Introduce intent for TFW messages and fix FSM related bugs

tfw/internals/event_handling/__init__.py

@@ -1,4 +1,5 @@
 from .event_handler import EventHandler
 from .event_handler_factory_base import EventHandlerFactoryBase
+from .control_event_handler import ControlEventHandler
 from .fsm_aware_event_handler import FSMAwareEventHandler
 from .signed_event_handler import SignedEventHandler

tfw/internals/event_handling/control_event_handler.py

@@ -0,0 +1,9 @@
+from tfw.internals.networking import Intent
+
+from .event_handler import EventHandler
+
+
+class ControlEventHandler(EventHandler): # pylint: disable=abstract-method
+    def _event_callback(self, message):
+        if message.get('intent') != Intent.EVENT.value:
+            self.handle_event(message, self.connector)

tfw/internals/event_handling/fsm_aware.py

@@ -7,6 +7,7 @@ LOG = logging.getLogger(__name__)
 
 class FSMAware:
     keys = ['fsm.update']
+
     def __init__(self):
         self.fsm_state = None
         self.fsm_in_accepted_state = False

tfw/internals/event_handling/signed_event_handler.py

@@ -2,13 +2,13 @@ import logging
 
 from tfw.internals.crypto import KeyManager, verify_message
 
-from .event_handler import EventHandler
+from .control_event_handler import ControlEventHandler
 
 LOG = logging.getLogger(__name__)
 
 
 # pylint: disable=abstract-method
-class SignedEventHandler(EventHandler):
+class SignedEventHandler(ControlEventHandler):
     def __init__(self, connector):
         self._auth_key = KeyManager().auth_key
         super().__init__(connector)