fix(middleware): set rate limit headers on memory store#2985
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Add optional rateLimiterStoreContext interface so stores can set X-RateLimit-Limit, X-RateLimit-Remaining, and Retry-After headers. RateLimiterMemoryStore implements it using golang.org/x/time/rate. Fixes labstack#2961 Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
Fixes #2961
Rate limit middleware now sets standard rate limit response headers when using the built-in
RateLimiterMemoryStore:X-RateLimit-Limit— configured burstX-RateLimit-Remaining— tokens remaining after the requestRetry-After— seconds until the next token is available (on 429 only)Implementation follows the maintainer suggestion from the issue: an optional unexported
rateLimiterStoreContextinterface withAllowContext(c echo.Context, identifier string) (bool, error). When the configured store implements it, the middleware calls it instead ofAllow. Custom stores can opt in without breaking the existingRateLimiterStoreAPI.Retry-Afteris computed viarate.Limiter.ReserveN(...).Delay()as suggested in the issue discussion.Test plan
go test ./middleware -run TestRateLimitergo test -race ./middleware -run TestRateLimiterMemoryStoreTestRateLimiterMemoryStore_AllowContext_SetsHeadersverifies headers on allowed and denied requestsMade with Cursor