Lotus - Speaker Deck

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Lotus A c o mp l e t e web framework @jodosha / #lotusrb

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Do we need yet another web framework?

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Are you reinventing the wheel?

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What if we never reinvented the wheel?

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The wheel

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We reinvented the wheel after observing it

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Complexity should be managed, not hidden.

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Why does this matter?

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The ultimate goal is…

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Money https://ﬂic.kr/p/aFAEHR

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Use case: http://bit.ly/github-rails-upgrade

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We should not trade control for convenience.

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Cost of maintenance 0 20 40 60 80 Years 0 1 2 3 Covenience Simplicity

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Silver bullets are a lie.

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Philosophy

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Standalone frameworks

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Full stack applications

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Few conventions More objects No monkey- patching

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Few conventions More objects No monkey- patching

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Few conventions More objects No monkey- patching

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Simple

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Simplicity is achieved by removing what isn’t essential

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Coﬀee https://ﬂic.kr/p/6rX8pn

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Convenient https://ﬂic.kr/p/93Bk4K

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Simple https://ﬂic.kr/p/mn57Zm

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The output https://ﬂic.kr/p/9oG93w

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Lotus doesn’t enable optional features by default

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We perceive as simple the things we are familiar with

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BookRepository.find 23

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Rails.application.routes.draw do get '/' => 'home#index', as: :home resources :books end ! Rails.application.routes # => ???

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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

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Fast

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Micro benchmarks http://bit.ly/lotus-micro-bench

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HTTP benchmarks http://bit.ly/lotus-http-bench

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Rails 1027.73 Sinatra 2207.73 Lotus 4175.90 http://bit.ly/lotus-http-bench req/s

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Rails 1027.73 Sinatra 2207.73 Lotus 4175.90 http://bit.ly/lotus-http-bench req/s

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Rails 1027.73 Sinatra 2207.73 Lotus 4175.90 http://bit.ly/lotus-http-bench req/s

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Testable

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Testability is a virtue

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There is no “test-damaged” design

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class Show include Lotus::Action ! expose :book ! def initialize(repository = BooksRepository) @repository = repository end ! def call(params) @book = @repository.find params[:id] end end

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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