first draft for a simple hooks based custom attribute storage,
with a BytesFileSystemStorage POC implementation.
Basically:
* a dictionary contains maps from which attribute of which entity types are
mapped to which custom storage
* hooks check for one of these entity type being added/modified/deleted
* read is based on the sql generator callback mecanism (used in vcsfile for
instance)
* all storages have the same basic interface (read, add, update, delete),
and should be pluggable in a transparent way (except at migration time
when one want to change from a storage to another)
* the sample BytesFileSystemStorage:
* may store Bytes attributes content of any entity type as file on the file system
* is based on one FSPATH rql/sql function and another _fsopen only available in sql
* has a dumb file name allocation algorithm
"""
:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
from logilab.common.testlib import TestCase, unittest_main, mock_object
from cubicweb.server.session import _make_description
class Variable:
def __init__(self, name):
self.name = name
self.children = []
def get_type(self, solution, args=None):
return solution[self.name]
def as_string(self):
return self.name
class Function:
def __init__(self, name, varname):
self.name = name
self.children = [Variable(varname)]
def get_type(self, solution, args=None):
return 'Int'
class MakeDescriptionTC(TestCase):
def test_known_values(self):
solution = {'A': 'Int', 'B': 'CWUser'}
self.assertEquals(_make_description((Function('max', 'A'), Variable('B')), {}, solution),
['Int','CWUser'])
if __name__ == '__main__':
unittest_main()