refactor out cronning

src/cmd/asses/main.go

@@ -4,34 +4,11 @@ import (
 	"context"
 	"io"
 	"show-rss/src/asses"
-	"time"
+	"show-rss/src/cron"
 )
 
 func Main(ctx context.Context) error {
-	next, err := asses.Next(ctx)
-	if err != nil {
-		return err
-	}
-
-	c := time.NewTicker(3 * time.Hour)
-	defer c.Stop()
-	for {
-		select {
-		case <-ctx.Done():
-		case <-c.C:
-		case <-time.After(time.Until(next)):
-		}
-
-		if err := One(ctx); err != nil {
-			return err
-		}
-
-		next, err = asses.Next(ctx)
-		if err != nil {
-			return err
-		}
-	}
-	return ctx.Err()
+	return cron.Cron(ctx, asses.Next, One)
 }
 
 func One(ctx context.Context) error {