application controller arround filter to log

application_controller.rb

  around_filter do |controller, action|
    @start_time = Time.now
    set_trace_func proc { |event, file, line, id, binding, classname|
      if (@file != file && @line != line) 
        @file, @line = file, line
        if (%w(call c-call).include? event)
          file = @file[(Rails.root.to_s.size+1)..-1]
          if @file[0...(Rails.root.to_s.size)] == Rails.root.to_s && !(file =~ /vendor\/plugins\/newrelic_rpm/)
            @logger ||= Logger.new(File.join(Rails.root,'tmp/trace'))
            args = []
            args << controller.controller_name.to_s
            args << controller.action_name.to_s
            args << @start_time.to_i
            args << (Time.now - @start_time) * 1000.0
            args << File.expand_path(file).sub(Rails.root.to_s,'').to_s+':'+line.to_s
            args << classname.to_s
            args << event.to_s
            @logger.info(args.join(" , "))
          end
        end
      end
    }
    action.call
    set_trace_func nil
    true
  end