BE-16: Implement Redis-backed API rate limiting to prevent DoS attacks - #929
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chinweobtagaz merged 1 commit intoJul 30, 2026
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Add a RedisRateLimiter middleware for actix-web that tracks request counts per client IP using Redis INCR + EXPIRE, ensuring state is shared across all server workers. - Added rate_limiter.rs: generic Redis-backed middleware with configurable per-window limits and sliding window via INCR/EXPIRE - Applied 5 req/min limit to /v1/auth (login, register, refresh, logout) - Applied 30 req/min limit to /v1/games - Added env config: REDIS_AUTH_RATE_LIMIT, REDIS_AUTH_RATE_LIMIT_WINDOW, REDIS_GAME_RATE_LIMIT, REDIS_GAME_RATE_LIMIT_WINDOW - Kept existing actix-governor middleware for per-second burst protection - Includes 4 unit tests: under-limit, exceeded, headers, independent IPs Closes OpenKnight-Foundation#865
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Overview
This PR adds a Redis-backed rate limiting middleware for actix-web that tracks request counts per client IP using Redis
INCR+EXPIRE. Unlike the existing in-memoryactix-governor(which provides per-second burst protection per worker), the Redis-backed limiter shares state across all server workers, making it suitable for sliding-window limits like "5 requests per minute" on auth endpoints.Closes #865
Changes
Redis Rate Limiter Middleware
backend/modules/api/src/rate_limiter.rs—RedisRateLimiteractix-webTransform/Servicemiddlewaredeadpool-redisconnection pool for non-blocking Redis accessINCR+EXPIRE(auto-set on first request)X-RateLimit-Limit,X-RateLimit-Remaining,X-RateLimit-ResetheadersApplied Limits
/v1/auth(login, register, refresh, logout)/v1/games(create, join, move, etc.)actix-governorEnvironment Configuration
REDIS_AUTH_RATE_LIMIT(default: 5)REDIS_AUTH_RATE_LIMIT_WINDOW(default: 60)REDIS_GAME_RATE_LIMIT(default: 30)REDIS_GAME_RATE_LIMIT_WINDOW(default: 60)Dependencies
deadpool-redis = "0.14"added tobackend/modules/api/Cargo.tomlVerification Results