refactoring

kvmd/aiotools.py

@@ -20,8 +20,9 @@
 # ========================================================================== #
 
 
-import asyncio
+import os
 import signal
+import asyncio
 import functools
 import types
 
@@ -42,8 +43,6 @@ from .logging import get_logger
 
 
 # =====
-_ATTR_SHORT_TASK = "_aiotools_short_task"
-
 _MethodT = TypeVar("_MethodT", bound=Callable[..., Any])
 _RetvalT = TypeVar("_RetvalT")
 
@@ -57,18 +56,56 @@ def atomic(method: _MethodT) -> _MethodT:
 
 
 # =====
+_ATTR_SHORT_TASK = "_aiotools_short_task"
+
+
 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 [
+async def wait_all_short_tasks() -> None:
+    await asyncio.gather(*[
         task
         for task in asyncio.all_tasks()
         if getattr(task, _ATTR_SHORT_TASK, False)
-    ]
+    ], return_exceptions=True)
+
+
+# =====
+_ATTR_DEADLY_TASK = "_aiotools_deadly_task"
+
+
+def create_deadly_task(name: str, coro: Coroutine) -> asyncio.Task:
+    logger = get_logger()
+
+    async def wrapper() -> None:
+        try:
+            await coro
+            raise RuntimeError(f"Deadly task is dead: {name}")
+        except asyncio.CancelledError:
+            pass
+        except Exception:
+            logger.exception("Unhandled exception in deadly task, killing myself ...")
+            pid = os.getpid()
+            if pid == 1:
+                os._exit(1)  # Docker workaround  # pylint: disable=protected-access
+            else:
+                os.kill(pid, signal.SIGTERM)
+
+    task = asyncio.create_task(wrapper())
+    setattr(task, _ATTR_DEADLY_TASK, True)
+    return task
+
+
+async def stop_all_deadly_tasks() -> None:
+    tasks: List[asyncio.Task] = []
+    for task in asyncio.all_tasks():
+        if getattr(task, _ATTR_DEADLY_TASK, False):
+            tasks.append(task)
+            task.cancel()
+    await asyncio.gather(*tasks, return_exceptions=True)
 
 
 # =====