Numerous fixes in response to: https://github.com/zopefoundation/ZODB/pull/93

src/ZEO/ClientStorage.py

@@ -54,8 +54,6 @@ logger = logging.getLogger(__name__)
 # max signed 64-bit value ~ infinity :) Signed cuz LBTree and TimeStamp
 m64 = b'\x7f\xff\xff\xff\xff\xff\xff\xff'
 
-from ZODB.ConflictResolution import ResolvedSerial
-
 def tid2time(tid):
     return str(TimeStamp(tid))
 
@@ -748,7 +746,7 @@ class ClientStorage(ZODB.ConflictResolution.ConflictResolvingStorage):
                         self._async('storea', oid, committed, data, id(txn))
                         tbuf.resolve(oid, data)
                     else:
-                        tbuf.serial(oid, ResolvedSerial)
+                        tbuf.server_resolve(oid)
 
                 vote_attempts += 1
 

src/ZEO/StorageServer.py

@@ -42,7 +42,6 @@ from ZEO._compat import Pickler, Unpickler, PY3, BytesIO
 from ZEO.Exceptions import AuthError
 from ZEO.monitor import StorageStats
 from ZEO.asyncio.server import Delay, MTDelay, Result
-from ZODB.ConflictResolution import ResolvedSerial
 from ZODB.loglevels import BLATHER
 from ZODB.POSException import StorageError, StorageTransactionError
 from ZODB.POSException import TransactionError, ReadOnlyError, ConflictError

src/ZEO/TransactionBuffer.py

@@ -25,8 +25,6 @@ import os
 import tempfile
 import ZODB.blob
 
-from ZODB.ConflictResolution import ResolvedSerial
-
 from ZEO._compat import Pickler, Unpickler
 
 class TransactionBuffer:
@@ -66,11 +64,8 @@ class TransactionBuffer:
         self.store(oid, data)
         self.client_resolved[oid] = self.count - 1
 
-    def serial(self, oid, serial):
-        if isinstance(serial, Exception):
-            self.exception = serial # This transaction will never be committed
-        elif serial == ResolvedSerial:
-            self.server_resolved.add(oid)
+    def server_resolve(self, oid):
+        self.server_resolved.add(oid)
 
     def storeBlob(self, oid, blobfilename):
         self.blobs.append((oid, blobfilename))

src/ZEO/asyncio/client.py

@@ -6,7 +6,6 @@ else:
     import trollius as asyncio
 
 from ZEO.Exceptions import ClientDisconnected
-from ZODB.ConflictResolution import ResolvedSerial
 import concurrent.futures
 import functools
 import logging

src/ZEO/tests/Cache.py

@@ -44,8 +44,8 @@ class TransUndoStorageWithCache:
 
         self._storage.tpc_finish(t)
 
-        assert len(oids) == 1
-        assert oids[0] == oid
+        [uoid] = oids
+        assert uoid == oid
         data, revid = self._storage.load(oid, '')
         obj = zodb_unpickle(data)
         assert obj == MinPO(24)

src/ZEO/tests/ConnectionTests.py

@@ -28,8 +28,7 @@ from ZODB.DB import DB
 from ZODB.POSException import ReadOnlyError, ConflictError
 from ZODB.tests.StorageTestBase import StorageTestBase
 from ZODB.tests.MinPO import MinPO
-from ZODB.tests.StorageTestBase \
-     import zodb_pickle, zodb_unpickle, handle_all_serials, handle_serials
+from ZODB.tests.StorageTestBase import zodb_pickle, zodb_unpickle
 import ZODB.tests.util
 
 import transaction
@@ -1065,14 +1064,12 @@ class MSTThread(threading.Thread):
                     data = MinPO("%s.%s.t%d.o%d" % (tname, c.__name, i, j))
                     #print(data.value)
                     data = zodb_pickle(data)
-                    s = c.store(oid, ZERO, data, '', t)
-                    c.__serials.update(handle_all_serials(oid, s))
+                    c.store(oid, ZERO, data, '', t)
 
             # Vote on all servers and handle serials
             for c in clients:
                 #print("%s.%s.%s vote" % (tname, c.__name, i))
-                s = c.tpc_vote(t)
-                c.__serials.update(handle_all_serials(None, s))
+                c.tpc_vote(t)
 
             # Finish on all servers
             for c in clients:

src/ZEO/tests/testTransactionBuffer.py

@@ -14,7 +14,6 @@
 import random
 import unittest
 
-from ZODB.ConflictResolution import ResolvedSerial
 from ZEO.TransactionBuffer import TransactionBuffer
 
 def random_string(size):
@@ -26,10 +25,11 @@ def new_store_data():
     """Return arbitrary data to use as argument to store() method."""
     return random_string(8), random_string(random.randrange(1000))
 
-def store(tbuf, serial=None):
+def store(tbuf, resolved=False):
     data = new_store_data()
     tbuf.store(*data)
-    tbuf.serial(data[0], serial)
+    if resolved:
+        tbuf.server_resolve(data[0])
     return data
 
 class TransBufTests(unittest.TestCase):
@@ -46,7 +46,7 @@ class TransBufTests(unittest.TestCase):
         data = []
         for i in range(10):
             data.append((store(tbuf), False))
-            data.append((store(tbuf, ResolvedSerial), True))
+            data.append((store(tbuf, True), True))
 
         for i, (oid, d, resolved) in enumerate(tbuf):
             self.assertEqual((oid, d), data[i][0])

src/ZEO/tests/testZEO.py

@@ -538,7 +538,6 @@ class CommonBlobTests:
     def checkStoreBlob(self):
         import transaction
         from ZODB.blob import Blob
-        from ZODB.tests.StorageTestBase import handle_serials
         from ZODB.tests.StorageTestBase import ZERO
         from ZODB.tests.StorageTestBase import zodb_pickle
 
@@ -579,8 +578,7 @@ class CommonBlobTests:
 
     def checkLoadBlob(self):
         from ZODB.blob import Blob
-        from ZODB.tests.StorageTestBase import zodb_pickle, ZERO, \
-             handle_serials
+        from ZODB.tests.StorageTestBase import zodb_pickle, ZERO
         import transaction
 
         somedata = b'a' * 10
@@ -629,7 +627,6 @@ class BlobAdaptedFileStorageTests(FullGenericTests, CommonBlobTests):
     def checkStoreAndLoadBlob(self):
         import transaction
         from ZODB.blob import Blob
-        from ZODB.tests.StorageTestBase import handle_serials
         from ZODB.tests.StorageTestBase import ZERO
         from ZODB.tests.StorageTestBase import zodb_pickle