In particular ensuring we use `ctx._pld_rx.recv_msg_nowait()` from
`.receive_nowait()` (which is called from `.aclose()`) such that we
ALWAYS (can) set the surrounding `Context._result/._outcome_msg` attrs
on reception of a final `Return`!!
This fixes a final stream-teardown-race-condition-bug where prior we
normally didn't set the `Context._result/._outcome_msg` in such cases.
This is **precisely because** `.receive_nowait()` only returns the
`pld` and when called from `.aclose()` this value is discarded, meaning
so is its boxing `Return` despite consuming it from the underlying
`._rx_chan`..
Longer term this should be solved differently by ensuring such races
cases are handled at a higher scope like inside `Context._deliver_msg()`
or the `Portal.open_context()` enter/exit blocks? Add a detailed warning
note and todos for all this around the special case block!
Such that any `Return` is always capture for each ctx instance and set
in `._deliver_msg()` normally; ensures we can at least introspect for it
when missing (like in a recently discovered stream teardown race bug).
Yes this augments the already existing `._result` which is dedicated for
the `._outcome_msg.pld` in the non-error case; we might want to see if
there's a nicer way to directly proxy ref to that without getting the
pre-pld-decoded `Raw` form with `msgspec`?
Also use the new `ctx._pld_rx.recv_msg()` and drop assigning
`pld_rx._ctx`.
Namely renaming and tweaking the `MsgType` receiving methods,
- `.recv_msg()` from what was `.recv_msg_w_pld()` which both receives
the IPC msg from the underlying `._rx_chan` and then decodes its
payload with `.decode_pld()`; it now also log reports on the different
"stage of SC dialog protocol" msg types via a `match/case`.
- a new `.recv_msg_nowait()` sync equivalent of ^ (*was*
`.recv_pld_nowait()`) who's use was the source of a recently
discovered bug where any final `Return.pld` is being
consumed-n-discarded by by `MsgStream.aclose()` depending on
ctx/stream teardown race conditions..
Also,
- remove all the "instance persistent" ipc-ctx attrs, specifically the
optional `_ipc`, `_ctx` and the `.wraps_ipc()` cm, since none of them
were ever really needed/used; all methods which require
a `Context/MsgStream` are explicitly always passed.
- update a buncha typing namely to use the more generic-styled
`PayloadT` over `Any` and obviously `MsgType[PayloadT]`.
Repairs a bug in `drain_to_final_msg()` where in the `Yield()` case
block we weren't guarding against the `ctx._stream is None` edge case
which should be treated a `continue`-draining (not a `break` or
attr-error!!) situation since the peer task maybe be continuing to send
`Yield` but has not yet sent an outcome msg (one of
`Return/Error/ContextCancelled`) to terminate the loop. Ensure we
explicitly warn about this case as well as `.cancel()` emit on a taskc.
Thanks again to @guille for discovering this!
Also add temporary `.info()`s around rxed `Return` msgs as part of
trying to debug a different bug discovered while updating the
context-semantics test suite (in a prior commit).
Muchas grax to @guilledk for finding the first issue which kicked of
this further scrutiny of the `tractor.Context` and `MsgStream` semantics
test suite with a strange edge case where,
- if the parent opened and immediately closed a stream while the remote
child task started and continued (without terminating) to send msgs
the parent's `open_context().__aexit__()` would **not block** on the
child to complete!
=> this was seemingly due to a bug discovered inside the
`.msg._ops.drain_to_final_msg()` stream handling case logic where we
are NOT checking if `Context._stream` is non-`None`!
As such this,
- extends the `test_caller_closes_ctx_after_callee_opens_stream` (now
renamed, see below) to include cases for all combinations of the child
and parent sending before receiving on the stream as well as all
placements of `Context.cancel()` in the parent before, around and after
the stream open.
- uses the new `expect_ctxc()` for expecting the taskc (`trio.Task`
cancelled)` cases.
- also extends the `test_callee_closes_ctx_after_stream_open` (also
renamed) to include the case where the parent sends a msg before it
receives.
=> this case has unveiled yet-another-bug where somehow the underlying
`MsgStream._rx_chan: trio.ReceiveMemoryChannel` is allowing the
child's `Return[None]` msg be consumed and NOT in a place where it is
correctly set as `Context._result` resulting in the parent hanging
forever inside `._ops.drain_to_final_msg()`..
Alongside,
- start renaming using the new "remote-task-peer-side" semantics
throughout the test module: "caller" -> "parent", "callee" -> "child".
Just like we do from the `.devx._debug.open_crash_handler()`, this
allows checking various attrs on the raised `ContextCancelled` much like
`with pytest.raises() as excinfo:`.
Seems this can happen in particular when we raise a `MessageTypeError`
on the sender side of a `Context`, since there isn't any msg relayed
from the other side (though i'm wondering if MTE should derive from RAE
then considering this case?).
Means `RemoteActorError.boxed_type = None` in such cases instead of
raising an attr-error for the `None.boxed_type_str`.
Namely that `add_hooks: bool` should be the same as on the rent side..
Also, just drop the now unused `iter_maybe_sends`.
This makes the suite entire greeeeen btw, including the new sub-suite
which i hadn't runt before Bo
Namely renaming and massively simplifying it to a new
`test_ext_types_over_ipc` which avoids all the wacky "parent dictates
what sender should be able to send beforehand"..
Instead keep it simple and just always try to send the same small set of
types over the wire with expect-logic to handle each case,
- use the new `dec_hook`/`ext_types` args to `mk_[co]dec()` routines for
pld-spec ipc transport.
- always try to stream a small set of types from the child with logic to
handle the cases expected to error.
Other,
- draft a `test_pld_limiting_usage` to check runtime raising of bad API
usage; haven't run it yet tho.
- move `test_custom_extension_types` to top of mod so that the
`enc/dec_nsp()` hooks can be reffed from test parametrizations.
- comment out (and maybe remove) the old routines for
`iter_maybe_sends`, `test_limit_msgspec`, `chk_pld_type`.
XXX TODO, turns out the 2 failing cases from this suite have exposed an
an actual bug with `MsgTypeError` unpacking where the `ipc_msg=` input
is being set to `None` ?? -> see the comment at the bottom of
`._exceptions._mk_recv_mte()` which seems to describe the likely
culprit?
Since it should only be used from within a `Portal.open_context()`
scope, make sure the caller knows that!
Also don't hide the frame in tb if the immediate function errors..
By using our new `PldRx` design we can,
- pass through the pld-spec & a `dec_hook()` to our `MsgDec` which is
used to configure the underlying `.dec: msgspec.msgpack.Decoder`
- pass through a `enc_hook()` to `mk_codec()` and use it to conf the
equiv `MsgCodec.enc` such that sent msg-plds are converted prior
to transport.
The trick ended up being just to always union the `mk_dec()`
extension-types spec with the normaly with the `msgspec.Raw` pld-spec
such that the `dec_hook()` is only invoked for payload types tagged
by the encoder/sender side B)
A variety of impl tweaks to make it all happen as well as various
cleanups in the `.msg._codec` mod include,
- `mk_dec()` no defaul `spec` arg, better doc string, accept the new
`ext_types` arg, doing the union of that with `msgspec.Raw`.
- proto-ed a now unused `mk_boxed_ext_struct()` which will likely get
removed since it ended up that our `PayloadMsg` structs already cover
the ext-type-hook requirement that the decoder is passed
a `.type=msgspec.Struct` of some sort in order for `.dec_hook` to be
used.
- add a `unpack_spec_types()` util fn for getting the `set[Type]` from
from a `Union[Type]` annotation instance.
- mk the default `mk_codec(pc_pld_spec = Raw,)` since the `PldRx` design
was already passing/overriding it and it doesn't make much sense to
use `Any` anymore for the same reason; it will cause various `Context`
apis to now break.
|_ also accept a `enc_hook()` and `ext_types` which are used to maybe
config the `.msgpack.Encoder`
- generally tweak a bunch of comments-as-docs and todos namely the ones
that are completed after the pld-rx design was implemented.
Also,
- mask the non-functioning `'defstruct'` approach `inside
`.msg.types.mk_msg_spec()` to prep for its removal.
Adjust the test suite (rn called `test_caps_based_msging`),
- add a new suite `test_custom_extension_types` and move and
use the `enc/dec_nsp()` hooks to the mod level for its use.
- prolly planning to drop the `test_limit_msgspec` suite since it's
mostly replaced by the `test_pldrx_limiting` mod's version?
- originally was tweaking a bunch in `test_codec_hooks_mod` but likely
it will get mostly rewritten to be simpler and simply verify that
ext-typed fields can be used over IPC `Context`s between actors (as
originally intended for this sub-suite).
Since it isn't required until the landing of the new service-manager
stuff in #12; was an oversight
from commit `0607a31dddeba032a2cf7d9fe605edd9d7bb4846`.
In the `examples/debugging/restore_builtin_breakpoint.py` i had put the
pattern-comment lines on the line following the `breakpoint()` bc it
seems that's where `pdb` would always "stop" and print the line to
console? So the test would only pass by actually ensuring that in the
`pexpect` capture..
Now on 3.13 it seems that the `pdb` line halting must have been fixed;
it now renders to console the same `breakpoint()` line?
Anyway it works as you'd expect now but **only** on 3.13 so after this
change we might have to adjust the tests to `pytest.xfail()` on earlier
versions.
Like any `bdb.BdbQuit` that might be relayed from a remote context after
a REPl exit with the `quit` cmd. This fixes various issues while
debugging where it may not be clear to the parent task that the child
was terminated with a purposefully unrecoverable error.
Inside a new `.trionics._beg` and exposed from the subpkg ns in
anticipation of the `strict_exception_groups=False` being removed by
`trio` in py 3.15.
Notes,
- mk an embedded single-exc "extractor" using a `BaseExceptionGroup.exceptions` length
check, when 1 return the lone child.
- use the above in a new `@acm`, async bc it's most likely to be composed in an
`async with` tuple-style sequence block, called `collapse_eg()` which
acts a one line "absorber" for when the above mentioned flag is no
logner supported by `trio.open_nursery()`.
All untested atm fwiw.. but soon to be used in our test suite(s) likely!
Including changes like,
- loose eg flagging in various test emedded `trio.open_nursery()`s.
- changes to eg handling (like using `except*`).
- added `debug_mode` integration to tests that needed some REPLin
in order to figure out appropriate updates.
Namely when the subactor fails to lock the root, in which case we
try to be very verbose about how/what failed in logging as well
as ensure we cancel the employed IPC ctx.
Implement the outer `BaseException` handler to handle both styles,
- match on an eg (or the prior std cancel excs) only raising a lone
sub-exc from for former.
- always `as _req_err:` and assign to a new func-global `req_err`
to enable the above matching.
Other,
- raise `DebugStateError` on `status.subactor_uid != actor_uid`.
- fix a `_repl_fail_report` ref error due to making silly assumptions
about the `_repl_fail_msg` global; now copy from global as default.
- various log-fmt and logic expression styling tweaks.
- ignore `trio.Cancelled` by default in `open_crash_handler()`.
Namely inside,
- `ActorNursery.open_portal()` which uses
`.trionics.maybe_open_nursery()` and is now adjusted to
pass-through `**kwargs` for at least this flag.
- inside the `.trionics.gather_contexts()`.
Such that it gets passed through to `.open_root_actor()` in the
`implicit_runtime==True` case - useful for debugging cases where
`.devx._debug` APIs might be used to avoid REPL clobbering in subactors.
Since it'll likely need a bit of detailing to get the test suite running
identically with strict egs (exception groups), i've opted to just flip
the switch on a few core nursery scopes for now until as such a time
i can focus enough to port the matching internals.. Xp
Since it turns out there's a few gotchas moving to python 3.13,
- we need to pin to new(er) `trio` which now flips to strict exception
groups (something to be handled in a follow up patch).
- since we're now using `uv` we should (at least for now) prefer the
system `python` (over astral's distis) since they compile for
`libedit` in terms of what the (new) `readline.backend: str` will read
as; this will break our tab-completion and vi-mode settings in
the `pdbp` REPL without a user configuring a `~/.editrc`
appropriately.
- go back to using latest `pdbp` (not a local dev version) since it
should work fine presuming the previous bullet is addressed.
Lock bumps,
- for now use latest `trio==0.29.0` (which i gotta feeling might have
broken some existing attempts at strict-eg handling i've tried..)
- update to latest `xonsh`, `pdbp` and its dep `tabcompleter`
Other cleaning,
- put back in various deps "comments" from `poetry` content.
- drop the `xonsh-vox` and `xontrib-vox` dev deps; no `vox` support with
`uv` rn anyway..
Such that a `TrioCancelled` is raised in the aio task via
`.set_exception()` to explicitly indicate and allow that task to handle
a taskc request from the parent `trio.Task`.
Namely the `tractor.pause_from_sync()` examples using both bg threads
and `asyncio` which seem to go into bad states where SIGINT is ignored..
Deats,
- add `maybe_expect_timeout()` cm to ensure the EOF hangs get
`.xfail()`ed instead.
- @pytest.mark.ctlcs_bish` `test_pause_from_sync` and don't expect the
greenback prompt msg.
- also mark `test_sync_pause_from_aio_task`.
Seems that on 3.13 it's not showing our script code in the output now?
Gotta get an example for @oremanj to see what's up but really it'd be
nice to just custom format stuff above `trio`'s runtime by def..
Anyway, update the `.devx._stackscope`,
- log formatting to be a little more "sclangy" lookin.
- change the per-actor "delimiter" lines style.
- report the `signal.getsignal(SIGINT)` which i needed in the
`sync_bp.py` with ctl-c causing a hang..
- mask the `_tree_dumped` duplicator log report as well as the "dumped
fine" one.
- add an example `pkill --signal SIGUSR1` cmdline.
Tweak the test to cope with,
- not showing our script lines now.. which i've commented in the
`assert_before()` patts..
- to expect the newly formatted delimiter (ascii) lines to separate the
root vs. hanger sub-actor sections.
That is whenever `trio.EndOfChannel` is raised (presumably from the
`._to_trio.receive()` call inside `LinkedTaskChannel.receive()`) we need
to be extra certain that we let it bubble upward transparently DESPITE
special exc-as-signal handling that is normally suppressed from the aio
side; REPEAT we want to ALWAYS bubble any `trio_err ==
trio.EndOfChannel` in the `finally:` handler of `translate_aio_errors()`
despite `chan._trio_to_raise == AsyncioTaskExited` such that the
caller's iterable machinery will operate as normal when the inter-task
stream is stopped (again, presumably by the aio side task terminating
the inter-task stream).
Main impl deats for this,
- in the EoC handler block ensure we assign both `chan._trio_err` and
the local `trio_err` as well as continue to re-raise.
- add a case to the match block in the `finally:` handler which FOR SURE
re-raises any `type(trio_err) is EndOfChannel`!
Additionally fix a bad bug,
- a ref bug where we were NOT using the
`except BaseException as _trio_err` to assign to `chan._trio_err` (by
accident was missing the leading `_`..)
Unrelated impl tweak,
- move all `maybe_raise_aio_side_err()` content back to inline with its
parent func - makes it easier to use `tractor.pause()` mostly Bp
- go back to trying to use `aio_task.set_exception(aio_taskc)` for now
even though i'm pretty sure we're going to move to a try-fute-first
style helper for this in the future.
Adjust some tests to match/mk-them-green,
- break from `aio_echo_server()` recv loop on
`to_asyncio.TrioTaskExited` much like how you'd expect to (implicitly
with a `for`) with a `trio.EndOfChannel`.
- toss in a masked `value is None` pause point i needed for debugging
inf looping caused by not re-raising EoCs per the main patch
description.
- add a debug-mode sized delay to root-infected test.
Such that any combination of task terminations/exits can be explicitly
handled and "dual side independent" crash cases re-raised in egs.
The main error-or-exit impl changes include,
- use of new per-side "signaling exceptions":
- TrioTaskExited|TrioCancelled for signalling aio.
- AsyncioTaskExited|AsyncioCancelled for signalling trio.
- NOT overloading the `LinkedTaskChannel._trio/aio_err` fields for
err-as-signal relay and instead add a new pair of
`._trio/aio_to_raise` maybe-exc-attrs which allow each side's
task to specify what it would want the other side to raise to signal
its/a termination outcome:
- `._trio_to_raise: AsyncioTaskExited|AsyncioCancelled` to signal,
|_ the aio task having returned while the trio side was still reading
from the `asyncio.Queue` or is just not `.done()`.
|_ the aio task being self or trio-request cancelled where
a `asyncio.CancelledError` is raised and caught but NOT relayed
as is back to trio; instead signal a "more explicit" exc type.
- `._aio_to_raise: TrioTaskExited|TrioCancelled` to signal,
|_ the trio task having returned while the aio side was still reading
from the mem chan and indicating that the trio side might not
care any more about future streamed values (like the
`Stop/EndOfChannel` equivs for ipc `Context`s).
|_ when the trio task canceld we do
a `asyncio.Future.set_exception(TrioTaskExited())` to indicate
to the aio side verbosely that it should cancel due to the trio
parent.
- `_aio/trio_err` are now left to only capturing the **actual**
per-side task excs for introspection / other side's handling logic.
- supporting "graceful exits" depending on API in use from
`translate_aio_errors()` such that if either side exits but the other
side isn't expect to consume the final `return`ed value, we just exit
silently, which required:
- adding a `suppress_graceful_exits: bool` flag.
- adjusting the `maybe_raise_aio_side_err()` logic to use that flag
and suppress only on certain combos of `._trio_to_raise/._trio_err`.
- prefer to raise `._trio_to_raise` when the aio-side is the src and
vice versa.
- filling out pedantic logging for cancellation cases indicating which
side is the cause.
- add a `LinkedTaskChannel._aio_result` modelled after our
`Context._result` a a similar `.wait_for_result()` interface which
allows maybe accessing the aio task's final return value if desired
when using the `open_channel_from()` API.
- rename `cancel_trio()` done handler -> `signal_trio_when_done()`
Also some fairly major test suite updates,
- add a `delay: int` producing fixture which delivers a much larger
timeout whenever `debug_mode` is set so that the REPL can be used
without a surrounding cancel firing.
- add a new `test_aio_exits_early_relays_AsyncioTaskExited` including
a paired `exit_early: bool` flag to `push_from_aio_task()`.
- adjust `test_trio_closes_early_causes_aio_checkpoint_raise` to expect
a `to_asyncio.TrioTaskExited`.
It appears that during the reorg commit
a356233b47 this was intended to be moved
(presumably where i have here) to `test_tooling` but was somehow just
never pasted over XD
Good thing this was caught while going through the remaining TODO
bullets in #2 !!
Also includes fixed relative `.conftest` imports!
Since there's no way to activate `greenback`'s portal in such cases, we
should at least have a test verifying our very loud error about the
inability to support this usage..
The (rare) condition is heavily detailed in new comments in
the `cancel_trio()` callback but, more or less the idea here is to be
extra pedantic in raising an `Exceptiongroup` of errors from each task
(both `asyncio` and `trio`) whenever the 2 tasks raise "independently"
- in the sense that it's not obviously one side's task causing an error
(or cancellation) in the other. In this case we set the error for each
side on the `LinkedTaskChannel` (via new attrs described later).
As a synopsis, most of this work was refined out of supporting
`infected_aio=True` mode in the **root actor** and in particular as part
of getting that to work inside the `modden` daemon which at the time of
writing was still using the `i3ipc` lib and thus `asyncio`.
Impl deats,
- extend the `LinkedTaskChannel` field/API set (and type it),
- `._trio_task: trio.Task` for test/user introspection.
- also "stage" some ideas for a more refined interface,
- `.started()` to deliver the value yielded to the `trio.Task` parent.
|_ also includes some todos for how to implement this design
underneath.
- `._aio_first: Any|None = None` to hold that value ^.
- `.wait_aio_complete()` for syncing to the asyncio task.
- some detailed logging around "asyncio cancelled trio" case.
- Move `AsyncioCancelled` in this module.
Styling changes,
- generally more explicit var naming.
- some todos for getting modern and fancy with typing..
NB, Let it be known this commit msg was written on a friday with the
help of various "mr. white" solns.
Might as well break apart the specific test set since there are some
(minor) subtleties and the orig test mod is already getting pretty big
XD
Includes both the new "independent"-event-loops test as well as the std
usage base case suite.
Such that the suite verifies the wip `maybe_raise_from_masking_exc()`
will raise from a `trio.Cancelled.__context__` since I can't think of
any reason a `Cancelled` should ever be raised in-place of
a non-`Cancelled` XD
Not sure what should be raised instead (or maybe just a `log.warning()`
emitted?) but this starts a draft for refinement at the least. Use the
new `@pytest.mark.parametrize` explicit tuple-of-params form with an
`pytest.param + `.mark.xfail()` for the default behaviour case.
Since i wasted 2 days just to find an example of this inside an `@acm`,
figured I better reproduce for the purposes of maybe implementing
a warning sys (inside our wip proto `open_taskman()`) when a nursery
detects a single `Cancelled` in an eg where the `.__context__` is set to
some non-cancel error (which likely means a cancel-causing source
exception was suppressed by accident).
Left in a buncha commented code using `maybe_open_nursery()` which
i thought might be part of the issue but didn't end up being required;
will likely remove on a follow up refinement.
Along the lines of something like `pytest.raises()` where the handled
exception can be inspected from the `pdbp` REPL using its `.value` field
B)
This is super handy in particular for understanding
`BaseException[Group]`s without manually adding surrounding handler code
to assign the `except[*] Exception as exc_var:` particularly when trying
to understand multi-cancelled eg trees.
Trying to replicate cases where errors are raised in both `trio` and
`asyncio` tasks independently (at least in `.to_asyncio` API terms) with
a new `test_trio_prestarted_task_bubbles` that generates 3 cases inside
a `@acm` calls stack composing a `trio.Nursery` with
a `to_asyncio.open_channel_from()` call where a set of `trio` tasks are
started in a loop using `.start()` with various exc raising sequences,
- the aio task raising *before* the last `trio` task spawns.
- the aio task raising just after the last trio task spawns, but before
it starts.
- after the last trio task `.start()` call returns control to the
parent - but (for now) did not error.
TODO, still more cases to discover as i'm still fighting a `modden` bug
of this sort atm..
Other,
- tweak some other tests to have timeouts since some recent hangs were
found..
- started mucking with py3.13 and thus adjustments for strict egs in
some tests; full patchset to test suite likely coming soon!
Since we can't use it to `Task.set_exception()` (since that task method never
seems to work.. XD) and setting the private/internal always seems to do
the desired raising in the task? I realize it's an internal `asyncio`
runtime field but i'd rather take the risk of it breaking then having to
rely on our own equivalent hack..
Also, it seems like the case where the task's associated (and internal)
future-waiter field is null, we won't run into the (same?) prior hanging
issues (maybe since there's nothing for `asyncio` internals to use to
wait XD ??) when `Task.cancel()` is used..??
Main deats,
- add and `Future.set_exception()` a new signal-exception
`class TrioTaskExited(AsyncioCancelled):` whenever the trio-task exits
gracefully and the asyncio-side task is still doing blocking work (of
some sort) which *seem to* be predicated by a check that
`._fut_waiter is not None`.
- always call `asyncio.Queue.shutdown()` for the same^ as well as
whenever we decide to call `Task.cancel()`; in that case the shutdown
relays correctly?
Some further refinements,
- only warn about `Task.cancel()` usage when actually used ;)
- more local scope vars setting in the exit phase of
`translate_aio_errors()`.
- also in ^ use explicit caught-exc var names for each error-type.
Since it can not only cause the guest-mode run to abandon but also in
some edge cases prevent `trio`-errors from propagating (at least on
py3.12-13?) as discovered as part of supporting this mode officially
in the *root actor*.
As such try to avoid that method as much as possible instead opting to
pass the `trio`-side error via the iter-task channel ref.
Deats,
- add a `LinkedTaskChannel._trio_err: BaseException|None` which gets set
whenver the `trio.Task` error is caught; ONLY set `AsyncioCancelled`
when the `trio` task was for sure the cause, whether itself cancelled
or errored.
- always check for this error when exiting the `asyncio` side (even when
terminated via a call to `asyncio.Task.cancel()` or during any other
`CancelledError` handling such that the `asyncio`-task can expect to
handle `AsyncioCancelled` due to the above^^ cases.
- never `cs.cancel()` the `trio` side unless that cancel scope has not
yet been `.cancel_called` whatsoever; it's a noop anyway.
- only raise any exc from `asyncio.Task.result()` when `chan._aio_err`
does not already match it since the existence of the pre-existing
`task_err` means `asyncio` prolly intends (or has already) raised and
interrupted the task elsewhere.
Various supporting tweaks,
- don't bother maybe-init-ing `greenback` from the actor entrypoint
since we already need to (and do) bestow the portals to each `asyncio`
task spawned using the `run_task()`/`open_channel_from()` API; further
the init-ing should be done already by client code that enables
infected mode (even in the root actor).
|_we should prolly also codify it from any
`run_daemon(infected_aio=True, debug_mode=True)` usage we offer.
- pass all the `_<field>`s to `Linked TaskChannel` explicitly in named
kwarg style.
- better sclang-style log reports throughout, particularly on teardowns.
- generally more/better comments and docs around (not well understood)
edge cases.
- prep to just inline `maybe_raise_aio_side_err()` closure..
When `.pause_from_sync()` is called from an `asyncio.Task` which was
never bestowed a portal we want to be mega pedantic about it; indicate
that the task was NOT spawned from our `.to_asyncio` API and likely by
some out-of-our-control code (normally using
`asyncio.ensure_future()/.create_task()`). Though `greenback` already
errors on such usage, it's not always clear why no portal exists;
explaining the situation of a 3rd-party-bg-spawned-task should avoid
dev confusion for most cases.
Impl deats,
- distinguish between an actor in infected mode versus the actual caller
of `.pause_from_sync()` being an `asyncio.Task` with more explicit
`asyncio_task` and `is_infected_aio` vars.
- ONLY in the case of being both an infected-mode-actor AND detecting
that the caller is an `asyncio.Task`, check `greenback.has_portal()`
such that when not bestowed we presume the aforementioned
3rd-party-bg-task case above and raise a new explicit RTE with
a detailed explanatory message.
- add some masked draft code for handling the speical case of a root
actor `asyncio.Task` caller which could (in theory) not actually
require gb portal use since the `Lock` can be acquired directly
without IPC.
|_this will likely require factoring of various pause machinery funcs
into a `_pause_from_root_task()` to mk the impl sane XD
Other,
- expose a new `debug_filter: Callable` which can be provided by the
caller of `_maybe_enter_pm()` to predicate whether to enter the
debugger REPL based on the caught `BaseException|BaseExceptionGroup`;
this is handy for customizing the meaning of "graceful cancellations"
so as to avoid crash handling on expected egs of more then
`trioCancelled`.
|_ make the default as it was implemented: `not is_multi_cancelled(err)`
- pass-through a new `ignore: set[BaseException]` as
`open_crash_handler(ignore_nested=ignore)` to allow for the same
silent-cancellation-egs-swallowing as desired from outside the actor
runtime.
Such that equivalents of `trio.Cancelled` from other runtimes such as
`asyncio.CancelledError` and `subprocess.CalledProcessError` (with
a `.returncode == -2`) can be gracefully ignored as needed by the
caller.
For example this is handy if you want to avoid debug-mode REPL entry on
an exception-group full of only some subset of exception types since you
expect certain tasks to raise such errors after having been cancelled by
a request from some parent supervision sys (some "higher up"
`trio.CancelScope`, a remote triggered `ContextCancelled` or just from
and OS SIGINT).
Impl deats,
- offer a new `ignore_nested: set[BaseException]` param which by
default we add `trio.Cancelled` to when no other types are provided.
- use `ExceptionGroup.subgroup(tuple(ignore_nested)` to filter to egs of
the "ignored sub-errors set" and return any such match (instead of
`True`).
- detail a comment on exclusion case.
Such that we can hook into 3rd-party-libs more easily to monkey them and
use our (prettier/hipper) console logging with something like (an
example from the client project `modden`),
```python
connection_mod = i3ipc.connection
tractor_style_i3ipc_logger: logging.LoggingAdapter = tractor.log.get_console_log(
_root_name=connection_mod.__name__,
logger=i3ipc.connection_mod.logger,
level='info',
)
# monkey the instance-ref in 3rd-party module
connection_mod.logger = our_logger
```
Impl deats,
- expose as `get_console_log(logger: logging.Logger)` and add default
failover logic.
- toss in more typing, also for mod-global instance.
Such that you can use,
```python
tractor.to_asyncio.run_as_asyncio_guest(
trio_main=_trio_main,
)
```
to boostrap the root actor (and thus main parent process) to embed
the actor-rumtime into an `asyncio` loop. Prove it all works with an
subactor-free version of the aio echo-server test suite B)
For comparing a `msgspec.Struct` against an input `dict` presumably to
be used as input for struct instantiation. The main diff with
`.__sub__()` is that non-existing fields on either are reported
(loudly).
Such that maybe we can eventually offer a nicer higher-level API which
implements much of the boilerplate required by `msgspec` (like
type-matched branching to serialization logic) via a type-table
interface or something?
Not sure if the idea is that useful so leaving it all as TODOs for now
obviously.
Ensuring we can at least use `breakpoint()` from an infected actor's
`asyncio.Task` spawned via a `.to_asyncio` API.
Also includes a little `tests/devx/` reorging,
- start splitting out non-`tractor.pause()` tests into a new
`test_pause_from_non_trio.py` for all the `.pause_from_sync()`
use in bg-threaded or `asyncio` applications.
- factor harness commonalities to the `devx/conftest` (namely
the `do_ctlc()` masher).
- mv `test_pause_from_sync` to the new non`-trio` mod.
NOTE, the `ctlc=True` is still failing for
`test_pause_from_asyncio_task` which is a user-happiness bug but not
anything fundamentally broken - just need to handle the `asyncio` case
in `.devx._debug.sigint_shield()`!
Mostly fixing edge cases with `asyncio` and/or bg threads where the
`.repl_release: trio.Event` needs to be used from the main `trio`
thread OW confusing-but-valid teardown tracebacks can show under various
races.
Also improve,
- log reporting for such internal bugs to make them more obvious on
console via `log.exception()`.
- only restore the SIGINT handler when runtime is (still) active.
- reporting when `tractor.pause(shield=True)` should be used and
unhiding the internal frames from the tb in that case.
- for `pause_from_sync()` some deep fixes..
|_add a `allow_no_runtime: bool = False` flag to allow
**not** requiring the actor runtime to be active.
|_fix the `greenback` case-branch to only trigger on `not
is_trio_thread`.
|_add a scope-global `repl_owner: Task|Thread|None = None` to
avoid ref errors..
Various `try`/`except` blocks around external APIs that raise when not
running inside an `tractor` and/or some async framework (mostly to avoid
too-late/benign error tbs on certain classes of actor tree teardown):
- for the `log.pdb()` prompts emitted before REPL console entry.
- inside `DebugStatus.is_main_trio_thread()`'s call to `sniffio`.
- in `_post_mortem()` by catching `NoRuntime` when called from a thread
still active after the `.open_root_actor()` has already exited.
Also,
- create a dedicated `DebugStateError` for raising instead of `assert`s
when we have actual debug-request inconsistencies (as seem to be most
likely with bg thread usage of `breakpoint()`).
- show the `open_crash_handler()` frame on `bdb.BdbQuit` (for now?)
Since it seems that `pdbp.xpm()` can sometimes lose the up-stack
traceback info/frames? Not sure why but ours seems to work just fine
from a `asyncio`-handler in `modden`'s use of `i3ipc` B)
Also call `DebugStatus.shield_sigint()` from `pause_from_sync()` in the
infected-`asyncio` case to get the same shielding behaviour as in all
other usage!
Mostly due to magic from @oremanj where we slap in a little bit of
`.from_asyncio`-type stuff to run a `trio`-task from `asyncio.Task`
code!
I'm not gonna go into tooo too much detail but basically the primary
thing needed was a way to (blocking-ly) invoke a `trio.lowlevel.Task`
from an `asyncio` one (which we now have with a new
`run_trio_task_in_future()` thanks to draft code from the aforementioned
jefe) which we now invoke from a dedicated aio case-branch inside
`.devx._debug.pause_from_sync()`. Further include a case inside
`DebugStatus.release()` to handle using the same func to set the
`repl_release: trio.Event` from the aio side when releasing the REPL on
exit cmds.
Prolly more refinements to come ;{o
It was expecting `AssertionError` as a proceed-in-test signal (by
breaking from a continue loop), but `in_prompt_msg(raise_on_err=True)`
was changed to raise `ValueError`; so instead just use as a predicate
for the `break`.
Also rework `in_prompt_msg()` to accept the `child: BaseSpawn` as input
instead of `before: str` remove the casting boilerplate, and adjust all
usage to match.
Just like we've started doing throughout the rest of the actor runtime
for reporting (and where "sclang" = "structured conc (s)lang", our
little supervision-focused operations syntax i've been playing with in
log msg content).
Further tweaks:
- report the `trio_done_fute` alongside the `main_outcome` value.
- add a todo list for supporting `greenback` for pause points.
The reason for this "duplication" with the `--asyncio` CLI flag (passed
to the child during spawn) is 2-fold:
- allows verifying inside `Actor._from_parent()` that the `trio` runtime was
started via `.start_guest_run()` as well as if the
`Actor._infected_aio` spawn-entrypoint value has been set (by the
`._entry.<spawn-backend>_main()` whenever `--asyncio` is passed)
such that any mismatch can be signaled via an `InternalError`.
- enables checking the `._state._runtime_vars['_is_infected_aio']` value
directly (say from a non-actor/`trio`-thread) instead of calling
`._state.current_actor(err_on_no_runtime=False)` in certain edge
cases.
Impl/testing deats:
- add `._state._runtime_vars['_is_infected_aio'] = False` default.
- raise `InternalError` on any `--asyncio`-flag-passed vs.
`_runtime_vars`-value-relayed-from-parent inside
`Actor._from_parent()` and include a `Runner.is_guest` assert for good
measure B)
- set and relay `infect_asyncio: bool` via runtime-vars to child in
`ActorNursery.start_actor()`.
- verify `actor.is_infected_aio()`, `actor._infected_aio` and
`_state._runtime_vars['_is_infected_aio']` are all set in test suite's
`asyncio_actor()` endpoint.
By re-purposing our `pexpect`-based console matching with a new
`debugging/shield_hang_in_sub.py` example, this tests a few "hanging
actor" conditions more formally:
- that despite a hanging actor's task we can dump
a `stackscope.extract()` tree on relay of `SIGUSR1`.
- the actor tree will terminate despite a shielded forever-sleep by our
"T-800" zombie reaper machinery activating and hard killing the
underlying subprocess.
Some test deats:
- simulates the expect actions of a real user by manually using
`os.kill()` to send both signals to the actor-tree program.
- `pexpect`-matches against `log.devx()` emissions under normal
`debug_mode == True` usage.
- ensure we get the actual "T-800 deployed" `log.error()` msg and
that the actor tree eventually terminates!
Surrounding (re-org/impl/test-suite) changes:
- allow disabling usage via a `maybe_enable_greenback: bool` to
`open_root_actor()` but enable by def.
- pretty up the actual `.devx()` content from `.devx._stackscope`
including be extra pedantic about the conc-primitives for each signal
event.
- try to avoid double handles of `SIGUSR1` even though it seems the
original (what i thought was a) problem was actually just double
logging in the handler..
|_ avoid double applying the handler func via `signal.signal()`,
|_ use a global to avoid double handle func calls and,
|_ a `threading.RLock` around handling.
- move common fixtures and helper routines from `test_debugger` to
`tests/devx/conftest.py` and import them for use in both test mods.
The final issue was making sure we do the same thing on ctl-c/SIGINT
from the user. That is, if there's already a bg-thread in REPL, we
`log.pdb()` about SIGINT shielding and re-draw the prompt; the same UX
as normal actor-runtime-task behaviour.
Reasons this wasn't workin.. and the fix:
- `.pause_from_sync()` was overriding the local `repl` var with `None`
delivered by (transitive) calls to `_pause(debug_func=None)`.. so
remove all that and only assign it OAOO prior to thread-type case
branching.
- always call `DebugStatus.shield_sigint()` as needed from all requesting
threads/tasks:
- in `_pause_from_bg_root_thread()` BEFORE calling `._pause()` AND BEFORE
yielding back to the bg-thread via `.started(out)` to ensure we're
definitely overriding the handler in the `trio`-main-thread task
before unblocking the requesting bg-thread.
- from any requesting bg-thread in the root actor such that both its
main-`trio`-thread scheduled task (as per above bullet) AND it are
SIGINT shielded.
- always call `.shield_sigint()` BEFORE any `greenback._await()` case
don't entirely grok why yet, but it works)?
- for `greenback._await()` case always set `bg_task` to the current one..
- tweaks to the `SIGINT` handler, now renamed `sigint_shield()` so as
not to name-collide with the methods when editor-searching:
- always try to `repr()` the REPL thread/task "owner" as well as the
active `PdbREPL` instance.
- add `.devx()` notes around the prompt flushing deats and comments
for any root-actor-bg-thread edge cases.
Related/supporting refinements:
- add `get_lock()`/`get_debug_req()` factory funcs since the plan is to
eventually implement both as `@singleton` instances per actor.
- fix `acquire_debug_lock()`'s call-sig-bug for scheduling
`request_root_stdio_lock()`..
- in `._pause()` only call `mk_pdb()` when `debug_func != None`.
- add some todo/warning notes around the `cls.repl = None` in
`DebugStatus.release()`
`test_pause_from_sync()` tweaks:
- don't use a `attach_patts.copy()`, since we always `break` on match.
- do `pytest.fail()` on that ^ loop's fallthrough..
- pass `do_ctlc(child, patt=attach_key)` such that we always match the
the current thread's name with the ctl-c triggered `.pdb()` emission.
- oh yeah, return the last `before: str` from `do_ctlc()`.
- in the script, flip `abandon_on_cancel=True` since when `False` it
seems to cause `trio.run()` to hang on exit from the last bg-thread
case?!?
In `lock_stdio_for_peer()` better internal-error handling/reporting:
- only `Lock._blocked.remove(ctx.cid)` if that same cid was added on
entry to avoid needless key-errors.
- drop all `Lock.release(force: bool)` usage remnants.
- if `req_ctx.cancel()` fails mention it with `ctx_err.add_note()`.
- add more explicit internal-failed-request log messaging via a new
`fail_reason: str`.
- use and use new `x)<=\n|_` annots in any failure logging.
Other cleanups/niceties:
- drop `force: bool` flag entirely from the `Lock.release()`.
- use more supervisor-op-annots in `.pdb()` logging
with both `_pause/crash_msg: str` instead of double '|' lines when
`.pdb()`-reported from `._set_trace()`/`._post_mortem()`.
Turns out it does work XD
Prior presumption was from before I had the fute poll-loop so makes
sense we needed more then one sched-tick's worth of context switch vs.
now we can just keep looping-n-pumping as fast possible until the
guest-run's main task completes.
Also,
- minimize the preface commentary (as per todo) now that we have tests
codifying all the edge cases :finger_crossed:
- parameter-ize the pump-loop-cycle delay and default it to 0.
To make the recent set of tests pass this (hopefully) finally solves all
`asyncio` embedded `trio` guest-run abandonment by ensuring we "pump the
event loop" until the guest-run future is fully complete.
Accomplished via simple poll loop of the form `while not
trio_done_fut.done(): await asyncio.sleep(.1)` in the `aio_main()`
task's exception teardown sequence. The loop does a naive 10ms
"pump-via-sleep & poll" for the `trio` side to complete before finally
exiting (and presumably raising) from the SIGINT cancellation.
Other related cleanups and refinements:
- use `asyncio.Task.result()` inside `cancel_trio()` since it also
inline-raises any exception outcome and we can also log-report the
result in non-error cases.
- comment out buncha not-sure-we-need-it stuff in `cancel_trio()`.
- remove the botched `AsyncioCancelled(CancelledError):` idea obvi XD
- comment `greenback` init for now in `aio_main()` since (pretty sure)
we don't ever want to actually REPL in that specific func-as-task?
- always capture any `fute_err: BaseException` from the `main_outcome:
Outcome` delivered by the `trio` side guest-run task.
- add and raise a new super noisy `AsyncioRuntimeTranslationError`
whenever we detect that the guest-run `trio_done_fut` has not
completed before task exit; should avoid abandonment issues ever
happening again without knowing!
Finally this reproduces the issue as it (originally?) exhibited inside
`piker` where the `Actor.lifetime_stack` wasn't closed in cases where
during `infected_aio`-actor cancellation/shutdown `trio` side tasks
which are doing shielded (teardown) work are NOT being watched/waited on
from the `aio_main()` task-closure inside `run_as_asyncio_guest()`!
This is then the root cause of the guest-run being abandoned since if
our `aio_main()` task-closure doesn't know it should allow the run to
finish, it's going to call `loop.close()` eventually resulting in the
`GeneratorExit` thrown into `trio._core._run.unrolled_run()`..
So, this extends the `test_sigint_closes_lifetime_stack()` suite to
include cases for such shielded `trio`-task ops:
- add a new `trio_side_is_shielded: bool` which will toggle whether to
add a shielded 0.5s `trio.sleep()` loop to `manage_file()` which
should outlive the `asyncio` event-loop shutdown sequence and result
in an abandoned guest-run and thus a leaked file.
- parametrize the existing suite with this case resulting in a total 16
test set B)
This patch demonstrates the problem with our `aio_main()` task-closure
impl via the now 4 failing tests, a fix is coming in a follow up commit!
Turns out it somehow breaks our `to_asyncio` error relay since obvi
`asyncio`'s runtime seems to specially handle it (prolly via
`isinstance()` ?) and it caused our
`test_aio_cancelled_from_aio_causes_trio_cancelled()` to hang..
Further, obvi `unpack_error()` won't be able to find the type def if not
kept inside `._exceptions`..
So given all that, revert the change/move as well as:
- tweak the aio-from-aio cancel test to timeout.
- do `trio.sleep()` conc with any bg aio task by moving out nursery
block.
- add a `send_sigint_to: str` parameter to
`test_sigint_closes_lifetime_stack()` such that we test the SIGINT
being relayed to just the parent or the child.
Took me a while to figure out what the heck was going on but, turns out
`asyncio` changed their SIGINT handling in 3.11 as per:
https://docs.python.org/3/library/asyncio-runner.html#handling-keyboard-interruption
I'm not entirely sure if it's the 3.11 changes or possibly wtv further
updates were made in 3.12 but more or less due to the way
our current main task was written the `trio` guest-run was getting
abandoned on SIGINTs sent from the OS to the infected child proc..
Note that much of the bug and soln cases are layed out in very detailed
comment-notes both in the new test and `run_as_asyncio_guest()`, right
above the final "fix" lines.
Add new `test_infected_aio.test_sigint_closes_lifetime_stack()` test suite
which reliably triggers all abandonment issues with multiple cases
of different parent behaviour post-sending-SIGINT-to-child:
1. briefly sleep then raise a KBI in the parent which was originally
demonstrating the file leak not being cleaned up by `Actor.lifetime_stack.close()`
and simulates a ctl-c from the console (relayed in tandem by
the OS to the parent and child processes).
2. do `Context.wait_for_result()` on the child context which would
hang and timeout since the actor runtime would never complete and
thus never relay a `ContextCancelled`.
3. both with and without running a `asyncio` task in the `manage_file`
child actor; originally it seemed that with an aio task scheduled in
the child actor the guest-run abandonment always was the "loud" case
where there seemed to be some actor teardown but with tbs from
python failing to gracefully exit the `trio` runtime..
The (seemingly working) "fix" required 2 lines of code to be run inside
a `asyncio.CancelledError` handler around the call to `await trio_done_fut`:
- `Actor.cancel_soon()` which schedules the actor runtime to cancel on
the next `trio` runner cycle and results in a "self cancellation" of
the actor.
- "pumping the `asyncio` event loop" with a non-0 `.sleep(0.1)` XD
|_ seems that a "shielded" pump with some actual `delay: float >= 0`
did the trick to get `asyncio` to allow the `trio` runner/loop to
fully complete its guest-run without abandonment.
Other supporting changes:
- move `._exceptions.AsyncioCancelled`, our renamed
`asyncio.CancelledError` error-sub-type-wrapper, to `.to_asyncio` and make
it derive from `CancelledError` so as to be sure when raised by our
`asyncio` x-> `trio` exception relay machinery that `asyncio` is
getting the specific type it expects during cancellation.
- do "summary status" style logging in `run_as_asyncio_guest()` wherein
we compile the eventual `startup_msg: str` emitted just before waiting
on the `trio_done_fut`.
- shield-wait with `out: Outcome = await asyncio.shield(trio_done_fut)`
even though it seems to do nothing in the SIGINT handling case..(I
presume it might help avoid abandonment in a `asyncio.Task.cancel()`
case maybe?)
As in whenever `Context.cancel()` is not (runtime internally) called
(i.e. `._cancel_called` is not set), we can attempt to detect the parent
`trio` nursery/cancel-scope that is the source. Emit the report with
a `.cancel()` level and attempt to repr in "sclang" form as well as
unhide the stack frame for debug/traceback-in.
There's a been a todo for soo long for this XD
Since all `Actor`'s store a set of `._peers` we can try a lookup on that
table as a shortcut before pinging the registry Bo
Impl deats:
- add a new `._discovery.get_peer_by_name()` routine which attempts the
`._peers` lookup by combining a copy of that `dict` + an entry added
for `Actor._parent_chan` (since all subs have a parent and often the
desired contact is just that connection).
- change `.find_actor()` (for the `only_first == True` case),
`.query_actor()` and `.wait_for_actor()` to call the new helper and
deliver appropriate outputs if possible.
Other,
- deprecate `get_arbiter()` def and all usage in tests and examples.
- drop lingering use of `arbiter_sockaddr` arg to various routines.
- tweak the `Actor` doc str as well as some code fmting and a tweak to
the `._stream_handler()`'s initial `con_status: str` logging value
since the way it was could never be reached.. oh and `.warning()` on
any new connections which already have a `_pre_chan: Channel` entry in
`._peers` so we can start minimizing IPC duplications.
In the `drain_to_final_msg()` impl, since a stream terminating
gracefully requires this msg, there's really no reason to `log.cancel()`
about it; go `.runtime()` level instead since we're trying de-noise
under "normal operation".
Also,
- passthrough `hide_tb` to taskc-handler's `ctx.maybe_raise()` call.
- raise `MessagingError` for the `MsgType` unmatched `case _:`.
- detail the doc string motivation a little more.
As per a WIP scribbled out TODO in `._entry.nest_from_op()`, change
a bunch of "supervisor/lifetime mgmt ops" related log messages to
contain some supervisor-annotation "headers" in an effort to give
a terser "visual indication" of how some execution/scope/storage
primitive entity (like an actor/task/ctx/connection) is being operated
on (like, opening/started/closed/cancelled/erroring) from a "supervisor
action" POV.
Also tweak a bunch more emissions to lower levels to reduce noise around
normal inter-actor operations like process and IPC ctx supervision.
To avoid showing lowlevel details of exception handling around the
underlying call to `return await self._ctx._pld_rx.recv_pld(ipc=self)`,
any time a `RemoteActorError` is unpacked (an raised locally) we re-raise
it directly from the captured `src_err` captured so as to present to
the user/app caller-code an exception raised directly from the `.receive()`
frame. This simplifies traceback call-stacks for any `log.exception()`
or `pdb`-REPL output filtering out the lower `PldRx` frames by default.
Since it was all ad-hoc defined inside
`._ipc.MsgpackTCPStream._iter_pkts()` more or less, this starts
formalizing a way for particular transport backends to indicate whether
a disconnect condition should be re-raised in the RPC msg loop and if
not what log level to report it at (if any).
Based on our lone transport currently we try to suppress any logging
noise from ephemeral connections expected during normal actor
interaction and discovery subsys ops:
- any short lived discovery related TCP connects are only logged as
`.transport()` level.
- both `.error()` and raise on any underlying `trio.ClosedResource`
cause since that normally means some task touched transport layer
internals that it shouldn't have.
- do a `.warning()` on anything else unexpected.
Impl deats:
- extend the `._exceptions.TransportClosed` to accept an input log
level, raise-on-report toggle and custom reporting & raising via a new
`.report_n_maybe_raise()` method.
- construct the TCs with inputs per case in (the newly named) `._iter_pkts().
- call ^ this method from the `TransportClosed` handler block inside the
RPC msg loop thus delegating reporting levels and/or raising to the
backend's per-case TC instantiating.
Related `._ipc` changes:
- mask out all the `MsgpackTCPStream._codec` debug helper stuff and drop
any lingering cruft from the initial proto-ing of msg-codecs.
- rename some attrs/methods:
|_`MsgpackTCPStream._iter_packets()` -> `._iter_pkts()` and
`._agen` -> `_aiter_pkts`.
|_`Channel._aiter_recv()` -> `._aiter_msgs()` and
`._agen` -> `_aiter_msgs`.
- add `hide_tb: bool` support to `Channel.send()` and only show the
frame on non-MTEs.
- allow passing and report the lib name (`trio` or `tractor`) from
`maybe_open_nursery()`.
- use `.runtime()` level when reporting `_Cache`-hits in
`maybe_open_context()`.
- tidy up some doc strings.
In case the struct doesn't import a field type (which will cause the
`.pformat()` to raise) just report the issue and try to fall back to the
original `repr()` version.
It's too fragile to put in side core RPC machinery since
`msgspec.Struct` defs can fail if a field type can't be
looked up at creation time (like can easily happen if you
conditionally import using `if TYPE_CHECKING:`)
Also,
- rename `cs` to `rpc_ctx_cs: CancelScope` since it's literally
the wrapping RPC `Context._scope`.
- report self cancellation via `explain: str` and add tail case for
"unknown cause".
- put a ?TODO? around what to do about KBIs if a context is opened
from an `infected_aio`-actor task.
- similar to our nursery and portal add TODO list for moving all
`_invoke_non_context()` content out the RPC core and instead implement
them as `.hilevel` endpoint helpers (maybe as decorators?)which under
neath define `@context`-funcs.
Log-report the different types of actor exit conditions including cancel
via KBI, error or normal return with varying levels depending on case.
Also, start proto-ing out this weird ascii-syntax idea for describing
conc system states and implement the first bit in a `nest_from_op()`
log-message fmter that joins and indents an obj `repr()` with
a tree-like `'>)\n|_'` header.
Since we more or less require it for `tractor.pause_from_sync()` this
refines enable toggles and their relay down the actor tree as well as
more explicit logging around init and activation.
Tweaks summary:
- `.info()` report the module if discovered during root boot.
- use a `._state._runtime_vars['use_greenback']: bool` activation flag
inside `Actor._from_parent()` to determine if the sub should try to
use it and set to `False` if mod-loading fails / not installed.
- expose `maybe_init_greenback()` from `.devx` sugpkg.
- comment out RTE in `._pause()` for now since we already have it in
`.pause_from_sync()`.
- always `.exception()` on `maybe_init_greenback()` import errors to
clarify the underlying failure deats.
- always explicitly report if `._state._runtime_vars['use_greenback']`
was NOT set when `.pause_from_sync()` is called.
Other `._runtime.async_main()` adjustments:
- combine the "internal error call ur parents" message and the failed
registry contact status into one new `err_report: str`.
- drop the final exception handler's call to
`Actor.lifetime_stack.close()` since we're already doing it in the
`finally:` block and the earlier call has no currently known benefit.
- only report on the `.lifetime_stack()` callbacks if any are detected
as registered.
Not sure how I forgot this but, obviously it's correct context-var
semantics to revert the current IPC `Context` (set in the latest
`.open_context()` block) such that any prior instance is reset..
This ensures the sanity `assert`s pass inside
`.msg._ops.maybe_limit_plds()` and just in general ensures for any task
that the last opened `Context` is the one returned from
`current_ipc_ctx()`.
This change is adding commentary about the upcoming API removal and
simplification of nursery + portal internals; no actual code changes are
included.
The plan to (re)move the old RPC methods:
- `ActorNursery.run_in_actor()`
- `Portal.run()`
- `Portal.run_from_ns()`
and any related impl internals out of each conc-primitive and instead
into something like a `.hilevel.rpc` set of APIs which then are all
implemented using the newer and more lowlevel `Context`/`MsgStream`
primitives instead Bo
Further,
- formally deprecate the `Portal.result()` meth for
`.wait_for_result()`.
- only `log.info()` about runtime shutdown in the implicit root case.
Might as well add a public maybe-getter for use on the "parent" side
since it can be handy to check out-of-band cancellation conditions (like
from `Portal.cancel_actor()`).
Buncha bitty tweaks for more easily debugging cancel conditions:
- add a `@.cancel_called.setter` for hooking into `.cancel_called = True`
being set in hard to decipher "who cancelled us" scenarios.
- use a new `self_ctxc: bool` var in `.cancel()` to capture the output
state from `._is_self_cancelled(remote_error)` at call time so it can
be compared against the measured value at crash-time (when REPL-ing it
can often have already changed due to runtime teardown sequencing vs.
the crash handler hook entry).
- proxy `hide_tb` to `.drain_to_final_msg()` from `.wait_for_result()`.
- use `remote_error.sender` attr directly instead of through
`RAE.msgdata: dict` lookup.
- change var name `our_uid` -> `peer_uid`; it's not "ours"..
Other various docs/comment updates:
- extend the main class doc to include some other name ideas.
- change over all remaining `.result()` refs to `.wait_for_result()`.
- doc more details on how we want `.outcome` to eventually signature.
Since a local-actor-nursery-parented subactor might also use the root as
its registry, we need to avoid warning when short lived IPC `Channel`
connections establish and then disconnect (quickly, bc the apparently
the subactor isn't re-using an already cached parente-peer<->child conn
as you'd expect efficiency..) since such cases currently considered
normal operation of our super shoddy/naive "discovery sys" XD
As such, (un)guard the whole local-actor-nursery OR channel-draining
waiting blocks with the additional `or Actor._cancel_called` branch
since really we should also be waiting on the parent nurse to exit (at
least, for sure and always) when the local `Actor` indeed has been
"globally" cancelled-called. Further add separate timeout warnings for
channel-draining vs. local-actor-nursery-exit waiting since they are
technically orthogonal cases (at least, afaik).
Also,
- adjust the `Actor._stream_handler()` connection status log-emit to
`.runtime()`, especially to reduce noise around the aforementioned
ephemeral registree connection-requests.
- if we do wait on a local actor-nurse to exit, report its `._children`
table (which should help figure out going forward how useful the
warning is, if at all).
Name them `_mk_send_mte()`/`_mk_recv_mte()` and change the runtime to
call each appropriately depending on location/usage.
Also add some dynamic call-frame "unhide" blocks such that when we
expect raised MTE from the aboves calls but we get a different
unexpected error from the runtime, we ensure the call stack downward is
shown in tbs/pdb.
|_ ideally in the longer run we come up with a fancier dynamic sys for
this, prolly something in `.devx._frame_stack`?
Just pass `_bad_msg` such that it get's injected to `.msgdata` since
with a send-side `MsgTypeError` we don't have a remote `._ipc_msg:
Error` per say to include.
The tests only use one input spec (conveniently) so there's not much to
change in the logic,
- only pass the `maybe_msg_spec` to the child-side decorator and obvi
drop the surrounding `msgops.limit_plds()` block in the child.
- tweak a few `MsgDec` asserts, mostly dropping the
`msg._ops._def_any_spec` state checks since the child-side won't have
any pre pld-spec state given the runtime now applies the `pld_spec`
before running the task's func body.
- also allowed dropping the `finally:` which did a similar check
outside the `.limit_plds()` block.
Namely passing the `.__pld_spec__` directly to the
`lock_stdio_for_peer()` decorator B)
Also, allows dropping `apply_debug_pldec()` (which was a todo) and
removing a `lock_stdio_for_peer()` indent level.
Instead of the WIP/prototyped `Portal.open_context()` offering
a `pld_spec` input arg, this changes to a proper decorator API for
specifying the "payload spec" on `@context` endpoints.
The impl change details actually cover 2-birds:
- monkey patch decorated functions with a new
`._tractor_context_meta: dict[str, Any]` and insert any provided input
`@context` kwargs: `_pld_spec`, `enc_hook`, `enc_hook`.
- use `inspect.get_annotations()` to scan for a `func` arg
type-annotated with `tractor.Context` and use the name of that arg as
the RPC task-side injected `Context`, thus injecting the needed arg
by type instead of by name (a longstanding TODO); raise a type-error
when not found.
- pull the `pld_spec` from the `._tractor_context_meta` attr both in the
`.open_context()` parent-side and child-side `._invoke()`-cation of
the RPC task and use the `msg._ops.maybe_limit_plds()` API to apply it
internally in the runtime for each case.
`RemoteActorError`s show this by default in their `.__repr__()`, and we
obvi capture and embed the src traceback in an `Error` msg prior to
transit, but for logging it's also handy to see the tb of any set
`Context._remote_error` on console especially when trying to decipher
remote error details at their origin actor. Also improve the log message
description using `ctx.repr_state` and show any `ctx.outcome`.
Longer run we don't want `tractor` app devs having to call
`msg._ops.limit_plds()` from every child endpoint.. so this starts
a list of decorator API ideas and obviously ties in with an ideal final
API design that will come with py3.13 and typed funcs. Obviously this
is directly fueled by,
- https://github.com/goodboy/tractor/issues/365
Other,
- type with direct `trio.lowlevel.Task` import.
- use `log.exception()` to show tbs for all error-terminations in
`.open_context()` (for now) and always explicitly mention the `.side`.
Hopefully would make grok-ing this fairly sophisticated sub-sys possible
for any up-and-coming `tractor` hacker
XD
A lot of internal API and re-org ideas I discovered/realized as part of
finishing the `__pld_spec__` and multi-threaded support. Particularly
better isolation between root-actor vs subactor task APIs and generally
less globally-state-ful stuff like `DebugStatus` and `Lock` method APIs
would likely make a lot of the hard to follow edge cases more clear?
Functionally working for multi-threaded (via cpython threads spawned
from `to_trio.to_thread.run_sync()`) alongside subactors, tested (for
now) only with threads started inside the root actor (which seemed to
have the most issues in terms of the impl and special cases..) using the
new `tractor.pause_from_sync()` API!
Main implementation changes to `.pause_from_sync()`
------ - ------
- from the root actor, we need to ensure bg thread case is handled
*specially* since no IPC is used to request the TTY stdio mutex and
`Lock` (API) usage is conducted entirely from a local task or thread;
dedicated `Lock` usage for the root-actor already is branched inside
`._pause()` and needs similar handling from a root bg-thread:
|_for the special case of a root bg thread we need to
`trio`-main-thread schedule a bg task inside a new
`_pause_from_bg_root_thread()`. The new task needs to implement most
of what was is handled inside `._pause()` manually, mostly because in
this root-actor-bg-thread case we have 2 constraints:
1. to enter `PdbREPL.interaction()` **from the bg thread** directly,
2. the task that `Lock._debug_lock.acquire()`s has to be the same
that calls `.release() (a `trio.FIFOLock` constraint)
|_impl deats of this `_pause_from_bg_root_thread()` include:
- (for now) calling `._pause()` to acquire the `Lock._debug_lock`.
- setting its own `DebugStatus.repl_release`.
- calling `.DebugStatus.shield_sigint()` to ensure the root's
main thread uses the right handler when the bg one is REPL-ing.
- wait manually on the `.repl_release()` to be set by the thread's
dedicated `PdbREPL` exit.
- manually calling `Lock.release()` from the **same task** that
acquired it.
- expect calls to `._pause()` to deliver a `tuple[Task, PdbREPL]` such
that we always get the handle both to any newly created REPl instance
and the (maybe) the scheduled bg task within which is runs.
- add a single `message: str` style to `log.devx()` based on branching
style for logging.
- ensure both `DebugStatus.repl` and `.repl_task` are set **just
before** calling `._set_trace()` to ensure the correct `Task|Thread`
is set when the REPL is finally entered from sync code.
- add a wrapping caller `_sync_pause_from_builtin()` which passes in the
new `called_from_builtin=True` to indicate `breakpoint()` caller
usage, obvi pass in `api_frame`.
Changes to `._pause()` in support of ^
------ - ------
- `TaskStatus.started()` and return the `tuple[Task, PdbREPL]` to
callers / starters.
- only call `DebugStatus.shield_sigint()` when no `repl` passed bc some
callers (like bg threads) may need to apply it at some specific point
themselves.
- tweak some asserts for the `debug_func == None` / non-`trio`-thread
case.
- add a mod-level `_repl_fail_msg: str` to be used when there's an
internal `._pause()` failure for testing, easier to pexpect match.
- more comprehensive logging for the root-actor branched case to
(attempt to) indicate any of the 3 cases:
- remote ctx from subactor has the `Lock`,
- already existing root task or thread has it or,
- some kinda stale `.locked()` situation where the root has the lock
but we don't know why.
- for root usage, revert to always `await Lock._debug_lock.acquire()`-ing
despite `called_from_sync` since `.pause_from_sync()` was reworked to
instead handle the special bg thread case in the new
`_pause_from_bg_root_thread()` task.
- always do `return _enter_repl_sync(debug_func)`.
- try to report any `repl_task: Task|Thread` set by the caller
(particularly for the bg thread cases) as being the thread or task
`._pause()` was called "on behalf of"
Changes to `DebugStatus`/`Lock` in support of ^
------ - ------
- only call `Lock.release()` from `DebugStatus.set_[quit/continue]()`
when called from the main `trio` thread and always call
`DebugStatus.release()` **after** to ensure `.repl_released()` is set
**after** `._debug_lock.release()`.
- only call `.repl_release.set()` from `trio` thread otherwise use
`.from_thread.run()`.
- much more refinements in `Lock.release()` for threading cases:
- return `bool` to indicate whether lock was released by caller.
- mask (in prep to drop) `_pause()` usage of
`Lock.release.force=True)` since forcing a release can't ever avoid
the RTE from `trio`.. same task **must** acquire/release.
- don't allow usage from non-`trio`-main-threads, ever; there's no
point since the same-task-needs-to-manage-`FIFOLock` constraint.
- much more detailed logging using `message`-building-style for all
caller (edge) cases.
|_ use a `we_released: bool` to determine failed-to-release edge
cases which can happen if called from bg threads, ensure we
`log.exception()` on any incorrect usage resulting in release
failure.
|_ complain loudly if the release fails and some other task/thread
still holds the lock.
|_ be explicit about "who" (which task or thread) the release is "on
behalf of" by reading `DebugStatus.repl_task` since the caller
isn't the REPL operator in many sync cases.
- more or less drop `force` support, as mentioned above.
- ensure we unset `._owned_by_root` if the caller is a root task.
Other misc
------ - ------
- rename `lock_tty_for_child()` -> `lock_stdio_for_peer()`.
- rejig `Lock.repr()` to show lock and event stats.
- stage `Lock.stats` and `.owner` methods in prep for doing a singleton
instance and `@property`s.
Originally discovered as while using `tractor.pause_from_sync()`
from the `i3ipc` client running in a bg-thread that uses `asyncio`
inside `modden`.
Turns out we definitely aren't correctly handling `.pause_from_sync()`
from the root actor when called from a `trio.to_thread.run_sync()`
bg thread:
- root-actor bg threads which can't `Lock._debug_lock.acquire()` since
they aren't in `trio.Task`s.
- even if scheduled via `.to_thread.run_sync(_debug._pause)` the
acquirer won't be the task/thread which calls `Lock.release()` from
`PdbREPL` hooks; this results in a RTE raised by `trio`..
- multiple threads will step on each other's stdio since cpython's GIL
seems to ctx switch threads on every input from the user to the REPL
loop..
Reproduce via reworking our example and test so that they catch and fail
for all edge cases:
- rework the `/examples/debugging/sync_bp.py` example to demonstrate the
above issues, namely the stdio clobbering in the REPL when multiple
threads and/or a subactor try to debug simultaneously.
|_ run one thread using a task nursery to ensure it runs conc with the
nursery's parent task.
|_ ensure the bg threads run conc a subactor usage of
`.pause_from_sync()`.
|_ gravely detail all the special cases inside a TODO comment.
|_ add some control flags to `sync_pause()` helper and don't use
`breakpoint()` by default.
- extend and adjust `test_debugger.test_pause_from_sync` to match (and
thus currently fail) by ensuring exclusive `PdbREPL` attachment when
the 2 bg root-actor threads are concurrently interacting alongside the
subactor:
|_ should only see one of the `_pause_msg` logs at a time for either
one of the threads or the subactor.
|_ ensure each attaches (in no particular order) before expecting the
script to exit.
Impl adjustments to `.devx._debug`:
- drop `Lock.repl`, no longer used.
- add `Lock._owned_by_root: bool` for the `.ctx_in_debug == None`
root-actor-task active case.
- always `log.exception()` for any `._debug_lock.release()` ownership
RTE emitted by `trio`, like we used to..
- add special `Lock.release()` log message for the stale lock but
`._owned_by_root == True` case; oh yeah and actually
`log.devx(message)`..
- rename `Lock.acquire()` -> `.acquire_for_ctx()` since it's only ever
used from subactor IPC usage; well that and for local root-task
usage we should prolly add a `.acquire_from_root_task()`?
- buncha `._pause()` impl improvements:
|_ type `._pause()`'s `debug_func` as a `partial` as well.
|_ offer `called_from_sync: bool` and `called_from_bg_thread: bool`
for the special case handling when called from `.pause_from_sync()`
|_ only set `DebugStatus.repl/repl_task` when `debug_func != None`
(OW ensure the `.repl_task` is not the current one).
|_ handle error logging even when `debug_func is None`..
|_ lotsa detailed commentary around root-actor-bg-thread special cases.
- when `._set_trace(hide_tb=False)` do `pdbp.set_trace(frame=currentframe())`
so the `._debug` internal frames are always included.
- by default always hide tracebacks for `.pause[_from_sync]()` internals.
- improve `.pause_from_sync()` to avoid root-bg-thread crashes:
|_ pass new `called_from_xxx_` flags and ensure `DebugStatus.repl_task`
is actually set to the `threading.current_thread()` when needed.
|_ manually call `Lock._debug_lock.acquire_nowait()` for the non-bg
thread case.
|_ TODO: still need to implement the bg-thread case using a bg
`trio.Task`-in-thread with an `trio.Event` set by thread REPL exit.
Exactly like how it's organized for `Portal.open_context()`, put the
main streaming API `@acm` with the `MsgStream` code and bind the method
to the new module func.
Other,
- rename `Context.result()` -> `.wait_for_result()` to better match the
blocking semantics and rebind `.result()` as deprecated.
- add doc-str for `Context.maybe_raise()`.
It ended up getting necessarily implemented as the `PldRx` though at
a different layer and won't be needed as part of `MsgCodec` most likely,
though this original idea did provide the source of inspiration for how
things work now!
Also Move the commented TODO proto for a codec hook factory from
`.types` to `._codec` where it prolly better fits and update some msg
related todo/questions.
It's been a long time prepped and now finally implemented!
Offer a `shield: bool` argument from our async `._debug` APIs:
- `await tractor.pause(shield=True)`,
- `await tractor.post_mortem(shield=True)`
^-These-^ can now be used inside cancelled `trio.CancelScope`s,
something very handy when introspecting complex (distributed) system
tear/shut-downs particularly under remote error or (inter-peer)
cancellation conditions B)
Thanks to previous prepping in a prior attempt and various patches from
the rigorous rework of `.devx._debug` internals around typed msg specs,
there ain't much that was needed!
Impl deats
- obvi passthrough `shield` from the public API endpoints (was already
done from a prior attempt).
- put ad-hoc internal `with trio.CancelScope(shield=shield):` around all
checkpoints inside `._pause()` for both the root-process and subactor
case branches.
Add a fairly rigorous example, `examples/debugging/shielded_pause.py`
with a wrapping `pexpect` test, `test_debugger.test_shield_pause()` and
ensure it covers as many cases as i can think of offhand:
- multiple `.pause()` entries in a loop despite parent scope
cancellation in a subactor RPC task which itself spawns a sub-task.
- a `trio.Nursery.parent_task` which raises, is handled and
tries to enter and unshielded `.post_mortem()`, which of course
internally raises `Cancelled` in a `._pause()` checkpoint, so we catch
the `Cancelled` again and then debug the debugger's internal
cancellation with specific checks for the particular raising
checkpoint-LOC.
- do ^- the latter -^ for both subactor and root cases to ensure we
can debug `._pause()` itself when it tries to REPL engage from
a cancelled task scope Bo
Keep the old alias, but i think it's better form to use longer names for
internal public APIs and this name better reflects the functionality:
decoding and returning a `PayloadMsg.pld` field.
Since turns out we didn't have a single example using that API Bo
The test granular-ly checks all use cases:
- `.post_mortem()` manual calls in both subactor and root.
- ensuring built-in RPC crash handling activates after each manual one
from ^.
- drafted some call-stack frame checking that i commented out for now
since we need to first do ANSI escape code removal due to the
colorization that `pdbp` does by default.
|_ added a TODO with SO link on `assert_before()`.
Also todo-staged a shielded-pause test to match with the already
existing-but-needs-refinement example B)
Such that we're boxing the interchanged lib's specific error
`msgspec.ValidationError` in this case) type much like how
a `ContextCancelled[trio.Cancelled]` is composed; allows for seemless
multi-backend-codec support later as well B)
Pass `ctx.maybe_raise(from_src_exc=src_err)` where needed in a couple
spots; as `None` in the send-side `Started` MTE case to avoid showing
the `._scope1.cancel_called` result in the traceback from the
`.open_context()` child-sync phase.
That is as a control to `Context._maybe_raise_remote_err()` such that
if set to anything other then the default (`False` value), we do
`raise remote_error from from_src_exc` such that caller can choose to
suppress or override the `.__cause__` tb.
Also tidy up and old masked TODO regarding calling `.maybe_raise()`
after the caller exits from the `yield` in `.open_context()`..
Send-side `MsgTypeError`s actually shouldn't have any "boxed" traceback
per say since they're raised in the transmitting actor's local task env
and we (normally) don't want the ascii decoration added around the
error's `._message: str`, that is not until the exc is `pack_error()`-ed
before transit. As such, the presentation of an embedded traceback (and
its ascii box) gets bypassed when only a `._message: str` is set (as we
now do for pld-spec failures in `_mk_msg_type_err()`).
Further this tweaks the `.pformat()` output to include the `._message`
part to look like `<RemoteActorError( <._message> ) ..` instead of
jamming it implicitly to the end of the embedded `.tb_str` (as was done
implicitly by `unpack_error()`) and also adds better handling for the
`with_type_header == False` case including forcing that case when we
detect that the currently handled exc is the RAE in `.pformat()`.
Toss in a lengthier doc-str explaining it all.
Surrounding/supporting changes,
- better `unpack_error()` message which just briefly reports the remote
task's error type.
- add public `.message: str` prop.
- always set a `._extra_msgdata: dict` since some MTE props rely on it.
- handle `.boxed_type == None` for `.boxed_type_str`.
- maybe pack any detected input or `exc.message` in `pack_error()`.
- comment cruft cleanup in `_mk_msg_type_err()`.
Allows passing a custom error msg other then the traceback-str over the
wire. Make `.tb_str` optional (in the blank `''` sense) since it's
treated that way thus far in `._exceptions.pack_error()`.
Namely checking that `Context._remote_error` is set to the raised MTE
in the invalid started and return value cases since prior to the recent
underlying changes to the `Context.result()` impl, it would not match.
Further,
- do asserts for non-MTE raising cases in both the parent and child.
- add todos for testing ctx-outcomes for per-side-validation policies
i anticipate supporting and implied msg-dialog race cases therein.
More specifically, if `.open_context()` is cancelled when awaiting the
first `Context.started()` during the child task sync phase, check to see
if it was due to `._scope.cancel_called` and raise any remote error via
`.maybe_raise()` instead the `trio.Cancelled` like in every other
remote-error handling case. Ensure we set `._scope[_nursery]` only after
the `Started` has arrived and audited.
Since in the case of the `Actor._cancel_task()` related runtime eps we
actually don't EVER register them in `Actor._rpc_tasks`.. logging about
them is just needless noise, though maybe we should track them in a diff
table; something like a `._runtime_rpc_tasks`?
Drop the cancel-request-for-stale-RPC-task (`KeyError` case in
`Actor._cancel_task()`) log-emit level in to `.runtime()`; it's
generally not useful info other then for granular race condition eval
when hacking the runtime.
So when `is_started_send_side is True` we raise the newly created
`MsgTypeError` (MTE) directly instead of doing all the `Error`-msg pack
and unpack to raise stuff via `_raise_from_unexpected_msg()` since the
raise should happen send side anyway and so doesn't emulate any remote
fault like in a bad `Return` or `Started` without send-side pld-spec
validation.
Oh, and proxy-through the `hide_tb: bool` input from `.drain_to_final_msg()`
to `.recv_msg_w_pld()`.
By calling `Context._maybe_cancel_and_set_remote_error(exc)` on any
unpacked `Error` msg; provides for `Context.maybe_error` consistency to
match all other error delivery cases.
Filling out the helper `validate_payload_msg()` staged in a prior commit
and adjusting all imports to match.
Also add a `raise_mte: bool` flag for potential usage where the caller
wants to handle the MTE instance themselves.
Expecting `Started` or `Return` with respective bad `.pld` values
depending on what type of failure is test parametrized.
This makes the suite run green it seems B)
The `TypeAlias` for the msg type-group is now `MsgType` and any user
touching shuttle messages can now be typed as `PayloadMsg`.
Relatedly, add MTE specific `Error._bad_msg[_as_dict]` fields which are
handy for introspection of remote decode failures.
Such that if caught by user code and/or the runtime we can introspect
the original msg which caused the type error. Previously this was kinda
half-baked with a `.msg_dict` which was delivered from an `Any`-decode
of the shuttle msg in `_mk_msg_type_err()` but now this more explicitly
refines the API and supports both `PayloadMsg`-instance or the msg-dict
style injection:
- allow passing either of `bad_msg: PayloadMsg|None` or
`bad_msg_as_dict: dict|None` to `MsgTypeError.from_decode()`.
- expose public props for both ^ whilst dropping prior `.msgdict`.
- rework `.from_decode()` to explicitly accept `**extra_msgdata: dict`
|_ only overriding it from any `bad_msg_as_dict` if the keys are found in
`_ipcmsg_keys`, **except** for `_bad_msg` when `bad_msg` is passed.
|_ drop `.ipc_msg` passthrough.
|_ drop `msgdict` input.
- adjust `.cid` to only pull from the `.bad_msg` if set.
Related fixes/adjustments:
- `pack_from_raise()` should pull `boxed_type_str` from
`boxed_type.__name__`, not the `type()` of it.. also add a
`hide_tb: bool` flag.
- don't include `_msg_dict` and `_bad_msg` in the `_body_fields` set.
- allow more granular boxed traceback-str controls:
|_ allow passing a `tb_str: str` explicitly in which case we use it
verbatim and presume caller knows what they're doing.
|_ when not provided, use the more explicit
`traceback.format_exception(exc)` since the error instance is
a required input (we still fail back to the old `.format_exc()` call
if for some reason the caller passes `None`; but that should be
a bug right?).
|_ if a `tb: TracebackType` and a `tb_str` is passed, concat them.
- in `RemoteActorError.pformat()` don't indent the `._message` part used
for the `body` when `with_type_header == False`.
- update `_mk_msg_type_err()` to use `bad_msg`/`bad_msg_as_dict`
appropriately and drop passing `ipc_msg`.
In the sense that we handle it as a special case that exposed
through to `RxPld.dec_msg()` with a new `is_started_send_side: bool`.
(Non-ideal) `Context.started()` impl deats:
- only do send-side pld-spec validation when a new `validate_pld_spec`
is set (by default it's not).
- call `self.pld_rx.dec_msg(is_started_send_side=True)` to validate the
payload field from the just codec-ed `Started` msg's `msg_bytes` by
passing the `roundtripped` msg (with it's `.pld: Raw`) directly.
- add a `hide_tb: bool` param and proxy it to the `.dec_msg()` call.
(Non-ideal) `PldRx.dec_msg()` impl deats:
- for now we're packing the MTE inside an `Error` via a manual call to
`pack_error()` and then setting that as the `msg` passed to
`_raise_from_unexpected_msg()` (though really we should just raise
inline?).
- manually set the `MsgTypeError._ipc_msg` to the above..
Other,
- more comprehensive `Context` type doc string.
- various `hide_tb: bool` kwarg additions through `._ops.PldRx` meths.
- proto a `.msg._ops.validate_payload_msg()` helper planned to get the
logic from this version of `.started()`'s send-side validation so as
to be useful more generally elsewhere.. (like for raising back
`Return` values on the child side?).
Warning: this commit may have been made out of order from required
changes to `._exceptions` which will come in a follow up!
Starts with some very basic cases:
- verify both subactor-as-child-ctx-task send side validation (failures)
as well as relay and raise on root-parent-side-task.
- wrap failure expectation cases that bubble out of `@acm`s with
a `maybe_expect_raises()` equiv wrapper with an embedded timeout.
- add `Return` cases including invalid by `str` and valid by a `None`.
Still ToDo:
- commit impl changes to make the bulk of this suite pass.
- adjust how `MsgTypeError`s format the local (`.started()`) send side
`.tb_str` such that we don't do a "boxed" error prior to
`pack_error()` being called normally prior to `Error` transit.
Related to the prior patch, re the new `with_type_header: bool`:
- in the `with_type_header == True` use case make sure we keep the first
`._message: str` line non-indented since it'll show just after the
header-line's type path with ':'.
- when `False` drop the `)>` `repr()`-instance style as well so that we
just get the ascii boxed traceback as though it's the error
message-`str` not the `repr()` of the error obj.
Other,
- hide `pack_from_raise()` call frame since it'll show in debug mode
crash handling..
- mk `MsgTypeError.from_decode()` explicitly accept and proxy an
optional `ipc_msg` and change `msgdict` to also be optional, only
reading out the `**extra_msgdata` when provided.
- expose a `_mk_msg_type_err(src_err_msg: Error|None = None,)` for
callers who which to inject a `._ipc_msg: Msgtype` to the MTE.
|_ add a note how we can't use it due to a causality-dilemma when pld
validating `Started` on the send side..
And IFF the `await wait_func(proc)` is cancelled such that we avoid
clobbering some subactor that might be REPL-ing even though its parent
actor is in the midst of (gracefully) cancelling it.
From both `open_root_actor()` and `._entry._trio_main()`.
Other `breakpoint()`-from-sync-func fixes:
- properly disable the default hook using `"0"` XD
- offer a `hide_tb: bool` from `open_root_actor()`.
- disable hiding the `._trio_main()` frame, bc pretty sure it doesn't
help anyone (either way) when REPL-ing/tb-ing from a subactor..?
Mostly the result of the `RemoteActorError.pformat()` and our
new `_pause/crash_msg: str`s which include the `trio.Task.__repr__()`
in the `log.pdb()` message.
Obvi use the `in_prompt_msg()` to accomplish where not used prior.
ToDo later:
-[ ] still some outstanding questions on how detailed inceptions
should look, eg. in `test_multi_nested_subactors_error_through_nurseries()`
|_maybe we should be more pedantic at checking `.src_uid` vs.
`.relay_uid` fields?
-[ ] staged a placeholder test for verifying correct call-stack frame on
crash handler REPL entry.
-[ ] also need a test to verify that you can't pause from an already paused actor task
such as can happen if you try to step through runtime code that has
a recurrent entry to `._debug.pause()`.
Call it `hide_runtime_frames()` and stick all the lines from the top of
the `._debug` mod in there along with a little `log.devx()` emission on
what gets hidden by default ;)
Other,
- fix ref-error where internal-error handler might trigger despite the
debug `req_ctx` not yet having init-ed, such that we don't try to
cancel or log about it when it never was fully created/initialize..
- fix assignment typo iniside `_set_trace()` for `task`.. lel
Such that when displaying with `.__str__()` we do not show the type
header (style) since normally python's raising machinery already prints
the type path like `'tractor._exceptions.RemoteActorError:'`, so doing
it 2x is a bit ugly ;p
In support,
- include `.relay_uid` in `RemoteActorError.extra_body_fields`.
- offer a `with_type_header: bool` to `.pformat()` and only put the
opening type path and closing `')>'` tail line when `True`.
- add `.is_inception() -> bool:` for an easy way to determine if the
error is multi-hop relayed.
- only repr the `'|_relay_uid=<uid>'` field when an error is an inception.
- tweak the invalid-payload case in `_mk_msg_type_err()` to explicitly
state in the `message` how the `any_pld` value does not match the `MsgDec.pld_spec`
by decoding the invalid `.pld` with an any-dec.
- allow `_mk_msg_type_err(**mte_kwargs)` passthrough.
- pass `boxed_type=cls` inside `MsgTypeError.from_decode()`.
More or less by pedantically separating and managing root and subactor
request syncing events to always be managed by the locking IPC context
task-funcs:
- for the root's "child"-side, `lock_tty_for_child()` directly creates
and sets a new `Lock.req_handler_finished` inside a `finally:`
- for the sub's "parent"-side, `request_root_stdio_lock()` does the same
with a new `DebugStatus.req_finished` event and separates it from
the `.repl_release` event (which indicates a "c" or "q" from user and
thus exit of the REPL session) as well as sets a new `.req_task:
trio.Task` to explicitly distinguish from the app-user-task that
enters the REPL vs. the paired bg task used to request the global
root's stdio mutex alongside it.
- apply the `__pld_spec__` on "child"-side of the ctx using the new
`Portal.open_context(pld_spec)` parameter support; drops use of any
`ContextVar` malarky used prior for `PldRx` mgmt.
- removing `Lock.no_remote_has_tty` since it was a nebulous name and
from the prior "everything is in a `Lock`" design..
------ - ------
More rigorous impl to handle various edge cases in `._pause()`:
- rejig `_enter_repl_sync()` to wrap the `debug_func == None` case
inside maybe-internal-error handler blocks.
- better logic for recurrent vs. multi-task contention for REPL entry in
subactors, by guarding using `DebugStatus.req_task` and by now waiting
on the new `DebugStatus.req_finished` for the multi-task contention
case.
- even better internal error handling and reporting for when this code
is hacked on and possibly broken ;p
------ - ------
Updates to `.pause_from_sync()` support:
- add optional `actor`, `task` kwargs to `_set_trace()` to allow
compat with the new explicit `debug_func` calling in `._pause()` and
pass a `threading.Thread` for `task` in the `.to_thread()` usage case.
- add an `except` block that tries to show the frame on any internal
error.
------ - ------
Relatedly includes a buncha cleanups/simplifications somewhat in
prep for some coming refinements (around `DebugStatus`):
- use all the new attrs mentioned above as needed in the SIGINT shielder.
- wait on `Lock.req_handler_finished` in `maybe_wait_for_debugger()`.
- dropping a ton of masked legacy code left in during the recent reworks.
- better comments, like on the use of `Context._scope` for shielding on
the "child"-side to avoid the need to manage yet another cs.
- add/change-to lotsa `log.devx()` level emissions for those infos which
are handy while hacking on the debugger but not ideal/necessary to be
user visible.
- obvi add lotsa follow up todo notes!
Much like other recent changes attempt to detect runtime-bug-causing
crashes and only show the runtime-endpoint frame when present.
Adds a `ActorNursery._scope_error: BaseException|None` attr to aid with
detection. Also toss in some todo notes for removing and replacing the
`.run_in_actor()` method API.
Just inside `._invoke()` after the `ctx: Context` is retrieved.
Also try our best to *not hide* internal frames when a non-user-code
crash happens, normally either due to a runtime RPC EP bug or
a transport failure.
Since the state mgmt becomes quite messy with multiple sub-tasks inside
an IPC ctx, AND bc generally speaking the payload-type-spec should map
1-to-1 with the `Context`, it doesn't make a lot of sense to be using
`ContextVar`s to modify the `Context.pld_rx: PldRx` instance.
Instead, always allocate a full instance inside `mk_context()` with the
default `.pld_rx: PldRx` set to use the `msg._ops._def_any_pldec: MsgDec`
In support, simplify the `.msg._ops` impl and APIs:
- drop `_ctxvar_PldRx`, `_def_pld_rx` and `current_pldrx()`.
- rename `PldRx._pldec` -> `._pld_dec`.
- rename the unused `PldRx.apply_to_ipc()` -> `.wraps_ipc()`.
- add a required `PldRx._ctx: Context` attr since it is needed
internally in some meths and each pld-rx now maps to a specific ctx.
- modify all recv methods to accept a `ipc: Context|MsgStream` (instead
of a `ctx` arg) since both have a ref to the same `._rx_chan` and there
are only a couple spots (in `.dec_msg()`) where we need the `ctx`
explicitly (which can now be easily accessed via a new `MsgStream.ctx`
property, see below).
- always show the `.dec_msg()` frame in tbs if there's a reference error
when calling `_raise_from_unexpected_msg()` in the fallthrough case.
- implement `limit_plds()` as light wrapper around getting the
`current_ipc_ctx()` and mutating its `MsgDec` via
`Context.pld_rx.limit_plds()`.
- add a `maybe_limit_plds()` which just provides an `@acm` equivalent of
`limit_plds()` handy for composing in a `async with ():` style block
(avoiding additional indent levels in the body of async funcs).
Obvi extend the `Context` and `MsgStream` interfaces as needed
to match the above:
- add a `Context.pld_rx` pub prop.
- new private refs to `Context._started_msg: Started` and
a `._started_pld` (mostly for internal debugging / testing / logging)
and set inside `.open_context()` immediately after the syncing phase.
- a `Context.has_outcome() -> bool:` predicate which can be used to more
easily determine if the ctx errored or has a final result.
- pub props for `MsgStream.ctx: Context` and `.chan: Channel` providing
full `ipc`-arg compat with the `PldRx` method signatures.
Finally got this working so that if/when an internal bug is introduced
to this request task-func, we can actually REPL-debug the lock request
task itself B)
As in, if the subactor's lock request task internally errors we,
- ensure the task always terminates (by calling `DebugStatus.release()`)
and explicitly reports (via a `log.exception()`) the internal error.
- capture the error instance and set as a new `DebugStatus.req_err` and
always check for it on final teardown - in which case we also,
- ensure it's reraised from a new `DebugRequestError`.
- unhide the stack frames for `_pause()`, `_enter_repl_sync()` so that
the dev can upward inspect the `_pause()` call stack sanely.
Supporting internal impl changes,
- add `DebugStatus.cancel()` and `.req_err`.
- don't ever cancel the request task from
`PdbREPL.set_[continue/quit]()` only when there's some internal error
that would likely result in a hang and stale lock state with the root.
- only release the root's lock when the current ask is also the owner
(avoids bad release errors).
- also show internal `._pause()`-related frames on any `repl_err`.
Other temp-dev-tweaks,
- make pld-dec change log msgs info level again while solving this
final context-vars race stuff..
- drop the debug pld-dec instance match asserts for now since
the problem is already caught (and now debug-able B) by an attr-error
on the decoded-as-`dict` started msg, and instead add in
a `log.exception()` trace to see which task is triggering the case
where the debug `MsgDec` isn't set correctly vs. when we think it's
being applied.
Since obviously the thread is likely expected to halt and raise after
the REPL session exits; this was a regression from the prior impl. The
main reason for this is that otherwise the request task will never
unblock if the user steps through the crashed task using 'next' since
the `.do_next()` handler doesn't by default release the request since in
the `.pause()` case this would end the session too early.
Other,
- toss in draft `Pdb.user_exception()`, though doesn't seem to ever
trigger?
- only release `Lock._debug_lock` when already locked.
Mostly adjustments for the new pld-receiver semantics/shim-layer which
results more often in the direct delivery of `RemoteActorError`s from
IPC API primitives (like `Portal.result()`) instead of being embedded in
an `ExceptionGroup` bundled from an embedded nursery.
Tossed usage of the `debug_mode: bool` fixture to a couple problematic
tests while i was working on them.
Also includes detailed assertion updates to the inter-peer cancellation
suite in terms of,
- `Context.canceller` state correctly matching the true src actor when
expecting a ctxc.
- any rxed `ContextCancelled` should instance match the `Context._local/remote_error`
as should the `.msgdata` and `._ipc_msg`.
- start tossing in `__tracebackhide__`s to various eps which don't need
to show in tbs or in the pdb REPL.
- port final `._maybe_enter_pm()` to pass a `api_frame`.
- start comment-marking up some API eps with `@api_frame`
in prep for actually using the new frame-stack tracing.
Woops, due to a `None` test against the `._final_result`, any actual
final `None` result would be received but not acked as such causing
a spawning test to hang. Fix it by instead receiving and assigning both
a `._final_result_msg: PayloadMsg` and `._final_result_pld`.
NB: as mentioned in many recent comments surrounding this API layer,
really this whole `Portal`-has-final-result interface/semantics should
be entirely removed as should the `ActorNursery.run_in_actor()` API(s).
Instead it should all be replaced by a wrapping "high level" API
(`tractor.hilevel` ?) which combines a task nursery, `Portal.open_context()`
and underlying `Context` APIs + an `outcome.Outcome` to accomplish the
same "run a single task in a spawned actor and return it's result"; aka
a "one-shot-task-actor".
- inside the `Actor.cancel()`'s maybe-wait-on-debugger delay,
report the full debug request status and it's affiliated lock request
IPC ctx.
- use the new `.req_ctx.chan.uid` to do the local nursery lookup during
channel teardown handling.
- another couple log fmt tweaks.
Proto-ing a little suite of call-stack-frame annotation-for-scanning
sub-systems for the purposes of both,
- the `.devx._debug`er and its
traceback and frame introspection needs when entering the REPL,
- detailed trace-style logging such that we can explicitly report
on "which and where" `tractor`'s APIs are used in the "app" code.
Deats:
- change mod name obvi from `._code` and adjust client mod imports.
- using `wrapt` (for perf) implement a `@api_frame` annot decorator
which both stashes per-call-stack-frame instances of `CallerInfo` in
a table and marks the function such that API endpoints can be easily
found via runtime stack scanning despite any internal impl changes.
- add a global `_frame2callerinfo_cache: dict[FrameType, CallerInfo]`
table for providing the per func-frame info caching.
- Re-implement `CallerInfo` to require less (types of) inputs:
|_ `_api_func: Callable`, a ref to the (singleton) func def.
|_ `_api_frame: FrameType` taken from the `@api_frame` marked `tractor`-API
func's runtime call-stack, from which we can determine the
app code's `.caller_frame`.
|_`_caller_frames_up: int|None` allowing the specific `@api_frame` to
determine "how many frames up" the application / calling code is.
And, a better set of derived attrs:
|_`caller_frame: FrameType` which finds and caches the API-eps calling
frame.
|_`caller_frame: FrameType` which finds and caches the API-eps calling
- add a new attempt at "getting a method ref from its runtime frame"
with `get_ns_and_func_from_frame()` using a heuristic that the
`CodeType.co_qualname: str` should have a "." in it for methods.
- main issue is still that the func-ref lookup will require searching
for the method's instance type by name, and that name isn't
guaranteed to be defined in any particular ns..
|_rn we try to read it from the `FrameType.f_locals` but that is
going to obvi fail any time the method is called in a module where
it's type is not also defined/imported.
- returns both the ns and the func ref FYI.
- set `._state._ctxvar_Context` just after `StartAck` inside
`open_context_from_portal()` so that `current_ipc_ctx()` always
works on the 'parent' side.
- always set `.canceller` to any `MsgTypeError.src_uid` and otherwise to
any maybe-detected `.src_uid` (i.e. for RAEs).
- always set `.canceller` to us when we rx a ctxc which reports us as
its canceller; this is a sanity check on definite "self cancellation".
- adjust `._is_self_cancelled()` logic to only be `True` when
`._remote_error` is both a ctxc with a `.canceller` set to us AND
when `Context.canceller` is also set to us (since the change above)
as a little bit of extra rigor.
- fill-in/fix some `.repr_state` edge cases:
- merge self-vs.-peer ctxc cases to one block and distinguish via
nested `._is_self_cancelled()` check.
- set 'errored' for all exception matched cases despite `.canceller`.
- add pre-`Return` phase statuses:
|_'pre-started' and 'syncing-to-child' depending on side and when
`._stream` has not (yet) been set.
|_'streaming' and 'streaming-finished' depending on side when
`._stream` is set and whether it was stopped/closed.
- tweak drainage log-message to use "outcome" instead of "result".
- use new `.devx.pformat.pformat_cs()` inside `_maybe_cancel_and_set_remote_error()`
but, IFF the log level is at least 'cancel'.
Since i was running into them (internal errors) during lock request
machinery dev and was getting all sorts of difficult to understand hangs
whenever i intro-ed a bug to either side of the ipc ctx; this all while
trying to get the msg-spec working for `Lock` requesting subactors..
Deats:
- hideframes for `@acm`s and `trio.Event.wait()`, `Lock.release()`.
- better detail out the `Lock.acquire/release()` impls
- drop `Lock.remote_task_in_debug`, use new `.ctx_in_debug`.
- add a `Lock.release(force: bool)`.
- move most of what was `_acquire_debug_lock_from_root_task()` and some
of the `lock_tty_for_child().__a[enter/exit]()` logic into
`Lock.[acquire/release]()` including bunch more logging.
- move `lock_tty_for_child()` up in the module to below `Lock`, with
some rework:
- drop `subactor_uid: tuple` arg since we can just use the `ctx`..
- add exception handler blocks for reporting internal (impl) errors
and always force release the lock in such cases.
- extend `DebugStatus` (prolly will rename to `DebugRequest` btw):
- add `.req_ctx: Context` for subactor side.
- add `.req_finished: trio.Event` to sub to signal request task exit.
- extend `.shield_sigint()` doc-str.
- add `.release()` to encaps all the state mgmt previously strewn
about inside `._pause()`..
- use new `DebugStatus.release()` to replace all the duplication:
- inside `PdbREPL.set_[continue/quit]()`.
- inside `._pause()` for the subactor branch on internal
repl-invocation error cases,
- in the `_enter_repl_sync()` closure on error,
- replace `apply_debug_codec()` -> `apply_debug_pldec()` in tandem with
the new `PldRx` sub-sys which handles the new `__pld_spec__`.
- add a new `pformat_cs()` helper orig to help debug cs stack
a corruption; going to move to `.devx.pformat` obvi.
- rename `wait_for_parent_stdin_hijack()` -> `request_root_stdio_lock()`
with improvements:
- better doc-str and add todos,
- use `DebugStatus` more stringently to encaps all subactor req state.
- error handling blocks for cancellation and straight up impl errors
directly around the `.open_context()` block with the latter doing
a `ctx.cancel()` to avoid hanging in the shielded `.req_cs` scope.
- similar exc blocks for the func's overall body with explicit
`log.exception()` reporting.
- only set the new `DebugStatus.req_finished: trio.Event` in `finally`.
- rename `mk_mpdb()` -> `mk_pdb()` and don't cal `.shield_sigint()`
implicitly since the caller usage does matter for this.
- factor out `any_connected_locker_child()` from the SIGINT handler.
- rework SIGINT handler to better handle any stale-lock/hang cases:
- use new `Lock.ctx_in_debug: Context` to detect subactor-in-debug.
and use it to cancel any lock request instead of the lower level
- use `problem: str` summary approach to log emissions.
- rework `_pause()` given all of the above, stuff not yet mentioned:
- don't take `shield: bool` input and proxy to `debug_func()` (for now).
- drop `extra_frames_up_when_async: int` usage, expect
`**debug_func_kwargs` to passthrough an `api_frame: Frametype` (more
on this later).
- lotsa asserts around the request ctx vs. task-in-debug ctx using new
`current_ipc_ctx()`.
- asserts around `DebugStatus` state.
- rework and simplify the `debug_func` hooks,
`_set_trace()`/`_post_mortem()`:
- make them accept a non-optional `repl: PdbRepl` and `api_frame:
FrameType` which should be used to set the current frame when the
REPL engages.
- always hide the hook frames.
- always accept a `tb: TracebackType` to `_post_mortem()`.
|_ copy and re-impl what was the delegation to
`pdbp.xpm()`/`pdbp.post_mortem()` and instead call the
underlying `Pdb.interaction()` ourselves with a `caller_frame`
and tb instance.
- adjust the public `.pause()` impl:
- accept optional `hide_tb` and `api_frame` inputs.
- mask opening a cancel-scope for now (can cause `trio` stack
corruption, see notes) and thus don't use the `shield` input other
then to eventually passthrough to `_post_mortem()`?
|_ thus drop `task_status` support for now as well.
|_ pretty sure correct soln is a debug-nursery around `._invoke()`.
- since no longer using `extra_frames_up_when_async` inside
`debug_func()`s ensure all public apis pass a `api_frame`.
- re-impl our `tractor.post_mortem()` to directly call into `._pause()`
instead of binding in via `partial` and mk it take similar input as
`.pause()`.
- drop `Lock.release()` from `_maybe_enter_pm()`, expose and pass
expected frame and tb.
- use necessary changes from all the above within
`maybe_wait_for_debugger()` and `acquire_debug_lock()`.
Lel, sorry thought that would be shorter..
There's still a lot more re-org to do particularly with `DebugStatus`
encapsulation but it's coming in follow up.
Since we need to allow it (at the least) inside
`drain_until_final_msg()` for handling stream-phase termination races
where we don't want to have to handle a raised error from something like
`Context.result()`. Expose the passthrough option via
a `passthrough_non_pld_msgs: bool` kwarg.
Add comprehensive comment to `current_pldrx()`.
Expose it from `._state.current_ipc_ctx()` and set it inside
`._rpc._invoke()` for child and inside `Portal.open_context()` for
parent.
Still need to write a few more tests (particularly demonstrating usage
throughout multiple nested nurseries on each side) but this suffices as
a proto for testing with some debugger request-from-subactor stuff.
Other,
- use new `.devx.pformat.add_div()` for ctxc messages.
- add a block to always traceback dump on corrupted cs stacks.
- better handle non-RAEs exception output-formatting in context
termination summary log message.
- use a summary for `start_status` for msg logging in RPC loop.
Since we usually want them raised from some (internal) call to
`Context.maybe_raise()` and NOT directly from the drainage call, make it
possible via a new `raise_error: bool` to both `PldRx.recv_msg_w_pld()`
and `.dec_msg()`.
In support,
- rename `return_msg` -> `result_msg` since we expect to return
`Error`s.
- do a `result_msg` assign and `break` in the `case Error()`.
- add `**dec_msg_kwargs` passthrough for other `.dec_msg()` calling
methods.
Other,
- drop/aggregate todo-notes around the main loop's
`ctx._pld_rx.recv_msg_w_pld()` call.
- add (configurable) frame hiding to most payload receive meths.
Since `._code` is prolly gonna get renamed (to something "frame & stack
tools" related) and to give a bit better organization.
Also adds a new `add_div()` helper, factored out of ctxc message
creation in `._rpc._invoke()`, for adding a little "header line" divider
under a given `message: str` with a little math to center it.
For more sane manual calls as needed in logging purposes. Obvi remap
the dunder methods to it.
Other:
- drop `hide_tb: bool` from `unpack_error()`, shouldn't need it since
frame won't ever be part of any tb raised from returned error.
- add a `is_invalid_payload: bool` to `_raise_from_unexpected_msg()` to
be used from `PldRx` where we don't need to decode the IPC
msg, just the payload; make the error message reflect this case.
- drop commented `._portal._unwrap_msg()` since we've replaced it with
`PldRx`'s delegation to newer `._raise_from_unexpected_msg()`.
- hide the `Portal.result()` frame by default, again.
A better spot for the pretty-formatting of frame text (and thus tracebacks)
is in the new `.devx._code` module:
- move from `._exceptions` -> `.devx._code.pformat_boxed_tb()`.
- add new `pformat_caller_frame()` factored out the use case in
`._exceptions._mk_msg_type_err()` where we dump a stack trace
for bad `.send()` side IPC msgs.
Add some new pretty-format methods to `Context`:
- explicitly implement `.pformat()` and allow an `extra_fields: dict`
which can be used to inject additional fields (maybe eventually by
default) such as is now used inside
`._maybe_cancel_and_set_remote_error()` when reporting the internal
`._scope` state in cancel logging.
- add a new `.repr_state -> str` which provides a single string status
depending on the internal state of the IPC ctx in terms of the shuttle
protocol's "phase"; use it from `.pformat()` for the `|_state:`.
- set `.started(complain_no_parity=False)` now since we presume decoding
with `.pld: Raw` now with the new `PldRx` design.
- use new `msgops.current_pldrx()` in `mk_context()`.
Not sure it's **that** useful (yet) but in theory would allow avoiding
certain log level usage around transient RPC requests for discovery methods
(like `.register_actor()` and friends); can't hurt to be able to
introspect that last message for other future cases I'd imagine as well.
Adjust the calling code in `._runtime` to match; other spots are using
the `trio.Nursery.start()` schedule style and are fine as is.
Improve a bunch more log messages throughout a few mods mostly by going
to a "summary" single-emission style where possible/appropriate:
- in `._runtime` more "single summary" status style log emissions:
|_mk `Actor.load_modules()` render a single mod loaded summary.
|_use a summary `con_status: str` for `Actor._stream_handler()` conn
setup and an equiv (`con_teardown_status`) for connection teardowns.
|_similar thing in `Actor.wait_for_actor()`.
- generally more usage of `.msg.pretty_struct` apis throughout `._runtime`.
Add new task-scope oriented `PldRx.pld_spec` management API similar to
`.msg._codec.limit_msg_spec()`, but obvi built to process and filter
`MsgType.pld` values.
New API related changes include:
- new per-task singleton getter `msg._ops.current_pldrx()` which
delivers the current (global) payload receiver via a new
`_ctxvar_PldRx: ContextVar` configured with a default
`_def_any_pldec: MsgDec[Any]` decoder.
- a `PldRx.limit_plds()` which sets the decoder (`.type` underneath)
for the specific payload rx instance.
- `.msg._ops.limit_plds()` which obtains the current task-scoped `PldRx`
and applies the pld spec via a new `PldRx.limit_plds()`.
- rename `PldRx._msgdec` -> `._pldec`.
- add `.pld_dec` as pub attr for -^
Unrelated adjustments:
- use `.msg.pretty_struct.pformat()` where handy.
- always pass `expect_msg: MsgType`.
- add a `case Stop()` to `PldRx.dec_msg()` which will `log.warning()`
when a stop is received by no stream was open on this receiving side
since we rarely want that to raise since it's prolly just a runtime
race or mistake in user code.
Other:
Particularly when logging around `MsgTypeError`s.
Other:
- make `_raise_from_unexpected_msg()`'s `expect_msg` a non-default value
arg, must always be passed by caller.
- drop `'canceller'` from `_body_fields` ow it shows up twice for ctxc.
- use `.msg.pretty_struct.pformat()`.
- parameterize `RemoteActorError.reprol()` (repr-one-line method) to
show `RemoteActorError[<self.boxed_type_str>]( ..` to make obvi
the boxed remote error type.
- re-impl `.boxed_type_str` as `str`-casting the `.boxed_type` value
which is guaranteed to render non-`None`.
Basically exact same as that for `MsgCodec` with the `.spec` displayed
via a better (maybe multi-line) `.spec_str: str` generated from a common
new set of helper mod funcs factored out msg-codec meths:
- `mk_msgspec_table()` to gen a `MsgType` name -> msg table.
- `pformat_msgspec()` to `str`-ify said table values nicely.q
Also add a new `MsgCodec.msg_spec_str: str` prop which delegates to the
above for the same.
- tweaking logging to include more `MsgType` dumps on IPC faults.
- removing some commented cruft.
- comment formatting / cleanups / add-ons.
- more type annots.
- fill out some TODO content.
As per the reco:
https://jcristharif.com/msgspec/perf-tips.html#reusing-an-output-buffe
BUT, seems to cause this error in `pikerd`..
`BufferError: Existing exports of data: object cannot be re-sized`
Soo no idea? Maybe there's a tweak needed that we can glean from
tests/examples in the `msgspec` repo?
Disabling for now.
Instead of expecting it to be passed in (as it was prior), when
determining if a `Stop` msg is a valid end-of-channel signal use the
`ctx._stream: MsgStream|None` attr which **must** be set by any stream
opening API; either of:
- `Context.open_stream()`
- `Portal.open_stream_from()`
Adjust the case block logic to match with fallthrough from any EoC to
a closed error if necessary. Change the `_type: str` to match the
failing IPC-prim name in the tail case we raise a `MessagingError`.
Other:
- move `.sender: tuple` uid attr up to `RemoteActorError` since `Error`
optionally defines it as a field and for boxed `StreamOverrun`s (an
ignore case we check for in the runtime during cancellation) we want
it readable from the boxing rae.
- drop still unused `InternalActorError`.
As per much tinkering, re-designs and preceding rubber-ducking via many
"commit msg novelas", **finally** this adds the (hopefully) final
missing layer for typed msg safety: `tractor.msg._ops.PldRx`
(or `PayloadReceiver`? haven't decided how verbose to go..)
Design justification summary:
------ - ------
- need a way to be as-close-as-possible to the `tractor`-application
such that when `MsgType.pld: PayloadT` validation takes place, it is
straightforward and obvious how user code can decide to handle any
resulting `MsgTypeError`.
- there should be a common and optional-yet-modular way to modify
**how** data delivered via IPC (possibly embedded as user defined,
type-constrained `.pld: msgspec.Struct`s) can be handled and processed
during fault conditions and/or IPC "msg attacks".
- support for nested type constraints within a `MsgType.pld` field
should be simple to define, implement and understand at runtime.
- a layer between the app-level IPC primitive APIs
(`Context`/`MsgStream`) and application-task code (consumer code of
those APIs) should be easily customized and prove-to-be-as-such
through demonstrably rigorous internal (sub-sys) use!
-> eg. via seemless runtime RPC eps support like `Actor.cancel()`
-> by correctly implementing our `.devx._debug.Lock` REPL TTY mgmt
dialog prot, via a dead simple payload-as-ctl-msg-spec.
There are some fairly detailed doc strings included so I won't duplicate
that content, the majority of the work here is actually somewhat of
a factoring of many similar blocks that are doing more or less the same
`msg = await Context._rx_chan.receive()` with boilerplate for
`Error`/`Stop` handling via `_raise_from_no_key_in_msg()`. The new
`PldRx` basically provides a shim layer for this common "receive msg,
decode its payload, yield it up to the consuming app task" by pairing
the RPC feeder mem-chan with a msg-payload decoder and expecting IPC API
internals to use **one** API instead of re-implementing the same pattern
all over the place XD
`PldRx` breakdown
------ - ------
- for now only expects a `._msgdec: MsgDec` which allows for
override-able `MsgType.pld` validation and most obviously used in
the impl of `.dec_msg()`, the decode message method.
- provides multiple mem-chan receive options including:
|_ `.recv_pld()` which does the e2e operation of receiving a payload
item.
|_ a sync `.recv_pld_nowait()` version.
|_ a `.recv_msg_w_pld()` which optionally allows retreiving both the
shuttling `MsgType` as well as it's `.pld` body for use cases where
info on both is important (eg. draining a `MsgStream`).
Dirty internal changeover/implementation deatz:
------ - ------
- obvi move over all the IPC "primitives" that previously had the duplicate recv-n-yield
logic:
- `MsgStream.receive[_nowait]()` delegating instead to the equivalent
`PldRx.recv_pld[_nowait]()`.
- add `Context._pld_rx: PldRx`, created and passed in by
`mk_context()`; use it for the `.started()` -> `first: Started`
retrieval inside `open_context_from_portal()`.
- all the relevant `Portal` invocation methods: `.result()`,
`.run_from_ns()`, `.run()`; also allows for dropping `_unwrap_msg()`
and `.Portal_return_once()` outright Bo
- rename `Context.ctx._recv_chan` -> `._rx_chan`.
- add detailed `Context._scope` info for logging whether or not it's
cancelled inside `_maybe_cancel_and_set_remote_error()`.
- move `._context._drain_to_final_msg()` -> `._ops.drain_to_final_msg()`
since it's really not necessarily ctx specific per say, and it does
kinda fit with "msg operations" more abstractly ;)
In prep for a "payload receiver" abstraction that will wrap
`MsgType.pld`-IO delivery from `Context` and `MsgStream`, adds a small
`msgspec.msgpack.Decoder` shim which delegates an API similar to
`MsgCodec` and is offered via a `.msg._codec.mk_dec()` factory.
Detalles:
- move over the TODOs/comments from `.msg.types.Start` to to
`MsgDec.spec` since it's probably the ideal spot to start thinking
about it from a consumer code PoV.
- move codec reversion assert and log emit into `finally:` block.
- flip default `.types._tractor_codec = mk_codec_ipc_pld(ipc_pld_spec=Raw)`
in prep for always doing payload-delayed decodes.
- make `MsgCodec._dec` private with public property getter.
- change `CancelAck` to NOT derive from `Return` so it's mutex in
`match/case:` handling.
Since it's going to be used from the IPC primitive APIs
(`Context`/`MsgStream`) for similarly handling payload type spec
validation errors and bc it's really not well situation in the IPC
module XD
Summary of (impl) tweaks:
- obvi move `_mk_msg_type_err()` and import and use it in `._ipc`; ends
up avoiding a lot of ad-hoc imports we had from `._exceptions` anyway!
- mask out "new codec" runtime log emission from `MsgpackTCPStream`.
- allow passing a (coming in next commit) `codec: MsgDec` (message
decoder) which supports the same required `.pld_spec_str: str` attr.
- for send side logging use existing `MsgCodec..pformat_msg_spec()`.
- rename `_raise_from_no_key_in_msg()` to the now more appropriate
`_raise_from_unexpected_msg()`, but leaving alias for now.
Turns out we do want per-task inheritance particularly if there's to be
per `Context` dynamic mutation of the spec; we don't want mutation in
some task to affect any parent/global setting.
Turns out since we use a common "feeder task" in the rpc loop, we need to
offer a per `Context` payload decoder sys anyway in order to enable
per-task controls for inter-actor multi-task-ctx scenarios.
As per some newly added features and APIs:
- pass `portal: Portal` to `Actor.start_remote_task()` from
`open_context_from_portal()` marking `Portal.open_context()` as
always being the "parent" task side.
- add caller tracing via `.devx._code.CallerInfo/.find_caller_info()`
called in `mk_context()` and (for now) a `__runtimeframe__: int = 2`
inside `open_context_from_portal()` such that any enter-er of
`Portal.open_context()` will be reported.
- pass in a new `._caller_info` attr which is used in 2 new meths:
- `.repr_caller: str` for showing the name of the app-code-func.
- `.repr_api: str` for showing the API ep, which for now we just
hardcode to `Portal.open_context()` since ow its gonna show the mod
func name `open_context_from_portal()`.
- use those new props ^ in the `._deliver_msg()` flow body log msg
content for much clearer msg-flow tracing Bo
- add `Context._cancel_on_msgerr: bool` to toggle whether
a delivered `MsgTypeError` should trigger a `._scope.cancel()` call.
- also (temporarily) add separate `.cancel()` emissions for both cases
as i work through hacking out the maybe `MsgType.pld: Raw` support.
Breaks out all the (sub)actor local conc primitives from `Lock` (which
is now only used in and by the root actor) such that there's an explicit
distinction between a task that's "consuming" the `Lock` (remotely) vs.
the root-side service tasks which do the actual acquire on behalf of the
requesters.
`DebugStatus` changeover deats:
------ - ------
- move all the actor-local vars over `DebugStatus` including:
- move `_trio_handler` and `_orig_sigint_handler`
- `local_task_in_debug` now `repl_task`
- `_debugger_request_cs` now `req_cs`
- `local_pdb_complete` now `repl_release`
- drop all ^ fields from `Lock.repr()` obvi..
- move over the `.[un]shield_sigint()` and
`.is_main_trio_thread()` methods.
- add some new attrs/meths:
- `DebugStatus.repl` for the currently running `Pdb` in-actor
singleton.
- `.repr()` for pprint of state (like `Lock`).
- Note: that even when a root-actor task is in REPL, the `DebugStatus`
is still used for certain actor-local state mgmt, such as SIGINT
handler shielding.
- obvi change all lock-requester code bits to now use a `DebugStatus` in
their local actor-state instead of `Lock`, i.e. change usage from
`Lock` in `._runtime` and `._root`.
- use new `Lock.get_locking_task_cs()` API in when checking for
sub-in-debug from `._runtime.Actor._stream_handler()`.
Unrelated to topic-at-hand tweaks:
------ - ------
- drop the commented bits about hiding `@[a]cm` stack frames from
`_debug.pause()` and simplify to only one block with the `shield`
passthrough since we already solved the issue with cancel-scopes using
`@pdbp.hideframe` B)
- this includes all the extra logging about the extra frame for the
user (good thing i put in that wasted effort back then eh..)
- put the `try/except BaseException` with `log.exception()` around the
whole of `._pause()` to ensure we don't miss in-func errors which can
cause hangs..
- allow passing in `portal: Portal` to
`Actor.start_remote_task()` such that `Portal` task spawning methods
are always denoted correctly in terms of `Context.side`.
- lotsa logging tweaks, decreasing a bit of noise from `.runtime()`s.
Since it's totes possible to have a spec applied that won't permit
`str`s, might as well formalize a small msg set for subactors to request
the tree-wide TTY `Lock`.
BTW, I'm prolly not going into every single change here in this first
WIP since there's still a variety of broken stuff mostly to do with
races on the codec apply being done in a `trio.lowleve.RunVar`; it
should be re-done with a `ContextVar` such that each task does NOT
mutate the global setting..
New msg set and usage is simply:
- `LockStatus` which is the reponse msg delivered from `lock_tty_for_child()`
- `LockRelease` a one-off request msg from the subactor to drop the
`Lock` from a `MsgStream.send()`.
- use these msgs throughout the root and sub sides of the locking
ctx funcs: `lock_tty_for_child()` & `wait_for_parent_stdin_hijack()`
The codec is now applied in both the root and sub `Lock` request tasks:
- for root inside `lock_tty_for_child()` before the `.started()`.
- for subs, inside `wait_for_parent_stdin_hijack()` since we only want
to affect the codec *for the locking task*.
- (hence the need for ctx-var as mentioned above but currently this
can cause races which will break against other app tasks competing
for the codec setting).
- add a `apply_debug_codec()` helper for use in both cases.
- add more detailed logging to both the root and sub side of `Lock`
requesting funcs including requiring that the sub-side task "uid" (a
`tuple[str, int]` = (trio.Task.name, id(trio.Task)` be provided (more
on this later).
A main issue discovered while proto-testing all this was the ability of
a sub to "double lock" (leading to self-deadlock) via an error in
`wait_for_parent_stdin_hijack()` which, for ex., can happen in debug
mode via crash handling of a `MsgTypeError` received from the root
during a codec applied msg-spec race! Originally I was attempting to
solve this by making the SIGINT override handler more resilient but this
case is somewhat impossible to detect by an external root task other
then checking for duplicate ownership via the new `subactor_task_uid`.
=> SO NOW, we always stick the current task uid in the
`Lock._blocked: set` and raise an rte on a double request by the same
remote task.
Included is a variety of small refinements:
- finally figured out how to mark a variety of `.__exit__()` frames with
`pdbp.hideframe()` to actually hide them B)
- add cls methods around managing `Lock._locking_task_cs` from root only.
- re-org all the `Lock` attrs into those only used in root vs. subactors
and proto-prep a new `DebugStatus` actor-singleton to be used in subs.
- add a `Lock.repr()` to contextually print the current conc primitives.
- rename our `Pdb`-subtype to `PdbREPL`.
- rigor out the SIGINT handler a bit, originally to try and hack-solve
the double-lock issue mentioned above, but now just with better
logging and logic for most (all?) possible hang cases that should be
hang-recoverable after enough ctrl-c mashing by the user.. well
hopefully:
- using `Lock.repr()` for both root and sub cases.
- lots more `log.warn()`s and handler reversions on stale lock or cs
detection.
- factor `._pause()` impl a little better moving the actual repl entry
to a new `_enter_repl_sync()` (originally for easier wrapping in the
sub case with `apply_codec()`).
- Drop `test_msg_spec_xor_pld_spec()` since we no longer support
`ipc_msg_spec` arg to `mk_codec()`.
- Expect `MsgTypeError`s around `.open_context()` calls when
`add_codec_hooks == False`.
- toss in some `.pause()` points in the subactor ctx body whilst hacking
out a `.pld` protocol for debug mode TTY locking.
Such that the top level `maybe_enable_greenback` from
`open_root_actor()` can toggle the entire actor tree's usage.
Read the rtv in `._rpc` tasks and only enable if set.
Also, rigor up the `._rpc.process_messages()` loop to handle `Error()`
and `case _:` separately such that we now raise an explicit rte for
unknown / invalid msgs. Use "parent" / "child" for side descriptions in
loop comments and put a fat comment before the `StartAck` in `_invoke()`.
Instead of `allow_msg_keys` since we've fully flipped over to
struct-types for msgs in the runtime.
- drop the loop from `MsgStream.receive_nowait()` since
`Yield/Return.pld` getting will handle both (instead of a loop of
`dict`-key reads).
Which matches with renaming `.payload_msg` -> `.expected_msg` which is
the value we attempt to construct from a vanilla-msgppack
decode-to-`dict` and then construct manually into a `MsgType` using
`.msg.types.from_dict_msg()`. Add a todo to use new `use_pretty` flag
which currently conflicts with `._exceptions.pformat_boxed_type()`
prefix formatting..
Add a bit of special handling for msg-type-errors with a dedicated
log-msg detailing which `.side: str` is the sender/causer and avoiding
a `._scope.cancel()` call in such cases since the local task might be
written to handle and tolerate the badly (typed) IPC msg.
As part of ^, change the ctx task-pair "side" semantics from "caller" ->
"callee" to be "parent" -> "child" which better matches the
cross-process SC-linked-task supervision hierarchy, and
`trio.Nursery.parent_task`; in `trio` the task that opens a nursery is
also named the "parent".
Impl deats / fixes around the `.side` semantics:
- ensure that `._portal: Portal` is set ASAP after
`Actor.start_remote_task()` such that if the `Started` transaction
fails, the parent-vs.-child sides are still denoted correctly (since
`._portal` being set is the predicate for that).
- add a helper func `Context.peer_side(side: str) -> str:` which inverts
from "child" to "parent" and vice versa, useful for logging info.
Other tweaks:
- make `_drain_to_final_msg()` return a tuple of a maybe-`Return` and
the list of other `pre_result_drained: list[MsgType]` such that we
don't ever have to warn about the return msg getting captured as
a pre-"result" msg.
- Add some strictness flags to `.started()` which allow for toggling
whether to error or warn log about mismatching roundtripped `Started`
msgs prior to IPC transit.
Display the new `MsgCodec.pld_spec_str` and format the incorrect field
value to be placed entirely (txt block wise) right of the "type annot"
part of the line:
Iow if you had a bad `dict` value where something else should be it'd
look something like this:
<Started(
|_pld: NamespacePath = {'cid': '3e0ca00c-7d32-4d2a-a0c2-ac2e12453871',
'locked': True,
'msg_type': 'LockStatus',
'subactor_uid': ['sub', 'af7ccb69-1dab-491f-84f7-2ec42c32d137']}
- add some `tb_str: str` indent-prefix args for diff indent levels for the
body vs. the surrounding "ascii box".
- ^-use it-^ from `RemoteActorError.__repr()__` obvi.
- use new `msg.types.from_dict_msg()` in impl of
`MsgTypeError.payload_msg`, handy for showing what the message "would
have looked like in `Struct` form" had it not failed it's type
constraints.
Sure makes console grokability a lot better by showing only the
customizeable fields.
Further, clean up `mk_codec()` a bunch by removing the `ipc_msg_spec`
param since we don't plan to support another msg-set (for now) which
allows cleaning out a buncha logic that was mostly just a source of
bugs..
Also,
- add temporary `log.info()` around codec application.
- throw in some sanity `assert`s to `limit_msg_spec()`.
- add but mask out the `extend_msg_spec()` idea since it seems `msgspec`
won't allow `Decoder.type` extensions when using a custom `dec_hook()`
for some extension type.. (not sure what approach to take here yet).
Handy for re-constructing a struct-`MsgType` from a `dict` decoded from
wire-bytes wherein the msg failed to decode normally due to a field type
error but you'd still like to show the "potential" msg in struct form,
say inside a `MsgTypeError`'s meta data.
Supporting deats:
- add a `.msg.types.from_dict_msg()` to implement it (the helper).
- also a `.msg.types._msg_table: dict[str, MsgType]` for supporting this
func ^ as well as providing just a general `MsgType`-by-`str`-name
lookup.
Unrelated:
- Drop commented idea for still supporting `dict`-msg set via
`enc/dec_hook()`s that would translate to/from `MsgType`s, but that
would require a duplicate impl in the runtime.. so eff that XD
Mostly removing commented (and replaced) code blocks lingering from the
ctxc semantics work and new typed-msg-spec `MsgType`s handling AND use
the new `._exceptions.pack_from_raise()` helper to construct
`StreamOverrun` msgs.
Deaterz:
- clean out the drain loop now that it's implemented to handle our
struct msg types including the `dict`-msg bits left in as
fallback-reminders, any notes/todos better summarized at the top of
their blocks, remove any `_final_result_is_set()` related duplicate/legacy
tidbits.
- use a `case Error()` block in drain loop with fallthrough to `_:`
always resulting in an rte raise.
- move "XXX" notes into the doc-string for `._deliver_msg()` as
a "rules" section.
- use `match:` syntax for logging the `result_or_err: MsgType` outcome
from the final `.result()` call inside `open_context_from_portal()`.
- generally speaking use `MsgType` type annotations throughout!
Such that `Channel.recv()` + `MsgpackTCPStream.recv()` originating
msg-type-errors are not raised at the IPC transport layer but instead
relayed up the runtime stack for eventual handling by user-app code via
the `Context`/`MsgStream` layer APIs.
This design choice leads to a substantial amount of flexibility and
modularity, and avoids `MsgTypeError` handling policies from being
coupled to a particular backend IPC transport layer:
- receive-side msg-type errors, as can be raised and handled in the
`.open_stream()` "nasty" phase of a ctx, whilst being packed at the
`MsgCodec`/transport layer (keeping the underlying src decode error
coupled to the specific transport + interchange lib) and then relayed
upward to app code for custom handling like a normal Error` msg.
- the policy options for handling such cases could be implemented as
`@acm` wrappers around `.open_context()`/`.open_stream()` blocks (and
their respective delivered primitives) OR just plain old async
generators around `MsgStream.receive()` such that both built-in policy
handling and custom user-app solutions can be swapped without touching
any `tractor` internals or providing specialized "registry APIs".
-> eg. the ignore and relay-invalid-msg-to-sender approach can be more
easily implemented as embedded `try: except MsgTypeError:` blocks
around `MsgStream.receive()` possibly applied as either of an
injected wrapper type around a stream or an async gen that `async
for`s from the stream.
- any performance based AOT-lang extensions used to implement a policy
for handling recv-side errors space can avoid knowledge of the lower
level IPC `Channel` (and-downward) primitives.
- `Context` consuming code can choose to let all msg-type-errs
bubble and handle them manually (like any other remote `Error`
shuttled exception).
- we can keep (as before) send-side msg type checks can be raised
locally and cause offending senders to error and adjust before the
streaming phase of an IPC ctx.
Impl (related) deats:
- obvi make `MsgpackTCPStream.recv()` yield up any `MsgTypeError`
constructed by `_mk_msg_type_err()` such that the exception will
eventually be relayed up to `._rpc.process_messages()` and from
their delivered to the corresponding ctx-task.
- in support of ^, make `Channel.recv()` detect said mtes and use the
new `pack_from_raise()` to inject the far end `Actor.uid` for the
`Error.src_uid`.
- keep raising the send side equivalent (when strict enabled) errors
inline immediately with no upward `Error` packing or relay.
- improve `_mk_msg_type_err()` cases handling with far more detailed
`MsgTypeError` "message" contents pertaining to `msgspec` specific
failure-fixing-tips and type-spec mismatch info:
* use `.from_decode()` constructor in recv-side case to inject the
non-spec decoded `msg_dict: dict` and use the new
`MsgCodec.pld_spec_str: str` when clarifying the type discrepancy
with the offending field.
* on send-side, if we detect that an unsupported field type was
described in the original `src_type_error`, AND there is no
`msgpack.Encoder.enc_hook()` set, that the real issue is likely
that the user needs to extend the codec to support the
non-std/custom type with a hook and link to `msgspec` docs.
* if one of a `src_type/validation_error` is provided, set that
error as the `.__cause__` in the new mte.
Make a new `MsgType: TypeAlias` for the union of all msg types such that
it can be used in annots throughout the code base; just make
`.msg.__msg_spec__` delegate to it.
Add some new codec methods:
- `pld_spec_str`: for the `str`-casted value of the payload spec,
generally useful in logging content.
- `msg_spec_items()`: to render a `dict` of msg types to their
`str()`-casted values with support for singling out a specific
`MsgType`, type by input `msg` instance.
- `pformat_msg_spec()`: for rendering the (partial) `.msg_spec` as
a formatted `str` useful in logging.
Oh right, add a `Error._msg_dict: dict` in support of the previous
commit (for `MsgTypeError` packing as RAEs) such that our error msg type
can house a non-type-spec decoded wire-bytes for error
reporting/analysis purposes.
Since in the receive-side error case the source of the exception is the
sender side (normally causing a local `TypeError` at decode time), might
as well bundle the error in remote-capture-style using boxing semantics
around the causing local type error raised from the
`msgspec.msgpack.Decoder.decode()` and with a traceback packed from
`msgspec`-specific knowledge of any field-type spec matching failure.
Deats on new `MsgTypeError` interface:
- includes a `.msg_dict` to get access to any `Decoder.type`-applied
load of the original (underlying and offending) IPC msg into
a `dict` form using a vanilla decoder which is normally packed into
the instance as a `._msg_dict`.
- a public getter to the "supposed offending msg" via `.payload_msg`
which attempts to take the above `.msg_dict` and load it manually into
the corresponding `.msg.types.MsgType` struct.
- a constructor `.from_decode()` to make it simple to build out error
instances from a failed decode scope where the aforementioned
`msgdict: dict` from the vanilla decode can be provided directly.
- ALSO, we now pack into `MsgTypeError` directly just like ctxc in
`unpack_error()`
This also completes the while-standing todo for `RemoteActorError` to
contain a ref to the underlying `Error` msg as `._ipc_msg` with public
`@property` access that `defstruct()`-creates a pretty struct version
via `.ipc_msg`.
Internal tweaks for this include:
- `._ipc_msg` is the internal literal `Error`-msg instance if provided
with `.ipc_msg` the dynamic wrapper as mentioned above.
- `.__init__()` now can still take variable `**extra_msgdata` (similar
to the `dict`-msgdata as before) to maintain support for subtypes
which are constructed manually (not only by `pack_error()`) and insert
their own attrs which get placed in a `._extra_msgdata: dict` if no
`ipc_msg: Error` is provided as input.
- the `.msgdata` is now a merge of any `._extra_msgdata` and
a `dict`-casted form of any `._ipc_msg`.
- adjust all previous `.msgdata` field lookups to try equivalent field
reads on `._ipc_msg: Error`.
- drop default single ws indent from `.tb_str` and do a failover lookup
to `.msgdata` when `._ipc_msg is None` for the manually constructed
subtype-instance case.
- add a new class attr `.extra_body_fields: list[str]` to allow subtypes
to declare attrs they want shown in the `.__repr__()` output, eg.
`ContextCancelled.canceller`, `StreamOverrun.sender` and
`MsgTypeError.payload_msg`.
- ^-rework defaults pertaining to-^ with rename from
`_msgdata_keys` -> `_ipcmsg_keys` with latter now just loading directly
from the `Error` fields def and `_body_fields: list[str]` just taking
that value and removing the not-so-useful-in-REPL or already shown
(i.e. `.tb_str: str`) field names.
- add a new mod level `.pack_from_raise()` helper for auto-boxing RAE
subtypes constructed manually into `Error`s which is normally how
`StreamOverrun` and `MsgTypeError` get created in the runtime.
- in support of the above expose a `src_uid: tuple` override to
`pack_error()` such that the runtime can provide any remote actor id
when packing a locally-created yet remotely-caused RAE subtype.
- adjust all typing to expect `Error`s over `dict`-msgs.
Adjust some tests to match these changes:
- context and inter-peer-cancel tests to make their `.msgdata` related
checks against the new `.ipc_msg` as well and `.tb_str` directly.
- toss in an extra sleep to `sleep_a_bit_then_cancel_peer()` to keep the
'canceller' ctx child task cancelled by it's parent in the 'root' for
the rte-raised-during-ctxc-handling case (apparently now it's
returning too fast, cool?).
Better describes the internal RPC impl/latest-architecture with the msgs
delivered being those which either define a `.pld: PayloadT` that gets
passed up to user code, or the error-msg subset that similarly is raised
in a ctx-linked task.
These are likely temporary changes but still needed to actually see the
desired/correct failures (of which 5 of 6 tests are supposed to fail rn)
mostly to do with `Start` and `Return` msgs which are invalid under each
test's applied msg-spec.
Tweak set here:
- bit more `print()`s in root and sub for grokin test flow.
- never use `pytes.fail()` in subactor.. should know this by now XD
- comment out some bits that can't ever pass rn and make the underlying
expected failues harder to grok:
- the sub's child-side-of-ctx task doing sends should only fail
for certain msg types like `Started` + `Return`, `Yield`s are
processed receiver/parent side.
- don't expect `sent` list to match predicate set for the same reason
as last bullet.
The outstanding msg-type-semantic validation questions are:
- how to handle `.open_context()` with an input `kwargs` set that
doesn't adhere to the currently applied msg-spec?
- should the initial `@acm` entry fail before sending to the child
side?
- where should received `MsgTypeError`s be raised, at the `MsgStream`
`.receive()` or lower in the stack?
- i'm thinking we should mk `MsgTypeError` derive from
`RemoteActorError` and then have it be delivered as an error to the
`Context`/`MsgStream` for per-ctx-task handling; would lead to more
flexible/modular policy overrides in user code outside any defaults
we provide.
Mainly expanding out the runtime endpoints for cancellation to separate
cases and flattening them with the main RPC-request-invoke block, moving
the non-cancel runtime case (where we call `getattr(actor, funcname)`)
inside the main `Start` case (for now) which branches on `ns=="self"`.
Also, add a new IPC msg `class CancelAck(Return):` which is always
included in the default msg-spec such that runtime cancellation (and
eventually all) endpoints return that msg (instead of a `Return`) and
thus sidestep any currently applied `MsgCodec` such that the results
(`bool`s for most cancel methods) are never violating the current type
limit(s) on `Msg.pld`. To support this expose a new variable
`return_msg: Return|CancelAck` param from
`_invoke()`/`_invoke_non_context)()` and set it to `CancelAck` in the
appropriate endpoint case-blocks of the msg loop.
Clean out all the lingering legacy `chan.send(<dict-msg>)` commented
codez from the invoker funcs, with more cleaning likely to come B)
Pretty sure we haven't *needed it* for a while, it was always generally
hazardous in terms of IPC msg types, AND it's definitely incompatible
with a dynamically applied typed msg spec: you can't just expect
a `None` to be willy nilly handled all the time XD
For now I'm masking out all the code and leaving very detailed
surrounding notes but am not removing it quite yet in case for strange
reason it is needed by some edge case (though I haven't found according
to the test suite).
Backstory:
------ - ------
Originally (i'm pretty sure anyway) it was added as a super naive
"remote cancellation" mechanism (back before there were specific `Actor`
methods for such things) that was mostly (only?) used before IPC
`Channel` closures to "more gracefully cancel" the connection's parented
RPC tasks. Since we now have explicit runtime-RPC endpoints for
conducting remote cancellation of both tasks and full actors, it should
really be removed anyway, because:
- a `None`-msg setinel is inconsistent with other RPC endpoint handling
input patterns which (even prior to typed msging) had specific
msg-value triggers.
- the IPC endpoint's (block) implementation should use
`Actor.cancel_rpc_tasks(parent_chan=chan)` instead of a manual loop
through a `Actor._rpc_tasks.copy()`..
Deats:
- mask the `Channel.send(None)` calls from both the `Actor._stream_handler()` tail
as well as from the `._portal.open_portal()` was connected block.
- mask the msg loop endpoint block and toss in lotsa notes.
Unrelated tweaks:
- drop `Actor._debug_mode`; unused.
- make `Actor.cancel_server()` return a `bool`.
- use `.msg.pretty_struct.Struct.pformat()` to show any msg that is
ignored (bc invalid) in `._push_result()`.
Add both the `.send()` and `.recv()` handling blocks to a common
`_raise_msg_type_err()` which includes detailed error msg formatting:
- the `.recv()` side case does introspection of the `Msg` fields and
attempting to report the exact (field type related) issue
- `.send()` side does some boxed-error style tb formatting like
`RemoteActorError`.
- add a `strict_types: bool` to `.send()` to allow for just
warning on bad inputs versus raising, but always raise from any
`Encoder` type error.
As detailed in the surrounding notes, it's pretty advantageous to always
have the child context task ensure the first msg it relays back is
msg-type checked against the current spec and thus `MsgCodec`. Implement
the check via a simple codec-roundtrip of the `Started` msg such that
the `.pld` payload is always validated before transit. This ensures the
child will fail early and notify the parent before any streaming takes
place (i.e. the "nasty" dialog protocol phase).
The main motivation here is to avoid inter-actor task syncing bugs that
are hard(er) to recover from and/or such as if an invalid typed msg is
sent to the parent, who then ignores it (depending on config), and then
the child thinks the parent is in some presumed state while the parent
is still thinking a first msg has yet to arrive. Doing the stringent
check on the sender side (i.e. the child is sending the "first"
application msg via `.started()`) avoids/sidesteps dealing with such
syncing/coordinated-state problems by keeping the entire IPC dialog in
a "cheap" or "control" style transaction up until a stream is opened.
Iow, the parent task's `.open_context()` block entry can't occur until
the child side is definitely (as much as is possible with IPC msg type
checking) in a correct state spec wise. During any streaming phase in
the dialog the msg-type-checking is NOT done for performance (the
"nasty" protocol phase) and instead any type errors are relayed back
from the receiving side. I'm still unsure whether to take the same
approach on the `Return` msg, since at that point erroring early doesn't
benefit the parent task if/when a msg-type error occurs? Definitely more
to ponder and tinker out here..
Impl notes:
- a gotcha with the roundtrip-codec-ed msg is that it often won't match
the input `value` bc in the `msgpack` case many native python
sequence/collection types will map to a common array type due to the
surjection that `msgpack`'s type-sys imposes.
- so we can't assert that `started == rt_started` but it may be useful
to at least report the diff of the type-reduced payload so that the
caller can at least be notified how the input `value` might be
better type-casted prior to call, for ex. pre-casting to `list`s.
- added a `._strict_started: bool` that could provide the stringent
checking if desired in the future.
- on any validation error raise our `MsgTypeError` from it.
- ALSO change over the lingering `.send_yield()` deprecated meth body
to use a `Yield()`.
Such that the current `kwargs: dict` field can eventually be strictly
msg-typed (eventually directly from a `@context` def) using modern typed
python's hippest syntactical approach B)
Also proto a new `CancelAck(Return)` subtype msg for supporting msg-spec
agnostic `Actor.cancel_xx()` method calls in the runtime such that
a user can't break cancellation (and thus SC) by dynamically setting
a codec that doesn't allow `bool` results (as an eg. in this case).
Note that the msg isn't used yet in `._rpc` but that's a comin!
Set a diff `Msg.pld` spec per test and then send multiple types to
a child actor making sure the child can only send certain types over
a stream and fails with validation or decode errors ow. The test is also
param-ed both with and without hooks demonstrating how a custom type,
`NamespacePath`, needs them for effective use. The subactor IPC context
child is passed a `expect_ipc_send: dict` which relays the values along
with their expected `.send()`-ability.
Deats on technical refinements:
------ - ------
- added a `iter_maybe_sends()` send-value-as-msg-auditor and predicate
generator (literally) so as to be able to pre-determine if given the
current codec and `send_values` which values are expected to be IPC
transmittable.
- as per ^, the diff value-msgs are first round-tripped inside
a `Started` msg using the configured codec in the parent/root actor
before bothering with using IPC primitives + a subactor; this is how
the `expect_ipc_send` table is generated initially.
- for serializing the specs (`Union[Type]`s as required by `msgspec`),
added a pair of codec hooks: `enc/dec_type_union()` (that ideally we
move into a `.msg` submod eventually) which code the type-values as
a `list[str]` of names.
- the `dec_` hook had to be modified to NOT raise an error when an
invalid/unhandled value arrives, this is because we do NOT want the
RPC msg handling loop to raise on the `async for msg in chan:` and
instead prefer to ignore and warn (for now, but eventually respond
with error msg - see notes in hook body) these msgs when sent during
a streaming phase; `Context.started()` will however error on a bad
input for the current msg-spec since it is part of the "cheap"
dialog (again see notes in `._context`) wherein the `Started` msg
is always roundtripped prior to `Channel.send()` to guarantee
the child adheres to its own spec.
- tossed in lotsa `print()`s for console groking of the run progress.
Further notes on typed-msging breaking cancellation:
------ - ------
- turns out since the runtime's cancellation implementation, being done
with `Actor.cancel()` methods and friends will actually break when
a stringent spec is applied (eg. a single type-spec) since the return
values from said methods are generally `bool`s..
- this means we do indeed need special handling of "runtime RPC method
invocations" since ideally a user's msg-spec choices do not break core
functionality on them XD
=> The obvi solution is to add a/some special sub-`Msg` types for such
cases, possibly just a `RuntimeReturn(Return)` type that will always
include a `.pld: bool` for these cancel methods such that their
results are always handled without msg type errors.
More to come on a (hopefully) elegant solution to that last bit!
Since I needed the `break_ipc()` helper from the
`examples/advanced_faults/ipc_failure_during_stream.py` used in the
`test_advanced_faults` suite, might as well move it into a pkg-wide
importable module. Also changed the default break method to be
`socket_close` which just calls `Stream.socket.close()` underneath in
`trio`.
Also tweak that example to not keep sending after the stream has been
broken since with new `trio` that will raise `ClosedResourceError` and
in the wrapping test we generally speaking want to see a hang and then
cancel via simulated user sent SIGINT/ctl-c.
Yes, this is "the switch" and will likely cause the test suite to bail
until a few more fixes some in.
Tweaked a couple `.msg` pkg exports:
- remove `__spec__` (used by modules) and change it to `__msg_types:
lists[Msg]` as well as add a new `__msg_spec__: TypeAlias`, being the
default `Any` paramed spec.
- tweak the naming of `msg.types` lists of runtime vs payload msgs to:
`._runtime_msgs` and `._payload_msgs`.
- just build `__msg_types__` out of the above 2 lists.
Since with my in-index runtime-port to our native msg-spec it seems
these ones are hanging B(
- `test_one_end_stream_not_opened()`
- `test_maybe_allow_overruns_stream()`
Tossing in some `trio.fail_after()`s seems to at least gnab them as
failures B)
Though the runtime hasn't been changed over in this patch (it was in the
local index at the time however), the test does now demonstrate that
using a `Started` the correctly typed `.pld` will codec correctly when
passed manually to `MsgCodec.encode/decode()`.
Despite not having the runtime ported to the new shuttle msg set
(meaning the mentioned test will fail without the runtime port patch),
I was able to get this first original test working that limits payload
packets as a `Msg.pld: NamespacePath`this as long as we spec
`enc/dec_hook()`s then the `Msg.pld` will be processed correctly as per:
https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
in both the `Any` and `NamespacePath|None` spec cases.
^- turns out in this case -^ that the codec hooks only get invoked on
the unknown-fields NOT the entire `Struct`-msg.
A further gotcha was merging a `|None` into the `pld_spec` since this
test spawns a subactor and opens a context via `send_back_nsp()` and
that func has no explicit `return` - so of course it delivers
a `Return(pld=None)` which will fail if we only spec `NamespacePath`.
Since `contextvars.ContextVar` seems to reset to the default in every
new task, switching to using `trio.lowlevel.RunVar` kinda gets close to
what we'd like where a child scope can override what's in the rent but
ideally without modifying the rent's. I tried `tricycle.TreeVar` as well
but it also seems to reset across (embedded) nurseries in our runtime;
need to try it again bc apparently that's not how it's suppose to work?
NOTE that for now i'm keeping the `.msg.types._ctxvar_MsgCodec` set to
the `msgspec` default (`Any` types) so that the test suite will still
pass until the runtime is ported to the new msg-spec + codec.
Surrounding and in support of all this the `Msg`-set impl deats changed
a bit as well as various stuff in `.msg` sub-mods:
- drop the `.pld` struct types for `Error`, `Start`, `StartAck` since we
don't really need the `.pld` payload field in those cases since
they're runtime control msgs for starting RPC tasks and handling
remote errors; we can just put the fields directly on each msg since
the user will never want/need to override the `.pld` field type.
- add a couple new runtime msgs and include them in `msg.__spec__`
and make them NOT inherit from `Msg` since they are runtime-specific
and thus have no need for `.pld` type constraints:
- `Aid` the actor-id identity handshake msg.
- `SpawnSpec`: the spawn data passed from a parent actor down to a
a child in `Actor._from_parent()` for which we need a shuttle
protocol msg, so might as well make it a pendatic one ;)
- fix some `Actor.uid` field types that were type-borked on `Error`
- add notes about how we need built-in `debug_mode` msgs in order to
avoid msg-type errors when using the TTY lock machinery and
a different `.pld` spec then the default `Any` is in use..
-> since `devx._debug.lock_tty_for_child()` and it's client side
`wait_for_parent_stdin_hijack()` use `Context.started('Locked')`
and `MsgStream.send('pdb_unlock')` string values as their `.pld`
contents we'd need to either always do a `ipc_pld_spec | str` or
pre-define some dedicated `Msg` types which get `Union`-ed in
for this?
- break out `msg.pretty_struct.Struct._sin_props()` into a helper func
`iter_fields()` since the impl doesn't require a struct instance.
- as mentioned above since `ContextVar` didn't work as anticipated
I next tried `tricycle.TreeVar` but that too didn't seem to keep
the `apply_codec()` setting intact across
`Portal.open_context()`/`Context.open_stream()` (it kept reverting to
the default `.pld: Any` default setting) so I finalized on
a trio.lowlevel.RunVar` for now despite it basically being
a `global`..
-> will probably come back to test this with `TreeVar` and some hot
tips i picked up from @mikenerone in the `trio` gitter, which i put in
comments surrounding proto-code.
Turns out the generics based payload speccing API, as in
https://jcristharif.com/msgspec/supported-types.html#generic-types,
DOES WORK properly as long as we don't rely on inheritance from `Msg`
a parent `Generic`..
So let's get real pedantic in the `mk_msg_spec()` internals as well as
verification in the test suite!
Fixes in `.msg.types`:
- implement (as part of tinker testing) multiple spec union building
methods via a `spec_build_method: str` to `mk_msg_spec()` and leave a
buncha notes around what did and didn't work:
- 'indexed_generics' is the only method THAT WORKS and the one that
you'd expect being closest to the `msgspec` docs (link above).
- 'defstruct' using dynamically defined msgs => doesn't work!
- 'types_new_class' using dynamically defined msgs but with
`types.new_clas()` => ALSO doesn't work..
- explicitly separate the `.pld` type-constrainable by user code msg
set into `types._payload_spec_msgs` putting the others in
a `types._runtime_spec_msgs` and the full set defined as `.__spec__`
(moving it out of the pkg-mod and back to `.types` as well).
- for the `_payload_spec_msgs` msgs manually make them inherit `Generic[PayloadT]`
and (redunantly) define a `.pld: PayloadT` field.
- make `IpcCtxSpec.functype` an in line `Literal`.
- toss in some TODO notes about choosing a better `Msg.cid` type.
Fixes/tweaks around `.msg._codec`:
- rename `MsgCodec.ipc/pld_msg_spec` -> `.msg/pld_spec`
- make `._enc/._dec` non optional fields
- wow, ^facepalm^ , make sure `._ipc.MsgpackTCPStream.__init__()` uses
`mk_codec()` since `MsgCodec` can't be (easily) constructed directly.
Get more detailed in testing:
- inside the `chk_pld_type()` helper ensure `roundtrip` is always set to
some value, `None` by default but a bool depending on legit outcome.
- drop input `generic`; no longer used.
- drop the masked `typedef` loop from `Msg.__subclasses__()`.
- for add an `expect_roundtrip: bool` and use to jump into debugger
when any expectation doesn't match the outcome.
- use new `MsgCodec` field names (as per first section above).
- ensure the encoded msg matches the decoded one from both the ad-hoc
decoder and codec loaded values.
- ensure the pld checking is only applied to msgs in the
`types._payload_spec_msgs` set by `typef.__name__` filtering
since `mk_msg_spec()` now returns the full `.types.Msg` set.
Mostly adjusting input args/logic to various spec/codec signatures and
new runtime semantics:
- `test_msg_spec_xor_pld_spec()` to verify that a shuttle prot spec and
payload spec are necessarily mutex and that `mk_codec()` enforces it.
- switch to `ipc_msg_spec` input in `mk_custom_codec()` helper.
- drop buncha commented cruft from `test_limit_msgspec()` including no
longer needed type union instance checks in dunder attributes.
Instead just instantiate `msgpack.Encoder/Decoder` instances inside
`mk_codec()` and assign them directly as `._enc/._dec` fields.
Explicitly take in named-args to both and proxy to the coder/decoder
instantiation calls directly.
Shuffling some codec internals:
- rename `mk_codec()` inputs as `ipc_msg_spec` and `ipc_pld_spec`, make
them mutex such that a payload type spec can't be passed if the
built-in msg-spec isn't used.
=> expose `MsgCodec.ipc_pld_spec` directly from `._dec.type`
=> presume input `ipc_msg_spec` is `Any` by default when no
`ipc_pld_spec` is passed since we have no way atm to enable
a similar type-restricted-payload feature without a wrapping
"shuttle protocol" ;)
- move all the payload-sub-decoders stuff prototyped in GH#311
(inside `.types`) to `._codec` as commented-for-later-maybe `MsgCodec`
methods including:
- `.mk_pld_subdec()` for registering
- `.enc/dec_payload()` for sub-codec field loading.
- also comment out `._codec.mk_tagged_union_dec()` as the orig
tag-to-decoder table factory, now mostly superseded by
`.types.mk_msg_spec()` which takes the generic parameterizing approach
instead.
- change naming to `types.mk_msg_spec(payload_type_union)` input, making
it more explicit that it expects a `Union[Type]`.
Oh right, and start exposing all the `.types.Msg` subtypes in the `.msg`
subpkg in prep for usage throughout the runtime B)
Re-arranging such that element-orders are line-arranged to our new
IPC `.msg.types.Msg` fields spec in prep for replacing the current
`dict`-as-msg impls with the `msgspec.Struct` native versions!
As per the long outstanding GH issue this starts our rigorous journey
into an attempt at a type-safe, cross-actor SC, IPC protocol Bo
boop -> https://github.com/goodboy/tractor/issues/36
The idea is to "formally" define our SC "shuttle (dialog) protocol" by
specifying a new `.msg.types.Msg` subtype-set which can fully
encapsulate all IPC msg schemas needed in order to accomplish
cross-process SC!
The msg set deviated a little in terms of (type) names from the existing
`dict`-msgs currently used in the runtime impl but, I think the name
changes are much better in terms of explicitly representing the internal
semantics of the actor runtime machinery/subsystems and the
IPC-msg-dialog required for SC enforced RPC.
------ - ------
In cursory, the new formal msgs-spec includes the following msg-subtypes
of a new top-level `Msg` boxing type (that holds the base field schema
for all msgs):
- `Start` to request RPC task scheduling by passing a `FuncSpec` payload
(to replace the currently used `{'cmd': ... }` dict msg impl)
- `StartAck` to allow the RPC task callee-side to report a `IpcCtxSpec`
payload immediately back to the caller (currently responded naively via
a `{'functype': ... }` msg)
- `Started` to deliver the first value from `Context.started()`
(instead of the existing `{'started': ... }`)
- `Yield` to shuttle `MsgStream.send()`-ed values (instead of
our `{'yield': ... }`)
- `Stop` to terminate a `Context.open_stream()` session/block
(over `{'stop': True }`)
- `Return` to deliver the final value from the `Actor.start_remote_task()`
(which is a `{'return': ... }`)
- `Error` to box `RemoteActorError` exceptions via a `.pld: ErrorData`
payload, planned to replace/extend the current `RemoteActorError.msgdata`
mechanism internal to `._exceptions.pack/unpack_error()`
The new `tractor.msg.types` includes all the above msg defs as well an API
for rendering a "payload type specification" using a
`payload_type_spec: Union[Type]` that can be passed to
`msgspec.msgpack.Decoder(type=payload_type_spec)`. This ensures that
(for a subset of the above msg set) `Msg.pld: PayloadT` data is
type-parameterized using `msgspec`'s new `Generic[PayloadT]` field
support and thus enables providing for an API where IPC `Context`
dialogs can strictly define the allowed payload-datatype-set via type
union!
Iow, this is the foundation for supporting `Channel`/`Context`/`MsgStream`
IPC primitives which are type checked/safe as desired in GH issue:
- https://github.com/goodboy/tractor/issues/365
Misc notes on current impl(s) status:
------ - ------
- add a `.msg.types.mk_msg_spec()` which uses the new `msgspec` support
for `class MyStruct[Struct, Generic[T]]` parameterize-able fields and
delivers our boxing SC-msg-(sub)set with the desired `payload_types`
applied to `.pld`:
- https://jcristharif.com/msgspec/supported-types.html#generic-types
- as a note this impl seems to need to use `type.new_class()` dynamic
subtype generation, though i don't really get *why* still.. but
without that the `msgspec.msgpack.Decoder` doesn't seem to reject
`.pld` limited `Msg` subtypes as demonstrated in the new test.
- around this ^ add a `.msg._codec.limit_msg_spec()` cm which exposes
this payload type limiting API such that it can be applied per task
via a `MsgCodec` in app code.
- the orig approach in https://github.com/goodboy/tractor/pull/311 was
the idea of making payload fields `.pld: Raw` wherein we could have
per-field/sub-msg decoders dynamically loaded depending on the
particular application-layer schema in use. I don't want to lose the
idea of this since I think it might be useful for an idea I have about
capability-based-fields(-sharing, maybe using field-subset
encryption?), and as such i've kept the (ostensibly) working impls in
TODO-comments in `.msg._codec` wherein maybe we can add
a `MsgCodec._payload_decs: dict` table for this later on.
|_ also left in the `.msg.types.enc/decmsg()` impls but renamed as
`enc/dec_payload()` (but reworked to not rely on the lifo codec
stack tables; now removed) such that we can prolly move them to
`MsgCodec` methods in the future.
- add an unused `._codec.mk_tagged_union_dec()` helper which was
originally factored out the #311 proto-code but didn't end up working
as desired with the new parameterized generic fields approach (now
in `msg.types.mk_msg_spec()`)
Testing/deps work:
------ - ------
- new `test_limit_msgspec()` which ensures all the `.types` content is
correct but without using the wrapping APIs in `._codec`; i.e. using
a in-line `Decoder` instead of a `MsgCodec`.
- pin us to `msgspec>=0.18.5` which has the needed generic-types support
(which took me way too long yester to figure out when implementing all
this XD)!
Leave all the proto native struct-msg stuff in `.types` since i'm
thinking it's the right name for the mod that will hold all the built-in
SCIPP msgspecs longer run. Obvi the naive codec stack stuff needs to be
cleaned out/up and anything useful moved into `._codec` ;)
The greasy details are strewn throughout a `msgspec` issue:
https://github.com/jcrist/msgspec/issues/140
and specifically this code was mostly written as part of POC example in
this comment:
https://github.com/jcrist/msgspec/issues/140#issuecomment-1177850792
This work obviously pertains to our desire and prep for typed messaging
and capabilities aware msg-oriented-protocols in #196. I added a "wants
to have" method to `Context` showing how I think we could offer a pretty
neat msg-type-set-as-capability-for-protocol system.
XXX NOTE XXX: this commit was rewritten during a rebase from a very old
version as per the prior commit.
XXX NOTE XXX: this is a heavily modified commit from the original
(ec226463) which was super out of date when rebased onto the current
branch. I went through a manual conflict rework and removed all the
legacy segments as well as rename-moved this original mod
`tractor.msg.py` -> `tractor.msg/_old_msg.py`. Further the
`NamespacePath` type def was discarded from this mod since it was from
a super old version which was already moved to a `.msg.ptr` submod.
As per original questions and discussion with `msgspec` author:
- https://github.com/jcrist/msgspec/issues/25
- https://github.com/jcrist/msgspec/issues/140
this prototypes a new (but very naive) `msgspec.Struct` codec
implementation which will be more filled out in the next commit.
Fitting in line with the issues outstanding:
- #36: (msg)spec-ing out our SCIPP (structured-con-inter-proc-prot).
(https://github.com/goodboy/tractor/issues/36)
- #196: adding strictly typed IPC msg dialog schemas, more or less
better described as "dialog/transaction scoped message specs"
using `msgspec`'s tagged unions and custom codecs.
(https://github.com/goodboy/tractor/issues/196)
- #365: using modern static type-annots to drive capability based
messaging and RPC.
(statically https://github.com/goodboy/tractor/issues/365)
This is a first draft of a new API for dynamically overriding IPC msg
codecs for a given interchange lib from any task in the runtime. Right
now we obviously only support `msgspec` but ideally this API holds
general enough to be used for other backends eventually (like
`capnproto`, and apache arrow).
Impl is in a new `tractor.msg._codec` with:
- a new `MsgCodec` type for encapsing `msgspec.msgpack.Encoder/Decoder`
pairs and configuring any custom enc/dec_hooks or typed decoding.
- factory `mk_codec()` for creating new codecs ad-hoc from a task.
- `contextvars` support for a new `trio.Task` scoped
`_ctxvar_MsgCodec: ContextVar[MsgCodec]` named 'msgspec_codec'.
- `apply_codec()` for temporarily modifying the above per task
as needed around `.open_context()` / `.open_stream()` operation.
A new test (suite) in `test_caps_msging.py`:
- verify a parent and its child can enable the same custom codec (in
this case to transmit `NamespacePath`s) with tons of pedantic ctx-vars
checks.
- ToDo: still need to implement #36 msg types in order to be able to get
decodes working (as in `MsgStream.receive()` will deliver an already
created `NamespacePath` obj) since currently all msgs come packed in `dict`-msg
wrapper packets..
-> use the proto from PR #35 to get nested `msgspec.Raw` processing up
and running Bo
By simply allowing an input `codec: tuple` of funcs for now to the
`MsgpackTCPStream` transport but, ideally wrapping this in a `Codec`
type with an API for dynamic extension of the interchange lib's msg
processing settings. Right now we're tied to `msgspec.msgpack` for this
transport but with the right design this can likely extend to other libs
in the future.
Relates to starting feature work toward #36, #196, #365.
Such that we just link on `guest`_ and use in the feat line as well as
the code ex. Fill out the IPC-stack feature bullet and put the
`.trionics` one last. Also fix-n-finish the `uv` shell install section.
Also make all code example snippets a sub-section of a new `Example
codez` section in prep to reduce the amount of code in the readme which
instead will be simply linked to in the repo in the future.
Hasn't been needed for a while since the type-annots have been exposed
from core since `trio>=0.24`. Allows us to drop a buncha sub-deps as
well like,
- `async-generator`
- `importlib-metadata`
- `mypy-extensions`
- `typing-extensions`
- `zipp`
Yah, don't really know why i listed all those but..
Since `uv`'s cpython distributions are built this way `pdbp`'s tab
completion was breaking (as was vi-mode). This adds a new
`.devx._enable_readline_feats()` import hook which checks for the
appropriate library and applies settings accordingly.
Namely since i use `xonsh` for a main shell, this includes adding it as
well as related tooling. Obvi bump the `uv.lock`.
Some other stuff retained from `poetry` days,
- add usage-comments around various (optional) deps.
- add toml section separator lines.
- go with 2-space indent.
- add comment on `trio>0.27` needed for py3.13+
Kinda like a "runtime"-y level for `.pdb()` (which is more or less like
an `.info()` for our debugger subsys) which can be used to report
internals info for those hacking on `.devx` tools.
Also, inject only the *last* 6 digits of the `id(Task)` in
`pformat_task_uid()` output by default.
Starting with a little sub-sys for tracing caller frames by marking them
with a dunder var (`__runtimeframe__` by default) and then scanning for
that frame such that code that is *calling* our APIs can be reported
easily in logging / tracing output.
New APIs:
- `find_caller_info()` which does the scan and delivers a,
- `CallerInfo` which (attempts) to expose both the runtime frame-info
and frame of the caller func along with `NamespacePath` properties.
Probably going to re-implement the dunder var bit as a decorator later
so we can bind in the literal func-object ref instead of trying to look
it up with `get_class_from_frame()`, since it's kinda hacky/non-general
and def doesn't work for closure funcs..
Since obvi we don't want to just only see the trace in the root most of
the time ;)
Currently the sig keeps firing twice in the root though, and i'm not
sure why yet..
Not sure if this is a good tactic (yet) but it at least covers us from
getting user's confused by `breakpoint()` usage causing REPL clobbering.
Always set an explicit rte raising breakpoint hook such that the user
realizes they can't use `.pause_from_sync()` without enabling debug
mode.
** CHERRY-PICK into `pause_from_sync_w_greenback` branch! **
Only warn log on a non-`trio` async lib when in the main thread to
avoid a name error when in the non-`asyncio` non-main-thread case.
=> To cherry into the `.pause_from_sync()` feature branch.
It's **almost** there, we're just missing the final translation code to
get from an `asyncio` side task to be able to call
`.devx._debug..wait_for_parent_stdin_hijack()` to do root actor TTY
locking. Then we just need to ensure internals also do the right thing
with `greenback()` for equivalent sync `breakpoint()` style pause
points.
Since i'm deferring this until later, tossing in some xfail tests to
`test_infected_asyncio` with TODOs for the needed implementation as well
as eventual test org.
By "provision" it means we add:
- `greenback` init block to `_run_asyncio_task()` when debug mode is
enabled (but which will currently rte when `asyncio` is detected)
using `.bestow_portal()` around the `asyncio.Task`.
- a call to `_debug.maybe_init_greenback()` in the `run_as_asyncio_guest()`
guest-mode entry point.
- as part of `._debug.Lock.is_main_trio_thread()` whenever the async-lib
is not 'trio' error lock the backend name (which is obvi `'asyncio'`
in this use case).
In the particular case of the `Portal.open_context().__aexit__()` frame,
due to usage of `contextlib.asynccontextmanager`, we can't easily hook
into monkeypatching a `__tracebackhide__` set nor catch-n-reraise around
the block exit without defining our own `.__aexit__()` impl. Thus, it's
prolly most sane to do something with an override of
`contextlib._AsyncGeneratorContextManager` or the public exposed
`AsyncContextDecorator` (which uses the former internally right?).
Also fixup some old `._invoke` mod paths in comments and just show
`str(eoc)` in `.open_stream().__aexit__()` terminated-by-EoC log msg
since the `repr()` form won't pprint the IPC msg nicely..
Change the name to `Lock.is_main_trio_thread()` indicating that when
`True` the thread is both the main one **and** the one that called
`trio.run()`. Add a todo for just copying the
`trio._util.is_main_thread()` impl (since it's private / may change) and
some brief notes about potential usage of
`trio.from_thread.check_cancelled()` to detect non-`.to_thread` thread
spawns.
Now supports use from any `trio` task, any sync thread started with
`trio.to_thread.run_sync()` AND also via `breakpoint()` builtin API!
The only bit missing now is support for `asyncio` tasks when in infected
mode.. Bo
`greenback` setup/API adjustments:
- move `._rpc.maybe_import_gb()` to -> `devx._debug` and factor out the cached
import checking into a sync func whilst placing the async `.ensure_portal()`
bootstrapping into a new async `maybe_init_greenback()`.
- use the new init-er func inside `open_root_actor()` with the output
predicating whether we override the `breakpoint()` hook.
core `devx._debug` implementation deatz:
- make `mk_mpdb()` only return the `pdp.Pdb` subtype instance since
the sigint unshielding func is now accessible from the `Lock`
singleton from anywhere.
- add non-main thread support (at least for `trio.to_thread` use cases)
to our `Lock` with a new `.is_trio_thread()` predicate that delegates
directly to `trio`'s internal version.
- do `Lock.is_trio_thread()` checks inside any methods which require
special provisions when invoked from a non-main `trio` thread:
- `.[un]shield_sigint()` methods since `signal.signal` usage is only
allowed from cpython's main thread.
- `.release()` since `trio.StrictFIFOLock` can only be called from
a `trio` task.
- rework `.pause_from_sync()` itself to directly call `._set_trace()`
and don't bother with `greenback._await()` when we're already calling
it from a `.to_thread.run_sync()` thread, oh and try to use the
thread/task name when setting `Lock.local_task_in_debug`.
- make it an RTE for now if you try to use `.pause_from_sync()` from any
infected-`asyncio` task, but support is (hopefully) coming soon!
For testing we add a new `test_debugger.py::test_pause_from_sync()`
which includes a ctrl-c parametrization around the
`examples/debugging/sync_bp.py` script which includes all currently
supported/working usages:
- `tractor.pause_from_sync()`.
- via `breakpoint()` overload.
- from a `trio.to_thread.run_sync()` spawn.
I must have had a local touched file but never committed or something?
Seems that new `pytest` requires a top level `tests` pkg in order for
relative `.conftest` imports to work.
This is what was breaking the nested debugger test (where it was failing
on the traceback content matching) and it makes sense.. XD
=> We always want to use the locally boxed `RemoteActorError`'s
traceback content NOT overwrite it with that from the src actor..
Also gets rid of setting the `'relay_uid'` since it's pulled from the
final element in the `'relay_path'` anyway.
Use new `RemoteActorError` fields in various assertions particularly
ensuring that an RTE relayed through the spawner from the little_bro
shows up at the client with the right number of entries in the
`.relay_path` and that the error is raised in the client as desired in
the original use case from `modden`'s remote spawn spawn request API
(which was kinda the whole original motivation to finally get all this
multi-actor error relay stuff workin).
Case extensions:
- RTE relayed from little_bro through spawner to client when
`raise_sub_spawn_error_after` is set; in this case test should raise
the relayed and RAE boxed RTE right up to the `trio.run()`.
-> ensure the `rae.src_uid`, `.relay_uid` are set correctly.
-> ensure ctx cancels are no acked.
- use `expect_ctxc()` around root's `tell_little_bro()` usage.
- do `debug_mode` assertions when enabled by test harness in each actor
layer.
- obvi use new `.src_type`/`.boxed_type` for final error propagation
assertions.
The misname of `._boxed_type` as `._src_type` was only manifesting as
a reallly strange boxing error with a packed exception-group, not sure
how or why only that but it's fixed now XD
Start refining/cleaning out stuff for sure we don't need (based on
multiple local test runs):
- discard `.src_actor_uid` fully since test set has been moved over to
`.src_uid`; this means also removing the `.msgdata` insertion from
`pack_error()`; a patch to all internals is coming next obvi!
- don't pass `boxed_type` to `RemoteActorError.__init__()` from
`unpack_error()` since it's now set directly via the
`.msgdata["boxed_type_str"]`/`error_msg: dict` input , but in the case
where **it is passed as an arg** (only for ctxc in `._rpc._invoke()`
rn) make sure we only do the `.__init__()` insert when `boxed_type is
not None`.
Since adding more complex inter-peer (actor) testing scenarios, we
definitely have an immediate need for `trio`'s style of "inceptions" but
for nesting `RemoteActorError`s as they're relayed through multiple
actor-IPC hops. So for example, a remote error relayed "through" some
proxy actor to another ends up packing a `RemoteActorError` into another
one such that there are 2 layers of RAEs with the first
containing/boxing an original src actor error (type).
In support of this extension to `RemoteActorError` we add:
- `get_err_type()` error type resolver helper (factored fromthe
body of `unpack_error()`) to be used whenever rendering
`.src_type`/`.boxed_type`.
- `.src_type_str: str` which is pulled from `.msgdata` and holds the
above (eventually when unpacked) type as `str`.
- `._src_type: BaseException|None` for the original
"source" actor's error as unpacked in any remote (actor's) env and
exposed as a readonly property `.src_type`.
- `.boxed_type_str: str` the same as above but for the "last" boxed
error's type; when the RAE is unpacked at its first hop this will
be **the same as** `.src_type_str`.
- `._boxed_type: BaseException` which now similarly should be "rendered"
from the below type-`str` field instead of passed in as a error-type
via `boxed_type` (though we still do for the ctxc case atm, see
notes).
|_ new sanity checks in `.__init__()` mostly as a reminder to handle
that ^ ctxc case ^ more elegantly at some point..
|_ obvi we discard the previous `suberror_type` input arg.
- fully remove the `.type`/`.type_str` properties instead expecting
usage of `.boxed_/.src_` equivalents.
- start deprecation of `.src_actor_uid` and make it delegate to new
`.src_uid`
- add `.relay_uid` propery for the last relay/hop's actor uid.
- add `.relay_path: list[str]` which holds the per-hop updated sequence
of relay actor uid's which consecutively did boxing of an RAE.
- only include `.src_uid` and `.relay_path` in reprol() output.
- factor field-to-str rendering into a new `_mk_fields_str()`
and use it in `.__repr__()`/`.reprol()`.
- add an `.unwrap()` to (attempt to) render the src error.
- rework `pack_error()` to handle inceptions including,
- packing the correct field-values for the new `boxed_type_str`, `relay_uid`,
`src_uid`, `src_type_str`.
- always updating the `relay_path` sequence with the uid of the
current actor.
- adjust `unpack_error()` to match all these changes,
- pulling `boxed_type_str` and passing any resolved `boxed_type` to
`RemoteActorError.__init__()`.
- use the new `Context.maybe_raise()` convenience method.
Adjust `._rpc` packing to `ContextCancelled(boxed_type=trio.Cancelled)`
and tweak some more log msg formats.
Such that it's set to whatever `Actor.reg_addrs: list[tuple]` is during
the actor's init-after-spawn guaranteeing each actor has at least the
registry infos from its parent. Ensure we read this if defined over
`_root._default_lo_addrs` in `._discovery` routines, namely
`.find_actor()` since it's the one API normally used without expecting
the runtime's `current_actor()` to be up.
Update the latest inter-peer cancellation test to use the `reg_addr`
fixture (and thus test this new runtime-vars value via `find_actor()`
usage) since it was failing if run *after* the infected `asyncio` suite
due to registry contact failure.
Since it's handy to be able to debug the *writing* of this instance var
(particularly when checking state passed down to a child in
`Actor._from_parent()`), rename and wrap the underlying
`Actor._reg_addrs` as a settable `@property` and add validation to
the `.setter` for sanity - actor discovery is a critical functionality.
Other tweaks:
- fix `.cancel_soon()` to pass expected argument..
- update internal runtime error message to be simpler and link to GH issues.
- use new `Actor.reg_addrs` throughout core.
Since we'd like to eventually allow a diverse set of transport
(protocol) methods and stacks, and a multi-peer discovery system for
distributed actor-tree applications, this reworks all runtime internals
to support multi-homing for any given tree on a logical host. In other
words any actor can now bind its transport server (currently only
unsecured TCP + `msgspec`) to more then one address available in its
(linux) network namespace. Further, registry actors (now dubbed
"registars" instead of "arbiters") can also similarly bind to multiple
network addresses and provide discovery services to remote actors via
multiple addresses which can now be provided at runtime startup.
Deats:
- adjust `._runtime` internals to use a `list[tuple[str, int]]` (and
thus pluralized) socket address sequence where applicable for transport
server socket binds, now exposed via `Actor.accept_addrs`:
- `Actor.__init__()` now takes a `registry_addrs: list`.
- `Actor.is_arbiter` -> `.is_registrar`.
- `._arb_addr` -> `._reg_addrs: list[tuple]`.
- always reg and de-reg from all registrars in `async_main()`.
- only set the global runtime var `'_root_mailbox'` to the loopback
address since normally all in-tree processes should have access to
it, right?
- `._serve_forever()` task now takes `listen_sockaddrs: list[tuple]`
- make `open_root_actor()` take a `registry_addrs: list[tuple[str, int]]`
and defaults when not passed.
- change `ActorNursery.start_..()` methods take `bind_addrs: list` and
pass down through the spawning layer(s) via the parent-seed-msg.
- generalize all `._discovery()` APIs to accept `registry_addrs`-like
inputs and move all relevant subsystems to adopt the "registry" style
naming instead of "arbiter":
- make `find_actor()` support batched concurrent portal queries over
all provided input addresses using `.trionics.gather_contexts()` Bo
- syntax: move to using `async with <tuples>` 3.9+ style chained
@acms.
- a general modernization of the code to a python 3.9+ style.
- start deprecation and change to "registry" naming / semantics:
- `._discovery.get_arbiter()` -> `.get_registry()`
If `stackscope` is importable and debug_mode is enabled then we by
default call and report `.devx.enable_stack_on_sig()` is set B)
This makes debugging unexpected (SIGINT ignoring) hangs a cinch!
We're passing a `extra_frames_up_when_async=2` now (from prior attempt
to hide `CancelScope.__exit__()` when `shield=True`) and thus both
`debug_func`s must accept it 🤦
On the brighter side found out that the `TypeError` from the call-sig
mismatch was actually being swallowed entirely so add some
`.exception()` msgs for such cases to at least alert the dev they broke
stuff XD
It's been on the todo for a while and I've given up trying to properly
hide the `trio.CancelScope.__exit__()` frame for now instead opting to
just `log.pdb()` a big apology XD
Users can obvi still just not use the flag and wrap `tractor.pause()` in
their own cs block if they want to avoid having to hit `'up'` in the pdb
REPL if needed in a cancelled task-scope.
Impl deatz:
- factor orig `.pause()` impl into new `._pause()` so that we can more tersely
wrap the original content depending on `shield: bool` input; only open
the cancel-scope when shield is set to avoid aforemented extra strack
frame annoyance.
- pass through `shield` to underlying `_pause` and `debug_func()` so we
can actually know when so log our apology.
- add a buncha notes to new `.pause()` wrapper regarding the inability
to hide the cancel-scope `.__exit__()`, inluding that overriding the
code in `trio._core._run.CancelScope` doesn't seem to solve the issue
either..
Unrelated `maybe_wait_for_debugger()` tweaks:
- don't read `Lock.global_actor_in_debug` more then needed, rename local
read var to `in_debug` (since it can also hold the root actor uid, not
just sub-actors).
- shield the `await debug_complete.wait()` since ideally we avoid the
root cancellation child-actors in debug even when the root calls this
func in a cancelled scope.
Since this was changed as part of overall project wide logging format
updates, and i ended up changing the both the crash and pause `.pdb()`
msgs to include some multi-line-ascii-"stuff", might as well make the
pre-prompt checks in the test suite more flexible to match.
As such, this exposes 2 new constants inside the `.devx._debug` mod:
- `._pause_msg: str` for the pre `tractor.pause()` header emitted via
`log.pdb()` and,
- `._crash_msg: str` for the pre `._post_mortem()` equiv when handling
errors in debug mode.
Adjust the test suite to use these values and thus make us more capable
to absorb changes in the future as well:
- add a new `in_prompt_msg()` predicate, very similar to `assert_before()`
but minus `assert`s which takes in a `parts: list[str]` to match
in the pre-prompt stdout.
- delegate to `in_prompt_msg()` in `assert_before()` since it was mostly
duplicate minus `assert`.
- adjust all previous `<patt> in before` asserts to instead use
`in_prompt_msg()` with separated pre-prompt-header vs. actor-name
`parts`.
- use new `._pause/crash_msg` values in all such calls including any
`assert_before()` cases.
Allow callers to stick in a header to the `.pdb()` level emitted msg(s)
such that any "waiting status" content is only shown if the caller
actually get's blocked waiting for the debug lock; use it inside the
`._spawn` sub-process reaper call.
Also, return early if `Lock.global_actor_in_debug == None` and thus
only enter the poll loop when actually needed, consequently raise
if we fall through the loop without acquisition.
When entered by the root actor avoid excessive polling cycles by,
- blocking on the `Lock.no_remote_has_tty: trio.Event` and breaking
*immediately* when set (though we should really also lock
it from the root right?) to avoid extra loops..
- shielding the `await trio.sleep(poll_delay)` call to avoid any local
cancellation causing the (presumably root-actor task) caller to move
on (possibly to cancel its children) and instead to continue
poll-blocking until the lock is actually released by its user.
- `break` the poll loop immediately if no remote locker is detected.
- use `.pdb()` level for reporting lock state changes.
Also add a #TODO to handle calls by non-root actors as it pertains to
Can be optionally enabled via a new `enable_stack_on_sig()` which will
swap in the SIGUSR1 handler. Much thanks to @oremanj for writing this
amazing project, it's thus far helped me fix some very subtle hangs
inside our new IPC-context cancellation machinery that would have
otherwise taken much more manual pdb-ing and hair pulling XD
Full credit for `dump_task_tree()` goes to the original project author
with some minor tweaks as was handed to me via the trio-general matrix
room B)
Slight changes from orig version:
- use a `log.pdb()` emission to pprint to console
- toss in an ex sh CLI cmd to trigger the dump from another terminal
using `kill` + `pgrep`.
Implement it like you'd expect using simply a wrapping
`trio.CancelScope` which is itself shielded by the input `shield: bool`
B)
There's seemingly still some issues with the frame selection when the
REPL engages and not sure how to resolve it yet but at least this does
indeed work for practical purposes. Still needs a test obviously!
Starting of with just a `typer` (and thus transitively `click`)
`typer.Typer.callback` hook which allows passthrough of the `--ll
<loglevel: str>` and `--pdb <debug_mode: bool>` flags for use when
building CLIs that use the runtime Bo
Still needs lotsa refinement and obviously better docs but, the doc
string for `load_runtime_vars()` shows how to use the underlying
`.devx._debug.open_crash_handler()` via a wrapper that can be passed the
`--pdb` flag and then enable debug mode throughout the entire actor
system.
Where `.devx` is "developer experience", a hopefully broad enough subpkg
name for all the slick stuff planned to augment working on the actor
runtime 💥
Move the `._debug` module into the new subpkg and adjust rest of core
code base to reflect import path change. Also add a new
`.devx._debug.open_crash_handler()` manager for wrapping any sync code
outside a `trio.run()` which is handy for eventual CLI addons for
popular frameworks like `click`/`typer`.
For whatever reason pdb(p), and in general, will show the frame of the
*next* python instruction/LOC on initial entry (at least using
`.set_trace()`), as such remove the `try/finally` block in the sync
code entrypoint `.pause_from_sync()`, and also since doesn't seem like
we really need it anyway.
Further, and to this end:
- enable hidden frames support in our default config.
- fix/drop/mask all the frame ref-ing/mangling we had prior since it's no
longer needed as well as manual `Lock` releasing which seems to work
already by having the `greenback` spawned task do it's normal thing?
- move to no `Union` type annots.
- hide all frames that can add "this is the runtime confusion" to
traces.
This works now for supporting a new `tractor.pause_from_sync()`
`tractor`-aware-replacement for `Pdb.set_trace()` from sync functions
which are also scheduled from our runtime. Uses `greenback` to do all
the magic of scheduling the bg `tractor._debug._pause()` task and
engaging the normal TTY locking machinery triggered by `await
tractor.breakpoint()`
Further this starts some public API renaming, making a switch to
`tractor.pause()` from `.breakpoint()` which IMO much better expresses
the semantics of the runtime intervention required to suffice
multi-process "breakpointing"; it also is an alternate name for the same
in computer science more generally: https://en.wikipedia.org/wiki/Breakpoint
It also avoids using the same name as the `breakpoint()` built-in which
is important since there **is alot more going on** when you call our
equivalent API.
Deats of that:
- add deprecation warning for `tractor.breakpoint()`
- add `tractor.pause()` and a shorthand, easier-to-type, alias `.pp()`
for "pause-point" B)
- add `pause_from_sync()` as the new `breakpoint()`-from-sync-function
hack which does all the `greenback` stuff for the user.
Still TODO:
- figure out where in the runtime and when to call
`greenback.ensure_portal()`.
- fix the frame selection issue where
`trio._core._ki._ki_protection_decorator:wrapper` seems to be always
shown on REPL start as the selected frame..
Only found this by luck more or less (while working on something in
a client project) and it turns out we can actually get to (yet another)
hang state where SIGINT will be ignored by the root actor on teardown..
I've added all the necessary logic flags to reproduce. We obviously need
a follow up bug issue and a test suite to replicate!
It appears as though the following are required based on very light
tinkering:
- infected asyncio mode active
- debug mode active
- the `trio` context must breakpoint *before* `.started()`-ing
- the `asyncio` must **not** error
Allows tests (including any `@tractor_test`s) to subscribe to a CLI flag
`--tpdb` (for "tractor python debugger") which the session can provide
to tests which can then proxy the value to `open_root_actor()` (via
`open_nursery()`) when booting the runtime - thus enabling our debug
mode globally to any subscribers B)
This is real handy if you have some failures but can't determine the
root issue without jumping into a `pdbp` REPL inside a (sub-)actor's
spawned-task.
- Remove `exceptiongroup` import,
- pin to py 3.11 in `setup.py`
- revert any lingering `tractor.devx` imports; sub-pkg is coming in
a downstream PR!
- remove weird double `@property` lingering from conflict reso..
- modern `pytest` requires conftest mod mods to be relative imported.
More or less just simplifies to not seeing the stream closure errors and
instead expecting KBIs from the simulated user who 'ctl-cs after hang'.
Toss in a little `stuff_hangin_ctlc()` to the script to wrap all that
and always check stream closure before sending the final KBI.
I swear long ago it used to operate this way but, I guess this finalizes
the design decision. It makes a lot more sense to *not* propagate any
`trio.EndOfChannel` raised from a `Context.open_stream() as stream:`
block when that EoC is due to graceful-explicit stream termination.
We use the EoC much like a `StopAsyncIteration` where the error
indicates termination of the stream due to either:
- reception of a stop IPC msg indicating the far end ended the stream
(gracecfully),
- closure of the underlying `Context._recv_chan` either by the runtime
or due to user code having called `MsgStream.aclose()`.
User code shouldn't expect to handle EoC outside the block since the
`@acm` having closed should indicate the exactly same lifetime state
(of said stream) ;)
Deats:
- add special EoC handler in `.open_stream()` which silently "absorbs"
the error only when the stream is already marked as closed (meaning
the EoC indeed corresponds to IPC closure) with an assert for now
ensuring the error is the same as set to `MsgStream._eoc`.
- in `MsgStream.receive()` break up the handlers for EoC and
`trio.ClosedResourceError` since the error instances are saved to
different variables and we **don't** want to rewrite the exception in
the eoc case (normally to mask `trio` internals in tbs) bc we need the
instance to be the exact one for doing checks inside
`.open_stream().__aexit__()` to absorb it.
Other surrounding "improvements":
- start using the new `Context.maybe_raise()` helper where it can easily
replace existing equivalent block-sections.
- use new `RemoteActorError.src_uid` as required.
- `trio_typing` is nearly obsolete since `trio >= 0.23`
- `exceptiongroup` is built-in to python 3.11
- `async_generator` primitives have lived in `contextlib` for quite
a while!
Since `._runtime` was getting pretty long (> 2k LOC) and much of the RPC
low-level machinery is fairly isolated to a handful of task-funcs, it
makes sense to re-org the RPC task scheduling and driving msg loop to
its own code space.
The move includes:
- `process_messages()` which is the main IPC business logic.
- `try_ship_error_to_remote()` helper, to box local errors for the wire.
- `_invoke()`, the core task scheduler entrypoing used in the msg loop.
- `_invoke_non_context()`, holds impls for non-`@context` task starts.
- `_errors_relayed_via_ipc()` which does all error catch-n-boxing for
wire-msg shipment using `try_ship_error_to_remote()` internally.
Also inside `._runtime` improve some `Actor` methods docs.
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`
Previously i was trying to approach this using lots of
`__tracebackhide__`'s in various internal funcs but since it's not
exactly straight forward to do this inside core deps like `trio` and the
stdlib, it makes a bit more sense to optionally catch and re-raise
certain classes of errors from their originals using `raise from` syntax
as per:
https://docs.python.org/3/library/exceptions.html#exception-context
Deats:
- litter `._context` methods with `__tracebackhide__`/`hide_tb` which
were previously being shown but that don't need to be to application
code now that cancel semantics testing is finished up.
- i originally did the same but later commented it all out in `._ipc`
since error catch and re-raise instead in higher level layers
(above the transport) seems to be a much saner approach.
- add catch-n-reraise-from in `MsgStream.send()`/.`receive()` to avoid
seeing the depths of `trio` and/or our `._ipc` layers on comms errors.
Further this patch adds some refactoring to use the
same remote-error shipper routine from both the actor-core in the RPC
invoker:
- rename it as `try_ship_error_to_remote()` and call it from
`._invoke()` as well as it's prior usage.
- make it optionally accept `cid: str` a `remote_descr: str` and of
course a `hide_tb: bool`.
Other misc tweaks:
- add some todo notes around `Actor.load_modules()` debug hooking.
- tweak the zombie reaper log msg and timeout value ;)
Since importing from our top level `conftest.py` is not scaleable
or as "future forward thinking" in terms of:
- LoC-wise (it's only one file),
- prevents "external" (aka non-test) example scripts from importing
content easily,
- seemingly(?) can't be used via abs-import if using
a `[tool.pytest.ini_options]` in a `pyproject.toml` vs.
a `pytest.ini`, see:
https://docs.pytest.org/en/8.0.x/reference/customize.html#pyproject-toml)
=> Go back to having an internal "testing" pkg like `trio` (kinda) does.
Deats:
- move generic top level helpers into pkg-mod including the new
`expect_ctxc()` (which i needed in the advanced faults testing script.
- move `@tractor_test` into `._testing.pytest` sub-mod.
- adjust all the helper imports to be a `from tractor._testing import <..>`
Rework `test_ipc_channel_break_during_stream()` and backing script:
- make test(s) pull `debug_mode` from new fixture (which is now
controlled manually from `--tpdb` flag) and drop the previous
parametrized input.
- update logic in ^ test for "which-side-fails" cases to better match
recently updated/stricter cancel/failure semantics in terms of
`ClosedResouruceError` vs. `EndOfChannel` expectations.
- handle `ExceptionGroup`s with expected embedded errors in test.
- better pendantics around whether to expect a user simulated KBI.
- for `examples/advanced_faults/ipc_failure_during_stream.py` script:
- generalize ipc breakage in new `break_ipc()` with support for diff
internal `trio` methods and a #TODO for future disti frameworks
- only make one sub-actor task break and the other just stream.
- use new `._testing.expect_ctxc()` around ctx block.
- add a bit of exception handling with `print()`s around ctxc (unused
except if 'msg' break method is set) and eoc cases.
- don't break parent side ipc in loop any more then once
after first break, checked via flag var.
- add a `pre_close: bool` flag to control whether
`MsgStreama.aclose()` is called *before* any ipc breakage method.
Still TODO:
- drop `pytest.ini` and add the alt section to `pyproject.py`.
-> currently can't get `--rootdir=` opt to work.. not showing in
console header.
-> ^ also breaks on 'tests' `enable_modules` imports in subactors
during discovery tests?
With the seeming cause that some cases occasionally raise
`ExceptionGroup` instead of a (collapsed out) single error which, in
those cases at least try to check that `.exceptions` has the original
error.
Found exactly why trying this won't work when playing around with
opening workspaces in `modden` using a `Portal.open_context()` back to
the 'bigd' root actor: the RPC machinery only registers one entry in
`Actor._contexts` which will get overwritten by each task's side and
then experience race-based IPC msging errors (eg. rxing `{'started': _}`
on the callee side..). Instead make opening a ctx back to the self-actor
a runtime error describing it as an invalid op.
To match:
- add a new test `test_ctx_with_self_actor()` to the context semantics
suite.
- tried out adding a new `side: str` to the `Actor.get_context()` (and
callers) but ran into not being able to determine the value from in
`._push_result()` where it's needed to figure out which side to push
to.. So, just leaving the commented arg (passing) in the runtime core
for now in case we can come back to trying to make it work, tho i'm
thinking it's not the right hack anyway XD
Call it `allow_msg_keys: list[str] = ['yield']` and set it to accept
`['yield', 'return']` from the drain loop in `.aclose()`. Only pass the
last key error to `_raise_from_no_key_in_msg()` in the fall-through
case.
Somehow this seems to prevent all the intermittent test failures i was
seeing in local runs including when running the entire suite all in
sequence; i ain't complaining B)
Much like similar recent changes throughout the core, build out `msg:
str` depending on error cases and emit with `.cancel()` level as
appropes. Also mute (via level) some duplication in the cancel case
inside `_run_asyncio_task()` for console noise reduction.
Since apparently `str(KeyboardInterrupt()) == ''`? So instead add little
`<str> or repr(merr)` expressions throughout to avoid blank strings
rendering if various `repr()`/`.__str__()` outputs..
Not sure if it's really that useful other then for reporting errors from
`current_actor()` but at least it alerts `tractor` devs and/or users
when the runtime has already terminated vs. hasn't been started
yet/correctly.
Set the `._last_actor_terminated: tuple` in the root's final block which
allows testing for an already terminated tree which is the case where
`._state._current_actor == None` and the last is set.
Including mostly tweaking asserts on relayed `ContextCancelled`s and
the new pub ctx properties: `.outcome`, `.maybe_error`, etc. as it
pertains to graceful (absorbed) remote cancellation vs. loud ctxc cases
expected to be raised by any `Portal.cancel_actor()` style teardown.
Start checking a variety internals like `._remote/local_error`,
`._is_self_cancelled()`, `._is_final_result_set()`, `._cancel_msg`
where applicable.
Also factor out the new `expect_ctxc()` checker to our `conftest.py` for
use in other suites.
Changes the condition logic to be more strict and moves it to a private
`._is_self_cancelled() -> bool` predicate which can be used elsewhere
(instead of having almost similar duplicate checks all over the
place..) and allows taking in a specific `remote_error` just for
verification purposes (like for tests).
Main strictness distinctions are now:
- obvi that `.cancel_called` is set (this filters any
`Portal.cancel_actor()` or other out-of-band RPC),
- the received `ContextCancelled` **must** have its `.canceller` set to
this side's `Actor.uid` (indicating we are the requester).
- `.src_actor_uid` **must** be the same as the `.chan.uid` (so the error
must have originated from the opposite side's task.
- `ContextCancelled.canceller` should be already set to the `.chan.uid`
indicating we received the msg via the runtime calling
`._deliver_msg()` -> `_maybe_cancel_and_set_remote_error()` which
ensures the error is specifically destined for this ctx-task exactly
the same as how `Actor._cancel_task()` sets it from an input
`requesting_uid` arg.
In support of the above adjust some impl deats:
- add `Context._actor: Actor` which is set once in `mk_context()` to
avoid issues (particularly in testing) where `current_actor()` raises
after the root actor / runtime is already exited. Use `._actor.uid` in
both `.cancel_acked` (obvi) and '_maybe_cancel_and_set_remote_error()`
when deciding whether to call `._scope.cancel()`.
- always cast `.canceller` to `tuple` if not null.
- delegate `.cancel_acked` directly to new private predicate (obvi).
- always set `._canceller` from any `RemoteActorError.src_actor_uid` or
failing over to the `.chan.uid` when a non-remote error (tho that
shouldn't ever happen right?).
- more extensive doc-string for `.cancel()` detailing the new strictness
rules about whether an eventual `.cancel_acked` might be set.
Also tossed in even more logging format tweaks by adding a
`type_only: bool` to `.repr_outcome()` as desired for simpler output in
the `state: <outcome-repr-here>` and `.repr_rpc()` sections of the
`.__str__()`.
Like how we set `Context._cancel_msg` in `._deliver_msg()` (in
which case normally it's an `{'error': ..}` msg), do the same when any
RPC task is remotely cancelled via `Actor._cancel_task` where that task
doesn't yet have a cancel msg set yet.
This makes is much easier to distinguish between ctx cancellations due
to some remote error vs. Explicit remote requests via any of
`Actor.cancel()`, `Portal.cancel_actor()` or `Context.cancel()`.
We don't expect `._scope.cancelled_caught` to be set really ever on
inter-peer cancellation since no ctx is ever cancelling itself, a peer
cancels some other and then bubbles back to all other peers.
Also add `ids: lambda` for `error_during_ctxerr_handling` param to
`test_peer_canceller()`
Buncha subtle details changed mostly to do with when `Context.cancel()`
gets called on "real" remote errors vs. (peer requested) cancellation
and then local side handling of `ContextCancelled`.
Specific changes to make tests pass:
- due to raciness with `sleeper_ctx.result()` raising the ctxc locally
vs. the child-peers receiving similar ctxcs themselves (and then
erroring and propagating back to the root parent), we might not see
`._remote_error` set during the sub-ctx loops (except for the sleeper
itself obvi).
- do not expect `.cancel_called`/`.cancel_caught` to be set on any
sub-ctx since currently `Context.cancel()` is only called non-shielded
and thus is not in invoked when `._scope.cancel()` is called as part
of each root-side ctx ref/block handling the inter-peer ctxc.
- do not expect `Context._scope.cancelled_caught` to be set in most cases
(even the sleeper)
TODO Outstanding adjustments not fixed yet:
-[ ] `_scope.cancelled_caught` checks outside the `.open_context()`
blocks.
Since eventually we want to implement all other RPC "func types" as
contexts underneath this starts the rework to move all the other cases
into a separate func not only to simplify the main `._invoke()` body but
also as a reminder of the intention to do it XD
Details of re-factor:
- add a new `._invoke_non_context()` which just moves all the old blocks
for non-context handling to a single def.
- factor what was basically just the `finally:` block handler (doing all
the task bookkeeping) into a new `@acm`: `_errors_relayed_via_ipc()`
with that content packed into the post-`yield` (also with a `hide_tb:
bool` flag added of course).
* include a `debug_kbis: bool` for when needed.
- since the `@context` block is the only type left in the main
`_invoke()` body, de-dent it so it's more grok-able B)
Obviously this patch also includes a few improvements regarding
context-cancellation-semantics (for the `context` RPC case) on the
callee side in order to match previous changes to the `Context` api:
- always setting any ctxc as the `Context._local_error`.
- using the new convenience `.maybe_raise()` topically (for now).
- avoiding any previous reliance on `Context.cancelled_caught` for
anything public of meaning.
Further included is more logging content updates:
- being pedantic in `.cancel()` msgs about whether termination is caused
by error or ctxc.
- optional `._invoke()` traceback hiding via a `hide_tb: bool`.
- simpler log headers throughout instead leveraging new `.__repr__()` on
primitives.
- buncha `<= <actor-uid>` sent some message emissions.
- simplified handshake statuses reporting.
Other subsys api changes we need to match:
- change to `Channel.transport`.
- avoiding any `local_nursery: ActorNursery` waiting when the
`._implicit_runtime_started` is set.
And yes, lotsa more comments for #TODOs dawg.. since there's always
somethin!
In the case where the callee side delivers us a ctxc with `.canceller`
set we can presume that remote cancellation already has taken place and
thus we don't need to do the normal call-`Context.cancel()`-on-error
step. Further, in the case where we do call it also handle any
`trio.CloseResourceError` gracefully with a `.warning()`.
Also, originally I had added a post-`yield`-maybe-raise to attempt
handling any remote ctxc the same as for the local case (i.e. raised
from `yield` line) wherein if we get a remote ctxc the same handler
branch-path would trigger, thus avoiding different behaviour in that
case. I ended up masking it out (but can't member why.. ) as it seems
the normal `.result()` call and its internal handling gets the same
behaviour? I've left in the heavily commented code in case it ends up
being the better way to go; likely making the move to having a single
code in both cases is better even if it is just a matter of deciding
whether to swallow the ctxc or not in the `.cancel_acked` case.
Further teensie improvements:
- obvi improve/simplify log msg contents as in prior patches.
- use the new `maybe_wait_for_debugger(header_msg: str)` if/when waiting
to exit in debug mode.
- another `hide_tb: bool` frame hider flag.
- rando type-annot updates of course :)
Spanning from the pub API, to instance `repr()` customization (for
logging/REPL content), to the impl details around the notion of a "final
outcome" and surrounding IPC msg draining mechanics during teardown.
A few API and field updates:
- new `.cancel_acked: bool` to replace what we were mostly using
`.cancelled_caught: bool` for but, for purposes of better mapping the
semantics of remote cancellation of parallel executing tasks; it's set
only when `.cancel_called` is set and a ctxc arrives with
a `.canceller` field set to the current actor uid indicating we
requested and received acknowledgement from the other side's task
that is cancelled gracefully.
- strongly document and delegate (and prolly eventually remove as a pub
attr) the `.cancelled_caught` property entirely to the underlying
`._scope: trio.CancelScope`; the `trio` semantics don't really map
well to the "parallel with IPC msging" case in the sense that for
us it breaks the concept of the ctx/scope closure having "caught"
something instead of having "received" a msg that the other side has
"acknowledged" (i.e. which for us is the completion of cancellation).
- new `.__repr__()`/`.__str__()` format that tries to tersely yet
comprehensively as possible display everything you need to know about
the 3 main layers of an SC-linked-IPC-context:
* ipc: the transport + runtime layers net-addressing and prot info.
* rpc: the specific linked caller-callee task signature details
including task and msg-stream instances.
* state: current execution and final outcome state of the task pair.
* a teensie extra `.repr_rpc` for a condensed rpc signature.
- new `.dst_maddr` to get a `libp2p` style "multi-address" (though right
now it's just showing the transport layers so maybe we should move to
to our `Channel`?)
- new public instance-var fields supporting more granular remote
cancellation/result/error state:
* `.maybe_error: Exception|None` for any final (remote) error/ctxc
which computes logic on the values of `._remote_error`/`._local_error`
to determine the "final error" (if any) on termination.
* `.outcome` to the final error or result (or `None` if un-terminated)
* `.repr_outcome()` for a console/logging friendly version of the
final result or error as needed for the `.__str__()`.
- new private interface bits to support all of ^:
* a new "no result yet" sentinel value, `Unresolved`, using a module
level class singleton that `._result` is set too (instead of
`id(self)`) to both determine if and present when no final result
from the callee has-yet-been/was delivered (ever).
=> really we should get rid of `.result()` and change it to
`.wait_for_result()` (or something)u
* `_final_result_is_set()` predicate to avoid waiting for an already
delivered result.
* `._maybe_raise()` proto-impl that we should use to replace all the
`if re:` blocks it can XD
* new `._stream: MsgStream|None` for when a stream is opened to aid
with the state repr mentioned above.
Tweaks to the termination drain loop `_drain_to_final_msg()`:
- obviously (obvi) use all the changes above when determining whether or
not a "final outcome" has arrived and thus breaking from the loop ;)
* like the `.outcome` `.maybe_error` and `._final_ctx_is_set()` in
the `while` pred expression.
- drop the `_recv_chan.receive_nowait()` + guard logic since it seems
with all the surrounding (and coming soon) changes to
`Portal.open_context()` using all the new API stuff (mentioned in
first bullet set above) we never hit the case of inf-block?
Oh right and obviously a ton of (hopefully improved) logging msg content
changes, commented code removal and detailed comment-docs strewn about!
After some deep logging improvements to many parts of `._runtime`,
I realized a silly detail where we are always waiting on any opened
`local_nursery: ActorNursery` to signal exit from
`Actor._stream_handler()` even in the case of being an implicitly opened
root actor (`open_root_actor()` wasn't called by user/app code) via
`._supervise.open_nursery()`..
So, to address this add a `ActorNursery._implicit_runtime_started: bool`
that can be set and then checked to avoid doing the unnecessary
`.exited.wait()` (and any subsequent warn logging on an exit timeout) in
that special but most common case XD
Matching with other subsys log format refinements, improve readability
and simplicity of the actor-nursery supervisory log msgs, including:
- simplify and/or remove any content that more or less duplicates msg
content found in emissions from lower-level primitives and sub-systems
(like `._runtime`, `_context`, `_portal` etc.).
- add a specific `._open_and_supervise_one_cancels_all_nursery()`
handler block for `ContextCancelled` to log with `.cancel()` level
noting that the case is a "remote cancellation".
- put the nursery-exit and actor-tree shutdown status into a single msg
in the `implicit_runtime` case.
- rename `.soft_wait()` -> `.soft_kill()`
- rename `.do_hard_kill()` -> `.hard_kill()`
- adjust any `trio.Process.__repr__()` log msg contents to have the
little tree branch prefix: `'|_'`
Our remote error box types `RemoteActorError`, `ContextCancelled` and
`StreamOverrun` needed a console display makeover particularly for
logging content and `repr()` in higher level primitives like `Context`.
This adds a more "dramatic" str-representation to showcase the
underlying boxed traceback content more sensationally (via ascii-art
emphasis) as well as support a more terse `.reprol()` (representation
for one-line) format that can be used for types that track remote
errors/cancels like with `Context._remote_error`.
Impl deats:
- change `RemoteActorError.__repr__()` formatting to show (sub-type
specific) `.msgdata` fields in a multi-line format (similar to our new
`.msg.types.Struct` style) followed by some ascii accented delimiter
lines to emphasize any `.msgdata["tb_str"]` packed by the remote
- for rme and subtypes allow picking the specifically relevant fields
via a type defined `.reprol_fields: list[str]` and pick for each
subtype:
|_ `RemoteActorError.src_actor_uid`
|_ `ContextCancelled.canceller`
|_ `StreamOverrun.sender`
- add `.reprol()` to show a `repr()`-on-one-line formatted string that
can be used by other multi-line-field-`repr()` styled composite types
as needed in (high level) logging info.
- toss in some mod level `_body_fields: list[str]` for summary of such
fields (if needed).
- add some new rae (remote-actor-error) props:
- `.type` around a newly named `.boxed_type`
- `.type_str: str`
- `.tb_str: str`
Hit a reallly weird bug in the `._runtime` IPC msg handling loop where
it seems that by `str.format()`-ing a `Channel` before initializing it
would put the `._MsgTransport._agen()` in an already started state
causing an irrecoverable core startup failure..
I presume it's something to do with delegating to the
`MsgpackTCPStream.__repr__()` and, something something.. the
`.set_msg_transport(stream)` getting called to too early such that
`.msgstream.__init__()` is called thus init-ing the `._agen()` before
necessary? I'm sure there's a design lesson to be learned in here
somewhere XD
This was discovered while trying to add more "fancy" logging throughout
said core for the purposes of cobbling together an init attempt at
libp2p style multi-address representations for our IPC primitives. Thus
I also tinker here with adding some new fields to `MsgpackTCPStream`:
- `layer_key`: int = 4
- `name_key`: str = 'tcp'
- `codec_key`: str = 'msgpack'
Anyway, just changed it so that if `.msgstream` ain't set then we just
return a little "null repr" `str` value thinger.
Also renames `Channel.msgstream` internally to `._transport` with
appropriate pub `@property`s added such that everything else won't break
;p
Also drops `Optional` typing vis-a-vi modern union syntax B)
Obviously we can't deterministic-ally call `.load_ref()` (since you'd
have to point to an `id()` or something and presume a particular
py-runtime + virt-mem space for it to exist?) but it at least helps with
the `str` formatting for logging purposes (like `._cancel_rpc_tasks()`)
when `repr`-ing ctxs and their specific "rpc signatures".
Maybe in the future getting this working at least for singleton types
per process (like `Actor` XD ) will be a thing we can support and make
some sense of.. Bo
Originally designed and used throughout `piker`, the subtype adds some
handy pprinting and field diffing extras often handy when viewing struct
types in logging or REPL console interfaces B)
Obvi this rejigs the `tractor.msg` mod into a sub-pkg and moves the
existing namespace obj-pointer stuff into a new `.msg.ptr` sub mod.
As per a lot of the recent refinements to `Context` cancellation, add
a new test case to replicate the original hang-on-cancel found with
`modden` when using a client actor to spawn a subactor in some other
tree where despite `Context.cancel()` being called the requesting client
would hang on the opened context with the server.
The specific scenario added here is to have,
- root actor spawns 2 children: a client and a spawn server.
- the spawn server opens with a spawn-request serve loop and begins to
wait for the client.
- client spawns and connects to the sibling spawn server, requests to
spawn a sub-actor, the "little bro", connects to it then does some
echo streaming, cancels the request with it's sibling (the spawn
server) which should in turn cancel the root's-grandchild and result
in a cancel-ack back to the client's `.open_context()`.
- root ensures that it can also connect to the grandchild (little bro),
do the same echo streaming, then ensure everything tears down
correctly after cancelling all the children.
More refinements to come here obvi in the specific cancellation
semantics and possibly causes.
Also tweaks the other tests in suite to use the new `Context` properties
recently introduced and similarly updated in the previous patch to the
ctx-semantics suite.
In order to match a very significant and coming-soon patch set to the
IPC `Context` and `Channel` cancellation semantics with significant but
subtle changes to the primitives and runtime logic:
- a new set of `Context` state pub meth APIs for checking exact
inter-actor-linked-task outcomes such as `.outcome`, `.maybe_error`,
and `.cancel_acked`.
- trying to move away from `Context.cancelled_caught` usage since the
semantics from `trio` don't really map well (in terms of cancel
requests and how they result in cancel-scope graceful closure) and
`.cancel_acked: bool` is a better approach for IPC req-resp msging.
- change test usage to access `._scope.cancelled_caught` directly.
- more pedantic ctxc-raising expects around the "type of self
cancellation" and final outcome in ctxc cases:
- `ContextCancelled` is raised by ctx (`Context.result()`) consumer
methods when `Portal.cancel_actor()` is called (since it's an
out-of-band request) despite `Channel._cancel_called` being set.
- also raised by `.open_context().__aexit__()` on close.
- `.outcome` is always `.maybe_error` is always one of
`._local/remote_error`.
Since a bug in the new `MsgStream.aclose()` impl's drain block logic was
triggering an actual inf loop (by not ever canceller the streamer child
actor), make sure we put a loop limit on the `inf_streamer`()` XD
Also add a bit more deats to the test `print()`s in each actor and toss
in `debug_mode` fixture support.
Besides improving a bunch more log msg contents similarly as before this
changes the cancel method signatures slightly with different arg names:
for `.cancel()`:
- instead of `requesting_uid: str` take in a `req_chan: Channel`
since we can always just read its `.uid: tuple` for logging and
further we can then offer the `chan=None` case indicating a
"self cancel" (since there's no "requesting channel").
- the semantics of "requesting" here better indicate that the IPC connection
is an IPC peer and further (eventually) will allow permission checking
against given peers for cancellation requests.
- when `chan==None` we also define a meth-internal `requester_type: str`
differently for logging content :)
- add much more detailed `.cancel()` content around the requester, its
type, and any debugger related locking steps.
for `._cancel_task()`:
- change the `chan` arg to `parent_chan: Channel` since "parent"
correctly indicates that the channel is the parent of the locally
spawned rpc task to cancel; in fact no other chan should be able to
cancel tasks parented/spawned by other channels obvi!
- also add more extensive meth-internal `.cancel()` logging with a #TODO
around showing only the "relevant/lasest" `Context` state vars in such
logging content.
for `.cancel_rpc_tasks()`:
- shorten `requesting_uid` -> `req_uid`.
- add `parent_chan: Channel` to be similar as above in `._cancel_task()`
(since it's internally delegated to anyway) which replaces the prior
`only_chan` and use it to filter to only tasks spawned by this channel
(thus as their "parent") as before.
- instead of `if tasks:` to enter, invert and `return` early on
`if not tasks`, for less indentation B)
- add WIP str-repr format (for `.cancel()` emissions) to show
a multi-address (maddr) + task func (via the new `Context._nsf`) and
report all cancel task targets with it a "tree"; include #TODO to
finalize and implement some utils for all this!
To match ensure we adjust `process_messages()` self/`Actor` cancel
handling blocks to provide the new `kwargs` (now with `dict`-merge
syntax) to `._invoke()`.
Turns out that py3.11 might be so fast that iterating a EoC-ed
`MsgStream` 1k times is faster then a `Context.cancel()` msg
transmission from a parent actor to it's child (which i guess makes
sense). So tweak the test to delay 5ms between stream async-for iteration
attempts when the stream is detected to be `.closed: bool` (coming in
patch) or `ctx.cancel_called == true`.
Such that you see the children entries prior to exit instead of the
prior somewhat detail/use-less logging. Also, rename all `anursery` vars
to just `an` as is the convention in most examples.
Since that's what we're now doing in `MsgStream._eoc` internal
assignments (coming in future patch), do the same in this exception
re-raise-helper and include more extensive doc string detailing all
the msg-type-to-raised-error cases. Also expose a `hide_tb: bool` like
we have already in `unpack_error()`.
As similarly improved in other parts of the runtime, adds much more
pedantic (`.cancel()`) logging content to indicate the src of remote
cancellation request particularly for `Actor.cancel()` and
`._cancel_task()` cases prior to `._invoke()` task scheduling. Also add
detailed case comments and much more info to the
"request-to-cancel-already-terminated-RPC-task" log emission to include
the `Channel` and `Context.cid` deats.
This helped me find the src of a race condition causing a test to fail
where a callee ctx task was returning a result *before* an expected
`ctx.cancel()` request arrived B). Adding much more pedantic
`.cancel()` msg contents around the requester's deats should ensure
these cases are much easier to detect going forward!
Also, simplify the `._invoke()` final result/error log msg to only put
*one of either* the final error or returned result above the `Context`
pprint.
The only case where we can't is in `Portal.run_from_ns()` usage (since we
pass a path with `self:<Actor.meth>`) and because `.to_tuple()`
internally uses `.load_ref()` which will of course fail on such a path..
So or now impl as,
- mk `Actor.start_remote_task()` take a `nsf: NamespacePath` but also
offer a `load_nsf: bool = False` such that by default we bypass ref
loading (maybe this is fine for perf long run as well?) for the
`Actor`/'self:'` case mentioned above.
- mk `.get_context()` take an instance `nsf` obvi.
More logging msg format tweaks:
- change msg-flow related content to show the `Context._nsf`, which,
right, is coming follow up commit..
- bunch more `.runtime()` format updates to show `msg: dict` contents
and internal primitives with trailing `'\n'` for easier reading.
- report import loading `stackscope` in subactors.
Such that with `--tpdb` passed (sub)actors will engage the `pdbp` REPL
automatically and so that we can use the new `stackscope` support when
complex cases hang Bo
Also,
- simplified some type-annots (ns paths),
- doc-ed an inter-peer test func with some ascii msg flows,
- added a bottom #TODO for replicating the scenario i hit in `modden`
where a separate client actor-tree was hanging on cancelling a `bigd`
sub-workspace..
Given i just similarly revamped a buncha `._runtime` log msg formatting,
might as well do something similar inside the spawning machinery such
that groking teardown sequences of each supervising task is much more
sane XD
Mostly this includes doing similar `'<field>: <value>\n'` multi-line
formatting when reporting various subproc supervision steps as well as
showing a detailed `trio.Process.__repr__()` as appropriate.
Also adds a detailed #TODO according to the needs of #320 for which
we're going to need some internal mechanism for intermediary parent
actors to determine if a given debug tty locker (sub-actor) is one of
*their* (transitive) children and thus stall the normal
cancellation/teardown sequence until that locker is complete.
As part of solving some final edge cases todo with inter-peer remote
cancellation (particularly a remote cancel from a separate actor
tree-client hanging on the request side in `modden`..) I needed less
dense, more line-delimited log msg formats when understanding ipc
channel and context cancels from console logging; this adds a ton of
that to:
- `._invoke()` which now does,
- better formatting of `Context`-task info as multi-line
`'<field>: <value>\n'` messages,
- use of `trio.Task` (from `.lowlevel.current_task()` for full
rpc-func namespace-path info,
- better "msg flow annotations" with `<=` for understanding
`ContextCancelled` flow.
- `Actor._stream_handler()` where in we break down IPC peers reporting
better as multi-line `|_<Channel>` log msgs instead of all jammed on
one line..
- `._ipc.Channel.send()` use `pformat()` for repr of packet.
Also tweak some optional deps imports for debug mode:
- add `maybe_import_gb()` for attempting to import `greenback`.
- maybe enable `stackscope` tree pprinter on `SIGUSR1` if installed.
Add a further stale-debugger-lock guard before removal:
- read the `._debug.Lock.global_actor_in_debug: tuple` uid and possibly
`maybe_wait_for_debugger()` when the child-user is known to have
a live process in our tree.
- only cancel `Lock._root_local_task_cs_in_debug: CancelScope` when
the disconnected channel maps to the `Lock.global_actor_in_debug`,
though not sure this is correct yet?
Started adding missing type annots in sections that were modified.
Since it's generally useful to know who is the cause of an overrun (say
bc you want your system to then adjust the writer side to slow tf down)
might as well pack an extra `.sender: tuple[str, str]` actor uid field
which can be relayed through `RemoteActorError` boxing. Add an extra
case for the exc-type to `unpack_error()` to match B)
Since we use basically the exact same set of logic in
`Portal.open_context()` when expecting the first `'started'` msg factor
and generalize `._streaming._raise_from_no_yield_msg()` into a new
`._exceptions._raise_from_no_key_in_msg()` (as per the lingering todo)
which obvi requires a more generalized / optional signature including
a caller specific `log` obj. Obvi call the new func from all the other
modules X)
Apparently (and i don't know if this was always broken [i feel like no?]
or is a recent change to stdlib's `logging` stuff) we need increment the
`stacklevel` input by one for our custom level methods now? Without this
you're going to see the path to the method's-callstack-frame on every
emission instead of to the caller's. I first noticed this when debugging
the workspace layer spawning in `modden.bigd` and then verified it in
other depended projects..
I guess we should add some tests for this as well XD
Took me longer then i wanted to figure out the source of
a failed-response to a remote-cancellation (in this case in `modden`
where a client was cancelling a workspace layer.. but disconnects before
receiving the ack msg) that was triggering an IPC error when sending the
error msg for the cancellation of a `Actor._cancel_task()`, but since
this (non-rpc) `._invoke()` task was trying to send to a now
disconnected canceller it was resulting in a `BrokenPipeError` (or similar)
error.
Now, we except for such IPC errors and only raise them when,
1. the transport `Channel` is for sure up (bc ow what's the point of
trying to send an error on the thing that caused it..)
2. it's definitely for handling an RPC task
Similarly if the entire main invoke `try:` excepts,
- we only hide the call-stack frame from the debugger (with
`__tracebackhide__: bool`) if it's an RPC task that has a connected
channel since we always want to see the frame when debugging internal
task or IPC failures.
- we don't bother trying to send errors to the context caller (actor)
when it's a non-RPC request since failures on actor-runtime-internal
tasks shouldn't really ever be reported remotely, only maybe raised
locally.
Also some other tidying,
- this properly corrects for the self-cancel case where an RPC context
is cancelled due to a local (runtime) task calling a method like
`Actor.cancel_soon()`. We now set our own `.uid` as the
`ContextCancelled.canceller` value so that other-end tasks know that
the cancellation was due to a self-cancellation by the actor itself.
We still need to properly test for this though!
- add a more detailed module doc-str.
- more explicit imports for `trio` core types throughout.
Drop all the nested `@acm` blocks and defunct comments from initial
validations. Add some todos for cases that are still unclear such as
whether the caller / streamer should have `.cancelled_caught == True` in
it's teardown.
We can now make asserts on `.cancelled_caught` and `_remote_error` vs.
`_local_error`. Expect a runtime error when `Context.open_stream()` is
called AFTER `.cancel()` and the remote `ContextCancelled` hasn't
arrived (yet). Adjust to `'itself'` string in self-cancel case.
This took way too long to get right but hopefully will give us grok-able
and correct context exit semantics going forward B)
The main fixes were:
- always shielding the `MsgStream.aclose()` call on teardown to avoid
bubbling a `Cancelled`.
- properly absorbing any `ContextCancelled` in cases due to "self
cancellation" using the new `Context.canceller` in the logic.
- capturing any error raised by the `Context.result()` call in the
"normal exit, result received" case and setting it as the
`Context._local_error` so that self-cancels can be easily measured via
`Context.cancelled_caught` in same way as remote-error caused
cancellations.
- extremely detailed comments around all of the cancellation-error cases
to avoid ever getting confused about the control flow in the future XD
As part of extremely detailed inter-peer-actor testing, add much more
granular `Context` cancellation state tracking via the following (new)
fields:
- `.canceller: tuple[str, str]` the uuid of the actor responsible for
the cancellation condition - always set by
`Context._maybe_cancel_and_set_remote_error()` and replaces
`._cancelled_remote` and `.cancel_called_remote`. If set, this value
should normally always match a value from some `ContextCancelled`
raised or caught by one side of the context.
- `._local_error` which is always set to the locally raised (and caller
or callee task's scope-internal) error which caused any
eventual cancellation/error condition and thus any closure of the
context's per-task-side-`trio.Nursery`.
- `.cancelled_caught: bool` is now always `True` whenever the local task
catches (or "silently absorbs") a `ContextCancelled` (a `ctxc`) that
indeed originated from one of the context's linked tasks or any other
context which raised its own `ctxc` in the current `.open_context()` scope.
=> whenever there is a case that no `ContextCancelled` was raised
**in** the `.open_context().__aexit__()` (eg. `ctx.result()` called
after a call `ctx.cancel()`), we still consider the context's as
having "caught a cancellation" since the `ctxc` was indeed silently
handled by the cancel requester; all other error cases are already
represented by mirroring the state of the `._scope: trio.CancelScope`
=> IOW there should be **no case** where an error is **not raised** in
the context's scope and `.cancelled_caught: bool == False`, i.e. no
case where `._scope.cancelled_caught == False and ._local_error is not
None`!
- always raise any `ctxc` from `.open_stream()` if `._cancel_called ==
True` - if the cancellation request has not already resulted in
a `._remote_error: ContextCancelled` we raise a `RuntimeError` to
indicate improper usage to the guilty side's task code.
- make `._maybe_raise_remote_err()` a sync func and don't raise
any `ctxc` which is matched against a `.canceller` determined to
be the current actor, aka a "self cancel", and always set the
`._local_error` to any such `ctxc`.
- `.side: str` taken from inside `.cancel()` and unused as of now since
it might be better re-written as a similar `.is_opener() -> bool`?
- drop unused `._started_received: bool`..
- TONS and TONS of detailed comments/docs to attempt to explain all the
possible cancellation/exit cases and how they should exhibit as either
silent closes or raises from the `Context` API!
Adjust the `._runtime._invoke()` code to match:
- use `ctx._maybe_raise_remote_err()` in `._invoke()`.
- adjust to new `.canceller` property.
- more type hints.
- better `log.cancel()` msging around self-cancels vs. peer-cancels.
- always set the `._local_error: BaseException` for the "callee" task
just like `Portal.open_context()` now will do B)
Prior we were raising any `Context._remote_error` directly and doing
(more or less) the same `ContextCancelled` "absorbing" logic (well
kinda) in block; instead delegate to the method
Tests that appropriate `Context` exit state, the relay of
a `ContextCancelled` error and its `.canceller: tuple[str, str]` value
are set when an inter-peer cancellation happens via an "out of band"
request method (in this case using `Portal.cancel_actor()` and that
cancellation is propagated "horizontally" to other peers. Verify that
any such cancellation scenario which also experiences an "error during
`ContextCancelled` handling" DOES NOT result in that further error being
suppressed and that the user's exception bubbles out of the
`Context.open_context()` block(s) appropriately!
Likely more tests to come as well as some factoring of the teardown
state checks where possible.
Pertains to serious testing the major work landing in #357
Specifically in the `.__aexit__()` phase to ensure remote,
runtime-internal, and locally raised error-during-cancelled-handling
exceptions are NEVER masked by a local `ContextCancelled` or any
exception group of `trio.Cancelled`s.
Also adds a ton of details to doc strings including extreme detail
surrounding the `ContextCancelled` raising cases and their processing
inside `.open_context()`'s exception handler blocks.
Details, details:
- internal rename `err`/`_err` stuff to just be `scope_err` since it's
effectively the error bubbled up from the context's surrounding (and
cross-actor) "scope".
- always shield `._recv_chan.aclose()` to avoid any `Cancelled` from
masking the `scope_err` with a runtime related `trio.Cancelled`.
- explicitly catch the specific set of `scope_err: BaseException` that
we can reasonably expect to handle instead of the catch-all parent
type including exception groups, cancels and KBIs.
Well first off, turns out it's never used and generally speaking
doesn't seem to help much with "runtime hacking/debugging"; why would
we need to "fabricate" a msg when `.cancel()` is called to self-cancel?
Also (and since `._maybe_cancel_and_set_remote_error()` now takes an
`error: BaseException` as input and thus expects error-msg unpacking
prior to being called), we now manually set `Context._cancel_msg: dict`
just prior to any remote error assignment - so any case where we would
have fabbed a "cancel msg" near calling `.cancel()`, just do the manual
assign.
In this vein some other subtle changes:
- obviously don't set `._cancel_msg` in `.cancel()` since it's no longer
an input.
- generally do walrus-style `error := unpack_error()` before applying
and setting remote error-msg state.
- always raise any `._remote_error` in `.result()` instead of returning
the exception instance and check before AND after the underlying mem
chan read.
- add notes/todos around `raise self._remote_error from None` masking of
(runtime) errors in `._maybe_raise_remote_err()` and use it inside
`.result()` since we had the inverse duplicate logic there anyway..
Further, this adds and extends a ton of (internal) interface docs and
details comments around the `Context` API including many subtleties
pertaining to calling `._maybe_cancel_and_set_remote_error()`.
Bump type annotations to 3.10+ style throughout module as well as fill
out doc strings a bit. Inside `unpack_error()` pop any `error_dict: dict`
and,
- return `None` early if not found,
- versus pass directly as `**error_dict` to the error constructor
instead of a double field read.
Since both `MsgStream.receive()` and `.receive_nowait()` need the same
raising logic when a non-stream msg arrives (so that maybe an
appropriate IPC translated error can be raised) move the `KeyError`
handler code into a new `._streaming._raise_from_no_yield_msg()` func
and call it from both methods to make the error-interface-raising
symmetrical across both methods.
Previously we weren't raising a remote error if the local scope was
cancelled during a call to `Context.result()` which is problematic if
the caller WAS NOT the requester for said remote cancellation; in that
case we still want a `ContextCancelled` raised with the `.canceller:
str` set to the cancelling actor uid.
Further fix a naming bug where the (seemingly older) `._remote_err` was
being set to such an error instead of `._remote_error` XD
Move over relevant test from the "context semantics" test module which
was already verifying peer-caused-`ContextCancelled.canceller: tuple`
error info and propagation during an inter-peer cancellation scenario.
Also begin a more general set of inter-peer cancellation tests starting
with the simplest case where when a peer is cancelled the parent should
NOT get an "muted" `trio.Cancelled` and instead
a `tractor.ContextCancelled` with a `.canceller: tuple` which points to
the sibling actor which requested the peer cancel.
We were using a `all(<yielded values>)` condition which obviously won't
work if the batched managers yield any non-truthy value. So instead see
the `unwrapped: dict` with the `id(mngrs)` and only unblock once all
values have been filled in to be something that is not that value.
Detect if the input ref is a non-func (like an `object` instance) in
which case grab its type name using `type()`. Wrap all the name-getting
into a new `_mk_fqpn()` static meth: gets the "fully qualified path
name" and returns path and name in tuple; port other methds to use it.
Refine and update the docs B)
- `Context._cancel_called_remote` -> `._cancelled_remote` since "called"
implies the cancellation was "requested" when it could be due to
another error and the actor uid is the value - only set once the far
end task scope is terminated due to either error or cancel, which has
nothing to do with *what* caused the cancellation.
- `Actor._cancel_called_remote` -> `._cancel_called_by_remote` which
emphasizes that this variable is **only set** IFF some remote actor
**requested that** this actor's runtime be cancelled via
`Actor.cancel()`.
Turns out you can get a case where you might be opening multiple
ctx-streams concurrently and during the context opening phase you block
for all contexts to open, but then when you eventually start opening
streams some slow to start context has caused the others become in an
overrun state.. so we need to let the caller control whether that's an
error ;)
This also needs a test!
Because obviously we probably want to support `allow_overruns` on the
remote callee side as well XD
Only found the bugs fixed in this patch this thanks to writing a much
more exhaustive test set for overrun cases B)
This actually caught further runtime bugs so it's gud i tried..
Add overrun-ignore enabled / disabled cases and error catching for all
of them. More or less this should cover every possible outcome when
it comes to setting `allow_overruns: bool` i hope XD
This adds remote cancellation semantics to our `tractor.Context`
machinery to more closely match that of `trio.CancelScope` but
with operational differences to handle the nature of parallel tasks interoperating
across multiple memory boundaries:
- if an actor task cancels some context it has opened via
`Context.cancel()`, the remote (scope linked) task will be cancelled
using the normal `CancelScope` semantics of `trio` meaning the remote
cancel scope surrounding the far side task is cancelled and
`trio.Cancelled`s are expected to be raised in that scope as per
normal `trio` operation, and in the case where no error is raised
in that remote scope, a `ContextCancelled` error is raised inside the
runtime machinery and relayed back to the opener/caller side of the
context.
- if any actor task cancels a full remote actor runtime using
`Portal.cancel_actor()` the same semantics as above apply except every
other remote actor task which also has an open context with the actor
which was cancelled will also be sent a `ContextCancelled` **but**
with the `.canceller` field set to the uid of the original cancel
requesting actor.
This changeset also includes a more "proper" solution to the issue of
"allowing overruns" during streaming without attempting to implement any
form of IPC streaming backpressure. Implementing task-granularity
backpressure cross-process turns out to be more or less impossible
without augmenting out streaming protocol (likely at the cost of
performance). Further allowing overruns requires special care since
any blocking of the runtime RPC msg loop task effectively can block
control msgs such as cancels and stream terminations.
The implementation details per abstraction layer are as follows.
._streaming.Context:
- add a new contructor factor func `mk_context()` which provides
a strictly private init-er whilst allowing us to not have to define
an `.__init__()` on the type def.
- add public `.cancel_called` and `.cancel_called_remote` properties.
- general rename of what was the internal `._backpressure` var to
`._allow_overruns: bool`.
- move the old contents of `Actor._push_result()` into a new
`._deliver_msg()` allowing for better encapsulation of per-ctx
msg handling.
- always check for received 'error' msgs and process them with the new
`_maybe_cancel_and_set_remote_error()` **before** any msg delivery to
the local task, thus guaranteeing error and cancellation handling
despite any overflow handling.
- add a new `._drain_overflows()` task-method for use with new
`._allow_overruns: bool = True` mode.
- add back a `._scope_nursery: trio.Nursery` (allocated in
`Portal.open_context()`) who's sole purpose is to spawn a single task
which runs the above method; anything else is an error.
- augment `._deliver_msg()` to start a task and run the above method
when operating in no overrun mode; the task queues overflow msgs and
attempts to send them to the underlying mem chan using a blocking
`.send()` call.
- on context exit, any existing "drainer task" will be cancelled and
remaining overflow queued msgs are discarded with a warning.
- rename `._error` -> `_remote_error` and set it in a new method
`_maybe_cancel_and_set_remote_error()` which is called before
processing
- adjust `.result()` to always call `._maybe_raise_remote_err()` at its
start such that whenever a `ContextCancelled` arrives we do logic for
whether or not to immediately raise that error or ignore it due to the
current actor being the one who requested the cancel, by checking the
error's `.canceller` field.
- set the default value of `._result` to be `id(Context()` thus avoiding
conflict with any `.result()` actually being `False`..
._runtime.Actor:
- augment `.cancel()` and `._cancel_task()` and `.cancel_rpc_tasks()` to
take a `requesting_uid: tuple` indicating the source actor of every
cancellation request.
- pass through the new `Context._allow_overruns` through `.get_context()`
- call the new `Context._deliver_msg()` from `._push_result()` (since
the factoring out that method's contents).
._runtime._invoke:
- `TastStatus.started()` back a `Context` (unless an error is raised)
instead of the cancel scope to make it easy to set/get state on that
context for the purposes of cancellation and remote error relay.
- always raise any remote error via `Context._maybe_raise_remote_err()`
before doing any `ContextCancelled` logic.
- assign any `Context._cancel_called_remote` set by the `requesting_uid`
cancel methods (mentioned above) to the `ContextCancelled.canceller`.
._runtime.process_messages:
- always pass a `requesting_uid: tuple` to `Actor.cancel()` and
`._cancel_task` to that any corresponding `ContextCancelled.canceller`
can be set inside `._invoke()`.
Turns out stuff was totally broken in these cases because we're either
closing the underlying mem chan too early or not handling the
"allow_overruns" mode's cancellation correctly..
To handle both remote cancellation this adds `ContextCanceled.canceller:
tuple` the uid of the cancel requesting actor and is expected to be set
by the runtime when servicing any remote cancel request. This makes it
possible for `ContextCancelled` receivers to know whether "their actor
runtime" is the source of the cancellation.
Also add an explicit `RemoteActor.src_actor_uid` which better formalizes
the notion of "which remote actor" the error originated from.
Both of these new attrs are expected to be packed in the `.msgdata` when
the errors are loaded locally.
These will verify new changes to the runtime/messaging core which allows
us to adopt an "ignore cancel if requested by us" style handling of
`ContextCancelled` more like how `trio` does with
`trio.Nursery.cancel_scope.cancel()`. We now expect
a `ContextCancelled.canceller: tuple` which is set to the actor uid of
the actor which requested the cancellation which eventually resulted in
the remote error-msg.
Also adds some experimental tweaks to the "backpressure" test which it
turns out is very problematic in coordination with context cancellation
since blocking on the feed mem chan to some task will block the ipc msg
loop and thus handling of cancellation.. More to come to both the test
and core to address this hopefully since right now this test is failing.
Previously we were leaking our (pdb++) override into the Python runtime
which would always result in a runtime error whenever `breakpoint()` is
called outside our runtime; after exit of the root actor . This
explicitly restores any previous hook override (detected during startup)
or deletes the hook and restores the environment if none existed prior.
Also adds a new WIP debugging example script to ensure breakpointing
works as normal after runtime close; this will be added to the test
suite.
Makes the broadcast test suite not hang xD, and is our expected default
behaviour. Also removes a ton of commented legacy cruft from before the
refactor to remove the `.receive()` recursion and fixes some typing.
Oh right, and in the case where there's only one subscriber left we warn
log about it since in theory we could actually entirely unwind the
bcaster back to the original underlying, though not sure if that's sane
or works for some use cases (like wanting to have some other subscriber
get added dynamically later).
Since one-way streaming can be accomplished by just *not* sending on one
side (and/or thus wrapping such usage in a more restrictive API), we
just drop the recv-only parent type. The only method different was
`MsgStream.send()`, now merged in. Further in usage of `.subscribe()`
we monkey patch the underlying stream's `.send()` onto the delivered
broadcast receiver so that subscriber tasks can two-way stream as though
using the stream directly.
This allows us to more definitively drop `tractor.open_stream_from()` in
the longer run if we so choose as well; note currently this will
potentially create an issue if a caller tries to `.send()` on such a one
way stream.
Driven by a bug found in `piker` where we'd get an inf recursion error
due to `BroadcastReceiver.receive()` being called when consumer tasks
are awoken but no value is ready to `.nowait_receive()`.
This new rework takes an approach closer to the interface and internals
of `trio.MemoryReceiveChannel` particularly in terms of,
- implementing a `BroadcastReceiver.receive_nowait()` and using it
within the async `.receive()`.
- failing over to an internal `._receive_from_underlying()` when the
`_nowait()` call raises `trio.WouldBlock`.
- adding `BroadcastState.statistics()` for debugging and testing
dropping recursion from `.receive()`.
We weren't doing this originally I *think* just because of the path
dependent nature of the way the code was developed (originally being
mega pedantic about one-way vs. bidirectional streams) but, it doesn't
seem like there's any issue just calling the stream's `.aclose()`; also
have the benefit of just being less code and logic checks B)
With the new fancy `_pytest.pathlib.import_path()` we can do real
parametrization of the example-script-module code and thus configure
whether the child, parent, or both silently break the IPC connection.
Parametrize the test for all the above mentioned cases as well as the
case where the IPC never breaks but we still simulate the user hammering
ctl-c / SIGINT to terminate the actor tree. Adjust expected errors based
on each case and heavily document each of these.
Use a task nursery in the subactor to spawn tasks which cancel the IPC
channel mid stream to simulate the most concurrent case we're likely to
see. Make `main()` accept a `debug_mode: bool` for parametrization. Fill
out detailed comments/docs on this example.
When backpressure is used and a feeder mem chan breaks during msg
delivery (usually because the IPC allocating task already terminated)
instead of raising we simply warn as we do for the non-backpressure
case.
Also, add a proper `Actor.is_arbiter` test inside `._invoke()` to avoid
doing an arbiter-registry lookup if the current actor **is** the
registrar.
The stdlib has all sorts of muckery with ignoring SIGINT in the
`Pdb._cmdloop()` but here we just override all that since we don't trust
their decisions about cancellation handling whatsoever. Adds
a `Lock.repl: MultiActorPdb` attr which is set by any task which
acquires root TTY lock indicating (via actor global state) that the
current actor is using the debugger REPL and can be expected to re-draw
the prompt on SIGINT. Further we mask out log messages from any actor
who also has the `shield_sigint_handler()` enabled to avoid logging
noise when debugging.
If we pack the nursery parent task's error into the `errors` table
directly in the handler, we don't need to specially handle packing that
same error into any exception group raised while handling sub-actor
cancellation; drops some ugly indentation ;)
Pretty sure this is the final touch to alleviate all our debug lock
headaches! Instead of trying to revert to the "last" handler (as `pdb`
does internally in the stdlib) we always just revert to the handler
`trio` registers during startup. Further this seems to allow cancelling
the root-side locking task if it's detected as stale IFF we only do this
when the root actor is in a "no more IPC peers" state.
Deatz:
- (always) set `._debug.Lock._trio_handler` as the `trio` version, not
some last used handler to make sure we're getting the ctrl-c handling
we want when not in debug mode.
- assign the trio handler in `open_root_actor()`
`._runtime._async_main()` to be sure it's applied in subactors as well
as the root.
- only do debug lock blocking and root-side-locking-task cancels when
a "no peers" condition is detected in the root actor: i.e. no IPC
channels are detected by the root meaning it's impossible any actor
has a sane lock-state ongoing for debug mode.
Turns out this test was being silently ignored due to incorrect usage of
sync opening of our `.open_nursery()` block (with a `with` not `async
with`) and thus was an noop XD
Instead this fixes the test to call a `tractor` discovery built-in
without starting the runtime (which is now done implicitly when a user
opens a nursery) which should result in the prior expected outcome,
a `RuntimeError`.
This is a lingering debugger locking race case we needed to handle:
- child crashes acquires TTY lock in root and attaches to `pdb`
- child IPC goes down such that all channels to the root are broken
/ non-functional.
- root is stuck thinking the child is still in debug even though it
can't be contacted and the child actor machinery hasn't been
cancelled by its parent.
- root get's stuck in deadlock with child since it won't send a cancel
request until the child is finished debugging, but the child can't
unlock the debugger bc IPC is down.
To avoid this scenario add debug lock blocking list via
`._debug.Lock._blocked: set[tuple]` which holds actor uids for any actor
that is detected by the root as having no transport channel connections
with said root (of which at least one should exist if this sub-actor at
some point acquired the debug lock). The root consequently checks this
list for any actor that tries to (re)acquire the lock and blocks with
a `ContextCancelled`. When a debug condition is tested in
`._runtime._invoke` the context's `._enter_debugger_on_cancel` which
is set to `False` if the actor is on the block list in which case the
post-mortem entry is skipped.
Further this adds a root-locking-task side cancel scope to
`Lock._root_local_task_cs_in_debug` which can be cancelled by the root
runtime when a stale lock is detected after all IPC channels for the
actor have been torn down. NOTE: right now we're NOT doing this since it
seems to cause test failures likely due because it may cause pre-mature
cancellation and maybe needs a bit more experimenting?
In the case of a callee-side context cancelling itself it can be handy
to let the caller-side task know (even if through logging) that the
cancel was due to some known reason. Make `.cancel()` accept such
a message on the callee side and have it included in the
`._runtime._invoke()` raised `ContextCancelled` emission.
Also add a `Context._trigger_debugger_on_cancel: bool` flag which can be
set to `False` to avoid the debugger post-mortem crash mode from
engaging on cross-context tasks which cancel themselves for a known
reason (as is needed for blocked tasks in the debug TTY-lock machinery).
Turns out the lifetime mgmt of separate nurseries per delegate manager
is tricky; a new nursery can't be naively allocated on cache-misses since
it may get closed by some early terminating task instead of by the "last
using" consumer task. In theory if we allocate using the same logic as
that used for the last-task-triggers-exit then this should work?
For now just go back to a single global nursery per `_Cache` which still
avoids use of the internal actor service nursery.
Instead of sticking all `trionics.maybe_open_context()` tasks inside the
actor's (root) service nursery, open a unique one per manager function
instance (id).
Further, accept a callable for the `key` such that a user can have
more flexible control on the caching logic and move the
`maybe_open_nursery()` helper out of the portal mod and into this
trionics "managers" module.
Instead of the logic branching create a table `._spawn._methods`
which is used to lookup the desired backend framework (in this case
still only one of `multiprocessing` or `trio`) and make the top level
`.new_proc()` do the lookup and any common logic. Use a `typing.Literal`
to define the lookup table's key set.
Repair and ignore a bunch of type-annot related stuff todo with `mypy`
updates and backend-specific process typing.
After many tries I just don't think it's worth it to make the tests work
since the repl UX in `pdbpp` is so unreliable in the latest release and
honestly we're trying to go 3.10+ ASAP.
Further,
- entirely drop the pattern matching inside the `do_ctlc()` for now.
- add a `subactor_error` parametrization that catches a case that
previously caused a hang (when you use 'next' immediately after the
first crash/debug lock (the fix was pushed just before this commit).
The common logic to both remove our custom SIGINT handler as well
as signal the actor global event that pdb is complete. Call this
whenever we exit a post mortem call and thus any time some rpc task
get's debugged inside `._actor._invoke()`.
Further, we have to manually print the REPL prompt on 3.9 for some wack
reason, so stick a version guard in the sigint handler for that..
When in an uncertain teardown state and in debug mode a context can be
popped from actor runtime before a child finished debugging (the case
when the parent is tearing down but the child hasn't closed/completed
its tty lock IPC exit phase) and the child sends the "stop" message to
unlock the debugger but it's ignored bc the parent has already dropped
the ctx. Instead we call `._debug.maybe_wait_for_deugger()` before these
context removals to avoid the root getting stuck thinking the lock was
never released.
Further, add special `Actor._cancel_task()` handling code inside
`_invoke()` which continues to execute the method despite the IPC
channel to the caller being broken and thus avoiding potential hangs due
to a target (child) actor task remaining alive.
Ensure that even when `pdb` resumption methods are called during a crash
where `trio`'s runtime has already terminated (eg. `Event.set()` will
raise) we always revert our sigint handler to the original. Further
inside the handler if we hit a case where a child is in debug and
(thinks it) has the global pdb lock, if it has no IPC connection to
a parent, simply presume tty sync-coordination is now lost and cancel
the child immediately.
A hopefully significant fix here is to always avoid suppressing a SIGINT
when the root actor can not detect an active IPC connections (via
a connected channel) to the supposed debug lock holding actor. In that
case it is most likely that the actor has either terminated or has lost
its connection for debugger control and there is no way the root can
verify the lock is in use; thus we choose to allow KBI cancellation.
Drop the (by comment) `try`-`finally` block in
`_hijoack_stdin_for_child()` around the `_acquire_debug_lock()` call
since all that logic should now be handled internal to that locking
manager. Try to catch a weird error around the `.do_longlist()` method
call that seems to sometimes break on py3.10 and latest `pdbpp`.
The method now returns a `bool` which flags whether the transport died
to the caller and allows for reporting a disconnect in the
channel-transport handler task. This is something a user will normally
want to know about on the caller side especially after seeing
a traceback from the peer (if in tree) on console.
There's no point in sending a cancel message to the remote linked task
and especially no reason to block waiting on a result from that task if
the transport layer is detected to be disconnected. We expect that the
transport shouldn't go down at the layer of the message loop
(reconnection logic should be handled in the transport layer itself) so
if we detect the channel is not connected we don't bother requesting
cancels nor waiting on a final result message.
Why?
- if the connection goes down in error the caller side won't have a way
to know "how long" it should block to wait for a cancel ack or result
and causes a potential hang that may require an additional ctrl-c from
the user especially if using the debugger or if the traceback is not
seen on console.
- obviously there's no point in waiting for messages when there's no
transport to deliver them XD
Further, add some more detailed cancel logging detailing the task and
actor ids.
There's a bug that's triggered in the stdlib without latest `pdb++`
installed; add a note for that.
Further inside `wait_for_parent_stdin_hijack()` don't `.started()` until
the interactor stream has been opened to avoid races when debugging this
`._debug.py` module (at the least) since we usually don't want the
spawning (parent) task to resume until we know for sure the tty lock has
been acquired. Also, drop the random checkpoint we had inside
`_breakpoint()`, not sure it was actually adding anything useful since
we're (mostly) carefully shielded throughout this func.
Finally! I think this may be the root issue we've been seeing in
production in a client project.
No idea yet why this is happening but the fault-causing sequence seems
to be:
- `.open_context()` in a child actor
- enter the debugger via `tractor.breakpoint()`
- continue from that entry via `c` command in REPL
- raise an error just after inside the context task's body
Looking at logging it appears as though the child thinks it has the tty
but no input is accepted on the REPL and a further `ctrl-c` results in
some teardown but also a further hang where both parent and child become
unresponsive..
None of it worked (you still will see `.__exit__()` frames on debugger
entry - you'd think this would have been solved by now but, shrug) so
instead wrap the debugger entry-point in a `try:` and put the SIGINT
handler restoration inside `MultiActorPdb` teardown hooks.
This seems to restore the UX as it was prior but with also giving the
desired SIGINT override handler behaviour.
Using either of `@pdb.hideframe` or `__tracebackhide__` on stdlib
methods doesn't seem to work either.. This all seems to have something
to do with async generator usage I think ?
This gets very close to avoiding any possible hangs to do with tty
locking and SIGINT handling minus a special case that will be detailed
below.
Summary of implementation changes:
- convert `_mk_pdb()` -> `with _open_pdb() as pdb:` which implicitly
handles the `bdb.BdbQuit` case such that debugger teardown hooks are
always called.
- rename the handler to `shield_sigint()` and handle a variety of new
cases:
* the root is in debug but hasn't been cancelled -> call
`Actor.cancel_soon()`
* the root is in debug but *has* been called (`Actor.cancel_soon()`
already called) -> raise KBI
* a child is in debug *and* has a task locking the debugger -> ignore
SIGINT in child *and* the root actor.
- if the debugger instance is provided to the handler at acquire time,
on SIGINT handling completion re-print the last pdb++ REPL output so
that the user realizes they are still actively in debug.
- ignore the unlock case where a race condition of "no task" holding the
lock causes the `RuntimeError` normally associated with the "wrong
task" doing so (not sure if this is a `trio` bug?).
- change debug logs to runtime level.
Unhandled case(s):
- a child is maybe in debug mode but does not itself have any task using
the debugger.
* ToDo: we need a way to decide what to do with
"intermediate" child actors who themselves either are not in
`debug_mode=True` but have children who *are* such that a SIGINT
won't cause cancellation of that child-as-parent-of-another-child
**iff** any of their children are in in debug mode.
This fixes an previously undetected bug where if an
`.open_channel_from()` spawned task errored the error would not be
propagated to the `trio` side and instead would fail silently with
a console log error. What was most odd is that it only seems easy to
trigger when you put a slight task sleep before the error is raised
(:eyeroll:). This patch adds a few things to address this and just in
general improve iter-task lifetime syncing:
- add `LinkedTaskChannel._trio_exited: bool` a flag set from the `trio`
side when the channel block exits.
- add a `wait_on_aio_task: bool` flag to `translate_aio_errors` which
toggles whether to wait the `asyncio` task termination event on exit.
- cancel the `asyncio` task if the trio side has ended, when
`._trio_exited == True`.
- always close the `trio` mem channel when the task exits such that
the `asyncio` side can error on any next `.send()` call.
Sometimes it's handy to just have a non-`Portal` yielding way
to figure out if a "service" actor is up, so add this discovery
helper for that. We'll prolly just leave it undocumented for
now until we figure out a longer-term/better discovery system.
When an `asyncio` side task errors or is cancelled we now explicitly
report the traceback and task name if possible as well as the source
reason for the error (some come from the `trio` side).
Further, properly set any `trio` side exception (after unwrapping it
from the `outcome.Error`) on the future that runs the `trio` guest run.
Python 3.9's new object resolver + a `str` is much simpler then mucking
with tuples (and easier to serialize). Include a `.to_tuple()` formatter
since we still are passing the module namespace and function name
separately inside the runtime's message format but in theory we might be
able to simplify this depending on how we would change the support for
`enable_modules:list[str]` in the spawn API.
Thanks to @Fuyukai for pointing `resolve_name()` which I didn't know
about before!
Adjust the `soft_wait()` strategy to avoid sending needless cancel
requests if it is known that a child process is already terminated or
does so before the cancel request times out. This should be no slower
and should avoid needless waits on either closure-in-progress or already
closed channels.
Basic strategy is,
- request child actor to cancel
- if process termination is detected, cancel the cancel
- if the process is still alive after a cancel request timeout warn the
user and yield back to the hard reap handling
Better encapsulate all the mem-chan, Queue, sync-primitives inside our
linked task channel in order to avoid `mypy`'s complaints about monkey
patching. This also sets footing for adding an `asyncio`-side channel
API that can be used more like this `trio`-side API.
For whatever reason `trio` seems to be swallowing this exception when
raised in the `trio` task so instead wrap it in our own non-base
exception type: `AsyncioCancelled` and raise that when the `asyncio`
task cancels itself internally using `raise <err> from <src_err>` style.
Further don't bother cancelling the `trio` task (via cancel scope)
since we we can just use the recv mem chan closure error as a signal
and explicitly lookup any set asyncio error.
Wraps the pairs of underlying `trio` mem chans and the `asyncio.Queue`
with this new composite which will be delivered from `open_channel_from()`.
This allows for both sending and receiving values from the `asyncio`
task (2 way msg passing) as well controls for cancelling or waiting on
the task.
Factor `asyncio` translation and re-raising logic into a new closure
which is run on both `trio` side error handling as well as on normal
termination to avoid missing `asyncio` errors even when `trio` task
cancellation is handled first.
Only close the `trio` mem chans on `trio` task termination *iff*
the task was spawned using `open_channel_from()`:
- on `open_channel_from()` exit, mem chan closure is the desired semantic
- on `run_task()` we normally only return a single value or error and
if the channel is closed before the error is raised we may propagate
a `trio.EndOfChannel` instead of the desired underlying `asyncio`
task's error
Pull the common `asyncio` -> `trio` error translation logic into
a common context manager and don't expect a final result to be captured
when using `open_channel_from()` since it's a manager interface and it
would be clunky to try and deliver some "final result" after exit.
Verify that if the `asyncio` side task cancels (itself) that we raise
that `asyncio.CancelledError` on the `trio` side. In the case where
`trio` initiated the cancel whether or not the `asyncio` side ended up
raising `CancelledError` doesn't really matter to us as long as the far
task did indeed terminate.
Close the mem chan before cancelling the `trio` task in order to ensure
we retrieve whatever error is shuttled from `asyncio` before the channel
read is potentially cancelled (previously a race?).
Handle `asyncio.CancelledError` specially such that we raise it directly
(instead of `raise aio_cancelled from other_err`) since it *is* the
source error in the case where the cancellation is `asyncio` internal.
Clearly this wasn't developed against a task that spawned just an async
func in `asyncio`.. Fix all that and remove a bunch of unnecessary func
layers. Add provisional support for the target receiving the `to_trio`
and `from_trio` channels and for the @tractor.stream marker.
This should mostly maintain top level SC principles for any task spawned
using `tractor.to_asyncio.run()`. When the `asyncio` task completes make
sure to cancel the pertaining `trio` cancel scope and raise any error
that may have resulted. This interface uses `trio`'s "guest-mode" to run
`asyncio` loop using a special entrypoint which is handed to Python
during process spawn.
If the one side of an inter-actor context cancels the other then that
side should always expect back a `ContextCancelled` message. However we
should not set this error in this case (where the cancel request was
sent and a `ContextCancelled` msg was received back) since it may
override some other error that caused the cancellation request to be
sent out in the first place. As an example when a context opens another
context to a peer and some error happens which causes the second peer
context to be cancelled but we want to propagate the original error.
Fixes the issue found in https://github.com/pikers/piker/issues/244
The underlying issue is actually that a nested `Context` which was
cancelled was overriding the local error that triggered that secondary's
context's cancellation in the first place XD. This test catches that
case.
Relates to https://github.com/pikers/piker/issues/244
After more extensive testing I realized that keying on the context
manager *instance id* isn't going to work since each entering task is
going to create a unique key XD
Instead pass the manager function as `acm_func` and optionally allow
keying the resource on the passed `kwargs` (if hashable) or the
`key:str`. Further, pass the key to the enterer task and avoid
a separate keying scheme for the manager versus the value it delivers.
Don't bother with checking and releasing the lock in `finally:` block,
it should be an error if it's still locked.
This actually catches a lot of bugs to do with stream termination and
``MsgStream.subscribe()`` usage where the underlying stream closes from
the producer side. When this passes the broadcaster logic will have to
ensure non-lossy fan out semantics and closure tracking.
Without this wakeup you can have tasks which re-enter `.receive()`
and get stuck waiting on the wakeup event indefinitely. Whenever
a ``trio.EndOfChannel`` arrives we want to make sure all consumers
at least know about it and don't block. This previous behaviour was
basically a bug.
Add some state flags for tracking if the broadcaster was either
cancelled or terminated via EOC mostly for testing and debugging
purposes though this info might be useful if we decide to offer
a `.statistics()` like API in the future.
This commit obviously denotes a re-license of all applicable parts of
the code base. Acknowledgement of this change was completed in #274 by
the majority of the current set of contributors. From here henceforth
all changes will be AGPL licensed and distributed. This is purely an
effort to maintain the same copy-left policy whilst closing the
(perceived) SaaS loophole the GPL allows for. It is merely for this
loophole: to avoid code hiding by any potential "network providers" who
are attempting to use the project to make a profit without either
compensating the authors or re-distributing their changes.
I thought quite a bit about this change and can't see a reason not to
close the SaaS loophole in our current license. We still are (hard)
copy-left and I plan to keep the code base this way for a couple
reasons:
- The code base produces income/profit through parent projects and is
demonstrably of high value.
- I believe firms should not get free lunch for the sake of
"contributions from their employees" or "usage as a service" which
I have found to be a dubious argument at best.
- If a firm who intends to profit from the code base wants to use it
they can propose a secondary commercial license to purchase with the
proceeds going to the project's authors under some form of well
defined contract.
- Many successful projects like Qt use this model; I see no reason it
can't work in this case until such a time as the authors feel it
should be loosened.
There has been detailed discussion in #103 on licensing alternatives.
The main point of this AGPL change is to protect the code base for the
time being from exploitation while it grows and as we move into the next
phase of development which will include extension into the multi-host
distributed software space.
If we make it too fast a nursery with debug mode children can cancel
too fast and causes some test failures. It's likely not a huge deal
anyway since the purpose of this poll/check is for human interaction
and the current delay isn't really that noticeable.
Decrease log levels in the debug module to avoid console noise when in
use. Toss in some more detailed comments around the new debugger lock
points.
It turns out recent improvements have made the debugger too good
so we need to just terminate the continue loop in this test when
we finally see the "spawn error" crash out because the breakpoint
forever case will literally, continue forever XD
A context method handling all this logic makes the most sense since it
contains all the state related to whether the error should be raised in
a nursery scope or is expected to be raised by a consumer task which
reads and processes the msg directly (via a `Portal` API call). This
also makes it easy to always process remote errors even when there is no
(stream) overrun condition.
A context stream overrun should normally never take place since if
a stream is opened (via ``Context.open_stream()``) backpressure is
applied on the message buffer (unless explicitly disabled by the
``backpressure=False`` flag) such that an overrun on the receiving task
should result in blocking the (remote) sender task (eventually depending
on the underlying ``MsgStream`` transport).
Here we add a special error message that reports if one side never
opened a stream and let's the user know in the overrun error message
that they may be trying to push messages to a task that isn't ready to
receive them.
Further fixes / details:
- pop any `Context` at the end of any `_invoke()` task that creates
one and registers with the runtime.
- ignore but warn about messages received for a context that either
no longer exists or is unknown (guarding against crashes by malicious
packets in the latter case)
Keeping it disabled on context open will help with detecting any stream
connection which was never opened on one side of the task pair. In that
case we can report that there was an overrun **and** a stream wasn't
opened versus if the stream is explicitly configured not to use bp then
we throw the standard overflow.
Use `trio.Nursery._closed` to detect "closure" XD since it seems to be
the most reliable way to determine if a spawn call will trigger
a runtime error.
Half of portal API usage requires a 1 message response (`.run()`,
`.run_in_actor()`) and the streaming APIs should probably be explicitly
enabled for backpressure if desired by the user. This makes more sense
in (psuedo) realtime systems where it's better to notify on a block then
freeze without notice. Make this default behaviour with a new error to
be raised: `tractor._exceptions.StreamOverrun` when a sender overruns
a stream by the default size (2**6 for now). The old behavior can be
enabled with `Context.open_stream(backpressure=True)` but now with
warning log messages when there are overruns.
Add task-linked-context error propagation using a "nursery raising"
technique such that if either end of context linked pair of tasks
errors, that error can be relayed to other side and raised as a form of
interrupt at the receiving task's next `trio` checkpoint. This enables
reliable error relay without expecting the (error) receiving task to
call an API which would raise the remote exception (which it might never
currently if using `tractor.MsgStream` APIs).
Further internal implementation details:
- define the default msg buffer size as `Actor.msg_buffer_size`
- expose a `msg_buffer_size: int` kwarg from `Actor.get_context()`
- maybe raise aforementioned context errors using
`Context._maybe_error_from_remote_msg()` inside `Actor._push_result()`
- support optional backpressure on a stream when pushing messages
in `Actor._push_result()`
- in `_invote()` handle multierrors raised from a `@tractor.context`
entrypoint as being potentially caused by a relayed error from the
remote caller task, if `Context._error` has been set then raise that
error inside the `RemoteActorError` that will be relayed back to that
caller more or less proxying through the source side error back to its
origin.
In preparation for supporting both backpressure detection (through an
optional error) as well as control over the msg channel buffer size, add
internal configuration flags for both to contexts. Also adjust
`Context._err_on_from_remote_msg()` -> `._maybe..` such that it can be
called and will only raise if a scope nursery has been set. Add
a `Context._error` for stashing the remote task's error that may be
delivered in an `'error'` message.
This more formally declares the runtime's remote task startingn API
and uses it throughout all the dependent `Portal` API methods.
Allows dropping `Portal._submit()` and simplifying `.run_in_actor()`
style result waiting to be delegated to the context APIs at remote
task `return` response time. We now also track the remote entrypoint
"type` as `Context._remote_func_type`.
Instead of tracking feeder mem chans per RPC dialog, store `Context`
instances which (now) hold refs to the underlying RPC-task feeder chans
and track them inside a `Actor._contexts` map. This begins a transition
to making the "context" idea the primitive abstraction for representing
messaging dialogs between tasks in different memory domains (i.e.
usually separate processes).
A slew of changes made this possible:
- change `Actor.get_memchans()` -> `.get_context()`.
- Add new `Context._send_chan` and `._recv_chan` vars.
- implicitly create a new context on every `Actor.send_cmd()` call.
- use the context created by `.send_cmd()` in `Portal.open_context()`
instead of manually creating one.
- call `Actor.get_context()` inside tasks run from `._invoke()`
such that feeder chans are implicitly created for callee tasks
thus fixing the bug #265.
NB: We might change some of the internal semantics to do with *when* the
feeder chans are actually created to denote whether or not a far end
task is actually *read to receive* messages. For example, in the cases
where it **never** will be ready to receive messages (one-way streaming,
a context that never opens a stream, etc.) we will likely want some kind
of error or at least warning to the caller that messages can't be sent
(yet).
Previously we were ignoring a race where the callee an opened task
context could enter `Context.open_stream()` before calling `.started().
Disallow this as well as calling `.started()` more then once.
We don't need to any more presuming you get ideal remote cancellation
conditions where the remote actor should teardown and kill the streams
from its end.
On msg loop termination we now check and see if a channel is associated
with a child-actor registered in some local task's nursery. If so, we
attempt to wait on channel closure initiated from the child side (by
draining the underlying msg stream) so as to avoid closing it too early
resulting in the child not relaying its termination status response. This
means we now support the ideal case in 2-general's where we get back the
ack to the closure request instead of just ignoring it and timing out XD
The main implementation detail is that when `Portal.cancel_actor()`
remotely calls `Actor.cancel()` we actually wait for the RPC response
from that request before allowing the channel shutdown sequence to
engage. The new msg stream draining support enables this.
Also, factor child-to-parent error propagation logic into a helper func
and improve some docs (yeah yeah y'all don't like the ''', i don't
care - it makes my eyes not hurt).
Use a `trio.Event` to enable nursery closure detection such that core
runtime tasks can be notified when a local nursery exits and allow
shutdown protocols to operate without close-before-terminate issues
(such as IPC channel closure during remote peer cancellation).
Enables "draining" the last set of messages after a channel/stream has
been terminated mostly for the purposes of receiving a final ACK to
a remote cancel command. Also, add an internal `Channel._cancel_called`
flag which can be set by `Portal.cancel_actor()`.
It's definitely possible to have a nursery spawn task be cancelled
before a `trio.Process` handle is ever returned; we now handle this
case as a cancelled-during-spawn scenario. Zombie collection logic
also is bypassed in this case.
Currently if the spawn task is waiting on a daemon actor it is likely in
`await proc.wait()`, however, if the actor nursery is subsequently
cancelled this checkpoint will be abandoned and the hard proc reaping
sequence will execute which results in a up to 3 second wait before
a "hard" system signal is sent to the child. Ideally such
a cancelled-during-daemon-actor-wait condition is instead handled by
first trying to cancel the remote actor using `Portal.cancel_actor()` (a
"graceful" remote cancel request) which should (presuming normal runtime
operation) result in an immediate collection of the process after normal
actor (remotely triggered) runtime cancellation.
Thanks to @richardsheridan for pointing out the limitations of using
*any* kind of value as the result-cached-flag and how it might cause
problems for anyone returning pickled blob-data. This changes the
`Portal` internal result value tracking to stash the full message from
which the value can be retrieved by any `Portal.result()` caller.
The internal change is that `Portal._return_once()` now returns a tuple
of the message *and* its value.
Fixes the issue where if the main remote task returns `None`,
`Portal.result()` would erroneously wait again on the underlying feeder
mem chan since `None` was being used as the cache flag. Instead set the
flag as the channel uid and consider the result collected when set to
anything else (since it would be odd to return that value from a remote
task when you already can read it as part of portal/channel apis).
The api we've made here is actually closer to `asyncio.gather()` but
with opening async context managers instead of funcs. Use another event
to allow for graceful teardown of children on non-cancellation exits
and add a doc string.
Since it seems we're building out more and more higher level primitives
in order to support certain parallel style actor trees and messaging
patterns (eg. task broadcast channels), we might as well start a new
sub-package for purely `trio` constructions. We hereby dub this
the realm of `trionics` (like electronics but for trios instead of
electrons).
To kick things off, add an `async_enter_all()` concurrent
exit-stack-like context manager API which will concurrently spawn
a sequence of provided async context managers and deliver their ordered
results but with proper support for `trio` cancellation semantics.
The stdlib's `AsyncExitStack` is not compatible with nurseries not
`trio` tasks (which are cancelled) since as task will be suspended on
the stack after push and does not ever hit a checkpoint until the stack
is closed.
With the new fixes to the trio spawner we can expect that both root
*and* depth > 1 nursery owning actors will now not clobber any children
that are in debug (either via breakpoint or through crashing). The tests
changed now include more checks which ensure the 2nd level parent-ish
actors also bubble up through into `pdb` and don't kill any of their
(crashed) children before they're done themselves debugging.
This is actually surprisingly easy to grok having gone through a lot of
pain understanding edge cases in the zombie lord dev branch. Basically
we just need to make sure actors are managed in a 2 step reap sequence.
In the "soft" reap phase we wait for the process to terminate on its own
concurrently with (maybe) waiting for its portal's final result (if it's
a `.run_in_actor()`). If this path is cancelled or errors, then we do
a "hard" reap where we timeout and send a signal to the proc to
terminate immediately. The only last remaining trick is to tie in the
root-is-debugger-aware logic to yet again avoid tty clobbers.
As for `Actor.cancel()` requests, do the same for
`Actor._cancel_task()` but use `_invoke()` to ensure
correct msg transactions with caller. Don't cancel task
cancels on a cancel-all-tasks operation in attempt at
more determinism.
Now that we're on our way to a (somewhat) serious beta release I think
it's about time to start de-noising the logging emissions. Since we're
trying out this approach of "stack layer oriented" log levels, I figured
this is a good time to move most of the "warnings" to what they should
be: cancellation monitoring status messages. The level is set to 16
which is just above our "runtime" level but just below the traditional
"info" level. I think this will be a decent approach since usually if
you're confused about why your `tractor` app is behaving unlike you
expect, it's 90% of the time going to be to do with cancellation or
error propagation. This this setup a user can specify the 'cancel' level
and see all the msgs pertaining to both actor and task-in-actor
cancellation mechanics.
The stdlib's `logging.LoggingAdapter` doesn't currently pass through
`stacklevel: int` down to its wrapped logger instance. Hack it here
and get our msgs looking like they would if using a built-in level.
In an effort to have some kind of more formal interface around the
transport layer, add a `MsgTransport` protocol type and use with
the channel composition of message streams. Start a little "key map"
of `(<codec>, <protocol>)` to `MsgTransport` types which can be
dynamically loaded. Add a `Channel.from_stream()` constructor thus
cleaning up the mangled logic that was in the constructor based on
inputs. Drop all the "auto reconnect" channel logic for now since
nothing is using it (internally) and it's likely it will need rework
once we bring in a protocol besides TCP.
`msgspec` sends python lists over the wire
(https://github.com/jcrist/msgspec/issues/30) which is fine and dandy
but we use them as lookup keys so we need to be sure we tuple-cast
first.
This change some super old (and bad) code from the project's very early
days. For some redic reason i must have thought masking `trio`'s
internal stream / transport errors and a TCP EOF as `StopAsyncIteration`
somehow a good idea. The reality is you probably
want to know the difference between an unexpected transport error
and a simple EOF lol. This begins to resolve that by adding our own
special `TransportClosed` error to signal the "graceful" termination of
a channel's underlying transport. Oh, and this builds on the `msgspec`
integration which helped shed light on the core issues here B)
Add a `tractor._ipc.MsgspecStream` type which can be swapped in for
`msgspec` serialization transparently. A small msg-length-prefix framing
is implemented as part of the type and we use
`tricycle.BufferedReceieveStream` to handle buffering logic for the
underlying transport.
Notes:
- had to force cast a few more list -> tuple spots due to no native
`tuple`decode-by-default in `msgspec`: https://github.com/jcrist/msgspec/issues/30
- the framing can be understood by this protobuf walkthrough:
https://eli.thegreenplace.net/2011/08/02/length-prefix-framing-for-protocol-buffers
- `tricycle` becomes a new dependency
Can only really use an encoder currently since there is no streaming api
in `msgspec` as of currently. See jcrist/msgspec#27.
Not sure if any encoding speedups are currently noticeable especially
without any validation going on yet XD.
First experiments toward #196
- drop `shield` input to `MsgStream`
- check for cancel called prior to loading the feeder mem chan
in `Context.open_stream()`
- warn on a timeout when trying to cancel a remote task from
`Context.cancel()`
- drop noop endofchannel handler block
Follow up to previous commit: extend our simple context test set to
include cancellation via kbi in the parent as well as timeout logic and
testing of the parent opening a stream even though the target actor does
not.
Thanks again to https://github.com/adder46/wrath for discovering this
bug.
Not sure we even have a test for this yet. The main issue discovered by
a user project (https://github.com/adder46/wrath) was that a kbi raised
inside a block like this (with both recv-only and send-recv streams)
would not cancel on the first ctrl-c sent from console and instead
SIGiNT had to be repeatedly sent as many times as there are subactors in
the first level tree. This test catches that as well as just verifies
the basic side-by-side functionality.
The `collections.deque` takes care of array length truncation of values
for us implicitly but in the future we'll likely want this value exposed
to alternate array implementations. This patch is to provide for that as
well as make `mypy` happy since the `dequeu.maxlen` can also be `None`.
Add a couple more tests to check that a parent and sub-task stream can
be lagged and recovered (depending on who's slower). Factor some of the
test machinery into a new ctx mngr to make it all happen.
Get rid of all the (requirements for) clones of the underlying
receivable. We can just use a uuid generated key for each instance
(thinking now this can probably just be `id(self)`). I'm fully convinced
now that channel cloning is only a source of confusion and anti-patterns
when we already have nurseries to define resource lifetimes. There is no
benefit in particular when you allocate subscriptions using a context
manager (not sure why `trio.open_memory_channel()` doesn't enforce
this).
Further refinements:
- add a `._closed` state that will error the receiver on reuse
- drop module script section; it's been moved to a real test
- call the "receiver" duck-type stub a new name
This allows for wrapping an existing stream by re-assigning its receive
method to the allocated broadcaster's `.receive()` so as to avoid
expecting any original consumer(s) of the stream to now know about the
broadcaster; this instead mutates the stream to delegate to the new
receive call behind the scenes any time `.subscribe()` is called.
Add a `typing.Protocol` for so called "cloneable channels" until we
decide/figure out a better keying system for each subscription and
mask all undesired typing failures.
Add `ReceiveMsgStream.subscribe()` which allows allocating a broadcast
receiver around the stream for use by multiple actor-local consumer
tasks. Entering this context manager idempotently mutates the stream's
receive machinery which for now can not be undone. Move `.clone()` to
the receive stream type.
Resolves#204
For every set of broadcast receivers which pull from the same producer,
we need a singleton state for all of,
- subscriptions
- the sender ready event
- the queue
Add a `BroadcastState` dataclass for this and pass it to all
subscriptions. This makes the design much more like the built-in memory
channels which do something very similar with `MemoryChannelState`.
Use a `filter()` on the subs list in the sequence update step, plus some
other commented approaches we can try for speed.
Using the current task as a subscription key fails horribly as soon as
you hand off new subscription receiver to another task you've spawned..
Instead use the underlying ``trio.abc.ReceiveChannel.clone()`` as a key
(so i guess we're assuming cloning is supported by the underlying?)
which makes this all work just like default mem chans. As a bonus, now
we can just close the underlying rx (which may be a clone) on
`.aclose()` and everything should just work in terms of the underlying
channels lifetime (i think?).
Change `.subscribe()` to be async since the receive channel type
interface only expects `.aclose()` and it actually ends up being
nicer for 3.9+ style `async with` parentheses style anyway.
Buncha improvements:
- pass in the queue via constructor
- tracking over all underlying memory channel closure using cloning
- do it like `tokio` and set lagged consumers to the last sequence
before raising
- copy the subs on first receiver wakeup for iteration instead of
iterating the table directly (and being forced to skip the current
tasks sequence increment)
- implement `.aclose()` to close the underlying clone for this task
- make `broadcast_receiver()` just take the recv chan since it doesn't
need anything on the send side.
We're not actually using this but it's for reference if we do end up
needing it.
The std lib's `pdb` internals override SIGINT handling whenever one
enters the debugger repl. Force a handler that kills the tree if SIGINT
is triggered from the root actor, otherwise ignore it since supervised
children should be managed already. This resolves an issue with guest
mode where `pdb` causes SIGINTs to be swallowed resulting in the host
loop never terminating the process tree.
The whole origin was not having an explicit open/close semantic for
streams. We have that now so this internal mechanic isn't needed and
further our streams become more correct by having `.aclose()` be
independent of cancellation.
Add a small config with a manually specified version key for now.
Fix up some changelog contents from last release and bump our `setup.py`
version to an `.alpha2.dev0`.
Resolves#227
We may get multiple re-entries to debugger by `bp_forever` sub-actor
now since the root will incrementally try to cancel it only when the tty
lock is not held.
Finally this makes a cancelled root actor nursery not clobber child
tasks which request and lock the root's tty for the debugger repl.
Using an edge triggered event which is set after all fifo-lock-queued
tasks are complete, we can be sure that no lingering child tasks are
going to get interrupted during pdb use and tty lock acquisition.
Further, even if new tasks do queue up to get the lock, the root will
incrementally send cancel msgs to each sub-actor only once the tty is
not locked by a (set of) child request task(s). Add shielding around all
the critical sections where the child attempts to allocate the lock from
the root such that it won't be disrupted from cancel messages from the
root after the acquire lock transaction has started.
If the root calls `trio.Process.kill()` on immediate child proc teardown
when the child is using pdb, we can get stdstreams clobbering that
results in a pdb++ repl where the user can't see what's been typed. Not
killing such children on cancellation / error seems to resolve this
issue whilst still giving reliable termination. For now, code that
special path until a time it becomes a problem for ensuring zombie
reaps.
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.
Another face palm that was causing serious issues for code that is using
the `.shielded` feature..
Add a bunch more detailed comments for all this subtlety and hopefully
get it right once and for all. Also aggregated the `trio` errors that
should trigger closure inside `.aclose()`, hopefully that's right too.
Revert this change since it really is poking at internals and doesn't
make a lot of sense. If the context is going to be cancelled then the
msg loop will tear down the feed memory channel when ready, we don't
need to be clobbering it and confusing the runtime machinery lol.
Add clear teardown semantics for `Context` such that the remote side
cancellation propagation happens only on error or if client code
explicitly requests it (either by exit flag to `Portal.open_context()`
or by manually calling `Context.cancel()`). Add `Context.result()`
to wait on and capture the final result from a remote context function;
any lingering msg sequence will be consumed/discarded.
Changes in order to make this possible:
- pass the runtime msg loop's feeder receive channel in to the context
on the calling (portal opening) side such that a final 'return' msg
can be waited upon using `Context.result()` which delivers the final
return value from the callee side `@tractor.context` async function.
- always await a final result from the target context function in
`Portal.open_context()`'s `__aexit__()` if the context has not
been (requested to be) cancelled by client code on block exit.
- add an internal `Context._cancel_called` for context "cancel
requested" tracking (much like `trio`'s cancel scope).
- allow flagging a stream as terminated using an internal
`._eoc` flag which will mark the stream as stopped for iteration.
- drop `StopAsyncIteration` catching in `.receive()`; it does
nothing.
This mostly adds the api described in
https://github.com/goodboy/tractor/issues/53#issuecomment-806258798
The first draft summary:
- formalize bidir steaming using the `trio.Channel` style interface
which we derive as a `MsgStream` type.
- add `Portal.open_context()` which provides a `trio.Nursery.start()`
remote task invocation style for setting up and tearing down tasks
contexts in remote actors.
- add a distinct `'started'` message to the ipc protocol to facilitate
`Context.start()` with a first return value.
- for our `ReceiveMsgStream` type, don't cancel the remote task in
`.aclose()`; this is now done explicitly by the surrounding `Context`
usage: `Context.cancel()`.
- streams in either direction still use a `'yield'` message keeping the
proto mostly symmetric without having to worry about which side is the
caller / portal opener.
- subtlety: only allow sending a `'stop'` message during a 2-way
streaming context from `ReceiveStream.aclose()`, detailed comment
with explanation is included.
Relates to #53
Since we currently have no real "discovery protocol" between process
trees, the current naive approach is to check via a connect and drop to
see if a TCP server is bound to a particular address during root actor
startup. This was a historical decision and had no real grounding beyond
taking a simple approach to get something working when the project
was first started.
This is obviously problematic from an error handling perspective since
we need to be able to avoid such quick connect-and-drops from cancelling
an "arbiter"'s (registry actor's) channel-msg loop machinery (which
would propagate and cancel the actor).
For now we map this particular TCP error, which gets remapped by `trio`
as a `trio.BrokenResourceError` to our own internal `TransportClosed`
which is swallowed by channel message loop processing and indicates
a graceful teardown of the far end actor.
This change some super old (and bad) code from the project's very early
days. For some redic reason i must have thought masking `trio`'s
internal stream / transport errors and a TCP EOF as `StopAsyncIteration`
somehow a good idea. The reality is you probably
want to know the difference between an unexpected transport error
and a simple EOF lol. This begins to resolve that by adding our own
special `TransportClosed` error to signal the "graceful" termination of
a channel's underlying transport. Oh, and this builds on the `msgspec`
integration which helped shed light on the core issues here B)
It's clear now that special attention is needed to handle the case where
a spawned `multiprocessing` proc is started but then the parent is
cancelled before the child can connect back; in this case we need to be
sure to kill the near-zombie child asap. This may end up being the
solution to other resiliency issues seen around mp with nested process
trees too. More testing is needed to be sure.
Relates to #84#89#134#146
NB: this is a breaking change removing support for `Portal.run()` being
able to invoke remote streaming functions and instead replacing the
method call with an async context manager api `Portal.open_stream_from()`
This style explicitly defines stream teardown at the call site instead
of expecting the user to handle tricky things correctly themselves: eg.
`async_geneartor.aclosing()`. Going forward `Portal.run()` can be used
only for invoking async functions.
Move receive stream into streaming modules and rebrand as a "message
stream". Factor out cancellation mechanics in `.aclose()` into the
`Context` type which will soon provide the api for for cancelling portal
invocations. Comment-stage a few methods on both types in anticipation
of a new bi-directional streaming api. Add a `MsgStream` bidirectional
channel type which will be the eventual type yielded from
`Context.open_stream()`. Adjust the response/dialog types to be the set
`{'asyncfun', 'asyncgen', 'context'}`. OH, and add async func checking
in `Portal.run()` to catch and error on sync funcs early.
You can always wrap a sync function in an async one and there seems to
be no good reason to support invoking them directly especially since
cancellation won't work without some thread hackery. If it's requested
we'll point users to `trio-parallel`.
Resolves#77
Add a sync method that can be used to cancel the current actor from
a synchronous context. This is useful in debugging situations where
sync debugger code may need to kill the process tree.
Also, make the internal "lifetime stack" a global var; easier to manage
from client code that may was to add callbacks prior to the actor
runtime being fully setup.
This is a draft of the `tractor` way to implement the example from the
"processs pool" in the stdlib's `concurrent.futures` docs:
https://docs.python.org/3/library/concurrent.futures.html#processpoolexecutor-example
Our runtime is of course slower to startup but once up we of course get
the same performance, this confirms that we need to focus some effort
not on warm up and teardown times. The mp forkserver method definitely
improves startup delay; rolling our own will likely be a good hot spot
to play with.
What's really nice is our implementation is done in approx 10th the code ;)
Also, do we want offer and interface that yields results as they arrive?
Relates to #175
Using `None` as the default key for a `@msg.pub` can cause conflicts if
there is more then one "taskless" (no tasks={,} passed) pub offered on
an actor... So instead use the first trio "task name" (usually just the
function name) instead thus avoiding this very hard to debug and
understand problem.
Probably should throw in a test but I'm super lazy today.
This begins the move to dropping support for `tractor.run()` which we
don't really need since the runtime is started (as it always has been)
from a new sub-task / nursery. Instead this introduces starting the
actor tree through a `open_root_actor()` async context manager which
we'll likely implicitly call (from the root) on the first use of an
actor nursery.
Drop `_actor._start_actor()` and factor its contents into this new api.
Make `run()` and `run_daemon()` use `open_root_actor()` until we decide
to remove them.
Relates to #168 and #177
It turns out in order to maintain our sneaky little "call an `Actor`
method in this remote process" we still need the ability to invoke
functions from a namespace. We're currently using a "self" namespace as
a way to do this for internal inter-process method calling. Either way,
I see no reason not to keep a public method for this invoke style (we
just won't market it) since it is still how the machinery works
underneath.
This resolves and completes #69 allowing all RPC invocation APIs to pass
function references directly instead of explicit `str` names for the
target namespace and function (this is still done implicitly
underneath). This brings us closer to `trio`'s task running API as well
as acknowledges that any inter-host RPC system (and API) will likely
need to be implemented on top of local RPC primitives anyway. Even if
this ends up **not** being true we can always go to "function stubs" as
part of our IAC protocol or, add a new method to do explicit namespace
calls: `.run_from_module()` or whatever everyone votes on.
Resolves#69
Further, this commit drops `Actor.statespace` from the entire system
since a user can easily get this same functionality using module
level variables. Fix docs to match all these changes (luckily mostly
already done due to example scripts referencing).
Add a ``tractor._portal.StreamReceiveChannel.shield_channel()`` context
manager which allows for avoiding the closing of an IPC stream's
underlying channel for the purposes of task re-spawning. Sometimes you
might want to cancel a task consuming a stream but not tear down the IPC
between actors (the default). A common use can might be where the task's
"setup" work might need to be redone but you want to keep the
established portal / channel in tact despite the task restart.
Includes a test.
Turns out this is a lower level issue in terms of the stdlib's default
`pdb.Pdb` settings and how they conflict with `trio`s cancellation and
KBI handling. The details are hashed out more thoroughly in
python-trio/trio#1155. Maybe we can get a fix in trio so things are
solved under our feet :)
The channel server should be torn down *before* the rpc
task/service nursery. Do this explicitly even in the root's main task
to avoid a strange hang I found in the pubsub tests. Start dropping
the `warnings.warn()` usage.
Add `Actor._cancel_called` and `._cancel_complete` making it possible to
determine whether the actor has started the cancellation sequence and
whether that sequence has fully completed. This allows for blocking in
internal machinery tasks as necessary. Also, always trigger the end of
ongoing rpc tasks even if the last task errors; there's no guarantee the
trio cancellation semantics will guarantee us a nice internal "state"
without this.
For reliable remote cancellation we need to "report" `trio.Cancelled`s
(just like any other error) when exhausting a portal such that the
caller can make decisions about cancelling the respective actor if need
be.
Resolves#156
This appears to demonstrate the same bug found in #156. It looks like
cancelling a subactor with a child, while that child is running sync code,
can result in the child never getting cancelled due to some strange
condition where the internal nurseries aren't being torn down as
expected when a `trio.Cancelled` is raised.
Every subactor in the tree now receives the socket (or whatever the
mailbox type ends up being) during startup and can call the new
`tractor._discovery.get_root()` function to get a portal to the current
root actor in their tree. The main reason for adding this atm is to
support nested child actors gaining access to the root's tty lock for
debugging.
Also, when a channel disconnects from a message loop, might as well kill
all its rpc tasks.
It's not like any of this code is really being used anyway since we
aren't indefinitely blocking for cancelled subactors to terminate (yet).
Drop the `do_hard_kill()` bit for now and just rely on the underlying
process api. Oh, and mark the nursery as cancelled asap.
Seems like the request task cancel scope is actually solving all the
deadlock issues and masking SIGINT isn't changing much behaviour at all.
I think let's keep it unmasked for now in case it does turn out useful
in cancelling from unrecoverable states while in debug.
This is needed in order to avoid the deadlock condition where
a child actor is waiting on the root actor's tty lock but it's parent
(possibly the root) is waiting on it to terminate after sending a cancel
request. The solution is simple: create a cancel scope around the
request in the child and always cancel it when a cancel request from the
parent arrives.
There seems to be no good reason not too since our cancellation
machinery/protocol should do this work when the root receives the
signal. This also (hopefully) helps with some debugging race condition
stuff.
This seems to prevent a certain class of bugs to do with the root actor
cancelling local tasks and getting into deadlock while children are
trying to acquire the tty lock. I'm not sure it's the best idea yet
since you're pretty much guaranteed to get "stuck" if a child activates
the debugger after the root has been cancelled (at least "stuck" in
terms of SIGINT being ignored). That kinda race condition seems to still
exist somehow: a child can "beat" the root to activating the tty lock
and the parent is stuck waiting on the child to terminate via its
nursery.
This aids with tearing down resources **after** the crash handling and
debugger have completed. Leaving this internal for now but should
eventually get a public convenience function like
`tractor.context_stack()`.
Keep an actor local (bool) flag which determines if there is already
a running debugger instance for the current process. If another task
tries to enter in this case, simply ignore it since allowing entry may
result in a deadlock where the new task will be sync waiting on the
parent stdio lock (a case that will never arrive due to the current
debugger's active use of it).
In the future we may want to allow FIFO queueing of local tasks where
instead of ignoring re-entrant breakpoints we allow tasks to async wait
for debugger release, though not sure the implications of that since
you'd likely want to support switching the debugger to the new task and
that could cause deadlocks where tasks are inter-dependent. It may be
more sane to just error on multiple breakpoint requests within an actor.
This is the first step in addressing #113 and the initial support
of #130. Basically this allows (sub)processes to engage the `pdbpp`
debug machinery which read/writes the root actor's tty but only in
a FIFO semaphored way such that no two processes are using it
simultaneously. That means you can have multiple actors enter a trace or
crash and run the debugger in a sensible way without clobbering each
other's access to stdio. It required adding some "tear down hooks" to
a custom `pdbpp.Pdb` type such that we release a child's lock on the
parent on debugger exit (in this case when either of the "continue" or
"quit" commands are issued to the debugger console).
There's some code left commented in anticipation of full support for
issue #130 where we're need to actually capture and feed stdin to the
target (remote) actor which won't necessarily being running on the same
host.
Allow entering and attaching to a `pdb` instance in a child process.
The current hackery is to have the child make an rpc to the parent and
ask it to hijack stdin, once complete the child enters a `pdb` blocking
method. The parent then relays all stdin input to the child thus
controlling the "remote" debugger.
A few things were added to accomplish this:
- tracking the mapping of subactors to their parent nurseries
- in the root actor, cancelling all nurseries under the root `trio` task
on cancellation (i.e. `Actor.cancel()`)
- pass a "runtime vars" map down the actor tree for propagating global state
In an effort acquire more deterministic actor cancellation,
this adds a clearer and more resilient (whilst possibly a bit
slower) internal nursery structure with explicit semantics for
clarifying the task-scope shutdown sequence.
Namely, on cancellation, the explicit steps are now:
- cancel all currently running rpc tasks and wait
for them to complete
- cancel the channel server and wait for it to complete
- cancel the msg loop for the channel with the immediate parent
- de-register with arbiter if possible
- wait on remaining connections to release
- exit process
To accomplish this add a new nursery called the "service nursery" which
spawns all rpc tasks **instead of using** the "root nursery". The root
is now used solely for async launching the msg loop for the primary
channel with the parent such that it is (nearly) the last thing torn
down on cancellation.
In the future it should also be possible to have `self.cancel()` return
a result to the parent once the runtime is sure that the rest of the
shutdown is atomic; this would allow for a true unbounded shield in
`Portal.cancel_actor()`. This will likely require that the error
handling blocks in `Actor._async_main()` are moved "inside" the root
nursery block such that the msg loop with the parent truly is the last
thing to terminate.
Always shield waiting for he process and always run
``trio.Process.__aexit__()`` on teardown. This enforces
that shutdown happens to due cancellation triggered inside
the sub-actor instead of the process being killed externally
by the parent.
The real issue is if the root nursery gets cancelled prior to
de-registration with the arbiter. This doesn't seem easy to
reproduce by side effect of a KBI however that is how it was
discovered in practise.
There was code from the last de-registration fix PR that I had commented
(to do with shielding arbiter dereg steps in `Actor._async_main()`) because
the block didn't seem to make a difference under infinite streaming
tests. Turns out it **for sure** is needed under certain conditions (likely
if the actor's root nursery is cancelled prior to actor nursery exit).
This was an attempt to simulate the failure mode if you manually close the
stream **before** cancelling the containing **actor**.
More tests to come I guess.
Trio will kill subprocesses via `Process.__aexit__()` using a `finally:`
block (which, yes, will get triggered on cancellation) so we avoid that
until true process "tear down" since subactors do many things during
graceful shutdown (such as de-registering from the name discovery
system). Oddly this only seems to be an issue during cancellation of
infinite stream consumption.
Resolves#141
This truly reproduces #141. It turns out the problem only occurs when
we're cancelled in the middle of consuming "infinite streams".
Good news is this tests a lot of edge cases :)
In order to have reliable subactor startup we need the following
sequence to take place:
- connect to the parent actor, handshake and receive runtime state
- load exposed modules into memory
- start the channel server up fully using the provided bind address
- finally, start processing new messages from the parent
Add a bunch more comments to clarify all this.
- ease up on first stream test run deadline
- skip streaming tests in CI for mp backend, period
- give up on > 1 depth nested spawning with mp
- completely give up on slow spawning on windows
Using the context manager interface does some extra teardown beyond simply
calling `.wait()`. Pass the subactor's "uid" on the exec line for
debugging purposes when monitoring the process tree from the OS.
Hard code the child script module path to avoid a double import warning.
Verify ctrl-c, as a user would trigger it, properly cancels the actor
tree. This was an issue with `trio-run-in-process` that clearly wasn't
being handled correctly but for sure is now with the plain old
`trio` process spawner.
Resolves#115
This is an edit to factor out changes needed for the `asyncio` in guest mode
integration (which currently isn't tested well) so that later more pertinent
changes (which are tested well) can be rebased off of this branch and
merged into mainline sooner. The *infect_asyncio* branch will need to be
rebased onto this branch as well before merge to mainline.
This is an initial solution for #120.
Allow spawning `asyncio` based actors which run `trio` in guest
mode. This enables spawning `tractor` actors on top of the `asyncio`
event loop whilst still leveraging the SC focused internal actor
supervision machinery. Add a `tractor.to_syncio.run()` api to allow
spawning tasks on the `asyncio` loop from an embedded (remote) `trio`
task and return or stream results all the way back through the `tractor`
IPC system using a very similar api to portals.
One outstanding problem is getting SC around calls to
`asyncio.create_task()`. Currently a task that crashes isn't able to
easily relay the error to the embedded `trio` task without us fully
enforcing the portals based message protocol (which seems superfluous
given the error ref is in process). Further experiments using `anyio`
task groups may alleviate this.
This should address both #98 and #108 by using our now tested examples
scripts directly in the documentation (so we know they must work or CI
will fail).
Resolves#98#108
Parametrize our docs example test to include all (now fixed) examples
from the `READ.rst`. The examples themselves have been fixed/corrected
to run but they haven't yet been updated in the actual docs. Once #99
lands these example scripts will be directly included in our
documentation so there will be no possibility of presenting incorrect
examples to our users! This technically fixes#108 even though the new
example aren't going to be included directly in our docs until #99
lands.
Apply the fix from @chrizzFTD where we invoke the entry point using
module exec mode on a ``__main__.py`` and import the
``test_example::`main()` from within that entry point script.
A per #98 we need tests for examples from the docs as they would be run
by a user copy and pasting the code. This adds a small system for loading
examples from an "examples/" directory and executing them in
a subprocess while checking the output. We can use this to also verify
end-to-end expected logging output on std streams (ex. logging on
stderr).
To expand this further we can parameterize the test list using the
contents of the examples directory instead of hardcoding the script
names as I've done here initially.
Also, fix up the current readme examples to have the required/proper `if
__name__ == '__main__'` script guard.
This was originally bundled in #102 but the windows CI there has blocked
that from landing quickly. These examples need to be fixed stat since
I've had at least a couple people notice it now when first trying out
the project.
The logic in the `ActorNursery` block is critical to cancellation
semantics and in particular, understanding how supervisor strategies are
invoked. Stick in a bunch of explanatory comments to clear up these
details and also prepare to introduce more supervisor strats besides
the current one-cancels-all approach.
Instead of hackery trying to map modules manually from the filesystem
let Python do all the work by simply copying what ``multiprocessing``
does to "fixup the __main__ module" in spawned subprocesses. The new
private module ``_mp_fixup_main.py`` is simply cherry picked code from
``multiprocessing.spawn`` which does just that. We only need these
"fixups" when using a backend other then ``multiprocessing``; for
now just when using ``trio_run_in_process``.
Thanks to @salotz for pointing out that the first example in the docs
was broken. Though it's somewhat embarrassing this might also explain
the problem in #79 and certain issues in #59...
The solution here is to import the target RPC module using the its
unique basename and absolute filepath in the sub-actor that requires it.
Special handling for `__main__` and `__mp_main__` is needed since the
spawned subprocess will have no knowledge about these parent-
-state-specific module variables. Solution: map the modules name to the
respective module file basename in the child process since the module
variables will of course have different values in children.
Add a `--spawn-backend` option which can be set to one of {'mp',
'trio_run_in_process'} which will either run the test suite using the
`multiprocessing` or `trio-run-in-process` backend respectively.
Currently trying to run both in the same session can result in hangs
seemingly due to a lack of cleanup of forkservers / resource trackers
from `multiprocessing` which cause broken pipe errors on occasion (no
idea on the details).
For `test_cancellation.py::test_nested_multierrors`, use less nesting
when mp is used since it breaks if we push it too hard with the
whole recursive subprocess spawning thing...
Set `trio-run-in-process` as the default on *nix systems and
`multiprocessing`'s spawn method on Windows. Enable overriding the
default choice using `tractor._spawn.try_set_start_method()`. Allows
for easy runs of the test suite using a user chosen backend.
It seems that mixing the two backends in the test suite results in hangs
due to lingering forkservers and resource managers from
`multiprocessing`? Likely we'll need either 2 separate CI runs to work
or someway to be sure that these lingering servers are killed in between
tests.
This took a ton of tinkering and a rework of the actor nursery tear down
logic. The main changes include:
- each subprocess is now spawned from inside a trio task
from one of two containing nurseries created in the body of
`tractor.open_nursery()`: one for `run_in_actor()` processes and one for
`start_actor()` "daemons". This is to address the need for
`trio-run-in_process.open_in_process()` opening a nursery which must
be closed from the same task that opened it. Using this same approach
for `multiprocessing` seems to work well. The nurseries are waited in
order (rip actors then daemon actors) during tear down which allows
for avoiding the recursive re-entry of `ActorNursery.wait()` handled
prior.
- pull out all the nested functions / closures that were in
`ActorNursery.wait()` and move into the `_spawn` module such that
that process shutdown logic takes place in each containing task's
code path. This allows for vastly simplifying `.wait()` to just contain an
event trigger which initiates process waiting / result collection.
Likely `.wait()` should just be removed since it can no longer be used
to synchronously wait on the actor nursery.
- drop `ActorNursery.__aenter__()` / `.__atexit__()` and move this
"supervisor" tear down logic into the closing block of `open_nursery()`.
This not only cleans makes the code more comprehensible it also
makes our nursery implementation look more like the one in `trio`.
Resolves#93
Get a few more things working:
- fail reliably when remote module loading goes awry
- do a real hacky job of module loading using `sys.path` stuffsies
- we're still totally borked when trying to spin up and quickly cancel
a bunch of subactors...
It's a small move forward I guess.
Well...after enough `# type: ignore`s `mypy` is happy, and after enough clicking of *rerun build* the windows CI passed so I think this is prolly gtg peeps!
Prepend the actor and task names in each log emission. This makes
debugging much more sane since you can see from which process and
running task the log message originates from!
Resolves#13
Another step toward having a complete test for #89.
Subactor breadth still seems to cause the most havoc and is why I've
kept that value to just 2 for now.
If a nursery fails to cancel (some sub-actors presumably) then hard kill
the whole process tree to avoid hangs during a catastrophic failure.
This logic may get factored out (and changed) as we introduce custom
supervisor strategies.
Add a test to verify that `trio.MultiError`s are properly propagated up
a simple actor nursery tree. We don't have any exception marshalling
between processes (yet) so we can't validate much more then a simple
2-depth tree. This satisfies the final bullet in #43.
Note I've limited the number of subactors per layer to around 5 since
any more then this seems to break the `multiprocessing` forkserver;
zombie subprocesses seem to be blocking teardown somehow...
Also add a single depth fast fail test just to verify that it's the
nested spawning that triggers this forkserver bug.
`trio.MultiError` isn't an `Exception` (derived instead from
`BaseException`) so we have to specially catch it in the task
invocation machinery and ship it upwards (like regular errors)
since nurseries running in sub-actors can raise them.
Add `@tractor.stream` which must be used to denote non async generator
streaming functions which use the `tractor.Context` API to push values.
This enforces a more explicit denotation as well as allows enforcing the
declaration of the `ctx` argument in definitions.
This begins moving toward explicitly decorated "streaming functions"
instead of checking for a `ctx` arg in the signature.
- provide each context with its task's top level `trio.CancelScope`
such that tasks can cancel themselves explictly if needed via calling
`Context.cancel_scope()`
- make `Actor.cancel_task()` a private method (`_cancel_task()`) and
handle remote rpc calls specially such that the caller does not need
to provide the `chan` argument; non-primitive types can't be passed on
the wire and we don't want the client actor be require knowledge of
the channel instance the request is associated with. This also ties into
how we're tracking tasks right now (`Actor._rpc_tasks` is keyed by the
call id, a UUID, *plus* the channel).
- make `_do_handshake` a private actor method
- use UUID version 4
Can't seem to get the `capfd` fixture to capture subprocess logging to
stderr even though the console report shows the log message as being
captured? Skipping the test on the forkserver method for now.
Add full support for using the "spawn" process starting method as per:
https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods
Add a `spawn_method` argument to `tractor.run()` for specifying the
desired method explicitly. By default use the "fastest" method available.
On *nix systems this is the original "forkserver" method.
This should be the solution to getting windows support!
Resolves#60
As mentioned in prior commits there's currently a bug in Python that
make async gens **not** task safe. Since this is the core cause of almost
all recent problems, instead implement our own async iterator derivative of
`trio.abc.ReceiveChannel` by wrapping a `trio._channel.MemoryReceiveChannel`.
This fits more natively with the memory channel API in ``trio`` and adds
potentially more flexibility for possible bidirectional inter-actor streaming
in the future.
Huge thanks to @oremanj and of course @njsmith for guidance on this one!
In combination with `.aclose()`-ing the async gen instance returned from
`Portal.run()` this demonstrates the python bug:
https://bugs.python.org/issue32526
I've commented out the line that triggers the bug for now since this
case provides motivation for adding our own `trio.abc.ReceiveMemoryChannel`
implementation to be used instead of async gens directly (returned from
`Portal.run()`) since the latter is **not** task safe.
For now stop `.aclose()`-ing all async gens on portal close since it can
cause hangs and other weird behaviour if another task operates on the
same instance.
See https://bugs.python.org/issue32526.
Use an inner function / closure to properly process required arguments
at call time as is recommended in the `wrap` docs. Do async gen and
arg introspection at decorate time and raise appropriate type errors.
Turns out you get a bad situation if the target actor who's task you're
trying to cancel has already died (eg. from an external
`KeyboardInterrupt` or other error) and so we need to eventually bail on
the RPC request. Also don't bother closing the channel created in
`open_portal()` manually since the cancel scope should take care of all
that.
- when calling the async gen func provided by the user wrap it in
`@async_generator.aclosing` to ensure correct teardown at cancel time
- expect the gen to yield a dict with topic keys and data values
- add a `packetizer` function argument to the api allowing a user
to format the data to be published in whatever way desired
- support using the decorator without the parentheses (using default
arguments)
- use a `wrapt` "adapter" to override the signature presented to the
`_actor._invoke` inspection machinery
- handle the default case where `tasks` isn't provided; allow only one
concurrent publisher task
- store task locks in an actor local variable
- add a comprehensive doc string
Use the new `Actor.cancel_task()` api to remotely cancel streaming
tasks spawned by a portal. This guarantees that if an actor is
cancelled all its (remote) portal spawned tasks will be as well.
On portal teardown only cancel all async
generator calls (though we should cancel all RPC requests in general
eventually) and don't close the channel since it may have been passed
in from some other context that wishes to keep it connected. In
`open_portal()` run the message loop shielded so that if the local
task is cancelled, messaging will continue until the internal scope
is cancelled at end of block.
Enable cancelling specific tasks from a peer actor such that when
a actor task or the actor itself is cancelled, remotely spawned tasks
can also be cancelled. In much that same way that you'd expect a node
(task) in the `trio` task tree to cancel any subtasks, actors should
be able to cancel any tasks they spawn in separate processes.
To enable this:
- track rpc tasks in a flat dict keyed by (chan, cid)
- store a `is_complete` event to enable waiting on specific
tasks to complete
- allow for shielding the msg loop inside an internal cancel scope
if requested by the caller; there was an issue with `open_portal()`
where the channel would be torn down because the current task was
cancelled but we still need messaging to continue until the portal
block is exited
- throw an error if the arbiter tries to find itself for now
Add a draft pub-sub API `@tractor.msg.pub` which allows
for decorating an asyn generator which can stream topic keyed
dictionaries for delivery to multiple calling / consuming tasks.
Instead of chan/cid, whenever a remote function defines a `ctx` argument
name deliver a `Context` instance to the function. This allows remote
funcs to provide async generator like streaming replies (and maybe more
later).
Additionally,
- load actor modules *after* establishing a connection to the spawning
parent to avoid crashing before the error can be reported upwards
- fix a bug to do with unpacking and raising local internal actor errors
from received messages
RPC module/function lookups should not cause the target actor to crash.
This change instead ships the error back to the calling actor allowing
for the remote actor to continue running depending on the caller's
error handling logic. Adds a new `ModuleNotExposed` error to accommodate.
I'm not sure how this ever worked but when a "fake" async gen
(i.e. function with special `chan`, `cid` kwargs) is completed
we need to signal the end of the stream just like with normal
async gens. Also don't fail when trying to remove tasks that were
never tracked.
Fixes#46
At the expense of a bit more complexity in `ActorNursery.wait()`
(which I commented the heck out of fwiw) this adds far superior and
correct cancellation semantics for when a nursery is cancelled due
to (remote) errors in subactors.
This includes:
- `wait()` will now raise a `trio.MultiError` if multiple subactors
error with the same semantics as in `trio`.
- in `wait()` portals which are paired with `run_in_actor()`
spawned subactors (versus `start_actor()`) are waited on separately
and if the nursery **hasn't** been cancelled but there are errors
those are raised immediately before waiting on `start_actor()`
subactors which will block indefinitely if they haven't been
explicitly cancelled.
- if `wait()` does raise when the nursery hasn't yet been cancelled
it's expected that it will be called again depending on the actor
supervision strategy (i.e. right now we operate with a one-cancels-all
strategy, the same as `trio`, so `ActorNursery.__aexit__() calls
`cancel()` if any error is raised by `wait()`).
Oh and I added `is_main_process()` helper; can't remember why..
Use the new custom error types throughout the actor and portal
primitives and set a few new rules:
- internal errors are any error not raised by an rpc task and are
**not** forwarded to portals but instead are raised directly in
the msg loop.
- portals always re-raise a "main task" error for every call to
``Portal.result()``.
When an actor has already been registered with the arbiter it should
exist in the registry and thus the wait event should have been removed.
Check that the registry indeed holds an event before clearing it.
This is purely for documentation purposes for now as it should be
obvious a bunch of the signatures aren't using the correct "generics"
syntax (i.e. the use of `(str, int)` instead of `typing.Tuple[str, int])`)
in a bunch of places. We're also not using a type checker yet and besides,
`trio` doesn't really expose a lot of its internal types very well.
2SQASH
Something changed in 3.7 (likely to do with changes to the core
import system) that requires explicitly importing our version
of `forkserver.main()` in order to guarantee the server runs our
module code. Override `forkserver.ensure_running()`; specifically,
modify the python launch command.
2018-08-19 15:37:01 -04:00
156 changed files with 41808 additions and 2746 deletions
The ``trio`` backend offers a lightweight async wrapper around ``subprocess`` from the standard library and takes advantage of the ``trio.```open_process`_ API.
Tyler Goodlet
goodboy
Guillermo Rodriguez
goodboy
Igor
Giacomo Camporini
overclockworked64
Guillermo Rodriguez
Tyler Goodlet
Christian López Barrón
tgoodlet
