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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 contextlib
import types
import typing
from typing import List
from typing import Callable
from typing import Coroutine
from typing import AsyncGenerator
from typing import Type
from typing import TypeVar
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 muted(msg: str) -> Callable[[_MethodT], Callable[..., None]]:
def make_wrapper(method: _MethodT) -> Callable[..., None]:
@functools.wraps(method)
async def wrapper(*args: Any, **kwargs: Any) -> None:
try:
await method(*args, **kwargs)
except asyncio.CancelledError: # pylint: disable=try-except-raise
raise
except Exception:
get_logger(0).exception(msg)
return typing.cast(Callable[..., None], wrapper)
return make_wrapper
def tasked(method: Callable[..., Any]) -> Callable[..., asyncio.Task]:
@functools.wraps(method)
async def wrapper(*args: Any, **kwargs: Any) -> asyncio.Task:
return create_short_task(method(*args, **kwargs))
return typing.cast(Callable[..., asyncio.Task], 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()
# =====
@contextlib.asynccontextmanager
async def unlock_only_on_exception(lock: asyncio.Lock) -> AsyncGenerator[None, None]:
await lock.acquire()
try:
yield
except: # noqa: E722
lock.release()
raise
# =====
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 AioExclusiveRegion:
def __init__(self, exc_type: Type[Exception]) -> None:
self.__exc_type = exc_type
self.__busy = False
def is_busy(self) -> bool:
return self.__busy
async def enter(self) -> None:
if not self.__busy:
self.__busy = True
return
raise self.__exc_type()
async def exit(self) -> None:
self.__busy = False
@contextlib.asynccontextmanager
async def exit_only_on_exception(self) -> AsyncGenerator[None, None]:
await self.enter()
try:
yield
except: # noqa: E722
await self.exit()
raise
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()
# =====
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()
|
