Add support for prefix state code

engine/pipeline.py

@@ -37,6 +37,7 @@ from .config import EngineConfig
 from .context_sync import AssistantContextSyncProcessor
 from .fastgpt_llm import FastGPTLLMService
 from .product_protocol import ProductWebsocketSerializer
+from .response_state import StateTagResponseProcessor
 from .services import create_llm_service, create_stt_service, create_tts_service
 from .text_input import ProductTextInputProcessor
 from .text_stream import ProductTextStreamProcessor, maybe_sync_assistant_context
@@ -153,21 +154,26 @@ async def run_pipeline_with_serializer(
         assistant_aggregator=assistant_aggregator,
     )
 
-    pipeline = Pipeline(
+    processors = [
+        transport.input(),
+        ProductTextInputProcessor(),
+        stt,
+        ProductTranscriptStreamProcessor(),
+        context_sync,
+        user_aggregator,
+        llm,
+    ]
+    if config.agent.response_state.enabled:
+        processors.append(StateTagResponseProcessor(config.agent.response_state))
+    processors.extend(
         [
-            transport.input(),
-            ProductTextInputProcessor(),
-            stt,
-            ProductTranscriptStreamProcessor(),
-            context_sync,
-            user_aggregator,
-            llm,
             text_stream,
             tts,
             transport.output(),
             assistant_aggregator,
         ]
     )
+    pipeline = Pipeline(processors)
 
     task = PipelineTask(
         pipeline,