Class: CfnDsl::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/cfndsl/runner.rb

Overview

Runner class to handle commandline invocation

Class Method Summary collapse

Class Method Details

.invoke! ⇒ Object

rubocop:disable Metrics/MethodLength, Metrics/AbcSize, Metrics/PerceivedComplexity, Metrics/CyclomaticComplexity



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# File 'lib/cfndsl/runner.rb', line 12

def self.invoke!
  options = {}

  optparse = OptionParser.new do |opts|
    opts.version = CfnDsl::VERSION
    opts.banner = 'Usage: cfndsl [options] FILE'

    # Define the options, and what they do
    options[:output] = '-'
    opts.on('-o', '--output FILE', 'Write output to file') do |file|
      options[:output] = file
    end

    options[:extras] = []
    opts.on('-y', '--yaml FILE', 'Import yaml file as local variables') do |file|
      options[:extras].push([:yaml, File.expand_path(file)])
    end

    opts.on('-j', '--json FILE', 'Import json file as local variables') do |file|
      options[:extras].push([:json, File.expand_path(file)])
    end

    opts.on('-p', '--pretty', 'Pretty-format output JSON') do
      options[:pretty] = true
    end

    opts.on('-f', '--format FORMAT', 'Specify the output format (JSON default)') do |format|
      raise "Format #{format} not supported" unless %w[json yaml].include? format

      options[:outformat] = format
    end

    opts.on('-D', '--define "VARIABLE=VALUE"', 'Directly set local VARIABLE as VALUE') do |file|
      options[:extras].push([:raw, file])
    end

    options[:verbose] = false
    opts.on('-v', '--verbose', 'Turn on verbose output') do
      options[:verbose] = true
    end

    opts.on('-m', '--disable-deep-merge', 'Disable deep merging of yaml') do
      CfnDsl.disable_deep_merge
    end

    # TODO: Support options to add a spec/patches dir
    opts.on('-s', '--specification-file FILE', 'Location of Cloudformation Resource Specification file') do |file|
      CfnDsl.specification_file File.expand_path(file)
    end

    opts.on('-u', '--update-specification [VERSION]', 'Update the Resource Specification file to latest, or specific version') do |file|
      options[:spec_version] = file || 'latest'
      options[:update_spec] = true
    end

    opts.on('-g', '--generate RESOURCE_TYPE,RESOURCE_LOGICAL_NAME', 'Add resource type and logical name') do |r|
      options[:lego] = true
      options[:resources] = []
      options[:resources] << r
    end

    opts.on('-a', '--assetversion', 'Print out the specification version') do
      options[:assetversion] = true
    end

    opts.on('-l', '--list', 'List supported resources') do
      require_relative 'cfnlego'
      puts Cfnlego.resources.sort
      exit
    end

    # This displays the help screen, all programs are
    # assumed to have this option.
    opts.on('-h', '--help', 'Display this screen') do
      puts opts
      exit
    end
  end

  optparse.parse!

  if options[:update_spec]
    warn 'Updating specification file'
    result = CfnDsl.update_specification_file(version: options[:spec_version])
    warn "Specification #{result[:version]} successfully written to #{result[:file]}"
  end

  if options[:assetversion]
    spec_file = JSON.parse File.read(CfnDsl.specification_file)
    warn spec_file['ResourceSpecificationVersion']
  end

  if options[:lego]
    require_relative 'cfnlego'
    puts Cfnlego.run(options)
    exit
  end

  if ARGV.empty?
    if options[:update_spec] || options[:assetversion]
      exit 0
    else
      puts optparse.help
      exit 1
    end
  end

  filename = File.expand_path(ARGV[0])
  verbose = options[:verbose] && $stderr

  verbose.puts "Using specification file #{CfnDsl.specification_file}" if verbose

  require_relative 'cloudformation'
  model = CfnDsl.eval_file_with_extras(filename, options[:extras], verbose)

  output = $stdout
  if options[:output] != '-'
    verbose.puts("Writing to #{options[:output]}") if verbose
    output = File.open(File.expand_path(options[:output]), 'w')
  elsif verbose
    verbose.puts('Writing to STDOUT')
  end

  if options[:outformat] == 'yaml'
    data = model.to_json
    output.puts JSON.parse(data).to_yaml
  else
    output.puts options[:pretty] ? JSON.pretty_generate(model) : model.to_json
  end
end