Performance Em Aplicações Rails - Do jeito certo

Transcript

1. PERFORMANCE EM APLICAÇÕES RAILS Do jeito certo
4. MÉTRICAS
5. ANTES DE TUDO [métricas]
8. JUST DO IT
9. CACHING
10. HTTP CACHING
11. class ProductsController < ApplicationController def show @product = Product.find(params[:id]) # If the request is stale according to the given timestamp and etag value # (i.e. it needs to be processed again) then execute this block if stale?(last_modified: @product.updated_at.utc, etag: @product.cache_key) respond_to do |wants| # ... normal response processing end end # If the request is fresh (i.e. it's not modified) then you don't need to do # anything. The default render checks for this using the parameters # used in the previous call to stale? and will automatically send a # :not_modified. So that's it, you're done. end end
13. class ProductsController < ApplicationController def show @product = Product.find(params[:id]) if stale?(@product) respond_to do |wants| # ... normal response processing end end end end
14. FRAGMENT CACHING
15. <% Order.find_recent.each do |o| %> <%= o.buyer.name %> bought <%= o.product.name %> <% end %> <% cache do %> All available products: <% Product.all.each do |p| %> <%= link_to p.name, product_url(p) %> <% end %> <% end %>
16. <% cache("top_products", :expires_in => 1.hour) do %> <div id="topSellingProducts"> <% @recent_product = Product.order("units_sold DESC").limit(20) %> <%= render :partial => "product", :collection => @recent_products %> </div> <% end %>
17. LOW LEVEL CACHING
18. def Product.out_of_stock Rails.cache.fetch("out_of_stock_products", :expires_in => 5.minutes) do Product.all.joins(:inventory).conditions.where("inventory.quantity = 0") end end def competing_price Rails.cache.fetch("/product/#{id}-#{updated_at}/comp_price", :expires_in => 12.hours) do Competitor::API.find_price(id) end end
19. BONUS
20. https://github.com/cloudspace/ettu
21. class ProductsController < ApplicationController def show @product = Product.find(params[:id]) # Sugar syntax fresh_when @product # Hash syntax fresh_when etag: @product, last_modified: @product.updated_at, public: true end end
22. USE COM MODERAÇÃO!!
23. UPLOADS
28. # Gemfile gem ‘cloudinary’ gem ‘attachinary’
29. # config/cloudinary.yml production: cloud_name: "sample" api_key: "874837483274837" api_secret: "a676b67565c6767a6767d6767f676fe1"
30. # app/models/user.rb class User < ActiveRecord::Base attr_accessible :name has_attachment :avatar has_attachments :photos, maximum: 3 end
31. # app/controllers/users_controller.rb def create @user = User.new(params[:user]) @user.save! end
32. # app/views/users/_form.html.slim = form_for(@user) do |user_form| = user_form.text_field(:name) = attachinary_file_field_tag ‘user[avatar]', @user, :avatar = attachinary_file_field_tag ‘user[photos]’, @user, :photos = user_form.submit("Save")
33. # app/views/users/show.html.slim if user.avatar.present? = cl_image_tag(user.avatar.path, width: 80, height: 100, crop: :thumb, gravity: :face) - user.photos.each do |photo| = cl_image_tag(photo.path, size: '70x50', crop: :fill, radius: 20)
34. CDN
35. https://www.cloudflare.com/
37. DATABASE
38. USE POSTGRES ❤
39. INDEXES
40. https://github.com/plentz/lol_dba
41. rake db:find_indexes class AddMissingIndexes < ActiveRecord::Migration def change add_index :items, :user_id ... end end
42. N + 1
43. https://github.com/flyerhzm/bullet
44. N + 1 QUERIES #Articles model class Article < ActiveRecord::Base belongs_to :author end #Authors model class Author < ActiveRecord::Base has_many :posts end
45. N + 1 QUERIES #In our controller @recent_articles = Article.order(published_at: :desc).limit(5) #in our view file @recent_articles.each do |article| Title: <%= article.title %> Author:<%= article.author.name %> end
46. N + 1 QUERIES #In our controller #Using includes(:authors) will include authors model. @recent_articles = Article.order(published_at: :desc).includes(:authors).limit(5) #in our view file @recent_articles.each do |article| Title: <%= article.title %> Author:<%= article.author.name %> end
47. FOLLOWER DATABASES
48. https://devcenter.heroku.com/articles/heroku- postgres-follower-databases
49. https://github.com/tchandy/octopus
50. ASYNC JOBS
53. SIDEKIQ https://github.com/mperham/sidekiq
54. MEMÓRIA
55. DON’T LOAD OBJECTS INTO MEMORY UNLESS YOU NEED TO USE THEM
57. http://unicorn.bogomips.org/Unicorn/OobGC.html
59. BONUS
60. https://github.com/MiniProfiler/rack-mini-profiler
62. OBRIGADO!