First proto: use `greenback` for sync func breakpointing
This works now for supporting a new `tractor.pause_from_sync()` `tractor`-aware-replacement for `Pdb.set_trace()` from sync functions which are also scheduled from our runtime. Uses `greenback` to do all the magic of scheduling the bg `tractor._debug._pause()` task and engaging the normal TTY locking machinery triggered by `await tractor.breakpoint()` Further this starts some public API renaming, making a switch to `tractor.pause()` from `.breakpoint()` which IMO much better expresses the semantics of the runtime intervention required to suffice multi-process "breakpointing"; it also is an alternate name for the same in computer science more generally: https://en.wikipedia.org/wiki/Breakpoint It also avoids using the same name as the `breakpoint()` built-in which is important since there **is alot more going on** when you call our equivalent API. Deats of that: - add deprecation warning for `tractor.breakpoint()` - add `tractor.pause()` and a shorthand, easier-to-type, alias `.pp()` for "pause-point" B) - add `pause_from_sync()` as the new `breakpoint()`-from-sync-function hack which does all the `greenback` stuff for the user. Still TODO: - figure out where in the runtime and when to call `greenback.ensure_portal()`. - fix the frame selection issue where `trio._core._ki._ki_protection_decorator:wrapper` seems to be always shown on REPL start as the selected frame..asyncio_debugger_support
Tyler Goodlet
parent
ee87cf0e29
commit
fc56971a2d
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@ -48,6 +48,9 @@ from ._exceptions import (
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)
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from ._debug import (
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breakpoint,
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pause,
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pp,
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pause_from_sync,
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post_mortem,
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)
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from . import msg
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@ -61,12 +64,12 @@ from ._runtime import Actor
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__all__ = [
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'Actor',
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'BaseExceptionGroup',
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'Channel',
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'Context',
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'ContextCancelled',
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'ModuleNotExposed',
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'MsgStream',
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'BaseExceptionGroup',
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'Portal',
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'RemoteActorError',
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'breakpoint',
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@ -79,7 +82,10 @@ __all__ = [
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'open_actor_cluster',
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'open_nursery',
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'open_root_actor',
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'pause',
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'post_mortem',
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'pp',
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'pause_from_sync'
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'query_actor',
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'run_daemon',
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'stream',
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@ -374,7 +374,7 @@ async def wait_for_parent_stdin_hijack(
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This function is used by any sub-actor to acquire mutex access to
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the ``pdb`` REPL and thus the root's TTY for interactive debugging
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(see below inside ``_breakpoint()``). It can be used to ensure that
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(see below inside ``_pause()``). It can be used to ensure that
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an intermediate nursery-owning actor does not clobber its children
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if they are in debug (see below inside
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``maybe_wait_for_debugger()``).
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@ -440,17 +440,29 @@ def mk_mpdb() -> tuple[MultiActorPdb, Callable]:
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return pdb, Lock.unshield_sigint
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async def _breakpoint(
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async def _pause(
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debug_func,
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debug_func: Callable | None = None,
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release_lock_signal: trio.Event | None = None,
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# TODO:
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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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Breakpoint entry for engaging debugger instance sync-interaction,
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from async code, executing in actor runtime (task).
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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__ = True
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@ -559,6 +571,17 @@ async def _breakpoint(
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Lock.repl = pdb
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try:
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# breakpoint()
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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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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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@ -708,8 +731,8 @@ def shield_sigint_handler(
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# elif debug_mode():
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else: # XXX: shouldn't ever get here?
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print("WTFWTFWTF")
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raise KeyboardInterrupt
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raise RuntimeError("WTFWTFWTF")
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# raise KeyboardInterrupt("WTFWTFWTF")
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# NOTE: currently (at least on ``fancycompleter`` 0.9.2)
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# it looks to be that the last command that was run (eg. ll)
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@ -737,21 +760,18 @@ def shield_sigint_handler(
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# https://github.com/goodboy/tractor/issues/130#issuecomment-663752040
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# https://github.com/prompt-toolkit/python-prompt-toolkit/blob/c2c6af8a0308f9e5d7c0e28cb8a02963fe0ce07a/prompt_toolkit/patch_stdout.py
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# XXX LEGACY: lol, see ``pdbpp`` issue:
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# https://github.com/pdbpp/pdbpp/issues/496
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def _set_trace(
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actor: tractor.Actor | None = None,
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pdb: MultiActorPdb | None = None,
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):
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__tracebackhide__ = True
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actor = actor or tractor.current_actor()
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actor: tractor.Actor = actor or tractor.current_actor()
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# start 2 levels up in user code
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frame: Optional[FrameType] = sys._getframe()
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frame: FrameType | None = sys._getframe()
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if frame:
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frame = frame.f_back # type: ignore
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frame: FrameType = frame.f_back # type: ignore
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if (
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frame
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@ -773,10 +793,66 @@ def _set_trace(
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pdb.set_trace(frame=frame)
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breakpoint = partial(
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_breakpoint,
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# TODO: allow pausing from sync code, normally by remapping
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# python's builtin breakpoint() hook to this runtime aware version.
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def pause_from_sync() -> None:
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import greenback
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actor: tractor.Actor = tractor.current_actor()
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task_can_release_tty_lock = trio.Event()
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# spawn bg task which will lock out the TTY, we poll
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# just below until the release event is reporting that task as
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# waiting.. not the most ideal but works for now ;)
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greenback.await_(
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actor._service_n.start(partial(
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_pause,
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debug_func=None,
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release_lock_signal=task_can_release_tty_lock,
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))
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)
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print("ENTER SYNC PAUSE")
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pdb, undo_sigint = mk_mpdb()
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try:
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print("ENTER SYNC PAUSE")
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# _set_trace(actor=actor)
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# we entered the global ``breakpoint()`` built-in from sync
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# code?
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Lock.local_task_in_debug = 'sync'
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frame: FrameType | None = sys._getframe()
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print(f'FRAME: {str(frame)}')
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frame: FrameType = frame.f_back # type: ignore
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print(f'FRAME: {str(frame)}')
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frame: FrameType = frame.f_back # type: ignore
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print(f'FRAME: {str(frame)}')
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pdb.set_trace(frame=frame)
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# pdb.do_frame(
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# pdb.curindex
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finally:
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task_can_release_tty_lock.set()
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undo_sigint()
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# using the "pause" semantics instead since
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# that better covers actually somewhat "pausing the runtime"
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# for this particular paralell task to do debugging B)
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pause = partial(
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_pause,
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_set_trace,
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)
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pp = pause # short-hand for "pause point"
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async def breakpoint(**kwargs):
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log.warning(
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'`tractor.breakpoint()` is deprecated!\n'
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'Please use `tractor.pause()` instead!\n'
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)
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await pause(**kwargs)
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def _post_mortem(
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@ -801,7 +877,7 @@ def _post_mortem(
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post_mortem = partial(
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_breakpoint,
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_pause,
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_post_mortem,
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)
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@ -95,6 +95,10 @@ async def _invoke(
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treat_as_gen: bool = False
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failed_resp: bool = False
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if _state.debug_mode():
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import greenback
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await greenback.ensure_portal()
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# possibly a traceback (not sure what typing is for this..)
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tb = None
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@ -1862,4 +1866,6 @@ class Arbiter(Actor):
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) -> None:
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uid = (str(uid[0]), str(uid[1]))
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self._registry.pop(uid)
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entry: tuple = self._registry.pop(uid, None)
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if entry is None:
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log.warning(f'Request to de-register {uid} failed?')
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Reference in New Issue