| # Author: Pieter Noordhuis | |
| # Description: Simple demo to showcase Redis PubSub with EventMachine | |
| # | |
| # Update 7 Oct 2010: | |
| # - This example does *not* appear to work with Chrome >=6.0. Apparently, | |
| # the WebSocket protocol implementation in the cramp gem does not work | |
| # well with Chrome's (newer) WebSocket implementation. | |
| # | |
| # Requirements: | |
| # - rubygems: eventmachine, thin, cramp, sinatra, yajl-ruby |
FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.
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.
| # THIS LINUX SETUP SCRIPT HAS MORPHED INTO A WHOLE PROJECT: HTTPS://OMAKUB.ORG | |
| # PLEASE CHECKOUT THAT PROJECT INSTEAD OF THIS OUTDATED SETUP SCRIPT. | |
| # | |
| # | |
| # Libraries and infrastructure | |
| sudo apt update -y | |
| sudo apt install -y \ | |
| docker.io docker-buildx \ | |
| build-essential pkg-config autoconf bison rustc cargo clang \ |