fix(topic_safety): handle InternalEvent objects in topic safety actions for Colang 2.0

[Pouyanpi]

Description

Fixes TypeError when using topic safety rails with Colang 2.0 configurations.

Problem

When running topic safety checks in Colang 2.0, the topic_safety_check_input action would fail with:

TypeError: 'InternalEvent' object is not subscriptable

This occurred because Colang 2.0 passes InternalEvent objects to the action, but the code was trying to pass them directly to to_chat_messages() which expects dictionary events.

Solution

• Convert InternalEvent objects to dictionary format before passing to to_chat_messages()
• Maintain backward compatibility with dictionary events
• Follows separation of concerns by keeping the conversion logic in the topic safety action

Testing

• Added regression test that fails without the fix and passes with it
• Verified fix works with content safety v2 example configuration

Related PR(s)

#1289

[Copilot]

Pull Request Overview

This PR fixes a TypeError that occurs when using topic safety rails with Colang 2.0 configurations. The issue arises because Colang 2.0 passes InternalEvent objects to the topic_safety_check_input action, but the existing code expected dictionary events.

• Added conversion logic to handle both InternalEvent objects and dictionary events
• Maintained backward compatibility with existing dictionary-based event handling
• Added comprehensive regression test to prevent future occurrences

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
nemoguardrails/library/topic_safety/actions.py	Added conversion logic to transform InternalEvent objects to dictionary format before passing to to_chat_messages()
tests/test_topic_safety_internalevent.py	Added regression test that verifies the fix handles InternalEvent objects without throwing TypeError

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 70.88%. Comparing base (949e422) to head (b42f739).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
nemoguardrails/library/topic_safety/actions.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1335      +/-   ##
===========================================
+ Coverage    70.70%   70.88%   +0.18%     
===========================================
  Files          161      161              
  Lines        16312    16319       +7     
===========================================
+ Hits         11533    11568      +35     
+ Misses        4779     4751      -28     

Flag	Coverage Δ
python	70.88% <87.50%> (+0.18%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
nemoguardrails/library/topic_safety/actions.py	88.88% <87.50%> (+61.22%)	⬆️

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