277 lines
8.1 KiB
Ruby
277 lines
8.1 KiB
Ruby
# frozen_string_literal: true
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require 'flipper/adapters/active_record'
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require 'flipper/adapters/active_support_cache_store'
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class Feature
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# Classes to override flipper table names
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class FlipperFeature < Flipper::Adapters::ActiveRecord::Feature
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include DatabaseReflection
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# Using `self.table_name` won't work. ActiveRecord bug?
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superclass.table_name = 'features'
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def self.feature_names
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pluck(:key)
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end
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end
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class FlipperGate < Flipper::Adapters::ActiveRecord::Gate
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superclass.table_name = 'feature_gates'
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end
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# To enable EE overrides
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class ActiveSupportCacheStoreAdapter < Flipper::Adapters::ActiveSupportCacheStore
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end
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InvalidFeatureFlagError = Class.new(Exception) # rubocop:disable Lint/InheritException
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class << self
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delegate :group, to: :flipper
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def all
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flipper.features.to_a
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end
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def get(key)
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flipper.feature(key)
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end
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def persisted_names
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return [] unless ApplicationRecord.database.exists?
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# This loads names of all stored feature flags
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# and returns a stable Set in the following order:
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# - Memoized: using Gitlab::SafeRequestStore or @flipper
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# - L1: using Process cache
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# - L2: using Redis cache
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# - DB: using a single SQL query
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flipper.adapter.features
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end
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def persisted_name?(feature_name)
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# Flipper creates on-memory features when asked for a not-yet-created one.
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# If we want to check if a feature has been actually set, we look for it
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# on the persisted features list.
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persisted_names.include?(feature_name.to_s)
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end
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# use `default_enabled: true` to default the flag to being `enabled`
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# unless set explicitly. The default is `disabled`
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# TODO: remove the `default_enabled:` and read it from the `definition_yaml`
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# check: https://gitlab.com/gitlab-org/gitlab/-/issues/30228
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def enabled?(key, thing = nil, type: :development, default_enabled: false)
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if check_feature_flags_definition?
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if thing && !thing.respond_to?(:flipper_id)
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raise InvalidFeatureFlagError,
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"The thing '#{thing.class.name}' for feature flag '#{key}' needs to include `FeatureGate` or implement `flipper_id`"
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end
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Feature::Definition.valid_usage!(key, type: type, default_enabled: default_enabled)
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end
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# If `default_enabled: :yaml` we fetch the value from the YAML definition instead.
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default_enabled = Feature::Definition.default_enabled?(key) if default_enabled == :yaml
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# During setup the database does not exist yet. So we haven't stored a value
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# for the feature yet and return the default.
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return default_enabled unless ApplicationRecord.database.exists?
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feature = get(key)
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# If we're not default enabling the flag or the feature has been set, always evaluate.
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# `persisted?` can potentially generate DB queries and also checks for inclusion
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# in an array of feature names (177 at last count), possibly reducing performance by half.
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# So we only perform the `persisted` check if `default_enabled: true`
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feature_value = !default_enabled || Feature.persisted_name?(feature.name) ? feature.enabled?(thing) : true
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# If we don't filter out this flag here we will enter an infinite loop
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log_feature_flag_state(key, feature_value) if log_feature_flag_states?(key)
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feature_value
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end
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def disabled?(key, thing = nil, type: :development, default_enabled: false)
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# we need to make different method calls to make it easy to mock / define expectations in test mode
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thing.nil? ? !enabled?(key, type: type, default_enabled: default_enabled) : !enabled?(key, thing, type: type, default_enabled: default_enabled)
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end
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def enable(key, thing = true)
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log(key: key, action: __method__, thing: thing)
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get(key).enable(thing)
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end
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def disable(key, thing = false)
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log(key: key, action: __method__, thing: thing)
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get(key).disable(thing)
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end
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def enable_percentage_of_time(key, percentage)
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log(key: key, action: __method__, percentage: percentage)
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get(key).enable_percentage_of_time(percentage)
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end
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def disable_percentage_of_time(key)
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log(key: key, action: __method__)
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get(key).disable_percentage_of_time
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end
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def enable_percentage_of_actors(key, percentage)
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log(key: key, action: __method__, percentage: percentage)
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get(key).enable_percentage_of_actors(percentage)
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end
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def disable_percentage_of_actors(key)
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log(key: key, action: __method__)
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get(key).disable_percentage_of_actors
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end
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def remove(key)
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return unless persisted_name?(key)
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log(key: key, action: __method__)
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get(key).remove
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end
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def reset
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Gitlab::SafeRequestStore.delete(:flipper) if Gitlab::SafeRequestStore.active?
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@flipper = nil
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end
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# This method is called from config/initializers/flipper.rb and can be used
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# to register Flipper groups.
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# See https://docs.gitlab.com/ee/development/feature_flags/index.html
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def register_feature_groups
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end
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def register_definitions
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Feature::Definition.reload!
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end
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def register_hot_reloader
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return unless check_feature_flags_definition?
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Feature::Definition.register_hot_reloader!
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end
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def logger
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@logger ||= Feature::Logger.build
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end
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def log_feature_flag_states?(key)
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Feature::Definition.log_states?(key)
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end
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def log_feature_flag_state(key, feature_value)
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logged_states[key] ||= feature_value
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end
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def logged_states
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RequestStore.fetch(:feature_flag_events) { {} }
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end
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private
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def flipper
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if Gitlab::SafeRequestStore.active?
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Gitlab::SafeRequestStore[:flipper] ||= build_flipper_instance(memoize: true)
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else
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@flipper ||= build_flipper_instance
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end
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end
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def build_flipper_instance(memoize: false)
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active_record_adapter = Flipper::Adapters::ActiveRecord.new(
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feature_class: FlipperFeature,
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gate_class: FlipperGate)
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# Redis L2 cache
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redis_cache_adapter =
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ActiveSupportCacheStoreAdapter.new(
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active_record_adapter,
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l2_cache_backend,
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expires_in: 1.hour,
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write_through: true)
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# Thread-local L1 cache: use a short timeout since we don't have a
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# way to expire this cache all at once
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flipper_adapter = Flipper::Adapters::ActiveSupportCacheStore.new(
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redis_cache_adapter,
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l1_cache_backend,
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expires_in: 1.minute)
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Flipper.new(flipper_adapter).tap do |flip|
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flip.memoize = memoize
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end
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end
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def check_feature_flags_definition?
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# We want to check feature flags usage only when
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# running in development or test environment
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Gitlab.dev_or_test_env?
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end
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def l1_cache_backend
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Gitlab::ProcessMemoryCache.cache_backend
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end
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def l2_cache_backend
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Rails.cache
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end
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def log(key:, action:, **extra)
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extra ||= {}
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extra = extra.transform_keys { |k| "extra.#{k}" }
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extra = extra.transform_values { |v| v.respond_to?(:flipper_id) ? v.flipper_id : v }
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extra = extra.transform_values(&:to_s)
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logger.info(key: key, action: action, **extra)
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end
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end
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class Target
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attr_reader :params
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def initialize(params)
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@params = params
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end
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def gate_specified?
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%i(user project group feature_group).any? { |key| params.key?(key) }
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end
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def targets
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[feature_group, user, project, group].compact
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end
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private
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# rubocop: disable CodeReuse/ActiveRecord
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def feature_group
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return unless params.key?(:feature_group)
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Feature.group(params[:feature_group])
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end
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# rubocop: enable CodeReuse/ActiveRecord
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def user
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return unless params.key?(:user)
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UserFinder.new(params[:user]).find_by_username!
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end
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def project
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return unless params.key?(:project)
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Project.find_by_full_path(params[:project])
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end
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def group
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return unless params.key?(:group)
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Group.find_by_full_path(params[:group])
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end
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end
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end
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Feature::ActiveSupportCacheStoreAdapter.prepend_mod_with('Feature::ActiveSupportCacheStoreAdapter')
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