I'm sending an email using nodemailer and in case a send is faild, I wanna use a different host in a retry.
I tried:
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');
}
});
}
It works but it feels a bit cumbersome.
Is there a better way to implement this feature?
How about something like this (updated per suggestions from Bergi)?
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))
}
}
(Please don't use this original verion, for the reason's Bergi pointed out)
// 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');
}
})
})
}It could easily be extended to handle something like:
const hosts = [{host: host1, tries: 3}, {host: host2, tries: 1}, {host: host3, tries: 5}]
sendMail (options, hosts)
so that it would try the first host three times, then a second one once, then a third one five times before giving up.