74 lines
2.6 KiB
Ruby
74 lines
2.6 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module Gitlab
|
|
class Experiment
|
|
module Rollout
|
|
class Feature < Percent
|
|
# For this rollout strategy to consider an experiment as enabled, we
|
|
# must:
|
|
#
|
|
# - have a feature flag yaml file that declares it.
|
|
# - be in an environment that permits it.
|
|
# - not have rolled out the feature flag at all (no percent of actors,
|
|
# no inclusions, etc.)
|
|
def enabled?
|
|
return false unless feature_flag_defined?
|
|
return false unless Gitlab.com?
|
|
return false unless ::Feature.enabled?(:gitlab_experiment, type: :ops)
|
|
|
|
feature_flag_instance.state != :off
|
|
end
|
|
|
|
# For assignment we first check to see if our feature flag is enabled
|
|
# for "self". This is done by calling `#flipper_id` (used behind the
|
|
# scenes by `Feature`). By default this is our `experiment.id` (or more
|
|
# specifically, the context key, which is an anonymous SHA generated
|
|
# using the details of an experiment.
|
|
#
|
|
# If the `Feature.enabled?` check is false, we return nil implicitly,
|
|
# which will assign the control. Otherwise we call super, which will
|
|
# assign a variant evenly, or based on our provided distribution rules.
|
|
def execute_assignment
|
|
super if ::Feature.enabled?(feature_flag_name, self, type: :experiment)
|
|
end
|
|
|
|
# This is what's provided to the `Feature.enabled?` call that will be
|
|
# used to determine experiment inclusion. An experiment may provide an
|
|
# override for this method to make the experiment work on user, group,
|
|
# or projects.
|
|
#
|
|
# For example, when running an experiment on a project, you could make
|
|
# the experiment assignable by project (using chatops) by implementing
|
|
# a `flipper_id` method in the experiment:
|
|
#
|
|
# def flipper_id
|
|
# context.project.flipper_id
|
|
# end
|
|
#
|
|
# Or even cleaner, simply delegate it:
|
|
#
|
|
# delegate :flipper_id, to: -> { context.project }
|
|
def flipper_id
|
|
return experiment.flipper_id if experiment.respond_to?(:flipper_id)
|
|
|
|
"Experiment;#{id}"
|
|
end
|
|
|
|
private
|
|
|
|
def feature_flag_instance
|
|
::Feature.get(feature_flag_name) # rubocop:disable Gitlab/AvoidFeatureGet
|
|
end
|
|
|
|
def feature_flag_defined?
|
|
::Feature::Definition.get(feature_flag_name).present?
|
|
end
|
|
|
|
def feature_flag_name
|
|
experiment.name.tr('/', '_')
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|