How to use

req

function

in

Request

// 在 request 分配的 socket 上挂载 _lastBytesWritten 属性，记录该 socket 已经发送的字节数
  var markLastBytesWritten = function() {
    try {
      Object.defineProperty(sender.req.connection, '_lastBytesWritten', {
        enumerable: true,
        configurable: true,
        writable: true,
        value: sender.req.connection.bytesWritten
      });
    } catch(e) {
    }
  }

sender.on('drain', function () {
      var time1 = Date.now();
      var loaded = 0;
      try {
        // 已经上传的字节数 = socket当前累计发送的字节数 - 头部长度 - socket以前发送的字节数
        loaded = sender.req.connection.bytesWritten - sender.req._header.length - (sender.req.connection._lastBytesWritten || 0);
      } catch (e) {
      }
      var total = contentLength;
      var speed = parseInt((loaded - size0) / ((time1 - time0) / 1000) * 100) / 100;
      var percent = total ? (parseInt(loaded / total * 100) / 100) : 0;
      time0 = time1;
      size0 = loaded;
      params.onProgress({
        loaded: loaded,
        total: total,
        speed: speed,
        percent: percent,
      });
    });