Class: Stacker::Stack::Template

Inherits:
Component show all
Extended by:
Memoist
Defined in:
lib/stacker/stack/template.rb

Defined Under Namespace

Classes: JSONFormatter

Constant Summary collapse

FORMAT_VERSION = 
'2010-09-09'

Instance Attribute Summary

Attributes inherited from Component

#stack

Instance Method Summary collapse

Methods inherited from Component

#initialize

Constructor Details

This class inherits a constructor from Stacker::Stack::Component

Instance Method Details

#diff(*args) ⇒ Object 



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# File 'lib/stacker/stack/template.rb', line 44

def diff *args
  Differ.json_diff local, remote, *args
end

#dump ⇒ Object 



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# File 'lib/stacker/stack/template.rb', line 53

def dump
  write remote
end

#exists? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/stacker/stack/template.rb', line 16

def exists?
  File.exists? path
end

#local ⇒ Object 



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# File 'lib/stacker/stack/template.rb', line 20

def local
  @local ||= begin
    if exists?
      template = JSON.parse File.read path
      template['AWSTemplateFormatVersion'] ||= FORMAT_VERSION
      template
    else
      {}
    end
  end
rescue JSON::ParserError
  raise TemplateSyntaxError.new path
end

#remote ⇒ Object 



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# File 'lib/stacker/stack/template.rb', line 34

def remote
  @remote ||= JSON.parse client.template
rescue AWS::CloudFormation::Errors::ValidationError => err
  if err.message =~ /does not exist/
    raise DoesNotExistError.new err.message
  else
    raise Error.new err.message
  end
end

#write(value = local) ⇒ Object 



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# File 'lib/stacker/stack/template.rb', line 49

def write value = local
  File.write path, JSONFormatter.format(value)
end