The document outlines the benefits of using Ruby without Rails, highlighting alternatives such as Sinatra and Sequel for better performance and flexibility. It discusses the drawbacks of Rails, including its monolithic structure and slower speed, while providing examples of practical applications and code structures for building a lightweight Ruby web application. The document also includes technical specifics about project dependencies, database migrations, and server configuration.

1. Ruby w/o rails
Oleksandr Simonov

2. About me
• Name: Oleksandr Simonov
• Occupation: Founder and Owner of Amoniac
• Hobby: Open Source contribution
• Github: @simonoff

3. Why Ruby w/o Rails?
• Rails is a monolithic stone
• Rails is slow
• Rails force you to be a lazy

5. rails is:
• activerecord
• activemodel
• activesupport
• actionmailer
• actionpack
• actionview
• activejob
• railties

6. benchmark
http://www.madebymarket.com/blog/dev/ruby-web-
benchmark-report.html

7. Lazy Rails developer

8. Alternatives
• Rack
• Sinatra
• Cuba
• Grape (API)
• Reel
• Nahami
• Sequel
• ROM
WEB ORM

9. Advantages
• Faster then Rails
• Less time for app loading
• New knowledge

10. Disadvantages
• No Rails like console
• No Rails like code autoloading
• No Rails helpers
• No "Magic"
• More code

11. Practical section
• Download list of Finnish companies
• Insert/Update local DB
• On API call returns e-invoice address

13. - app
- models
- services
- workers
- config
- boot.rb
- initializers
- 01-dotenv.rb
- 02-airbrake.rb
- 03-sequel.rb
- 04-sidekiq.rb
- db
- migrations
- init.rb
- config.ru
Structure

14. require 'rubygems'
require 'bundler/setup'
require_relative 'init' # Application code loading
require 'sidekiq/web'
use Rack::ContentLength
use Rack::CommonLogger, ::NetvisorSpreadsheets.
logger # use own logger
use Rack::ShowExceptions
run Rack::URLMap.new('/' => ::NetvisorSpreadsheets:
:Server, '/sidekiq' =>
Sidekiq::Web)
config.ru

15. init.rb
# encoding: UTF-8
ENV['RACK_ENV'] ||= 'development' # default environment
require 'rubygems'
module NetvisorSpreadsheets # Singletone
extend self
attr_accessor :db
def root # helper for get application root path
@root_path ||= ::Pathname.new(::File.join(File.dirname(__FILE__))).expand_path
end
def env # helper for get environment
@env ||= ENV["RACK_ENV"] || "development"
end
def logger # helper for logger
@logger ||= ::Logger.new(self.root.join('log', "#{self.env}.log").to_s)
end
end
::NetvisorSpreadsheets.logger.level = if ::NetvisorSpreadsheets.env == 'production'
::Logger::INFO
else
::Logger::DEBUG
end
# require boot file
require self.root.join('config', 'boot.rb').to_s

16. $LOAD_PATH.unshift ::NetvisorSpreadsheets.root # add root path to load
path
# autoload some initializers, models, workers and services
def load_folder(*path)
::Dir.glob(::NetvisorSpreadsheets.root.join(*path)).each { |r| require
r }
end
load_folder('config', 'initializers', '**/*.rb')
load_folder('app', 'models', '**/*.rb')
load_folder('app', 'workers', '**/*.rb')
load_folder('app', 'services', '**/*.rb')
# require sinatra server code
require 'config/server'
boot.rb

17. source 'https://rubygems.org'
gem 'sqlite3'
gem 'dotenv'
gem 'sequel'
gem 'sinatra'
gem 'sinatra-contrib'
gem 'sidekiq'
gem 'airbrake'
gem 'puma'
gem 'sidekiq-cron', '~> 0.3', require: false
gem 'sidekiq-unique-jobs', '~> 4.0'
Gemfile

18. require 'rubygems'
require 'bundler/setup'
require 'sequel'
require 'dotenv'
require 'rake'
env = ENV['RACK_ENV'] || 'development'
namespace :db do
desc 'Run migrations'
task :migrate, [:version] do |_t, args|
::Dotenv.load(".env", ".env.#{env}")
::Sequel.extension :migration
db = ::Sequel.connect(::ENV.fetch('DATABASE_URL'))
if args[:version]
puts "Migrating to version #{args[:version]}"
::Sequel::Migrator.run(db, 'db/migrations', target: args[:version].to_i)
else
puts 'Migrating to latest'
::Sequel::Migrator.run(db, 'db/migrations')
end
end
end
Rakefile

19. ::Sequel.migration do
transaction
up do
create_table :companies do
primary_key :id
String :company_id, null: false, index: true
String :name, null: false
String :einvoice_address, null: false
String :einvoice_operator, null: false
end
end
down do
drop_table :companies
end
end
db/migrations/001_create_companies.rb

20. class CompanyUpdaterWorker
include ::Sidekiq::Worker
sidekiq_options unique: :while_executing
URL = "http://verkkolasku.tieke.fi/ExporVLOsoiteToExcel.aspx?type=csv"
def perform
path = ::Tempfile.new('vlo').path
if http_download_uri(::URI.parse(URL), path)
::NetvisorSpreadsheets::CompaniesFillerService.new(path).import
end
end
def http_download_uri(uri, filename)
begin
::Net::HTTP.new(uri.host, uri.port).start do |http|
http.request(Net::HTTP::Get.new(uri.request_uri)) do |response|
::File.open(filename, 'wb') do |io|
response.read_body { |chunk| io.write(chunk) }
end
end
end
rescue Exception => e
return false
end
true
end
end
companies_updater_worker.rb

21. companies_filler_service.rb
class CompanyUpdaterWorker
include ::Sidekiq::Worker
sidekiq_options unique: :while_executing
URL = "http://verkkolasku.tieke.fi/ExporVLOsoiteToExcel.aspx?type=csv"
def perform
path = ::Tempfile.new('vlo').path
if http_download_uri(::URI.parse(URL), path)
::NetvisorSpreadsheets::CompaniesFillerService.new(path).import
end
end
def http_download_uri(uri, filename)
begin
::Net::HTTP.new(uri.host, uri.port).start do |http|
http.request(Net::HTTP::Get.new(uri.request_uri)) do |response|
::File.open(filename, 'wb') do |io|
response.read_body { |chunk| io.write(chunk) }
end
end
end
rescue Exception => e
return false
end
true
end
end

22. require 'sinatra/base'
require 'sinatra/json'
module NetvisorSpreadsheets
class Server < Sinatra::Base
configure :production, :development do
enable :logging
set :json_encoder, :to_json
end
get '/' do
if params['company_id'] && params['company_id'].length > 0
json ::NetvisorSpreadsheets::CompanyFinderService.find(params['company_id'])
else
400
end
end
end
end
server.rb

24. What we get?
• Only 40Mb RAM
• 1 second app load
• Fast deployment

25. Questions