javascript - 发送多封电子邮件时显示进度

Question

我正在从我的 node.js 服务器发送多封电子邮件，我想在前端显示已发送多少邮件的进度。

我编写了仅在发送每封电子邮件后才发送响应的代码，但是我需要通知前端有关进度。据我所知，我无法在单个 http 请求上发送多个响应，所以我有点迷失在这里。

我的电子邮件发送请求处理程序：

 const send = async (req, res) => {
    //parsing request body
    const {user, recievers, subject, text} = req.body;

    //Getting sender credentials from db
    const user = await UserSettings.findOne({ user }, 'MAIL');

    //creating nodemailer transporter
    const transporter = nodemailer.createTransport({
      service: user.MAIL.SERVICE,
      auth: {
        user: user.MAIL.USER,
        pass: user.MAIL.PASSWORD,
      },
    });

    //sending email to every reciever
    recievers.forEach(reciever=> {
      const mailOptions = {
        from: user.MAIL.USER,
        to: reciever,
        subject,
        text
      };

      return transporter.sendMail(mailOptions, (error, info) => {
        if (!error) {
          console.log(`Email sent: ${info.response}`);
        } else {
          console.log(error);
        }
      });
    });

    return res.sendStatus(204);
};

标签： javascriptnode.jshttpnodemailer