Module: Sfn::CommandModule::Template::InstanceMethods

Defined in:
lib/sfn/command_module/template.rb

Instance Method Summary collapse

Instance Method Details

#load_template_file(*args) ⇒ Hash

Load the template file

Parameters:

  • args (Symbol) —

    options (:allow_missing)

Returns:

  • (Hash) —

    loaded template



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# File 'lib/sfn/command_module/template.rb', line 46

def load_template_file(*args)
  c_stack = (args.detect{|i| i.is_a?(Hash)} || {})[:stack]
  unless(config[:template])
    set_paths_and_discover_file!
    unless(config[:file])
      unless(args.include?(:allow_missing))
        ui.fatal "Invalid formation file path provided: #{config[:file]}"
        raise IOError.new "Failed to locate file: #{config[:file]}"
      end
    end
  end
  if(config[:template])
    config[:template]
  elsif(config[:file])
    if(config[:processing])
      sf = SparkleFormation.compile(config[:file], :sparkle)
      sparkle_packs.each do |pack|
        sf.sparkle.add_sparkle(pack)
      end
      if(sf.nested? && !sf.isolated_nests?)
        raise TypeError.new('Template does not contain isolated stack nesting! Sfn does not support mixed mixed resources within root stack!')
      end
      run_callbacks_for(:template, :stack_name => arguments.first, :sparkle_stack => sf)
      if(sf.nested? && config[:apply_nesting])
        if(config[:apply_nesting] == true)
          config[:apply_nesting] = :deep
        end
        case config[:apply_nesting].to_sym
        when :deep
          process_nested_stack_deep(sf, c_stack)
        when :shallow
          process_nested_stack_shallow(sf, c_stack)
        else
          raise ArgumentError.new "Unknown nesting style requested: #{config[:apply_nesting].inspect}!"
        end
      else
        sf.dump.merge('sfn_nested_stack' => !!sf.nested?)
      end
    else
      template = _from_json(File.read(config[:file]))
      run_callbacks_for(:template, :stack_name => arguments.first, :hash_stack => template)
      template
    end
  else
    raise ArgumentError.new 'Failed to locate template for processing!'
  end
end

#process_nested_stack_deep(sf, c_stack = nil) ⇒ Hash

Processes template using new deep workflow

Parameters:

  • sf (SparkleFormation) —

    stack

  • c_stack (Miasma::Models::Orchestration::Stack) (defaults to: nil) —

    existing stack

Returns:

  • (Hash) —

    dumped stack



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# File 'lib/sfn/command_module/template.rb', line 130

def process_nested_stack_deep(sf, c_stack=nil)
  sf.apply_nesting(:deep) do |stack_name, stack, resource|
    run_callbacks_for(:template, :stack_name => stack_name, :sparkle_stack => stack)
    stack_definition = stack.compile.dump!
    stack_resource = resource._dump
    unless(config[:print_only])
      result = Smash.new(
        'Parameters' => populate_parameters!(stack,
          :stack => c_stack ? c_stack.nested_stacks.detect{|s| s.data[:logical_id] == stack_name} : nil,
          :current_parameters => c_stack ? c_stack.template.fetch('Resources', stack_name, 'Properties', 'Parameters', Smash.new) : stack_resource['Properties'].fetch('Parameters', {})
        )
      )
      resource.properties.delete!(:stack)
      bucket = provider.connection.api_for(:storage).buckets.get(
        config[:nesting_bucket]
      )
      unless(bucket)
        raise "Failed to locate configured bucket for stack template storage (#{bucket})!"
      end
      file = bucket.files.build
      file.name = "#{name_args.first}_#{stack_name}.json"
      file.content_type = 'text/json'
      file.body = MultiJson.dump(Sfn::Utils::StackParameterScrubber.scrub!(stack_definition))
      file.save
      url = URI.parse(file.url)
      result.merge!(
        'TemplateURL' => "#{url.scheme}://#{url.host}#{url.path}"
      )
    else
      result = Smash.new(
        'TemplateURL' => "http://example.com/bucket/#{name_args.first}_#{stack_name}.json"
      )
    end
    result.each do |k,v|
      resource.properties.set!(k, v)
    end
  end
end

#process_nested_stack_shallow(sf, c_stack = nil) ⇒ Hash

Processes template using the original shallow workflow

Parameters:

  • sf (SparkleFormation) —

    stack formation

  • c_stack (Miasma::Models::Orchestration::Stack) (defaults to: nil) —

    existing stack

Returns:

  • (Hash) —

    dumped stack



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# File 'lib/sfn/command_module/template.rb', line 99

def process_nested_stack_shallow(sf, c_stack=nil)
  sf.apply_nesting(:shallow) do |stack_name, stack, resource|
    run_callbacks_for(:template, :stack_name => stack_name, :sparkle_stack => stack)
    stack_definition = stack.compile.dump!
    bucket = provider.connection.api_for(:storage).buckets.get(
      config[:nesting_bucket]
    )
    if(config[:print_only])
      template_url = "http://example.com/bucket/#{name_args.first}_#{stack_name}.json"
    else
      resource.properties.delete!(:stack)
      unless(bucket)
        raise "Failed to locate configured bucket for stack template storage (#{bucket})!"
      end
      file = bucket.files.build
      file.name = "#{name_args.first}_#{stack_name}.json"
      file.content_type = 'text/json'
      file.body = MultiJson.dump(Sfn::Utils::StackParameterScrubber.scrub!(stack_definition))
      file.save
      url = URI.parse(file.url)
      template_url = "#{url.scheme}://#{url.host}#{url.path}"
    end
    resource.properties.set!('TemplateURL', template_url)
  end
end

#prompt_for_template(prefix = nil) ⇒ String

Prompt user for template selection

Parameters:

  • prefix (String) (defaults to: nil) —

    prefix filter for names

Returns:

  • (String) —

    path to template



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# File 'lib/sfn/command_module/template.rb', line 220

def prompt_for_template(prefix=nil)
  if(prefix)
    collection_name = prefix.split('__').map do |c_name|
      c_name.split('_').map(&:capitalize).join(' ')
    end.join(' / ')
    ui.info "Viewing collection: #{ui.color(collection_name, :bold)}"
    template_names = sparkle_collection.templates.keys.find_all do |t_name|
      t_name.to_s.start_with?(prefix.to_s)
    end
  else
    template_names = sparkle_collection.templates.keys
  end
  collections = template_names.map do |t_name|
    t_name = t_name.to_s.sub(/^#{Regexp.escape(prefix.to_s)}/, '')
    if(t_name.include?('__'))
      c_name = t_name.split('__').first
      [[prefix, c_name].compact.join('') + '__', c_name]
    end
  end.compact.uniq(&:first)
  templates = template_names.map do |t_name|
    t_name = t_name.to_s.sub(/^#{Regexp.escape(prefix.to_s)}/, '')
    unless(t_name.include?('__'))
      [[prefix, t_name].compact.join(''), t_name]
    end
  end.compact
  if(collections.empty? && templates.empty?)
    ui.error 'Failed to locate any templates!'
    return nil
  end
  ui.info "Please select an entry#{ '(or collection to list)' unless collections.empty?}:"
  output = []
  idx = 1
  valid = {}
  unless(collections.empty?)
    output << ui.color('Collections:', :bold)
    collections.each do |full_name, part_name|
      valid[idx] = {:name => full_name, :type => :collection}
      output << [idx, part_name.split('_').map(&:capitalize).join(' ')]
      idx += 1
    end
  end
  unless(templates.empty?)
    output << ui.color('Templates:', :bold)
    templates.each do |full_name, part_name|
      valid[idx] = {:name => full_name, :type => :template}
      output << [idx, part_name.split('_').map(&:capitalize).join(' ')]
      idx += 1
    end
  end
  max = idx.to_s.length
  output.map! do |line|
    if(line.is_a?(Array))
      "  #{line.first}.#{' ' * (max - line.first.to_s.length)} #{line.last}"
    else
      line
    end
  end
  ui.puts "#{output.join("\n")}\n"
  response = nil
  until(valid[response])
    response = ui.ask_question('Enter selection').to_i
  end
  entry = valid[response]
  if(entry[:type] == :collection)
    prompt_for_template(entry[:name])
  else
    sparkle_collection.get(:template, entry[:name])[:path]
  end
end

#set_paths_and_discover_file! ⇒ TrueClass

Set SparkleFormation paths and locate tempate

Returns:

  • (TrueClass) 


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# File 'lib/sfn/command_module/template.rb', line 197

def set_paths_and_discover_file!
  if(config[:processing])
    if(!config[:file] && config[:file_path_prompt])
      config[:file] = prompt_for_template
    else
      config[:file] = sparkle_collection.get(:template, config[:file])[:path]
    end
  else
    if(config[:file])
      unless(File.exists?(config[:file]))
        raise Errno::ENOENT.new("No such file - #{config[:file]}")
      end
    else
      raise "Template processing is disabled. Path to serialized template via `--file` required!"
    end
  end
  true
end

#sparkle_collection ⇒ SparkleFormation::SparkleCollection

Returns:

  • (SparkleFormation::SparkleCollection) 


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# File 'lib/sfn/command_module/template.rb', line 26

def sparkle_collection
  memoize(:sparkle_collection) do
    collection = SparkleFormation::SparkleCollection.new
    begin
      root_pack = SparkleFormation::SparklePack.new(:root => config[:base_directory])
      collection.set_root(root_pack)
    rescue Errno::ENOENT
      ui.warn 'No local SparkleFormation files detected'
    end
    sparkle_packs.each do |pack|
      collection.add_sparkle(pack)
    end
    collection
  end
end

#sparkle_packs ⇒ Array<SparkleFormation::SparklePack>

Returns:

  • (Array<SparkleFormation::SparklePack>) 


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# File 'lib/sfn/command_module/template.rb', line 17

def sparkle_packs
  memoize(:sparkle_packs) do
    config.fetch(:sparkle_pack, []).map do |sparkle_name|
      SparkleFormation::Sparkle.new(:name => sparkle_name)
    end
  end
end

#translate_template(template) ⇒ Hash

Apply template translation

Parameters:

  • template (Hash)

Returns:

  • (Hash) 


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# File 'lib/sfn/command_module/template.rb', line 173

def translate_template(template)
  if(klass_name = config[:translate])
    klass = SparkleFormation::Translation.const_get(camel(klass_name))
    args = {
      :parameters => config.fetch(:options, :parameters, Smash.new)
    }
    if(chunk_size = config[:translate_chunk_size])
      args.merge!(
        :options => {
          :serialization_chunk_size => chunk_size
        }
      )
    end
    translator = klass.new(template, args)
    translator.translate!
    template = translator.translated
    ui.info "#{ui.color('Translation applied:', :bold)} #{ui.color(klass_name, :yellow)}"
  end
  template
end