代码之家 › 专栏 › 技术社区 › T Mack

正确链接Firebase函数中的函数

google-cloud-functions firebase-realtime-database firebase node.js javascript

T Mack · 技术社区 · 6 年前

我正在Firebase Cloud Functions中构建一个函数,它可以利用Node.js模块。

我还是个新手 .then() 我正在努力找到一种方法来链接我的3个功能 webhookSend() , emailSendgrid() 和 removeSubmissionProcessor() 'count' 是递增的(检查 temp_shouldSendWebhook ).回馈承诺的整个想法仍然让我有点困惑,特别是当它涉及到外部图书馆时。

const functions = require('firebase-functions');
const admin = require('firebase-admin');

admin.initializeApp();

const request = require('request');

const firebaseConfig = JSON.parse(process.env.FIREBASE_CONFIG);
const SENDGRID_API_KEY = firebaseConfig.sendgrid.key;
const sgMail = require('@sendgrid/mail');
sgMail.setApiKey(SENDGRID_API_KEY);

exports.submissionProcess = functions.database.ref('/submissions/processor/{submissionId}').onWrite((change, context) => {
  var temp_metaSubmissionCount = 0; // omitted part of function correctly sets the count
  var temp_shouldSendWebhook = true; // omitted part of function correctly sets the boolean

  return admin.database().ref('/submissions/saved/'+'testuser'+'/'+'meta').child('count')
    .set(temp_metaSubmissionCount + 1)
    .then(() => {

      // here is where im stuck
      if (temp_shouldSendWebhook) {
        webhookSend();
        emailSendgrid();
        removeSubmissionProcessor();
      } else {
        emailSendgrid();
        removeSubmissionProcessor();
      }

    })
    .catch(() => {
      console.error("Error updating count")
    });

});

function emailSendgrid() {
  const user = 'test@example.com'
  const name = 'Test name'

  const msg = {
      to: user,
      from: 'hello@angularfirebase.com',
      subject:  'New Follower',
      // text: `Hey ${toName}. You have a new follower!!! `,
      // html: `<strong>Hey ${toName}. You have a new follower!!!</strong>`,

      // custom templates
      templateId: 'your-template-id-1234',
      substitutionWrappers: ['{{', '}}'],
      substitutions: {
        name: name
        // and other custom properties here
      }
  };
  return sgMail.send(msg)
}

function webhookSend() {
  request.post(
    {
      url: 'URLHERE',
      form: {test: "value"}
    },
    function (err, httpResponse, body) {
      console.log('REQUEST RESPONSE', err, body);
    }
  );
}

function removeSubmissionProcessor() {
  admin.database().ref('/submissions/processor').child('submissionkey').remove();
}

2 回复 | 直到 6 年前

helloitsjoe 6 年前

为了链接这些函数,它们都需要返回一个承诺。当它们这样做时,您可以按如下顺序调用它们:

return webhookSend()
  .then(() => {
    return emailSendgrid();
  })
  .then(() => {
    return removeSubmissionProcessor();
  });

或者像这样并行:

return Promise.all([webhookSend, emailSendgrid, removeSubmissionProcessor]);

现在,让您的函数返回承诺:

emailSendgrid :看起来这会返回一个承诺(假设 sgMail.send(msg) 返回一个承诺),所以您不需要更改它。

removeSubmissionProcessor :这个电话 admin.database....remove() )但不要等待回应。如果你加上 return 在打电话之前,这应该是可行的。

webhookSend 调用接受回调的函数,因此您需要 fetch request

function webhookSend() {
  return new Promise((resolve, reject) => {
    request.post(
      {
        url: 'URLHERE',
        form: {test: "value"}
      },
      function (err, httpResponse, body) {
        console.log('REQUEST RESPONSE', err, body);
        if (err) {
          reject(err);
        } else {
          resolve(body);
        }
      }
    );
  });
}

-1

Vinil Prabhu 6 年前

使用异步函数,然后可以在每个函数调用之前使用.then()或wait

参考阅读 this