Ytukyg

So, I am using the spotify API to do searches. Locally, I tested my code using tsc and node; everything works as expected.

However, when I deploy my index.ts the logs indicate some odd behavior.

At the top of the file I have the following:

 //Load libraries

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

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

const firebase       = require("firebase");

const stripe         = require('stripe')(functions.config().stripe.token)

const SpotifyWebApi    = require('spotify-web-api-node');



//Initialize app

const APP = { 

  apiKey: "my-API-Key",  

  authDomain: "My domain auth",

  databaseURL: "my databse url",

  storageBucket: "my bucket",

  messagingSenderId: "my messenger ID"

}



//The Client Credential Flow for Spotify API

const spotifyApi = new SpotifyWebApi({

    clientId: 'My cliend ID',

    clientSecret: 'My-secret-Key'

});



// Retrieve an access token for Spotify.

spotifyApi.clientCredentialsGrant().then(function (data) {

    console.log('All data Spotify API: ' + data.body )

    console.log('The access token expires in ' + data.body['expires_in']);

    console.log('The access token is ' + data.body['access_token']);

    // Save the access token so that it's used in future calls

    spotifyApi.setAccessToken(data.body['access_token']);

}, function (err) {

    console.log('Something went wrong when retrieving an access token', err);

})



firebase.initializeApp(APP);

admin.initializeApp(APP)

The problem is that the logs indicate that the spotify access token function runs once per Firebase-Cloud Function in my index.js file. I am getting over a dozen tokens, each shows up in the log as called from one of my firebase-cloud functions.

How do I tell Firebase Functions to run this code once and only once when I upload my entire index.ts? And not run it when I upload a single function; that would be useful too.

Thanks.

The top-level code for your index.js is run in each container that Cloud Functions instantiates, to ensure that container is properly initialized for running your functions. Since Cloud Functions may instantiate multiple containers, the code may run multiple times.

There is no way to control the number of containers that Cloud Functions instantiates. If you don't want the code to run in each container, don't make it top-level code in your index.js.

For example, you could create the Spotify credentials on-demand when you function is invoked. That ensures that the credentials are only on containers where your functions are actually invoked, although it does mean that the first invocation of your function in a container will need to get the Spotify credentials, so takes longer to complete.