🐛 fix(callback.py): replace ChatResponse with PromptResponse in AsyncStreamingLLMCallbackHandler to correctly handle prompt after formatting

🔀 chore(schemas.py): add PromptResponse schema to handle prompt responses in addition to ChatResponse schema

src/backend/langflow/api/v1/callback.py

@@ -3,7 +3,7 @@ from uuid import UUID
 
 from langchain.callbacks.base import AsyncCallbackHandler, BaseCallbackHandler
 
-from langflow.api.v1.schemas import ChatResponse
+from langflow.api.v1.schemas import ChatResponse, PromptResponse
 
 
 from typing import Any, Dict, List, Optional
@@ -92,10 +92,7 @@ class AsyncStreamingLLMCallbackHandler(AsyncCallbackHandler):
         if "Prompt after formatting" in text:
             text = text.replace("Prompt after formatting:\n", "")
             text = remove_ansi_escape_codes(text)
-            resp = ChatResponse(
-                message="",
-                type="stream",
-                intermediate_steps="",
+            resp = PromptResponse(
                 prompt=text,
             )
             await self.websocket.send_json(resp.dict())

src/backend/langflow/api/v1/schemas.py

@@ -86,7 +86,7 @@ class ChatResponse(ChatMessage):
     """Chat response schema."""
 
     intermediate_steps: str
-    prompt: Optional[str] = ""
+
     type: str
     is_bot: bool = True
     files: list = []
@@ -98,6 +98,14 @@ class ChatResponse(ChatMessage):
         return v
 
 
+class PromptResponse(ChatMessage):
+    """Prompt response schema."""
+
+    prompt: str
+    type: str = "prompt"
+    is_bot: bool = True
+
+
 class FileResponse(ChatMessage):
     """File response schema."""