Commit b3c2514b authored by Jason Madden's avatar Jason Madden

TransactionalUndo releases storages it opens.

Fixes #268.
parent 79fe4737
......@@ -13,12 +13,17 @@
- Drop support for Python 3.4.
- Fix ``DB.undo()`` and ``DB.undoMultiple()`` to close the storage
they open behind the scenes when the transaction is committed or
rolled back. See `issue 268
<https://github.com/zopefoundation/ZODB/issues/268>`_.
5.5.1 (2018-10-25)
==================
- Fix KeyError on releasing resources of a Connection when closing the DB.
This requires at least version 2.4 of the `transaction` package.
See `issue 208 <https://github.com/zopefoundation/ZODB/issues/208>`.
This requires at least version 2.4 of the ``transaction`` package.
See `issue 208 <https://github.com/zopefoundation/ZODB/issues/208>`_.
5.5.0 (2018-10-13)
==================
......
......@@ -14,32 +14,29 @@
"""Database objects
"""
from __future__ import print_function
import sys
import logging
import datetime
import time
import warnings
from . import utils
from ZODB.broken import find_global
from ZODB.utils import z64
from ZODB.Connection import Connection, TransactionMetaData, noop
from ZODB._compat import Pickler, _protocol, BytesIO
import ZODB.serialize
from persistent.TimeStamp import TimeStamp
import six
import transaction
import transaction.weakset
from zope.interface import implementer
from ZODB import utils
from ZODB.interfaces import IDatabase
from ZODB.interfaces import IMVCCStorage
import transaction
from persistent.TimeStamp import TimeStamp
import six
from . import POSException, valuedoc
from ZODB.broken import find_global
from ZODB.utils import z64
from ZODB.Connection import Connection, TransactionMetaData, noop
import ZODB.serialize
from ZODB import valuedoc
logger = logging.getLogger('ZODB.DB')
......@@ -1056,19 +1053,43 @@ class TransactionalUndo(object):
def __init__(self, db, tids):
self._db = db
self._storage = getattr(
db._mvcc_storage, 'undo_instance', db._mvcc_storage.new_instance)()
self._tids = tids
self._storage = None
def abort(self, transaction):
pass
def close(self):
if self._storage is not None:
# We actually want to release the storage we've created,
# not close it. releasing it frees external resources
# dedicated to this instance, closing might make permanent
# changes that affect other instances.
self._storage.release()
self._storage = None
def tpc_begin(self, transaction):
assert self._storage is None, "Already in an active transaction"
tdata = TransactionMetaData(
transaction.user,
transaction.description,
transaction.extension)
transaction.set_data(self, tdata)
# `undo_instance` is not part of any IStorage interface;
# it is defined in our MVCCAdapter. Regardless, we're opening
# a new storage instance, and so we must close it to be sure
# to reclaim resources in a timely manner.
#
# Once the tpc_begin method has been called, the transaction manager will
# guarantee to call either `tpc_finish` or `tpc_abort`, so those are the only
# methods we need to be concerned about calling close() from.
db_mvcc_storage = self._db._mvcc_storage
self._storage = getattr(
db_mvcc_storage,
'undo_instance',
db_mvcc_storage.new_instance)()
self._storage.tpc_begin(tdata)
def commit(self, transaction):
......@@ -1081,15 +1102,27 @@ class TransactionalUndo(object):
self._storage.tpc_vote(transaction)
def tpc_finish(self, transaction):
try:
transaction = transaction.data(self)
self._storage.tpc_finish(transaction)
finally:
self.close()
def tpc_abort(self, transaction):
try:
transaction = transaction.data(self)
self._storage.tpc_abort(transaction)
finally:
self.close()
def sortKey(self):
return "%s:%s" % (self._storage.sortKey(), id(self))
# The transaction sorts data managers first before it calls
# `tpc_begin`, so we can't use our own storage because it's
# not open yet. Fortunately new_instances of a storage are
# supposed to return the same sort key as the original storage
# did.
return "%s:%s" % (self._db._mvcc_storage.sortKey(), id(self))
def connection(*args, **kw):
"""Create a database :class:`connection <ZODB.Connection.Connection>`.
......
......@@ -110,6 +110,117 @@ class DBTests(ZODB.tests.util.TestCase):
check(db.undoLog(0, 3) , True)
check(db.undoInfo(0, 3) , True)
class TransactionalUndoTests(unittest.TestCase):
def _makeOne(self):
from ZODB.DB import TransactionalUndo
class MockStorage(object):
instance_count = 0
close_count = 0
release_count = 0
begin_count = 0
abort_count = 0
def new_instance(self):
self.instance_count += 1
return self
def tpc_begin(self, tx):
self.begin_count += 1
def close(self):
self.close_count += 1
def release(self):
self.release_count += 1
def sortKey(self):
return 'MockStorage'
class MockDB(object):
def __init__(self):
self.storage = self._mvcc_storage = MockStorage()
return TransactionalUndo(MockDB(), [1])
def test_only_new_instance_on_begin(self):
undo = self._makeOne()
self.assertIsNone(undo._storage)
self.assertEqual(0, undo._db.storage.instance_count)
undo.tpc_begin(transaction.get())
self.assertIsNotNone(undo._storage)
self.assertEqual(1, undo._db.storage.instance_count)
self.assertEqual(1, undo._db.storage.begin_count)
self.assertIsNotNone(undo._storage)
# And we can't begin again
with self.assertRaises(AssertionError):
undo.tpc_begin(transaction.get())
def test_close_many(self):
undo = self._makeOne()
self.assertIsNone(undo._storage)
self.assertEqual(0, undo._db.storage.instance_count)
undo.close()
# Not open, didn't go through
self.assertEqual(0, undo._db.storage.close_count)
self.assertEqual(0, undo._db.storage.release_count)
undo.tpc_begin(transaction.get())
undo.close()
undo.close()
self.assertEqual(0, undo._db.storage.close_count)
self.assertEqual(1, undo._db.storage.release_count)
self.assertIsNone(undo._storage)
def test_sortKey(self):
# We get the same key whether or not we're open
undo = self._makeOne()
key = undo.sortKey()
self.assertIn('MockStorage', key)
undo.tpc_begin(transaction.get())
key2 = undo.sortKey()
self.assertEqual(key, key2)
def test_tpc_abort_closes(self):
undo = self._makeOne()
undo.tpc_begin(transaction.get())
undo._db.storage.tpc_abort = lambda tx: None
undo.tpc_abort(transaction.get())
self.assertEqual(0, undo._db.storage.close_count)
self.assertEqual(1, undo._db.storage.release_count)
def test_tpc_abort_closes_on_exception(self):
undo = self._makeOne()
undo.tpc_begin(transaction.get())
with self.assertRaises(AttributeError):
undo.tpc_abort(transaction.get())
self.assertEqual(0, undo._db.storage.close_count)
self.assertEqual(1, undo._db.storage.release_count)
def test_tpc_finish_closes(self):
undo = self._makeOne()
undo.tpc_begin(transaction.get())
undo._db.storage.tpc_finish = lambda tx: None
undo.tpc_finish(transaction.get())
self.assertEqual(0, undo._db.storage.close_count)
self.assertEqual(1, undo._db.storage.release_count)
def test_tpc_finish_closes_on_exception(self):
undo = self._makeOne()
undo.tpc_begin(transaction.get())
with self.assertRaises(AttributeError):
undo.tpc_finish(transaction.get())
self.assertEqual(0, undo._db.storage.close_count)
self.assertEqual(1, undo._db.storage.release_count)
def test_invalidateCache():
"""The invalidateCache method invalidates a connection caches for all of
the connections attached to a database::
......@@ -423,7 +534,7 @@ def cleanup_on_close():
"""
def test_suite():
s = unittest.makeSuite(DBTests)
s = unittest.defaultTestLoader.loadTestsFromName(__name__)
s.addTest(doctest.DocTestSuite(
setUp=ZODB.tests.util.setUp, tearDown=ZODB.tests.util.tearDown,
checker=checker
......
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