Validate CloudFormation templates with aws-sdk

Rakefile

require 'aws-sdk'

def validate_template(body)
  cfn = AWS::CloudFormation.new
  cfn.validate_template(body)
end

desc 'Validate CloudFormation template files'
task :test do
  Dir.glob('*.json').each do |template|
    puts "Validating template #{template}"
    result = validate_template(File.read(template))
    if result.has_key?(:code)
      abort "#{result[:code]}: #{result[:message]}"
    end
    # Do not exceed API rate limit
    sleep(0.5)
  end
end