mirror of
https://github.com/mofeng-git/One-KVM.git
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124 lines
4.3 KiB
Python
124 lines
4.3 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) 2018-2024 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 asyncio
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import threading
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import dataclasses
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#import gpiod
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from . import aiotools
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# =====
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@dataclasses.dataclass(frozen=True)
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class AioReaderPinParams:
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inverted: bool
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debounce: float
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class AioReader: # pylint: disable=too-many-instance-attributes
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def __init__(
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self,
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path: str,
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consumer: str,
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pins: dict[int, AioReaderPinParams],
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notifier: aiotools.AioNotifier,
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) -> None:
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self.__path = path
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self.__consumer = consumer
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self.__pins = dict(pins)
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self.__notifier = notifier
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self.__values: (dict[int, _DebouncedValue] | None) = None
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self.__thread = threading.Thread(target=self.__run, daemon=True)
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self.__stop_event = threading.Event()
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self.__loop: (asyncio.AbstractEventLoop | None) = None
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def get(self, pin: int) -> bool:
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value = (self.__values[pin].get() if self.__values is not None else False)
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return (value ^ self.__pins[pin].inverted)
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async def poll(self) -> None:
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if not self.__pins:
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await aiotools.wait_infinite()
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else:
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assert self.__loop is None
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self.__loop = asyncio.get_running_loop()
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self.__thread.start()
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try:
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await aiotools.run_async(self.__thread.join)
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finally:
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self.__stop_event.set()
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await aiotools.run_async(self.__thread.join)
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def __run(self) -> None:
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assert self.__values is None
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assert self.__loop
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pins = sorted(self.__pins)
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class _DebouncedValue:
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def __init__(
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self,
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initial: bool,
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debounce: float,
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notifier: aiotools.AioNotifier,
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loop: asyncio.AbstractEventLoop,
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) -> None:
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self.__value = initial
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self.__debounce = debounce
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self.__notifier = notifier
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self.__loop = loop
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self.__queue: "asyncio.Queue[bool]" = asyncio.Queue() # type: ignore
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self.__task = loop.create_task(self.__consumer_task_loop())
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def set(self, value: bool) -> None:
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if self.__loop.is_running():
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self.__check_alive()
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self.__loop.call_soon_threadsafe(self.__queue.put_nowait, value)
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def get(self) -> bool:
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return self.__value
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def __check_alive(self) -> None:
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if self.__task.done() and not self.__task.cancelled():
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raise RuntimeError("Dead debounce consumer")
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async def __consumer_task_loop(self) -> None:
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while True:
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value = await self.__queue.get()
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while not self.__queue.empty():
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value = await self.__queue.get()
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if self.__value != value:
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self.__value = value
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self.__notifier.notify()
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await asyncio.sleep(self.__debounce)
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