qiwi/qorsproxy

export default class Stats {
  constructor () {
    this.traffic = 0
    this.count = 0
    this.error = 0 // TODO handle
  }

  incrementTraffic (length) {
    this.traffic += length | 0
  }

  incrementCount () {
    this.count += 1

    return this.count
  }

  report () {
    return {
      count: this.count,
      traffic: this.traffic
      // TODO add average response time
    }
  }

  req (req, res, next) {
    this.incrementCount()
    next()
  }

  res (req, res, next) {
    res.piped && this.incrementTraffic(res.piped.body.length)
    next()
  }
}