Firebase realtime database trigger timing test

firebase-timing-test.js

'use strict'; // until node.js supports modules

console.time('require dependencies');
const functions = require('firebase-functions');
console.timeEnd('require dependencies');

function checkDelay(event) {
	const time = Date.now();
	const eventTime = Date.parse(event.timestamp);
	const snapshot = event.data;
	const path = snapshot.ref.path.toString ? snapshot.ref.path.toString() : snapshot.ref.path.pieces_.join('/');
	if (snapshot.exists()) {
		console.log(`Trigger delay for ${path} @ ${eventTime}: ${time - eventTime}ms`);
	} else {
		console.log(`Data deleted for ${path} @ ${eventTime}: ${time - eventTime}ms`);
	}
	return Promise.resolve();
}

console.time('setting up triggers');
exports.checkDelay = functions.database.ref('/projects/{projectId}/data')
	.onWrite(checkDelay);
console.timeEnd('setting up triggers');