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Add variant transaction logic per zope.sqlalchemy 1.1 changes

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without this we can't use zope.sqlalchemy 1.1 due to error
This commit is contained in:
Lance Edgar 2021-01-16 14:13:34 -06:00
parent db7d021133
commit a3cbb24892
1 changed files with 26 additions and 8 deletions
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22
tailbone/db.py
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@ -1,8 +1,8 @@
# -*- coding: utf-8 -*-
# -*- coding: utf-8; -*-
################################################################################
#
# Rattail -- Retail Software Framework
# Copyright © 2010-2017 Lance Edgar
# Copyright © 2010-2021 Lance Edgar
#
# This file is part of Rattail.
#
@ -30,6 +30,7 @@ import sqlalchemy as sa
from zope.sqlalchemy import datamanager
import sqlalchemy_continuum as continuum
from sqlalchemy.orm import sessionmaker, scoped_session
from pkg_resources import get_distribution, parse_version
from rattail.db import SessionBase
from rattail.db.continuum import versioning_manager
@ -44,6 +45,11 @@ TrainwreckSession = scoped_session(sessionmaker())
# empty dict for now, this must populated on app startup (if needed)
ExtraTrainwreckSessions = {}
# some of the logic below may need to vary somewhat, based on which version of
# zope.sqlalchemy we have installed
zope_sqlalchemy_version = get_distribution('zope.sqlalchemy').version
zope_sqlalchemy_version_parsed = parse_version(zope_sqlalchemy_version)
class TailboneSessionDataManager(datamanager.SessionDataManager):
"""Integrate a top level sqlalchemy session transaction into a zope transaction
@ -85,6 +91,18 @@ def join_transaction(session, initial_state=datamanager.STATUS_ACTIVE, transacti
This function is copied from upstream, and tweaked so that our custom
:class:`TailboneSessionDataManager` will be used.
"""
# the upstream internals of this function has changed a little over time.
# unfortunately for us, that means we must include each variant here.
if zope_sqlalchemy_version_parsed >= parse_version('1.1'): # 1.1+
if datamanager._SESSION_STATE.get(session, None) is None:
if session.twophase:
DataManager = datamanager.TwoPhaseSessionDataManager
else:
DataManager = TailboneSessionDataManager
DataManager(session, initial_state, transaction_manager, keep_session=keep_session)
else: # pre-1.1
if datamanager._SESSION_STATE.get(id(session), None) is None:
if session.twophase:
DataManager = datamanager.TwoPhaseSessionDataManager