Class: Humidifier::Stack

Inherits:
Object
  • Object
show all
Defined in:
lib/humidifier/stack.rb

Overview

Represents a CFN stack

Constant Summary collapse

STATIC_RESOURCES =

Single settings on the stack

Utils.underscored(%w[AWSTemplateFormatVersion Description Metadata])
ENUMERABLE_RESOURCES =

Lists of objects linked to the stack

Utils.underscored(%w[Conditions Mappings Outputs Parameters Resources])

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Stack

Returns a new instance of Stack.



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# File 'lib/humidifier/stack.rb', line 15

def initialize(opts = {})
  @name = opts[:name]
  @id = opts[:id]
  @default_identifier = self.class.next_default_identifier

  ENUMERABLE_RESOURCES.each_value do |property|
    instance_variable_set(:"@#{property}", opts.fetch(property, {}))
  end

  STATIC_RESOURCES.each_value do |property|
    instance_variable_set(:"@#{property}", opts[property])
  end
end

Instance Attribute Details

#id ⇒ Object

Returns the value of attribute id.



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# File 'lib/humidifier/stack.rb', line 12

def id
  @id
end

Class Method Details

.next_default_identifier ⇒ Object

Increment the default identifier



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# File 'lib/humidifier/stack.rb', line 66

def self.next_default_identifier
  @count ||= 0
  @count += 1
  "humidifier-stack-template-#{@count}"
end

Instance Method Details

#add(name, resource, attributes = {}) ⇒ Object

Add a resource to the stack and optionally set its attributes



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# File 'lib/humidifier/stack.rb', line 30

def add(name, resource, attributes = {})
  resources[name] = resource
  resource.update_attributes(attributes) if attributes.any?
  resource
end

#identifier ⇒ Object

The identifier used by the shim to find the stack in CFN, prefers id to name



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# File 'lib/humidifier/stack.rb', line 38

def identifier
  id || name || default_identifier
end

#to_cf(serializer = :json) ⇒ Object

A string representation of the stack that’s valid for CFN



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# File 'lib/humidifier/stack.rb', line 43

def to_cf(serializer = :json)
  resources = static_resources.merge(enumerable_resources)

  case serializer
  when :json then JSON.pretty_generate(resources)
  when :yaml then YAML.dump(resources)
  end
end