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fix(langgraph): ignore control flow exceptions in LangChain callback (#1169) #1180

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Merged
hassiebp merged 1 commit into from
May 6, 2025
Merged

fix(langgraph): ignore control flow exceptions in LangChain callback (#1169) #1180

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15 changes: 13 additions & 2 deletions langfuse/callback/langchain.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@
log.error(
f"Could not import langchain. The langchain integration will not work. {e}"
)
from typing import Any, Dict, List, Optional, Sequence, Union, cast
from typing import Any, Dict, List, Optional, Sequence, Set, Type, Union, cast
from uuid import UUID, uuid4

from langfuse.api.resources.ingestion.types.sdk_log_body import SdkLogBody
Expand Down Expand Up @@ -52,7 +52,13 @@
)

LANGSMITH_TAG_HIDDEN: str = "langsmith:hidden"
CONTROL_FLOW_EXCEPTION_TYPES: Set[Type[BaseException]] = set()

try:
from langgraph.errors import GraphBubbleUp
CONTROL_FLOW_EXCEPTION_TYPES.add(GraphBubbleUp)
except ImportError:
pass

class LangchainCallbackHandler(
LangchainBaseCallbackHandler, LangfuseBaseCallbackHandler
Expand Down Expand Up @@ -484,8 +490,13 @@ def on_chain_error(
try:
self._log_debug_event("on_chain_error", run_id, parent_run_id, error=error)
if run_id in self.runs:
if any(isinstance(error, t) for t in CONTROL_FLOW_EXCEPTION_TYPES):
level = None
else:
level = "ERROR"

self.runs[run_id] = self.runs[run_id].end(
level="ERROR",
level=level,
status_message=str(error),
version=self.version,
input=kwargs.get("inputs"),
Expand Down
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