# 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)
with_lock(env) do
unless sid and session = @pool[sid]
sid, session = generate_sid, {}
@pool.store sid, session
end
[sid, session]
end
end
def set_session(env, session_id, new_session, options)
with_lock(env) do
@pool.store session_id, new_session
session_id
end
end
def destroy_session(env, session_id, options)
with_lock(env) do
@pool.delete(session_id)
generate_sid unless options[:drop]
end
end
def with_lock(env)
@mutex.lock if env['rack.multithread']
yield
ensure
@mutex.unlock if @mutex.locked?
end
end
end
end
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