Node set variable from text file - node.js

Question

I am working on oauth2 for an API client, and I am having trouble getting the promise back in time to continue with the other calls to the API. My tokens expire every 30 minutes and my node runs every 10 minutes. I thought I could set a text file to the newest token each time the script runs, and grab it at the beginning and always have a good token to use for auth. The variable doesn't get set in time to make the calls, so the header has undefined next the Bearer. I can't figure out how to get the variable set before the call goes off.
Here is the script I am using to make the calls
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const Axios = require("axios");
const moment = require("moment");
const config = require("../config/default");
const oauth = require("axios-oauth-client");
const fs = require('fs');
let accessToken;
var token = fs.readFile('token.txt', 'utf8', function(err, data) {
if (err) throw err;
return data;
});
const getOwnerCredentials = oauth.client(Axios.create(), {
url: 'url',
grant_type: 'password',
client_id: 'username',
client_secret: 'secret',
username: 'username',
password: 'password',
scope: 'scope'
});
const tokenCall = async () => {
const result = await getOwnerCredentials();
return result
}
const getToken = async () => {
const accessToken = await tokenCall();
const fs = require('fs')
fs.writeFile('/root/qt-cwsedona/token.txt', '', function(){console.log('done')})
fs.writeFile('token.txt', accessToken.access_token, function (err) {
if (err) return console.log(err);
});
};
getToken();
class Sedona {
constructor() {
this.baseUrl = config.sedonaUrl;
this.client = Axios.default.create({
baseURL: this.baseUrl,
auth: {
Authorization: 'Bearer ' + token
},
});
console.log(this.client);
}
getCustomerBillId(customer_id) {
return this.client.get('/CustomerBill/' + customer_id).then(response => {
let result = parseInt(response['data'][0]['CustomerBillId']);
if (isNaN(result)) {
return "";
}
else {
return result.toString();
}
}).catch(error => {
throw error;
});
}
Then I am this code to actually kick off these functions
const Sedona = require("./services/SedonaService");
Promise.all([
sedona.getCustomerBillId(customerId)
]).then(sedona_results => {

Answer 1

This is probably not the right way to do this, but I was able to set the default header for axios in the async function and it worked.
const getToken = async () => {
const accessToken = await tokenCall();
const token = accessToken.access_token;
Axios.defaults.headers.common['Authorization'] = 'Bearer '+accessToken.access_token;
};