Drop support for ZODB3

MANIFEST.in

 graft tools
-include neo.conf CHANGELOG.rst TODO ZODB3.patch
+include neo.conf CHANGELOG.rst TODO

README.rst

@@ -52,7 +52,7 @@ Requirements
 
   - MySQLdb: https://github.com/PyMySQL/mysqlclient-python
 
-- For client nodes: ZODB 3.10.x or later
+- For client nodes: ZODB 4.4.5 or later
 
 Installation
 ============

ZODB3.patch

-Patch to ZODB 3.10.5 for ZODB unit tests.
-See also monkey-patch to Connection.tpc_finish in neo/client/__init__.py
-
-diff --git a/src/ZODB/interfaces.py b/src/ZODB/interfaces.py
-index 44ded35..db5c525 100644
---- a/src/ZODB/interfaces.py
-+++ b/src/ZODB/interfaces.py
-@@ -776,6 +776,10 @@ def tpc_finish(transaction, func = lambda tid: None):
-         called while the storage transaction lock is held.  It takes
-         the new transaction id generated by the transaction.
- 
-+        The return value can be either None or a serial giving new
-+        serial for objects whose ids were passed to previous store calls
-+        in the same transaction, and for which no serial was returned
-+        from either store or tpc_vote for objects passed to store.
-         """
- 
-     def tpc_vote(transaction):
-@@ -794,8 +798,6 @@ def tpc_vote(transaction):
-         The return value can be either None or a sequence of object-id
-         and serial pairs giving new serials for objects who's ids were
-         passed to previous store calls in the same transaction.
--        After the tpc_vote call, new serials must have been returned,
--        either from tpc_vote or store for objects passed to store.
- 
-         A serial returned in a sequence of oid/serial pairs, may be
-         the special value ZODB.ConflictResolution.ResolvedSerial to
-diff --git a/src/ZODB/tests/BasicStorage.py b/src/ZODB/tests/BasicStorage.py
-index 8e72272..61bc801 100644
---- a/src/ZODB/tests/BasicStorage.py
-+++ b/src/ZODB/tests/BasicStorage.py
-@@ -72,8 +72,10 @@ def checkSerialIsNoneForInitialRevision(self):
-         r1 = self._storage.store(oid, None, zodb_pickle(MinPO(11)),
-                                        '', txn)
-         r2 = self._storage.tpc_vote(txn)
--        self._storage.tpc_finish(txn)
-+        serial = self._storage.tpc_finish(txn)
-         newrevid = handle_serials(oid, r1, r2)
-+        if newrevid is None and serial is not None:
-+            newrevid = serial
-         data, revid = self._storage.load(oid, '')
-         value = zodb_unpickle(data)
-         eq(value, MinPO(11))
-diff --git a/src/ZODB/tests/MTStorage.py b/src/ZODB/tests/MTStorage.py
-index e01c802..b57de28 100644
---- a/src/ZODB/tests/MTStorage.py
-+++ b/src/ZODB/tests/MTStorage.py
-@@ -155,10 +155,12 @@ def dostore(self, i):
-         r2 = self.storage.tpc_vote(t)
-         self.pause()
- 
--        self.storage.tpc_finish(t)
-+        serial = self.storage.tpc_finish(t)
-         self.pause()
- 
-         revid = handle_serials(oid, r1, r2)
-+        if serial is not None and revid is None:
-+            revid = serial
-         self.oids[oid] = revid
- 
- class ExtStorageClientThread(StorageClientThread):
-diff --git a/src/ZODB/tests/RevisionStorage.py b/src/ZODB/tests/RevisionStorage.py
-index 9113757..ddd2dde 100644
---- a/src/ZODB/tests/RevisionStorage.py
-+++ b/src/ZODB/tests/RevisionStorage.py
-@@ -150,10 +150,12 @@ def helper(tid, revid, x):
-                 # Finish the transaction
-                 r2 = self._storage.tpc_vote(t)
-                 newrevid = handle_serials(oid, r1, r2)
--                self._storage.tpc_finish(t)
-+                serial = self._storage.tpc_finish(t)
-             except:
-                 self._storage.tpc_abort(t)
-                 raise
-+            if serial is not None and newrevid is None:
-+                newrevid = serial
-             return newrevid
-         revid1 = helper(1, None, 1)
-         revid2 = helper(2, revid1, 2)
-diff --git a/src/ZODB/tests/StorageTestBase.py b/src/ZODB/tests/StorageTestBase.py
-index 9737ec4..43f29ed 100644
---- a/src/ZODB/tests/StorageTestBase.py
-+++ b/src/ZODB/tests/StorageTestBase.py
-@@ -134,7 +134,7 @@ def handle_serials(oid, *args):
- 
-     A helper for function _handle_all_serials().
-     """
--    return handle_all_serials(oid, *args)[oid]
-+    return handle_all_serials(oid, *args).get(oid)
- 
- def import_helper(name):
-     __import__(name)
-@@ -191,7 +191,9 @@ def _dostore(self, oid=None, revid=None, data=None,
-             # Finish the transaction
-             r2 = self._storage.tpc_vote(t)
-             revid = handle_serials(oid, r1, r2)
--            self._storage.tpc_finish(t)
-+            serial = self._storage.tpc_finish(t)
-+            if serial is not None and revid is None:
-+                revid = serial
-         except:
-             self._storage.tpc_abort(t)
-             raise
-@@ -211,8 +213,8 @@ def _undo(self, tid, expected_oids=None, note=None):
-         self._storage.tpc_begin(t)
-         undo_result = self._storage.undo(tid, t)
-         vote_result = self._storage.tpc_vote(t)
--        self._storage.tpc_finish(t)
--        if expected_oids is not None:
-+        serial = self._storage.tpc_finish(t)
-+        if expected_oids is not None and serial is None:
-             oids = undo_result and undo_result[1] or []
-             oids.extend(oid for (oid, _) in vote_result or ())
-             self.assertEqual(len(oids), len(expected_oids), repr(oids))
-diff --git a/src/ZODB/tests/TransactionalUndoStorage.py b/src/ZODB/tests/TransactionalUndoStorage.py
-index 72adac2..203736a 100644
---- a/src/ZODB/tests/TransactionalUndoStorage.py
-+++ b/src/ZODB/tests/TransactionalUndoStorage.py
-@@ -76,6 +76,12 @@ def _transaction_vote(self, trans):
-     def _transaction_newserial(self, oid):
-         return self.__serials[oid]
- 
-+    def _transaction_finish(self, t, oid_list):
-+        tid = self._storage.tpc_finish(t)
-+        if tid is not None:
-+            for oid in oid_list:
-+                self.__serials[oid] = tid
-+
-     def _multi_obj_transaction(self, objs):
-         newrevs = {}
-         t = Transaction()
-@@ -85,7 +91,7 @@ def _multi_obj_transaction(self, objs):
-             self._transaction_store(oid, rev, data, '', t)
-             newrevs[oid] = None
-         self._transaction_vote(t)
--        self._storage.tpc_finish(t)
-+        self._transaction_finish(t, [x[0] for x in objs])
-         for oid in newrevs.keys():
-             newrevs[oid] = self._transaction_newserial(oid)
-         return newrevs
-@@ -218,9 +224,9 @@ def checkTwoObjectUndo(self):
-         self._transaction_store(oid2, revid2, p51, '', t)
-         # Finish the transaction
-         self._transaction_vote(t)
-+        self._transaction_finish(t, [oid1, oid2])
-         revid1 = self._transaction_newserial(oid1)
-         revid2 = self._transaction_newserial(oid2)
--        self._storage.tpc_finish(t)
-         eq(revid1, revid2)
-         # Update those same two objects
-         t = Transaction()
-@@ -230,9 +236,9 @@ def checkTwoObjectUndo(self):
-         self._transaction_store(oid2, revid2, p52, '', t)
-         # Finish the transaction
-         self._transaction_vote(t)
-+        self._transaction_finish(t, [oid1, oid2])
-         revid1 = self._transaction_newserial(oid1)
-         revid2 = self._transaction_newserial(oid2)
--        self._storage.tpc_finish(t)
-         eq(revid1, revid2)
-         # Make sure the objects have the current value
-         data, revid1 = self._storage.load(oid1, '')
-@@ -288,11 +294,12 @@ def checkTwoObjectUndoAtOnce(self):
-         tid1 = info[1]['id']
-         t = Transaction()
-         oids = self._begin_undos_vote(t, tid, tid1)
--        self._storage.tpc_finish(t)
-+        serial = self._storage.tpc_finish(t)
-         # We get the finalization stuff called an extra time:
--        eq(len(oids), 4)
--        unless(oid1 in oids)
--        unless(oid2 in oids)
-+        if serial is None:
-+            eq(len(oids), 4)
-+            unless(oid1 in oids)
-+            unless(oid2 in oids)
-         data, revid1 = self._storage.load(oid1, '')
-         eq(zodb_unpickle(data), MinPO(30))
-         data, revid2 = self._storage.load(oid2, '')
-@@ -326,7 +333,7 @@ def checkTwoObjectUndoAgain(self):
-         self._transaction_store(oid2, revid2, p52, '', t)
-         # Finish the transaction
-         self._transaction_vote(t)
--        self._storage.tpc_finish(t)
-+        self._transaction_finish(t, [oid1, oid2])
-         revid1 = self._transaction_newserial(oid1)
-         revid2 = self._transaction_newserial(oid2)
-         eq(revid1, revid2)
-@@ -346,7 +353,7 @@ def checkTwoObjectUndoAgain(self):
-         self._transaction_store(oid2, revid2, p53, '', t)
-         # Finish the transaction
-         self._transaction_vote(t)
--        self._storage.tpc_finish(t)
-+        self._transaction_finish(t, [oid1, oid2])
-         revid1 = self._transaction_newserial(oid1)
-         revid2 = self._transaction_newserial(oid2)
-         eq(revid1, revid2)
-@@ -358,10 +365,11 @@ def checkTwoObjectUndoAgain(self):
-         tid = info[1]['id']
-         t = Transaction()
-         oids = self._begin_undos_vote(t, tid)
--        self._storage.tpc_finish(t)
--        eq(len(oids), 1)
--        self.failUnless(oid1 in oids)
--        self.failUnless(not oid2 in oids)
-+        serial = self._storage.tpc_finish(t)
-+        if serial is None:
-+            eq(len(oids), 1)
-+            self.failUnless(oid1 in oids)
-+            self.failUnless(not oid2 in oids)
-         data, revid1 = self._storage.load(oid1, '')
-         eq(zodb_unpickle(data), MinPO(33))
-         data, revid2 = self._storage.load(oid2, '')
-@@ -397,7 +405,7 @@ def checkNotUndoable(self):
-         self._transaction_store(oid1, revid1, p81, '', t)
-         self._transaction_store(oid2, revid2, p91, '', t)
-         self._transaction_vote(t)
--        self._storage.tpc_finish(t)
-+        self._transaction_finish(t, [oid1, oid2])
-         revid1 = self._transaction_newserial(oid1)
-         revid2 = self._transaction_newserial(oid2)
-         eq(revid1, revid2)
-@@ -683,9 +691,9 @@ def undo(i):
-             tid = p64(i + 1)
-             eq(txn.tid, tid)
- 
--            L1 = [(rec.oid, rec.tid, rec.data_txn) for rec in txn]
--            L2 = [(oid, revid, None) for _tid, oid, revid in orig
--                  if _tid == tid]
-+            L1 = {(rec.oid, rec.tid, rec.data_txn) for rec in txn}
-+            L2 = {(oid, revid, None) for _tid, oid, revid in orig
-+                  if _tid == tid}
- 
-             eq(L1, L2)
- 

neo/client/__init__.py

@@ -25,51 +25,7 @@ def patch():
 
     H = lambda f: md5(f.func_code.co_code).hexdigest()
 
-    # Allow serial to be returned as late as tpc_finish
-    #
-    # This makes possible for storage to allocate serial inside tpc_finish,
-    # removing the requirement to serialise second commit phase (tpc_vote
-    # to tpc_finish/tpc_abort).
-
-    h = H(Connection.tpc_finish)
-
-    def tpc_finish(self, transaction):
-        """Indicate confirmation that the transaction is done."""
-
-        def callback(tid):
-            if self._mvcc_storage:
-                # Inter-connection invalidation is not needed when the
-                # storage provides MVCC.
-                return
-            d = dict.fromkeys(self._modified)
-            self._db.invalidate(tid, d, self)
-#       It's important that the storage calls the passed function
-#       while it still has its lock.  We don't want another thread
-#       to be able to read any updated data until we've had a chance
-#       to send an invalidation message to all of the other
-#       connections!
-        # <patch>
-        serial = self._storage.tpc_finish(transaction, callback)
-        if serial is not None:
-            assert isinstance(serial, bytes), repr(serial)
-            for oid_iterator in (self._modified, self._creating):
-                for oid in oid_iterator:
-                    obj = self._cache.get(oid, None)
-                    # Ignore missing objects and don't update ghosts.
-                    if obj is not None and obj._p_changed is not None:
-                        obj._p_changed = 0
-                        obj._p_serial = serial
-        # </patch>
-        self._tpc_cleanup()
-
-    global OLD_ZODB
-    OLD_ZODB = h in (
-        'ab9b1b8d82c40e5fffa84f7bc4ea3a8b', # Python 2.7
-        )
-
-    if OLD_ZODB:
-        Connection.tpc_finish = tpc_finish
-    elif hasattr(Connection, '_handle_serial'): # merged upstream ?
+    if hasattr(Connection, '_handle_serial'): # merged upstream ?
         assert hasattr(Connection, '_warn_about_returned_serial')
 
     # sync() is used to provide a "network barrier", which is required for

neo/client/app.py

@@ -25,9 +25,6 @@ except ImportError:
     from cPickle import dumps, loads
     _protocol = 1
 from ZODB.POSException import UndoError, ConflictError, ReadConflictError
-from . import OLD_ZODB
-if OLD_ZODB:
-  from ZODB.ConflictResolution import ResolvedSerial
 from persistent.TimeStamp import TimeStamp
 
 from neo.lib import logging
@@ -641,9 +638,6 @@ class Application(ThreadedApplication):
         #       - If possible, recover from master failure.
         if txn_context.error:
             raise NEOStorageError(txn_context.error)
-        if OLD_ZODB:
-            return [(oid, ResolvedSerial)
-                for oid in txn_context.resolved_dict]
         return txn_context.resolved_dict
 
     def tpc_abort(self, transaction):

neo/storage/database/importer.py

@@ -609,6 +609,10 @@ class ImporterDatabaseManager(DatabaseManager):
         except TypeError: # loadBefore returned None
             return False
         except POSKeyError:
+            # loadBefore does not distinguish between an oid:
+            # - that does not exist at any serial
+            # - that was deleted
+            # - whose creation was undone
             assert not o or o[3] is None, o
             return o
         if serial != tid:
@@ -617,22 +621,15 @@ class ImporterDatabaseManager(DatabaseManager):
             u_tid = u64(serial)
         if u_tid <= self.zodb_tid and o:
             return o
-        if value:
         value = zodb.repickle(value)
-            checksum = util.makeChecksum(value)
-        else:
-            # CAVEAT: Although we think loadBefore should not return an empty
-            #         value for a deleted object (BBB: fixed in ZODB4),
-            #         there's no need to distinguish this case in the above
-            #         except clause because it would be crazy to import a
-            #         NEO DB using this backend.
-            checksum = None
         if not next_serial:
             next_serial = db._getNextTID(db._getPartition(u_oid), u_oid, u_tid)
             if next_serial:
                 next_serial = p64(next_serial)
-        return (serial, next_serial,
-            0, checksum, value, zodb.getDataTid(z_oid, u_tid))
+        return (serial, next_serial, 0,
+                util.makeChecksum(value),
+                value,
+                zodb.getDataTid(z_oid, u_tid))
 
     def getTransaction(self, tid, all=False):
         u64 = util.u64

neo/tests/__init__.py

@@ -517,6 +517,15 @@ class TransactionalResource(object):
             return lambda *_: None
         return self.__getattribute__(attr)
 
+try:
+    from ZODB.Connection import TransactionMetaData
+except ImportError: # BBB: ZODB < 5
+    def getTransactionMetaData(txn, conn):
+        return txn
+else:
+    def getTransactionMetaData(txn, conn):
+        return txn.data(conn)
+
 
 class Patch(object):
     """

neo/tests/threaded/__init__.py

@@ -330,6 +330,15 @@ class Node(object):
     def filterConnection(self, *peers):
         return ConnectionFilter(self.getConnectionList(*peers))
 
+    @contextmanager
+    def patchDeferred(self, method):
+        deferred = []
+        with Patch(method.__self__, **{method.__name__:
+                lambda orig, *args, **kw: deferred.append(
+                      partial(orig, *args, **kw))}) as p:
+            yield p
+        self.em.wakeup(*deferred)
+
 class ServerNode(Node):
 
     _server_class_dict = {}

neo/tests/threaded/test.py

@@ -36,7 +36,7 @@ from neo.lib.handler import DelayEvent, EventHandler
 from neo.lib import logging
 from neo.lib.protocol import (CellStates, ClusterStates, NodeStates, NodeTypes,
     Packets, Packet, uuid_str, ZERO_OID, ZERO_TID, MAX_TID)
-from .. import Patch, TransactionalResource
+from .. import Patch, TransactionalResource, getTransactionMetaData
 from . import ClientApplication, ConnectionFilter, LockLock, NEOCluster, \
     NEOThreadedTest, RandomConflictDict, Serialized, ThreadId, with_cluster
 from neo.lib.util import add64, makeChecksum, p64, u64
@@ -1312,10 +1312,7 @@ class Test(NEOThreadedTest):
                 # Check that the storage hasn't answered to the store,
                 # which means that a lock is still taken for r['x'] by t2.
                 self.tic()
-                try:
-                    txn = txn.data(c1)
-                except (AttributeError, KeyError): # BBB: ZODB < 5
-                    pass
+                txn = getTransactionMetaData(txn, c1)
                 txn_context = cluster.client._txn_container.get(txn)
                 empty = txn_context.queue.empty()
                 ll()

neo/tests/threaded/testImporter.py

@@ -19,18 +19,22 @@ from cStringIO import StringIO
 from itertools import izip_longest
 import os, random, shutil, threading, time, unittest
 import transaction, ZODB
+from persistent import Persistent
 from neo.client.exception import NEOPrimaryMasterLost
 from neo.lib import logging
+from neo.lib.protocol import MAX_TID
 from neo.lib.util import cached_property, p64, u64
 from neo.master.transactions import TransactionManager
 from neo.storage.database import getAdapterKlass, importer, manager
 from neo.storage.database.importer import \
     Repickler, TransactionRecord, WriteBack
-from .. import expectedFailure, getTempDirectory, random_tree, Patch
+from .. import expectedFailure, getTempDirectory, random_tree, \
+    Patch, TransactionalResource, getTransactionMetaData
 from . import NEOCluster, NEOThreadedTest
 from ZODB import serialize
 from ZODB.DB import TransactionalUndo
 from ZODB.FileStorage import FileStorage
+from ZODB.POSException import POSKeyError
 
 class Equal:
 
@@ -371,6 +375,45 @@ class ImporterTests(NEOThreadedTest):
             t.begin()
             finalCheck(r)
 
+    def testDeleteAndUndo(self):
+        fs_path, cfg = self.getFS()
+        c = ZODB.DB(FileStorage(fs_path)).open()
+        s = c.db().storage
+        r = c.root()
+        tid = r._p_serial
+        r[''] = delete = Persistent()
+        transaction.commit()
+        self.assertEqual(delete._p_oid, p64(1))
+        del r['']
+        TransactionalResource(transaction, 0, commit=lambda txn:
+            s.deleteObject(delete._p_oid, delete._p_serial,
+                           getTransactionMetaData(txn, c)))
+        transaction.commit()
+        r[''] = undo = Persistent()
+        transaction.commit()
+        c.db().undo(s.undoLog(last=1)[0]['id'])
+        transaction.commit()
+        self.assertEqual(undo._p_oid, p64(2))
+        def check():
+            self.assertIsNone(s.loadBefore(delete._p_oid, tid))
+            for oid in delete._p_oid, undo._p_oid, p64(3):
+                self.assertRaises(POSKeyError, s.loadBefore, oid, MAX_TID)
+        check() # FileStorage
+        c.db().close()
+        importer = {'zodb': [('root', cfg)]}
+        with NEOCluster(importer=importer) as cluster:
+            storage = cluster.storage
+            dm = storage.dm
+            with storage.patchDeferred(dm._finished):
+                with storage.patchDeferred(dm.doOperation):
+                    cluster.start()
+                    s = cluster.getZODBStorage()
+                    check() # before import
+                self.tic()
+                check() # imported, Importer getObject
+            self.tic()
+            check() # imported, direct getObject
+
 
 if __name__ == "__main__":
     unittest.main()

setup.py

@@ -44,7 +44,7 @@ get3rdParty(x, '3rdparty/' + x, 'https://lab.nexedi.com/nexedi/erp5'
     '/raw/14b0fcdcc31c5791646f9590678ca028f5d221f5/product/ERP5Type/' + x,
     'abb7970856540fd02150edd1fa9a3a3e8d0074ec526ab189684ef7ea9b41825f')
 
-zodb_require = ['ZODB3>=3.10dev']
+zodb_require = ['ZODB>=4.4.5']
 
 extras_require = {
     'admin': [],