Update app.py

app.py

@@ -597,7 +597,33 @@ with gr.Blocks(theme='sudeepshouche/minimalist', css=css) as demo:
         chat_history_engine = summarize_assistant_messages(chat_history_engine)
 
         # Engine:
-        exec(os.environ.get('engine'))
+        retriever_tools = [tool for choice, tool in choices_with_tools if choice in selected_choices]
+        
+        # Configuración dinámica de RouterRetriever y engine
+        retriever = RouterRetriever(
+            selector=PydanticMultiSelector.from_defaults(
+                llm=llm, prompt_template_str=DEFAULT_MULTI_PYD_SELECT_PROMPT_TMPL, max_outputs=3
+            ),
+            retriever_tools=retriever_tools,
+        )
+        custom_retriever = CustomRetriever(retriever, kg_retriever)
+        
+        query_engine = RetrieverQueryEngine.from_args(
+            retriever=custom_retriever,
+            response_synthesizer=response_synthesizer,
+            streaming=True
+        )
+        
+        memory = ChatMemoryBuffer.from_defaults(token_limit=20000)
+        
+        chat_engine = ContextChatEngine.from_defaults(
+            retriever=custom_retriever,
+            system_prompt=system_prompt,
+            memory=memory,
+            node_postprocessors=[],
+            context_template=context_prompt,
+            llm=gpt4omini
+        )
         
         # Generar la respuesta usando el motor de chat
         response = chat_engine.stream_chat(message, chat_history=chat_history_engine)