auto get a desired ip range for aws-lightsail-jp

main.rb

require 'aws-sdk-lightsail'

ls = Aws::Lightsail::Client.new(region: "ap-northeast-1")

pattern = /^(103|175|46)/
instance_name = "vm"
ip_pool = Set.new
ip_names = 4.times.map { |i| "vm-ip-#{i}" }

loop do
  ip_names.each { |ip_name| ls.allocate_static_ip(static_ip_name: ip_name) }
  found = false
  ip_names.each do |ip_name|
    ip = ls.get_static_ip(static_ip_name: ip_name).static_ip.ip_address
    ip_pool.add(ip)
    puts ip
    if ip.match?(pattern)
      found = true
      ls.attach_static_ip(static_ip_name: ip_name, instance_name: instance_name)
      (ip_names - [ip_name]).each { |x| ls.release_static_ip(static_ip_name: x) }
      break
    end
  end
  break if found
  ip_names.each { |ip_name| ls.release_static_ip(static_ip_name: ip_name) }
  puts "pass ip count #{ip_pool.size}"
  puts "not found, wait 30s"
  sleep(30)
end