Backend Skill: Service Layer Patterns

What problem does it solve?

This Skill codifies a robust backend service layer that cleanly separates HTTP handling, business logic, and data access, enabling easier testing, maintenance, and evolution of complex Go services.

Core Features & Use Cases

• Constructor Injection: Dependencies are injected via constructors, avoiding globals and enabling easy testing.
• Interface-Driven Testing: Public interfaces facilitate mock implementations in tests.
• Multi-Repository Orchestration: Coordinates multiple repositories and external services to implement business workflows.
• Caching & Resilience: Integrates with Redis for caching and implements graceful degradation for external API failures (ESI).

Quick Start

Create a Go backend service by defining interfaces, implementing the service layer, and wiring dependencies with constructors. Example: initialize a service with an ESI client, a Redis client, and a logger, then call service methods with a context. Run go test ./... to validate behavior.