Listing Servers - OpenStack Nova API

Question

I've passed the session object from another class (using Cherrypy cookies) and rebuilt the Nova instance in this class to list the servers. The rebuilt Nova instance works however when I try and create a list of servers, I have an attribute error. There's very little (I found nothing remotely like this issue) out on the internet about this sort of issue. How do I solve this issue? :)

Code:

import cherrypy
import xmlrpclib
import xml.etree.ElementTree as ET
from keystoneauth1 import loading
from keystoneauth1 import session
import novaclient.client as client
from socket import gethostbyaddr

nova = client.Client("2.1", session=cherrypy.request.cookie.get('sessCookie').value)
serverList = nova.servers.list()
print serverList

Error:

File "/usr/lib/python2.7/site-packages/cherrypy/_cprequest.py", line 656, in respond
    response.body = self.handler()
  File "/usr/lib/python2.7/site-packages/cherrypy/lib/encoding.py", line 188, in __call__
    self.body = self.oldhandler(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/cherrypy/lib/jsontools.py", line 61, in json_handler
    value = cherrypy.serving.request._json_inner_handler(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/cherrypy/_cpdispatch.py", line 34, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "/var/www/frontend/controllers/api/vm.py", line 158, in GET
    serverList = nova.servers.list()
  File "/usr/lib/python2.7/site-packages/novaclient/v2/servers.py", line 749, in list
    "servers")
  File "/usr/lib/python2.7/site-packages/novaclient/base.py", line 242, in _list
    resp, body = self.api.client.get(url)
  File "/usr/lib/python2.7/site-packages/keystoneauth1/adapter.py", line 173, in get
    return self.request(url, 'GET', **kwargs)
  File "/usr/lib/python2.7/site-packages/novaclient/client.py", line 89, in request
    **kwargs)
  File "/usr/lib/python2.7/site-packages/keystoneauth1/adapter.py", line 331, in request
    resp = super(LegacyJsonAdapter, self).request(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/keystoneauth1/adapter.py", line 98, in request
    return self.session.request(url, method, **kwargs)
AttributeError: 'str' object has no attribute 'request'

Answer 1

The value of the session keyword is supposed to be a Keystone session object, but you're passing in a string.

You can read more about working with Keystone sessions here .