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

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

Instance Method Summary collapse

Instance Method Details

#dump_stack_for_storage(template) ⇒ Hash

Remove internally used ‘Stack` property from Stack resources and and generate compiled Hash



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# File 'lib/sfn/command_module/template.rb', line 362

def dump_stack_for_storage(template)
  nested_stacks = template.nested_stacks(:with_resource, :with_name).map do |nested_stack, nested_resource, nested_name|
    [nested_name, nested_resource, nested_resource.properties.delete!(:stack)]
  end
  stack_definition = template.dump
  if(config[:plan])
    nested_stacks.each do |nested_name, nested_resource, nested_data|
      nested_resource.properties.set!(:stack, nested_data)
    end
  end
  stack_definition
end

#extract_current_nested_template_parameters(template, stack_name, c_stack = nil) ⇒ Hash

Extract currently defined parameters for nested template



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# File 'lib/sfn/command_module/template.rb', line 324

def extract_current_nested_template_parameters(template, stack_name, c_stack=nil)
  if(template.parent)
    current_parameters = template.parent.compile.resources.set!(stack_name).properties.parameters
    current_parameters.nil? ? Smash.new : current_parameters._dump
  else
    Smash.new
  end
end

#format_nested_stack_results(provider, results) ⇒ Hash

Update the nested stack information for specific provider



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# File 'lib/sfn/command_module/template.rb', line 394

def format_nested_stack_results(provider, results)
  case provider
  when :aws
    if(results[:parameters])
      results['Parameters'] = results.delete(:parameters)
    end
    if(results[:url])
      url = URI.parse(results.delete(:url))
      results['TemplateURL'] = "#{url.scheme}://#{url.host}#{url.path}"
    end
    results
  when :heat, :rackspace
    results[:template] = results.delete(:url)
    results
  when :azure
    if(results[:parameters])
      results[:parameters] = Smash[
        results[:parameters].map do |key, value|
          [key,
            value.is_a?(Hash) ? value : Smash.new(:value => value)]
        end
      ]
    end
    if(results[:url])
      results[:templateLink] = Smash.new(
        :uri => results.delete(:url),
        :contentVersion => '1.0.0.0'
      )
    end
    results[:mode] = 'Incremental'
    results
  else
    raise "Unknown stack provider value given! `#{provider}`"
  end
end

#load_template_file(*args) ⇒ Hash

Load the template file



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# File 'lib/sfn/command_module/template.rb', line 154

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])
      compile_state = config.fetch(:compile_parameters, Smash.new)
      compile_state.keys.each do |cs_key|
        if(cs_key.to_s.start_with?(arguments.first.to_s))
          cli_provided = compile_state.delete(cs_key.to_s.sub("#{arguments.first.to_s}__", ''))
          compile_state[cs_key].deep_merge!(cli_provided)
        end
      end
      ui.debug "Merged compile parameters - #{compile_state}"
      sf = SparkleFormation.compile(config[:file], :sparkle)
      if(name_args.first)
        sf.name = name_args.first
      end
      sf.compile_time_parameter_setter do |formation|
        f_name = formation.root_path.map(&:name).map(&:to_s)
        pathed_name = f_name.join(' > ')
        f_name = f_name.join('__')
        if(formation.root? && compile_state[f_name].nil?)
          current_state = compile_state
        else
          current_state = compile_state.fetch(f_name, Smash.new)
        end
        if(formation.compile_state)
          current_state = current_state.merge(formation.compile_state)
        end
        unless(formation.parameters.empty?)
          ui.info "#{ui.color('Compile time parameters:', :bold)} - template: #{ui.color(pathed_name, :green, :bold)}" unless config[:print_only]
          formation.parameters.each do |k,v|
            current_state[k] = request_compile_parameter(k, v, current_state[k], !!formation.parent)
          end
          formation.compile_state = current_state
        end
      end
      sf.sparkle.apply sparkle_collection
      custom_stack_types.each do |s_type|
        unless(sf.stack_resource_types.include?(s_type))
          sf.stack_resource_types.push(s_type)
        end
      end
      run_callbacks_for(:template, :stack_name => arguments.first, :sparkle_stack => sf)
      if(sf.nested? && config[:apply_nesting])
        validate_nesting_bucket!
        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)
        when :none
          sf
        else
          raise ArgumentError.new "Unknown nesting style requested: #{config[:apply_nesting].inspect}!"
        end
        sf
      else
        sf
      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) ⇒ SparkleFormation::SparkleStruct

Processes template using new deep workflow



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# File 'lib/sfn/command_module/template.rb', line 280

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_resource = resource._dump
    current_stack = c_stack ? c_stack.nested_stacks.detect{|s| s.data[:logical_id] == stack_name} : nil
    current_parameters = extract_current_nested_template_parameters(stack, stack_name, current_stack)
    if(current_stack && current_stack.data[:parent_stack])
      current_parameters.merge!(
        current_stack.data[:parent_stack].template.fetch(
          'Resources', stack_name, 'Properties', 'Parameters', current_stack.data[:parent_stack].template.fetch(
            'resources', stack_name, 'properties', 'parameters', Smash.new
          )
        )
      )
    end
    full_stack_name = [
      config[:nesting_prefix],
      stack.root_path.map(&:name).map(&:to_s).join('_')
    ].compact.join('/')
    unless(config[:print_only])
      result = Smash.new(
        :parameters => populate_parameters!(stack,
          :stack => current_stack,
          :current_parameters => current_parameters
        )
      )
      store_template(full_stack_name, stack, result)
    else
      result = Smash.new(
        :url => "http://example.com/bucket/#{full_stack_name}.json"
      )
    end
    format_nested_stack_results(resource._self.provider, 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



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# File 'lib/sfn/command_module/template.rb', line 250

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)
    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
      stack_definition = dump_stack_for_storage(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



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# File 'lib/sfn/command_module/template.rb', line 487

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.fetch(provider.connection.provider, {}).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

#request_compile_parameter(p_name, p_config, cur_val, nested = false) ⇒ Object

Request compile time parameter value

Options Hash (p_config):

  • :type (String, Symbol)
  • :default (String, Symbol)
  • :description (String, Symbol)
  • :multiple (String, Symbol) 


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

def request_compile_parameter(p_name, p_config, cur_val, nested=false)
  result = nil
  attempts = 0
  unless(cur_val || p_config[:default].nil?)
    cur_val = p_config[:default]
  end
  if(cur_val.is_a?(Array))
    cur_val = cur_val.map(&:to_s).join(',')
  end
  until(result && (!result.respond_to?(:empty?) || !result.empty?))
    attempts += 1
    if(config[:interactive_parameters] && (!nested || !p_config.key?(:prompt_when_nested) || p_config[:prompt_when_nested] == true))
      result = ui.ask_question(
        p_name.to_s.split('_').map(&:capitalize).join,
        :default => cur_val.to_s.empty? ? nil : cur_val.to_s
      )
    else
      result = cur_val.to_s
    end
    case p_config.fetch(:type, 'string').to_s.downcase.to_sym
    when :string
      if(p_config[:multiple])
        result = result.split(',').map(&:strip)
      end
    when :number
      if(p_config[:multiple])
        result = result.split(',').map(&:strip)
        new_result = result.map do |item|
          new_item = item.to_i
          new_item if new_item.to_s == item
        end
        result = new_result.size == result.size ? new_result : []
      else
        new_result = result.to_i
        result = new_result.to_s == result ? new_result : nil
      end
    else
      raise ArgumentError.new "Unknown compile time parameter type provided: `#{p_config[:type].inspect}` (Parameter: #{p_name})"
    end
    valid = validate_parameter(result, p_config.to_smash)
    unless(valid == true)
      result = nil
      valid.each do |invalid_msg|
        ui.error invalid_msg.last
      end
    end
    if(result.nil? || (result.respond_to?(:empty?) && result.empty?))
      if(attempts > MAX_PARAMETER_ATTEMPTS)
        ui.fatal "Failed to receive allowed parameter! (Parameter: #{p_name})"
        exit 1
      end
    end
  end
  result
end

#scrub_template(template) ⇒ Hash

Scrub sparkle/sfn customizations from the stack resource data



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# File 'lib/sfn/command_module/template.rb', line 379

def scrub_template(template)
  template = Sfn::Utils::StackParameterScrubber.scrub!(template)
  (template['Resources'] || {}).each do |r_name, r_content|
    if(valid_stack_types.include?(r_content['Type']))
      result = (r_content['Properties'] || {}).delete('Stack')
    end
  end
  template
end

#set_paths_and_discover_file! ⇒ TrueClass

Set SparkleFormation paths and locate tempate



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# File 'lib/sfn/command_module/template.rb', line 458

def set_paths_and_discover_file!
  if(config[:processing])
    if(!config[:file] && config[:file_path_prompt])
      config[:file] = prompt_for_template
    else
      file_lookup_path = File.expand_path(config[:file])
      unless(File.exists?(file_lookup_path))
        file_lookup_path = config[:file]
      end
      config[:file] = sparkle_collection.get(
        :template, file_lookup_path
      )[: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 



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# File 'lib/sfn/command_module/template.rb', line 123

def sparkle_collection
  memoize(:sparkle_collection) do
    collection = SparkleFormation::SparkleCollection.new(
      :provider => config.get(:credentials, :provider)
    )
    begin
      if(config[:base_directory])
        root_pack = SparkleFormation::SparklePack.new(
          :root => config[:base_directory],
          :provider => config.get(:credentials, :provider)
        )
      else
        root_pack = SparkleFormation::SparklePack.new(
          :provider => config.get(:credentials, :provider)
        )
      end
      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> 



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# File 'lib/sfn/command_module/template.rb', line 103

def sparkle_packs
  memoize(:sparkle_packs) do
    [config.fetch(:sparkle_pack, [])].flatten.compact.map do |sparkle_name|
      begin
        require sparkle_name
      rescue LoadError
        ui.fatal "Failed to locate sparkle pack `#{sparkle_name}` for loading!"
        raise
      end
      begin
        SparkleFormation::Sparkle.new(:name => sparkle_name)
      rescue ArgumentError
        ui.fatal "Failed to properly setup sparkle pack `#{sparkle_name}`. Check implementation."
        raise
      end
    end
  end
end

#store_template(full_stack_name, template, result) ⇒ Hash

Store template in remote bucket and update given result hash



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# File 'lib/sfn/command_module/template.rb', line 339

def store_template(full_stack_name, template, result)
  stack_definition = template.is_a?(SparkleFormation) ? dump_stack_for_storage(template) : template
  bucket = provider.connection.api_for(:storage).buckets.get(
    config[:nesting_bucket]
  )
  unless(bucket)
    raise "Failed to locate configured bucket for stack template storage (#{config[:nesting_bucket]})!"
  end
  file = bucket.files.build
  file.name = "#{full_stack_name}.json"
  file.content_type = 'text/json'
  file.body = MultiJson.dump(parameter_scrub!(stack_definition))
  file.save
  result.merge!(
    :url => file.url
  )
end

#template_content(thing, scrub = false) ⇒ Hash

Extract template content based on type



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# File 'lib/sfn/command_module/template.rb', line 23

def template_content(thing, scrub=false)
  if(thing.is_a?(SparkleFormation))
    if(scrub)
      dump_stack_for_storage(thing)
    else
      config[:sparkle_dump] ? thing.sparkle_dump : thing.dump
    end
  else
    thing
  end
end

#translate_template(template) ⇒ Hash

Apply template translation



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# File 'lib/sfn/command_module/template.rb', line 434

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

#validate_nesting_bucket! ⇒ Object

Force user friendly error if nesting bucket is not set within configuration



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# File 'lib/sfn/command_module/template.rb', line 238

def validate_nesting_bucket!
  if(config[:nesting_bucket].to_s.empty?)
    ui.error 'Missing required configuration value for `nesting_bucket`. Cannot generated nested templates!'
    raise ArgumentError.new 'Required configuration value for `nesting_bucket` not provided.'
  end
end