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feat(langchain): add last trace id property to CallbackHandler #1230

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Merged
hassiebp merged 1 commit into from
Jun 27, 2025
Merged

feat(langchain): add last trace id property to CallbackHandler #1230

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6 changes: 6 additions & 0 deletions langfuse/langchain/CallbackHandler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,8 @@ def __init__(self, *, public_key: Optional[str] = None) -> None:
self.prompt_to_parent_run_map: Dict[UUID, Any] = {}
self.updated_completion_start_time_memo: Set[UUID] = set()

self.last_trace_id = None

def on_llm_new_token(
self,
token: str,
Expand Down Expand Up @@ -187,6 +189,8 @@ def on_chain_start(
level=span_level,
)

self.last_trace_id = self.runs[run_id].trace_id

except Exception as e:
langfuse_logger.exception(e)

Expand Down Expand Up @@ -573,6 +577,8 @@ def __on_llm_action(
else:
self.runs[run_id] = self.client.start_generation(**content)

self.last_trace_id = self.runs[run_id].trace_id

except Exception as e:
langfuse_logger.exception(e)

Expand Down
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