Move all module vars into a `Lock` type
Tyler Goodlet
parent
08cf03cd9e
commit
91f034a136
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@ -967,7 +967,7 @@ class Actor:
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# don't start entire actor runtime
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# cancellation if this actor is in debug
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# mode
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pdb_complete = _debug._local_pdb_complete
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pdb_complete = _debug.Lock.local_pdb_complete
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if pdb_complete:
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await pdb_complete.wait()
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@ -1413,7 +1413,7 @@ class Actor:
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# kill any debugger request task to avoid deadlock
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# with the root actor in this tree
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dbcs = _debug._debugger_request_cs
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dbcs = _debug.Lock._debugger_request_cs
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if dbcs is not None:
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log.cancel("Cancelling active debugger request")
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dbcs.cancel()
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@ -33,6 +33,7 @@ from typing import (
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)
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from types import FrameType
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from msgspec import Struct
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import tractor
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import trio
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from trio_typing import TaskStatus
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@ -60,27 +61,39 @@ log = get_logger(__name__)
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__all__ = ['breakpoint', 'post_mortem']
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# TODO: wrap all these in a static global class: ``DebugLock`` maybe?
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class Lock:
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'''
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Actor global debug lock state.
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Mostly to avoid a lot of ``global`` declarations for now XD.
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'''
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# placeholder for function to set a ``trio.Event`` on debugger exit
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_pdb_release_hook: Optional[Callable] = None
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pdb_release_hook: Optional[Callable] = None
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# actor-wide variable pointing to current task name using debugger
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_local_task_in_debug: Optional[str] = None
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local_task_in_debug: Optional[str] = None
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# actor tree-wide actor uid that supposedly has the tty lock
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_global_actor_in_debug: Optional[Tuple[str, str]] = None
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global_actor_in_debug: Optional[Tuple[str, str]] = None
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local_pdb_complete: Optional[trio.Event] = None
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no_remote_has_tty: Optional[trio.Event] = None
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# lock in root actor preventing multi-access to local tty
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_debug_lock: trio.StrictFIFOLock = trio.StrictFIFOLock()
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_local_pdb_complete: Optional[trio.Event] = None
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_no_remote_has_tty: Optional[trio.Event] = None
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# XXX: set by the current task waiting on the root tty lock
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# and must be cancelled if this actor is cancelled via message
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# otherwise deadlocks with the parent actor may ensure
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_debugger_request_cs: Optional[trio.CancelScope] = None
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@classmethod
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def maybe_release(cls):
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cls.local_task_in_debug = None
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if cls.pdb_release_hook:
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cls.pdb_release_hook()
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class TractorConfig(pdbpp.DefaultConfig):
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"""Custom ``pdbpp`` goodness.
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@ -108,13 +121,13 @@ class MultiActorPdb(pdbpp.Pdb):
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try:
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super().set_continue()
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finally:
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maybe_release()
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Lock.maybe_release()
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def set_quit(self):
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try:
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super().set_quit()
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finally:
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maybe_release()
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Lock.maybe_release()
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# TODO: will be needed whenever we get to true remote debugging.
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@ -153,14 +166,6 @@ class MultiActorPdb(pdbpp.Pdb):
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# log.info("Closing stdin hijack")
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# break
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# TODO: make this method on a global lock type!
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def maybe_release():
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global _local_task_in_debug, _pdb_release_hook
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_local_task_in_debug = None
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if _pdb_release_hook:
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_pdb_release_hook()
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@acm
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async def _acquire_debug_lock(
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uid: Tuple[str, str]
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@ -175,8 +180,6 @@ async def _acquire_debug_lock(
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to the ``pdb`` repl.
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'''
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global _debug_lock, _global_actor_in_debug, _no_remote_has_tty
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task_name = trio.lowlevel.current_task().name
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log.runtime(
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@ -190,15 +193,15 @@ async def _acquire_debug_lock(
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f"entering lock checkpoint, remote task: {task_name}:{uid}"
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)
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we_acquired = True
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await _debug_lock.acquire()
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await Lock._debug_lock.acquire()
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if _no_remote_has_tty is None:
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if Lock.no_remote_has_tty is None:
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# mark the tty lock as being in use so that the runtime
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# can try to avoid clobbering any connection from a child
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# that's currently relying on it.
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_no_remote_has_tty = trio.Event()
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Lock.no_remote_has_tty = trio.Event()
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_global_actor_in_debug = uid
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Lock.global_actor_in_debug = uid
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log.runtime(f"TTY lock acquired, remote task: {task_name}:{uid}")
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# NOTE: critical section: this yield is unshielded!
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@ -211,32 +214,32 @@ async def _acquire_debug_lock(
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# surrounding caller side context should cancel normally
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# relaying back to the caller.
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yield _debug_lock
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yield Lock._debug_lock
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finally:
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# if _global_actor_in_debug == uid:
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# if Lock.global_actor_in_debug == uid:
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if (
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we_acquired
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and _debug_lock.locked()
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and Lock._debug_lock.locked()
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):
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_debug_lock.release()
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Lock._debug_lock.release()
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# IFF there are no more requesting tasks queued up fire, the
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# "tty-unlocked" event thereby alerting any monitors of the lock that
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# we are now back in the "tty unlocked" state. This is basically
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# and edge triggered signal around an empty queue of sub-actor
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# tasks that may have tried to acquire the lock.
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stats = _debug_lock.statistics()
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stats = Lock._debug_lock.statistics()
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if (
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not stats.owner
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):
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log.runtime(f"No more tasks waiting on tty lock! says {uid}")
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if _no_remote_has_tty is not None:
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_no_remote_has_tty.set()
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_no_remote_has_tty = None
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if Lock.no_remote_has_tty is not None:
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Lock.no_remote_has_tty.set()
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Lock.no_remote_has_tty = None
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_global_actor_in_debug = None
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Lock.global_actor_in_debug = None
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log.runtime(
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f"TTY lock released, remote task: {task_name}:{uid}"
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@ -348,10 +351,8 @@ async def wait_for_parent_stdin_hijack(
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debug (see below inside ``maybe_wait_for_debugger()``).
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'''
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global _debugger_request_cs
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with trio.CancelScope(shield=True) as cs:
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_debugger_request_cs = cs
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Lock._debugger_request_cs = cs
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try:
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async with get_root() as portal:
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@ -371,9 +372,9 @@ async def wait_for_parent_stdin_hijack(
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# unblock local caller
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try:
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assert _local_pdb_complete
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assert Lock.local_pdb_complete
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task_status.started(cs)
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await _local_pdb_complete.wait()
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await Lock.local_pdb_complete.wait()
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finally:
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# TODO: shielding currently can cause hangs...
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@ -390,8 +391,7 @@ async def wait_for_parent_stdin_hijack(
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finally:
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log.pdb(f"Exiting debugger for actor {actor_uid}")
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global _local_task_in_debug
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_local_task_in_debug = None
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Lock.local_task_in_debug = None
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log.pdb(f"Child {actor_uid} released parent stdio lock")
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@ -440,9 +440,6 @@ async def _breakpoint(
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actor = tractor.current_actor()
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task_name = trio.lowlevel.current_task().name
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global _local_pdb_complete, _pdb_release_hook
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global _local_task_in_debug, _global_actor_in_debug
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# TODO: is it possible to debug a trio.Cancelled except block?
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# right now it seems like we can kinda do with by shielding
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# around ``tractor.breakpoint()`` but not if we move the shielded
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@ -450,14 +447,14 @@ async def _breakpoint(
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# with trio.CancelScope(shield=shield):
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# await trio.lowlevel.checkpoint()
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if not _local_pdb_complete or _local_pdb_complete.is_set():
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_local_pdb_complete = trio.Event()
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if not Lock.local_pdb_complete or Lock.local_pdb_complete.is_set():
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Lock.local_pdb_complete = trio.Event()
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# TODO: need a more robust check for the "root" actor
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if actor._parent_chan and not is_root_process():
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if _local_task_in_debug:
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if _local_task_in_debug == task_name:
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if Lock.local_task_in_debug:
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if Lock.local_task_in_debug == task_name:
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# this task already has the lock and is
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# likely recurrently entering a breakpoint
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return
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@ -467,18 +464,18 @@ async def _breakpoint(
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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 _local_pdb_complete.wait()
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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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_local_task_in_debug = task_name
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Lock.local_task_in_debug = task_name
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def child_release():
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try:
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# sometimes the ``trio`` might already be termianated in
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# which case this call will raise.
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_local_pdb_complete.set()
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Lock.local_pdb_complete.set()
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finally:
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# restore original sigint handler
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undo_sigint()
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@ -486,7 +483,8 @@ async def _breakpoint(
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# _local_task_in_debug = None
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# assign unlock callback for debugger teardown hooks
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_pdb_release_hook = child_release
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Lock.pdb_release_hook = child_release
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# _pdb_release_hook = child_release
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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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@ -503,66 +501,63 @@ async def _breakpoint(
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actor.uid,
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)
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except RuntimeError:
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_pdb_release_hook()
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Lock.pdb_release_hook()
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# _pdb_release_hook()
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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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global _debug_lock
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# TODO: wait, what about multiple root tasks acquiring it though?
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# root process (us) already has it; ignore
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if _global_actor_in_debug == actor.uid:
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if Lock.global_actor_in_debug == actor.uid:
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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 _debug_lock.locked():
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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 {_global_actor_in_debug}')
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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 _debug_lock.acquire()
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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 _debug_lock.acquire()
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await Lock._debug_lock.acquire()
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_global_actor_in_debug = actor.uid
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_local_task_in_debug = task_name
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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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# the lock must be released on pdb completion
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def root_release():
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global _local_pdb_complete, _debug_lock
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global _global_actor_in_debug, _local_task_in_debug
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try:
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_debug_lock.release()
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Lock._debug_lock.release()
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except RuntimeError:
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# uhhh makes no sense but been seeing the non-owner
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# release error even though this is definitely the task
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# that locked?
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owner = _debug_lock.statistics().owner
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owner = Lock._debug_lock.statistics().owner
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if owner:
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raise
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_global_actor_in_debug = None
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_local_task_in_debug = None
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Lock.global_actor_in_debug = None
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Lock.local_task_in_debug = None
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try:
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# sometimes the ``trio`` might already be termianated in
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# which case this call will raise.
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_local_pdb_complete.set()
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Lock.local_pdb_complete.set()
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finally:
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# restore original sigint handler
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undo_sigint()
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_pdb_release_hook = root_release
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# _pdb_release_hook = root_release
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Lock.pdb_release_hook = root_release
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try:
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# block here one (at the appropriate frame *up*) where
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@ -571,7 +566,7 @@ async def _breakpoint(
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debug_func(actor, pdb)
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except bdb.BdbQuit:
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maybe_release()
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Lock.maybe_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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@ -607,8 +602,7 @@ def shield_sigint(
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'''
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__tracebackhide__ = True
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global _local_task_in_debug, _global_actor_in_debug
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uid_in_debug = _global_actor_in_debug
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uid_in_debug = Lock.global_actor_in_debug
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actor = tractor.current_actor()
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@ -681,7 +675,7 @@ def shield_sigint(
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)
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return do_cancel()
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task = _local_task_in_debug
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task = Lock.local_task_in_debug
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if task:
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log.pdb(
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f"Ignoring SIGINT while task in debug mode: `{task}`"
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@ -754,8 +748,7 @@ def _set_trace(
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pdb, undo_sigint = mk_mpdb()
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# we entered the global ``breakpoint()`` built-in from sync code?
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global _local_task_in_debug, _pdb_release_hook
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_local_task_in_debug = 'sync'
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Lock.local_task_in_debug = 'sync'
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pdb.set_trace(frame=frame)
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@ -830,7 +823,7 @@ async def _maybe_enter_pm(err):
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):
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log.debug("Actor crashed, entering debug mode")
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await post_mortem()
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maybe_release()
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Lock.maybe_release()
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return True
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else:
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@ -875,8 +868,6 @@ async def maybe_wait_for_debugger(
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if (
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is_root_process()
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):
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global _no_remote_has_tty, _global_actor_in_debug, _wait_all_tasks_lock
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# If we error in the root but the debugger is
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# engaged we don't want to prematurely kill (and
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# thus clobber access to) the local tty since it
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@ -888,8 +879,8 @@ async def maybe_wait_for_debugger(
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for _ in range(poll_steps):
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if _global_actor_in_debug:
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sub_in_debug = tuple(_global_actor_in_debug)
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if Lock.global_actor_in_debug:
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sub_in_debug = tuple(Lock.global_actor_in_debug)
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# alive = tractor.current_actor().child_alive(sub_in_debug)
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# if not alive:
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# break
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@ -905,7 +896,7 @@ async def maybe_wait_for_debugger(
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# XXX: doesn't seem to work
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# await trio.testing.wait_all_tasks_blocked(cushion=0)
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debug_complete = _no_remote_has_tty
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debug_complete = Lock.no_remote_has_tty
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if (
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(debug_complete and
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not debug_complete.is_set())
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