You build your first Golang web application and running in a remote server via SSH. The problem with that is once the SSH session is terminated it also kill any running programs associated with that SSH session. Using nohup solves this problem but I think this is okay during development and testing phase. A better […]
Use OpenSSL generate a self-signed certificate for Golang. In this code snippet I created a certificate with validity of 15 years. openssl genrsa -out server.key 2048 openssl req -new -x509 -sha256 -key server.key -out server.crt -days 5475 Once you create the certificate and key you can use it in your Golang HTTP like this log.Fatal(http.ListenAndServeTLS(“:”+port, […]
To randomly create a time.Sleep in Golang you can use the code snippet below. You may want to simulate a load in your web server and have an arbitrary seconds or minutes before getting the reply. rand.Seed(time.Now().UnixNano()) delta := rand.Intn(60 + 1) // randomly generates numbers 1 to 60 time.Sleep(time.Duration(delta) * time.Second) // sleep and […]
In response to this facebook post. I created a simple bus seat reservation user interface using VueJS. I started by preparing an SVG image of the bus seat and then render the SVG elements using Javascript (VueJS). You can use a raster image (sprite) for this but I prefer to use vector graphics (SVG) because […]
Perhaps you may need a ledger type query that can display a running total like the one on a bank statement. SELECT a.*, (@running_balance:[email protected]_balance+(a.credit-a.debit)) AS ‘balance’ FROM ledger a JOIN (SELECT @running_balance := 0) b WHERE a.id_user = ? AND a.account_type = ? AND a.year = ? […]
SELECT * FROM product t1 LEFT JOIN promo_product t2 ON t1.idProduct = t2.product_idProduct WHERE t2.idPromoProduct IS NULL […]
Do you ever wanted to have an HTML drop-down with default selected value (placeholder) that the user cannot re-select once they selected any valid value options? It can be done easily by adding selected and disabled attributes on the option element. Code Snippet <div class="row form-group"> <label class="col-12 pl-0">Status</label> <select class="form-control col-12"> <option value="" selected="selected" […]
You can easily create an Android Studio shortcut by creating an desktop entry using the following the steps below. In this guide, my Android Studio is installed in /opt/android-studio folder. Your folder location may differ. 1. Open terminal and type cd ~/.local/share/applications 2. Create a .desktop file using your favorite text editor nano android-studio.desktop 3. […]
I was building a multi-module project and I faced with this annoying problem with maven that keeps using old version of the maven project even though I uses mvn install -U. I usually delete my local .m2 repository folder but I found a much cleaner way to do it. mvn dependency:purge-local-repository […]
Did you enabled the full disk encryption (LUKS) on Ubuntu 18.04? I would like to share how you can change the LUKS password. LUKS stands for Linux Unified Key Setup developed in 2004 by Clemens Fruhwirth. Similarly, Apple’s macOS have FileVault and BitLocker for Microsoft Windows operating system. In the terminal you can check the […]