821 lines
24 KiB
Python
821 lines
24 KiB
Python
# tractor: structured concurrent "actors".
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# Copyright 2018-eternity Tyler Goodlet.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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Inter-process comms abstractions
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"""
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from __future__ import annotations
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from collections.abc import (
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AsyncGenerator,
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AsyncIterator,
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)
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from contextlib import (
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asynccontextmanager as acm,
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contextmanager as cm,
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)
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import platform
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from pprint import pformat
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import struct
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import typing
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from typing import (
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Any,
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Callable,
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runtime_checkable,
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Protocol,
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Type,
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TypeVar,
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)
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import msgspec
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from tricycle import BufferedReceiveStream
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import trio
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from tractor.log import get_logger
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from tractor._exceptions import (
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MsgTypeError,
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pack_from_raise,
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TransportClosed,
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_mk_send_mte,
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_mk_recv_mte,
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)
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from tractor.msg import (
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_ctxvar_MsgCodec,
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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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)
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log = get_logger(__name__)
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_is_windows = platform.system() == 'Windows'
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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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tuple(lsockname[:2]),
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tuple(rsockname[:2]),
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)
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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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def __init__(self, stream: trio.SocketStream) -> None:
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...
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# XXX: should this instead be called `.sendall()`?
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async def send(self, msg: MsgType) -> None:
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...
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async def recv(self) -> MsgType:
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...
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def __aiter__(self) -> MsgType:
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...
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def connected(self) -> bool:
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...
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# defining this sync otherwise it causes a mypy error because it
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# can't figure out it's a generator i guess?..?
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def drain(self) -> AsyncIterator[dict]:
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...
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@property
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def laddr(self) -> tuple[str, int]:
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...
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@property
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def raddr(self) -> tuple[str, int]:
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...
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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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using the ``msgspec`` codec lib.
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'''
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layer_key: int = 4
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name_key: str = 'tcp'
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# TODO: better naming for this?
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# -[ ] check how libp2p does naming for such things?
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codec_key: str = 'msgpack'
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def __init__(
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self,
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stream: trio.SocketStream,
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prefix_size: int = 4,
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# XXX optionally provided codec pair for `msgspec`:
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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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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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]|None = None,
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) -> None:
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self.stream = stream
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assert self.stream.socket
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# should both be IP sockets
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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._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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self.drained: list[dict] = []
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self.recv_stream = BufferedReceiveStream(
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transport_stream=stream
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)
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self.prefix_size = prefix_size
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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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# 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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'''
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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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while True:
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try:
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header: bytes = await self.recv_stream.receive_exactly(4)
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except (
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ValueError,
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ConnectionResetError,
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# not sure entirely why we need this but without it we
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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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) 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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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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msg_bytes: bytes = await self.recv_stream.receive_exactly(size)
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log.transport(f"received {msg_bytes}") # type: ignore
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try:
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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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# 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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# 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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# are never allowed to be caught silently!
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except msgspec.ValidationError as verr:
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msgtyperr: MsgTypeError = _mk_recv_mte(
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msg=msg_bytes,
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codec=codec,
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src_validation_error=verr,
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)
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# XXX deliver up to `Channel.recv()` where
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# a re-raise and `Error`-pack can inject the far
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# end actor `.uid`.
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yield msgtyperr
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except (
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msgspec.DecodeError,
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UnicodeDecodeError,
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):
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if decodes_failed < 4:
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# ignore decoding errors for now and assume they have to
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# do with a channel drop - hope that receiving from the
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# channel will raise an expected error and bubble up.
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try:
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msg_str: str|bytes = msg_bytes.decode()
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except UnicodeDecodeError:
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msg_str = msg_bytes
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log.exception(
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'Failed to decode msg?\n'
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f'{codec}\n\n'
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'Rxed bytes from wire:\n\n'
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f'{msg_str!r}\n'
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)
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decodes_failed += 1
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else:
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raise
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async def send(
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self,
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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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) -> None:
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'''
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Send a msgpack encoded py-object-blob-as-msg over TCP.
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If `strict_types == True` then a `MsgTypeError` will be raised on any
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invalid msg type
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'''
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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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# 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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raise _mk_send_mte(
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msg,
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codec=codec,
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)
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else:
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log.warning(
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'Sending non-`Msg`-spec msg?\n\n'
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f'{msg}\n'
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)
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try:
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bytes_data: bytes = codec.encode(msg)
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except TypeError as _err:
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typerr = _err
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msgtyperr: MsgTypeError = _mk_send_mte(
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msg,
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codec=codec,
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message=(
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f'IPC-msg-spec violation in\n\n'
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f'{pretty_struct.Struct.pformat(msg)}'
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),
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src_type_error=typerr,
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)
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raise msgtyperr from typerr
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# supposedly the fastest says,
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# https://stackoverflow.com/a/54027962
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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?
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# try:
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# <the-above_code>
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# except BaseException as _err:
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# err = _err
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# if not isinstance(err, MsgTypeError):
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# __tracebackhide__: bool = False
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# raise
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@property
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def laddr(self) -> tuple[str, int]:
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return self._laddr
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@property
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def raddr(self) -> tuple[str, int]:
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return self._raddr
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async def recv(self) -> Any:
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return await self._aiter_pkts.asend(None)
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async def drain(self) -> AsyncIterator[dict]:
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'''
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Drain the stream's remaining messages sent from
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the far end until the connection is closed by
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the peer.
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'''
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try:
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async for msg in self._iter_packets():
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self.drained.append(msg)
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except TransportClosed:
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for msg in self.drained:
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yield msg
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def __aiter__(self):
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return self._aiter_pkts
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def connected(self) -> bool:
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return self.stream.socket.fileno() != -1
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def get_msg_transport(
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key: tuple[str, str],
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) -> Type[MsgTransport]:
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return {
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('msgpack', 'tcp'): MsgpackTCPStream,
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}[key]
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class Channel:
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'''
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An inter-process channel for communication between (remote) actors.
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Wraps a ``MsgStream``: transport + encoding IPC connection.
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Currently we only support ``trio.SocketStream`` for transport
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(aka TCP) and the ``msgpack`` interchange format via the ``msgspec``
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codec libary.
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'''
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def __init__(
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self,
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destaddr: tuple[str, int]|None,
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msg_transport_type_key: tuple[str, str] = ('msgpack', 'tcp'),
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# TODO: optional reconnection support?
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# auto_reconnect: bool = False,
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# on_reconnect: typing.Callable[..., typing.Awaitable] = None,
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) -> None:
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# self._recon_seq = on_reconnect
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# self._autorecon = auto_reconnect
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self._destaddr = destaddr
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self._transport_key = msg_transport_type_key
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# Either created in ``.connect()`` or passed in by
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# user in ``.from_stream()``.
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self._stream: trio.SocketStream|None = None
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self._transport: MsgTransport|None = None
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# set after handshake - always uid of far end
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self.uid: tuple[str, str]|None = None
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self._aiter_msgs = self._iter_msgs()
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self._exc: Exception|None = None # set if far end actor errors
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self._closed: bool = False
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# flag set by ``Portal.cancel_actor()`` indicating remote
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# (possibly peer) cancellation of the far end actor
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# runtime.
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self._cancel_called: bool = False
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@property
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def msgstream(self) -> MsgTransport:
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log.info(
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'`Channel.msgstream` is an old name, use `._transport`'
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)
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return self._transport
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@property
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def transport(self) -> MsgTransport:
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return self._transport
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@classmethod
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def from_stream(
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cls,
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stream: trio.SocketStream,
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**kwargs,
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) -> Channel:
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src, dst = get_stream_addrs(stream)
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chan = Channel(
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destaddr=dst,
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**kwargs,
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)
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# set immediately here from provided instance
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chan._stream: trio.SocketStream = stream
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chan.set_msg_transport(stream)
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return chan
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def set_msg_transport(
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self,
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stream: trio.SocketStream,
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type_key: tuple[str, str]|None = None,
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|
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# XXX optionally provided codec pair for `msgspec`:
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# https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
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|
codec: MsgCodec|None = None,
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|
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) -> MsgTransport:
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type_key = (
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type_key
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or
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self._transport_key
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)
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# get transport type, then
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self._transport = get_msg_transport(
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type_key
|
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# instantiate an instance of the msg-transport
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)(
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stream,
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codec=codec,
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)
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|
return self._transport
|
|
|
|
@cm
|
|
def apply_codec(
|
|
self,
|
|
codec: MsgCodec,
|
|
|
|
) -> None:
|
|
'''
|
|
Temporarily override the underlying IPC msg codec for
|
|
dynamic enforcement of messaging schema.
|
|
|
|
'''
|
|
orig: MsgCodec = self._transport.codec
|
|
try:
|
|
self._transport.codec = codec
|
|
yield
|
|
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?>'
|
|
|
|
return repr(
|
|
self._transport.stream.socket._sock
|
|
).replace( # type: ignore
|
|
"socket.socket",
|
|
"Channel",
|
|
)
|
|
|
|
@property
|
|
def laddr(self) -> tuple[str, int]|None:
|
|
return self._transport.laddr if self._transport else None
|
|
|
|
@property
|
|
def raddr(self) -> tuple[str, int]|None:
|
|
return self._transport.raddr if self._transport else None
|
|
|
|
async def connect(
|
|
self,
|
|
destaddr: tuple[Any, ...] | None = None,
|
|
**kwargs
|
|
|
|
) -> MsgTransport:
|
|
|
|
if self.connected():
|
|
raise RuntimeError("channel is already connected?")
|
|
|
|
destaddr = destaddr or self._destaddr
|
|
assert isinstance(destaddr, tuple)
|
|
|
|
stream = await trio.open_tcp_stream(
|
|
*destaddr,
|
|
**kwargs
|
|
)
|
|
transport = self.set_msg_transport(stream)
|
|
|
|
log.transport(
|
|
f'Opened channel[{type(transport)}]: {self.laddr} -> {self.raddr}'
|
|
)
|
|
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,
|
|
|
|
) -> None:
|
|
'''
|
|
Send a coded msg-blob over the transport.
|
|
|
|
'''
|
|
__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
|
|
return await self._transport.recv()
|
|
|
|
# TODO: auto-reconnect features like 0mq/nanomsg?
|
|
# -[ ] implement it manually with nods to SC prot
|
|
# possibly on multiple transport backends?
|
|
# -> seems like that might be re-inventing scalability
|
|
# prots tho no?
|
|
# try:
|
|
# return await self._transport.recv()
|
|
# except trio.BrokenResourceError:
|
|
# if self._autorecon:
|
|
# await self._reconnect()
|
|
# return await self.recv()
|
|
# raise
|
|
|
|
async def aclose(self) -> None:
|
|
|
|
log.transport(
|
|
f'Closing channel to {self.uid} '
|
|
f'{self.laddr} -> {self.raddr}'
|
|
)
|
|
assert self._transport
|
|
await self._transport.stream.aclose()
|
|
self._closed = True
|
|
|
|
async def __aenter__(self):
|
|
await self.connect()
|
|
return self
|
|
|
|
async def __aexit__(self, *args):
|
|
await self.aclose(*args)
|
|
|
|
def __aiter__(self):
|
|
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.
|
|
# """
|
|
# down = False
|
|
# while True:
|
|
# try:
|
|
# with trio.move_on_after(3) as cancel_scope:
|
|
# await self.connect()
|
|
# cancelled = cancel_scope.cancelled_caught
|
|
# if cancelled:
|
|
# log.transport(
|
|
# "Reconnect timed out after 3 seconds, retrying...")
|
|
# continue
|
|
# else:
|
|
# log.transport("Stream connection re-established!")
|
|
|
|
# # on_recon = self._recon_seq
|
|
# # if on_recon:
|
|
# # await on_recon(self)
|
|
|
|
# break
|
|
# except (OSError, ConnectionRefusedError):
|
|
# if not down:
|
|
# down = True
|
|
# log.transport(
|
|
# f"Connection to {self.raddr} went down, waiting"
|
|
# " for re-establishment")
|
|
# await trio.sleep(1)
|
|
|
|
async def _iter_msgs(
|
|
self
|
|
) -> AsyncGenerator[Any, None]:
|
|
'''
|
|
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
|
|
while True:
|
|
try:
|
|
async for msg in self._transport:
|
|
match msg:
|
|
# NOTE: if transport/interchange delivers
|
|
# a type error, we pack it with the far
|
|
# end peer `Actor.uid` and relay the
|
|
# `Error`-msg upward to the `._rpc` stack
|
|
# for normal RAE handling.
|
|
case MsgTypeError():
|
|
yield pack_from_raise(
|
|
local_err=msg,
|
|
cid=msg.cid,
|
|
|
|
# XXX we pack it here bc lower
|
|
# layers have no notion of an
|
|
# actor-id ;)
|
|
src_uid=self.uid,
|
|
)
|
|
case _:
|
|
yield msg
|
|
|
|
except trio.BrokenResourceError:
|
|
|
|
# if not self._autorecon:
|
|
raise
|
|
|
|
await self.aclose()
|
|
|
|
# if self._autorecon: # attempt reconnect
|
|
# await self._reconnect()
|
|
# continue
|
|
|
|
def connected(self) -> bool:
|
|
return self._transport.connected() if self._transport else False
|
|
|
|
|
|
@acm
|
|
async def _connect_chan(
|
|
host: str,
|
|
port: int
|
|
|
|
) -> typing.AsyncGenerator[Channel, None]:
|
|
'''
|
|
Create and connect a channel with disconnect on context manager
|
|
teardown.
|
|
|
|
'''
|
|
chan = Channel((host, port))
|
|
await chan.connect()
|
|
yield chan
|
|
with trio.CancelScope(shield=True):
|
|
await chan.aclose()
|