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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018 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 types
from typing import Type
# =====
class RegionIsBusyError(Exception):
def __init__(self) -> None:
super().__init__("Performing another operation, please try again later")
class AioExclusiveRegion:
def __init__(self, exc_type: Type[RegionIsBusyError]) -> None:
self.__exc_type = exc_type
self.__busy = False
def is_busy(self) -> bool:
return self.__busy
def enter(self) -> None:
if not self.__busy:
self.__busy = True
return
raise self.__exc_type()
def exit(self) -> None:
self.__busy = False
def __enter__(self) -> None:
self.enter()
def __exit__(
self,
_exc_type: Type[BaseException],
_exc: BaseException,
_tb: types.TracebackType,
) -> None:
self.exit()
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