From a23121aa5478be7a2c02a676697423fc3ce58701 Mon Sep 17 00:00:00 2001
From: Gabriel Luiz Freitas Almeida <gabriel@logspace.ai>
Date: Thu, 15 Jun 2023 07:44:11 -0300
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20fix(chat.py):=20yield=20error=20?=
 =?UTF-8?q?message=20when=20an=20exception=20occurs=20during=20stream=5Fbu?=
 =?UTF-8?q?ild=20=F0=9F=94=A7=20chore(base.py):=20fix=20typo=20in=20docstr?=
 =?UTF-8?q?ing=20The=20fix=20in=20chat.py=20ensures=20that=20an=20error=20?=
 =?UTF-8?q?message=20is=20yielded=20when=20an=20exception=20occurs=20durin?=
 =?UTF-8?q?g=20stream=5Fbuild.=20This=20helps=20to=20provide=20more=20info?=
 =?UTF-8?q?rmation=20to=20the=20client-side=20when=20an=20error=20occurs.?=
 =?UTF-8?q?=20The=20typo=20in=20base.py's=20docstring=20is=20fixed=20to=20?=
 =?UTF-8?q?improve=20readability.?=
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---
 src/backend/langflow/api/v1/chat.py      | 5 +++--
 src/backend/langflow/graph/graph/base.py | 3 ++-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/backend/langflow/api/v1/chat.py b/src/backend/langflow/api/v1/chat.py
index 7acdf32ce..18f547682 100644
--- a/src/backend/langflow/api/v1/chat.py
+++ b/src/backend/langflow/api/v1/chat.py
@@ -107,8 +107,9 @@ async def stream_build(flow_id: str):
                 yield f"data: {response}\n\n"
 
             chat_manager.set_cache(flow_id, graph.build())
-        except Exception:
-            logger.error("Error while building the flow")
+        except Exception as exc:
+            logger.error("Error while building the flow: %s", exc)
+            yield f"data: {json.dumps({'error': str(exc)})}\n\n"
         finally:
             yield f"data: {final_response}\n\n"
 
diff --git a/src/backend/langflow/graph/graph/base.py b/src/backend/langflow/graph/graph/base.py
index ae4b37e2c..5cefdadae 100644
--- a/src/backend/langflow/graph/graph/base.py
+++ b/src/backend/langflow/graph/graph/base.py
@@ -10,6 +10,7 @@ from langflow.graph.vertex.types import (
 )
 from langflow.interface.tools.constants import FILE_TOOLS
 from langflow.utils import payload
+from langflow.utils.logger import logger
 
 
 class Graph:
@@ -30,7 +31,7 @@ class Graph:
         Creates a graph from a payload.
 
         Args:
-            payload (Dict): The payload to create the graph from.
+            payload (Dict): The payload to create the graph from.˜`
 
         Returns:
             Graph: The created graph.