mirror of
https://github.com/mofeng-git/One-KVM.git
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114 lines
3.9 KiB
Python
114 lines
3.9 KiB
Python
# ========================================================================== #
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# #
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# KVMD - The main PiKVM daemon. #
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# #
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# Copyright (C) 2018-2023 Maxim Devaev <mdevaev@gmail.com> #
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# #
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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 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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# #
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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 General Public License for more details. #
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# #
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# You should have received a copy of the GNU 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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# ========================================================================== #
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import multiprocessing
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import queue
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from typing import Type
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from typing import TypeVar
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from typing import Generic
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from . import aiotools
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# =====
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_QueueItemT = TypeVar("_QueueItemT")
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async def queue_get_last( # pylint: disable=invalid-name
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q: "multiprocessing.Queue[_QueueItemT]",
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timeout: float,
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) -> tuple[bool, (_QueueItemT | None)]:
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return (await aiotools.run_async(queue_get_last_sync, q, timeout))
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def queue_get_last_sync( # pylint: disable=invalid-name
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q: "multiprocessing.Queue[_QueueItemT]",
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timeout: float,
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) -> tuple[bool, (_QueueItemT | None)]:
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try:
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item = q.get(timeout=timeout)
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while not q.empty():
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item = q.get()
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return (True, item)
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except queue.Empty:
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return (False, None)
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# =====
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class AioProcessNotifier:
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def __init__(self) -> None:
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self.__queue: "multiprocessing.Queue[None]" = multiprocessing.Queue()
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def notify(self) -> None:
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self.__queue.put_nowait(None)
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async def wait(self) -> None:
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while not (await queue_get_last(self.__queue, 0.1))[0]:
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pass
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# =====
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_SharedFlagT = TypeVar("_SharedFlagT", int, bool)
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class AioSharedFlags(Generic[_SharedFlagT]):
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def __init__(
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self,
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initial: dict[str, _SharedFlagT],
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notifier: AioProcessNotifier,
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type: Type[_SharedFlagT]=bool, # pylint: disable=redefined-builtin
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) -> None:
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self.__notifier = notifier
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self.__type: Type[_SharedFlagT] = type
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self.__flags = {
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key: multiprocessing.RawValue("i", int(value)) # type: ignore
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for (key, value) in initial.items()
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}
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self.__lock = multiprocessing.Lock()
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def update(self, **kwargs: _SharedFlagT) -> None:
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changed = False
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with self.__lock:
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for (key, value) in kwargs.items():
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value = int(value) # type: ignore
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if self.__flags[key].value != value:
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self.__flags[key].value = value
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changed = True
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if changed:
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self.__notifier.notify()
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async def get(self) -> dict[str, _SharedFlagT]:
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return (await aiotools.run_async(self.__inner_get))
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def __inner_get(self) -> dict[str, _SharedFlagT]:
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with self.__lock:
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return {
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key: self.__type(shared.value)
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for (key, shared) in self.__flags.items()
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}
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