DigitalHobbit
Thoughts from the Hobbit Hole
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Rails, Facebooker, and memcached Session Store
Posted on February 28th, 2009 No commentsWe’re using Facebooker for our Rails based Facebook apps. However, we ran into a problem after migrating our session store to the MemCacheStore. Every request was producing the following stacktrace:
/!\ FAILSAFE /!\ Sat Feb 28 10:24:09 -0800 2009 Status: 500 Internal Server Error session_id '2.wYavYw2U9jBTnFOcX9rjMw__.86400.1235934000-1023424742' is invalid /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/session/mem_cache_store.rb:54:in `initialize' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/cgi/session.rb:273:in `new' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/cgi/session.rb:273:in `initialize_without_cgi_reader' /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/cgi_ext/session.rb:19:in `initialize_aliased_by_facebooker' /Users/mirko/Work/questionx/vendor/plugins/facebooker/lib/facebooker/rails/facebook_session_handling.rb:35:in `initialize' /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/cgi_process.rb:94:in `new'It turns out that Facebook session ids include dots and underscores, which the MemCacheStore chokes on. Luckily I came across this forum post. The solution below is based on the approach outlined in the post, with a few modifications to more cleanly hook the patch into the method chain rather than replacing the original functionality completely. Simply drop the code below into an initializer (e.g.
config/initializers/facebooker_memcache_session_patch.rb):class CGI class Session class MemCacheStore def check_id_with_strip_fb_chars(id) check_id_without_strip_fb_chars(id.gsub(/[-\._]/, '')) end alias_method_chain :check_id, :strip_fb_chars end end end
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