Доповідь про веб на Ruby без Rails, без "магії" та AR. Практичні приклади як зробити роботу без Rails зручнішою для Rails developer.

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