Flatten out RPC loop with `match:`/`case:`
Mainly expanding out the runtime endpoints for cancellation to separate cases and flattening them with the main RPC-request-invoke block, moving the non-cancel runtime case (where we call `getattr(actor, funcname)`) inside the main `Start` case (for now) which branches on `ns=="self"`. Also, add a new IPC msg `class CancelAck(Return):` which is always included in the default msg-spec such that runtime cancellation (and eventually all) endpoints return that msg (instead of a `Return`) and thus sidestep any currently applied `MsgCodec` such that the results (`bool`s for most cancel methods) are never violating the current type limit(s) on `Msg.pld`. To support this expose a new variable `return_msg: Return|CancelAck` param from `_invoke()`/`_invoke_non_context)()` and set it to `CancelAck` in the appropriate endpoint case-blocks of the msg loop. Clean out all the lingering legacy `chan.send(<dict-msg>)` commented codez from the invoker funcs, with more cleaning likely to come B)runtime_to_msgspec
Tyler Goodlet
parent
b9a61ded0a
commit
aca6503fcd
244
tractor/_rpc.py
244
tractor/_rpc.py
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@ -61,13 +61,15 @@ from .devx import (
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from . import _state
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from .log import get_logger
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from tractor.msg.types import (
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CancelAck,
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Error,
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Msg,
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Return,
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Start,
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StartAck,
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Started,
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Stop,
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Yield,
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Return,
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Error,
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)
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@ -89,6 +91,7 @@ async def _invoke_non_context(
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treat_as_gen: bool,
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is_rpc: bool,
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return_msg: Return|CancelAck = Return,
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task_status: TaskStatus[
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Context | BaseException
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@ -97,7 +100,6 @@ async def _invoke_non_context(
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# TODO: can we unify this with the `context=True` impl below?
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if inspect.isasyncgen(coro):
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# await chan.send({
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await chan.send(
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StartAck(
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cid=cid,
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@ -123,11 +125,6 @@ async def _invoke_non_context(
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# to_send = await chan.recv_nowait()
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# if to_send is not None:
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# to_yield = await coro.asend(to_send)
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# await chan.send({
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# # Yield()
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# 'cid': cid,
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# 'yield': item,
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# })
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await chan.send(
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Yield(
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cid=cid,
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@ -142,11 +139,6 @@ async def _invoke_non_context(
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await chan.send(
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Stop(cid=cid)
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)
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# await chan.send({
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# # Stop(
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# 'cid': cid,
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# 'stop': True,
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# })
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# one way @stream func that gets treated like an async gen
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# TODO: can we unify this with the `context=True` impl below?
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@ -157,11 +149,6 @@ async def _invoke_non_context(
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functype='asyncgen',
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)
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)
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# await chan.send({
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# # StartAck()
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# 'cid': cid,
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# 'functype': 'asyncgen',
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# })
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# XXX: the async-func may spawn further tasks which push
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# back values like an async-generator would but must
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# manualy construct the response dict-packet-responses as
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@ -177,11 +164,6 @@ async def _invoke_non_context(
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await chan.send(
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Stop(cid=cid)
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)
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# await chan.send({
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# # Stop(
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# 'cid': cid,
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# 'stop': True,
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# })
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else:
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# regular async function/method
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# XXX: possibly just a scheduled `Actor._cancel_task()`
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@ -199,11 +181,6 @@ async def _invoke_non_context(
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functype='asyncfunc',
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)
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)
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# await chan.send({
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# # StartAck()
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# 'cid': cid,
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# 'functype': 'asyncfunc',
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# })
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except (
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trio.ClosedResourceError,
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trio.BrokenResourceError,
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@ -237,13 +214,8 @@ async def _invoke_non_context(
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and chan.connected()
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):
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try:
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# await chan.send({
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# # Return()
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# 'cid': cid,
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# 'return': result,
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# })
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await chan.send(
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Return(
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return_msg(
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cid=cid,
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pld=result,
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)
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@ -408,6 +380,7 @@ async def _invoke(
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is_rpc: bool = True,
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hide_tb: bool = True,
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return_msg: Return|CancelAck = Return,
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task_status: TaskStatus[
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Context | BaseException
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@ -517,6 +490,7 @@ async def _invoke(
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kwargs,
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treat_as_gen,
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is_rpc,
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return_msg,
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task_status,
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)
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# below is only for `@context` funcs
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@ -547,11 +521,6 @@ async def _invoke(
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functype='context',
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)
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)
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# await chan.send({
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# # StartAck()
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# 'cid': cid,
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# 'functype': 'context',
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# })
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# TODO: should we also use an `.open_context()` equiv
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# for this callee side by factoring the impl from
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@ -576,16 +545,11 @@ async def _invoke(
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# deliver final result to caller side.
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await chan.send(
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Return(
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return_msg(
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cid=cid,
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pld=res,
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)
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)
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# await chan.send({
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# # Return()
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# 'cid': cid,
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# 'return': res,
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# })
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# NOTE: this happens IFF `ctx._scope.cancel()` is
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# called by any of,
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@ -674,7 +638,6 @@ async def _invoke(
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ctxc = ContextCancelled(
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msg,
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boxed_type=trio.Cancelled,
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# boxed_type_str='Cancelled',
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canceller=canceller,
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)
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# assign local error so that the `.outcome`
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@ -775,12 +738,12 @@ async def try_ship_error_to_remote(
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trio.BrokenResourceError,
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BrokenPipeError,
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):
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# err_msg: dict = msg['error']['tb_str']
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log.critical(
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'IPC transport failure -> '
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f'failed to ship error to {remote_descr}!\n\n'
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f'X=> {channel.uid}\n\n'
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# f'{err_msg}\n'
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# TODO: use `.msg.preetty_struct` for this!
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f'{msg}\n'
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)
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@ -822,6 +785,8 @@ async def process_messages(
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'''
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assert actor._service_n # state sanity
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# TODO: once `trio` get's an "obvious way" for req/resp we
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# should use it?
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# https://github.com/python-trio/trio/issues/467
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@ -831,7 +796,7 @@ async def process_messages(
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f'|_{chan}\n'
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)
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nursery_cancelled_before_task: bool = False
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msg: dict | None = None
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msg: Msg|None = None
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try:
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# NOTE: this internal scope allows for keeping this
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# message loop running despite the current task having
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@ -840,6 +805,7 @@ async def process_messages(
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# using ``scope = Nursery.start()``
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with CancelScope(shield=shield) as loop_cs:
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task_status.started(loop_cs)
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async for msg in chan:
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log.transport( # type: ignore
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f'<= IPC msg from peer: {chan.uid}\n\n'
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@ -894,21 +860,18 @@ async def process_messages(
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# cid,
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# channel,
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# requesting_uid=channel.uid,
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# ipc_msg=msg,
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# )
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# # immediately break out of this loop!
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# break
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# cid = msg.get('cid')
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# if cid:
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case (
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StartAck(cid=cid)
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| Started(cid=cid)
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| Yield(cid=cid)
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| Stop(cid=cid)
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| Return(cid=cid)
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| CancelAck(cid=cid)
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| Error(cid=cid)
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):
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# deliver response to local caller/waiter
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@ -918,68 +881,21 @@ async def process_messages(
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cid,
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msg,
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)
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# TODO: can remove right?
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# continue
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log.runtime(
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'Waiting on next IPC msg from\n'
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f'peer: {chan.uid}:\n'
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f'|_{chan}\n'
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# f'last msg: {msg}\n'
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)
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continue
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# process a 'cmd' request-msg upack
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# TODO: impl with native `msgspec.Struct` support !!
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# -[ ] implement with ``match:`` syntax?
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# -[ ] discard un-authed msgs as per,
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# <TODO put issue for typed msging structs>
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# runtime-internal cancellation endpoints
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case Start(
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ns='self',
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func='cancel',
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cid=cid,
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ns=ns,
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func=funcname,
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kwargs=kwargs, # type-spec this? see `msg.types`
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uid=actorid,
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kwargs=kwargs,
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):
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# try:
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# (
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# ns,
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# funcname,
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# kwargs,
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# actorid,
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# cid,
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# ) = msg['cmd']
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kwargs |= {'req_chan': chan}
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# # TODO: put in `case Error():` right?
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# except KeyError:
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# # This is the non-rpc error case, that is, an
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# # error **not** raised inside a call to ``_invoke()``
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# # (i.e. no cid was provided in the msg - see above).
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# # Push this error to all local channel consumers
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# # (normally portals) by marking the channel as errored
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# assert chan.uid
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# exc = unpack_error(msg, chan=chan)
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# chan._exc = exc
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# raise exc
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log.runtime(
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'Handling RPC `Start` request from\n'
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f'peer: {actorid}\n'
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'\n'
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f'=> {ns}.{funcname}({kwargs})\n'
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)
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# case Start(
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# ns='self',
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# funcname='cancel',
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# ):
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if ns == 'self':
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if funcname == 'cancel':
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func: Callable = actor.cancel
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kwargs |= {
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'req_chan': chan,
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}
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# don't start entire actor runtime cancellation
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# if this actor is currently in debug mode!
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# XXX NOTE XXX don't start entire actor
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# runtime cancellation if this actor is
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# currently in debug mode!
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pdb_complete: trio.Event|None = _debug.Lock.local_pdb_complete
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if pdb_complete:
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await pdb_complete.wait()
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@ -994,9 +910,10 @@ async def process_messages(
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actor,
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cid,
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chan,
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func,
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actor.cancel,
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kwargs,
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is_rpc=False,
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return_msg=CancelAck,
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)
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log.runtime(
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@ -1006,41 +923,31 @@ async def process_messages(
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loop_cs.cancel()
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break
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# case Start(
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# ns='self',
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# funcname='_cancel_task',
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# ):
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if funcname == '_cancel_task':
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func: Callable = actor._cancel_task
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# we immediately start the runtime machinery
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# shutdown
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# with CancelScope(shield=True):
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case Start(
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ns='self',
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func='_cancel_task',
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cid=cid,
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kwargs=kwargs,
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):
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target_cid: str = kwargs['cid']
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kwargs |= {
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# NOTE: ONLY the rpc-task-owning
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'requesting_uid': chan.uid,
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'ipc_msg': msg,
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# XXX NOTE! ONLY the rpc-task-owning
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# parent IPC channel should be able to
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# cancel it!
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'parent_chan': chan,
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'requesting_uid': chan.uid,
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'ipc_msg': msg,
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}
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# TODO: remove? already have emit in meth.
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# log.runtime(
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# f'Rx RPC task cancel request\n'
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# f'<= canceller: {chan.uid}\n'
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# f' |_{chan}\n\n'
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# f'=> {actor}\n'
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# f' |_cid: {target_cid}\n'
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# )
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try:
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await _invoke(
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actor,
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cid,
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chan,
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func,
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actor._cancel_task,
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kwargs,
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is_rpc=False,
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return_msg=CancelAck,
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)
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except BaseException:
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log.exception(
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@ -1050,29 +957,43 @@ async def process_messages(
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f'=> {actor}\n'
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f' |_cid: {target_cid}\n'
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)
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continue
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# case Start(
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# ns='self',
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# funcname='register_actor',
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# ):
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else:
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# normally registry methods, eg.
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# ``.register_actor()`` etc.
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# the "MAIN" RPC endpoint to schedule-a-`trio.Task`
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#
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# TODO: impl with native `msgspec.Struct` support !!
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# -[ ] implement with ``match:`` syntax?
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# -[ ] discard un-authed msgs as per,
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# <TODO put issue for typed msging structs>
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case Start(
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cid=cid,
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ns=ns,
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func=funcname,
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kwargs=kwargs, # type-spec this? see `msg.types`
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uid=actorid,
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):
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log.runtime(
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'Handling RPC `Start` request from\n'
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f'peer: {actorid}\n'
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'\n'
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f'=> {ns}.{funcname}({kwargs})\n'
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)
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|
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# runtime-internal endpoint: `Actor.<funcname>`
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# only registry methods exist now yah,
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# like ``.register_actor()`` etc. ?
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if ns == 'self':
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func: Callable = getattr(actor, funcname)
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# case Start(
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# ns=str(),
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# funcname=funcname,
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# ):
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# application RPC endpoint
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else:
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# complain to client about restricted modules
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try:
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func = actor._get_rpc_func(ns, funcname)
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func: Callable = actor._get_rpc_func(ns, funcname)
|
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except (
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ModuleNotExposed,
|
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AttributeError,
|
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) as err:
|
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# always complain to requester
|
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# client about un-enabled modules
|
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err_msg: dict[str, dict] = pack_error(
|
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err,
|
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cid=cid,
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|
|
@ -1082,6 +1003,7 @@ async def process_messages(
|
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|
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# schedule a task for the requested RPC function
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# in the actor's main "service nursery".
|
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#
|
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# TODO: possibly a service-tn per IPC channel for
|
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# supervision isolation? would avoid having to
|
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# manage RPC tasks individually in `._rpc_tasks`
|
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|
|
@ -1090,7 +1012,7 @@ async def process_messages(
|
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f'Spawning task for RPC request\n'
|
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f'<= caller: {chan.uid}\n'
|
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f' |_{chan}\n\n'
|
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# TODO: maddr style repr?
|
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# ^-TODO-^ maddr style repr?
|
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# f' |_@ /ipv4/{chan.raddr}/tcp/{chan.rport}/'
|
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# f'cid="{cid[-16:]} .."\n\n'
|
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|
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|
|
@ -1098,7 +1020,6 @@ async def process_messages(
|
|||
f' |_cid: {cid}\n'
|
||||
f' |>> {func}()\n'
|
||||
)
|
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assert actor._service_n # wait why? do it at top?
|
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try:
|
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ctx: Context = await actor._service_n.start(
|
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partial(
|
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|
|
@ -1128,13 +1049,12 @@ async def process_messages(
|
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log.warning(
|
||||
'Task for RPC failed?'
|
||||
f'|_ {func}()\n\n'
|
||||
|
||||
f'{err}'
|
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)
|
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continue
|
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|
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else:
|
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# mark that we have ongoing rpc tasks
|
||||
# mark our global state with ongoing rpc tasks
|
||||
actor._ongoing_rpc_tasks = trio.Event()
|
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|
||||
# store cancel scope such that the rpc task can be
|
||||
|
|
@ -1146,22 +1066,23 @@ async def process_messages(
|
|||
)
|
||||
|
||||
case Error() | _:
|
||||
# This is the non-rpc error case, that is, an
|
||||
# error **not** raised inside a call to ``_invoke()``
|
||||
# (i.e. no cid was provided in the msg - see above).
|
||||
# Push this error to all local channel consumers
|
||||
# (normally portals) by marking the channel as errored
|
||||
# NOTE: this is the non-rpc error case,
|
||||
# that is, an error **not** raised inside
|
||||
# a call to ``_invoke()`` (i.e. no cid was
|
||||
# provided in the msg - see above). Push
|
||||
# this error to all local channel
|
||||
# consumers (normally portals) by marking
|
||||
# the channel as errored
|
||||
log.exception(
|
||||
f'Unhandled IPC msg:\n\n'
|
||||
f'{msg}\n'
|
||||
)
|
||||
assert chan.uid
|
||||
exc = unpack_error(
|
||||
# assert chan.uid
|
||||
chan._exc: Exception = unpack_error(
|
||||
msg,
|
||||
chan=chan,
|
||||
)
|
||||
chan._exc = exc
|
||||
raise exc
|
||||
raise chan._exc
|
||||
|
||||
log.runtime(
|
||||
'Waiting on next IPC msg from\n'
|
||||
|
|
@ -1172,7 +1093,8 @@ async def process_messages(
|
|||
# end of async for, channel disconnect vis
|
||||
# ``trio.EndOfChannel``
|
||||
log.runtime(
|
||||
f"{chan} for {chan.uid} disconnected, cancelling tasks"
|
||||
f'channel for {chan.uid} disconnected, cancelling RPC tasks\n'
|
||||
f'|_{chan}\n'
|
||||
)
|
||||
await actor.cancel_rpc_tasks(
|
||||
req_uid=actor.uid,
|
||||
|
|
|
|||
|
|
@ -454,6 +454,10 @@ _runtime_msgs: list[Msg] = [
|
|||
# emission from `MsgStream.aclose()`
|
||||
Stop,
|
||||
|
||||
# `Return` sub-type that we always accept from
|
||||
# runtime-internal cancel endpoints
|
||||
CancelAck,
|
||||
|
||||
# box remote errors, normally subtypes
|
||||
# of `RemoteActorError`.
|
||||
Error,
|
||||
|
|
|
|||
Loading…
Reference in New Issue