Fix some monkey-patches to make them compatible with ZODB5

See also https://github.com/zopefoundation/ZEO/pull/63
     and nexedi/erp5!1095

No error in testCMFActivity and testConflictResolution.
For the only error in testInvalidationBug, see comment.

But this commit is not enough for ZODB5. The only known issue so far
is the use of newer pickle protocol, which breaks export of ZODB data
and requires non-trivial changes in our XMLExportImport/ppml code.
So for the moment, many failures in testBusinessTempate.

product/ERP5/tests/testInvalidationBug.py

@@ -90,6 +90,9 @@ class TestInvalidationBug(ERP5TypeTestCase):
     self.assertEqual(result_list[-2], None)  # ZODB
     self.assertEqual(result_list[-1], [1,1]) # activity tables last
 
+  # TODO: - skip this test for ZEO>=5 because it's covered upstream
+  #         (and later remove it)
+  #       - in slapos.git, enable server_sync in zope.conf
   def testLateInvalidationFromZEO(self):
     ### Check unit test is run properly
     from ZEO.ClientStorage import ClientStorage

product/ERP5Type/patches/DemoStorage.py

@@ -13,7 +13,7 @@
 ##############################################################################
 
 from ZODB import DemoStorage as _DemoStorage
-from ZODB.ConflictResolution import ConflictResolvingStorage, ResolvedSerial
+from ZODB.ConflictResolution import ConflictResolvingStorage
 from ZODB.POSException import ConflictError
 
 class DemoStorage(_DemoStorage.DemoStorage, ConflictResolvingStorage):
@@ -33,4 +33,5 @@ class DemoStorage(_DemoStorage.DemoStorage, ConflictResolvingStorage):
 
 if not issubclass(_DemoStorage.DemoStorage, ConflictResolvingStorage):
     # BBB: ZODB < 4.3
+    from ZODB.ConflictResolution import ResolvedSerial
     _DemoStorage.DemoStorage = DemoStorage

product/ERP5Type/patches/XMLExportImport.py

@@ -107,9 +107,7 @@ def exportXML(jar, oid, file=None):
     def getReorderedPickle(oid):
         p = pickle_dict[oid]
         if p is None:
-            # Versions are ignored, but some 'load()' implementations require them
-            # FIXME: remove "''" when TmpStore.load() on ZODB stops asking for it.
-            p = load(oid, '')[0]
+            p = load(oid)[0]
             p = reorderPickle(jar, p)[1]
             if len(p) < max_cache[0]:
                 max_cache[0] -= len(p)

product/ERP5Type/patches/ZODBConnection.py

@@ -11,35 +11,28 @@
 #
 ##############################################################################
 
-# override ZODB.Connection.newTransaction() to do a synchronous call before
-# flushing all invalidations, this will serve as a "network barrier" that
-# will force Connection to wait for all invalidations sent from other parallel
-# transactions so that, for instance, activity processing can see a recent
-# enough state of the ZODB.
-
 import time
 from Products.ERP5Type.Timeout import TimeoutReachedError, getDeadline
 from ZODB.Connection import Connection
 
 FORCE_STORAGE_SYNC_ON_CONNECTION_OPENING = False
 
-if 1: # keep indentation. Also good for quick disabling.
+if 1: # for quick disabling.
 
-    def ping(self):
-        # Use a synchronous call to make sure we have received all invalidation
-        # methods that could be stuck in the wire so MVCC behaves correctly.
-        # XXX Use a proper ping method exported by ClientStorage instead of
-        # this hack
-        ping = getattr(getattr(self._storage, '_server', None),
-                       'getAuthProtocol',
-                       lambda: None)
-        ping()
+    if hasattr(Connection, '_storage_sync'): # ZODB<5
+        # BBB: For ZEO<5, use a synchronous call to make sure we have received
+        #      all invalidation methods that could be stuck in the wire so MVCC
+        #      behaves correctly. This can be seen as a "network barrier",
+        #      so that, for instance, activity processing can see a recent
+        #      enough state of the ZODB.
+        #      ZEO5 has an option and NEO does it by default.
 
         def newTransaction(self, *ignored):
-        self.ping()
+            zeo = getattr(self._storage, '_server', None)
+            if zeo is not None:
+                zeo.getAuthProtocol()
             self._storage_sync()
 
-    Connection.ping = ping
         Connection.newTransaction = newTransaction
 
     if FORCE_STORAGE_SYNC_ON_CONNECTION_OPENING:

product/ERP5Type/tests/custom_zodb.py

@@ -168,6 +168,9 @@ else:
   else:
     forkNodes()
     from ZEO.ClientStorage import ClientStorage
+    try:
+        Storage = ClientStorage(zeo_client, server_sync=True)
+    except TypeError: # BBB: ZEO<5
         Storage = ClientStorage(zeo_client)
 
 if node_pid_list is not None: