some small changes

tools/ticker.go

@@ -10,8 +10,8 @@ func Ticker(fn func(), interval time.Duration) chan struct{} {
 	}
 	ticker := time.NewTicker(interval)
 	stopChan := make(chan struct{})
-	fn()
 	go func() {
+		fn()
 		for {
 			select {
 			case <-ticker.C: