使用Firebase云功能发送通知

Question

In order to use Firebase Cloud Messaging to later send notifications, I am trying to write a cloud function called sendNotification ; and I meet a problem in the process. If possible, I would like to get some advice on how to deal with the issue; or maybe just have somebody point out a mistake I may be doing.

Here is the error message I get when running the command:

firebase deploy

⚠  functions[sendNotification(us-central1)]: Deployment error.
Function load error: Code in file index.js can't be loaded.
Did you list all required modules in the package.json dependencies?
Detailed stack trace: Error: Cannot find module 'serviceAccountKey.json'
    at Function.Module._resolveFilename (module.js:476:15)
    ........

It may useful to say that the file serviceAccountKey.json is in the directory called node_modules , in other words not missing. Here is the code in index.js:

const functions = require('firebase-functions');
const admin = require('firebase-admin');
var serviceAccount = require('serviceAccountKey.json');

admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    databaseURL: 'https://myapp.firebaseio.com'
});

exports.sendNotification = functions.https.onRequest((req, res) => {
    let registrationToken = "abc123.........789xyz";
    var payload = {
        notification: {
          title: "NotifTit",
          body: "The good stuff."
        },
        token: registrationToken
    };

    admin.messaging().send(payload)
    .then((response) => {
        console.log("Successfully sent message: ", response);
    })
    .catch((error) => {
        console.log("Error sending message: ", error);
    })
});

Here is the contents of the package.json file:

{
  "name": "functions",
  "description": "Cloud Functions for Firebase",
  "scripts": {
    "serve": "firebase serve --only functions",
    "shell": "firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "dependencies": {
    "firebase-admin": "~6.0.0",
    "firebase-functions": "^2.1.0"
  },
  "private": true
}

Answer 1

You cannot load files from the node_modules folder, since that folder is ignored when uploading your functions.

Firebase dev Lauren Long commented :

But one thing to keep in mind is that the entire node_modules folder is ignored during uploading of source code, so your package.json has to contain all of your dependencies and cannot reference any files inside of 'node_modules'. In other words, your functions should still be able to work if you ran the following commands inside of the functions folder:

rm -rf node_modules 
npm install