Class: Hygroscope::Template

Inherits:
Object
  • Object
show all
Defined in:
lib/hygroscope/template.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ Template

Returns a new instance of Template.



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# File 'lib/hygroscope/template.rb', line 11

def initialize(path)
  @path = path
end

Instance Attribute Details

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/hygroscope/template.rb', line 9

def path
  @path
end

Instance Method Details

#compress ⇒ Object 



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# File 'lib/hygroscope/template.rb', line 35

def compress
  JSON.parse(process).to_json
end

#parameters ⇒ Object 



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# File 'lib/hygroscope/template.rb', line 39

def parameters
  template = JSON.parse(process)
  template['Parameters'] || []
end

#process ⇒ Object

Process a set of files with cfoo and return JSON



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# File 'lib/hygroscope/template.rb', line 16

def process
  return @template if @template

  out = StringIO.new
  err = StringIO.new

  files = Dir.glob(File.join(@path, '*.{yml,yaml}'))
  cfoo = Cfoo::Factory.new(out, err).cfoo

  Dir.chdir('/') do
    cfoo.process(*files)
  end

  fail(TemplateYamlParseError, err.string) unless err.string.empty?

  @template = out.string
  @template
end

#process_to_file ⇒ Object

Process a set of files with cfoo and write JSON to a temporary file



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# File 'lib/hygroscope/template.rb', line 45

def process_to_file
  file = Tempfile.new(['hygroscope-', '.json'])
  file.write(process)
  file.close

  at_exit { file.unlink }

  file
end

#validate ⇒ Object 



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# File 'lib/hygroscope/template.rb', line 55

def validate
  # Parsing the template to JSON and then re-outputting it is a form of
  # compression (removing all extra spaces) to keep within the 50KB limit
  # for CloudFormation templates.
  template = compress

  begin
    stack = Hygroscope::Stack.new('template-validator')
    stack.client.validate_template(template_body: template)
  rescue => e
    raise e
  end
end