Class: Bora::Resolver::Cfn

Inherits:
Object
  • Object
show all
Defined in:
lib/bora/resolver/cfn.rb

Constant Summary collapse

StackDoesNotExist = 
Class.new(StandardError)
ValueNotFound = 
Class.new(StandardError)
InvalidParameter = 
Class.new(StandardError)

Instance Method Summary collapse

Constructor Details

#initialize(stack) ⇒ Cfn

Returns a new instance of Cfn.



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# File 'lib/bora/resolver/cfn.rb', line 10

def initialize(stack)
  @stack = stack
  @stack_cache = {}
end

Instance Method Details

#resolve(uri) ⇒ Object 



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# File 'lib/bora/resolver/cfn.rb', line 15

def resolve(uri)
  stack_name = uri.host
  section, name = uri.path.split('/').reject(&:empty?)
  if !stack_name || !section || !name || section != 'outputs'
    raise InvalidParameter, "Invalid parameter substitution: #{uri}"
  end

  stack_name, uri_region = stack_name.split('.')
  region = uri_region || @stack.region

  param_stack = @stack_cache[stack_name] || Bora::Cfn::Stack.new(stack_name, region)
  unless param_stack.exists?
    raise StackDoesNotExist, "Output #{name} not found in stack #{stack_name} as the stack does not exist"
  end

  outputs = param_stack.outputs || []
  matching_output = outputs.find { |output| output.key == name }
  unless matching_output
    raise ValueNotFound, "Output #{name} not found in stack #{stack_name}"
  end

  matching_output.value
end