[Fix] RedisRateLimiter INCR/EXPIRE 비원자성 수정 - #399
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📝 WalkthroughWalkthrough
ChangesRedis 레이트리밋 원자 처리
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to 이 변경은 카운터 증가와 만료 설정을 원자화하지만, 실제 Redis에서 스크립트·TTL·리소스 패키징을 검증하지 않았고 실행 실패 시 rate limiting이 비활성화될 수 있습니다. 또한 만료시간이 없는 기존 제한 키는 계속 남아 특정 클라이언트의 요청을 영구적으로 제한할 수 있으므로, 병합 전 검증과 정리 또는 보정 방안이 필요합니다. Poem
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Inline comments:
In `@src/main/resources/redis/rate-limit-incr.lua`:
- Around line 5-6: Update the rate-limit Lua script so keys with no expiration
(TTL -1) receive an EXPIRE after incrementing, including when count is greater
than 1; calculate the expiration using the current window’s remaining time
rather than the full windowSeconds, and add the requested cleanup path for
existing ratelimit:* keys before deployment.
In `@src/test/java/com/semosan/api/common/ratelimit/RedisRateLimiterTest.java`:
- Around line 57-61: Replace the mocked RedisTemplate.execute coverage in
RedisRateLimiterTest with an actual Redis integration setup that loads and runs
RedisRateLimiter.INCR_SCRIPT/rate-limit-incr.lua. Verify the first tryConsume
call creates the counter with a positive TTL, subsequent calls do not refresh
that TTL, and a new window starts after expiration, while retaining coverage for
the expected increment and expiration behavior.
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src/main/java/com/semosan/api/common/ratelimit/RedisRateLimiter.javasrc/main/resources/redis/rate-limit-incr.luasrc/test/java/com/semosan/api/common/ratelimit/RedisRateLimiterTest.java
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🧾 요약
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✨ 변경 내용
redis/rate-limit-incr.lua추가 — INCR + 최초 요청 시 EXPIRE를 Redis 서버 내 단일 스크립트로 원자 처리 (TrackingSessionStatsService와 동일 패턴)RedisRateLimiter.tryConsume()이increment()+expire()2단계 대신DefaultRedisScript1회 실행으로 카운트 증가RedisRateLimiterTest를 Lua 스크립트 실행 검증 방식으로 갱신 (한도 이내/동일/초과, fail-open, windowSeconds 인자 전달)✅ 확인
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