fix(langchain): Add "dont_throw" to "on_llm_end" and remove blank file

[LuizDMM]

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Description

I left an empty file (I think it was left during some merges and moving code around) on my last PR about langchain and also forget to add back a @dont_throw I think I removed while testing, as pointed out by @ronensc (thank you man 😁), fixing those problems.

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Important

Add @dont_throw to on_llm_end in callback_handler.py and remove empty event_handler.py.

• Behavior:
  • Add @dont_throw decorator to on_llm_end in callback_handler.py to handle exceptions gracefully.
• Misc:
  • Remove empty event_handler.py file.

^{This description was created by for 8313eb6. You can customize this summary. It will automatically update as commits are pushed.}

Summary by CodeRabbit

• Bug Fixes
  • Improved error handling in callback processing to prevent unexpected interruptions during model response completion, increasing overall stability.

[coderabbitai]

Walkthrough

The @dont_throw decorator was added to the on_llm_end method of the TraceloopCallbackHandler class in the callback handler module. No other modifications to method logic, parameters, or control flow were made.

Changes

Cohort / File(s)	Change Summary
Decorator Addition to Callback Method packages/opentelemetry-instrumentation-langchain/opentelemetry/instrumentation/langchain/callback_handler.py	Added @dont_throw decorator to on_llm_end method in TraceloopCallbackHandler class.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A decorator hops in, soft and spry,
Quieting errors that flutter by.
on_llm_end now gentle and light,
Silent fixes through day and night.
🐇✨

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Reviewing files that changed from the base of the PR and between 8313eb6 and 15498d4.

📒 Files selected for processing (1)

• packages/opentelemetry-instrumentation-langchain/opentelemetry/instrumentation/langchain/callback_handler.py (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• packages/opentelemetry-instrumentation-langchain/opentelemetry/instrumentation/langchain/callback_handler.py

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[ellipsis-dev]

Important

Looks good to me! 👍

Reviewed everything up to 8313eb6 in 47 seconds. Click for details.

• Reviewed 15 lines of code in 2 files
• Skipped 0 files when reviewing.
• Skipped posting 2 draft comments. View those below.
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1. packages/opentelemetry-instrumentation-langchain/opentelemetry/instrumentation/langchain/callback_handler.py:477

• Draft comment:
  Good fix: adding @dont_throw here ensures on_llm_end handles errors consistently like other callbacks.
• Reason this comment was not posted:
  Comment did not seem useful. Confidence is useful = 0% <= threshold 50% This comment is purely informative, as it praises the fix and explains what the change does without suggesting any improvements or asking for clarifications. It doesn't align with the rules for useful comments.

2. packages/opentelemetry-instrumentation-langchain/opentelemetry/instrumentation/langchain/event_handler.py:1

• Draft comment:
  Removal of the empty event_handler.py file is appropriate.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

Workflow ID: wflow_upao0cAzbh98A8w4

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