class RubyProf::FlameGraphPrinter

def build_flame_data(call_tree, depth = 0)
  node = {
    name: call_tree.target.full_name,
    value: call_tree.total_time,
    self_value: call_tree.self_time,
    called: call_tree.called,
    children: []
  }
  if @max_depth.nil? || depth < @max_depth
    call_tree.children.each do |child|
      node[:children] << build_flame_data(child, depth + 1)
    end
  end
  node
end