[ZODB-Dev] Zeo: connection problem

[Richard Jennings]

Hi,
I have a Zope2.7.2/Zeo2.2.2 instance running, using the standard zope.conf &
zeo.conf settings (exception: port=8081) and it works fine.  I want read-only
access to the instance zodb to read site object properties.  In a test
script, I have used the apparently classic pattern, shown below:

	addr = ('localhost', 8081)
        storage = ClientStorage.ClientStorage(addr)
        db = DB(storage)
        conn = db.open()
        root = conn.root()
        app = root['Application']

This results in the exception shown below.
The pattern is so basic and simple, it seems difficult to make a mistake, but
I am! Can someone tell me what?

Thanks,
Richard Jennings
___________________________________________

Traceback (most recent call last):
  File "./ZeoTest.py", line 162, in ?
    response = request.submit()
  File "./ZeoTest.py", line 112, in submit
    app = root['Application']
  File "/usr/lib/python2.3/UserDict.py", line 19, in __getitem__
    def __getitem__(self, key): return self.data[key]
  File "/opt/zope/lib/python/ZODB/Connection.py", line 562, in setstate
    self._set_ghost_state(obj, p)
  File "/opt/zope/lib/python/ZODB/Connection.py", line 601, in
_set_ghost_state
    state = unpickler.load()
  File "/opt/zope/lib/python/ZODB/Connection.py", line 198, in
_persistent_load
    return self[oid]
  File "/opt/zope/lib/python/ZODB/Connection.py", line 160, in __getitem__
    klass=self._db._classFactory(self, module, name)
  File "/opt/zope/lib/python/ZODB/DB.py", line 128, in _classFactory
    name)
AttributeError: 'module' object has no attribute 'Application'

zope.conf (extract):

#<zodb_db main>
#    # Main FileStorage database
#    <filestorage>
#      path $INSTANCE/var/Data.fs
#    </filestorage>
#    mount-point /
#</zodb_db>

<zodb_db temporary>
    # Temporary storage database (for sessions)
    <temporarystorage>
      name temporary storage for sessioning
    </temporarystorage>
    mount-point /temp_folder
    container-class Products.TemporaryFolder.TemporaryContainer
</zodb_db>

# Other storage examples
#
# ZEO client storage:
#
<zodb_db main>
  mount-point /
  <zeoclient>
    server localhost:8081
    storage 1
    name zeostorage
    var $INSTANCE/var
  </zeoclient>
</zodb_db>

zeo.conf (extract):

%define INSTANCE /var/opt/zope/default

<zeo>
  address 8081
  read-only false
  invalidation-queue-size 100
  # monitor-address PORT
  # transaction-timeout SECONDS
</zeo>

<filestorage 1>
  path $INSTANCE/var/Data.fs
</filestorage>