Update FSM related classes according to the new API

tfw/components/fsm/fsm_handler.py

@@ -1,6 +1,6 @@
 import logging
 
-from tfw.internals.crypto import KeyManager, sign_message, verify_message
+from tfw.internals.crypto import KeyManager, sign_message
 from tfw.internals.networking import Scope
 
 from .fsm_updater import FSMUpdater
@@ -9,57 +9,30 @@ LOG = logging.getLogger(__name__)
 
 
 class FSMHandler:
-    keys = ['fsm']
-    """
-    EventHandler responsible for managing the state machine of
-    the framework (TFW FSM).
-
-    tfw.networking.TFWServer instances automatically send 'trigger'
-    commands to the event handler listening on the 'fsm' key,
-    which should be an instance of this event handler.
-
-    This event handler accepts messages that have a
-    data['command'] key specifying a command to be executed.
-
-    An 'fsm_update' message is broadcasted after every successful
-    command.
-    """
+    keys = ['fsm.step', 'fsm.update']
     def __init__(self, *, fsm_type):
         self.fsm = fsm_type()
         self._fsm_updater = FSMUpdater(self.fsm)
         self.auth_key = KeyManager().auth_key
 
         self.command_handlers = {
-            'trigger': self.handle_trigger,
-            'update':  self.handle_update
+            'fsm.step'   : self.handle_step,
+            'fsm.update' : self.handle_update
         }
 
     def handle_event(self, message, connector):
         try:
-            message = self.command_handlers[message['data']['command']](message)
+            message = self.command_handlers[message['key']](message)
             if message:
                 fsm_update_message = self._fsm_updater.fsm_update
-                sign_message(self.auth_key, message)
                 sign_message(self.auth_key, fsm_update_message)
                 connector.send_message(fsm_update_message, Scope.BROADCAST)
         except KeyError:
             LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
 
-    def handle_trigger(self, message):
-        """
-        Attempts to step the FSM with the supplied trigger.
-
-        :param message: TFW message with a data field containing
-                        the action to try triggering in data['value']
-        """
-        trigger = message['data']['value']
-        if self.fsm.step(trigger):
-            return message
-        return None
+    def handle_step(self, message):
+        return message if self.fsm.step(message['trigger']) else None
 
     def handle_update(self, message):
-        """
-        Does nothing, but triggers an 'fsm_update' message.
-        """
         # pylint: disable=no-self-use
         return message

tfw/components/fsm/fsm_updater.py

@@ -5,7 +5,7 @@ class FSMUpdater:
     @property
     def fsm_update(self):
         return {
-            'key': 'fsm_update',
+            'key': 'fsm.announce',
             **self.fsm_update_data
         }