gistfile1.txt

class OldAmi
  require 'aws-sdk'
  require 'pp'
  require 'date'

  def initialize(days_old)
    @images = Hash.new
    get_regions.each do |region|
      @old_amis       = list_old_ami(region, days_old)
      @amis_to_save   = get_amis_to_save(region)
      @amis_to_delete = @old_amis - @amis_to_save
      @amis_to_delete.each { |ami| print_ami(ami, region) }

    end

  end

  def list_old_ami(region, days_old)
    ec2 = Aws::EC2::Client.new(region: region)
    ec2.describe_images({ :owners => ['self'] }).images.select { |image| days_old?(image, days_old) }.map { |i| i.to_h[:image_id] }
  end

  def days_old?(instance, days_old)
    instance_date = conv_date(instance.to_h[:creation_date])
    days          = Date.today - days_old
    begin
      instance_date < days
    rescue
      nil
    end
  end

  def conv_date(date_str)
    begin
      Date.parse(date_str)
    rescue
      nil
    end
  end

  def get_regions
    ec2 = Aws::EC2::Client.new(region: 'us-east-1')
    ec2.describe_regions.to_h[:regions].map { |r| r[:region_name] }
  end

  def get_amis_to_save(region)
    ec2 = Aws::AutoScaling::Client.new(region: region)
    lc  = ec2.describe_launch_configurations
    lc.to_h[:launch_configurations].map { |image| image[:image_id] }.uniq
  end

  def print_ami(image, region)
    ec2 = Aws::EC2::Resource.new(region: region)
    ami = ec2.image(image)
    puts "#{ami.name}, #{ami.image_id}, #{ami.creation_date}, #{region}"
  end

end
OldAmi.new(180)