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# frozen_string_literal: true
module Gitlab
module RackAttack
# This class is a proxy for all Redis calls made by RackAttack. All the
# calls are instrumented, then redirected to ::Rails.cache. This class
# instruments the standard interfaces of ActiveRecord::Cache defined in
# https://github.com/rails/rails/blob/v6.0.3.1/activesupport/lib/active_support/cache.rb#L315
#
# For more information, please see
# https://gitlab.com/gitlab-com/gl-infra/scalability/-/issues/751
class InstrumentedCacheStore
NOTIFICATION_CHANNEL = 'redis.rack_attack'
delegate :silence!, :mute, to: :@upstream_store
def initialize(upstream_store: ::Rails.cache, notifier: ActiveSupport::Notifications)
@upstream_store = upstream_store
@notifier = notifier
end
[:fetch, :read, :read_multi, :write_multi, :fetch_multi, :write, :delete,
:exist?, :delete_matched, :increment, :decrement, :cleanup, :clear].each do |interface|
define_method interface do |*args, **k_args, &block|
@notifier.instrument(NOTIFICATION_CHANNEL, operation: interface) do
@upstream_store.public_send(interface, *args, **k_args, &block) # rubocop:disable GitlabSecurity/PublicSend
end
end
end
end
end
end
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