require 'action_dispatch/middleware/session/abstract_store' module ActionDispatch module Session # A session store that uses an ActiveSupport::Cache::Store to store the sessions. This store is most useful # if you don't store critical data in your sessions and you don't need them to live for extended periods # of time. # # ==== Options # * cache - The cache to use. If it is not specified, Rails.cache will be used. # * expire_after - The length of time a session will be stored before automatically expiring. # By default, the :expires_in option of the cache is used. class CacheStore < AbstractStore def initialize(app, options = {}) @cache = options[:cache] || Rails.cache options[:expire_after] ||= @cache.options[:expires_in] super end # Get a session from the cache. def get_session(env, sid) unless sid and session = @cache.read(cache_key(sid)) sid, session = generate_sid, {} end [sid, session] end # Set a session in the cache. def set_session(env, sid, session, options) key = cache_key(sid) if session @cache.write(key, session, :expires_in => options[:expire_after]) else @cache.delete(key) end sid end # Remove a session from the cache. def destroy_session(env, sid, options) @cache.delete(cache_key(sid)) generate_sid end private # Turn the session id into a cache key. def cache_key(sid) "_session_id:#{sid}" end end end end