Use rate-limiter-flexible for rate-limiting

[tudddorrr]

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[claude]

Code Review: Rate Limiter Migration to rate-limiter-flexible

Overview

This PR successfully migrates from a custom Redis-based rate limiting implementation to the well-established rate-limiter-flexible library. The change is well-structured and addresses several limitations of the previous approach.

✅ Positive Changes

Code Quality & Best Practices:

• Improved maintainability: Replaces custom Redis scripting with a battle-tested library
• Better error handling: The library provides structured error objects with remainingPoints property
• Cleaner architecture: Removes complex cache management and interval cleanup logic
• Consistent API: The function signature remains backward-compatible

Performance Considerations:

• Memory efficiency: Eliminates the in-memory cache that required periodic cleanup
• Redis optimization: Uses the library's optimized Redis operations instead of custom Lua scripts
• Connection reuse: Rate limiter instances are cached and reused via the rateLimiters Map

Security Improvements:

• Professional implementation: Uses a library maintained by security experts
• Better key management: Consistent key prefixing with rl_${maxRequests}_${duration}

🔍 Potential Issues & Suggestions

1. Breaking API Change
The function now accepts a duration parameter (defaults to 60s), but existing callers don't pass it:

• src/socket/socketConnection.ts:60 - calls without duration parameter
• src/middleware/limiter-middleware.ts:35 - calls without duration parameter

Recommendation: Consider adding migration notes or ensuring all callers are updated to be explicit about duration.

2. Error Handling Edge Case
The error checking assumes only rate limit errors have remainingPoints. Consider type checking the error more strictly.

3. Memory Considerations
The rateLimiters Map grows indefinitely. In production with many different rate limit configurations, this could accumulate unused limiters.

Recommendation: Consider implementing cleanup for unused limiters or document the expected number of unique configurations.

🧪 Test Coverage

Excellent test migration:

• Proper mocking strategy using vi.spyOn
• Tests are more reliable without depending on Redis timing
• Maintains test behavior while using the new implementation

Minor suggestion: Consider adding a test that verifies the duration parameter is properly used.

🚀 Performance Impact

Positive changes:

• Eliminates JavaScript-based cache cleanup intervals
• Uses library-optimized Redis operations
• Better memory usage patterns

🔒 Security Assessment

No security concerns identified:

• Library is well-maintained and widely used
• Key prefixing prevents conflicts
• No credential or sensitive data exposure

📝 Documentation

The code is self-documenting, but consider:

• Adding a comment about the rateLimiters Map lifecycle
• Documenting the default 60-second duration choice

🎯 Overall Assessment

This is a high-quality refactor that modernizes the rate limiting implementation. The migration is well-executed with proper testing and maintains backward compatibility.

Recommendation: ✅ Approve with minor suggestions addressed

Great work on improving the codebase architecture! 🚀

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (develop@cde88ef). Learn more about missing BASE report.
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

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  Branches           ?     1303           
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  Hits               ?    14382           
  Misses             ?      115           
  Partials           ?        3           

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