{"id":"f592ab35be81fe2d","repo":"gofiber/fiber","slug":"limiter-failed-to-get-key-q-from-storage-w","errorCode":null,"errorMessage":"limiter: failed to get key %q from storage: %w","messagePattern":"limiter: failed to get key %q from storage: %w","errorType":"http","errorClass":null,"httpStatus":null,"severity":"error","filePath":"middleware/limiter/manager.go","lineNumber":70,"sourceCode":"// acquire returns an *entry from the sync.Pool\nfunc (m *manager) acquire() *item {\n\treturn m.pool.Get().(*item) //nolint:forcetypeassert,errcheck // We store nothing else in the pool\n}\n\n// release and reset *entry to sync.Pool\nfunc (m *manager) release(e *item) {\n\te.prevHits = 0\n\te.currHits = 0\n\te.exp = 0\n\tm.pool.Put(e)\n}\n\n// get data from storage or memory\nfunc (m *manager) get(ctx context.Context, key string) (*item, error) {\n\tif m.storage != nil {\n\t\traw, err := m.storage.GetWithContext(ctx, key)\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"limiter: failed to get key %q from storage: %w\", m.logKey(key), err)\n\t\t}\n\t\tif raw != nil {\n\t\t\tit := m.acquire()\n\t\t\tif _, err := it.UnmarshalMsg(raw); err != nil {\n\t\t\t\tm.release(it)\n\t\t\t\treturn nil, fmt.Errorf(\"limiter: failed to unmarshal key %q: %w\", m.logKey(key), err)\n\t\t\t}\n\t\t\treturn it, nil\n\t\t}\n\t\treturn m.acquire(), nil\n\t}\n\n\tvalue := m.memory.Get(key)\n\tif value == nil {\n\t\treturn m.acquire(), nil\n\t}\n\n\tit, ok := value.(*item)","sourceCodeStart":52,"sourceCodeEnd":88,"githubUrl":"https://github.com/gofiber/fiber/blob/9a4c7e57fe0b080a04235d28a4b0d2b4b353d58c/middleware/limiter/manager.go#L52-L88","documentation":"Returned by manager.get (manager.go:68-71) when Storage.GetWithContext fails while loading the counter for a rate-limit key. This is the upstream cause that propagates through both FixedWindow and SlidingWindow handlers; the manager wraps it with the key (redacted if DisableValueRedaction is false).","triggerScenarios":"Remote Storage (Redis/MySQL/Mongo/etc.) returns an error on GetWithContext: connection lost, query deadline exceeded, auth failure mid-run, or context cancelled. A cache miss returns (nil, nil) and does NOT trigger this — only an actual error does.","commonSituations":"Storage restart during traffic; TLS cert rotated without reloading the app; network partition to the storage pod; KeyGenerator producing keys that overflow storage key-size limits and trigger backend errors.","solutions":["Healthcheck Storage at startup and on an interval; fail fast on misconfiguration.","Tune the storage connection pool size to match peak RPS — under-sizing causes Get timeouts.","Verify KeyGenerator output is within the storage's key-size rules.","Wrap the limiter to fail open on storage errors if rate limiting is best-effort for your service."],"exampleFix":"// before\napp.Use(limiter.New(limiter.Config{Storage: redis.New()}))\n\n// after — validated pool + fail-open around limiter errors\nstore := redis.New(redis.Config{PoolSize: 128})\napp.Use(func(c fiber.Ctx) error {\n    err := limiter.New(limiter.Config{Storage: store})(c)\n    if err != nil {\n        log.Printf(\"limiter storage get failed: %v — fail open\", err)\n        return c.Next()\n    }\n    return nil\n})","handlingStrategy":"fallback","validationCode":"// startup storage read check\nctx, cancel := context.WithTimeout(context.Background(), time.Second)\ndefer cancel()\nif _, err := store.GetWithContext(ctx, \"__hc__\"); err != nil {\n    log.Fatalf(\"limiter storage unreadable: %v\", err)\n}","typeGuard":null,"tryCatchPattern":"// fail open on storage read errors so rate-limit outages don't take the app down\napp.Use(func(c fiber.Ctx) error {\n    if err := limiterHandler(c); err != nil {\n        log.Printf(\"limiter storage read failed: %v — fail open\", err)\n        return c.Next()\n    }\n    return nil\n})","preventionTips":["Size the storage connection pool to peak RPS.","Healthcheck Storage on an interval, not just at startup.","Verify KeyGenerator output stays within the storage's key-size limits."],"tags":["limiter","storage","read","redis","manager"],"analyzedSha":"9a4c7e57fe0b080a04235d28a4b0d2b4b353d58c","analyzedAt":"2026-08-04T21:44:03.395Z","schemaVersion":2}