{"record":{"id":"7e4b8b9ef59918e9","repo":"gofiber/fiber","slug":"limiter-failed-to-persist-state-w","errorCode":null,"errorMessage":"limiter: failed to persist state: %w","messagePattern":"limiter: failed to persist state: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"middleware/limiter/limiter_fixed.go","lineNumber":85,"sourceCode":"\t\t\t// Check if entry is expired\n\t\t\te.currHits = 0\n\t\t\te.exp = ts + expiration\n\t\t}\n\n\t\t// Increment hits\n\t\te.currHits++\n\n\t\t// Calculate when it resets in seconds\n\t\tresetInSec := e.exp - ts\n\t\twindowExpiresAt := e.exp\n\n\t\t// Set how many hits we have left\n\t\tremaining := maxRequests - e.currHits\n\n\t\t// Update storage\n\t\tif setErr := manager.set(reqCtx, key, e, expirationDuration); setErr != nil {\n\t\t\tmux.Unlock()\n\t\t\treturn fmt.Errorf(\"limiter: failed to persist state: %w\", setErr)\n\t\t}\n\n\t\t// Unlock entry\n\t\tmux.Unlock()\n\n\t\t// Check if hits exceed the max\n\t\tif remaining < 0 {\n\t\t\t// Return response with Retry-After header\n\t\t\t// https://tools.ietf.org/html/rfc6584\n\t\t\tif !cfg.DisableHeaders {\n\t\t\t\tc.Set(fiber.HeaderRetryAfter, utils.FormatUint(resetInSec))\n\t\t\t}\n\n\t\t\t// Call LimitReached handler\n\t\t\treturn cfg.LimitReached(c)\n\t\t}\n\n\t\t// Continue stack for reaching c.Response().StatusCode()","sourceCodeStart":67,"sourceCodeEnd":103,"githubUrl":"https://github.com/gofiber/fiber/blob/a105acad6c1e4576a77f01e02973f67e962bb58d/middleware/limiter/limiter_fixed.go#L67-L103","documentation":"Returned by the fixed-window limiter on the increment path: after counting a hit and calling manager.set(reqCtx, key, e, expirationDuration), the storage write failed. The wrapped %w is from manager.set (marshal failure or Storage.SetWithContext failure). The mutex is released before returning; the request is aborted with no rate-limit headers set.","triggerScenarios":"limiter_fixed handler increments currHits and calls manager.set, which either fails to marshal the item (msgpack) or fails to write to the configured Storage. Fires when a shared storage (Redis/MySQL/etc.) is unavailable or rejects the write.","commonSituations":"Distributed limiter with a Storage backend that is down/overloaded, a storage client with too-small connection pool, msgpack schema drift after upgrade, or context cancellation while persisting.","solutions":["Verify storage connectivity, capacity, and credentials.","If you do not need cross-instance limiting, omit Storage to fall back to in-memory (per-process) limiting that never hits this path.","Regenerate msgpack (`make generate`) after middleware upgrades.","Tune storage client timeouts and pool size to absorb bursts."],"exampleFix":"// before\napp.Use(limiter.New(limiter.Config{Storage: redisClient}))\n// after — fall back to memory if Redis unavailable\nif redisErr == nil {\n    app.Use(limiter.New(limiter.Config{Storage: redisClient}))\n} else {\n    app.Use(limiter.New(limiter.Config{})) // in-memory\n}","handlingStrategy":"fallback","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":["If cross-instance limiting is optional, omit Storage to use in-memory.","Keep shared storage healthy and properly pooled.","Regenerate msgpack after middleware upgrades."],"tags":["limiter","fixed-window","storage","rate-limiting"],"backgroundTag":null,"analyzedSha":"a105acad6c1e4576a77f01e02973f67e962bb58d","analyzedAt":"2026-08-11T17:33:26.942Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}