[mod] make ViolatedConstraint actually display useful information
Move from:
(Pdb++) raise some_exception
*** ViolatedConstraint:
To:
(Pdb++) raise some_exception
*** ViolatedConstraint: constraint 'cstr56c2ab4b3154f21d08b067742ce5bd9d' is being violated by the query 'ALTER TABLE cw_Bibliography ADD CONSTRAINT cstr56c2ab4b3154f21d08b067742ce5bd9d CHECK(cw_item_type IN ('journalArticle', 'note', 'book', 'thesis', 'film', 'web page', 'manuscrit', 'tapuscrit'))'. You can run the inverted constraint on the database to list the problematic rows.
And save hours of debugging to actually understand what is going on.
# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""Simple cryptographic routines, based on python-crypto."""
from base64 import b64encode, b64decode
import pickle
from Crypto.Cipher import Blowfish
_CYPHERERS = {}
def _cypherer(seed):
try:
return _CYPHERERS[seed]
except KeyError:
_CYPHERERS[seed] = Blowfish.new(seed, Blowfish.MODE_ECB)
return _CYPHERERS[seed]
def encrypt(data, seed):
string = pickle.dumps(data)
string = string + '*' * (8 - len(string) % 8)
string = b64encode(_cypherer(seed).encrypt(string))
return str(string)
def decrypt(string, seed):
# pickle ignores trailing characters so we do not need to strip them off
string = _cypherer(seed).decrypt(b64decode(string))
return pickle.loads(string)