API Gateway

Reverse proxy gateway with rate limiting (token bucket + Redis), circuit breakers, retry with exponential backoff, API key auth, and Prometheus metrics. Written in Go.

Running

cp .env.example .env
make run            # or: make docker-up

Requires Redis 7+ for rate limiting and API key storage.

Key Config

Variable	Default	Notes
PORT	8081	Gateway port
RATE_LIMIT_RPM	60	Requests/minute per client
CB_MAX_FAILURES	5	Failures before circuit opens
CB_RESET_TIMEOUT_SECONDS	30	Open → half-open delay
RETRY_MAX_RETRIES	3	Max retry attempts
ADMIN_AUTH_ENABLED	true	Basic auth on /admin/*

See .env.example for the full list.

Endpoints

Management: /health, /info, /metrics, /services/health

Admin (Basic Auth): /admin/apikeys (CRUD), /admin/circuit-breakers (stats + reset)

Proxy: everything else routes to backends by path prefix (/api/auth/* → auth-service, /api/users/* → user-service).

Testing

go test ./...

License

MIT