Cloud Functions for Firebase - Send email onWrite

Question

I m trying to send a test email to my email when anything is written in /emails but the email never gets sent and the function logs are empty.

exports.sendTestEmail = functions.database.ref('/emails')
  .onWrite(event => {
    return sendTestEmail('[email protected]');
  })
// [END onWrite]

// Sends a welcome email to the given user.
function sendTestEmail(email) {
  const mailOptions = {
    from: `${APP_NAME} <[email protected]>`,
    to: email
  };
  // The user subscribed to the newsletter.
  mailOptions.subject = `Welcome to ${APP_NAME}!`;
  mailOptions.text = `Hey there! Welcome to ${APP_NAME}. I hope you will enjoy our service.`;
  return mailTransport.sendMail(mailOptions).then(() => {
    console.log('New welcome email sent to:', email);
  });

}

Edit ***

The above code works. I was trying to trigger the function on emails while the correct name was email.

Are you using gmail as your smtp service? If you are, you may need to use an app password instead of your personal password due to Google's security. Here's a way to do that support.google.com/accounts/answer/185833?hl=en — Tobi Akerele
yes I am. the problem is that I send emails using the same format when users create accounts. and that works. — Ciprian
Try catching errors on the send: mailTransport.sendMail(mailOptions).then(...).catch(error => { console.error('Error sending:', error); }); — Bob Snyder
You say "the function logs are empty". You are seeing the entry that says Function execution started, right? — Bob Snyder
Also ensure that the value written to /emails is a change from the previous value. I haven't tested all the client SDKs, but with Android, performing a write to a location that does not change the value will not cause the onWrite() event to fire. — Bob Snyder

Ciprian Ciprian · Accepted Answer · 2017-06-12T18:06:03

Correct way of sending an email using Firebase Cloud Functions!

exports.sendTestEmail = functions.database.ref('/emails')
  .onWrite(event => {
    return sendTestEmail('[email protected]');
  })
// [END onWrite]

// Sends a welcome email to the given user.
function sendTestEmail(email) {
  const mailOptions = {
    from: `${APP_NAME} <[email protected]>`,
    to: email
  };
  // The user subscribed to the newsletter.
  mailOptions.subject = `Welcome to ${APP_NAME}!`;
  mailOptions.text = `Hey there! Welcome to ${APP_NAME}. I hope you will enjoy our service.`;
  return mailTransport.sendMail(mailOptions).then(() => {
    console.log('New welcome email sent to:', email);
  });

}

Cloud Functions for Firebase - Send email onWrite

1 Answers