Question

我在同一个index.js文件中创建了几个函数，即sendEmail，sendEmailByDbStatusChange和sendEmailConfirmation。

sendEmail - 通过HTTP / API调用

sendEmailByDbStatusChange - 在值更改时侦听DB，但操作是硬编码的

sendEmailConfirmation - 在值更改时列出到DB，该操作受快照影响。

以下是我的代码：

const functions = require('firebase-functions');
const nodemailer = require('nodemailer');
const gmailEmail = functions.config().gmail.email;
const gmailPassword = functions.config().gmail.password;
const mailTransport = nodemailer.createTransport({
  service: 'gmail',
  auth: {
    user: gmailEmail,
    pass: gmailPassword,
  },
});

// Sends an email confirmation when a user changes his mailing list subscription.
exports.sendEmail = functions.https.onRequest((req, res) => {
  if (req.body.subject === undefined || req.body.recipient === undefined) {
    // This is an error case, as "message" is required.
    //res.status(400).send('subject/body/recipient is missing!');
    return false
  } else {
    const mailSubject = req.body.subject;
    const mailHtmlBody = req.body.htmlBody;
    const mailRecipient = req.body.recipient;



    const mailOptions = {
      from: '"Food Ninja." <foodninjaapp@gmail.com>',
      to: mailRecipient,
      subject: mailSubject,
      html: mailHtmlBody
    };

    //res.status(200).send('Success: ' + mailSubject + ' to ' + mailRecipient);

    return mailTransport.sendMail(mailOptions)
      .then(() => {
        console.log(`${mailSubject}subscription confirmation email sent to: `, mailRecipient)
        return res.status(200).send('Success: ' + mailSubject + ' to ' + mailRecipient)
      })
      .catch((error) => console.error('There was an error while sending the email:', error));
  }
});

exports.sendEmailByDbStatusChange = functions.database.ref('/users/{uid}').onWrite((event) => {
  //const snapshot = event.data;
  //const val = snapshot.val();

  //if (!snapshot.changed('subscribedToMailingList')) {
  //  return null;
  //}

  const mailSubject = 'Sending email with Cloud Function - by DB onWrite Trigger';
  const mailHtmlBody = '<h1>Hello Jerry</h1><p>If you receiving this means that you have successfully deployed a customized firebase function</p><p>Be Happy!<br><br>Food Ninja Team</p>';
  const mailRecipient = 'admin@phd.com.my';

  const mailOptions = {
    from: '"Food Ninja." <foodninjaapp@gmail.com>',
    to: mailRecipient,
    subject: mailSubject,
    html: mailHtmlBody
  };

  //const subscribed = val.subscribedToMailingList;

  // Building Email message.
  //mailOptions.subject = subscribed ? 'Thanks and Welcome!' : 'Sad to see you go :`(';
  //mailOptions.text = subscribed ? 'Thanks you for subscribing to our newsletter. You will receive our next weekly newsletter.' : 'I hereby confirm that I will stop sending you the newsletter.';

  return mailTransport.sendMail(mailOptions)
    .then(() =>
      console.log(`${mailSubject}subscription confirmation email sent to: `, mailRecipient)
      //return res.status(200).send('Success: ' + mailSubject + ' to ' + mailRecipient)
    )
    .catch((error) => console.error('There was an error while sending the email:', error));
});

exports.sendEmailConfirmation = functions.database.ref('/users/{uid}').onWrite((event2) => {
  console.log(event2)
  console.log(event2.val())
  console.log(event2.val().data)
  console.log(event2.data)
  console.log(event2.data.val())
  const snapshot = event2.data;
  console.log(snapshot)
  const val = snapshot.val();
  console.log(val)

  if (!snapshot.changed('subscribedToMailingList')) {
    return null;
  }

  const mailOptions = {
    from: '"Spammy Corp." <noreply@firebase.com>',
    to: val.email,
  };

  const subscribed = val.subscribedToMailingList;

  // Building Email message.
  mailOptions.subject = subscribed ? 'Thanks and Welcome!' : 'Sad to see you go :`(';
  mailOptions.text = subscribed ? 'Thanks you for subscribing to our newsletter. You will receive our next weekly newsletter.' : 'I hereby confirm that I will stop sending you the newsletter.';

  return mailTransport.sendMail(mailOptions)
    .then(() => console.log(`New ${subscribed ? '' : 'un'}subscription confirmation email sent to:`, val.email))
    .catch((error) => console.error('There was an error while sending the email:', error));
});

我的问题是，在我将代码部署到firebase功能后，控制台显示由sendEmailConfirmation导致的event2.val无法顺利执行不是一个功能。

我当前的代码与我的自定义代码和原始代码相结合，sendEmailConfirmation是原始代码。独立运行原始代码时，它确实有效（原始版本为event而不是event2用于快照。

请告知。

Answer 1

您似乎已更新到Firebase SDK for Cloud Functions v1.0，但未升级您的代码以匹配。

整个过程在this documentation page中解释。现在你被changes in database triggers击中了，这表明：

事件数据现在是DataSnapshot

在早期版本中，event.data是DeltaSnapshot;现在在v 1.0中它是DataSnapshot。

对于onWrite和onUpdate个事件，data参数包含before和after个字段。其中每个都是DataSnapshot，admin.database.DataSnapshot中提供了相同的方法。例如：

之前（＆lt; = v0.9.1）
exports.dbWrite = functions.database.ref('/path').onWrite((event) => {
  const beforeData = event.data.previous.val(); // data before the write
  const afterData = event.data.val(); // data after the write
});
现在（v1.0.0）
exports.dbWrite = functions.database.ref('/path').onWrite((change, context) => {
  const beforeData = change.before.val(); // data before the write
  const afterData = change.after.val(); // data after the write
});

根据这个例子，你需要这些内容：

exports.sendEmailConfirmation = functions.database.ref('/users/{uid}').onWrite((change, context) => {
  const snapshot = change.after;
  const val = snapshot.val();
  console.log(val)

  if (!snapshot.changed('subscribedToMailingList')) {
    return null;
  }

  const mailOptions = {
    from: '"Spammy Corp." <noreply@firebase.com>',
    to: val.email,
  };

  const subscribed = val.subscribedToMailingList;

  // Building Email message.
  mailOptions.subject = subscribed ? 'Thanks and Welcome!' : 'Sad to see you go :`(';
  mailOptions.text = subscribed ? 'Thanks you for subscribing to our newsletter. You will receive our next weekly newsletter.' : 'I hereby confirm that I will stop sending you the newsletter.';

  return mailTransport.sendMail(mailOptions)
    .then(() => console.log(`New ${subscribed ? '' : 'un'}subscription confirmation email sent to:`, val.email))
    .catch((error) => console.error('There was an error while sending the email:', error));
});

Answer 2

从firebase-functions模块的1.0.0版开始，数据库onWrite事件现在提供Change对象而不是DataSnapshot对象作为第一个参数。您可以在documentation中了解1.0.0中的所有重大更改。您应该使用此更改对象来选择是否要在调用它的更改之前或之后检查数据库的内容。

Firebase onWrite触发器的云函数：snapshot.val不是函数

2 个答案:

事件数据现在是DataSnapshot