修正windows下未启动服务无法重启的问题

agent.go

@@ -107,5 +107,12 @@ func Restart(app App) error {
 	if err != nil {
 		return err
 	}
+	status, err := svc.Status()
+	if err != nil {
+		return err
+	}
+	if status == service.StatusStopped {
+		return svc.Start()
+	}
 	return svc.Restart()
 }

agent_test.go

@@ -0,0 +1,52 @@
+package agent
+
+import (
+	"context"
+	"testing"
+
+	"github.com/jkstack/anet"
+	"github.com/jkstack/libagent/conf"
+)
+
+type agent struct{}
+
+func (a *agent) AgentName() string {
+	return "example-agent"
+}
+
+func (a *agent) Version() string {
+	return "0.0.0"
+}
+
+func (a *agent) ConfDir() string {
+	return "./conf"
+}
+
+func (a *agent) Configure() *conf.Configure {
+	return &conf.Configure{}
+}
+
+func (a *agent) OnRewriteConfigure() error {
+	return nil
+}
+
+func (a *agent) OnConnect() {
+}
+
+func (a *agent) OnDisconnect() {
+}
+
+func (a *agent) OnReportMonitor() {
+}
+
+func (a *agent) OnMessage(*anet.Msg) error {
+	return nil
+}
+
+func (a *agent) LoopWrite(context.Context, chan *anet.Msg) error {
+	select {}
+}
+
+func TestRestart(t *testing.T) {
+	Restart(&agent{})
+}