{"id":"182b8e4d161b9ad9","repo":"gofiber/fiber","slug":"limiter-failed-to-store-key-q-w","errorCode":null,"errorMessage":"limiter: failed to store key %q: %w","messagePattern":"limiter: failed to store key %q: %w","errorType":"http","errorClass":null,"httpStatus":null,"severity":"error","filePath":"middleware/limiter/manager.go","lineNumber":106,"sourceCode":"\tit, ok := value.(*item)\n\tif !ok {\n\t\treturn nil, fmt.Errorf(\"limiter: unexpected entry type %T for key %q\", value, m.logKey(key))\n\t}\n\n\treturn it, nil\n}\n\n// set data to storage or memory\nfunc (m *manager) set(ctx context.Context, key string, it *item, exp time.Duration) error {\n\tif m.storage != nil {\n\t\traw, err := it.MarshalMsg(nil)\n\t\tif err != nil {\n\t\t\tm.release(it)\n\t\t\treturn fmt.Errorf(\"limiter: failed to marshal key %q: %w\", m.logKey(key), err)\n\t\t}\n\t\tif err := m.storage.SetWithContext(ctx, key, raw, exp); err != nil {\n\t\t\tm.release(it)\n\t\t\treturn fmt.Errorf(\"limiter: failed to store key %q: %w\", m.logKey(key), err)\n\t\t}\n\t\tm.release(it)\n\t\treturn nil\n\t}\n\n\tm.memory.Set(key, it, exp)\n\treturn nil\n}\n\nfunc (m *manager) logKey(key string) string {\n\tif m.shouldRedactKeys {\n\t\treturn redactedKey\n\t}\n\treturn key\n}\n","sourceCodeStart":88,"sourceCodeEnd":122,"githubUrl":"https://github.com/gofiber/fiber/blob/9a4c7e57fe0b080a04235d28a4b0d2b4b353d58c/middleware/limiter/manager.go#L88-L122","documentation":"Returned by manager.set when storage.SetWithContext fails while persisting the marshaled limiter item for a key. This is a backend-level write failure propagated from the configured fiber.Storage.","triggerScenarios":"Limiter uses external fiber.Storage and storage.SetWithContext(ctx, key, raw, exp) returns an error at manager.go:104. Occurs when the storage backend is unreachable, rejecting writes, out of memory, or the context is canceled/timed out.","commonSituations":"Redis/connection down or flapping; storage max-memory eviction; network partition; request context canceled before the write completes; misconfigured storage TLS/auth.","solutions":["Verify storage backend connectivity and health from the application host.","Check storage logs for memory, eviction, or auth errors.","Ensure the limiter's effective context deadline is long enough for the storage write.","If transient, the next request will retry the write; consider a storage with retries."],"exampleFix":null,"handlingStrategy":"retry","validationCode":"// Pre-flight: verify the storage backend accepts writes before serving\n// traffic.\nfunc storageWritable(s fiber.Storage) error {\n    if err := s.Set(\"probe\", []byte{1}, time.Second); err != nil {\n        return err\n    }\n    return s.Delete(\"probe\")\n}","typeGuard":null,"tryCatchPattern":"// Storage write failures are often transient; return 503 so the client\n// can retry and the next request re-attempts the write.\nif strings.Contains(err.Error(), \"failed to store key\") {\n    return c.Status(fiber.StatusServiceUnavailable).\n        Set(\"Retry-After\", \"1\").\n        SendString(\"rate limit store busy\")\n}","preventionTips":["Monitor storage backend latency, memory, and connection counts.","Give the limiter a request context with adequate deadline for writes.","Use a storage with built-in retries / connection pooling.","Alert on rising write-error rates from the storage backend."],"tags":["limiter","storage","redis","persistence","network"],"analyzedSha":"9a4c7e57fe0b080a04235d28a4b0d2b4b353d58c","analyzedAt":"2026-08-04T21:44:03.395Z","schemaVersion":2}