解决goroutine泄漏问题

[Alpha2J]

WHY

由于closeCh没有被初始化，在Close()函数中执行close(pxy.closeCh)的时候，会panic："panic error: close of nil channel"；导致无法退出Run()函数中创建的goroutine，造成goroutine泄漏，同时引发内存泄漏；在我的案例中，client用户单实例大概4000，运行两天，阻塞在case <-pxy.closeCh中的goroutine达到三万多；

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[fatedier]

func (pxy *XTCPProxy) Close() {
	pxy.BaseProxy.Close()
	pxy.rc.NatHoleController.CloseClient(pxy.GetName())
	_ = errors.PanicToError(func() {
		close(pxy.closeCh)
	})
}

Could you also update this to use sync.Once to ensure it only closes once? This way, we can avoid using PanicToError.

[Alpha2J]

Could you also update this to use sync.Once to ensure it only closes once? This way, we can avoid using PanicToError.

Sure, I've updated the code to use sync.Once to ensure that close(pxy.closeCh) is only called once. However, I'm still not quite sure why close(pxy.closeCh)needs to be wrapped with PanicToError. Could you please clarify the reasoning behind that? Is it due to some historical reasons or edge cases that need to be handled?

[fatedier]

This way, we can avoid using PanicToError.

Just remove it.

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