async_helpers: add way to associate a coroutine to an urwid signal

Signed-off-by: Olivier Gayot <[email protected]>

subiquitycore/async_helpers.py

@@ -15,6 +15,9 @@
 import asyncio
 import concurrent.futures
 import logging
+from functools import partial
+
+from urwid import connect_signal
 
 log = logging.getLogger("subiquitycore.async_helpers")
 
@@ -45,6 +48,14 @@ def schedule_task(coro, propagate_errors=True):
 background_tasks = set()
 
 
+def connect_async_signal(obj, name, callback, **kwargs):
+    connect_signal(obj, name, partial(async_signal_callback, callback), **kwargs)
+
+
+def async_signal_callback(callback, *args, **kwargs):
+    run_bg_task(callback(*args, **kwargs))
+
+
 def run_bg_task(coro, **kwargs) -> None:
     """Run a background task in a fire-and-forget style."""
     task = asyncio.create_task(coro, **kwargs)