better atomic ops

kvmd/aiotools.py

@@ -0,0 +1,48 @@
+# ========================================================================== #
+#                                                                            #
+#    KVMD - The main Pi-KVM daemon.                                          #
+#                                                                            #
+#    Copyright (C) 2018  Maxim Devaev <mdevaev@gmail.com>                    #
+#                                                                            #
+#    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 asyncio
+import functools
+
+import typing
+
+from typing import Callable
+from typing import TypeVar
+from typing import Any
+
+
+# =====
+_AtomicF = TypeVar("_AtomicF", bound=Callable[..., Any])
+
+
+def atomic(method: _AtomicF) -> _AtomicF:
+    @functools.wraps(method)
+    async def wrapper(*args: object, **kwargs: object) -> Any:
+        return (await asyncio.shield(method(*args, **kwargs)))
+    return typing.cast(_AtomicF, wrapper)
+
+
+def task(method: Callable[..., Any]) -> Callable[..., asyncio.Task]:
+    @functools.wraps(method)
+    async def wrapper(*args: object, **kwargs: object) -> asyncio.Task:
+        return asyncio.create_task(method(*args, **kwargs))
+    return typing.cast(Callable[..., asyncio.Task], wrapper)