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module CacheableAttributes
extend ActiveSupport::Concern
included do
after_commit { self.class.expire }
end
class_methods do
# Can be overriden
def current_without_cache
last
end
def cache_key
"#{name}:#{Gitlab::VERSION}:#{Gitlab.migrations_hash}:json".freeze
end
def defaults
{}
end
def build_from_defaults(attributes = {})
new(defaults.merge(attributes))
end
def cached
json_attributes = Rails.cache.read(cache_key)
return nil unless json_attributes.present?
build_from_defaults(JSON.parse(json_attributes))
end
def current
cached_record = cached
return cached_record if cached_record.present?
current_without_cache.tap { |current_record| current_record&.cache! }
rescue
# Fall back to an uncached value if there are any problems (e.g. Redis down)
current_without_cache
end
def expire
Rails.cache.delete(cache_key)
rescue
# Gracefully handle when Redis is not available. For example,
# omnibus may fail here during gitlab:assets:compile.
end
end
def cache!
Rails.cache.write(self.class.cache_key, attributes.to_json)
end
end
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