llm-multiverse/implementation-plans/issue-038.md

Implementation Plan — Issue #38: Scaffold Model Gateway Rust project

Metadata

Field	Value
Issue	#38
Title	Scaffold Model Gateway Rust project
Milestone	Phase 5: Model Gateway
Labels
Status	COMPLETED
Language	Rust
Related Plans	issue-018.md, issue-022.md, issue-027.md
Blocked by	#16 (completed)

Acceptance Criteria

• Cargo workspace member created (services/model-gateway/)
• Dependency on proto-gen crate
• Tonic gRPC server boilerplate compiles
• Configuration loading (address, port, Ollama URL, model routing config)
• Health check endpoint responds

Implementation Steps

1. Add workspace member to root Cargo.toml
2. Create services/model-gateway/Cargo.toml with proto-gen dependency
3. Create src/lib.rs with module exports
4. Create src/config.rs with Config + ModelRoutingConfig (TOML loading, serde defaults)
5. Create src/service.rs with ModelGatewayService trait impl (IsModelReady + stubs)
6. Create src/main.rs with tonic server entry point
7. Unit tests for config

Files to Create/Modify

File	Action	Purpose
Cargo.toml	Modify	Add workspace member
services/model-gateway/Cargo.toml	Create	Crate manifest
services/model-gateway/src/lib.rs	Create	Module exports
services/model-gateway/src/main.rs	Create	Server entry point
services/model-gateway/src/config.rs	Create	Configuration with TOML loading
services/model-gateway/src/service.rs	Create	gRPC service impl

Deviation Log

Deviation	Reason