firebase.js

require("dotenv").config();
var firebaseAdmin = require("firebase-admin");

var serviceAccount = {
  type: "service_account",
  project_id: process.env.PROJECT_ID,
  private_key_id: process.env.PRIVATE_KEY_ID,
  private_key: process.env.PRIVATE_KEY,
  client_email: process.env.CLIENT_EMAIL,
  client_id: process.env.CLIENT_ID,
  auth_uri: "https://accounts.google.com/o/oauth2/auth",
  token_uri: "https://oauth2.googleapis.com/token",
  auth_provider_x509_cert_url: "https://www.googleapis.com/oauth2/v1/certs",
  client_x509_cert_url:
    "https://www.googleapis.com/robot/v1/metadata/x509/firebase-adminsdk-zvqgh%40piwatering-80e6c.iam.gserviceaccount.com"
};

firebaseAdmin.initializeApp({
  credential: firebaseAdmin.credential.cert(serviceAccount),
  databaseURL: "https://piwatering-80e6c.firebaseio.com"
});

// setup firebase refs
const rootRef = firebaseAdmin.database().ref("wateringStatus");
const envRef = rootRef.child("wellEnvironment");
const envHistoryRef = rootRef.child("wellEnvironmentHistory");

const historyTimer = 60 * 60 * 1000; //store once per minute
let counter = 0;

function updateDatabase(data, timeDelay = 4000) {
  // console.log(pin, data);
  var timestamp = Date.now();
  for (var key in data) {
    if (data.hasOwnProperty(key)) {
      console.log(key + " -> " + data[key]);
      envRef.child(key).set(data[key]);
      if (counter == 0) {
        envHistoryRef
          .child(timestamp)
          .child(key)
          .set(data[key]);
      }
    }
  }
  if (counter > historyTimer / timeDelay) {
    counter = 0;
  } else {
    counter++;
  }
}

module.exports = {
  updateDatabase
};