Make a bunch of tweaks to try to fix memory errors blocking shutdown

Tweaked the order of some resources getting destroyed, did a bit more manual cleanup of WX resources in `WxApp`.

Also shortened the loop sleep time in SnapshotService so that it can react quicker to kill signals.

src/gui/systray.py

@@ -39,9 +39,9 @@ def CreatePopupMenu(self):
         return menu
 
     def exit(self):
+        self.RemoveIcon()
         if callable(self._on_exit):
             self._on_exit()
-        self.RemoveIcon()
 
     def __enter__(self):
         return self

src/gui/wx_app.py

@@ -20,6 +20,7 @@ class WxApp(wx.App):
     def __init__(self):
         self._log = logging.getLogger(__name__).getChild(self.__class__.__name__ + '.' + str(id(self)))
         super().__init__()
+        self.SetExitOnFrameDelete(False)
 
     def __new__(cls, *args, **kwargs):
         if not isinstance(getattr(cls, '_WxApp__instance', None), cls):
@@ -50,13 +51,27 @@ def check_parent_alive():
             if not parent or parent.is_running():
                 return
             self._log.info('parent process no longer running. exiting mainloop...')
+            if self.timer.IsRunning():
+                self.timer.Stop()
             self.ExitMainLoop()
 
         # enable sigterm by regularly returning control back to python
         self.timer = wx.Timer(self._top_frame)
         self._top_frame.Bind(wx.EVT_TIMER, lambda *_: check_parent_alive(), self.timer)
         self.timer.Start(1000)
 
+    def Destroy(self):
+        if self.timer.IsRunning():
+            self.timer.Stop()
+            self.timer.Destroy()
+        if self._top_frame:
+            self._top_frame.Destroy()
+        if top := self.GetTopWindow():
+            top.Destroy()
+        if top := self.GetMainTopWindow():
+            top.Destroy()
+        return super().Destroy()
+
 
 def spawn_gui(snapshot: SnapshotFile, start_page: Literal['rules', 'settings'] = 'rules'):
     top = WxApp()._top_frame

src/main.py

@@ -8,7 +8,7 @@
 import psutil
 import win32con
 import win32gui
-
+import wx
 from common import Window, XandY, load_json, local_path, match, single_call
 from device import DeviceChangeCallback, DeviceChangeService
 from gui import TaskbarIcon, WxApp, about_dialog, radio_menu
@@ -190,14 +190,16 @@ def find_matching_profile(window: Window) -> Optional[dict]:
 @single_call
 def shutdown(*_):
     log.info('begin shutdown process')
-    app.ExitMainLoop()
     monitor_thread.stop()
     snapshot_service.stop()
-    log.debug('destroy WxApp')
-    app.Destroy()
+    window_spawn_thread.stop()
     log.info('save snapshot before shutting down')
     snap.save()
+    log.debug('destroy WxApp')
+    app.ExitMainLoop()
+    app.Destroy()
     log.info('end shutdown process')
+    wx.Exit()
 
 
 if __name__ == '__main__':
@@ -288,3 +290,4 @@ def shutdown(*_):
             log.info('app mainloop closed')
             shutdown()
     log.debug('fin')
+    wx.Exit()

src/snapshot.py

@@ -188,6 +188,6 @@ def _runner(self, snapshot: SnapshotFile):
 
             sleep_start = time.time()
             while time.time() - sleep_start < settings.get('snapshot_freq', 30):
-                time.sleep(1)
+                time.sleep(0.5)
                 if self._kill_signal.is_set():
                     return