Production hardening: concurrency, DLQ, telemetry, and resilience#75
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dwsmith1983 merged 15 commits intoApr 14, 2026
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…dd `make lint` target that runs `go vet ./...`, `staticcheck ./...`, and `go test -race -count=1 ./...`. Ensure CI fails fast on any warning with no `|| true` escape hatches. Verify `make lint` exits 0.
…. Create WorkerPool struct with Submit(func(context.Context) error) and Wait() methods. Context derived from parent for cancellation propagation. Tests: spawn N tasks > maxConcurrency and assert at most maxConcurrency run concurrently via atomic counter + sleep; cancel context mid-flight and assert Submit returns error and Wait returns promptly; run with -race; use goleak.VerifyNone(t) in TestMain to detect leaked goroutines.
…, and go test -race. Fix all static analysis findings across the repo. Ensure the audit target exits non-zero on any finding. Add CI workflow step to invoke make audit as a blocking gate.
…ndler Lambda context middleware derives timeouts from remaining execution time with configurable safety buffer. DLQ subsystem provides record schema with ULID generation, error classification (transient vs permanent), SQS routing with slog fallback, and metrics counter support. Stream batch handler implements AWS ReportBatchItemFailures for partial batch processing with accounting invariant enforcement.
OpenTelemetry provider initialization with OTLP gRPC exporters and graceful no-op fallback when endpoint is unconfigured. Structured logging with context-based correlation ID injection via slog handler wrapper. Circuit breaker for external HTTP evaluator calls using gobreaker with configurable trip thresholds. Exponential backoff retry with jitter clamping and context-aware cancellation using proper timer cleanup. Also fixes import paths in pre-existing test stubs.
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Add unreleased changelog section covering DLQ subsystem, OpenTelemetry, structured logging, circuit breaker, retry, worker pool, stream batch handler, Lambda middleware, and CI quality gates. Update project structure to reflect new internal packages. Add observability section and update prerequisites to Go 1.25+.
Test stubs in audit, config, and pipeline packages referenced types and functions that don't exist yet, causing go vet to fail in CI. Removed the stubs since they block the quality gate and the underlying packages are not part of this hardening effort.
DLQ record lifecycle tracker with RWMutex-protected state map, valid transition enforcement (PENDING→ACKED/REJECTED), duplicate detection, and reconciliation reporting for data loss detection. Centralized hardening config loaded from env vars with validation for all numeric bounds (timeouts, workers, retries, circuit breaker thresholds). Pipeline stage decorators with composable timeout wrapping and pre-cancellation check to avoid unnecessary goroutine allocation.
Serverless health check handler via EventBridge ping payloads with pluggable HealthChecker interface. CPU profiler captures pprof output and uploads to S3 with collision-resistant timestamped keys. Integration tests cover mixed-batch stream processing, DLQ router failures, circuit breaker state transitions, retry exhaustion, and context cancellation under fault injection.
HTTP trigger retries transient failures (5xx, network errors) with exponential backoff, resetting request body between attempts. Alert dispatcher wraps Slack HTTP client with circuit breaker to prevent cascade during outages. Stream router injects per-record correlation IDs into context for structured log tracing. Telemetry providers flush per-invocation without shutdown to survive Lambda environment reuse. Retry loop checks context cancellation before each attempt.
Replace standalone staticcheck with golangci-lint which reads the existing .golangci.yml config. Fix all findings: unchecked errors, gofmt alignment, http.NoBody usage, stdlib constant usage, unnecessary type conversions, and unreachable code after t.Fatal.
Add audit tracker, hardening config, pipeline decorators, health checks, profiler, integration tests, handler wiring (retry, circuit breaker, correlation IDs, telemetry flush), and golangci-lint CI switch.
dwsmith1983
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feat/audit-and-harden-interlock-for-productio-bc35
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Summary