119 lines
3.1 KiB
Ruby
119 lines
3.1 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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class JsonCache
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attr_reader :backend, :namespace
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STRATEGY_KEY_COMPONENTS = {
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revision: Gitlab.revision,
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version: [Gitlab::VERSION, Rails.version]
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}.freeze
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def initialize(options = {})
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@backend = options.fetch(:backend, Rails.cache)
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@namespace = options.fetch(:namespace, nil)
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@cache_key_strategy = options.fetch(:cache_key_strategy, :revision)
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end
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def active?
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if backend.respond_to?(:active?)
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backend.active?
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else
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true
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end
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end
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def cache_key(key)
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expanded_cache_key = [namespace, key, *strategy_key_component].compact
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expanded_cache_key.join(':').freeze
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end
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def strategy_key_component
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STRATEGY_KEY_COMPONENTS.fetch(@cache_key_strategy)
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end
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def expire(key)
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backend.delete(cache_key(key))
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end
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def read(key, klass = nil)
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value = backend.read(cache_key(key))
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value = parse_value(value, klass) unless value.nil?
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value
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end
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def write(key, value, options = nil)
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backend.write(cache_key(key), value.to_json, options)
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end
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def fetch(key, options = {}, &block)
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klass = options.delete(:as)
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value = read(key, klass)
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return value unless value.nil?
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value = yield
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write(key, value, options)
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value
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end
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private
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def parse_value(raw, klass)
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value = Gitlab::Json.parse(raw.to_s)
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case value
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when Hash then parse_entry(value, klass)
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when Array then parse_entries(value, klass)
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else
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value
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end
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rescue JSON::ParserError
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nil
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end
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def parse_entry(raw, klass)
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return unless valid_entry?(raw, klass)
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return klass.new(raw) unless klass.ancestors.include?(ActiveRecord::Base)
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# When the cached value is a persisted instance of ActiveRecord::Base in
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# some cases a relation can return an empty collection becauses scope.none!
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# is being applied on ActiveRecord::Associations::CollectionAssociation#scope
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# when the new_record? method incorrectly returns false.
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#
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# See https://gitlab.com/gitlab-org/gitlab/issues/9903#note_145329964
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klass.allocate.init_with(encode_for(klass, raw))
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end
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def encode_for(klass, raw)
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# We have models that leave out some fields from the JSON export for
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# security reasons, e.g. models that include the CacheMarkdownField.
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# The ActiveRecord::AttributeSet we build from raw does know about
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# these columns so we need manually set them.
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missing_attributes = (klass.columns.map(&:name) - raw.keys)
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missing_attributes.each { |column| raw[column] = nil }
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coder = {}
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klass.new(raw).encode_with(coder)
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coder["new_record"] = new_record?(raw, klass)
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coder
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end
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def new_record?(raw, klass)
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raw.fetch(klass.primary_key, nil).blank?
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end
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def valid_entry?(raw, klass)
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return false unless klass && raw.is_a?(Hash)
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(raw.keys - klass.attribute_names).empty?
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end
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def parse_entries(values, klass)
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values.map { |value| parse_entry(value, klass) }.compact
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end
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end
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end
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