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 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.
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?).
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!
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.
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.
- `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!
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`
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()`.
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)
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.
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.
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.
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.
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)
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.
Tyler Goodlet
Tyler Goodlet