from AccessControl import getSecurityManager 

from cubicweb.dbapi import connect, Connection, Cursor

from cubicweb.common.utils import ResultSet, ResultSetIterator, ResultSetRow, Entity

Connection.__allow_access_to_unprotected_subobjects__ = 1

Cursor.__allow_access_to_unprotected_subobjects__ = 1

ResultSet.__allow_access_to_unprotected_subobjects__ = 1

ResultSetIterator.__allow_access_to_unprotected_subobjects__ = 1

ResultSetRow.__allow_access_to_unprotected_subobjects__ = 1

Entity.__allow_access_to_unprotected_subobjects__ = 1

CNX_CACHE = {}

def get_connection(context, user=None, password=None,

                   host=None, database=None, group='cubicweb'):

    """get a connection on an cubicweb server"""

    request = context.REQUEST

    zope_user = getSecurityManager().getUser()

    if user is None:

        user = zope_user.getId()

    key = (user, host, database)

    try:

        return CNX_CACHE[key]

    except KeyError:

        if password is None:

            password = zope_user._getPassword()

        cnx = connect(user, password, host, database, group)

        CNX_CACHE[key] = cnx

        return cnx