Banlist by key with expires and many backends for NodeJS

Supported backends:

• Local process RAM
• pdzGlobalCache ( https://www.npmjs.com/package/@pdz/gc )
• MongoDB ( https://www.npmjs.com/package/mongodb )
• Redis ( https://www.npmjs.com/package/redis ) v4

Example:

'use strict';

const pdzGC = require('@pdz/gc');
const redis = require('redis');
const mongodb = require('mongodb');
const pdzBan = require('@pdz/ban');
const { createHash } = require('crypto');
const md5 = (data) => createHash('md5').update(String(data)).digest('hex'); // for keys hashing

const banConf = {
	try_max: 3, // Maximum number of attempts before getting banned
	try_period: 1000, // After this period, the attempts counter is reset. The countdown is carried out from the last attempt.
	ban_period: 3600000, // Ban time.
	ban_extend: false, // If true - the ban period is extended if attempts are not stopped. If false - the ban is removed after the ban period is expired, regardless of additional attempts during the ban.
	ns: 'pdzban', // For Redis is prefix (pdzban:*), for MongoDB is collection name, for pdzGlobalCache is main key.
	keyHashFunc: md5 // For some backends using some characters in key name is unacceptable. Hashing is simple way to support any key names.
}

const gc = pdzGC.create().start();
const mo = new mongodb.MongoClient('mongodb://localhost:27017');
const red = redis.createClient();

const main = async () => {
	// Connect backends
	await mo.connect();
	await red.connect();
	// Start ban system for many backends
	const ban = new pdzBan(banConf);
	const gcBan = new pdzBan(banConf, gc);
	const moBan = new pdzBan(banConf, mo);
	const redBan = new pdzBan(banConf, red);
	for(let i = 0; i < 5; i++) {
		// Add new attempt to banlist
		await ban.add('127.0.0.1');
		await gcBan.add('127.0.0.1');
		await redBan.add('127.0.0.1');
		await moBan.add('127.0.0.1');
		// Wait 300ms
		await new Promise(pres => setTimeout(pres, 300));
		// Check ban - if key is banned - returns milliseconds until ban removing, if key is not banned - returns undefined
		console.log(
			await ban.get('127.0.0.1'),
			await gcBan.get('127.0.0.1'),
			await redBan.get('127.0.0.1'),
			await moBan.get('127.0.0.1'),
		);
	}
	// Clear all bans
	await ban.clear();
	await gcBan.clear();
	await moBan.clear();
	await redBan.clear();
	// Stop backends
	await mo.close();
	await red.disconnect();
}

main();

Result:

undefined undefined undefined undefined
undefined undefined undefined undefined
3599693 3599693 3599694 3599694
3599387 3599387 3599388 3599388
3599082 3599082 3599082 3599083