More formal `TransportClosed` reporting/raising
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.
aio_abandons
Tyler Goodlet
parent
3907cba68e
commit
af3745684c
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@ -49,6 +49,7 @@ from ._exceptions import (
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ModuleNotExposed as ModuleNotExposed,
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MsgTypeError as MsgTypeError,
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RemoteActorError as RemoteActorError,
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TransportClosed as TransportClosed,
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)
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from .devx import (
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breakpoint as breakpoint,
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@ -906,8 +906,59 @@ class StreamOverrun(
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'''
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class TransportClosed(trio.ClosedResourceError):
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"Underlying channel transport was closed prior to use"
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class TransportClosed(trio.BrokenResourceError):
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'''
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IPC transport (protocol) connection was closed or broke and
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indicates that the wrapping communication `Channel` can no longer
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be used to send/receive msgs from the remote peer.
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'''
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def __init__(
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self,
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message: str,
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loglevel: str = 'transport',
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cause: BaseException|None = None,
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raise_on_report: bool = False,
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) -> None:
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self.message: str = message
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self._loglevel = loglevel
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super().__init__(message)
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if cause is not None:
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self.__cause__ = cause
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# flag to toggle whether the msg loop should raise
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# the exc in its `TransportClosed` handler block.
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self._raise_on_report = raise_on_report
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def report_n_maybe_raise(
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self,
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message: str|None = None,
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) -> None:
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'''
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Using the init-specified log level emit a logging report
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for this error.
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'''
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message: str = message or self.message
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# when a cause is set, slap it onto the log emission.
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if cause := self.__cause__:
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cause_tb_str: str = ''.join(
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traceback.format_tb(cause.__traceback__)
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)
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message += (
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f'{cause_tb_str}\n' # tb
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f' {cause}\n' # exc repr
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)
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getattr(log, self._loglevel)(message)
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# some errors we want to blow up from
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# inside the RPC msg loop
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if self._raise_on_report:
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raise self from cause
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class NoResult(RuntimeError):
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284
tractor/_ipc.py
284
tractor/_ipc.py
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@ -54,7 +54,7 @@ from tractor._exceptions import (
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)
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from tractor.msg import (
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_ctxvar_MsgCodec,
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_codec,
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# _codec, XXX see `self._codec` sanity/debug checks
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MsgCodec,
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types as msgtypes,
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pretty_struct,
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@ -65,8 +65,18 @@ log = get_logger(__name__)
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_is_windows = platform.system() == 'Windows'
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def get_stream_addrs(stream: trio.SocketStream) -> tuple:
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# should both be IP sockets
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def get_stream_addrs(
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stream: trio.SocketStream
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) -> tuple[
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tuple[str, int], # local
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tuple[str, int], # remote
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]:
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'''
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Return the `trio` streaming transport prot's socket-addrs for
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both the local and remote sides as a pair.
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'''
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# rn, should both be IP sockets
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lsockname = stream.socket.getsockname()
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rsockname = stream.socket.getpeername()
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return (
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@ -75,17 +85,22 @@ def get_stream_addrs(stream: trio.SocketStream) -> tuple:
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)
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# TODO: this should be our `Union[*msgtypes.__spec__]` now right?
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MsgType = TypeVar("MsgType")
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# TODO: consider using a generic def and indexing with our eventual
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# msg definition/types?
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# - https://docs.python.org/3/library/typing.html#typing.Protocol
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# - https://jcristharif.com/msgspec/usage.html#structs
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# from tractor.msg.types import MsgType
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# ?TODO? this should be our `Union[*msgtypes.__spec__]` alias now right..?
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# => BLEH, except can't bc prots must inherit typevar or param-spec
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# vars..
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MsgType = TypeVar('MsgType')
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# TODO: break up this mod into a subpkg so we can start adding new
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# backends and move this type stuff into a dedicated file.. Bo
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#
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@runtime_checkable
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class MsgTransport(Protocol[MsgType]):
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#
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# ^-TODO-^ consider using a generic def and indexing with our
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# eventual msg definition/types?
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# - https://docs.python.org/3/library/typing.html#typing.Protocol
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stream: trio.SocketStream
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drained: list[MsgType]
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@ -120,9 +135,9 @@ class MsgTransport(Protocol[MsgType]):
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...
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# TODO: not sure why we have to inherit here, but it seems to be an
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# issue with ``get_msg_transport()`` returning a ``Type[Protocol]``;
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# probably should make a `mypy` issue?
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# TODO: typing oddity.. not sure why we have to inherit here, but it
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# seems to be an issue with `get_msg_transport()` returning
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# a `Type[Protocol]`; probably should make a `mypy` issue?
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class MsgpackTCPStream(MsgTransport):
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'''
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A ``trio.SocketStream`` delivering ``msgpack`` formatted data
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@ -145,7 +160,7 @@ class MsgpackTCPStream(MsgTransport):
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# https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
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#
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# TODO: define this as a `Codec` struct which can be
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# overriden dynamically by the application/runtime.
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# overriden dynamically by the application/runtime?
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codec: tuple[
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Callable[[Any], Any]|None, # coder
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Callable[[type, Any], Any]|None, # decoder
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@ -160,7 +175,7 @@ class MsgpackTCPStream(MsgTransport):
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self._laddr, self._raddr = get_stream_addrs(stream)
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# create read loop instance
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self._agen = self._iter_packets()
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self._aiter_pkts = self._iter_packets()
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self._send_lock = trio.StrictFIFOLock()
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# public i guess?
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# allow for custom IPC msg interchange format
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# dynamic override Bo
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self._task = trio.lowlevel.current_task()
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self._codec: MsgCodec = (
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codec
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or
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_codec._ctxvar_MsgCodec.get()
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)
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# TODO: mask out before release?
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# log.runtime(
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# f'New {self} created with codec\n'
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# f'codec: {self._codec}\n'
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# XXX for ctxvar debug only!
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# self._codec: MsgCodec = (
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# codec
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# or
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# _codec._ctxvar_MsgCodec.get()
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# )
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async def _iter_packets(self) -> AsyncGenerator[dict, None]:
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@ -190,6 +202,11 @@ class MsgpackTCPStream(MsgTransport):
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Yield `bytes`-blob decoded packets from the underlying TCP
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stream using the current task's `MsgCodec`.
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This is a streaming routine implemented as an async generator
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func (which was the original design, but could be changed?)
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and is allocated by a `.__call__()` inside `.__init__()` where
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it is assigned to the `._aiter_pkts` attr.
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'''
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decodes_failed: int = 0
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@ -204,16 +221,82 @@ class MsgpackTCPStream(MsgTransport):
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# seem to be getting racy failures here on
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# arbiter/registry name subs..
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trio.BrokenResourceError,
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):
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raise TransportClosed(
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f'transport {self} was already closed prior ro read'
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)
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) as trans_err:
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loglevel = 'transport'
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match trans_err:
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# case (
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# ConnectionResetError()
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# ):
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# loglevel = 'transport'
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# peer actor (graceful??) TCP EOF but `tricycle`
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# seems to raise a 0-bytes-read?
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case ValueError() if (
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'unclean EOF' in trans_err.args[0]
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):
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pass
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# peer actor (task) prolly shutdown quickly due
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# to cancellation
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case trio.BrokenResourceError() if (
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'Connection reset by peer' in trans_err.args[0]
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):
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pass
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# unless the disconnect condition falls under "a
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# normal operation breakage" we usualy console warn
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# about it.
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case _:
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loglevel: str = 'warning'
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raise TransportClosed(
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message=(
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f'IPC transport already closed by peer\n'
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f'x)> {type(trans_err)}\n'
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f' |_{self}\n'
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),
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loglevel=loglevel,
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) from trans_err
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# XXX definitely can happen if transport is closed
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# manually by another `trio.lowlevel.Task` in the
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# same actor; we use this in some simulated fault
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# testing for ex, but generally should never happen
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# under normal operation!
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#
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# NOTE: as such we always re-raise this error from the
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# RPC msg loop!
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except trio.ClosedResourceError as closure_err:
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raise TransportClosed(
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message=(
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f'IPC transport already manually closed locally?\n'
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f'x)> {type(closure_err)} \n'
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f' |_{self}\n'
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),
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loglevel='error',
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raise_on_report=(
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closure_err.args[0] == 'another task closed this fd'
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or
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closure_err.args[0] in ['another task closed this fd']
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),
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) from closure_err
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# graceful TCP EOF disconnect
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if header == b'':
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raise TransportClosed(
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f'transport {self} was already closed prior ro read'
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message=(
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f'IPC transport already gracefully closed\n'
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f')>\n'
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f'|_{self}\n'
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),
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loglevel='transport',
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# cause=??? # handy or no?
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)
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size: int
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size, = struct.unpack("<I", header)
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log.transport(f'received header {size}') # type: ignore
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@ -225,33 +308,20 @@ class MsgpackTCPStream(MsgTransport):
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# the current `MsgCodec`.
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codec: MsgCodec = _ctxvar_MsgCodec.get()
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# TODO: mask out before release?
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if self._codec.pld_spec != codec.pld_spec:
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# assert (
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# task := trio.lowlevel.current_task()
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# ) is not self._task
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# self._task = task
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self._codec = codec
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log.runtime(
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f'Using new codec in {self}.recv()\n'
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f'codec: {self._codec}\n\n'
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f'msg_bytes: {msg_bytes}\n'
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)
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# XXX for ctxvar debug only!
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# if self._codec.pld_spec != codec.pld_spec:
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# assert (
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# task := trio.lowlevel.current_task()
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# ) is not self._task
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# self._task = task
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# self._codec = codec
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# log.runtime(
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# f'Using new codec in {self}.recv()\n'
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# f'codec: {self._codec}\n\n'
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# f'msg_bytes: {msg_bytes}\n'
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# )
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yield codec.decode(msg_bytes)
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# TODO: remove, was only for orig draft impl
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# testing.
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#
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# curr_codec: MsgCodec = _ctxvar_MsgCodec.get()
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# obj = curr_codec.decode(msg_bytes)
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# if (
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# curr_codec is not
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# _codec._def_msgspec_codec
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# ):
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# print(f'OBJ: {obj}\n')
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#
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# yield obj
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# XXX NOTE: since the below error derives from
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# `DecodeError` we need to catch is specially
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# and always raise such that spec violations
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@ -295,7 +365,8 @@ class MsgpackTCPStream(MsgTransport):
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msg: msgtypes.MsgType,
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strict_types: bool = True,
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# hide_tb: bool = False,
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hide_tb: bool = False,
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) -> None:
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'''
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Send a msgpack encoded py-object-blob-as-msg over TCP.
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@ -304,21 +375,24 @@ class MsgpackTCPStream(MsgTransport):
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invalid msg type
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'''
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# __tracebackhide__: bool = hide_tb
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__tracebackhide__: bool = hide_tb
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# XXX see `trio._sync.AsyncContextManagerMixin` for details
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# on the `.acquire()`/`.release()` sequencing..
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async with self._send_lock:
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# NOTE: lookup the `trio.Task.context`'s var for
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# the current `MsgCodec`.
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codec: MsgCodec = _ctxvar_MsgCodec.get()
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# TODO: mask out before release?
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if self._codec.pld_spec != codec.pld_spec:
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self._codec = codec
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log.runtime(
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f'Using new codec in {self}.send()\n'
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f'codec: {self._codec}\n\n'
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f'msg: {msg}\n'
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)
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# XXX for ctxvar debug only!
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# if self._codec.pld_spec != codec.pld_spec:
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# self._codec = codec
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# log.runtime(
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# f'Using new codec in {self}.send()\n'
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# f'codec: {self._codec}\n\n'
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# f'msg: {msg}\n'
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# )
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if type(msg) not in msgtypes.__msg_types__:
|
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if strict_types:
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|
|
@ -352,6 +426,16 @@ class MsgpackTCPStream(MsgTransport):
|
|||
size: bytes = struct.pack("<I", len(bytes_data))
|
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return await self.stream.send_all(size + bytes_data)
|
||||
|
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# ?TODO? does it help ever to dynamically show this
|
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# frame?
|
||||
# try:
|
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# <the-above_code>
|
||||
# except BaseException as _err:
|
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# err = _err
|
||||
# if not isinstance(err, MsgTypeError):
|
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# __tracebackhide__: bool = False
|
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# raise
|
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|
||||
@property
|
||||
def laddr(self) -> tuple[str, int]:
|
||||
return self._laddr
|
||||
|
|
@ -361,7 +445,7 @@ class MsgpackTCPStream(MsgTransport):
|
|||
return self._raddr
|
||||
|
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async def recv(self) -> Any:
|
||||
return await self._agen.asend(None)
|
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return await self._aiter_pkts.asend(None)
|
||||
|
||||
async def drain(self) -> AsyncIterator[dict]:
|
||||
'''
|
||||
|
|
@ -378,7 +462,7 @@ class MsgpackTCPStream(MsgTransport):
|
|||
yield msg
|
||||
|
||||
def __aiter__(self):
|
||||
return self._agen
|
||||
return self._aiter_pkts
|
||||
|
||||
def connected(self) -> bool:
|
||||
return self.stream.socket.fileno() != -1
|
||||
|
|
@ -433,7 +517,7 @@ class Channel:
|
|||
# set after handshake - always uid of far end
|
||||
self.uid: tuple[str, str]|None = None
|
||||
|
||||
self._agen = self._aiter_recv()
|
||||
self._aiter_msgs = self._iter_msgs()
|
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self._exc: Exception|None = None # set if far end actor errors
|
||||
self._closed: bool = False
|
||||
|
||||
|
|
@ -497,8 +581,6 @@ class Channel:
|
|||
)
|
||||
return self._transport
|
||||
|
||||
# TODO: something simliar at the IPC-`Context`
|
||||
# level so as to support
|
||||
@cm
|
||||
def apply_codec(
|
||||
self,
|
||||
|
|
@ -517,6 +599,7 @@ class Channel:
|
|||
finally:
|
||||
self._transport.codec = orig
|
||||
|
||||
# TODO: do a .src/.dst: str for maddrs?
|
||||
def __repr__(self) -> str:
|
||||
if not self._transport:
|
||||
return '<Channel with inactive transport?>'
|
||||
|
|
@ -560,27 +643,43 @@ class Channel:
|
|||
)
|
||||
return transport
|
||||
|
||||
# TODO: something like,
|
||||
# `pdbp.hideframe_on(errors=[MsgTypeError])`
|
||||
# instead of the `try/except` hack we have rn..
|
||||
# seems like a pretty useful thing to have in general
|
||||
# along with being able to filter certain stack frame(s / sets)
|
||||
# possibly based on the current log-level?
|
||||
async def send(
|
||||
self,
|
||||
payload: Any,
|
||||
|
||||
# hide_tb: bool = False,
|
||||
hide_tb: bool = False,
|
||||
|
||||
) -> None:
|
||||
'''
|
||||
Send a coded msg-blob over the transport.
|
||||
|
||||
'''
|
||||
# __tracebackhide__: bool = hide_tb
|
||||
log.transport(
|
||||
'=> send IPC msg:\n\n'
|
||||
f'{pformat(payload)}\n'
|
||||
) # type: ignore
|
||||
assert self._transport
|
||||
await self._transport.send(
|
||||
payload,
|
||||
# hide_tb=hide_tb,
|
||||
)
|
||||
__tracebackhide__: bool = hide_tb
|
||||
try:
|
||||
log.transport(
|
||||
'=> send IPC msg:\n\n'
|
||||
f'{pformat(payload)}\n'
|
||||
)
|
||||
# assert self._transport # but why typing?
|
||||
await self._transport.send(
|
||||
payload,
|
||||
hide_tb=hide_tb,
|
||||
)
|
||||
except BaseException as _err:
|
||||
err = _err # bind for introspection
|
||||
if not isinstance(_err, MsgTypeError):
|
||||
# assert err
|
||||
__tracebackhide__: bool = False
|
||||
else:
|
||||
assert err.cid
|
||||
|
||||
raise
|
||||
|
||||
async def recv(self) -> Any:
|
||||
assert self._transport
|
||||
|
|
@ -617,8 +716,11 @@ class Channel:
|
|||
await self.aclose(*args)
|
||||
|
||||
def __aiter__(self):
|
||||
return self._agen
|
||||
return self._aiter_msgs
|
||||
|
||||
# ?TODO? run any reconnection sequence?
|
||||
# -[ ] prolly should be impl-ed as deco-API?
|
||||
#
|
||||
# async def _reconnect(self) -> None:
|
||||
# """Handle connection failures by polling until a reconnect can be
|
||||
# established.
|
||||
|
|
@ -636,7 +738,6 @@ class Channel:
|
|||
# else:
|
||||
# log.transport("Stream connection re-established!")
|
||||
|
||||
# # TODO: run any reconnection sequence
|
||||
# # on_recon = self._recon_seq
|
||||
# # if on_recon:
|
||||
# # await on_recon(self)
|
||||
|
|
@ -650,11 +751,17 @@ class Channel:
|
|||
# " for re-establishment")
|
||||
# await trio.sleep(1)
|
||||
|
||||
async def _aiter_recv(
|
||||
async def _iter_msgs(
|
||||
self
|
||||
) -> AsyncGenerator[Any, None]:
|
||||
'''
|
||||
Async iterate items from underlying stream.
|
||||
Yield `MsgType` IPC msgs decoded and deliverd from
|
||||
an underlying `MsgTransport` protocol.
|
||||
|
||||
This is a streaming routine alo implemented as an async-gen
|
||||
func (same a `MsgTransport._iter_pkts()`) gets allocated by
|
||||
a `.__call__()` inside `.__init__()` where it is assigned to
|
||||
the `._aiter_msgs` attr.
|
||||
|
||||
'''
|
||||
assert self._transport
|
||||
|
|
@ -680,15 +787,6 @@ class Channel:
|
|||
case _:
|
||||
yield msg
|
||||
|
||||
# TODO: if we were gonna do this it should be
|
||||
# done up at the `MsgStream` layer!
|
||||
#
|
||||
# sent = yield item
|
||||
# if sent is not None:
|
||||
# # optimization, passing None through all the
|
||||
# # time is pointless
|
||||
# await self._transport.send(sent)
|
||||
|
||||
except trio.BrokenResourceError:
|
||||
|
||||
# if not self._autorecon:
|
||||
|
|
|
|||
|
|
@ -1197,7 +1197,7 @@ async def process_messages(
|
|||
parent_chan=chan,
|
||||
)
|
||||
|
||||
except TransportClosed:
|
||||
except TransportClosed as tc:
|
||||
# channels "breaking" (for TCP streams by EOF or 104
|
||||
# connection-reset) is ok since we don't have a teardown
|
||||
# handshake for them (yet) and instead we simply bail out of
|
||||
|
|
@ -1205,12 +1205,20 @@ async def process_messages(
|
|||
# up..
|
||||
#
|
||||
# TODO: maybe add a teardown handshake? and,
|
||||
# -[ ] don't show this msg if it's an ephemeral discovery ep call?
|
||||
# -[x] don't show this msg if it's an ephemeral discovery ep call?
|
||||
# |_ see the below `.report_n_maybe_raise()` impl as well as
|
||||
# tc-exc input details in `MsgpackTCPStream._iter_pkts()`
|
||||
# for different read-failure cases.
|
||||
# -[ ] figure out how this will break with other transports?
|
||||
log.runtime(
|
||||
f'IPC channel closed abruptly\n'
|
||||
f'<=x peer: {chan.uid}\n'
|
||||
f' |_{chan.raddr}\n'
|
||||
tc.report_n_maybe_raise(
|
||||
message=(
|
||||
f'peer IPC channel closed abruptly?\n\n'
|
||||
f'<=x {chan}\n'
|
||||
f' |_{chan.raddr}\n\n'
|
||||
)
|
||||
+
|
||||
tc.message
|
||||
|
||||
)
|
||||
|
||||
# transport **WAS** disconnected
|
||||
|
|
|
|||
Loading…
Reference in New Issue