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Luca Guidi
October 14, 2014
Programming
8
530
Lotus
Lotus: a complete web framework for Ruby.
Luca Guidi
October 14, 2014
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Transcript
Lotus A c o mp l e t e web
framework @jodosha / #lotusrb
None
Do we need yet another web framework?
Are you reinventing the wheel?
What if we never reinvented the wheel?
The wheel
None
We reinvented the wheel after observing it
Complexity should be managed, not hidden.
Why does this matter?
The ultimate goal is…
Money https://flic.kr/p/aFAEHR
Use case: http://bit.ly/github-rails-upgrade
We should not trade control for convenience.
Cost of maintenance 0 20 40 60 80 Years 0
1 2 3 Covenience Simplicity
Silver bullets are a lie.
Philosophy
Standalone frameworks
Full stack applications
Few conventions More objects No monkey- patching
Few conventions More objects No monkey- patching
Few conventions More objects No monkey- patching
Simple
Simplicity is achieved by removing what isn’t essential
Coffee https://flic.kr/p/6rX8pn
Convenient https://flic.kr/p/93Bk4K
Simple https://flic.kr/p/mn57Zm
The output https://flic.kr/p/9oG93w
Lotus doesn’t enable optional features by default
We perceive as simple the things we are familiar with
BookRepository.find 23
Rails.application.routes.draw do get '/' => 'home#index', as: :home resources :books
end ! Rails.application.routes # => ???
router = Lotus::Router.new do get '/', to: 'home#index', as: :home
resources :books end ! router.path(:home) # => '/' router.call(env) # Rack env run router # in config.ru
Fast
Micro benchmarks http://bit.ly/lotus-micro-bench
HTTP benchmarks http://bit.ly/lotus-http-bench
Rails 1027.73 Sinatra 2207.73 Lotus 4175.90 http://bit.ly/lotus-http-bench req/s
Rails 1027.73 Sinatra 2207.73 Lotus 4175.90 http://bit.ly/lotus-http-bench req/s
Rails 1027.73 Sinatra 2207.73 Lotus 4175.90 http://bit.ly/lotus-http-bench req/s
Testable
Testability is a virtue
There is no “test-damaged” design
class Show include Lotus::Action ! expose :book ! def initialize(repository
= BooksRepository) @repository = repository end ! def call(params) @book = @repository.find params[:id] end end
book = Object.new repository = Minitest::Mock.new repository.expect(:find, book, [Integer]) !
action = Show.new(repository) action.call(id: 23) # => [200, {}, nil] ! repository.verify action.book.must_equal book # assigns(:book) isn’t needed
Demo
The future
Get involved
lotusrb.org #lotusrb @jodosha
Q&A
Thank you!