MySQLUnicodeCursor fails on blob data

[dalius@…]

I have upgraded to trac 0.11.2.1 and my AuthOpenIdPlugin stopped to work (​http://trac.sandbox.lt/auth/wiki/AuthOpenIdPlugin).

After little analysis I have found that problem is in trac's mysql_backend: ​http://svn.edgewall.org/repos/trac/trunk/trac/db/mysql_backend.py

The problem is that it tries to decode BLOB data column and naturally fails to do that.

I am using following fix at this moment (but I'm not satisfied with it):

    class MySQLUnicodeCursor(MySQLdb.cursors.Cursor):

        def _try_to_decode(self, v):
            try:
                return v.decode('utf-8')
            except UnicodeDecodeError:
                return v

        def _convert_row(self, row):
            return tuple([(isinstance(v, str) and [self._try_to_decode(v)] or [v])[0]
                          for v in row])

[dalius@…]

I have decided to use MySql connection directly at that worked (I mean .cnx.cnx).