Copying data from Firebase Realtime Database to a Google Sheet in real time via Cloud Functions

README.md

Copying data from Firebase Realtime Database to a Google Sheet in real time via Cloud Functions

If you're trying to do this, you came to the right place!

Watch this code work in real time: https://twitter.com/CodingDoug/status/940022568089554944

See also this gist for copying in the other direction: https://gist.github.com/CodingDoug/44ad12f4836e79ca9fa11ba5af6955f7

Setup

1. Follow step 1 to enable Google Sheets API in your Firebase project: https://developers.google.com/sheets/api/quickstart/nodejs

2. Create a service account in your project; save the json file in the functions folder; require() it to "serviceAccount".

3. Create a spreadsheet in Drive; rename the first worksheet 'Scores'; add Player and Score headers in row 1.

4. Share it with edit access to the email address of your service acct.

5. Copy the spreadsheet id (from its URL) to the spreadsheetId string.

6. npm install firebase-admin firebase-functions googleapis lodash

7. Deploy this (TypeScript) code.

8. Update the keys/values in your database under /scores and watch them get updated in the sheet!

firesheetz.ts

// Copyright 2017 Google LLC.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import * as functions from 'firebase-functions'
import * as google from 'googleapis'
import * as _ from 'lodash'
const sheets = google.sheets('v4')

const spreadsheetId = 'YOUR_SPREADSHEET_ID_HERE'

const serviceAccount = require('../your_service_account_credentials.json')
const jwtClient = new google.auth.JWT(
    serviceAccount.client_email,
    null,
    serviceAccount.private_key,
    ['https://www.googleapis.com/auth/spreadsheets'], // read and write sheets
    null
);

const jwtAuthPromise = new Promise((resolve, reject) => {
    jwtClient.authorize((err, tokens) => {
        console.info("Tokens", tokens)
        if (err) {
          console.error(err)
          reject(err)
          return
        }
        resolve(tokens)
    })
})

export const copyScoresToSheet = functions.database.ref('/scores').onUpdate(event => {
    const data = event.data.val()
    console.info(data)

    // Sort the scores.  scores is an array of arrays each containing name and score.
    const scores = _.map<any, [string, number]>(data, (value, key) => [String(key), value])
    scores.sort((a,b) => {return b[1] - a[1]})

    return jwtAuthPromise.then(tokens => {
        return new Promise((resolve, reject) => {
            sheets.spreadsheets.values.update({
                auth: jwtClient,
                spreadsheetId: spreadsheetId,
                range: 'Scores!A2:B7',  // update this range of cells
                valueInputOption: 'RAW',
                resource: { values: scores }
            }, (err, result) => {
                if (err) {
                    console.log(err)
                    reject(err)
                    return
                }
                console.log(result)
                resolve(result)
            })
        })
    })
})