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#
# cgi/session/pstore.rb - persistent storage of marshalled session data
#
# Documentation: William Webber (william@williamwebber.com)
#
# == Overview
#
# This file provides the CGI::Session::PStore class, which builds
# persistent of session data on top of the pstore library. See
# cgi/session.rb for more details on session storage managers.
require 'cgi/session'
require 'pstore'
class CGI
class Session
# PStore-based session storage class.
#
# This builds upon the top-level PStore class provided by the
# library file pstore.rb. Session data is marshalled and stored
# in a file. File locking and transaction services are provided.
class PStore
# Create a new CGI::Session::PStore 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 recognised:
#
# tmpdir:: the directory to use for storing the PStore
# file. Defaults to Dir::tmpdir (generally "/tmp"
# on Unix systems).
# prefix:: the prefix to add to the session id when generating
# the filename for this session's PStore file.
# Defaults to the empty string.
#
# This session's PStore file will be created if it does
# not exist, or opened if it does.
def initialize(session, option={})
dir = option['tmpdir'] || Dir::tmpdir
prefix = option['prefix'] || ''
id = session.session_id
require 'digest/md5'
md5 = Digest::MD5.hexdigest(id)[0,16]
path = dir+"/"+prefix+md5
path.untaint
if File::exist?(path)
@hash = nil
else
unless session.new_session
raise CGI::Session::NoSession, "uninitialized session"
end
@hash = {}
end
@p = ::PStore.new(path)
@p.transaction do |p|
File.chmod(0600, p.path)
end
end
# Restore session state from the session's PStore file.
#
# Returns the session state as a hash.
def restore
unless @hash
@p.transaction do
@hash = @p['hash'] || {}
end
end
@hash
end
# Save session state to the session's PStore file.
def update
@p.transaction do
@p['hash'] = @hash
end
end
# Update and close the session's PStore file.
def close
update
end
# Close and delete the session's PStore file.
def delete
path = @p.path
File::unlink path
end
end
end
end
# :enddoc:
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