add basic scheduler

internal/scheduler/scheduler.go

@@ -0,0 +1,41 @@
+package scheduler
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"time"
+)
+
+type Scheduler struct {
+	logger *slog.Logger
+}
+
+func NewScheduler(logger *slog.Logger) *Scheduler {
+	return &Scheduler{
+		logger: logger,
+	}
+}
+
+func (s *Scheduler) Execute(ctx context.Context) error {
+	for {
+		select {
+		case <-ctx.Done():
+			s.logger.Info("gracefully shutting down scheduler")
+			return nil
+		default:
+			if err := s.process(ctx); err != nil {
+				return fmt.Errorf("scheduler failed: %w", err)
+			}
+		}
+	}
+}
+
+func (s *Scheduler) process(ctx context.Context) error {
+	s.logger.Debug("scheduler processing items")
+
+	// FIXME: simulate work
+	time.Sleep(time.Second * 5)
+
+	return nil
+}