Add a new one-way stream API
NB: this is a breaking change removing support for `Portal.run()` being able to invoke remote streaming functions and instead replacing the method call with an async context manager api `Portal.open_stream_from()` This style explicitly defines stream teardown at the call site instead of expecting the user to handle tricky things correctly themselves: eg. `async_geneartor.aclosing()`. Going forward `Portal.run()` can be used only for invoking async functions.stream_contexts
Tyler Goodlet
parent
81f3558494
commit
36251357b3
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@ -3,8 +3,10 @@ Portal api
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"""
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import importlib
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import inspect
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import typing
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from typing import Tuple, Any, Dict, Optional, Set
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from typing import (
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Tuple, Any, Dict, Optional, Set,
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Callable, AsyncGenerator
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)
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from functools import partial
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from dataclasses import dataclass
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import warnings
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@ -26,7 +28,7 @@ log = get_logger(__name__)
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async def maybe_open_nursery(
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nursery: trio.Nursery = None,
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shield: bool = False,
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) -> typing.AsyncGenerator[trio.Nursery, Any]:
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) -> AsyncGenerator[trio.Nursery, Any]:
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"""Create a new nursery if None provided.
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Blocks on exit as expected if no input nursery is provided.
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@ -39,6 +41,13 @@ async def maybe_open_nursery(
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yield nursery
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def func_deats(func: Callable) -> Tuple[str, str]:
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return (
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func.__module__,
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func.__name__,
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)
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class Portal:
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"""A 'portal' to a(n) (remote) ``Actor``.
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@ -105,48 +114,15 @@ class Portal:
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"A pending main result has already been submitted"
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self._expect_result = await self._submit(ns, func, kwargs)
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async def run_from_ns(
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self,
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namespace_path: str,
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function_name: str,
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**kwargs,
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) -> Any:
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"""Run a function from a (remote) namespace in a new task on the far-end actor.
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This is a more explitcit way to run tasks in a remote-process
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actor using explicit object-path syntax. Hint: this is how
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`.run()` works underneath.
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Note::
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A special namespace `self` can be used to invoke `Actor`
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instance methods in the remote runtime. Currently this should only
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be used for `tractor` internals.
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"""
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return await self._return_from_resptype(
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*(await self._submit(namespace_path, function_name, kwargs))
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)
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async def _return_from_resptype(
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async def _return_once(
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self,
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cid: str,
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recv_chan: trio.abc.ReceiveChannel,
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resptype: str,
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first_msg: dict
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) -> Any:
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assert resptype == 'asyncfunc' # single response
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# receive only stream
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if resptype == 'asyncgen':
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ctx = Context(self.channel, cid, _portal=self)
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rchan = ReceiveMsgStream(ctx, recv_chan, self)
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self._streams.add(rchan)
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return rchan
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elif resptype == 'context': # context manager style setup/teardown
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# TODO likely not here though
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raise NotImplementedError
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elif resptype == 'asyncfunc': # single response
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msg = await recv_chan.receive()
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try:
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return msg['return']
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@ -154,8 +130,6 @@ class Portal:
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# internal error should never get here
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assert msg.get('cid'), "Received internal error at portal?"
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raise unpack_error(msg, self.channel)
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else:
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raise ValueError(f"Unknown msg response type: {first_msg}")
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async def result(self) -> Any:
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"""Return the result(s) from the remote actor's "main" task.
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@ -178,9 +152,7 @@ class Portal:
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assert self._expect_result
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if self._result is None:
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try:
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self._result = await self._return_from_resptype(
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*self._expect_result
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)
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self._result = await self._return_once(*self._expect_result)
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except RemoteActorError as err:
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self._result = err
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@ -247,6 +219,28 @@ class Portal:
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f"{self.channel} for {self.channel.uid} was already closed?")
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return False
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async def run_from_ns(
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self,
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namespace_path: str,
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function_name: str,
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**kwargs,
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) -> Any:
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"""Run a function from a (remote) namespace in a new task on the far-end actor.
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This is a more explitcit way to run tasks in a remote-process
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actor using explicit object-path syntax. Hint: this is how
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`.run()` works underneath.
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Note::
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A special namespace `self` can be used to invoke `Actor`
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instance methods in the remote runtime. Currently this should only
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be used for `tractor` internals.
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"""
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return await self._return_once(
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*(await self._submit(namespace_path, function_name, kwargs))
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)
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async def run(
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self,
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func: str,
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@ -272,30 +266,57 @@ class Portal:
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assert isinstance(fn_name, str)
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else: # function reference was passed directly
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# TODO: ensure async
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if not (
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inspect.isasyncgenfunction(func) or
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inspect.iscoroutinefunction(func)
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):
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raise TypeError(f'{func} must be an async function!')
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fn = func
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fn_mod_path = fn.__module__
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fn_name = fn.__name__
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fn_mod_path, fn_name = func_deats(func)
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return await self._return_from_resptype(
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return await self._return_once(
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*(await self._submit(fn_mod_path, fn_name, kwargs))
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)
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# @asynccontextmanager
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# async def open_stream_from(
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# self,
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# async_gen: 'AsyncGeneratorFunction',
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# **kwargs,
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# ) -> ReceiveMsgStream:
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# # TODO
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# pass
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@asynccontextmanager
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async def open_stream_from(
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self,
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async_gen_func: Callable, # typing: ignore
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**kwargs,
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) -> AsyncGenerator[ReceiveMsgStream, None]:
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if not inspect.isasyncgenfunction(async_gen_func):
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if not inspect.iscoroutinefunction(async_gen_func) or (
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not getattr(async_gen_func, '_tractor_stream_function', False)
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):
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raise TypeError(
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f'{async_gen_func} must be an async generator function!')
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fn_mod_path, fn_name = func_deats(async_gen_func)
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(
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cid,
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recv_chan,
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functype,
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first_msg
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) = await self._submit(fn_mod_path, fn_name, kwargs)
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# receive only stream
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assert functype == 'asyncgen'
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ctx = Context(self.channel, cid, _portal=self)
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try:
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async with ReceiveMsgStream(ctx, recv_chan, self) as rchan:
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self._streams.add(rchan)
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yield rchan
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finally:
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# cancel the far end task on consumer close
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try:
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await ctx.cancel()
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except trio.ClosedResourceError:
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# if the far end terminates before we send a cancel the
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# underlying transport-channel may already be closed.
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log.debug(f'Context {ctx} was already closed?')
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self._streams.remove(rchan)
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# @asynccontextmanager
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# async def open_context(
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@ -304,7 +325,9 @@ class Portal:
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# **kwargs,
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# ) -> Context:
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# # TODO
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# pass
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# elif resptype == 'context': # context manager style setup/teardown
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# # TODO likely not here though
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# raise NotImplementedError
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@dataclass
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@ -324,10 +347,7 @@ class LocalPortal:
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"""
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obj = self.actor if ns == 'self' else importlib.import_module(ns)
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func = getattr(obj, func_name)
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if inspect.iscoroutinefunction(func):
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return await func(**kwargs)
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else:
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return func(**kwargs)
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@asynccontextmanager
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@ -336,7 +356,7 @@ async def open_portal(
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nursery: Optional[trio.Nursery] = None,
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start_msg_loop: bool = True,
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shield: bool = False,
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) -> typing.AsyncGenerator[Portal, None]:
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) -> AsyncGenerator[Portal, None]:
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"""Open a ``Portal`` through the provided ``channel``.
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Spawns a background task to handle message processing.
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