At CARTO, among other things, we render maps, just check this example of Map with countries and USA states.

In order to limit the scope of the challenge, we are gonna use Mapnik and Node.js. Within this repository, we are providing all the pieces you need to reproduce that map. Well, all pieces except the map tile server.

An example of how to create an image with Mapnik:

The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.

In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.

This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.