How to create new Firebase Realtime Database Instance using Cloud Functions?

Question

I have been using firebase for different kind of projects with firestore. But, I have not used real-time database due to low concurrent connection and some factors. Firestore also have some limitation such as 10000 per second per database. When I compare firestore with realtime database, It is possible to manage high traffic with many databases using real-time database. I red different articles and stack overflow questions and they had mentioned use cloud task and cloud scheduler to mange write failures in firestore. However, My questions are,

Can I use cloud functions to create real-time databases?

How many real-time databases can be created per project? (I am going to create a database per user, If there 1 Million Users = 1 Million real-time databases)

Does this answer your question? Is it okay to create many instances of firebase realtime database (>20) in one project From the answer: "There is no documented limit to the number of databases (often referred to as shards) you can have within a project. Each database essentially functions as a completely separate instance, so there isn't any reason to have a limit at all." — Dharmaraj
– Dharmaraj, Commented Jul 19, 2021 at 11:08
That question do not mention about creating real-time databases via cloud function — Isuru Bandara
– Isuru Bandara, Commented Jul 19, 2021 at 11:11
If my answer was helpful, you can accept & upvote it else feel free to ask further questions. — Dharmaraj
– Dharmaraj, Commented Jul 19, 2021 at 12:33
For your last questions, see stackoverflow.com/a/55314601/209103 — Frank van Puffelen
– Frank van Puffelen, Commented Jul 19, 2021 at 13:17

Dharmaraj · Accepted Answer · 2021-07-19 13:34:46Z

2

You can use the Firebase Realtime Database Management API to create new instances of Realtime Database from a Cloud function. You need an access token with these scopes:

[
  'https://www.googleapis.com/auth/cloud-platform',
  'https://www.googleapis.com/auth/firebase'
]

Now the easiest way to do this is use googleapis node module in you cloud function along with your service account.

const { google } = require('googleapis');

exports.createDbInstance = functions.https.onCall((data, context) => {
  const auth = new google.auth.GoogleAuth({
      keyFile: __dirname + '/serviceAccountKey.json',
      scopes: ['https://www.googleapis.com/auth/cloud-platform']
  });

  const accessToken = await auth.getAccessToken()
  const response = await google.firebasedatabase("v1beta")
          .projects
          .locations
          .instances
          .create({ 
            databaseId: "new-db-id", 
            parent: "projects/[PROJECT-ID]/locations/[LOCATION]",
            access_token: accessToken 
          })
  console.log(response)
  return {data: "New Database Created"}
});

You can download a Service Account JSON file from here: https://console.firebase.google.com/u/0/project/_/settings/serviceaccounts/adminsdk

This shouldn't ideally be a callable function with no authentication. Make sure you implement your own logic so only authorized people can call this function.

[PROJECT-ID] is the ID of project in which you want to create the database.

[LOCATION] is the location you want to create the database in. Here is a list of available locations.

edited Jul 19, 2021 at 13:34

answered Jul 19, 2021 at 12:28

Dharmaraj

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8 Comments

Isuru Bandara Over a year ago

@Dharmaraja, Let me try and I will let you know, Thank you.

Dharmaraj Over a year ago

@IsuruBandara sure. You can just create a new node project and paste the code and run it as a short cut ;)

Isuru Bandara Over a year ago

@Dharmaraja Can we update the real-time database rules along with this function?

Dharmaraj Over a year ago

@IsuruBandara Yes, you can update security rules using the REST API

Isuru Bandara Over a year ago

Thank you mate. One last question. Do you think real-time database per user will be practical? Imaging If we have 1 million users mean 1 million databases, and each database can be have 200k Simultaneous connections.

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