Class: Moonshot::StackTemplate

Inherits:
Object
  • Object
show all
Defined in:
lib/moonshot/stack_template.rb

Overview

A StackTemplate loads the JSON template from disk and stores information about it.

Defined Under Namespace

Classes: Parameter

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename, log:) ⇒ StackTemplate

Returns a new instance of StackTemplate.



15
16
17
18
19
20
21
22
23
24
25
26
 
# File 'lib/moonshot/stack_template.rb', line 15

def initialize(filename, log:)
  @log = log

  unless File.exist?(filename)
    @log.error("Could not find CloudFormation template at #{filename}")
    raise
  end

  # The maximum TemplateBody length is 51,200 bytes, so we remove
  # formatting white space.
  @body = JSON.parse(File.read(filename)).to_json
end

Instance Attribute Details

#body ⇒ Object (readonly)

Returns the value of attribute body.



13
14
15
 
# File 'lib/moonshot/stack_template.rb', line 13

def body
  @body
end

Instance Method Details

#parameters ⇒ Object 



28
29
30
31
32
 
# File 'lib/moonshot/stack_template.rb', line 28

def parameters
  JSON.parse(@body).fetch('Parameters', {}).map do |k, v|
    Parameter.new(k, v['Default'])
  end
end

#resource_names ⇒ Object

Return a list of defined resource names in the template.



35
36
37
 
# File 'lib/moonshot/stack_template.rb', line 35

def resource_names
  JSON.parse(@body).fetch('Resources', {}).keys
end