Release new features using feature sliders

A presentation of the arturo gem

Transcript

1. Release new features
   using feature sliders
   Dimiter Petrov
   @crackofdusk
   20 November 2013
   

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2. Introduction
   

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3. A feature can be too large for a single
   development cycle
   

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4. A feature may need testing by a small
   group before being deployed to all users
   

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5. You need fine-grained control over
   feature deployment
   

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6. Feature sliders
   

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7. Feature sliders
   Turn on and off features for some of the
   users
   

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8. Feature sliders with the
   arturo gem
   

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9. Integrating arturo in your
   application
   1. Create migration for features table
   2. Add configuration initializer
   3. Mount arturo engine in the router
   4. Run migration
   5. Use arturo helpers to wrap features
   

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10. Features table
    Needs a column for feature names and a
    column for deployment percentage
    

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11. Deployment percentage?
    Feature X can be deployed to m percent of
    the users
    

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12. Deployment percentage?
    Feature X can be deployed to m percent of
    the users
    Deterministic: a feature is consistently
    enabled from now on for that m percent of
    users unless you decrease the deployment
    percentage.
    

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13. Feature conditionals
    

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14. Controller filters
    class ReservationsController < ApplicationController
    require_feature :reserve_table
    end
    

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15. Conditional evaluation
    def widgets_for_sidebar
    widgets = []
    widgets <<
    twitter_widget if feature_enabled?(:tweeting)
    # ...
    widgets
    end
    

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16. Conditional evaluation
    <% if_feature_enabled(:reserve_table) %>
    <%=
    link_to
    ’Reserve a table’,
    new_restaurant_reservation_path(restaurant)
    %>
    <% end %>
    

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17. Feature conditionals
    oustide controllers
    Arturo.feature_enabled_for?(:reserve_table, recipient)
    Arturo.reserve_table_enabled_for?(recepient)
    

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18. Fine-grained control
    

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19. Whitelists & blacklists
    # config/initializers/arturo_initializer.rb
    Arturo::Feature.whitelist(:awesome) do |user|
    user.account.premium?
    end
    Arturo::Feature.blacklist(:goodies) do |user|
    user.account.free?
    end
    

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20. Feature recepients
    The current “thing” that is in the category
    thatisthebasisfordeployingnewfeatures.
    E.g: a user, an account, a project, a venue,…
    

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21. Feature recepients
    # config/initializers/arturo_initializer.rb
    Arturo.feature_recipient do
    current_project
    end
    

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22. Feature administration
    

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23. Feature administration
    Navigate to /features and manage
    features from the mounted rails engine
    

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24. Administration permissions
    # Default permissions
    current_user.present? && current_user.admin?
    

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25. Administration permissions
    # Default permissions
    current_user.present? && current_user.admin?
    # config/initializers/arturo_initializer.rb
    Arturo.permit_management do
    signed_in? && current_user.can?(:manage_features)
    end
    

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26. Live demo
    https://github.com/happydawn/arturo-test
    

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27. Thank you!
    

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