Velizar Nenov velizarn

velizarn / iptables-custom-log.bash

Last active January 18, 2017 17:50

Log iptables messages in a custom file with rsyslog

	#!/bin/bash

	IPTABLES_CONF_FILE=/etc/rsyslog.d/iptables.conf

	echo ':msg, contains, ": IPTables Packet Dropped: " /var/log/iptables.log' > $IPTABLES_CONF_FILE
	echo ':msg, contains, ": IPTables Packet Dropped: " ~' >> $IPTABLES_CONF_FILE

	systemctl restart rsyslog

	# http://blog.stalkr.net/2009/10/logging-iptables-messages-with-rsyslog.html

velizarn / sendgrid.bash

Last active April 22, 2025 15:40

Send email from bash script by using SendGrid API

	#!/bin/bash

	SENDGRID_API_KEY=""
	EMAIL_TO=""
	FROM_EMAIL=""
	FROM_NAME=""
	SUBJECT=""

	bodyHTML="<p>Email body goes here</p>"

velizarn / promise.js

Last active December 28, 2017 07:38

JavaScript basic Promise example

	let getName = () => {

	return new Promise((resolve, reject) => {

	let name = "John Doe";

	try {
	setTimeout (() => {
	resolve( name )
	}, 1500)

velizarn / promise-chained.js

Last active December 28, 2017 07:37


	const crypto = require('crypto'), https = require('https')
	// --------------------------------------------------------------------

	let setString = (str = '') => {

	return new Promise((resolve, reject) => {

	let _name = str \|\| 'John Doe';

velizarn / dbUtils.js

Last active December 31, 2017 16:26

How to reuse mongodb connection through Promise

	'use strict'

	const assert = require('assert')

	module.exports = {

	getProductsCount: (req, res) => {

	return new Promise((resolve, reject) => {

velizarn / load-test.js

Last active January 1, 2018 11:18

Run a load test on a given URL


	const http = require('http')

	let getData = (rand = 1) => {

	return new Promise((resolve, reject) => {

	try {

	let url = 'http://localhost:3000/db/products.count?v=' + rand

velizarn / promise-chain-run-all.js

Last active January 3, 2018 08:16

Run array of promises despite of the result

	'use strict'

	global.state = {
	time: null,
	user: null,
	photo: null,
	book: null
	}

	const { getTime, getUser, getPhoto, getBook } = require('./promise_modules')

velizarn / promise-chain-failed-first.js

Last active January 3, 2018 08:17

Run array of promises and stop on first failure

	'use strict'

	global.state = {
	time: null,
	user: null,
	photo: null,
	book: null
	}

	const { getTime, getUser, getPhoto, getBook } = require('./promise_modules')

velizarn / sample-sw.js

Created September 10, 2018 07:16

Generate service worker file

	importScripts('/js/workbox-sw.js');
	workbox.setConfig({
	debug : true
	});
	workbox.core.setLogLevel(workbox.core.LOG_LEVELS.debug);
	workbox.skipWaiting();
	workbox.clientsClaim();
	workbox.core.setCacheNameDetails({
	"prefix" : "nodepwa",
	"suffix" : "web",

velizarn / heroku-postbuild.js

Created March 21, 2019 15:53

Nodejs postbuild script for Heroku