Add fetching of addresses from proxyGetConfig endpoint

mtglib/internal/dc/updater.go

@@ -0,0 +1,39 @@
+package dc
+
+import (
+	"context"
+	"time"
+)
+
+type updater struct {
+	logger Logger
+	period time.Duration
+}
+
+func (u updater) run(ctx context.Context, callback func() error) {
+	ticker := time.NewTicker(u.period)
+
+	defer func() {
+		ticker.Stop()
+
+		select {
+		case <-ticker.C:
+		default:
+		}
+	}()
+
+	for {
+		u.logger.Info("start update")
+		if err := callback(); err != nil {
+			u.logger.WarningError("cannot update: %w", err)
+		}
+		u.logger.Info("updated")
+
+		select {
+		case <-ctx.Done():
+			u.logger.Info("stop updating")
+			return
+		case <-ticker.C:
+		}
+	}
+}