From: Carl Youngblood <carl@...>
Date: 2003-12-25T05:46:56+09:00
Subject: Drb session problem

I'm using DRb for my CGI session store class, as described on the Ruby 
Garden wiki here:

http://www.rubygarden.org/ruby?FCGIRubySessionHandling

I've created the session DRbStore class pretty much exactly as it is 
there.  Just to be precise, here is my DRbStore class:

------------------------------

require 'cgi/session'
require 'drb'

class CGI
   class Session
     class DRbStore
       DRb.start_service
       @@session_data = DRbObject.new(nil, 'druby://localhost:9192')

       def initialize(session, option=nil)
         @session_id = session.session_id
       end

       def restore
         @h = @@session_data[@session_id] || {}
       end

       def update
         @@session_data[@session_id] = @h
       end

       def close
       end

       def delete
         @@session_data.delete(@session_id)
       end
     end
   end
end

----------------------

And here is the DRb daemon that the DRbStore class accesses:

-------------------------

# This is a session storage daemon which can be shared by multiple FCGI
# processes. It's just a hash which is enabled for DRb access.

require 'drb'

session_data = Hash.new
DRb.start_service("druby://127.0.0.1:9192", session_data)
DRb.thread.join

--------------------------

And here is how I'm instantiating it:

--------------------------

@sess = CGI::Session.new(@cgi, 'database_manager' => CGI::Session::DRbStore)

--------------------------

That seems to succeed just fine, as long as I have the session daemon 
running, of course.  And then when I try to access a session variable 
like this:

somevar = @sess['data']

I get the following error (with stack trace):

....
/usr/local/lib/ruby/1.8/cgi/session.rb:80:in `[]'
/usr/local/lib/ruby/1.8/drb/drb.rb:407:in `method_missing'
/usr/local/lib/ruby/1.8/drb/drb.rb:451:in `open'
/usr/local/lib/ruby/1.8/drb/drb.rb:451:in `new'
/usr/local/lib/ruby/1.8/drb/drb.rb:468:in `initialize'
/usr/local/lib/ruby/1.8/drb/drb.rb:163:in `open'
/usr/local/lib/ruby/1.8/drb/drb.rb:163:in `each'
/usr/local/lib/ruby/1.8/drb/drb.rb:170:in `open'
druby://linux:35269 - #

It's like the daemon is returning an instance of DRbStore, instead of 
the hash it is supposed to contain.

Does anybody have any idea of what might be going wrong?

Thanks,
Carl Youngblood