Add fall back for Windows even loop fetching (#2421)

sanic/__version__.py

@@ -1 +1 @@
-__version__ = "22.3.0"
+__version__ = "22.3.1"

sanic/app.py

@@ -252,7 +252,13 @@ class Sanic(BaseSanic, RunnerMixin, metaclass=TouchUpMeta):
                 "Loop can only be retrieved after the app has started "
                 "running. Not supported with `create_server` function"
             )
-        return get_running_loop()
+        try:
+            return get_running_loop()
+        except RuntimeError:
+            if sys.version_info > (3, 10):
+                return asyncio.get_event_loop_policy().get_event_loop()
+            else:
+                return asyncio.get_event_loop()
 
     # -------------------------------------------------------------------- #
     # Registration

sanic/compat.py

@@ -72,7 +72,7 @@ def ctrlc_workaround_for_windows(app):
         """Asyncio wakeups to allow receiving SIGINT in Python"""
         while not die:
             # If someone else stopped the app, just exit
-            if app.is_stopping:
+            if app.state.is_stopping:
                 return
             # Windows Python blocks signal handlers while the event loop is
             # waiting for I/O. Frequent wakeups keep interrupts flowing.

tests/test_signal_handlers.py

@@ -3,6 +3,7 @@ import os
 import signal
 
 from queue import Queue
+from types import SimpleNamespace
 from unittest.mock import MagicMock
 
 import pytest
@@ -74,11 +75,12 @@ def test_windows_workaround():
     # Windows...
     class MockApp:
         def __init__(self):
-            self.is_stopping = False
+            self.state = SimpleNamespace()
+            self.state.is_stopping = False
 
         def stop(self):
-            assert not self.is_stopping
-            self.is_stopping = True
+            assert not self.state.is_stopping
+            self.state.is_stopping = True
 
         def add_task(self, func):
             loop = asyncio.get_event_loop()
@@ -91,11 +93,11 @@ def test_windows_workaround():
         if stop_first:
             app.stop()
             await asyncio.sleep(0.2)
-        assert app.is_stopping == stop_first
+        assert app.state.is_stopping == stop_first
         # First Ctrl+C: should call app.stop() within 0.1 seconds
         os.kill(os.getpid(), signal.SIGINT)
         await asyncio.sleep(0.2)
-        assert app.is_stopping
+        assert app.state.is_stopping
         assert app.stay_active_task.result() is None
         # Second Ctrl+C should raise
         with pytest.raises(KeyboardInterrupt):