Add a message length to each message.

[kixelated]

Useful for debugging encoding issues.

[claude]

Claude finished @kixelated's task —— View job

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PR Review Complete ✅

Add a message length to each message

Todo List:

• Read and analyze changes in draft-lcurley-moq-lite.md
• Review for code quality and best practices
• Check for potential bugs or issues
• Assess performance considerations
• Evaluate security concerns
• Consider test coverage implications
• Provide comprehensive review feedback

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Review Summary

This PR adds message length prefixes to all MOQ-Lite protocol messages, which is a solid improvement for protocol robustness and debugging capabilities.

✅ Strengths

Protocol Design Quality:

• Consistent implementation: The Message Length (i) field is systematically added to all 11 message types
• Clear specification: Well-documented in lines 255-261 with explicit guidance on length field semantics
• Proper error handling: Specifies that implementations SHOULD close with PROTOCOL_VIOLATION for unexpected lengths

Best Practices:

• Length excludes itself: Correctly specifies that the length field doesn't include its own varint bytes
• Version negotiation preference: Recommends using version/extensions rather than length for new fields
• Changelog maintenance: Properly documented in Appendix A

🔍 Technical Considerations

Performance Impact:

• Minimal overhead: Variable-length integers are efficient for small messages
• Parsing benefit: Enables implementations to pre-allocate buffers and validate message boundaries
• Network efficiency: No significant bandwidth impact given varint encoding

Security Enhancements:

• DoS protection: Message length validation helps prevent resource exhaustion attacks
• Parser robustness: Enables early detection of malformed messages before full parsing
• Protocol violation detection: Clear error semantics for implementation bugs

Implementation Considerations:

• Backward compatibility: This appears to be a breaking change requiring version bump
• Stream framing: Works well with QUIC's stream-based delivery model
• Debugging improvement: Aligns with PR description goal of helping debug encoding issues

📝 Minor Observations

Documentation:

• Line 272: "reciever" should be "receiver" (pre-existing typo)
• The specification format follows IETF RFC style consistently

Protocol Specification:

• All message formats are updated consistently
• Appendix B properly reflects the change from "Messages don't have an encoded length" to "Messages include a varint length prefix"

✅ Recommendation

APPROVE - This is a well-executed protocol enhancement that improves robustness, debugging capabilities, and implementation reliability with minimal overhead.

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[kixelated]

@claude can you fix any typos? And fix the appendix.

[claude]

Claude finished @kixelated's task —— View job

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Typos and Appendix Review Complete ✅

Todo List:

• Read the draft document to understand current state
• Fix typo: 'reciever' -> 'receiver' (line 272)
• Fix typo: 'cooresponds' -> 'corresponds' (line 86)
• Fix typo: 'idenfier' -> 'identifier' (line 408)
• Review appendix for accuracy
• Commit and push changes

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Summary

Typos Fixed:

• Line 86: cooresponds → corresponds
• Line 272: reciever → receiver
• Line 408: idenfier → identifier

Appendix Review:
The appendix is already accurate and properly reflects the message length changes:

• Appendix A correctly documents "Added Message Length (i) to all messages"
• Appendix B correctly lists "Messages include a varint length prefix" in the upstream differences

Changes committed and pushed to the message-size branch successfully.

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| Branch: message-size