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module RedisCacheable
extend ActiveSupport::Concern
include Gitlab::Utils::StrongMemoize
CACHED_ATTRIBUTES_EXPIRY_TIME = 24.hours
class_methods do
def cached_attr_reader(*attributes)
attributes.each do |attribute|
define_method(attribute) do
unless self.has_attribute?(attribute)
raise ArgumentError, "`cached_attr_reader` requires the #{self.class.name}\##{attribute} attribute to have a database column"
end
cached_attribute(attribute) || read_attribute(attribute)
end
end
end
end
def cached_attribute(attribute)
cached_value = (cached_attributes || {})[attribute]
cast_value_from_cache(attribute, cached_value) if cached_value
end
def cache_attributes(values)
Gitlab::Redis::SharedState.with do |redis|
redis.set(cache_attribute_key, values.to_json, ex: CACHED_ATTRIBUTES_EXPIRY_TIME)
end
clear_memoization(:cached_attributes)
end
private
def cache_attribute_key
"cache:#{self.class.name}:#{self.id}:attributes"
end
def cached_attributes
strong_memoize(:cached_attributes) do
Gitlab::Redis::SharedState.with do |redis|
data = redis.get(cache_attribute_key)
JSON.parse(data, symbolize_names: true) if data
end
end
end
def cast_value_from_cache(attribute, value)
if Gitlab.rails5?
self.class.type_for_attribute(attribute).cast(value)
else
self.class.column_for_attribute(attribute).type_cast_from_database(value)
end
end
end
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