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# frozen_string_literal: true
require 'flipper/adapters/active_record'
require 'flipper/adapters/active_support_cache_store'
class Feature
prepend_if_ee('EE::Feature') # rubocop: disable Cop/InjectEnterpriseEditionModule
# Classes to override flipper table names
class FlipperFeature < Flipper::Adapters::ActiveRecord::Feature
# Using `self.table_name` won't work. ActiveRecord bug?
superclass.table_name = 'features'
def self.feature_names
pluck(:key)
end
end
class FlipperGate < Flipper::Adapters::ActiveRecord::Gate
superclass.table_name = 'feature_gates'
end
class << self
delegate :group, to: :flipper
def all
flipper.features.to_a
end
def get(key)
flipper.feature(key)
end
def persisted_names
return [] unless Gitlab::Database.exists?
Gitlab::SafeRequestStore[:flipper_persisted_names] ||=
begin
# We saw on GitLab.com, this database request was called 2300
# times/s. Let's cache it for a minute to avoid that load.
Gitlab::ProcessMemoryCache.cache_backend.fetch('flipper:persisted_names', expires_in: 1.minute) do
FlipperFeature.feature_names
end
end
end
def persisted?(feature)
# Flipper creates on-memory features when asked for a not-yet-created one.
# If we want to check if a feature has been actually set, we look for it
# on the persisted features list.
persisted_names.include?(feature.name.to_s)
end
# use `default_enabled: true` to default the flag to being `enabled`
# unless set explicitly. The default is `disabled`
def enabled?(key, thing = nil, default_enabled: false)
# During setup the database does not exist yet. So we haven't stored a value
# for the feature yet and return the default.
return default_enabled unless Gitlab::Database.exists?
feature = Feature.get(key)
# If we're not default enabling the flag or the feature has been set, always evaluate.
# `persisted?` can potentially generate DB queries and also checks for inclusion
# in an array of feature names (177 at last count), possibly reducing performance by half.
# So we only perform the `persisted` check if `default_enabled: true`
!default_enabled || Feature.persisted?(feature) ? feature.enabled?(thing) : true
end
def disabled?(key, thing = nil, default_enabled: false)
# we need to make different method calls to make it easy to mock / define expectations in test mode
thing.nil? ? !enabled?(key, default_enabled: default_enabled) : !enabled?(key, thing, default_enabled: default_enabled)
end
def enable(key, thing = true)
get(key).enable(thing)
end
def disable(key, thing = false)
get(key).disable(thing)
end
def enable_group(key, group)
get(key).enable_group(group)
end
def disable_group(key, group)
get(key).disable_group(group)
end
def remove(key)
feature = get(key)
return unless persisted?(feature)
feature.remove
end
def flipper
if Gitlab::SafeRequestStore.active?
Gitlab::SafeRequestStore[:flipper] ||= build_flipper_instance
else
@flipper ||= build_flipper_instance
end
end
def build_flipper_instance
Flipper.new(flipper_adapter).tap { |flip| flip.memoize = true }
end
# This method is called from config/initializers/flipper.rb and can be used
# to register Flipper groups.
# See https://docs.gitlab.com/ee/development/feature_flags.html#feature-groups
def register_feature_groups
end
def flipper_adapter
active_record_adapter = Flipper::Adapters::ActiveRecord.new(
feature_class: FlipperFeature,
gate_class: FlipperGate)
# Redis L2 cache
redis_cache_adapter =
Flipper::Adapters::ActiveSupportCacheStore.new(
active_record_adapter,
l2_cache_backend,
expires_in: 1.hour)
# Thread-local L1 cache: use a short timeout since we don't have a
# way to expire this cache all at once
Flipper::Adapters::ActiveSupportCacheStore.new(
redis_cache_adapter,
l1_cache_backend,
expires_in: 1.minute)
end
def l1_cache_backend
Gitlab::ProcessMemoryCache.cache_backend
end
def l2_cache_backend
Rails.cache
end
end
class Target
attr_reader :params
def initialize(params)
@params = params
end
def gate_specified?
%i(user project group feature_group).any? { |key| params.key?(key) }
end
def targets
[feature_group, user, project, group].compact
end
private
# rubocop: disable CodeReuse/ActiveRecord
def feature_group
return unless params.key?(:feature_group)
Feature.group(params[:feature_group])
end
# rubocop: enable CodeReuse/ActiveRecord
def user
return unless params.key?(:user)
UserFinder.new(params[:user]).find_by_username!
end
def project
return unless params.key?(:project)
Project.find_by_full_path(params[:project])
end
def group
return unless params.key?(:group)
Group.find_by_full_path(params[:group])
end
end
end
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