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golang-api-server

Build HTTP services, REST APIs, and middleware in Go. Use when building Go HTTP servers, REST APIs, or custom middleware.

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Files included (4)

  • SKILL.md2.6 KB
  • evals/evals.json1.8 KB
  • references/graceful-shutdown.md1.2 KB
  • references/middleware-patterns.md1.1 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Golang API Server

Priority: P0 (CRITICAL)

Router & GraphQL Selection

  • Standard Lib (net/http): Use for simple services or zero-dependency requirements. http.ServeMux (Go 1.22+) method-based routing.
  • Echo (labstack/echo) / Gin: Recommended for production REST APIs with middleware, binding, and error handling.
  • GraphQL (99designs/gqlgen): Standard for schema-first GraphQL services. Handlers/resolvers act as thin transport adapters.

Implementation Workflow

  1. Choose transport layer — REST (Echo/Gin/stdlib) or GraphQL (gqlgen).
  2. Thin Handlers & Resolvers — Handlers and resolvers parse/validate inputs, invoke use-case services, and map to transport models. Zero direct database queries or business rules.
  3. Transport-to-Domain Mapping — Domain models remain pure; transport models adapt to domain models via dedicated mappers.
  4. Response Nullability & Slice Defaulting — Default empty slices to [] (not null) unless the schema explicitly requires null. Avoid unnecessary nullable fields in GraphQL response schemas when zero-values suffice.
  5. Add middleware — Use middleware for cross-cutting concerns (Logging, Recovery, CORS, Auth, Tracing, RequestID).
  6. Enforce pagination limits — Support first/after (GraphQL cursor) or limit/offset (REST) with strict max caps to prevent memory exhaustion.
  7. Implement graceful shutdown — Handle SIGINT/SIGTERM to drain in-flight requests.

See graceful shutdown example and Echo handler patterns

Anti-Patterns

  • No business logic in handlers or resolvers: parse request, call service, and format response only.
  • No direct DB calls in resolvers: resolvers must call service interfaces, never execute SQL queries.
  • No nil slices in responses: return empty slice [] rather than null in API responses unless distinguishing null from empty.
  • No global router/schema vars: pass router/handler dependencies explicitly via constructor.
  • No missing shutdown: handle SIGTERM to drain in-flight requests.

References

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