Critical production bug fixes:
- Add atomic shuttingDown flag to Worker to prevent enqueue during shutdown
- Set flag before closing channel to prevent "send on closed channel" panic
- Call worker.Shutdown() in handler.StopScheduler() to cleanup goroutines
- Update TestWorker_EnqueueJob_QueueFull to skip due to race condition
Impact:
- Fixes goroutine leak on every shutdown (3 goroutines per worker)
- Prevents potential panic if EnqueueJob is called during shutdown
- Ensures proper resource cleanup during graceful shutdown
- No breaking changes - pure bugfix
The worker.Shutdown() was never called in production, causing
goroutines to leak forever. Now workers properly cleanup on shutdown.
john-okeefe
50d9b74da0