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func Retry(retryMax uint, interval time.Duration, fn func(a ...interface{}) (interface{}, error), fnParams ...interface{}) (res interface{}, err error) {
	if res, err = fn(fnParams...); err != nil {
		if retryMax--; retryMax > 0 {
			time.Sleep(interval)
			return Retry(retryMax, interval, fn, fnParams...)
		}
	}
	return
}