81 lines
2.1 KiB
Python
81 lines
2.1 KiB
Python
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# piker: trading gear for hackers
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# Copyright (C) Tyler Goodlet (in stewardship of piker0)
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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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sugarz for trio/tractor conc peeps.
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'''
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from typing import AsyncContextManager
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from typing import TypeVar
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from contextlib import asynccontextmanager as acm
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import trio
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# A regular invariant generic type
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T = TypeVar("T")
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async def _enter_and_sleep(
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mngr: AsyncContextManager[T],
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to_yield: dict[int, T],
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all_entered: trio.Event,
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# task_status: TaskStatus[T] = trio.TASK_STATUS_IGNORED,
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) -> T:
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'''Open the async context manager deliver it's value
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to this task's spawner and sleep until cancelled.
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'''
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async with mngr as value:
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to_yield[id(mngr)] = value
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if all(to_yield.values()):
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all_entered.set()
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# sleep until cancelled
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await trio.sleep_forever()
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@acm
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async def async_enter_all(
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*mngrs: list[AsyncContextManager[T]],
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) -> tuple[T]:
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to_yield = {}.fromkeys(id(mngr) for mngr in mngrs)
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all_entered = trio.Event()
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async with trio.open_nursery() as n:
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for mngr in mngrs:
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n.start_soon(
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_enter_and_sleep,
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mngr,
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to_yield,
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all_entered,
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)
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# deliver control once all managers have started up
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await all_entered.wait()
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yield tuple(to_yield.values())
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# tear down all sleeper tasks thus triggering individual
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# mngr ``__aexit__()``s.
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n.cancel_scope.cancel()
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