initial: ZeroTier-like P2P mesh VPN server with multi-tenant Web UI

internal/task/task.go

@@ -0,0 +1,50 @@
+package task
+
+import (
+	"context"
+	"log/slog"
+	"time"
+)
+
+type Task struct {
+	Name     string
+	Interval time.Duration
+	Handler  func(ctx context.Context) error
+}
+
+type Scheduler struct {
+	tasks []Task
+	log   *slog.Logger
+}
+
+func NewScheduler(log *slog.Logger) *Scheduler {
+	return &Scheduler{log: log.With("component", "scheduler")}
+}
+
+func (s *Scheduler) Add(name string, interval time.Duration, handler func(ctx context.Context) error) {
+	s.tasks = append(s.tasks, Task{
+		Name:     name,
+		Interval: interval,
+		Handler:  handler,
+	})
+}
+
+func (s *Scheduler) Start(ctx context.Context) {
+	for _, task := range s.tasks {
+		go func(t Task) {
+			ticker := time.NewTicker(t.Interval)
+			defer ticker.Stop()
+			s.log.Info("task started", "name", t.Name, "interval", t.Interval)
+			for {
+				select {
+				case <-ctx.Done():
+					return
+				case <-ticker.C:
+					if err := t.Handler(ctx); err != nil {
+						s.log.Error("task failed", "name", t.Name, "err", err)
+					}
+				}
+			}
+		}(task)
+	}
+}