Author Archives: cyberaka

About cyberaka

My name is Abhinav Anand and I am an ex entrepreneur. I am currently working as a Solution Architect. My roles are managing the team and project design/architecture development. I started working in the year 2001 as a freelancer and developed softwares for local business houses. During this stint I developed accounting, payroll, inventory, institute management softwares for multiple firms. The crowning achievement during this period was Cash Master and Visual Accounts which were highly used by their respective customers. I did this for almost 3 full years and I learnt from experience that it is difficult for a single person to design big product although you have more control but you are limited to your talent only. You need preferably a small talented team if you want to do anything big. From 2004 I started working in process automation and visualization (HMI) related software. This was a rewarding experience and I developed core competence at many interesting concepts and technology. I got a great deal of experience in team based development and got a very knowledge rewarding technical sales support experience. It is unfortunate that the company I work for and the company for whom they designed the product have both closed their business within 4 years of my leaving. I did this for around 3 years and I learnt from this experience that you cannot focus on a single customer and grow. As a consulting firm you have to hedge your risk on multiple customers and accounts. Whereas as a product firm you need to have a very solid financial backing to break into a market and keep yourself afloat. The most important lesson I personally learnt was to keep clear of products which take better portion of a decade to become successful. From 2007 onwards my focus narrowed down to mobile and web integrated projects. I worked on multiple projects in J2ME (Symbian, Blackberry) and Android. I saw Android’s first release and I loved the power it gave to developers in comparison to iPhone ecosystem. I think the coming of Android changed the game and gave way to the opening up of the iOS development environment to average joe developer. I knew the coming decade was going to be a mesh of mobile and web based solution. The future is all about combining consumer electronics and software for a compelling product. From 2010 onwards I finally got fully involved with my own venture and my focus was developing Android and iOS apps. My goal was to be identified as a dependable mobile based product maker with a solid portfolio of mobile based software. Till date my company has developed Blackberry, iOS and Android apps in variety of small to medium domains. From 2014 onwards I got back into a Job and shutdown my venture. I did this as I had become bored and wanted to work in a bigger team and project. I worked for a while in a Big Data analytics company. Finally I moved to a new company which wanted me to hire a team and write a Retail ERP software from scratch. It has been a very challenging experience and I had to relearn a number of things to get things done. I am still not fully done with this ERP but the end is in sight. It has been a very rewarding experience to work with AngularJS, Spring Boot, Docker, Mockito etc. which were totally new to me. But the technology choices have paid back handsomely.

Prettify JSON on Terminal

I love using curl command on my Mac terminal to debug my REST endpoints. However the REST call JSON output used to come in a blob of text which required further formatting in an Editor like Visual Studio Code. To allay this problem I ended up installing “jsonpp” using homebrew.

brew install jsonpp

So now I just pipe the output of my curl command to the jsonpp program and I get a fully formatted JSON.

$ curl http://localhost:8080/test | jsonpp
{
"year": 2018,
"month": 2,
"worked": 18,
"leaves": 2
}

 

 

Curl Command New Line Post Output

I like to use curl instead of UI tools like Postman for debugging my RESTful web services traffic whenever possible. I however didn’t like my output being messed up by the bash prompt being suffixed to the output. Something like the following:

$ curl -H "$auth_token" http://localhost:8080/xyz/abc-efg
["-","A","B","C","D","E"]$

So basically what I needed was to have a new line forced after the curl output. A quick search on internet yielded this article. So I executed the following command on my terminal.

$ echo '-w "\n"' >> ~/.curlrc

After doing this when I execute the same curl command I get the following output.

$ curl -H "$auth_token" http://localhost:8080/xyz/abc-efg
["-","A","B","C","D","E"]
$

So now the bash prompt is actually coming on a new line by default!

Validating Signature in PDF documents in Acrobat Reader

I received a digitally signed document from a trusted source. However when I proceeded to take a print it came out with “Signature Not Verified” in place of the signature field. This was not going to work so I did some googling and found out this link. It basically allowed me to validate the signature and take a printout with “Signature Valid” in place of the digital signature.

Triggering download of file using JavaScript

I recently needed to write a small piece of download code. So you pass in the ID of the document to a REST API and it should give you back a blob of the actual file. The problem however is how to actually save this blob of binary data into a local file. So a quick Googling threw up some interesting links which I finally used to finalize my solution.

Code to detect file name

Code to trigger download

Fractal Folders

I have asked myself this question a number of times. What is the best possible way to structure my UI code? Should I cluster the files using functionality or by the type of file? etc. etc.

I found a partial answer in Fractal Folders while learning ReactJS. This basically proposes that for an UI page there are many functionalities which it is comprised of and the artefacts related to these sub-functionality should be clustered as sub-folders.

 

Uninstalling and reinstalling brew

I use brew utility for all my terminal based installation needs. However recently I had to deal with a corrupted brew install. To fix this I followed this link. The uninstallation and reinstallation worked fine and I now have a working brew instance.

The commands as mentioned in the above link are:

$ cd `brew –prefix`
$ rm -rf Cellar
$ brew prune
$ rm -rf Library .git .gitignore bin/brew README.md share/man/man1/brew
$ rm -rf ~/Library/Caches/Homebrew
$ ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)”

 

Export JSON from RoboMongo

I use RoboMongo extensively for all my Mongo development work / debugging. I however sorely needed a way to export JSON from it. A Stack Over Flow link came up in a Google search and I was able to export JSON for my use. Basically you need to execute this command which uses “printjsononeline” function provided by Mongo to give you one line JSON for each row in the collection:

db.getCollection('collection_name').find({}).forEach(function(x){printjsononeline(x)});