mirror of
https://github.com/mofeng-git/One-KVM.git
synced 2025-12-12 01:00:29 +08:00
127 lines
4.7 KiB
Python
127 lines
4.7 KiB
Python
# ========================================================================== #
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# #
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# KVMD - The main Pi-KVM daemon. #
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# #
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# Copyright (C) 2018 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 os
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import asyncio
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import threading
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from typing import Tuple
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from typing import Dict
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from typing import Optional
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import gpiod
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from . import aiotools
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# =====
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# XXX: Do not use this variable for any purpose other than testing.
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# It can be removed at any time.
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DEVICE_PATH = os.getenv("KVMD_GPIO_DEVICE_PATH", "/dev/gpiochip0")
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# =====
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async def pulse(line: gpiod.Line, delay: float, final: float) -> None:
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try:
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line.set_value(1)
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await asyncio.sleep(delay)
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finally:
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line.set_value(0)
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await asyncio.sleep(final)
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class AioPinsReader: # 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, bool],
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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 = pins
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self.__notifier = notifier
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self.__state = dict.fromkeys(pins, False)
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self.__stop_event = threading.Event()
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self.__loop: Optional[asyncio.AbstractEventLoop] = None
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self.__thread = threading.Thread(target=self.__run, daemon=True)
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def get(self, pin: int) -> bool:
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return (self.__state[pin] ^ self.__pins[pin])
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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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with gpiod.Chip(self.__path) as chip:
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pins = sorted(self.__pins)
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lines = chip.get_lines(pins)
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lines.request(self.__consumer, gpiod.LINE_REQ_EV_BOTH_EDGES)
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lines.event_wait(nsec=1)
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self.__state = {
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pin: bool(value)
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for (pin, value) in zip(pins, lines.get_values())
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}
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self.__notify()
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while not self.__stop_event.is_set():
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ev_lines = lines.event_wait(1)
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if ev_lines:
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changed = False
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for ev_line in ev_lines:
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events = ev_line.event_read_multiply()
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if events:
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(pin, value) = self.__parse_event(events[-1])
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if self.__state[pin] != value:
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self.__state[pin] = value
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changed = True
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if changed:
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self.__notify()
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def __parse_event(self, event: gpiod.LineEvent) -> Tuple[int, bool]:
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pin = event.source.offset()
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if event.type == gpiod.LineEvent.RISING_EDGE:
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return (pin, True)
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elif event.type == gpiod.LineEvent.FALLING_EDGE:
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return (pin, False)
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raise RuntimeError(f"Invalid event {event} type: {event.type}")
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def __notify(self) -> None:
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assert self.__loop
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self.__loop.call_soon_threadsafe(self.__notifier.notify_sync)
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