Initial commit: IT Nexus Web-App

nexus-scanner/internal/scheduler/scheduler.go

@@ -0,0 +1,63 @@
+package scheduler
+
+import (
+	"context"
+	"log/slog"
+	"time"
+
+	"github.com/cereda-systems/nexus-scanner/internal/module"
+)
+
+// Scheduler runs registered modules at their configured intervals.
+type Scheduler struct {
+	registry *module.Registry
+}
+
+// New returns a new Scheduler backed by the given registry.
+func New(registry *module.Registry) *Scheduler {
+	return &Scheduler{registry: registry}
+}
+
+// Run starts all modules in background goroutines and blocks until ctx is cancelled.
+func (s *Scheduler) Run(ctx context.Context) {
+	for _, m := range s.registry.All() {
+		go s.runModule(ctx, m)
+	}
+	<-ctx.Done()
+}
+
+func (s *Scheduler) runModule(ctx context.Context, m module.Module) {
+	log := slog.With("module", m.Name())
+
+	// Run immediately on startup.
+	s.execute(ctx, m, log)
+
+	// If interval is zero, run once and stop.
+	if m.Interval() == 0 {
+		return
+	}
+
+	ticker := time.NewTicker(m.Interval())
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-ticker.C:
+			s.execute(ctx, m, log)
+		}
+	}
+}
+
+func (s *Scheduler) execute(ctx context.Context, m module.Module, log *slog.Logger) {
+	log.Info("run started")
+	start := time.Now()
+
+	if err := m.Run(ctx); err != nil {
+		log.Error("run failed", "err", err, "elapsed", time.Since(start).Round(time.Millisecond))
+		return
+	}
+
+	log.Info("run completed", "elapsed", time.Since(start).Round(time.Millisecond))
+}