gistfile1.rb

    def find_memcached_nodes
      find_nodes_with_role('enmasse_online_memcached', node.chef_environment)
    end

    def find_nodes_with_role(role, environment)
      return [node] if node.chef_environment == 'development'
      results = search(:node, "role:#{role} AND chef_environment:#{environment}")
      if node.run_list.roles.include?(role)
        results << node
      end
      if results.length == 0
        Chef::Log.error("No node with role [#{role}] in the [#{environment}] environment was found.")
      end
      results.uniq
    end

memcached_nodes = find_memcached_nodes.collect do |mem_node|
  memcached_listen = mem_node.enmasse_online.memcached.listen rescue node.enmasse_online.memcached.listen
  memcached_port = mem_node.enmasse_online.memcached.port rescue node.enmasse_online.memcached.port
  "#{memcached_listen}:#{memcached_port}"
end