Not really relevant, but using Go to fetch the data, and then Ruby to process the data is the best. I used this exact set up for a project and it was amazing. Really the sweet spot of use cases for both languages.
Same for Ruby, the syntax is perfectly suited for transforming, digging through and acting upon data. I didn't even add a Gemfile, only used standard library functions, transforming the data the Go program mined into usable information serialized in JSON which was subsequently used as a static database for a webpage.
You can find the source here: https://github.com/tinco/stellar-core-go, the Go is in cmd and the Ruby is in tools.
The site it powers is now defunct, apparently they changed some stuff in the past 3 years and the crawler no longer functions.