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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 os
import asyncio
import asyncio.queues
import functools
import types
import typing
from typing import Tuple
from typing import List
from typing import Set
from typing import Callable
from typing import Awaitable
from typing import Coroutine
from typing import Type
from typing import TypeVar
from typing import Optional
from typing import Any
import aiofiles
import aiofiles.base
from .logging import get_logger
# =====
_ATTR_SHORT_TASK = "_aiotools_short_task"
_MethodT = TypeVar("_MethodT", bound=Callable[..., Any])
_RetvalT = TypeVar("_RetvalT")
# =====
def atomic(method: _MethodT) -> _MethodT:
@functools.wraps(method)
async def wrapper(*args: Any, **kwargs: Any) -> Any:
return (await asyncio.shield(method(*args, **kwargs)))
return typing.cast(_MethodT, wrapper)
# =====
def create_short_task(coro: Coroutine) -> asyncio.Task:
task = asyncio.create_task(coro)
setattr(task, _ATTR_SHORT_TASK, True)
return task
def get_short_tasks() -> List[asyncio.Task]:
return [
task
for task in asyncio.Task.all_tasks()
if getattr(task, _ATTR_SHORT_TASK, False)
]
# =====
async def run_async(method: Callable[..., _RetvalT], *args: Any) -> _RetvalT:
return (await asyncio.get_running_loop().run_in_executor(None, method, *args))
def run_sync(coro: Coroutine[Any, Any, _RetvalT]) -> _RetvalT:
return asyncio.get_event_loop().run_until_complete(coro)
# =====
async def wait_infinite() -> None:
await asyncio.get_event_loop().create_future()
async def wait_first(*aws: Awaitable) -> Tuple[Set[asyncio.Future], Set[asyncio.Future]]:
return (await asyncio.wait(list(aws), return_when=asyncio.FIRST_COMPLETED))
# =====
async def afile_write_now(afile: aiofiles.base.AiofilesContextManager, data: bytes) -> None:
await afile.write(data)
await afile.flush()
await run_async(os.fsync, afile.fileno())
# =====
class AioNotifier:
def __init__(self) -> None:
self.__queue: asyncio.queues.Queue = asyncio.Queue()
async def notify(self) -> None:
await self.__queue.put(None)
async def wait(self) -> None:
await self.__queue.get()
while not self.__queue.empty():
await self.__queue.get()
# =====
class AioExclusiveRegion:
def __init__(
self,
exc_type: Type[Exception],
notifier: Optional[AioNotifier]=None,
) -> None:
self.__exc_type = exc_type
self.__notifier = notifier
self.__busy = False
def get_exc_type(self) -> Type[Exception]:
return self.__exc_type
def is_busy(self) -> bool:
return self.__busy
async def enter(self) -> None:
if not self.__busy:
self.__busy = True
try:
if self.__notifier:
await self.__notifier.notify()
except: # noqa: E722
self.__busy = False
raise
return
raise self.__exc_type()
async def exit(self) -> None:
self.__busy = False
if self.__notifier:
await self.__notifier.notify()
async def __aenter__(self) -> None:
await self.enter()
async def __aexit__(
self,
_exc_type: Type[BaseException],
_exc: BaseException,
_tb: types.TracebackType,
) -> None:
await self.exit()
async def run_region_task(
msg: str,
region: AioExclusiveRegion,
method: Callable[..., Coroutine[Any, Any, None]],
*args: Any,
**kwargs: Any,
) -> None:
entered = asyncio.Future() # type: ignore
async def wrapper() -> None:
try:
async with region:
entered.set_result(None)
await method(*args, **kwargs)
except region.get_exc_type():
raise
except Exception:
get_logger(0).exception(msg)
task = create_short_task(wrapper())
await asyncio.wait([entered, task], return_when=asyncio.FIRST_COMPLETED)
if entered.done():
return
if (exc := task.exception()) is not None:
raise exc
|
