optimize:handle history button (#384)

Author: zhongxiao-myshell

servers/automata.py

@@ -499,13 +499,26 @@ def prepare_payload(automata: Automata, event_data: MyShellUserInput, sess_state
             event_name = None
 
     print("event_name:", event_name)
+
+    def check_history_event(e):
+        if isinstance(event_name, str) and sess_state.event_mapping.get(e) is not None:
+            return False
+        tmp = e.split('_')
+        if len(tmp.split('_')) == 4 and tmp[0] == "MESSAGE" and tmp[2] == "BUTTON":
+            return True
+        return False
+
     if event_name is None:
         target_state = automata.initial
     elif isinstance(event_name, str) and len(event_name.split(':')) == 4 and sess_state.event_mapping.get(
             event_name) is None:
         # key 满足xxx:xxx:xxx:xxx格式且event_name不存在，则报错Invalid Event
         error_message = f"Get event_name from event_mapping failed, KeyError: {event_name}"
         raise ShellException("UNKNOWN-9999", "Invalid Event", error_message)
+    elif isinstance(event_name, str) and check_history_event(event_name):
+        # key 满足MESSAGE_xx_BUTTON_xx格式且event_name不存在，则报错Historical Event
+        error_message = f"Get event_name from event_mapping failed, KeyError: {event_name}"
+        raise ShellException("UNKNOWN-9999", "Historical Event", error_message)
     else:
         target_state = sess_state.event_mapping[event_name].target_state
     payload = {}