artsy/garner

# Set up Garner configuration parameters
Garner.config.option(:context_key_strategies,
                     default: [Garner::Strategies::Context::Key::Caller]
                    )
Garner.config.option(:rack_context_key_strategies,
                     default: [
                       Garner::Strategies::Context::Key::Caller,
                       Garner::Strategies::Context::Key::RequestGet,
                       Garner::Strategies::Context::Key::RequestPost,
                       Garner::Strategies::Context::Key::RequestPath
                     ]
                    )

module Garner
  module Cache
    module Context
      # Instantiate a context-appropriate cache identity.
      #
      # @example
      #   garner.bind(current_user) do
      #     { count: current_user.logins.count }
      #   end
      # @return [Garner::Cache::Identity] The cache identity.
      def garner(&block)
        identity = Garner::Cache::Identity.new(self)
        Garner.config.context_key_strategies.each do |strategy|
          identity = strategy.apply(identity, self)
        end

        block_given? ? identity.fetch(&block) : identity
      end
    end
  end
end