'Remember Me' using the Go gorilla framework
A ‘Remember Me’ type functionality is something that is available on most websites today. Essentially what it does is that if the checkbox is checked when logging in, the session is kept logged in for a much longer duration (say a week or month). Otherwise, when you close the browser, the session terminates and you have to log in again the next time you visit the site. In golang, it is implemented easily using the gorilla toolkit.
GoCVE
Just released a new tool I have been working on: GoCVE GoCVE is a simple golang based command line tool to query CVE data. All you have to do is download the CVE data and insert it into a local database you run (currently sqlite and postgres are supported). The tool helps you to download CVE data and also populate the DB. You can then use GoCVE to conveniently get, search or list CVE data, from the command line.
Co-operation and Competition
I came across an interesting term in a book I just read. The Origins of Virtue by Matt Ridley. In it he used the term “Co-operation and Competition” as a means to describe the “tug-of-war” within the various biological processes of the human body. The same applies to industry / society / economies too. A healthy combination of both is required to thrive. Co-operation on it’s own would devolve into something like Communism.
Go Docker Container
If anyone is looking for a ubuntu based container with golang 1.13, I just pushed one up to docker hub: docker pull jimmyislive/goubuntu And this container has vim ! (Not sure why many public containers don’t have any editor installed on them.) The Dockerfile used to build this container is available on Github
Text to Morse Code
Recently I learnt morse code. It was pretty easy to translate characters to dot/dashes (it took me under a day). I then wrote a Go program to translate text to morse code and back. If anyone wants to play with it, it is available at text2morse.jimmyislive.dev The site is hosted by Netlify and the backend is built using terraform, api-gateway and aws lambda. Enjoy !
Automated setup of a static site on S3 using Terraform
Many people, businesses don’t need a dynamic website. they just need a placeholder on the web that gives information to customers about their business, contact info, address etc. A static website is a pretty easy way to achieve this. AWS S3 allows you to host static content and serve it up as webpages. You can set it up manually by following instructions here. This post provides scripts for automating it via Terraform.
AWS Config
AWS Config is a service provided by AWS to keep track of configurations (and their possible drift) of all the resources you bring up in AWS. When your infrastructure setup is small, you probably don’t have to be worried about a configuration store for your resources. But as you grow, it would become increasingly difficult to manage and keep track of all the moving pieces, especially if you have a team of engineers continually deploying and changing things.
Free Scratch course for kids
A while back I created some scratch exercises for my kids. It is modeled as a series of exercises (with solutions) that you/your kids can try as you learn programming. Just put it in the form of a free course: Scratch for Beginners. Enjoy!
Testing with Go
An integral part of the development licefycle is writing tests. Write tests early, write tests often as they say. Go makes it very easy to write tests. The following post will go through the basics of testing with Go. Let’s say we have a program that counts the number of vowels, consonants, digits and everything else within an input string. It may look something like this: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 package main import ( "flag" "fmt" ) // CountChars counts the number of characters in a string func CountChars(str string) (int, int, int, int) { vcount := 0 ccount := 0 dcount := 0 ocount := 0 for i := 0; i < len(str); i++ { switch str[i] { case 'a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U': vcount++ case 'b', 'c', 'd', 'f', 'g', 'h', 'j', 'k', 'l', 'm', 'n', 'p', 'q', 'r', 's', 't', 'v', 'w', 'x', 'y', 'z', 'B', 'C', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'V', 'W', 'X', 'Y', 'Z': ccount++ case '1', '2', '3', '4', '5', '6', '7', '8', '9', '0': dcount++ default: ocount++ } } return vcount, ccount, dcount, ocount } func main() { inputStr := flag.
Introduction to Go Modules
Table of Contents Preface Why Go Modules Philosophy Example Preface All the content for this post was gathered by reading the 7 part blog series by Russ Cox and other notes. There is also an introductory post on the Go blog. I would encourange you to read them as well. Why Go Modules Before jumping into the workings of Go modules, we should first understand why we need it in the first place.