[BUG]: LangChain expects at least one chunk from a streaming trace after timeout #14688
Description
Tracer Version(s)
3.14.2
Python Version(s)
3.11.4
Pip Version(s)
pip 24.3.1
Bug Report
Using ddtrace-run command with LangChain and ChatOpenAI, after a timeout, the ddtrace integration fails.
packages/ddtrace/contrib/internal/langchain/patch.py", line 421, in _on_span_finished
joined_chunks = streamed_chunks[0]
~~~~~~~~~~~~~~~^^^
IndexError: list index out of range
Reproduction Code
ddtrace-run python my_script.py -> "Oops!"
python my_script.py -> "Success!"
from langchain_openai import ChatOpenAI
from openai import APITimeoutError
def run():
chain = ChatOpenAI(
api_key="my_key",
timeout=0.0001,
)
result = chain.stream("Hello, my name is")
try:
next(result)
except APITimeoutError as e:
print(f"Success! Caught expected timeout error: {e}")
except Exception as e:
print(f"Oops! Caught unexpected error: {e}")
if __name__ == "__main__":
run()Error Logs
No response
Libraries in Use
langchain==0.3.24
langchain-aws==0.2.10
langchain-community==0.3.22
langchain-core==0.3.55
langchain-openai==0.3.10
langchain-postgres==0.0.13
langchain-text-splitters==0.3.8
langdetect==1.0.9
langgraph==0.2.61
langgraph-checkpoint==2.0.9
langgraph-sdk==0.1.51
langsmith==0.2.10
openai==1.68.2
Operating System
No response