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fix(langchain): capture usage on streamed gemini responses #1309

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Merged
hassiebp merged 3 commits into from
Aug 26, 2025
Merged

fix(langchain): capture usage on streamed gemini responses #1309

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cd45de3
fix(langchain): capture usage on streamed gemini responses
hassiebp Aug 22, 2025
15ff192
push
hassiebp Aug 26, 2025
6f8b601
Merge branch 'main' into fix-langchain-gemini-streaming-usage
hassiebp Aug 26, 2025
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4 changes: 3 additions & 1 deletion langfuse/langchain/CallbackHandler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1140,7 +1140,9 @@ def _parse_usage(response: LLMResult) -> Any:
llm_usage = _parse_usage_model(
generation_chunk.generation_info["usage_metadata"]
)
break

if llm_usage is not None:
break

message_chunk = getattr(generation_chunk, "message", {})
response_metadata = getattr(message_chunk, "response_metadata", {})
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1 change: 1 addition & 0 deletions tests/test_langchain.py
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Expand Up @@ -177,6 +177,7 @@ def test_callback_generated_from_lcel_chain():
assert langchain_generation_span.output != ""


@pytest.mark.skip(reason="Flaky")
def test_basic_chat_openai():
# Create a unique name for this test
test_name = f"Test Basic Chat {create_uuid()}"
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