added exception handling for (dbus://) SessionBus

apprise/plugins/NotifyDBus.py

@@ -54,6 +54,7 @@ try:
     from dbus import Interface
     from dbus import Byte
     from dbus import ByteArray
+    from dbus import DBusException
 
     #
     # now we try to determine which mainloop(s) we can access
@@ -249,8 +250,21 @@ class NotifyDBus(NotifyBase):
             return False
 
         # Acquire our session
+        try:
             session = SessionBus(mainloop=MAINLOOP_MAP[self.schema])
 
+        except DBusException:
+            # Handle exception
+            self.logger.warning('Failed to send DBus notification.')
+            self.logger.exception('DBus Exception')
+            return False
+
+        # If there is no title, but there is a body, swap the two to get rid
+        # of the weird whitespace
+        if not title:
+            title = body
+            body = ''
+
         # acquire our dbus object
         dbus_obj = session.get_object(
             NOTIFY_DBUS_INTERFACE,

test/test_glib_plugin.py

@@ -50,6 +50,8 @@ if 'dbus' not in sys.modules:
     # Environment doesn't allow for dbus
     pytest.skip("Skipping dbus-python based tests", allow_module_level=True)
 
+from dbus import DBusException  # noqa E402
+
 
 @mock.patch('dbus.SessionBus')
 @mock.patch('dbus.Interface')
@@ -344,6 +346,15 @@ def test_dbus_plugin(mock_mainloop, mock_byte, mock_bytearray,
     # Verify this all works in the event a ValueError is also thronw
     # out of the call to gi.require_version()
 
+    mock_sessionbus.side_effect = DBusException('test')
+    # Handle Dbus Session Initialization error
+    assert obj.notify(
+        title='title', body='body',
+        notify_type=apprise.NotifyType.INFO) is False
+
+    # Return side effect to normal
+    mock_sessionbus.side_effect = None
+
     # Emulate require_version function:
     gi.require_version.side_effect = ValueError()