antonioaguilar

A super simple bash script to check the status of a GitLab CI pipeline.

$ git push
...
$ git pipeline-status
Status of last pipeline for user/project on gitlab/master:
"pending"
...
$ git pipeline-status

antonioaguilar

#!/bin/bash
# This script dumps a database to SQL, compresses, encrypts and timestamps it, then saves it to Dropbox. Ideal for a cronjob.
# It uses symmetric encryption, so guard your password carefully.
#
# NOT RECOMMENDED FOR LARGE DATABASES!

# Dump a MySQL database
# Read this for how to get your password into mysqldump:
# https://dev.mysql.com/doc/refman/5.1/en/password-security-user.html
mysqldump -u username > database.sql

antonioaguilar

slow

This bash script offers quick shortcuts to simulate slower network connections. It is useful when you need to simulate a wireless network on a Linux network server, especially when you are using a virtual machine guest on your local machine or in the cloud.

slow 3G                   # Slow network on default eth0 down to 3G wireless speeds
slow reset                # Reset connection for default eth0 to normal
slow vsat --latency=500ms # Simulate satellite internet  with a high latency
slow dsl -b 1mbps         # Simulate DSL with a slower speed than the default

slow modem-56k -d eth0 # Simulate a 56k modem on the eth1 device. eth0 is unchanged.

antonioaguilar

Lodash has a sweet feature called a mixin that lets you alias function names. Below here I alias names that we're used to using in SQL to (roughly) equivalent functions in lodash.

_.mixin({
  select: _.map,
  from: _.chain,
  where: _.filter,
  groupBy: _.sortByOrder,
})

antonioaguilar

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

antonioaguilar

/**
 * Obfuscate a plaintext string with a simple rotation algorithm similar to
 * the rot13 cipher.
 * @param  {[type]} key rotation index between 0 and n
 * @param  {Number} n   maximum char that will be affected by the algorithm
 * @return {[type]}     obfuscated string
 */
String.prototype.obfs = function(key, n = 126) {
  // return String itself if the given parameters are invalid
  if (!(typeof(key) === 'number' && key % 1 === 0)

antonioaguilar

  ZigZag-Encoding
  ---------------
  
  Maps negative values to positive values while going back and
  forth (0 = 0, -1 = 1, 1 = 2, -2 = 3, 2 = 4, -3 = 5, 3 = 6 ...)

  (i >> bitlength-1) ^ (i << 1)

  with "i" being the number to be encoded, "^" being
  XOR-operation and ">>" would be arithemtic shifting-operation

antonioaguilar

'use strict';

//mock for superagent - __mocks__/superagent.js

var mockDelay;
var mockError;
var mockResponse = {
  status() { 
    return 200; 
  },

antonioaguilar

Configure Git to use a proxy

##In Brief

You may need to configure a proxy server if you're having trouble cloning or fetching from a remote repository or getting an error like unable to access '...' Couldn't resolve host '...'.

Consider something like:

antonioaguilar

alias wget='wget -q --no-check-certificate'

# so that we can install virtualbox via apt-get
for x in xenial xenial-security xenial-updates; do
  egrep -qe "deb-src.* $x " /etc/apt/sources.list || echo "deb-src http://archive.ubuntu.com/ubuntu ${x} main universe" | tee -a /etc/apt/sources.list
done
echo "deb http://download.virtualbox.org/virtualbox/debian xenial contrib" | tee -a /etc/apt/sources.list.d/virtualbox.list
wget https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | apt-key add -

apt-get update