[feature][memory] add global_msg and modified function

Author: yunjiu

muagent/connector/memory_manager.py

@@ -857,4 +857,46 @@ def tbasedoc2Memory(self, r_docs) -> Memory:
         #         content = message.customed_kargs.pop(key)
         #         if content is not None:
         #             message.setattr(key, content)
-        return memory
+        return memory
+    
+
+    def init_global_msg(self, chat_index: str, role_name: str, role_content: str, role_type: str = "global_value") -> bool:
+        msg = Message(chat_index=chat_index, role_name=role_name, role_type=role_type, role_content=role_content)
+        try:
+            self.append(msg)
+            return True  
+        except Exception as e:
+            logger.error(f"Failed to initialize global message: {e}")
+            return False
+    
+    def get_msg_by_role_name(self, chat_index: str, role_name: str) -> Optional[Message]:
+        memory = self.get_memory_pool(chat_index)
+        for msg in memory.messages:
+            if msg.role_name == role_name:
+                return msg
+        return None
+    
+    def get_msg_content_by_role_name(self, chat_index: str, role_name: str) -> Optional[str]:
+        message = self.get_msg_by_role_name(chat_index, role_name)
+        if message == None:
+            return None
+        else:
+            return message.role_content
+        
+    def update_msg_content_by_rule(self, chat_index: str, role_name: str, new_content: str,update_rule: str) -> bool:
+        message = self.get_msg_by_role_name(chat_index, role_name)
+        
+        if message == None:
+            return False 
+
+        prompt = f"{new_content}{message.role_content}{update_rule}"
+
+        model = getChatModelFromConfig(self.llm_config)
+
+        new_role_content = model.predict(prompt)
+
+        if new_role_content is not None:
+            message.role_content = new_role_content  
+            return True
+        else:
+            return False