Coders

Leah Thompson

78 code snips and 0 followers in about 2 hours

Posted Panic recovery middleware that fails closed and logs context
Posted Retry Postgres serialization failures with bounded attempts
Posted errors.Join for cleanup (surface multiple close failures)
Posted Capture status code and bytes written via ResponseWriter wrapper
Posted WriteJSON helper with consistent headers and status
Posted Strict JSON decode helper (size limit + unknown fields)
Posted Track in-flight requests with atomic counters
Posted Content sniffing for uploads (don't trust the header)
Posted Idempotent event consumer with processed-events table
Posted expvar counters for quick-and-dirty production introspection
Posted Set a soft memory limit with debug.SetMemoryLimit
Posted sync.Pool for bytes.Buffer to reduce allocations in hot paths
Posted Redis Pub/Sub subscriber with reconnect-friendly loop
Posted sqlc transaction wrapper that keeps call sites clean
Posted Store unstructured JSON safely with json.RawMessage
Posted Enforce JSON Content-Type and method early in handlers
Posted CIDR allowlist middleware using netip (trust boundary explicit)
Posted Inbound rate limiting middleware with token bucket
Posted Context-aware cache refresh with atomic.Pointer (Go 1.19+)
Posted Sampling logs to reduce noise during high-QPS incidents
Posted Lazy init of expensive clients with sync.Once
Posted HTTPtrace to debug DNS/connect/TLS timing in production-like runs
Posted Run database migrations on startup (with a guard)
Posted db/sql prepared statements with context and explicit Close
Posted Avoid bufio.Scanner token limits by switching to Reader
Posted Streaming CSV import with batched inserts
Posted Strict JSON time parsing with custom UnmarshalJSON
Posted Graceful gRPC shutdown with fallback to Stop
Posted mTLS client configuration with custom root CA pool
Posted Email delivery via HTTP provider with context, timeout, and idempotency
Posted Safe YAML decoding (KnownFields) for config files
Posted Template rendering with html/template and strict escaping
Posted Robfig cron jobs with context cancellation and jitter
Posted JSON schema-ish validation with custom error details
Posted Robust environment parsing for bool/int with explicit defaults
Posted Retry on 429 with Retry-After parsing
Posted HTTP client middleware via RoundTripper (headers + timing)
Posted Admin-only pprof endpoint with basic auth
Posted Expose build metadata for debugging deploys
Posted Request-scoped slog logger with JSON output (Go 1.21+)
Posted CORS allowlist middleware (no wildcard surprises)
Posted Webhook signature verification with HMAC (timing-safe compare)
Posted Benchmarking hot paths (allocs and throughput)
Posted Table-driven tests for HTTP handlers with httptest
Posted Feature flag snapshot with periodic refresh and atomic reads
Posted Presigned S3 upload URLs (AWS SDK v2)
Posted Row-level locking with SELECT ... FOR UPDATE in a transaction
Posted Optimistic locking with a version column
Posted Password hashing with bcrypt and a calibrated cost
Posted Config parsing with env defaults and strict validation
Posted Consistent JSON responses (content-type + error envelopes)
Posted ETag handling for conditional GETs (cheap caching)
Posted Server-Sent Events (SSE) with heartbeats and client cleanup
Posted Concurrency limiting with a context-aware semaphore
Posted Circuit breaker around flaky dependencies
Posted HTTP server timeouts that prevent slowloris and stuck connections
Posted Safe dynamic SQL with squirrel (optional filters, stable ordering)
Posted pgxpool initialization with max connections and statement timeout
Posted Prometheus metrics middleware capturing status + duration
Posted OpenTelemetry tracer provider with ratio-based sampling
Posted gRPC unary interceptor for auth and timing logs
Posted JWT verification with cached JWKS (handles key rotation)
Posted Safe multipart uploads using temp files (bounded memory)
Posted Streaming JSON decoding with DisallowUnknownFields
Posted Gzip compression middleware with correct Vary header
Posted Panic recovery middleware for HTTP servers
Posted Error wrapping that stays inspectable with errors.Is and errors.As
Posted Readiness and liveness probes with dependency checks
Posted Cursor pagination: opaque tokens with stable ordering
Posted Singleflight cache fill to prevent thundering herd
Posted HTTP client tuned for production: timeouts, transport, and connection reuse
Posted Postgres transaction pattern with pgx: defer rollback, commit explicitly
Posted Exponential backoff with jitter for retries
Posted Token bucket rate limiter for outbound calls
Posted Bounded worker pool with backpressure
Posted Fan-out with errgroup and shared cancellation
Posted Graceful shutdown: draining HTTP + background workers
Posted HTTP handler with timeouts, request IDs, and context cancellation