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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import multiprocessing
import queue
from typing import Type
from typing import TypeVar
from typing import Generic
from . import aiotools
# =====
_QueueItemT = TypeVar("_QueueItemT")
async def queue_get_last( # pylint: disable=invalid-name
q: "multiprocessing.Queue[_QueueItemT]",
timeout: float,
) -> tuple[bool, (_QueueItemT | None)]:
return (await aiotools.run_async(queue_get_last_sync, q, timeout))
def queue_get_last_sync( # pylint: disable=invalid-name
q: "multiprocessing.Queue[_QueueItemT]",
timeout: float,
) -> tuple[bool, (_QueueItemT | None)]:
try:
item = q.get(timeout=timeout)
while not q.empty():
item = q.get()
return (True, item)
except queue.Empty:
return (False, None)
# =====
class AioProcessNotifier:
def __init__(self) -> None:
self.__queue: "multiprocessing.Queue[None]" = multiprocessing.Queue()
def notify(self) -> None:
self.__queue.put_nowait(None)
async def wait(self) -> None:
while not (await queue_get_last(self.__queue, 0.1))[0]:
pass
# =====
_SharedFlagT = TypeVar("_SharedFlagT", int, bool)
class AioSharedFlags(Generic[_SharedFlagT]):
def __init__(
self,
initial: dict[str, _SharedFlagT],
notifier: AioProcessNotifier,
type: Type[_SharedFlagT]=bool, # pylint: disable=redefined-builtin
) -> None:
self.__notifier = notifier
self.__type: Type[_SharedFlagT] = type
self.__flags = {
key: multiprocessing.RawValue("i", int(value)) # type: ignore
for (key, value) in initial.items()
}
self.__lock = multiprocessing.Lock()
def update(self, **kwargs: _SharedFlagT) -> None:
changed = False
with self.__lock:
for (key, value) in kwargs.items():
value = int(value) # type: ignore
if self.__flags[key].value != value:
self.__flags[key].value = value
changed = True
if changed:
self.__notifier.notify()
async def get(self) -> dict[str, _SharedFlagT]:
return (await aiotools.run_async(self.__inner_get))
def __inner_get(self) -> dict[str, _SharedFlagT]:
with self.__lock:
return {
key: self.__type(shared.value)
for (key, shared) in self.__flags.items()
}
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