Feature Toggles! - Elixir

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Feature toggles

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@lucasmazza https://afterhours.io

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https://magnetis.workable.com

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Feature Toggles 101

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https://martinfowler.com/bliki/FeatureToggle.html

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❔

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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. ”

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“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/

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“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

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Trunk based development + Mudanças demoradas = FEATURE TOGGLEs

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“Feature Toggles are a powerful technique, allowing teams to modify system behavior without changing code.” https://martinfowler.com/articles/feature-toggles.html

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https://martinfowler.com/articles/feature-toggles.html

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release toggles

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↗ ↘ ✅ ➡ ➡

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ops toggles

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↗ ↘ ☁ ➡ ➡

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http://confreaks.tv/videos/rubyconf2014-easy-rewrites-with-ruby-and-science

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permission toggles

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experiment toggles

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https://martinfowler.com/articles/feature-toggles.html

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NEW_SHINY_THING_ENABLED=1 mix phx.server

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# config/toggles.yml development: shiny_new_thing: true production: shiny_new_thing: false

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jnunemaker/flipper

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✋

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tompave/fun_with_flags

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def deps do [ {:fun_with_flags, "~> 1.0.0"}, {:redix, "~> 0.7"}, ] end

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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

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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

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Redis / Ecto + ETS & Pubsub

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Gates Boolean Actor Group % of Actors % of Time

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boolean gate FunWithFlags.enabled?(:feature_name) # => false {:ok, true} = FunWithFlags.enable(:feature_name) FunWithFlags.enabled?(:feature_name) # => true

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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)

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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")

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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

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% 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

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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

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“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

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feature toggles são uma ferramenta de disponibilização de software

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conﬁgurações da app não são toggles

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conﬁgurações da app não são toggles toggle ou regra de negócio?

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conﬁgurações da app não são toggles toggle ou regra de negócio? qual a diferença entre manter vs remover?

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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?