fix(openai-proxy): return None for empty trajectory in online mode

[fishcrap]

Description

Fix empty session handling in OpenAI proxy workflow's online mode. When a session has no interactions (user connected but never sent any chat/completions requests), the workflow now returns None with a warning instead of failing or producing incorrect stats.

Related Issue

Fixes #(issue)

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring (no functional changes)
• Performance improvement
• Test coverage improvement

Checklist

• I have read the Contributing Guide
• I have run formatting tools (pre-commit or manual)
• I have run relevant unit tests and they pass
• I have added tests for new functionality
• I have updated documentation if needed
• My branch is up to date with main
• This PR introduces breaking changes (if yes, fill out details below)
• If this PR changes documentation, I have built and previewed it locally with jb build docs
• No critical issues raised by AI reviewers (/gemini review)

Breaking Change Details (if applicable):

N/A

Additional Context

Empty sessions in online mode could cause index errors or record incorrect stats. Now they are gracefully handled with a warning log and rejected trajectory.

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the OpenAI proxy's online mode by introducing robust handling for sessions that conclude without any user interactions. The change ensures that such empty sessions are gracefully managed, preventing potential system failures or the generation of misleading statistical data, thus improving the overall stability and accuracy of the proxy's operation.

Highlights

• Empty Session Handling: Implemented explicit handling for sessions in the OpenAI proxy's online mode that have no user interactions, preventing errors and incorrect statistics.
• Graceful Exit: The workflow now returns None and logs a warning when an empty session is detected, indicating that the trajectory will be rejected.
• Refactored Stat Recording: Adjusted the logic for recording statistics to ensure it only proceeds when actual interactions are present in a session.

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Changelog

• areal/experimental/openai/proxy/workflow.py
  • Added a conditional check to detect sessions with no interactions.
  • Introduced a warning log message for empty sessions, indicating trajectory rejection.
  • Modified the function to return None immediately if no interactions are found.
  • Adjusted the stat recording logic to execute only when interactions are present, removing redundant checks.

Activity

• No specific activity (comments, reviews, etc.) has been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

This pull request correctly addresses an issue in the OpenAI proxy workflow's online mode where sessions with no interactions were not handled properly. The change introduces a check for empty interactions, logs a warning, and returns None to reject the trajectory, which aligns with the intended logic. This makes the workflow more robust. I have one minor suggestion to improve performance when retrieving the last interaction.