fix: improve end_traces so it doesn't block the build loop (#3482)

* refactor: Simplify log configuration logic in Graph class

* feat(tracing): Refactor _end_traces method to be async and use asyncio.to_thread.

This is an attempt to avoid blocking the build loop

src/backend/base/langflow/graph/graph/base.py

@@ -60,9 +60,8 @@ class Graph:
             edges (List[Dict[str, str]]): A list of dictionaries representing the edges of the graph.
             flow_id (Optional[str], optional): The ID of the flow. Defaults to None.
         """
-        if not log_config:
+        if log_config:
-            log_config = {"disable": False}
+            configure(**log_config)
-        configure(**log_config)
         self._start = start
         self._state_model = None
         self._end = end

src/backend/base/langflow/services/tracing/service.py

@@ -2,7 +2,7 @@ import asyncio
 import os
 from collections import defaultdict
 from contextlib import asynccontextmanager
-from typing import TYPE_CHECKING, Any, Dict, Optional, List
+from typing import TYPE_CHECKING, Any, Dict, List, Optional
 from uuid import UUID
 
 from loguru import logger
@@ -12,11 +12,12 @@ from langflow.services.tracing.base import BaseTracer
 from langflow.services.tracing.schema import Log
 
 if TYPE_CHECKING:
+    from langchain.callbacks.base import BaseCallbackHandler
+
     from langflow.custom.custom_component.component import Component
     from langflow.graph.vertex.base import Vertex
     from langflow.services.monitor.service import MonitorService
     from langflow.services.settings.service import SettingsService
-    from langchain.callbacks.base import BaseCallbackHandler
 
 
 def _get_langsmith_tracer():
@@ -210,8 +211,11 @@ class TracingService(Service):
             self._end_traces(trace_id, trace_name, e)
             raise e
         finally:
-            self._end_traces(trace_id, trace_name, None)
+            asyncio.create_task(asyncio.to_thread(self._end_and_reset, trace_id, trace_name, None))
-            self._reset_io()
+
+    async def _end_and_reset(self, trace_id: str, trace_name: str, error: Exception | None = None):
+        self._end_traces(trace_id, trace_name, error)
+        self._reset_io()
 
     def set_outputs(
         self,