Rukuzu: Porting a 200,000 Line C++ Graph Database to Rust with Systematic Testing
Porting Strategy for Large C++ Codebases to Rust
The Rukuzu project addresses a common systems software challenge: porting a mature 200,000-line C++ codebase (kuzu, an embedded graph database) to a pure Rust implementation. The motivation wasn't that the C++ code was problematic, but rather environmental constraints: mobile devices, edge deployments where C++ toolchains aren't available, FFI boundaries create debugging difficulties, and where a single statically-linked binary is valuable.
Systematic Porting Workflow
The team developed a workflow encoded as a Claude Code custom command that enables:
- Keeping the C++ version operational while building the Rust version
- Testing both implementations against each other
- Verifying at every step that the Rust port produces identical results to the original C++
Implementation Details
The workflow emerged from practical experience with:
- 15 ported crates
- 2,700+ tests
- Lessons about what translates mechanically versus what requires human judgment
The DEALER project (a fuzzy OWLv2 EL++ Description Logic reasoner) consumes both backends through a pluggable architecture, providing a production-grade testbed for correctness and performance comparison.
📖 Read the full source: r/ClaudeAI
👀 See Also
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