feat(bin): Rollup Binary

[refcell]

Introduces a new binary in Kona to support higher level rollup operations including execution extension support.

[Copilot]

Pull Request Overview

This PR introduces a new rollup binary to the Kona project, adding support for higher-level rollup operations and execution extension capabilities.

• Adds a new bin/rollup workspace member to the Cargo.toml configuration

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[claude]

Claude finished @refcell's task —— View job

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PR Review: Rollup Binary Implementation

Todo List:

• Read project guidelines from CLAUDE.md
• Examine all changed files
• Compare with existing binary patterns
• Assess code quality and standards compliance
• Check for security concerns
• Evaluate performance considerations
• Review test coverage
• Provide comprehensive feedback

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Code Quality Assessment

✅ Positive Aspects

1. Proper Workspace Integration

   • Correctly added to both members and default-members in Cargo.toml:30
   • Uses workspace inheritance for standard package metadata
   • Follows established binary naming pattern

2. Documentation Standards

   • Includes proper rustdoc attributes (main.rs:3-7)
   • Has issue tracker base URL configured
   • Enables documentation features appropriately

3. Code Style Compliance

   • Uses proper lint configurations (main.rs:5-7)
   • Follows Rust naming conventions
   • Matches existing binary structure in bin/ directory

⚠️ Issues & Recommendations

Critical Issues

1. Inconsistent Package Naming (bin/rollup/Cargo.toml:2)

   name = "rollup"  # ❌ Inconsistent with other binaries

   Issue: Other binaries use kona- prefix (e.g., kona-client, kona-node)
   Recommendation: Change to name = "kona-rollup" for consistency

2. Missing Version Strategy (bin/rollup/Cargo.toml:3)

   version = "0.0.0"  # ❌ Placeholder version

   Issue: While 0.0.0 is acceptable for initial development, consider alignment with other binaries
   Recommendation: Review if this should match other binary versions or use semantic versioning

Quality Improvements

3. Empty Dependencies Section (bin/rollup/Cargo.toml:17)

   [dependencies]
   # Empty - will need core dependencies

   Issue: No dependencies defined for a "higher-level rollup operations" binary
   Recommendation: Based on the PR description, likely needs:

   • Core protocol crates (kona-protocol, kona-derive)
   • CLI framework (clap)
   • Async runtime (tokio)
   • Error handling (anyhow, thiserror)

4. Minimal Implementation (bin/rollup/src/main.rs:10-12)

   fn main() {
       // TODO: Implementation coming soon
   }

   Issue: No indication of intended architecture or interfaces
   Recommendation: Add basic CLI structure or at least doc comments outlining planned functionality

5. Generic README (bin/rollup/README.md)

   # rollup
   Coming soon.

   Issue: No description of purpose, usage, or relationship to existing binaries
   Recommendation: Add proper documentation explaining:

   • Purpose and relationship to existing bin/node
   • Planned "execution extension support"
   • Basic usage examples

🔒 Security Assessment

✅ No Security Concerns: The current implementation is minimal and poses no security risks. However, future development should consider:

• Input validation for CLI arguments
• Secure handling of private keys/credentials
• Network communication security

⚡ Performance Considerations

✅ No Performance Issues: Current skeleton implementation has no performance implications. Future considerations:

• Choose appropriate async runtime configuration
• Consider memory usage for large-scale operations
• Plan for efficient data structures based on "execution extension support" requirements

🧪 Test Coverage

❌ No Tests: No test files present, which is expected for a skeleton implementation
Recommendation: Plan test structure early:

• Unit tests for core functionality
• Integration tests for CLI interface
• Consider following patterns from bin/client and bin/node

📋 Missing Configuration

Compared to other binaries, consider adding:

• build.rs if build-time configuration needed
• Feature flags for optional functionality
• publish = false if not intended for crate publication

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Summary

This is a well-structured skeleton implementation that properly follows Kona's workspace patterns and coding standards. The main issues are:

1. Package naming consistency - should use kona-rollup
2. Empty dependencies - needs core dependencies for planned functionality
3. Documentation gaps - README and code comments should explain purpose

The implementation follows security and performance best practices for a minimal binary. Once the core functionality is added, proper testing and documentation will be essential.

Recommendation: ✅ Approve with minor changes - Address naming consistency and add basic documentation before merging.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.1%. Comparing base (f11731a) to head (0e11612).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
bin/rollup/src/main.rs	0.0%	2 Missing ⚠️

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