Restore session in CherryPy by specific id - session

Question

I am doing a RESTful web service by CherryPy. Since the client is not always a browser and may not be able to store cookie, so I plan to get CherryPy's session id and pass it via HTTP GET/POST as a token. When client send request with this token(session id) to CherryPy it could restore session just like what cookie does and the server side can get authentication or any stateful data.
My question is, how to restore the CherryPy session by specific id?

Answer 1

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import cherrypy.lib
config = {
'global' : {
'server.socket_host' : '127.0.0.1',
'server.socket_port' : 8080,
'server.thread_pool' : 4
}
}
class App:
#cherrypy.expose
#cherrypy.config(**{'tools.sessions.on': True})
def counter(self):
if 'counter' not in cherrypy.session:
cherrypy.session['counter'] = 0
cherrypy.session['counter'] += 1
return 'Counter: {0}<br/>Session key: {1}'.format(
cherrypy.session['counter'],
cherrypy.request.cookie['session_id'].value
)
#cherrypy.expose
def recreate(self, token):
'''You can try open it from another browser
once set the value in /counter
'''
cherrypy.request.cookie['session_id'] = token
cherrypy.lib.sessions.init()
# now it should be ready
return 'Counter: {0}'.format(cherrypy.session['counter'])
if __name__ == '__main__':
cherrypy.quickstart(App(), '/', config)

Answer 2

Inspired by saaj I found a solution that works. Try this...
import cherrypy.lib
config = {
'global' : {
'server.socket_host' : '127.0.0.1',
'server.socket_port' : 8080,
'server.thread_pool' : 4,
'tools.sessions.on': True,
'tools.sessions.storage_type': "file",
'tools.sessions.storage_path': "adf"
}
}
class Helloworld:
#cherrypy.expose
def make(self, token=''):
'''You can try open it from another browser
once set the value in /counter
'''
if(token == ''):
cherrypy.lib.sessions.init()
# take this token and put in the url 127.0.0.1:8080/make/ + token
return cherrypy.session.id
else:
#send two requests with the token. 1. to set a session var
# and 2. to retrieve the var from session
cherrypy.lib.sessions.init(self, id=token)
print('do something')
# on the second request check the value after init and it's HI!
cherrypy.session['something'] = 'HI'
return token
if __name__ == '__main__':
cherrypy.quickstart(Helloworld(), '/', config)
Hope this helps!

Answer 3

The previous examples didn't work for me (at least for file sessions). Maybe because the current version of cherrypy forbids session init for already initialized sessions. What did work, however, is this:
cherrypy.session.id = token
cherrypy.session._load()
I understand this is dirty, since the private method is called, but it's the only way I found.