forked from goodboy/tractor
Move `Portal.open_context()` impl to `._context`
Finally, since normally you need the content from `._context.Context` and surroundings in order to effectively grok `Portal.open_context()` anyways, might as well move the impl to the ctx module as `open_context_from_portal()` and just bind it on the `Portal` class def. Associated/required tweaks: - avoid circ import on `.devx` by only import `.maybe_wait_for_debugger()` when debug mode is set. - drop `async_generator` usage, not sure why this hadn't already been changed to `contextlib`? - use `@acm` alias throughout `._portal`modden_spawn_from_client_req
Tyler Goodlet
parent
da913ef2bb
commit
58cc57a422
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@ -43,7 +43,6 @@ import warnings
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import trio
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from .msg import NamespacePath
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from ._exceptions import (
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ContextCancelled,
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InternalError,
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@ -51,11 +50,16 @@ from ._exceptions import (
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StreamOverrun,
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pack_error,
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unpack_error,
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_raise_from_no_key_in_msg,
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)
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from .log import get_logger
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from .msg import NamespacePath
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from ._ipc import Channel
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from ._streaming import MsgStream
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from ._state import current_actor
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from ._state import (
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current_actor,
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debug_mode,
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)
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if TYPE_CHECKING:
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from ._portal import Portal
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@ -1021,6 +1025,8 @@ class Context:
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assert self._scope
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self._scope.cancel()
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# TODO? should we move this to `._streaming` much like we
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# moved `Portal.open_context()`'s def to this mod?
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@acm
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async def open_stream(
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self,
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@ -1848,6 +1854,541 @@ class Context:
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return False
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@acm
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async def open_context_from_portal(
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portal: Portal,
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func: Callable,
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allow_overruns: bool = False,
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# TODO: if we set this the wrapping `@acm` body will
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# still be shown (awkwardly) on pdb REPL entry. Ideally
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# we can similarly annotate that frame to NOT show?
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hide_tb: bool = True,
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# proxied to RPC
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**kwargs,
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) -> AsyncGenerator[tuple[Context, Any], None]:
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'''
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Open an inter-actor "task context"; a remote task is
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scheduled and cancel-scope-state-linked to a `trio.run()` across
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memory boundaries in another actor's runtime.
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This is an `@acm` API bound as `Portal.open_context()` which
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allows for deterministic setup and teardown of a remotely
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scheduled task in another remote actor. Once opened, the 2 now
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"linked" tasks run completely in parallel in each actor's
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runtime with their enclosing `trio.CancelScope`s kept in
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a synced state wherein if either side errors or cancels an
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equivalent error is relayed to the other side via an SC-compat
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IPC protocol.
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The yielded `tuple` is a pair delivering a `tractor.Context`
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and any first value "sent" by the "callee" task via a call
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to `Context.started(<value: Any>)`; this side of the
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context does not unblock until the "callee" task calls
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`.started()` in similar style to `trio.Nursery.start()`.
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When the "callee" (side that is "called"/started by a call
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to *this* method) returns, the caller side (this) unblocks
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and any final value delivered from the other end can be
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retrieved using the `Contex.result()` api.
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The yielded ``Context`` instance further allows for opening
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bidirectional streams, explicit cancellation and
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structurred-concurrency-synchronized final result-msg
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collection. See ``tractor.Context`` for more details.
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'''
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__tracebackhide__: bool = hide_tb
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# conduct target func method structural checks
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if not inspect.iscoroutinefunction(func) and (
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getattr(func, '_tractor_contex_function', False)
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):
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raise TypeError(
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f'{func} must be an async generator function!')
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# TODO: i think from here onward should probably
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# just be factored into an `@acm` inside a new
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# a new `_context.py` mod.
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nsf = NamespacePath.from_ref(func)
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# XXX NOTE XXX: currenly we do NOT allow opening a contex
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# with "self" since the local feeder mem-chan processing
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# is not built for it.
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if portal.channel.uid == portal.actor.uid:
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raise RuntimeError(
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'** !! Invalid Operation !! **\n'
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'Can not open an IPC ctx with the local actor!\n'
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f'|_{portal.actor}\n'
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)
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ctx: Context = await portal.actor.start_remote_task(
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portal.channel,
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nsf=nsf,
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kwargs=kwargs,
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# NOTE: it's imporant to expose this since you might
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# get the case where the parent who opened the context does
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# not open a stream until after some slow startup/init
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# period, in which case when the first msg is read from
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# the feeder mem chan, say when first calling
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# `Context.open_stream(allow_overruns=True)`, the overrun condition will be
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# raised before any ignoring of overflow msgs can take
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# place..
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allow_overruns=allow_overruns,
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)
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assert ctx._remote_func_type == 'context'
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msg: dict = await ctx._recv_chan.receive()
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try:
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# the "first" value here is delivered by the callee's
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# ``Context.started()`` call.
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first: Any = msg['started']
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ctx._started_called: bool = True
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except KeyError as src_error:
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_raise_from_no_key_in_msg(
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ctx=ctx,
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msg=msg,
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src_err=src_error,
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log=log,
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expect_key='started',
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)
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ctx._portal: Portal = portal
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uid: tuple = portal.channel.uid
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cid: str = ctx.cid
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# placeholder for any exception raised in the runtime
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# or by user tasks which cause this context's closure.
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scope_err: BaseException|None = None
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ctxc_from_callee: ContextCancelled|None = None
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try:
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async with trio.open_nursery() as nurse:
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# NOTE: used to start overrun queuing tasks
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ctx._scope_nursery: trio.Nursery = nurse
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ctx._scope: trio.CancelScope = nurse.cancel_scope
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# deliver context instance and .started() msg value
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# in enter tuple.
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yield ctx, first
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# ??TODO??: do we still want to consider this or is
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# the `else:` block handling via a `.result()`
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# call below enough??
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# -[ ] pretty sure `.result()` internals do the
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# same as our ctxc handler below so it ended up
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# being same (repeated?) behaviour, but ideally we
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# wouldn't have that duplication either by somehow
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# factoring the `.result()` handler impl in a way
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# that we can re-use it around the `yield` ^ here
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# or vice versa?
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#
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# NOTE: between the caller exiting and arriving
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# here the far end may have sent a ctxc-msg or
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# other error, so check for it here immediately
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# and maybe raise so as to engage the ctxc
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# handling block below!
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#
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# if re := ctx._remote_error:
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# maybe_ctxc: ContextCancelled|None = ctx._maybe_raise_remote_err(
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# re,
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# # TODO: do we want this to always raise?
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# # - means that on self-ctxc, if/when the
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# # block is exited before the msg arrives
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# # but then the msg during __exit__
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# # calling we may not activate the
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# # ctxc-handler block below? should we
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# # be?
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# # - if there's a remote error that arrives
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# # after the child has exited, we won't
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# # handle until the `finally:` block
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# # where `.result()` is always called,
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# # again in which case we handle it
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# # differently then in the handler block
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# # that would normally engage from THIS
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# # block?
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# raise_ctxc_from_self_call=True,
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# )
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# ctxc_from_callee = maybe_ctxc
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# when in allow_overruns mode there may be
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# lingering overflow sender tasks remaining?
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if nurse.child_tasks:
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# XXX: ensure we are in overrun state
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# with ``._allow_overruns=True`` bc otherwise
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# there should be no tasks in this nursery!
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if (
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not ctx._allow_overruns
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or len(nurse.child_tasks) > 1
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):
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raise InternalError(
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'Context has sub-tasks but is '
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'not in `allow_overruns=True` mode!?'
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)
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# ensure we cancel all overflow sender
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# tasks started in the nursery when
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# `._allow_overruns == True`.
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#
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# NOTE: this means `._scope.cancelled_caught`
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# will prolly be set! not sure if that's
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# non-ideal or not ???
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ctx._scope.cancel()
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# XXX NOTE XXX: maybe shield against
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# self-context-cancellation (which raises a local
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# `ContextCancelled`) when requested (via
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# `Context.cancel()`) by the same task (tree) which entered
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# THIS `.open_context()`.
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#
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# NOTE: There are 2 operating cases for a "graceful cancel"
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# of a `Context`. In both cases any `ContextCancelled`
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# raised in this scope-block came from a transport msg
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# relayed from some remote-actor-task which our runtime set
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# as to `Context._remote_error`
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#
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# the CASES:
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#
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# - if that context IS THE SAME ONE that called
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# `Context.cancel()`, we want to absorb the error
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# silently and let this `.open_context()` block to exit
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# without raising, ideally eventually receiving the ctxc
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# ack msg thus resulting in `ctx.cancel_acked == True`.
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#
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# - if it is from some OTHER context (we did NOT call
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# `.cancel()`), we want to re-RAISE IT whilst also
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# setting our own ctx's "reason for cancel" to be that
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# other context's cancellation condition; we set our
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# `.canceller: tuple[str, str]` to be same value as
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# caught here in a `ContextCancelled.canceller`.
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#
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# AGAIN to restate the above, there are 2 cases:
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#
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# 1-some other context opened in this `.open_context()`
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# block cancelled due to a self or peer cancellation
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# request in which case we DO let the error bubble to the
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# opener.
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#
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# 2-THIS "caller" task somewhere invoked `Context.cancel()`
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# and received a `ContextCanclled` from the "callee"
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# task, in which case we mask the `ContextCancelled` from
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# bubbling to this "caller" (much like how `trio.Nursery`
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# swallows any `trio.Cancelled` bubbled by a call to
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# `Nursery.cancel_scope.cancel()`)
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except ContextCancelled as ctxc:
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scope_err = ctxc
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ctx._local_error: BaseException = scope_err
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ctxc_from_callee = ctxc
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# XXX TODO XXX: FIX THIS debug_mode BUGGGG!!!
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# using this code and then resuming the REPL will
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# cause a SIGINT-ignoring HANG!
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# -> prolly due to a stale debug lock entry..
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# -[ ] USE `.stackscope` to demonstrate that (possibly
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# documenting it as a definittive example of
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# debugging the tractor-runtime itself using it's
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# own `.devx.` tooling!
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#
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# await _debug.pause()
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# CASE 2: context was cancelled by local task calling
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# `.cancel()`, we don't raise and the exit block should
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# exit silently.
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if (
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ctx._cancel_called
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and
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ctxc is ctx._remote_error
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and
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ctxc.canceller == portal.actor.uid
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):
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log.cancel(
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f'Context (cid=[{ctx.cid[-6:]}..] cancelled gracefully with:\n'
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f'{ctxc}'
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)
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# CASE 1: this context was never cancelled via a local
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# task (tree) having called `Context.cancel()`, raise
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# the error since it was caused by someone else
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# -> probably a remote peer!
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else:
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raise
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# the above `._scope` can be cancelled due to:
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# 1. an explicit self cancel via `Context.cancel()` or
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# `Actor.cancel()`,
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# 2. any "callee"-side remote error, possibly also a cancellation
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# request by some peer,
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# 3. any "caller" (aka THIS scope's) local error raised in the above `yield`
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except (
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# CASE 3: standard local error in this caller/yieldee
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Exception,
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# CASES 1 & 2: can manifest as a `ctx._scope_nursery`
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# exception-group of,
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#
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# 1.-`trio.Cancelled`s, since
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# `._scope.cancel()` will have been called
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# (transitively by the runtime calling
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# `._deliver_msg()`) and any `ContextCancelled`
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# eventually absorbed and thus absorbed/supressed in
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# any `Context._maybe_raise_remote_err()` call.
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#
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# 2.-`BaseExceptionGroup[ContextCancelled | RemoteActorError]`
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# from any error delivered from the "callee" side
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# AND a group-exc is only raised if there was > 1
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# tasks started *here* in the "caller" / opener
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# block. If any one of those tasks calls
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# `.result()` or `MsgStream.receive()`
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# `._maybe_raise_remote_err()` will be transitively
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# called and the remote error raised causing all
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# tasks to be cancelled.
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# NOTE: ^ this case always can happen if any
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# overrun handler tasks were spawned!
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BaseExceptionGroup,
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trio.Cancelled, # NOTE: NOT from inside the ctx._scope
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KeyboardInterrupt,
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) as caller_err:
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scope_err = caller_err
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ctx._local_error: BaseException = scope_err
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# XXX: ALWAYS request the context to CANCEL ON any ERROR.
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# NOTE: `Context.cancel()` is conversely NEVER CALLED in
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# the `ContextCancelled` "self cancellation absorbed" case
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# handled in the block above ^^^ !!
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# await _debug.pause()
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log.cancel(
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'Context terminated due to\n\n'
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f'.outcome => {ctx.repr_outcome()}\n'
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)
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if debug_mode():
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# async with _debug.acquire_debug_lock(portal.actor.uid):
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# pass
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# TODO: factor ^ into below for non-root cases?
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#
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from .devx import maybe_wait_for_debugger
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was_acquired: bool = await maybe_wait_for_debugger(
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header_msg=(
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'Delaying `ctx.cancel()` until debug lock '
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'acquired..\n'
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),
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)
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if was_acquired:
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log.pdb(
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'Acquired debug lock! '
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'Calling `ctx.cancel()`!\n'
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)
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# we don't need to cancel the callee if it already
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# told us it's cancelled ;p
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if ctxc_from_callee is None:
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try:
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await ctx.cancel()
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except (
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trio.BrokenResourceError,
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trio.ClosedResourceError,
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):
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log.warning(
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'IPC connection for context is broken?\n'
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f'task:{cid}\n'
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f'actor:{uid}'
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)
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raise # duh
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# no local scope error, the "clean exit with a result" case.
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else:
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if ctx.chan.connected():
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log.runtime(
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'Waiting on final context result for\n'
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f'peer: {uid}\n'
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f'|_{ctx._task}\n'
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)
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# XXX NOTE XXX: the below call to
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# `Context.result()` will ALWAYS raise
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# a `ContextCancelled` (via an embedded call to
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# `Context._maybe_raise_remote_err()`) IFF
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# a `Context._remote_error` was set by the runtime
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# via a call to
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# `Context._maybe_cancel_and_set_remote_error()`.
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# As per `Context._deliver_msg()`, that error IS
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# ALWAYS SET any time "callee" side fails and causes "caller
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# side" cancellation via a `ContextCancelled` here.
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try:
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result_or_err: Exception|Any = await ctx.result()
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except BaseException as berr:
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# on normal teardown, if we get some error
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# raised in `Context.result()` we still want to
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# save that error on the ctx's state to
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# determine things like `.cancelled_caught` for
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# cases where there was remote cancellation but
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# this task didn't know until final teardown
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# / value collection.
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scope_err = berr
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ctx._local_error: BaseException = scope_err
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raise
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# yes! this worx Bp
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# from .devx import _debug
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# await _debug.pause()
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# an exception type boxed in a `RemoteActorError`
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# is returned (meaning it was obvi not raised)
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# that we want to log-report on.
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msgdata: str|None = getattr(
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result_or_err,
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'msgdata',
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None
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)
|
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match (msgdata, result_or_err):
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case (
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{'tb_str': tbstr},
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ContextCancelled(),
|
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):
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log.cancel(tbstr)
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|
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case (
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{'tb_str': tbstr},
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RemoteActorError(),
|
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):
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log.exception(
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'Context remotely errored!\n'
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f'<= peer: {uid}\n'
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f' |_ {nsf}()\n\n'
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|
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f'{tbstr}'
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)
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case (None, _):
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log.runtime(
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'Context returned final result from callee task:\n'
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f'<= peer: {uid}\n'
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f' |_ {nsf}()\n\n'
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f'`{result_or_err}`\n'
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)
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finally:
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# XXX: (MEGA IMPORTANT) if this is a root opened process we
|
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# wait for any immediate child in debug before popping the
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# context from the runtime msg loop otherwise inside
|
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# ``Actor._push_result()`` the msg will be discarded and in
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# the case where that msg is global debugger unlock (via
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||||
# a "stop" msg for a stream), this can result in a deadlock
|
||||
# where the root is waiting on the lock to clear but the
|
||||
# child has already cleared it and clobbered IPC.
|
||||
if debug_mode():
|
||||
from .devx import maybe_wait_for_debugger
|
||||
await maybe_wait_for_debugger()
|
||||
|
||||
# though it should be impossible for any tasks
|
||||
# operating *in* this scope to have survived
|
||||
# we tear down the runtime feeder chan last
|
||||
# to avoid premature stream clobbers.
|
||||
if (
|
||||
(rxchan := ctx._recv_chan)
|
||||
|
||||
# maybe TODO: yes i know the below check is
|
||||
# touching `trio` memchan internals..BUT, there are
|
||||
# only a couple ways to avoid a `trio.Cancelled`
|
||||
# bubbling from the `.aclose()` call below:
|
||||
#
|
||||
# - catch and mask it via the cancel-scope-shielded call
|
||||
# as we are rn (manual and frowned upon) OR,
|
||||
# - specially handle the case where `scope_err` is
|
||||
# one of {`BaseExceptionGroup`, `trio.Cancelled`}
|
||||
# and then presume that the `.aclose()` call will
|
||||
# raise a `trio.Cancelled` and just don't call it
|
||||
# in those cases..
|
||||
#
|
||||
# that latter approach is more logic, LOC, and more
|
||||
# convoluted so for now stick with the first
|
||||
# psuedo-hack-workaround where we just try to avoid
|
||||
# the shielded call as much as we can detect from
|
||||
# the memchan's `._closed` state..
|
||||
#
|
||||
# XXX MOTIVATION XXX-> we generally want to raise
|
||||
# any underlying actor-runtime/internals error that
|
||||
# surfaces from a bug in tractor itself so it can
|
||||
# be easily detected/fixed AND, we also want to
|
||||
# minimize noisy runtime tracebacks (normally due
|
||||
# to the cross-actor linked task scope machinery
|
||||
# teardown) displayed to user-code and instead only
|
||||
# displaying `ContextCancelled` traces where the
|
||||
# cause of crash/exit IS due to something in
|
||||
# user/app code on either end of the context.
|
||||
and not rxchan._closed
|
||||
):
|
||||
# XXX NOTE XXX: and again as per above, we mask any
|
||||
# `trio.Cancelled` raised here so as to NOT mask
|
||||
# out any exception group or legit (remote) ctx
|
||||
# error that sourced from the remote task or its
|
||||
# runtime.
|
||||
#
|
||||
# NOTE: further, this should be the only place the
|
||||
# underlying feeder channel is
|
||||
# once-and-only-CLOSED!
|
||||
with trio.CancelScope(shield=True):
|
||||
await ctx._recv_chan.aclose()
|
||||
|
||||
# XXX: we always raise remote errors locally and
|
||||
# generally speaking mask runtime-machinery related
|
||||
# multi-`trio.Cancelled`s. As such, any `scope_error`
|
||||
# which was the underlying cause of this context's exit
|
||||
# should be stored as the `Context._local_error` and
|
||||
# used in determining `Context.cancelled_caught: bool`.
|
||||
if scope_err is not None:
|
||||
# sanity, tho can remove?
|
||||
assert ctx._local_error is scope_err
|
||||
# ctx._local_error: BaseException = scope_err
|
||||
# etype: Type[BaseException] = type(scope_err)
|
||||
|
||||
# CASE 2
|
||||
if (
|
||||
ctx._cancel_called
|
||||
and ctx.cancel_acked
|
||||
):
|
||||
log.cancel(
|
||||
'Context cancelled by caller task\n'
|
||||
f'|_{ctx._task}\n\n'
|
||||
|
||||
f'{repr(scope_err)}\n'
|
||||
)
|
||||
|
||||
# TODO: should we add a `._cancel_req_received`
|
||||
# flag to determine if the callee manually called
|
||||
# `ctx.cancel()`?
|
||||
# -[ ] going to need a cid check no?
|
||||
|
||||
# CASE 1
|
||||
else:
|
||||
outcome_str: str = ctx.repr_outcome(
|
||||
show_error_fields=True,
|
||||
# type_only=True,
|
||||
)
|
||||
log.cancel(
|
||||
f'Context terminated due to local scope error:\n\n'
|
||||
f'{ctx.chan.uid} => {outcome_str}\n'
|
||||
)
|
||||
|
||||
# FINALLY, remove the context from runtime tracking and
|
||||
# exit!
|
||||
log.runtime(
|
||||
'Removing IPC ctx opened with peer\n'
|
||||
f'{uid}\n'
|
||||
f'|_{ctx}\n'
|
||||
)
|
||||
portal.actor._contexts.pop(
|
||||
(uid, cid),
|
||||
None,
|
||||
)
|
||||
|
||||
|
||||
def mk_context(
|
||||
chan: Channel,
|
||||
cid: str,
|
||||
|
|
|
|||
|
|
@ -24,6 +24,7 @@ OS processes, possibly on different (hardware) hosts.
|
|||
|
||||
'''
|
||||
from __future__ import annotations
|
||||
from contextlib import asynccontextmanager as acm
|
||||
import importlib
|
||||
import inspect
|
||||
from typing import (
|
||||
|
|
@ -37,30 +38,21 @@ from dataclasses import dataclass
|
|||
import warnings
|
||||
|
||||
import trio
|
||||
from async_generator import asynccontextmanager
|
||||
|
||||
from .trionics import maybe_open_nursery
|
||||
from .devx import (
|
||||
# _debug,
|
||||
maybe_wait_for_debugger,
|
||||
)
|
||||
from ._state import (
|
||||
current_actor,
|
||||
debug_mode,
|
||||
)
|
||||
from ._ipc import Channel
|
||||
from .log import get_logger
|
||||
from .msg import NamespacePath
|
||||
from ._exceptions import (
|
||||
InternalError,
|
||||
_raise_from_no_key_in_msg,
|
||||
unpack_error,
|
||||
NoResult,
|
||||
ContextCancelled,
|
||||
RemoteActorError,
|
||||
)
|
||||
from ._context import (
|
||||
Context,
|
||||
open_context_from_portal,
|
||||
)
|
||||
from ._streaming import (
|
||||
MsgStream,
|
||||
|
|
@ -392,7 +384,7 @@ class Portal:
|
|||
self.channel,
|
||||
)
|
||||
|
||||
@asynccontextmanager
|
||||
@acm
|
||||
async def open_stream_from(
|
||||
self,
|
||||
async_gen_func: Callable, # typing: ignore
|
||||
|
|
@ -449,541 +441,12 @@ class Portal:
|
|||
# await recv_chan.aclose()
|
||||
self._streams.remove(rchan)
|
||||
|
||||
# TODO: move this impl to `._context` mod and
|
||||
# instead just bind it here as a method so that the logic
|
||||
# for ctx stuff stays all in one place (instead of frickin
|
||||
# having to open this file in tandem every gd time!!! XD)
|
||||
#
|
||||
@asynccontextmanager
|
||||
async def open_context(
|
||||
|
||||
self,
|
||||
func: Callable,
|
||||
|
||||
allow_overruns: bool = False,
|
||||
|
||||
# TODO: if we set this the wrapping `@acm` body will
|
||||
# still be shown (awkwardly) on pdb REPL entry. Ideally
|
||||
# we can similarly annotate that frame to NOT show?
|
||||
hide_tb: bool = True,
|
||||
|
||||
# proxied to RPC
|
||||
**kwargs,
|
||||
|
||||
) -> AsyncGenerator[tuple[Context, Any], None]:
|
||||
'''
|
||||
Open an inter-actor "task context"; a remote task is
|
||||
scheduled and cancel-scope-state-linked to a `trio.run()` across
|
||||
memory boundaries in another actor's runtime.
|
||||
|
||||
This is an `@acm` API which allows for deterministic setup
|
||||
and teardown of a remotely scheduled task in another remote
|
||||
actor. Once opened, the 2 now "linked" tasks run completely
|
||||
in parallel in each actor's runtime with their enclosing
|
||||
`trio.CancelScope`s kept in a synced state wherein if
|
||||
either side errors or cancels an equivalent error is
|
||||
relayed to the other side via an SC-compat IPC protocol.
|
||||
|
||||
The yielded `tuple` is a pair delivering a `tractor.Context`
|
||||
and any first value "sent" by the "callee" task via a call
|
||||
to `Context.started(<value: Any>)`; this side of the
|
||||
context does not unblock until the "callee" task calls
|
||||
`.started()` in similar style to `trio.Nursery.start()`.
|
||||
When the "callee" (side that is "called"/started by a call
|
||||
to *this* method) returns, the caller side (this) unblocks
|
||||
and any final value delivered from the other end can be
|
||||
retrieved using the `Contex.result()` api.
|
||||
|
||||
The yielded ``Context`` instance further allows for opening
|
||||
bidirectional streams, explicit cancellation and
|
||||
structurred-concurrency-synchronized final result-msg
|
||||
collection. See ``tractor.Context`` for more details.
|
||||
|
||||
'''
|
||||
__tracebackhide__: bool = hide_tb
|
||||
|
||||
# conduct target func method structural checks
|
||||
if not inspect.iscoroutinefunction(func) and (
|
||||
getattr(func, '_tractor_contex_function', False)
|
||||
):
|
||||
raise TypeError(
|
||||
f'{func} must be an async generator function!')
|
||||
|
||||
# TODO: i think from here onward should probably
|
||||
# just be factored into an `@acm` inside a new
|
||||
# a new `_context.py` mod.
|
||||
nsf = NamespacePath.from_ref(func)
|
||||
|
||||
# XXX NOTE XXX: currenly we do NOT allow opening a contex
|
||||
# with "self" since the local feeder mem-chan processing
|
||||
# is not built for it.
|
||||
if self.channel.uid == self.actor.uid:
|
||||
raise RuntimeError(
|
||||
'** !! Invalid Operation !! **\n'
|
||||
'Can not open an IPC ctx with the local actor!\n'
|
||||
f'|_{self.actor}\n'
|
||||
)
|
||||
|
||||
ctx: Context = await self.actor.start_remote_task(
|
||||
self.channel,
|
||||
nsf=nsf,
|
||||
kwargs=kwargs,
|
||||
|
||||
# NOTE: it's imporant to expose this since you might
|
||||
# get the case where the parent who opened the context does
|
||||
# not open a stream until after some slow startup/init
|
||||
# period, in which case when the first msg is read from
|
||||
# the feeder mem chan, say when first calling
|
||||
# `Context.open_stream(allow_overruns=True)`, the overrun condition will be
|
||||
# raised before any ignoring of overflow msgs can take
|
||||
# place..
|
||||
allow_overruns=allow_overruns,
|
||||
)
|
||||
|
||||
assert ctx._remote_func_type == 'context'
|
||||
msg: dict = await ctx._recv_chan.receive()
|
||||
|
||||
try:
|
||||
# the "first" value here is delivered by the callee's
|
||||
# ``Context.started()`` call.
|
||||
first: Any = msg['started']
|
||||
ctx._started_called: bool = True
|
||||
|
||||
except KeyError as src_error:
|
||||
_raise_from_no_key_in_msg(
|
||||
ctx=ctx,
|
||||
msg=msg,
|
||||
src_err=src_error,
|
||||
log=log,
|
||||
expect_key='started',
|
||||
)
|
||||
|
||||
ctx._portal: Portal = self
|
||||
uid: tuple = self.channel.uid
|
||||
cid: str = ctx.cid
|
||||
|
||||
# placeholder for any exception raised in the runtime
|
||||
# or by user tasks which cause this context's closure.
|
||||
scope_err: BaseException|None = None
|
||||
ctxc_from_callee: ContextCancelled|None = None
|
||||
try:
|
||||
async with trio.open_nursery() as nurse:
|
||||
|
||||
# NOTE: used to start overrun queuing tasks
|
||||
ctx._scope_nursery: trio.Nursery = nurse
|
||||
ctx._scope: trio.CancelScope = nurse.cancel_scope
|
||||
|
||||
# deliver context instance and .started() msg value
|
||||
# in enter tuple.
|
||||
yield ctx, first
|
||||
|
||||
# ??TODO??: do we still want to consider this or is
|
||||
# the `else:` block handling via a `.result()`
|
||||
# call below enough??
|
||||
# -[ ] pretty sure `.result()` internals do the
|
||||
# same as our ctxc handler below so it ended up
|
||||
# being same (repeated?) behaviour, but ideally we
|
||||
# wouldn't have that duplication either by somehow
|
||||
# factoring the `.result()` handler impl in a way
|
||||
# that we can re-use it around the `yield` ^ here
|
||||
# or vice versa?
|
||||
#
|
||||
# NOTE: between the caller exiting and arriving
|
||||
# here the far end may have sent a ctxc-msg or
|
||||
# other error, so check for it here immediately
|
||||
# and maybe raise so as to engage the ctxc
|
||||
# handling block below!
|
||||
#
|
||||
# if re := ctx._remote_error:
|
||||
# maybe_ctxc: ContextCancelled|None = ctx._maybe_raise_remote_err(
|
||||
# re,
|
||||
# # TODO: do we want this to always raise?
|
||||
# # - means that on self-ctxc, if/when the
|
||||
# # block is exited before the msg arrives
|
||||
# # but then the msg during __exit__
|
||||
# # calling we may not activate the
|
||||
# # ctxc-handler block below? should we
|
||||
# # be?
|
||||
# # - if there's a remote error that arrives
|
||||
# # after the child has exited, we won't
|
||||
# # handle until the `finally:` block
|
||||
# # where `.result()` is always called,
|
||||
# # again in which case we handle it
|
||||
# # differently then in the handler block
|
||||
# # that would normally engage from THIS
|
||||
# # block?
|
||||
# raise_ctxc_from_self_call=True,
|
||||
# )
|
||||
# ctxc_from_callee = maybe_ctxc
|
||||
|
||||
# when in allow_overruns mode there may be
|
||||
# lingering overflow sender tasks remaining?
|
||||
if nurse.child_tasks:
|
||||
# XXX: ensure we are in overrun state
|
||||
# with ``._allow_overruns=True`` bc otherwise
|
||||
# there should be no tasks in this nursery!
|
||||
if (
|
||||
not ctx._allow_overruns
|
||||
or len(nurse.child_tasks) > 1
|
||||
):
|
||||
raise InternalError(
|
||||
'Context has sub-tasks but is '
|
||||
'not in `allow_overruns=True` mode!?'
|
||||
)
|
||||
|
||||
# ensure we cancel all overflow sender
|
||||
# tasks started in the nursery when
|
||||
# `._allow_overruns == True`.
|
||||
#
|
||||
# NOTE: this means `._scope.cancelled_caught`
|
||||
# will prolly be set! not sure if that's
|
||||
# non-ideal or not ???
|
||||
ctx._scope.cancel()
|
||||
|
||||
# XXX NOTE XXX: maybe shield against
|
||||
# self-context-cancellation (which raises a local
|
||||
# `ContextCancelled`) when requested (via
|
||||
# `Context.cancel()`) by the same task (tree) which entered
|
||||
# THIS `.open_context()`.
|
||||
#
|
||||
# NOTE: There are 2 operating cases for a "graceful cancel"
|
||||
# of a `Context`. In both cases any `ContextCancelled`
|
||||
# raised in this scope-block came from a transport msg
|
||||
# relayed from some remote-actor-task which our runtime set
|
||||
# as to `Context._remote_error`
|
||||
#
|
||||
# the CASES:
|
||||
#
|
||||
# - if that context IS THE SAME ONE that called
|
||||
# `Context.cancel()`, we want to absorb the error
|
||||
# silently and let this `.open_context()` block to exit
|
||||
# without raising, ideally eventually receiving the ctxc
|
||||
# ack msg thus resulting in `ctx.cancel_acked == True`.
|
||||
#
|
||||
# - if it is from some OTHER context (we did NOT call
|
||||
# `.cancel()`), we want to re-RAISE IT whilst also
|
||||
# setting our own ctx's "reason for cancel" to be that
|
||||
# other context's cancellation condition; we set our
|
||||
# `.canceller: tuple[str, str]` to be same value as
|
||||
# caught here in a `ContextCancelled.canceller`.
|
||||
#
|
||||
# AGAIN to restate the above, there are 2 cases:
|
||||
#
|
||||
# 1-some other context opened in this `.open_context()`
|
||||
# block cancelled due to a self or peer cancellation
|
||||
# request in which case we DO let the error bubble to the
|
||||
# opener.
|
||||
#
|
||||
# 2-THIS "caller" task somewhere invoked `Context.cancel()`
|
||||
# and received a `ContextCanclled` from the "callee"
|
||||
# task, in which case we mask the `ContextCancelled` from
|
||||
# bubbling to this "caller" (much like how `trio.Nursery`
|
||||
# swallows any `trio.Cancelled` bubbled by a call to
|
||||
# `Nursery.cancel_scope.cancel()`)
|
||||
except ContextCancelled as ctxc:
|
||||
scope_err = ctxc
|
||||
ctx._local_error: BaseException = scope_err
|
||||
ctxc_from_callee = ctxc
|
||||
|
||||
# XXX TODO XXX: FIX THIS debug_mode BUGGGG!!!
|
||||
# using this code and then resuming the REPL will
|
||||
# cause a SIGINT-ignoring HANG!
|
||||
# -> prolly due to a stale debug lock entry..
|
||||
# -[ ] USE `.stackscope` to demonstrate that (possibly
|
||||
# documenting it as a definittive example of
|
||||
# debugging the tractor-runtime itself using it's
|
||||
# own `.devx.` tooling!
|
||||
#
|
||||
# await _debug.pause()
|
||||
|
||||
# CASE 2: context was cancelled by local task calling
|
||||
# `.cancel()`, we don't raise and the exit block should
|
||||
# exit silently.
|
||||
if (
|
||||
ctx._cancel_called
|
||||
and
|
||||
ctxc is ctx._remote_error
|
||||
and
|
||||
ctxc.canceller == self.actor.uid
|
||||
):
|
||||
log.cancel(
|
||||
f'Context (cid=[{ctx.cid[-6:]}..] cancelled gracefully with:\n'
|
||||
f'{ctxc}'
|
||||
)
|
||||
# CASE 1: this context was never cancelled via a local
|
||||
# task (tree) having called `Context.cancel()`, raise
|
||||
# the error since it was caused by someone else
|
||||
# -> probably a remote peer!
|
||||
else:
|
||||
raise
|
||||
|
||||
# the above `._scope` can be cancelled due to:
|
||||
# 1. an explicit self cancel via `Context.cancel()` or
|
||||
# `Actor.cancel()`,
|
||||
# 2. any "callee"-side remote error, possibly also a cancellation
|
||||
# request by some peer,
|
||||
# 3. any "caller" (aka THIS scope's) local error raised in the above `yield`
|
||||
except (
|
||||
# CASE 3: standard local error in this caller/yieldee
|
||||
Exception,
|
||||
|
||||
# CASES 1 & 2: can manifest as a `ctx._scope_nursery`
|
||||
# exception-group of,
|
||||
#
|
||||
# 1.-`trio.Cancelled`s, since
|
||||
# `._scope.cancel()` will have been called
|
||||
# (transitively by the runtime calling
|
||||
# `._deliver_msg()`) and any `ContextCancelled`
|
||||
# eventually absorbed and thus absorbed/supressed in
|
||||
# any `Context._maybe_raise_remote_err()` call.
|
||||
#
|
||||
# 2.-`BaseExceptionGroup[ContextCancelled | RemoteActorError]`
|
||||
# from any error delivered from the "callee" side
|
||||
# AND a group-exc is only raised if there was > 1
|
||||
# tasks started *here* in the "caller" / opener
|
||||
# block. If any one of those tasks calls
|
||||
# `.result()` or `MsgStream.receive()`
|
||||
# `._maybe_raise_remote_err()` will be transitively
|
||||
# called and the remote error raised causing all
|
||||
# tasks to be cancelled.
|
||||
# NOTE: ^ this case always can happen if any
|
||||
# overrun handler tasks were spawned!
|
||||
BaseExceptionGroup,
|
||||
|
||||
trio.Cancelled, # NOTE: NOT from inside the ctx._scope
|
||||
KeyboardInterrupt,
|
||||
|
||||
) as caller_err:
|
||||
scope_err = caller_err
|
||||
ctx._local_error: BaseException = scope_err
|
||||
|
||||
# XXX: ALWAYS request the context to CANCEL ON any ERROR.
|
||||
# NOTE: `Context.cancel()` is conversely NEVER CALLED in
|
||||
# the `ContextCancelled` "self cancellation absorbed" case
|
||||
# handled in the block above ^^^ !!
|
||||
# await _debug.pause()
|
||||
log.cancel(
|
||||
'Context terminated due to\n\n'
|
||||
f'.outcome => {ctx.repr_outcome()}\n'
|
||||
)
|
||||
|
||||
if debug_mode():
|
||||
# async with _debug.acquire_debug_lock(self.actor.uid):
|
||||
# pass
|
||||
# TODO: factor ^ into below for non-root cases?
|
||||
was_acquired: bool = await maybe_wait_for_debugger(
|
||||
header_msg=(
|
||||
'Delaying `ctx.cancel()` until debug lock '
|
||||
'acquired..\n'
|
||||
),
|
||||
)
|
||||
if was_acquired:
|
||||
log.pdb(
|
||||
'Acquired debug lock! '
|
||||
'Calling `ctx.cancel()`!\n'
|
||||
)
|
||||
|
||||
|
||||
# we don't need to cancel the callee if it already
|
||||
# told us it's cancelled ;p
|
||||
if ctxc_from_callee is None:
|
||||
try:
|
||||
await ctx.cancel()
|
||||
except (
|
||||
trio.BrokenResourceError,
|
||||
trio.ClosedResourceError,
|
||||
):
|
||||
log.warning(
|
||||
'IPC connection for context is broken?\n'
|
||||
f'task:{cid}\n'
|
||||
f'actor:{uid}'
|
||||
)
|
||||
|
||||
raise # duh
|
||||
|
||||
# no local scope error, the "clean exit with a result" case.
|
||||
else:
|
||||
if ctx.chan.connected():
|
||||
log.runtime(
|
||||
'Waiting on final context result for\n'
|
||||
f'peer: {uid}\n'
|
||||
f'|_{ctx._task}\n'
|
||||
)
|
||||
# XXX NOTE XXX: the below call to
|
||||
# `Context.result()` will ALWAYS raise
|
||||
# a `ContextCancelled` (via an embedded call to
|
||||
# `Context._maybe_raise_remote_err()`) IFF
|
||||
# a `Context._remote_error` was set by the runtime
|
||||
# via a call to
|
||||
# `Context._maybe_cancel_and_set_remote_error()`.
|
||||
# As per `Context._deliver_msg()`, that error IS
|
||||
# ALWAYS SET any time "callee" side fails and causes "caller
|
||||
# side" cancellation via a `ContextCancelled` here.
|
||||
try:
|
||||
result_or_err: Exception|Any = await ctx.result()
|
||||
except BaseException as berr:
|
||||
# on normal teardown, if we get some error
|
||||
# raised in `Context.result()` we still want to
|
||||
# save that error on the ctx's state to
|
||||
# determine things like `.cancelled_caught` for
|
||||
# cases where there was remote cancellation but
|
||||
# this task didn't know until final teardown
|
||||
# / value collection.
|
||||
scope_err = berr
|
||||
ctx._local_error: BaseException = scope_err
|
||||
raise
|
||||
|
||||
# yes! this worx Bp
|
||||
# from .devx import _debug
|
||||
# await _debug.pause()
|
||||
|
||||
# an exception type boxed in a `RemoteActorError`
|
||||
# is returned (meaning it was obvi not raised)
|
||||
# that we want to log-report on.
|
||||
msgdata: str|None = getattr(
|
||||
result_or_err,
|
||||
'msgdata',
|
||||
None
|
||||
)
|
||||
match (msgdata, result_or_err):
|
||||
case (
|
||||
{'tb_str': tbstr},
|
||||
ContextCancelled(),
|
||||
):
|
||||
log.cancel(tbstr)
|
||||
|
||||
case (
|
||||
{'tb_str': tbstr},
|
||||
RemoteActorError(),
|
||||
):
|
||||
log.exception(
|
||||
'Context remotely errored!\n'
|
||||
f'<= peer: {uid}\n'
|
||||
f' |_ {nsf}()\n\n'
|
||||
|
||||
f'{tbstr}'
|
||||
)
|
||||
case (None, _):
|
||||
log.runtime(
|
||||
'Context returned final result from callee task:\n'
|
||||
f'<= peer: {uid}\n'
|
||||
f' |_ {nsf}()\n\n'
|
||||
|
||||
f'`{result_or_err}`\n'
|
||||
)
|
||||
|
||||
finally:
|
||||
# XXX: (MEGA IMPORTANT) if this is a root opened process we
|
||||
# wait for any immediate child in debug before popping the
|
||||
# context from the runtime msg loop otherwise inside
|
||||
# ``Actor._push_result()`` the msg will be discarded and in
|
||||
# the case where that msg is global debugger unlock (via
|
||||
# a "stop" msg for a stream), this can result in a deadlock
|
||||
# where the root is waiting on the lock to clear but the
|
||||
# child has already cleared it and clobbered IPC.
|
||||
await maybe_wait_for_debugger()
|
||||
|
||||
# though it should be impossible for any tasks
|
||||
# operating *in* this scope to have survived
|
||||
# we tear down the runtime feeder chan last
|
||||
# to avoid premature stream clobbers.
|
||||
if (
|
||||
(rxchan := ctx._recv_chan)
|
||||
|
||||
# maybe TODO: yes i know the below check is
|
||||
# touching `trio` memchan internals..BUT, there are
|
||||
# only a couple ways to avoid a `trio.Cancelled`
|
||||
# bubbling from the `.aclose()` call below:
|
||||
#
|
||||
# - catch and mask it via the cancel-scope-shielded call
|
||||
# as we are rn (manual and frowned upon) OR,
|
||||
# - specially handle the case where `scope_err` is
|
||||
# one of {`BaseExceptionGroup`, `trio.Cancelled`}
|
||||
# and then presume that the `.aclose()` call will
|
||||
# raise a `trio.Cancelled` and just don't call it
|
||||
# in those cases..
|
||||
#
|
||||
# that latter approach is more logic, LOC, and more
|
||||
# convoluted so for now stick with the first
|
||||
# psuedo-hack-workaround where we just try to avoid
|
||||
# the shielded call as much as we can detect from
|
||||
# the memchan's `._closed` state..
|
||||
#
|
||||
# XXX MOTIVATION XXX-> we generally want to raise
|
||||
# any underlying actor-runtime/internals error that
|
||||
# surfaces from a bug in tractor itself so it can
|
||||
# be easily detected/fixed AND, we also want to
|
||||
# minimize noisy runtime tracebacks (normally due
|
||||
# to the cross-actor linked task scope machinery
|
||||
# teardown) displayed to user-code and instead only
|
||||
# displaying `ContextCancelled` traces where the
|
||||
# cause of crash/exit IS due to something in
|
||||
# user/app code on either end of the context.
|
||||
and not rxchan._closed
|
||||
):
|
||||
# XXX NOTE XXX: and again as per above, we mask any
|
||||
# `trio.Cancelled` raised here so as to NOT mask
|
||||
# out any exception group or legit (remote) ctx
|
||||
# error that sourced from the remote task or its
|
||||
# runtime.
|
||||
#
|
||||
# NOTE: further, this should be the only place the
|
||||
# underlying feeder channel is
|
||||
# once-and-only-CLOSED!
|
||||
with trio.CancelScope(shield=True):
|
||||
await ctx._recv_chan.aclose()
|
||||
|
||||
# XXX: we always raise remote errors locally and
|
||||
# generally speaking mask runtime-machinery related
|
||||
# multi-`trio.Cancelled`s. As such, any `scope_error`
|
||||
# which was the underlying cause of this context's exit
|
||||
# should be stored as the `Context._local_error` and
|
||||
# used in determining `Context.cancelled_caught: bool`.
|
||||
if scope_err is not None:
|
||||
# sanity, tho can remove?
|
||||
assert ctx._local_error is scope_err
|
||||
# ctx._local_error: BaseException = scope_err
|
||||
# etype: Type[BaseException] = type(scope_err)
|
||||
|
||||
# CASE 2
|
||||
if (
|
||||
ctx._cancel_called
|
||||
and ctx.cancel_acked
|
||||
):
|
||||
log.cancel(
|
||||
'Context cancelled by caller task\n'
|
||||
f'|_{ctx._task}\n\n'
|
||||
|
||||
f'{repr(scope_err)}\n'
|
||||
)
|
||||
|
||||
# TODO: should we add a `._cancel_req_received`
|
||||
# flag to determine if the callee manually called
|
||||
# `ctx.cancel()`?
|
||||
# -[ ] going to need a cid check no?
|
||||
|
||||
# CASE 1
|
||||
else:
|
||||
outcome_str: str = ctx.repr_outcome(
|
||||
show_error_fields=True,
|
||||
# type_only=True,
|
||||
)
|
||||
log.cancel(
|
||||
f'Context terminated due to local scope error:\n\n'
|
||||
f'{ctx.chan.uid} => {outcome_str}\n'
|
||||
)
|
||||
|
||||
# FINALLY, remove the context from runtime tracking and
|
||||
# exit!
|
||||
log.runtime(
|
||||
'Removing IPC ctx opened with peer\n'
|
||||
f'{uid}\n'
|
||||
f'|_{ctx}\n'
|
||||
)
|
||||
self.actor._contexts.pop(
|
||||
(uid, cid),
|
||||
None,
|
||||
)
|
||||
# NOTE: impl is found in `._context`` mod to make
|
||||
# reading/groking the details simpler code-org-wise. This
|
||||
# method does not have to be used over that `@acm` module func
|
||||
# directly, it is for conventience and from the original API
|
||||
# design.
|
||||
open_context = open_context_from_portal
|
||||
|
||||
|
||||
@dataclass
|
||||
|
|
@ -1014,7 +477,7 @@ class LocalPortal:
|
|||
return await func(**kwargs)
|
||||
|
||||
|
||||
@asynccontextmanager
|
||||
@acm
|
||||
async def open_portal(
|
||||
|
||||
channel: Channel,
|
||||
|
|
|
|||
Loading…
Reference in New Issue