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Concurrency in Go
A reason to choose Go over other programming languages could be to have the need for building software which requires concurrency. Go is built with concurrency in mind. You can achieve concurrency i
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The use of defer in Go
In my previous blog post I have covered how to setup your development environment for Golang including a simple hello world. In case this is your first Go project please have a look on this blog pos
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Start on your first Golang project
A couple of months ago I started to do some coding in Go a.k.a Golang. Not only because they have an awesome logo ;-). My main reason was because I wanted to have something running as bare metal as possible on my Raspberry Pi and I wanted to have it available for different platforms to be easy to install. Some other reasons are the ease of creating async code by using Go in front of your methods and the unique approach of channels to sync between go routines (threads). I have been reading a lot about Go since it was released in 2012, now it was time to really get my hands dirty and try it for myself. Curious, continue reading…
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How to add network driver to Windows 10 PE
Very recently I have been trying to reinstall my Laptop using my WinPE approach as it didn’t have a optical drive anymore. However my problem was that the WinPE image I created was lacking the network
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Merge multiple gradle projects including git history
As we started 2 years ago with a micro-service architecture we faced some issues in the productivity of the teams a while ago. This made me think what we could do about that from an architecture and d
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Responsive Adaptive Progressive impressive webpages
In the last couple of years web applications technologies and frameworks went through a fast paced transformation and evolution. For all these evolutions there was coined a marketing term which (by co
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Upgrade Raspbian Jessie to RaspbianStretch
Very recently I have upgraded my Raspberry 3 to the new Raspbian OS, code named “Stretch”. Due to some security issues in the chipset of the Raspberry Pi 3 and Raspberry zero, I decided to upgrade min
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Using docker-compose for multi Docker container solutions
In this article I want to show you the way for running your multi container solution on Docker. Docker Compose is a tool for defining and running multiple Docker containers using a single command. Wit
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Run your Angular app in a Nginx Docker container
Today you will learn how we can package our static html Angular app in a Docker container running Nginx. By packaging our app in a Docker container we will benefit from the fact that we will have some
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Setting up Docker development environment on Windows/Mac
In this post I want to cover how you can setup a Docker development environment on Windows/Mac. As you might already know Docker requires a Linux kernel to run. Therefore we will always need a VM to
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From errbacks to Promises in Node
In javascript world many APIs and libraries require you to implement most logic using callbacks. As of ES6, also referred to as ES2015, we can use the native Promise API. In most modern browsers an
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Ssl certificate for your Azure website using Letsencrypt
Letsencrypt is a free automated service which provides you SSL certificates for free. Although the certificates are only valid for 3 months, this shouldn’t be a bottleneck as you can fully automate t
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Switch between Hyper-V and Virtualbox on Windows
Since a while I have been using Virtualbox + vagrant to do web development based on Linux, Nginx and NodeJS. However I also still do Windows development occasionally. For that reason I needed a way
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Jasmine vs. Mocha
In this blog post I want to highlight the similarities and the differences between Jasmine and Mocha. In this comparison I will focus on the latest versions of both libraries. As of this writing Jasm
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Put your ssh experience in Windows on Steroids
In this blogpost I want to show you how you can make your life easier to work with Linux VM’s and Git by configuring SSH on your Windows Machine in a secure but convenient way. Let me first elaborate
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Using Gulp.js to check your code quality
In this blog post I want to show you how you can use Gulp.js to automate some tasks to check the quality of your code. Before we deep dive into the subject and the coding examples I first want togive you a short introduction on what Gulp.js actually is. So if you already know what Gulp.js is about you can move on to the next chapter. Easy to useBy preferring code over configuration, gulp keeps things simple and makes complex tasks manageable.EfficientUsing the power of node streams, gulp gives you fast builds that don’t write intermediary files to disk.Previous statements are quoted from the Gulp.js homepage. Gulp.js is just like Grunt.js a task runner build on Node.js aka io.js. Where you define your tasks in Grunt.js in a configuration based style, you will be defining your tasks in Gulp.js more in a code based style. For both task runner there is a wide variety of plugins available. So what is the real power of Gulp.js? In my opinion that is the utilization of the Node.js streams, which makes Gulp.js a very fast and memory efficient task runner. The difference between Gulp.js and Grunt.js can especially be noticed when working on larger projects, with huge amounts of files. In many cases developers are limiting the usage of both task runners to only their javascript projects. As I showed you last time Grunt.js can also be used to automate some of your .Net/c# tasks I want to show you today you can also use it on php projects. So here is my call for action. Stop limiting yourself and try to apply it on any project you’re working on, no matter the language!
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Packer.io machine building and provisioning part 2
In the previous part of this series we had a look on building a bare Debian VM with the bare minimum packages installed to run a web server. In this part we will have a look on how we can improve our packer script with user variables and how to use the file and shell provisioner. User variablesVariables can be easily added to the packer script by adding following JSON. 1234567891011{ "variables": { "username": "root", "password": "r00tme", "memory": "1024", "cpus": "1", "database_name": "{{env `DB_NAME`}}" }, "builders": [{ // Left for brevity} Best practice is to put your variables as the first property in your JSON, before your builders. This way you have all the configurable values to your script quickly accessible. As you can see we define for each variable a default value, which will be used as the value when the user doesn’t provide one. For the “database_name” variable I used a special default. This default will be retrieved from your environment variables. You can set this kind of variable just as you would set any other variable from your command line/shell.
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Packer.io machine building and provisioning part 1
Large development teams are often coping with the “It works on my machine” syndrome. One solution to solve these kind of issues is by give each single developer the same VM, which is most preferably the same as your production server. So imagine your company is building a web application. The web application is hosted on a Debian server using Apache, MySQL and PHP. So considering these preconditions I will give you a simple example to get your machines scripted en fully provisioned. In this first part of these series we will zoom in on the packer.io builders. So let me first explain you what packer is by quoting some statements of their webpage. Packer is a tool for creating identical machine images for multiple platforms from a single source configurationModern, AutomatedPacker is easy to use and automates the creation of any type of machine image. It embraces modern configuration management by encouraging you to use automated scripts to install and configure the software within your Packer-made images. Packer brings machine images into the modern age, unlocking untapped potential and opening new opportunities. Works Great WithOut of the box Packer comes with support to build images for Amazon EC2, DigitalOcean, VirtualBox, and VMware. Support for more platforms is on the way, and anyone can add new platforms via plugins. In order to create an image for a specific platform packer uses builders. Since I don’t want to zoom in on creating your own builder plugin for your own platform and I don’t want you to have more cost to get up your VM I will use the VirtualBox builder in this example. VirtualBox is free to use, so if you don’t have it already installed on your machine please first install VirtualBox to continue with this example. VirtualBox will run on following OSes: Windows, Linux and Mac, so no matter what OS you’re on, you can continue reading.
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Using Mocha Chai Sinon to test Node.js
In this article I’m going to show you how to write tests for your NodeJS application using Mocha, Chai and Sinon. Mocha is a feature-rich JavaScript test framework running on node.js and the browser, making asynchronous testing simple and fun. Mocha tests run serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases. One of the cool things is you can choose your own assertion style when writing Mocha tests. In this article I will use Chai to do my assertions. Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any JavaScript testing framework. Chai supports 3 assertion styles. Should, expect and assert. This makes Mocha and Chai the ultimate combination to make your testing suite completely fit your own project needs and desires. As a mocking framework I choose Sinon since it integrates neatly with Mocha and Chai and dozens of other test frameworks. Standalone test spies, stubs and mocks for JavaScript. No dependencies, works with any unit testing framework. In order to start with writing your tests we first need to install Mocha, Chai and Sinon. Since I use Mocha for multiple projects I choose to install Mocha globally. 12npm install -g mochanpm install --save-dev mocha chai sinon To be sure the consumers of my node package also have mocha installed I also add it to the dev dependencies. Since I installed Mocha globally it won’t be installed in my package folder again. Now we can actually start writing our tests.
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Automate your development tasks using Grunt
Grunt is an extremely useful Node.js package to automate lots of development and continuous integration tasks. The Grunt eco-system has lots of packages available on npm. This enables us to quickly setup our development/continuous integration environment. Grunt tasks mostly have two required properties. An files array, which is used to configure on what files the tasks is executed, and an options property which configures some task specific settings. The files array supports the globbing and minimatch pattern to match files based on the provided expression. So what tasks could you use for your projects, or for which project can you use Grunt? How do I configure Grunt tasks? How do I execute them? All these questions I try to answer for you in this article.