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# frozen_string_literal: true
# Extend the Feature class with the ability to stub feature flags.
module StubbedFeature
extend ActiveSupport::Concern
prepended do
cattr_reader(:persist_used) do
# persist feature flags in CI
# nil: indicates that we do not want to persist used feature flags
Gitlab::Utils.to_boolean(ENV['CI']) ? {} : nil
end
end
class_methods do
# Turn stubbed feature flags on or off.
def stub=(stub)
@stub = stub
end
def stub?
@stub.nil? ? true : @stub
end
# Wipe any previously set feature flags.
def reset_flipper
@flipper = nil
end
# Replace #flipper method with the optional stubbed/unstubbed version.
def flipper
if stub?
@flipper ||= Flipper.new(Flipper::Adapters::Memory.new)
else
super
end
end
# Replace #enabled? method with the optional stubbed/unstubbed version.
def enabled?(*args, **kwargs)
feature_flag = super
return feature_flag unless stub?
persist_used!(args.first)
# If feature flag is not persisted we mark the feature flag as enabled
# We do `m.call` as we want to validate the execution of method arguments
# and a feature flag state if it is not persisted
unless Feature.persisted_name?(args.first)
feature_flag = true
end
feature_flag
end
# This method creates a temporary file in `tmp/feature_flags`
# if feature flag was touched during execution
def persist_used!(name)
return unless persist_used
return if persist_used[name]
persist_used[name] = true
FileUtils.touch(
Rails.root.join('tmp', 'feature_flags', name.to_s + ".used")
)
end
end
end
|
