Mojo Wonk Blog.

A semi-offical blog dedicated to the Mojolicious web framework

Day 16: A pre-Christmas Diet for Mojolicious - A Children's Story

Too many nuts. I'm gonna need to slim down

You've just read How to lose Weight in the Browser and you want to know to slim down your Mojo app. Part of that process is preventing the browser from requesting files that hardly change. I spent a well-caffeinated afternoon trying to do that with Mojolicious. I've been 'round the houses, and spoiler alert I didn't find the answer until the very end, kind of like your favourite Christmas animated special with a small woodland creature narrating "The Gruffalo's HTTP header".

A Children's Story

Our beloved small woodland creature needed to display a web calendar with forest events pulled from a database. Perl could get the event data and package it as a JSON feed. Mojolicious could prepare the webpages with the correct JSON feed for each user. With some JavaScript libraries to display the web calendar, all would be well in the forest.

Everything except the JavaScript libraries are lightweight. And everyone knows a page reload goes so much faster if it doesn't have to download the JavaScript every time. Those libraries won't change for months! If only the client browser knew that it could use the file that it had downloaded last time.

The secret, of course, is to set the Cache-Control field of the HTTP header, but how?

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Day 15: Practical Web Content Munging

An eyeball of alarming size

Following brian d foy's great write-up of using Mojo::DOM selectors from Day 5, I thought it'd be fun to talk about some website migration scripts I recently built using Mojo::UserAgent and Mojo::DOM, in order to show some basic practical usage of these modules. I've never really used Mojo before, but I recently needed to migrate a website that hasn't had a redesign in about 15 years, and it seemed like a great fit for my content mangling needs. In the past I would have used regexes, and probably would have spent at least as much time manually massaging the input or output into the right shape as I spent writing code. Mojo::DOM made it easy for me, a Mojolicious beginner, to get the results I wanted really quickly.

From Static Site to Static Site Generator

The problem I set out to solve was taking an old static website that was once hosted on and migrating it to an exciting website. But, this time, it'll be a modern take on a static website. Instead of editing HTML by hand and using home-built page munging scripts that would do things like insert news items or changelog entries at the top of the content div using regexes, I'll be using a modern static website generator. There are several to choose from, including the well-known Jekyll, which is written in Ruby, Hugo, built with Go, and Statocles, which is in Perl and runs this site. For my project, I chose Hugo, for its speed and maturity.

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Day 14: A Practical Example of Mojo::DOM

A typical industrial platform model overlaid with a laser scan

With recent versions of Mojolicious, Mojo::DOM gained a lot of power that I have been excited to try, but haven't had the time for. Recently, I had a problem at my real job (in Engineering, Procurement, and Construction, or EPC for short) that I solved with Mojo::DOM (and other parts of Mojolicious) in a very short time – including learning how to use Mojo::DOM, which I had never done before.

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