Part of my engine.js

engine.js

  function onTrade(trade, is_preroll, cb) {
    if (s.period && trade.time < s.period.time) {
      return
    }
    var day = (new Date(trade.time)).getDate()
    if (s.last_day && day !== s.last_day) {
      s.day_count++
    }
    s.last_day = day
    if (!s.period) {
      initBuffer(trade)
    }
    s.in_preroll = is_preroll || (so.start && trade.time < so.start)
    if (!s.period.last_try_trade && !s.in_preroll) {
      s.period.last_try_trade = now()
    }
    if(trade.time > s.period.close_time || 
      (!s.in_preroll && so.mode != "sim" && moment.duration(moment(now()).diff(s.period.last_try_trade)).asMinutes() >= 1)){
      var period_id = tb(trade.time).resize(so.period_length).toString()
      s.period.last_try_trade = now()
      s.strategy.onPeriod.call(s.ctx, s, function () {
        writeReport()
        s.acted_on_stop = false
        if (!s.in_preroll && !so.manual) {
          executeStop(true)
          if (s.signal) {
            executeSignal(s.signal)
          }
        }
        s.action = null
        s.signal = null
        if (trade.time > s.period.close_time) {
          s.lookback.unshift(s.period)
          initBuffer(trade)
        }
        withOnPeriod(trade, period_id, cb)
      })
    }
    else {
      withOnPeriod(trade, period_id, cb)
    }
  }