Feature Toggles! - Elixir

Feature toggles são uma técnica muito versátil para ajudar o trabalho de disponibilizar novas funcionalidades em produção sem quebrar a experiência de clientes e fazer entregas graduais, mas acabamos aprendendo sobre toggles de uma forma superficial no dia a dia.

Vamos ver um pouco do passado e presente do uso de features toggles, a sua facilidade de uso graças a ferramentas open source e considerações a serem feitas sobre como e quando usar toggles na sua aplicação

Transcript

1. Feature toggles
2. @lucasmazza https://afterhours.io
3. https://magnetis.workable.com
4. Feature Toggles 101
5. https://martinfowler.com/bliki/FeatureToggle.html
7. ❔
10. http://code.flickr.net/2009/12/02/flipping-out/ “Flickr is somewhat unique in that it uses a code repository with no branches; everything is checked into head, and head is pushed to production several times a day. ”
11. “Flags allow us to restrict features to certain environments, while still using the same code base on all servers.” http://code.flickr.net/2009/12/02/flipping-out/
12. “How do you use Continuous Integration to keep everyone working on the mainline without revealing a half- implemented feature on your releases? ” https://martinfowler.com/bliki/FeatureToggle.html
13. Trunk based development + Mudanças demoradas = FEATURE TOGGLEs
15. “Feature Toggles are a powerful technique, allowing teams to modify system behavior without changing code.” https://martinfowler.com/articles/feature-toggles.html
16. https://martinfowler.com/articles/feature-toggles.html
17. release toggles
18. ↗ ↘ ✅ ➡ ➡
19. ops toggles
20. ↗ ↘ ☁ ➡ ➡
21. http://confreaks.tv/videos/rubyconf2014-easy-rewrites-with-ruby-and-science
22. permission toggles
24. experiment toggles
25. https://martinfowler.com/articles/feature-toggles.html
27. NEW_SHINY_THING_ENABLED=1 mix phx.server
28. # config/toggles.yml development: shiny_new_thing: true production: shiny_new_thing: false
30. jnunemaker/flipper
31. ✋
32. tompave/fun_with_flags
33. def deps do [ {:fun_with_flags, "~> 1.0.0"}, {:redix, "~> 0.7"}, ] end
34. config :fun_with_flags, :persistence, [adapter: FunWithFlags.Store.Persistent.Redis] config :fun_with_flags, :redis, "redis://locahost:6379/0" config :fun_with_flags, :cache, enabled: true, ttl: 900 config :fun_with_flags, :cache_bust_notifications, enabled: true, adapter: FunWithFlags.Notifications.PhoenixPubSub, client: MyApp.PubSub
35. defmodule MyApp.DashboardController do use MyApp, :controller def show(conn, params) do if FunWithFlags.enabled?(:new_dashboard) do render conn, "new_dashboard.html" else render conn, "show.html" end end end
36. Redis / Ecto + ETS & Pubsub
37. Gates Boolean Actor Group % of Actors % of Time
38. boolean gate FunWithFlags.enabled?(:feature_name) # => false {:ok, true} = FunWithFlags.enable(:feature_name) FunWithFlags.enabled?(:feature_name) # => true
39. aCTOR gate defimpl FunWithFlags.Actor, for: MyApp.User do def id(%{id: id}) do "user:#{id}" end end FunWithFlags.enabled?(:feature_just_for_you, for: user) {:ok, true} = FunWithFlags.enable(:feature_just_for_you, for_actor: user)
40. GROUP gate defimpl FunWithFlags.Group, for: MyApp.User do def in?(%{staff: is_staff}, "staff_users"), do: !!is_staff end FunWithFlags.enabled?(:staff_panel, current_user) FunWithFlags.enable(:staff_panel, for_group: "staff_users")
41. GROUP gate defimpl FunWithFlags.Group, for: MyApp.User do def in?(%{staff: is_staff}, "staff_users"), do: !!is_staff end defimpl FunWithFlags.Group, for: MyApp.Client do def in?(%{subscription_plan: "premium"}, "premium_clients"), do: true end
42. % gates FunWithFlags.enable(:new_search, for_percentage_of: {:actors, 0.33}) FunWithFlags.enabled?(:new_search, for_actor: user_1) # => false FunWithFlags.enabled?(:new_search, for_actor: user_2) # => false FunWithFlags.enabled?(:new_search, for_actor: user_3) # => true FunWithFlags.enable(:v2_header, for_percentage_of: {:time, 0.50}) FunWithFlags.enabled?(:v2_header) # => false FunWithFlags.enabled?(:v2_header) # => true
43. UI
44. UI
45. UI defmodule MyApp.Web.Router do use MyApp.Web, :router pipeline :mounted_apps do plug :accepts, ["html"] plug :put_secure_browser_headers end scope path: "/feature-flags" do pipe_through :mounted_apps forward "/", FunWithFlags.UI.Router, namespace: "feature-flags" end end
48. “Release toggles are a useful technique and lots of teams use them. However they should be your last choice when you're dealing with putting features into production.” https://martinfowler.com/bliki/FeatureToggle.html
49. feature toggles são uma ferramenta de disponibilização de software
50. configurações da app não são toggles
51. configurações da app não são toggles toggle ou regra de negócio?
52. configurações da app não são toggles toggle ou regra de negócio? qual a diferença entre manter vs remover?
53. configurações da app não são toggles toggle ou regra de negócio? qual a diferença entre manter vs remover? será que não é só trauma de deploys ruins?
54. testes
55. testes servidores e clientes
56. testes servidores e clientes bancos de dados e serviços externos
57. feature toggles eventualmente são débitos técnicos
58. planejar e priorizar remoções
59. planejar e priorizar remoções testes de expiração
60. planejar e priorizar remoções testes de expiração limites de inventário
61. https://martinfowler.com/articles/feature-toggles.html
63. @lucasmazza https://speakerdeck.com/lucas Obrigado :)