#!/usr/bin/env ruby
# Install dependencies with:
# gem install aws-sdk-rds aws-sdk-ec2

require 'aws-sdk-rds'
require 'aws-sdk-ec2'
require 'csv'

aws_regions = %w[us-east-1 us-east-2 us-west-1 us-west-2 sa-east-1]

CSV.open('rds-instances.csv', 'wb') do |csv|
  csv << %w[Type Multi-AZ Region Zone Identifier]

  aws_regions.each do |region|
    puts "Connecting to RDS in region #{region}"
    rds_client = Aws::RDS::Client.new(region: region)

    rds_client.describe_db_instances[:db_instances].each do |i|
      csv << [i.db_instance_class, i.multi_az, region, i.availability_zone, i.db_instance_identifier]
    end
  end
end

CSV.open('ec2-instances.csv', 'wb') do |csv|
  csv << %w[Type Region Zone KeyName]

  aws_regions.each do |region|
    puts "Connecting to EC2 in region #{region}"

    ec2_client = Aws::EC2::Client.new(region: region)

    ec2_client.describe_instances[:reservations].each do |reservation|
      reservation[:instances].each do |i|
        csv << [i.instance_type, region, i.placement.availability_zone, i.key_name]
      end
    end
  end
end