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| | # AUTHOR: blink <blinketje@gmail.com>; blink#ruby-lang@irc.freenode.net
# THANKS:
# apeiros, for session id generation, expiry setup, and threadiness
# sergio, threadiness and bugreps
require 'rack/session/abstract/id'
require 'thread'
module Rack
module Session
# Rack::Session::Pool provides simple cookie based session management.
# Session data is stored in a hash held by @pool.
# In the context of a multithreaded environment, sessions being
# committed to the pool is done in a merging manner.
#
# The :drop option is available in rack.session.options if you wish to
# explicitly remove the session from the session cache.
#
# Example:
# myapp = MyRackApp.new
# sessioned = Rack::Session::Pool.new(myapp,
# :domain => 'foo.com',
# :expire_after => 2592000
# )
# Rack::Handler::WEBrick.run sessioned
class Pool < Abstract::ID
attr_reader :mutex, :pool
DEFAULT_OPTIONS = Abstract::ID::DEFAULT_OPTIONS.merge :drop => false
def initialize(app, options={})
super
@pool = Hash.new
@mutex = Mutex.new
end
def generate_sid
loop do
sid = super
break sid unless @pool.key? sid
end
end
def get_session(env, sid)
session = @pool[sid] if sid
@mutex.lock if env['rack.multithread']
unless sid and session
env['rack.errors'].puts("Session '#{sid.inspect}' not found, initializing...") if $VERBOSE and not sid.nil?
session = {}
sid = generate_sid
@pool.store sid, session
end
session.instance_variable_set('@old', {}.merge(session))
return [sid, session]
ensure
@mutex.unlock if env['rack.multithread']
end
def set_session(env, session_id, new_session, options)
@mutex.lock if env['rack.multithread']
session = @pool[session_id]
if options[:renew] or options[:drop]
@pool.delete session_id
return false if options[:drop]
session_id = generate_sid
@pool.store session_id, 0
end
old_session = new_session.instance_variable_get('@old') || {}
session = merge_sessions session_id, old_session, new_session, session
@pool.store session_id, session
return session_id
rescue
warn "#{new_session.inspect} has been lost."
warn $!.inspect
ensure
@mutex.unlock if env['rack.multithread']
end
private
def merge_sessions sid, old, new, cur=nil
cur ||= {}
unless Hash === old and Hash === new
warn 'Bad old or new sessions provided.'
return cur
end
delete = old.keys - new.keys
warn "//@#{sid}: dropping #{delete*','}" if $DEBUG and not delete.empty?
delete.each{|k| cur.delete k }
update = new.keys.select{|k| new[k] != old[k] }
warn "//@#{sid}: updating #{update*','}" if $DEBUG and not update.empty?
update.each{|k| cur[k] = new[k] }
cur
end
end
end
end
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