fun <T> retry(maxAttempts: Int = 3,
  delay: Long = 1000,
  action: () -> T): T = tryAction(0, maxAttempts, delay, action)

fun <T> tryAction(currentAttempt: Int, maxAttempts: Int, delay: Long, action: () -> T): T {

  return try {
    action.invoke()
  } catch (e: Exception) {
    if (currentAttempt + 1 < maxAttempts) {
      if(delay > 0) try { Thread.sleep(delay) } catch (e: InterruptedException) { /* ignore */ }
      tryAction(currentAttempt + 1, maxAttempts, delay, action)
    } else {
      throw e
    }
  }
}

delay

retryBlocking