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# cgi/session/memcached.rb - persistent storage of marshalled session data
#
# == Overview
#
# This file provides the CGI::Session::MemCache class, which builds
# persistence of storage data on top of the MemCache library. See
# cgi/session.rb for more details on session storage managers.
#
begin
require 'cgi/session'
require 'memcache'
class CGI
class Session
# MemCache-based session storage class.
#
# This builds upon the top-level MemCache class provided by the
# library file memcache.rb. Session data is marshalled and stored
# in a memcached cache.
class MemCacheStore
def check_id(id) #:nodoc:#
/[^0-9a-zA-Z]+/ =~ id.to_s ? false : true
end
# Create a new CGI::Session::MemCache instance
#
# This constructor is used internally by CGI::Session. The
# user does not generally need to call it directly.
#
# +session+ is the session for which this instance is being
# created. The session id must only contain alphanumeric
# characters; automatically generated session ids observe
# this requirement.
#
# +option+ is a hash of options for the initializer. The
# following options are recognized:
#
# cache:: an instance of a MemCache client to use as the
# session cache.
#
# This session's memcache entry will be created if it does
# not exist, or retrieved if it does.
def initialize(session, options = {})
id = session.session_id
unless check_id(id)
raise ArgumentError, "session_id '%s' is invalid" % id
end
@cache = options['cache'] || MemCache.new('localhost')
@session_key = "session:#{id}"
@hash = {}
end
# Restore session state from the session's memcache entry.
#
# Returns the session state as a hash.
def restore
begin
@hash = @cache[@session_key]
rescue
# Ignore session get failures.
end
@hash = {} unless @hash
@hash
end
# Save session state to the session's memcache entry.
def update
begin
@cache[@session_key] = @hash
rescue
# Ignore session update failures.
end
end
# Update and close the session's memcache entry.
def close
update
end
# Delete the session's memcache entry.
def delete
begin
@cache.delete(@session_key)
rescue
# Ignore session delete failures.
end
@hash = {}
end
end
end
end
rescue LoadError
# MemCache wasn't available so neither can the store be
end
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