从不同主机发送电子邮件的重试机制

Question

我正在使用 nodemailer 发送电子邮件，如果发送失败，我想使用其他主机重试。

我试过了：

let tries = 0;
let maxTries = 2;
  const sendEmail = async () => {
    tries += 1;
    
    if (tries === maxTries) return;

    const transporter = nodemailer.createTransport({
        host: tries === 1 ? host1 : host2,
        port: port,
        secure: false
    });

    // mailOptions object here....

    await transporter.sendMail(mailOptions, (err, info) => {
        if (err) {
            return sendEmail();
          } else {
            console.log('Email Sent Successfuly');
        }
    });
}

可以用但是感觉有点麻烦

有没有更好的方法来实现这个功能？

Answer 1

这样的事情怎么样（根据 Bergi 的建议更新）？

const sendEmail = async (mailOptions, hosts = [host1, host2]) => {
  if (hosts .length == 0) {
    return Promise .reject ('all hosts failed')
  }
  // configure transporter  
  try { 
    const info = await transporter .sendMail (mailOptions); 
    return 'Email sent successfully'; 
  } catch (err) { 
    return sendEmail (option, hosts .slice (1)) 
  }
}

（请不要使用这个原始版本，因为 Bergi 指出的原因）

// DO NOT USE
const sendEmail = async (options, hosts = [host1, host2]) => {
  if (hosts .length == 0) {
    return Promise .reject ('all hosts failed')
  }
  // configure transporter
  return new Promise ((resolve, reject) => {
    transporter .sendMail (mailOptions, (err, info) => {
      if (err) {
        return sendEmail (option, hosts .slice (1))
      } else {
        resolve ('Email Sent Successfuly');
      }
    })
  })
}

它可以很容易地扩展以处理类似的事情：

const hosts = [{host: host1, tries: 3}, {host: host2, tries: 1}, {host: host3, tries: 5}]
sendMail (options, hosts)

这样它会尝试第一个主机三次，然后第二个主机一次，然后第三个主机五次，然后放弃。

从不同主机发送电子邮件的重试机制

Retry mechanism to send an email from different host

javascript

recursion

nodemailer