Function PageRange

x/x.go:738–767

PageRange returns start and end indices given pagination params. Note that n is the size of the input list.

(count, offset, n int)

// PageRange returns start and end indices given pagination params. Note that n
// is the size of the input list.
func PageRange(count, offset, n int) (int, int) {
	if n == 0 {
		return 0, 0
	}
	if count == 0 && offset == 0 {
		return 0, n
	}
	if count < 0 {
		// Items from the back of the array, like Python arrays. Do a positive mod n.
		if count*-1 > n {
			count = -n
		}
		return (((n + count) % n) + n) % n, n
	}
	start := offset
	if start < 0 {
		start = 0
	}
	if start > n {
		return n, n
	}
	if count == 0 { // No count specified. Just take the offset parameter.
		return start, n
	}
	end := start + count
	if end > n {
		end = n
	}
	return start, end
}

// ValidateAddress checks whether given address can be used with grpc dial function
func ValidateAddress(addr string) error {