forked from goodboy/tractor
Comment all `.pause(shield=True)` attempts again, need to solve cancel scope `.__exit__()` frame hiding issue..
Tyler Goodlet
parent
575a24adf1
commit
6d951c526a
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@ -631,6 +631,7 @@ def _set_trace(
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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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@ -646,17 +647,19 @@ def _set_trace(
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# undo_
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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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# allow caller to pause despite task cancellation,
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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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shield: bool = False,
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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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# TODO:
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# shield: bool = False
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@ -689,133 +692,142 @@ 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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# 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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with trio.CancelScope(shield=shield):
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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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and actor._parent_chan # a connected child
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):
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if (
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not is_root_process()
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and actor._parent_chan # a connected child
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):
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if Lock.local_task_in_debug:
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if Lock.local_task_in_debug:
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# Recurrence entry case: this task already has the lock and
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# is likely recurrently entering a breakpoint
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if Lock.local_task_in_debug == task_name:
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# noop on recurrent entry case but we want to trigger
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# a checkpoint to allow other actors error-propagate and
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# potetially avoid infinite re-entries in some subactor.
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await trio.lowlevel.checkpoint()
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return
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# if **this** actor is already in debug mode block here
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# waiting for the control to be released - this allows
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# support for recursive entries to `tractor.breakpoint()`
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log.warning(f"{actor.uid} already has a debug lock, waiting...")
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await Lock.local_pdb_complete.wait()
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await trio.sleep(0.1)
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# mark local actor as "in debug mode" to avoid recurrent
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# entries/requests to the root process
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Lock.local_task_in_debug = task_name
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# this **must** be awaited by the caller and is done using the
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# root nursery so that the debugger can continue to run without
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# being restricted by the scope of a new task nursery.
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# TODO: if we want to debug a trio.Cancelled triggered exception
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# we have to figure out how to avoid having the service nursery
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# cancel on this task start? I *think* this works below:
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# ```python
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# actor._service_n.cancel_scope.shield = shield
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# ```
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# but not entirely sure if that's a sane way to implement it?
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try:
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with trio.CancelScope(shield=True):
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await actor._service_n.start(
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wait_for_parent_stdin_hijack,
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actor.uid,
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)
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Lock.repl = pdb
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except RuntimeError:
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Lock.release()
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if actor._cancel_called:
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# service nursery won't be usable and we
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# don't want to lock up the root either way since
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# we're in (the midst of) cancellation.
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return
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raise
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elif is_root_process():
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# we also wait in the root-parent for any child that
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# may have the tty locked prior
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# TODO: wait, what about multiple root tasks acquiring it though?
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if Lock.global_actor_in_debug == actor.uid:
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# re-entrant root process already has it: noop.
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# Recurrence entry case: this task already has the lock and
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# is likely recurrently entering a breakpoint
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if Lock.local_task_in_debug == task_name:
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# noop on recurrent entry case but we want to trigger
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# a checkpoint to allow other actors error-propagate and
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# potetially avoid infinite re-entries in some subactor.
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await trio.lowlevel.checkpoint()
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return
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# XXX: since we need to enter pdb synchronously below,
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# we have to release the lock manually from pdb completion
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# callbacks. Can't think of a nicer way then this atm.
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if Lock._debug_lock.locked():
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log.warning(
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'Root actor attempting to shield-acquire active tty lock'
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f' owned by {Lock.global_actor_in_debug}')
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# if **this** actor is already in debug mode block here
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# waiting for the control to be released - this allows
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# support for recursive entries to `tractor.breakpoint()`
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log.warning(f"{actor.uid} already has a debug lock, waiting...")
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# must shield here to avoid hitting a ``Cancelled`` and
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# a child getting stuck bc we clobbered the tty
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with trio.CancelScope(shield=True):
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await Lock._debug_lock.acquire()
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else:
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# may be cancelled
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await Lock._debug_lock.acquire()
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await Lock.local_pdb_complete.wait()
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await trio.sleep(0.1)
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Lock.global_actor_in_debug = actor.uid
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Lock.local_task_in_debug = task_name
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Lock.repl = pdb
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# mark local actor as "in debug mode" to avoid recurrent
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# entries/requests to the root process
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Lock.local_task_in_debug = task_name
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# this **must** be awaited by the caller and is done using the
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# root nursery so that the debugger can continue to run without
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# being restricted by the scope of a new task nursery.
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# TODO: if we want to debug a trio.Cancelled triggered exception
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# we have to figure out how to avoid having the service nursery
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# cancel on this task start? I *think* this works below:
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# ```python
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# actor._service_n.cancel_scope.shield = shield
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# ```
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# but not entirely sure if that's a sane way to implement it?
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try:
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if debug_func is None:
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# assert release_lock_signal, (
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# 'Must pass `release_lock_signal: trio.Event` if no '
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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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# with trio.CancelScope(shield=True):
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# await release_lock_signal.wait()
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else:
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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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except bdb.BdbQuit:
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with trio.CancelScope(shield=True):
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await actor._service_n.start(
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wait_for_parent_stdin_hijack,
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actor.uid,
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)
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Lock.repl = pdb
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except RuntimeError:
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Lock.release()
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if actor._cancel_called:
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# service nursery won't be usable and we
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# don't want to lock up the root either way since
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# we're in (the midst of) cancellation.
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return
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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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elif is_root_process():
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# we also wait in the root-parent for any child that
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# may have the tty locked prior
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# TODO: wait, what about multiple root tasks acquiring it though?
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if Lock.global_actor_in_debug == actor.uid:
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# re-entrant root process already has it: noop.
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return
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# XXX: since we need to enter pdb synchronously below,
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# we have to release the lock manually from pdb completion
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# callbacks. Can't think of a nicer way then this atm.
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if Lock._debug_lock.locked():
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log.warning(
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'Root actor attempting to shield-acquire active tty lock'
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f' owned by {Lock.global_actor_in_debug}')
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# must shield here to avoid hitting a ``Cancelled`` and
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# a child getting stuck bc we clobbered the tty
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with trio.CancelScope(shield=True):
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await Lock._debug_lock.acquire()
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else:
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# may be cancelled
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await Lock._debug_lock.acquire()
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Lock.global_actor_in_debug = actor.uid
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Lock.local_task_in_debug = task_name
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Lock.repl = pdb
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try:
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if debug_func is None:
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# assert release_lock_signal, (
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# 'Must pass `release_lock_signal: trio.Event` if no '
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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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# with trio.CancelScope(shield=True):
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# await release_lock_signal.wait()
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else:
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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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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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# TODO: allow pausing from sync code.
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