
and (
|
||||
pdb
|
||||
and actor is not None
|
||||
) or shield
|
||||
)
|
||||
# or shield
|
||||
):
|
||||
msg: str = _pause_msg
|
||||
if shield:
|
||||
# log.warning(
|
||||
msg = (
|
||||
'\n\n'
|
||||
' ------ - ------\n'
|
||||
'Debugger invoked with `shield=True` so an extra\n'
|
||||
'`trio.CancelScope.__exit__()` frame is shown..\n'
|
||||
'\n'
|
||||
'Try going up one frame to see your pause point!\n'
|
||||
'\n'
|
||||
' SORRY we need to fix this!\n'
|
||||
' ------ - ------\n\n'
|
||||
) + msg
|
||||
|
||||
# pdbp.set_trace()
|
||||
# TODO: maybe print the actor supervion tree up to the
|
||||
# root here? Bo
|
||||
log.pdb(
|
||||
f'{_pause_msg}\n'
|
||||
f'{msg}\n'
|
||||
'|\n'
|
||||
f'|_ {actor.uid}\n'
|
||||
)
|
||||
# no f!#$&* idea, but when we're in async land
|
||||
# we need 2x frames up?
|
||||
frame = frame.f_back
|
||||
# frame = frame.f_back
|
||||
|
||||
# if shield:
|
||||
# frame = frame.f_back
|
||||
for i in range(extra_frames_up_when_async):
|
||||
frame: FrameType = frame.f_back
|
||||
log.debug(
|
||||
f'Going up frame {i} -> {frame}\n'
|
||||
)
|
||||
|
||||
else:
|
||||
pdb, undo_sigint = mk_mpdb()
|
||||
|
|
@ -659,10 +677,9 @@ def _set_trace(
|
|||
Lock.local_task_in_debug = 'sync'
|
||||
|
||||
pdb.set_trace(frame=frame)
|
||||
# undo_
|
||||
|
||||
|
||||
async def pause(
|
||||
async def _pause(
|
||||
|
||||
debug_func: Callable = _set_trace,
|
||||
release_lock_signal: trio.Event | None = None,
|
||||
|
|
@ -676,27 +693,19 @@ async def pause(
|
|||
# be no way to override it?..
|
||||
# shield: bool = False,
|
||||
|
||||
# TODO:
|
||||
# shield: bool = False
|
||||
shield: bool = False,
|
||||
task_status: TaskStatus[trio.Event] = trio.TASK_STATUS_IGNORED
|
||||
|
||||
) -> None:
|
||||
'''
|
||||
A pause point (more commonly known as a "breakpoint") interrupt
|
||||
instruction for engaging a blocking debugger instance to
|
||||
conduct manual console-based-REPL-interaction from within
|
||||
`tractor`'s async runtime, normally from some single-threaded
|
||||
and currently executing actor-hosted-`trio`-task in some
|
||||
(remote) process.
|
||||
Inner impl for `pause()` to avoid the `trio.CancelScope.__exit__()`
|
||||
stack frame when not shielded (since apparently i can't figure out
|
||||
how to hide it using the normal mechanisms..)
|
||||
|
||||
NOTE: we use the semantics "pause" since it better encompasses
|
||||
the entirety of the necessary global-runtime-state-mutation any
|
||||
actor-task must access and lock in order to get full isolated
|
||||
control over the process tree's root TTY:
|
||||
https://en.wikipedia.org/wiki/Breakpoint
|
||||
Hopefully we won't need this in the long run.
|
||||
|
||||
'''
|
||||
# __tracebackhide__ = True
|
||||
__tracebackhide__: bool = True
|
||||
actor = current_actor()
|
||||
pdb, undo_sigint = mk_mpdb()
|
||||
task_name: str = trio.lowlevel.current_task().name
|
||||
|
|
@ -707,24 +716,11 @@ async def pause(
|
|||
):
|
||||
Lock.local_pdb_complete = trio.Event()
|
||||
|
||||
# if shield:
|
||||
debug_func = partial(
|
||||
debug_func,
|
||||
# shield=shield,
|
||||
)
|
||||
|
||||
# def _exit(self, *args, **kwargs):
|
||||
# __tracebackhide__: bool = True
|
||||
# super().__exit__(*args, **kwargs)
|
||||
|
||||
# trio.CancelScope.__exit__.__tracebackhide__ = True
|
||||
|
||||
# import types
|
||||
# with trio.CancelScope(shield=shield) as cs:
|
||||
# cs.__exit__ = types.MethodType(_exit, cs)
|
||||
# cs.__exit__.__tracebackhide__ = True
|
||||
|
||||
# TODO: need a more robust check for the "root" actor
|
||||
# TODO: need a more robust check for the "root" actor
|
||||
if (
|
||||
not is_root_process()
|
||||
and actor._parent_chan # a connected child
|
||||
|
|
@ -818,7 +814,7 @@ async def pause(
|
|||
# 'trace func provided!'
|
||||
# )
|
||||
print(f"{actor.uid} ENTERING WAIT")
|
||||
task_status.started()
|
||||
task_status.started(cs)
|
||||
|
||||
# with trio.CancelScope(shield=True):
|
||||
# await release_lock_signal.wait()
|
||||
|
|
@ -827,22 +823,103 @@ async def pause(
|
|||
# block here one (at the appropriate frame *up*) where
|
||||
# ``breakpoint()`` was awaited and begin handling stdio.
|
||||
log.debug("Entering the synchronous world of pdb")
|
||||
debug_func(actor, pdb)
|
||||
debug_func(
|
||||
actor,
|
||||
pdb,
|
||||
extra_frames_up_when_async=2,
|
||||
shield=shield,
|
||||
)
|
||||
assert cs
|
||||
|
||||
except bdb.BdbQuit:
|
||||
Lock.release()
|
||||
raise
|
||||
|
||||
# XXX: apparently we can't do this without showing this frame
|
||||
# in the backtrace on first entry to the REPL? Seems like an odd
|
||||
# behaviour that should have been fixed by now. This is also why
|
||||
# we scrapped all the @cm approaches that were tried previously.
|
||||
# finally:
|
||||
# __tracebackhide__ = True
|
||||
# # frame = sys._getframe()
|
||||
# # last_f = frame.f_back
|
||||
# # last_f.f_globals['__tracebackhide__'] = True
|
||||
# # signal.signal = pdbp.hideframe(signal.signal)
|
||||
# XXX: apparently we can't do this without showing this frame
|
||||
# in the backtrace on first entry to the REPL? Seems like an odd
|
||||
# behaviour that should have been fixed by now. This is also why
|
||||
# we scrapped all the @cm approaches that were tried previously.
|
||||
# finally:
|
||||
# __tracebackhide__ = True
|
||||
# # frame = sys._getframe()
|
||||
# # last_f = frame.f_back
|
||||
# # last_f.f_globals['__tracebackhide__'] = True
|
||||
# # signal.signal = pdbp.hideframe(signal.signal)
|
||||
|
||||
|
||||
async def pause(
|
||||
|
||||
debug_func: Callable = _set_trace,
|
||||
release_lock_signal: trio.Event | None = None,
|
||||
|
||||
# TODO: allow caller to pause despite task cancellation,
|
||||
# exactly the same as wrapping with:
|
||||
# with CancelScope(shield=True):
|
||||
# await pause()
|
||||
# => the REMAINING ISSUE is that the scope's .__exit__() frame
|
||||
# is always show in the debugger on entry.. and there seems to
|
||||
# be no way to override it?..
|
||||
# shield: bool = False,
|
||||
|
||||
shield: bool = False,
|
||||
task_status: TaskStatus[trio.Event] = trio.TASK_STATUS_IGNORED
|
||||
|
||||
) -> None:
|
||||
'''
|
||||
A pause point (more commonly known as a "breakpoint") interrupt
|
||||
instruction for engaging a blocking debugger instance to
|
||||
conduct manual console-based-REPL-interaction from within
|
||||
`tractor`'s async runtime, normally from some single-threaded
|
||||
and currently executing actor-hosted-`trio`-task in some
|
||||
(remote) process.
|
||||
|
||||
NOTE: we use the semantics "pause" since it better encompasses
|
||||
the entirety of the necessary global-runtime-state-mutation any
|
||||
actor-task must access and lock in order to get full isolated
|
||||
control over the process tree's root TTY:
|
||||
https://en.wikipedia.org/wiki/Breakpoint
|
||||
|
||||
'''
|
||||
__tracebackhide__: bool = True
|
||||
|
||||
if shield:
|
||||
# NOTE XXX: even hard coding this inside the `class CancelScope:`
|
||||
# doesn't seem to work for me!?
|
||||
# ^ XXX ^
|
||||
|
||||
# def _exit(self, *args, **kwargs):
|
||||
# __tracebackhide__: bool = True
|
||||
# super().__exit__(*args, **kwargs)
|
||||
|
||||
trio.CancelScope.__enter__.__tracebackhide__ = True
|
||||
trio.CancelScope.__exit__.__tracebackhide__ = True
|
||||
|
||||
# import types
|
||||
# with trio.CancelScope(shield=shield) as cs:
|
||||
# cs.__exit__ = types.MethodType(_exit, cs)
|
||||
# cs.__exit__.__tracebackhide__ = True
|
||||
|
||||
with trio.CancelScope(shield=shield) as cs:
|
||||
# setattr(cs.__exit__.__func__, '__tracebackhide__', True)
|
||||
# setattr(cs.__enter__.__func__, '__tracebackhide__', True)
|
||||
|
||||
# NOTE: so the caller can always cancel even if shielded
|
||||
task_status.started(cs)
|
||||
await _pause(
|
||||
debug_func=debug_func,
|
||||
release_lock_signal=release_lock_signal,
|
||||
shield=True,
|
||||
task_status=task_status,
|
||||
)
|
||||
else:
|
||||
await _pause(
|
||||
debug_func=debug_func,
|
||||
release_lock_signal=release_lock_signal,
|
||||
shield=False,
|
||||
task_status=task_status,
|
||||
)
|
||||
|
||||
|
||||
|
||||
|
||||
# TODO: allow pausing from sync code.
|
||||
|
|
@ -1043,12 +1120,20 @@ async def maybe_wait_for_debugger(
|
|||
# will make the pdb repl unusable.
|
||||
# Instead try to wait for pdb to be released before
|
||||
# tearing down.
|
||||
sub_in_debug: tuple[str, str]|None = Lock.global_actor_in_debug
|
||||
in_debug: tuple[str, str]|None = Lock.global_actor_in_debug
|
||||
debug_complete: trio.Event|None = Lock.no_remote_has_tty
|
||||
|
||||
if sub_in_debug := Lock.global_actor_in_debug:
|
||||
if in_debug == current_actor().uid:
|
||||
log.debug(
|
||||
msg
|
||||
+
|
||||
'Root already owns the TTY LOCK'
|
||||
)
|
||||
return True
|
||||
|
||||
elif in_debug:
|
||||
msg += (
|
||||
f'Debug `Lock` in use by subactor: {sub_in_debug}\n'
|
||||
f'Debug `Lock` in use by subactor: {in_debug}\n'
|
||||
)
|
||||
# TODO: could this make things more deterministic?
|
||||
# wait to see if a sub-actor task will be
|
||||
|
|
@ -1065,27 +1150,26 @@ async def maybe_wait_for_debugger(
|
|||
return False
|
||||
|
||||
for istep in range(poll_steps):
|
||||
|
||||
|
||||
if (
|
||||
debug_complete
|
||||
and not debug_complete.is_set()
|
||||
and sub_in_debug is not None
|
||||
and in_debug is not None
|
||||
):
|
||||
log.pdb(
|
||||
msg
|
||||
+
|
||||
'Root is waiting on tty lock to release..\n'
|
||||
)
|
||||
await debug_complete.wait()
|
||||
with trio.CancelScope(shield=True):
|
||||
await debug_complete.wait()
|
||||
log.pdb(
|
||||
f'Child subactor released debug lock:'
|
||||
f'|_{sub_in_debug}\n'
|
||||
f'|_{in_debug}\n'
|
||||
)
|
||||
|
||||
# is no subactor locking debugger currently?
|
||||
if (
|
||||
sub_in_debug is None
|
||||
in_debug is None
|
||||
and (
|
||||
debug_complete is None
|
||||
or debug_complete.is_set()
|
||||
|
|
|
|||
Loading…
Reference in New Issue