Function GetIP

e2e/network_allocator.go:64–82

GetIP returns an IP address within the allocated subnet for a given host suffix. It reserves the last octet for the requested suffix, so callers should use small host numbers such as 2, 10, 100, etc.

(subnet string, suffix int)

// It reserves the last octet for the requested suffix, so callers should use small
// host numbers such as 2, 10, 100, etc.
func GetIP(subnet string, suffix int) string {
	prefix, err := netip.ParsePrefix(subnet)
	if err != nil {
		panic(fmt.Sprintf("invalid subnet format: %s", subnet))
	}

	addr := prefix.Addr()
	if !addr.Is4() {
		panic(fmt.Sprintf("unsupported non-IPv4 subnet: %s", subnet))
	}

	bytes := addr.As4()
	bytes[3] = byte(suffix)
	ip := netip.AddrFrom4(bytes)
	if !prefix.Contains(ip) {
		panic(fmt.Sprintf("requested IP %s is outside subnet %s", ip, subnet))
	}
	return ip.String()
}