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

[hassiebp]

Important

LangchainCallbackHandler now ignores GraphBubbleUp exceptions in on_chain_error, preventing them from being logged as errors.

• Behavior:
  • on_chain_error in LangchainCallbackHandler now ignores exceptions of type GraphBubbleUp from langgraph.errors, not logging them as errors.
  • Introduces CONTROL_FLOW_EXCEPTION_TYPES set to store exception types to be ignored.
• Imports:
  • Adds Set and Type to imports in langchain.py.
  • Attempts to import GraphBubbleUp from langgraph.errors and adds it to CONTROL_FLOW_EXCEPTION_TYPES if available.

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Greptile Summary

Disclaimer: Experimental PR review

Enhanced LangChain callback handler to properly handle control flow exceptions from LangGraph, preventing GraphBubbleUp exceptions from being logged as errors in Langfuse.

• Added CONTROL_FLOW_EXCEPTION_TYPES set in langfuse/callback/langchain.py to track special exception types
• Added support for LangGraph's GraphBubbleUp exception in control flow handling
• Modified error handling logic to avoid marking control flow exceptions as errors
• Improved integration between LangGraph and Langfuse by allowing expected control flow exceptions

[greptile-apps]

LGTM

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