$ show gofiber/contrib
This is a monorepo of first-party middleware and service implementations for the Fiber web framework (v3). It provides production-grade authentication (JWT, PASETO, SPNEGO/Kerberos), authorization (Casbin, OPA), observability (OpenTelemetry, Prometheus, New Relic, Sentry, custom monitor/uptime dashboards), real-time communication (WebSocket, Socket.IO v5), Web Application Firewall (Coraza), resilience patterns (circuit breaker, CPU load shedding), structured logging (zap, zerolog), internationalization, hCaptcha verification, Swagger UI/OpenAPI docs, profiling (fgprof), and Testcontainers integration for testing. Each package lives in its own Go module under v3/, following a consistent Config+New() pattern and includes extensive test coverage with benchmarks. The architecture is library-oriented: components are imported by Fiber applications, not run standalone. The codebase demonstrates strong engineering practices: config validation at construction, atomic concurrency patterns, lock-free read paths, and protocol-level optimizations (e.g., zero-copy Socket.IO codec, WebSocket write coalescing). Some packages show signs of technical drift (e.g., paseto uses a deprecated library, socketio has mutable package globals), but overall the repository is actively maintained with weekly releases and automated dependency updates.
The LLM identified 5 files worth highlighting for reuse:
Implements the Engine.IO v4 / Socket.IO v5 wire protocol codec. Uses pre-sized buffers, SIMD-accelerated string scanning (via bytes.IndexByte), and zero-copy JSON array argument extraction to achieve ~72% faster parsing than naive JSON unmarshaling. Handles base64 binary, namespace extraction, ack ID parsing, and batched frame splitting. This component is self-contained and could be reused in any Go Socket.IO implementation.
Enforces RFC 7515 Section 4.1.11 critical header processing. Rejects JWT tokens that contain critical extension headers (like 'b64' for unencoded payloads per RFC 7797) unless the middleware explicitly understands them. This is a non-obvious security guard that prevents JWT injection attacks via unprocessed extensions. The logic is isolated and could be extracted as a standalone JWT validation utility.
Provides a write-coalescing wrapper around WebSocket connections. Buffers small writes and flushes them as a single frame after a configurable delay (default 100ms) or when the buffer is full, using time.AfterFunc and sync.Mutex. Reduces syscall overhead for chat-like workloads. The component is self-contained (implements a simple Conn interface) and could be reused for any WebSocket library.
Implements a keytab file cache with inode-based invalidation, grace period for stale data, retry throttling, and episode logging. It wraps os.Stat and os.ReadFile with atomic revision stamps, ensuring that concurrent readers get consistent data without global locks. The pattern solves a common infrastructure problem (caching file-backed credentials) and could be extracted as a general-purpose file cache.
Implements a Redis-backed uptime store using Lua scripts for atomic operations: setMaxNano, writeDailyIfUnfinalized, cleanupExpiredInstance. Handles daily rollups, instance heartbeat slots with nanosecond precision, and automatic retention cleanup. The Lua scripts are embedded as string constants, ensuring atomicity and consistency. This store implements the storage.Store interface and could be reused for any uptime monitoring system.