kredis VS Puma

This is where Kredis, a Redis client for Ruby, comes into play, offering a powerful and efficient caching solution.

# Use the Puma web server [https://github.com/puma/puma] gem "puma", "~> 5.0" # Build JSON APIs with ease [https://github.com/rails/jbuilder] # gem "jbuilder" gem 'rack-cors' gem "devise" gem "jsonapi-serializer" gem 'devise-jwt' gem 'active_model_serializers' gem 'followability' gem 'dotenv-rails', groups: [:development, :test, :production] gem 'sprockets' # Use Redis adapter to run Action Cable in production # gem "redis", "~> 4.0" # Use Kredis to get higher-level data types in Redis [https://github.com/rails/kredis] # gem "kredis" # Use Active Model has_secure_password [https://guides.rubyonrails.org/active_model_basics.html#securepassword] # gem "bcrypt", "~> 3.1.7" # Windows does not include zoneinfo files, so bundle the tzinfo-data gem gem "tzinfo-data", platforms: %i[ mingw mswin x64_mingw jruby ] # Reduces boot times through caching; required in config/boot.rb gem "bootsnap", require: false # Use Active Storage variants [https://guides.rubyonrails.org/active_storage_overview.html#transforming-images] # gem "image_processing", "~> 1.2" # Use Rack CORS for handling Cross-Origin Resource Sharing (CORS), making cross-origin AJAX possible # gem "rack-cors" group :development, :test do # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem gem "debug", platforms: %i[ mri mingw x64_mingw ] end group :development do gem "sqlite3", "~> 1.4" # Speed up commands on slow machines / big apps [https://github.com/rails/spring] # gem "spring" end group :production do gem 'pg' end

Now the connection is complete, back to our use case where we want to save the onboarded status for each user. We will use kredis in this case to make our life easier by connecting redis database to the application model. Open the user model app/models/user.rb and then add the kredis_boolean attribute because the type we need is a boolean.

In rate_limited? the method request_counter is called which brings us to the part where Kredis is used. We use Kredis to initialize a counter in Redis. Kredis 'instantiates' the value from Redis. In other words, when you call Kredis.counter("mykey") we have an object that points to a Redis value under mykey. On that object we can call #increment which increments the current value in Redis. As you can see we check if the Redis key exists so that we can decide to use the call with expires_in. Each time you call #counter with expires_in, the expire timer resets. We don't want that because then the key will never expire. Checkout the Kredis docs for more information about Kredis.

Let's anwser those questions by making a simple live counter with Turbo Streams and Kredis.

Would Kredis be helpful?

Didn't know about `kredis_hash` I didn't look too hard at the gem when it was announced. Looks like there's more too, how convenient: https://github.com/rails/kredis/blob/main/lib/kredis/attributes.rb

Kredis is a new gem that makes it easier to work with Redis keys in Ruby on Rails. Kredis was added a suggested gem for new Rails applications starting with the release of Rails 7.0 in December of 2021 and is likely to become a larger force in the Rails world in the coming years.

kredis readme

As we use Puma as our webserver for our rails application, I quickly went to Puma's config file which typically resides in config/puma.rb. The config was set as

They do! It's in the first section of the readme on the repo:

Start with service with systemd

# Use the Puma web server [https://github.com/puma/puma] gem "puma", "~> 5.0" # Build JSON APIs with ease [https://github.com/rails/jbuilder] # gem "jbuilder" gem 'rack-cors' gem "devise" gem "jsonapi-serializer" gem 'devise-jwt' gem 'active_model_serializers' gem 'followability' gem 'dotenv-rails', groups: [:development, :test, :production] gem 'sprockets' # Use Redis adapter to run Action Cable in production # gem "redis", "~> 4.0" # Use Kredis to get higher-level data types in Redis [https://github.com/rails/kredis] # gem "kredis" # Use Active Model has_secure_password [https://guides.rubyonrails.org/active_model_basics.html#securepassword] # gem "bcrypt", "~> 3.1.7" # Windows does not include zoneinfo files, so bundle the tzinfo-data gem gem "tzinfo-data", platforms: %i[ mingw mswin x64_mingw jruby ] # Reduces boot times through caching; required in config/boot.rb gem "bootsnap", require: false # Use Active Storage variants [https://guides.rubyonrails.org/active_storage_overview.html#transforming-images] # gem "image_processing", "~> 1.2" # Use Rack CORS for handling Cross-Origin Resource Sharing (CORS), making cross-origin AJAX possible # gem "rack-cors" group :development, :test do # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem gem "debug", platforms: %i[ mri mingw x64_mingw ] end group :development do gem "sqlite3", "~> 1.4" # Speed up commands on slow machines / big apps [https://github.com/rails/spring] # gem "spring" end group :production do gem 'pg' end

source "https://rubygems.org" git_source(:github) { |repo| "https://github.com/#{repo}.git" } ruby "3.1.0" # Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main" gem "rails", "~> 7.0.4", ">= 7.0.4.2" # The original asset pipeline for Rails [https://github.com/rails/sprockets-rails] gem "sprockets-rails" # Use sqlite3 as the database for Active Record gem "sqlite3", "~> 1.4" # Use the Puma web server [https://github.com/puma/puma] gem "puma", "~> 5.0" # Use JavaScript with ESM import maps [https://github.com/rails/importmap-rails] gem "importmap-rails" # Hotwire's SPA-like page accelerator [https://turbo.hotwired.dev] gem "turbo-rails" # Hotwire's modest JavaScript framework [https://stimulus.hotwired.dev] gem "stimulus-rails" # Build JSON APIs with ease [https://github.com/rails/jbuilder] gem "jbuilder" gem "mongoid" gem "mongoid-grid_fs" gem 'bootstrap', '~> 5.2.2' #sourced from https://github.com/twbs/bootstrap-rubygem gem 'rack-cors' # Windows does not include zoneinfo files, so bundle the tzinfo-data gem gem "tzinfo-data", platforms: %i[ mingw mswin x64_mingw jruby ] # Reduces boot times through caching; required in config/boot.rb gem "bootsnap", require: false

That doesn't mean one excludes the other. Gems like Puma use the instance_eval method for their configuration file.

Anyway I did it: https://github.com/puma/puma/issues/3003 It's quite more complicated: https://github.com/puma/puma/issues/2999 A fix is in progress: https://github.com/puma/puma/pull/3002