Puppet parser function to return an array of AWS ElastiCache cluster nodes

ecGetMembers.rb

require 'rubygems'
require 'fog'

module Puppet::Parser::Functions
  newfunction(:ecGetMembers, :type => :rvalue) do |args|

    raise(Puppet::ParseError, "ecGetMembers(): wrong number of arguments(#{args.length}; must be 1)") if args.size != 1

    params = {}

    params[:ecc] = args[0]

    Fog.credentials_path = '/etc/puppet/fog_cred'

    @ecc = Fog::AWS::Elasticache.new()

    @ec = @ecc.clusters.get(params[:ecc])

    nodes = Array.new
    #check to see if the cluster is registered and ready
    if @ec and @ec.ready?()
      @ec.nodes.each { |n| nodes << "#{n['Address']}:#{n['Port']}" }
    end
    nodes
  end
end