Sign in

University of Westminster • Former Software Engineering Intern — DirectFN | Mubasher • https://www.linkedin.com/in/aselsiriwardena/

This daemon can be used in the application server or in the database server to execute system commands using rest API calls.

Hello, I’m Asel. Today, I am going to show you how to create a rest API for executing system commands in your server. This method is used by well-known companies. Imagine you have moved your database to another server other than your backend server and you want to take control of your database server from your backend API. For that, we have to create a daemon in the database server.

*note — I’m writing this as a POC. If you are going production you should consider security issues seriously( using https etc).

Step 1 — Picking up dependencies

Let’s start by adding a couple of dependencies…


Build your API with the most-loved language of the past four years on Stack Overflow

Hello, I’m Asel. Today, I am going to show you how to create a simple REST API in Rust.

For that, we are going to use the Rocket framework for the API and Diesel ORM framework for persisting features. This framework will cover all the things mentioned below. So, it will be much easier than implementing it from scratch.

  • Start a web server and open a PORT.
  • Listen to requests on this PORT.
  • If a request comes in, look at the Path in the HTTP header.
  • Route the request to the handler according to the Path.
  • Help you extract the…


bring your workstation to your laptop.

Hi, I’m Asel, In this article, I’m going to show you how I manage to use one monitor with my laptop and workstation hassle-free. From this method, you can use your Ubuntu desktop from a laptop anywhere in your home/office.

As I mentioned before I wanted to use my monitor for my laptop while using my workstation. For that, I found two options.

  • SSH
  • RDP

SSH into my machine is a nice way but I wanted a get my desktop experience. Sometimes it’s very useful. The most awesome thing is you can copy it to a clipboard and past it…


Let’s host our application on a Heroku server

Linking services with Google
Linking services with Google

In this article, I’m going to show you how to add Google sign-in to your JavaScript web app. These code snippets will be valid for your pure JavaScript/jQuery/Node.js applications.

First, you need to create a simple login that will give the function to log in manually using a username and password. Then you need to set up a Google Developer account and use the Credentials page to create app OAuth keys.

  1. Go to the Credentials page.
  2. Create a new project if you haven't had any projects. After that, you need to give some details about your project. If you are…


Let’s build more robust concurrency systems

State diagram generated by the LTSA tool
State diagram generated by the LTSA tool

Hello, I’m Asel. Today, I’m going to show you how to model a concurrent program using FSP by going through an example scenario.

What’s FSP?

Finite state processes (FSP) is an abstract language that’s used to develop concurrent systems of processes.

We use modeling to gain confidence in the adequacy and validity of a proposed design. As with most complex design tasks, concurrency is best understood by employing multiple levels of abstraction.

First, the functional requirements of the system must be well understood in terms of its desired behavior. Next, the possible roles for concurrency should be explored. …


Writing a PID as a software engineering undergraduate.

Why PID is IMPORTANT?

You may have been wondering why on earth we are wasting weeks doing documentation like this. You may think, why don’t we start doing prototyping so you can get ahead of schedule. Doing research is not that simple; It’s a well-planned task. Actually, documenting phases will help you in the rest of the project. It is the first basic step to ensure your project sets off on the right foot.

If you want to write a good PID, first, you have to understand its flow. All the topics are in PID are nicely connected. …


Get to know about one of the major scams in both crypto and stock trading before start trading.

Let's understand Pump and dump in a nutshell. A pump and dump scheme refers to a group of people artificially inflating the price of an asset through recommendations based on false, misleading, or greatly exaggerated statements. In essence, they will buy an asset for a low price all at once, prompting the price to rise. This sudden and rampant increase in nominal value will prompt unknowing traders to jump in and purchase the asset as they hope to ride a bull market. The original buyers then sell (dump) the assets to make a quick profit. …


Get to know about the world's largest open-source contribution event.

Hacktoberfest is a monthlong celebration of open source software run by DigitalOcean. Hacktoberfest is open to everyone in our global community! Four quality pull requests must be submitted to public GitHub repositories. You can sign up anytime between October 1 and October 31.

How can a beginner participate?

It's simple. All you need is a Github account. GitHub is the center of the open-source universe. Register at hacktoberfest.digitalocean.com. Then you need to make 4 valid pull requests to a public repo. That's all!


Verify that your app works and looks great in all supported languages

In this article, I’m going to show you how to set up Travis CI to build multiple language applications in the same GitHub repo.

First, you have to make a repository on GitHub. I’m going to quickly skip through that step and assume that you have created the project in your local machine. Since I love Rust, I chose Rust and Angular to do this demo.


Performance tuning for your web applications using web workers.

Angular 8 was released a few months ago. I’m gonna mention the angular 8 new features before going to explain who to use web workers.

  • Preview of Ivy
  • Web Workers
  • Lazy Loading
  • Improvement of ngUpgrade

These are more like performance upgrades to compete with React. hahaha!

There are two popular ways to integrate Web Worker in your angular application:

  1. Run all the business logic of your application in a web worker thread.
  2. Run some CPU intensive business logic in a web worker thread.
    (Like a password encryption processes in the login)

I’ll explain my experience with web workers and why…

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store