forked from goodboy/tractor
Use context for remote debugger locking
A context is the natural fit (vs. a receive stream) for locking the root proc's tty usage via it's `.started()` sync point. Simplify the `_breakpoin()` routine to be a simple async func instead of all this "returning a coroutine" stuff from before we decided that `tractor.breakpoint()` must be async. Use `runtime` level for locking logging making it easier to trace.wip_fix_asyncio_gen_streaming
Tyler Goodlet
parent
01bef653c2
commit
420cd8de13
|
|
@ -7,7 +7,6 @@ from functools import partial
|
|||
from contextlib import asynccontextmanager
|
||||
from typing import Awaitable, Tuple, Optional, Callable, AsyncIterator
|
||||
|
||||
from async_generator import aclosing
|
||||
import tractor
|
||||
import trio
|
||||
|
||||
|
|
@ -38,7 +37,9 @@ _pdb_release_hook: Optional[Callable] = None
|
|||
_in_debug = False
|
||||
|
||||
# lock in root actor preventing multi-access to local tty
|
||||
_debug_lock = trio.StrictFIFOLock()
|
||||
_debug_lock: trio.StrictFIFOLock = trio.StrictFIFOLock()
|
||||
_debug_lock._uid = None
|
||||
_pdb_complete: trio.Event = None
|
||||
|
||||
# XXX: set by the current task waiting on the root tty lock
|
||||
# and must be cancelled if this actor is cancelled via message
|
||||
|
|
@ -119,18 +120,21 @@ async def _acquire_debug_lock(uid: Tuple[str, str]) -> AsyncIterator[None]:
|
|||
"""Acquire a actor local FIFO lock meant to mutex entry to a local
|
||||
debugger entry point to avoid tty clobbering by multiple processes.
|
||||
"""
|
||||
task_name = trio.lowlevel.current_task().name
|
||||
try:
|
||||
log.debug(
|
||||
f"Attempting to acquire TTY lock, remote task: {task_name}:{uid}")
|
||||
await _debug_lock.acquire()
|
||||
global _debug_lock
|
||||
|
||||
log.debug(f"TTY lock acquired, remote task: {task_name}:{uid}")
|
||||
task_name = trio.lowlevel.current_task().name
|
||||
|
||||
log.runtime(
|
||||
f"Attempting to acquire TTY lock, remote task: {task_name}:{uid}")
|
||||
|
||||
async with _debug_lock:
|
||||
|
||||
_debug_lock._uid = uid
|
||||
log.runtime(f"TTY lock acquired, remote task: {task_name}:{uid}")
|
||||
yield
|
||||
|
||||
finally:
|
||||
_debug_lock.release()
|
||||
log.debug(f"TTY lock released, remote task: {task_name}:{uid}")
|
||||
_debug_lock._uid = None
|
||||
log.runtime(f"TTY lock released, remote task: {task_name}:{uid}")
|
||||
|
||||
|
||||
# @contextmanager
|
||||
|
|
@ -144,118 +148,159 @@ async def _acquire_debug_lock(uid: Tuple[str, str]) -> AsyncIterator[None]:
|
|||
# signal.signal(signal.SIGINT, prior_handler)
|
||||
|
||||
|
||||
@tractor.context
|
||||
async def _hijack_stdin_relay_to_child(
|
||||
|
||||
ctx: tractor.context,
|
||||
subactor_uid: Tuple[str, str]
|
||||
|
||||
) -> AsyncIterator[str]:
|
||||
|
||||
global _pdb_complete
|
||||
|
||||
task_name = trio.lowlevel.current_task().name
|
||||
|
||||
# TODO: when we get to true remote debugging
|
||||
# this will deliver stdin data
|
||||
log.warning(f"Actor {subactor_uid} is WAITING on stdin hijack lock")
|
||||
# this will deliver stdin data?
|
||||
|
||||
log.debug(
|
||||
"Attempting to acquire TTY lock, "
|
||||
f"remote task: {task_name}:{subactor_uid}"
|
||||
)
|
||||
|
||||
log.runtime(f"Actor {subactor_uid} is WAITING on stdin hijack lock")
|
||||
|
||||
async with _acquire_debug_lock(subactor_uid):
|
||||
log.warning(f"Actor {subactor_uid} ACQUIRED stdin hijack lock")
|
||||
|
||||
# with _disable_sigint():
|
||||
with trio.CancelScope(shield=True):
|
||||
|
||||
# indicate to child that we've locked stdio
|
||||
yield 'Locked'
|
||||
# indicate to child that we've locked stdio
|
||||
await ctx.started('Locked')
|
||||
log.runtime(f"Actor {subactor_uid} ACQUIRED stdin hijack lock")
|
||||
|
||||
# wait for cancellation of stream by child
|
||||
# indicating debugger is dis-engaged
|
||||
await trio.sleep_forever()
|
||||
# wait for unlock pdb by child
|
||||
async with ctx.open_stream() as stream:
|
||||
assert await stream.receive() == 'Unlock'
|
||||
|
||||
log.runtime(
|
||||
f"TTY lock released, remote task: {task_name}:{subactor_uid}")
|
||||
|
||||
log.debug(f"Actor {subactor_uid} RELEASED stdin hijack lock")
|
||||
|
||||
|
||||
# XXX: We only make this sync in case someone wants to
|
||||
# overload the ``breakpoint()`` built-in.
|
||||
def _breakpoint(debug_func) -> Awaitable[None]:
|
||||
async def _breakpoint(debug_func) -> Awaitable[None]:
|
||||
"""``tractor`` breakpoint entry for engaging pdb machinery
|
||||
in subactors.
|
||||
"""
|
||||
actor = tractor.current_actor()
|
||||
do_unlock = trio.Event()
|
||||
task_name = trio.lowlevel.current_task().name
|
||||
|
||||
global _pdb_complete
|
||||
global _pdb_release_hook
|
||||
global _in_debug
|
||||
|
||||
async def wait_for_parent_stdin_hijack(
|
||||
task_status=trio.TASK_STATUS_IGNORED
|
||||
):
|
||||
global _debugger_request_cs
|
||||
|
||||
with trio.CancelScope() as cs:
|
||||
_debugger_request_cs = cs
|
||||
|
||||
try:
|
||||
async with get_root() as portal:
|
||||
async with portal.open_stream_from(
|
||||
tractor._debug._hijack_stdin_relay_to_child,
|
||||
subactor_uid=actor.uid,
|
||||
) as stream:
|
||||
|
||||
# block until first yield above
|
||||
async for val in stream:
|
||||
# this syncs to child's ``Context.started()`` call.
|
||||
async with portal.open_context(
|
||||
|
||||
assert val == 'Locked'
|
||||
task_status.started()
|
||||
tractor._debug._hijack_stdin_relay_to_child,
|
||||
subactor_uid=actor.uid,
|
||||
|
||||
# with trio.CancelScope(shield=True):
|
||||
await do_unlock.wait()
|
||||
) as (ctx, val):
|
||||
|
||||
assert val == 'Locked'
|
||||
|
||||
async with ctx.open_stream() as stream:
|
||||
|
||||
# unblock local caller
|
||||
task_status.started()
|
||||
|
||||
await _pdb_complete.wait()
|
||||
await stream.send('Unlock')
|
||||
|
||||
# trigger cancellation of remote stream
|
||||
break
|
||||
finally:
|
||||
log.debug(f"Exiting debugger for actor {actor}")
|
||||
global _in_debug
|
||||
_in_debug = False
|
||||
log.debug(f"Child {actor} released parent stdio lock")
|
||||
|
||||
async def _bp():
|
||||
"""Async breakpoint which schedules a parent stdio lock, and once complete
|
||||
enters the ``pdbpp`` debugging console.
|
||||
"""
|
||||
task_name = trio.lowlevel.current_task().name
|
||||
if not _pdb_complete or _pdb_complete.is_set():
|
||||
_pdb_complete = trio.Event()
|
||||
|
||||
global _in_debug
|
||||
|
||||
# TODO: need a more robust check for the "root" actor
|
||||
if actor._parent_chan and not is_root_process():
|
||||
if _in_debug:
|
||||
if _in_debug == task_name:
|
||||
# this task already has the lock and is
|
||||
# likely recurrently entering a breakpoint
|
||||
return
|
||||
|
||||
# if **this** actor is already in debug mode block here
|
||||
# waiting for the control to be released - this allows
|
||||
# support for recursive entries to `tractor.breakpoint()`
|
||||
log.warning(
|
||||
f"Actor {actor.uid} already has a debug lock, waiting...")
|
||||
await do_unlock.wait()
|
||||
await trio.sleep(0.1)
|
||||
|
||||
# assign unlock callback for debugger teardown hooks
|
||||
global _pdb_release_hook
|
||||
_pdb_release_hook = do_unlock.set
|
||||
|
||||
# mark local actor as "in debug mode" to avoid recurrent
|
||||
# entries/requests to the root process
|
||||
_in_debug = task_name
|
||||
|
||||
# this **must** be awaited by the caller and is done using the
|
||||
# root nursery so that the debugger can continue to run without
|
||||
# being restricted by the scope of a new task nursery.
|
||||
await actor._service_n.start(wait_for_parent_stdin_hijack)
|
||||
|
||||
elif is_root_process():
|
||||
# we also wait in the root-parent for any child that
|
||||
# may have the tty locked prior
|
||||
if _debug_lock.locked(): # root process already has it; ignore
|
||||
# TODO: need a more robust check for the "root" actor
|
||||
if actor._parent_chan and not is_root_process():
|
||||
if _in_debug:
|
||||
if _in_debug == task_name:
|
||||
# this task already has the lock and is
|
||||
# likely recurrently entering a breakpoint
|
||||
return
|
||||
await _debug_lock.acquire()
|
||||
_pdb_release_hook = _debug_lock.release
|
||||
|
||||
# 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)
|
||||
# if **this** actor is already in debug mode block here
|
||||
# waiting for the control to be released - this allows
|
||||
# support for recursive entries to `tractor.breakpoint()`
|
||||
log.warning(
|
||||
f"Actor {actor.uid} already has a debug lock, waiting...")
|
||||
await _pdb_complete.wait()
|
||||
await trio.sleep(0.1)
|
||||
|
||||
# user code **must** await this!
|
||||
return _bp()
|
||||
# mark local actor as "in debug mode" to avoid recurrent
|
||||
# entries/requests to the root process
|
||||
_in_debug = task_name
|
||||
|
||||
# assign unlock callback for debugger teardown hooks
|
||||
_pdb_release_hook = _pdb_complete.set
|
||||
|
||||
# this **must** be awaited by the caller and is done using the
|
||||
# root nursery so that the debugger can continue to run without
|
||||
# being restricted by the scope of a new task nursery.
|
||||
await actor._service_n.start(wait_for_parent_stdin_hijack)
|
||||
|
||||
elif is_root_process():
|
||||
|
||||
# we also wait in the root-parent for any child that
|
||||
# may have the tty locked prior
|
||||
global _debug_lock
|
||||
|
||||
# TODO: wait, what about multiple root tasks acquiring
|
||||
# it though.. shrug?
|
||||
# root process (us) already has it; ignore
|
||||
if _debug_lock._uid == actor.uid:
|
||||
return
|
||||
|
||||
# XXX: since we need to enter pdb synchronously below,
|
||||
# we have to release the lock manually from pdb completion
|
||||
# callbacks. Can't think of a nicer way then this atm.
|
||||
await _debug_lock.acquire()
|
||||
|
||||
_debug_lock._uid = actor.uid
|
||||
|
||||
# the lock must be released on pdb completion
|
||||
def teardown():
|
||||
global _pdb_complete
|
||||
global _debug_lock
|
||||
|
||||
_debug_lock.release()
|
||||
_debug_lock._uid = None
|
||||
_pdb_complete.set()
|
||||
|
||||
_pdb_release_hook = teardown
|
||||
|
||||
# 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)
|
||||
|
||||
|
||||
def _mk_pdb():
|
||||
|
|
|
|||
Loading…
Reference in New Issue