Implements backup using specialised storage nodes and relying on replication

Replication is also fully reimplemented:
- It is not done anymore on whole partitions.
- It runs at lowest priority not to degrades performance for client nodes.

Schema of MySQL table is changed to optimize storage layout: rows are now
grouped by age, for good partial replication performance.
This certainly also speeds up simple loads/stores.

TODO

@@ -111,42 +111,17 @@ RC  - Review output of pylint (CODE)
       consider using query(request, args) instead of query(request % args)
     - Make listening address and port optionnal, and if they are not provided
       listen on all interfaces on any available port.
-    - Replication throttling (HIGH AVAILABILITY)
-      In its current implementation, replication runs at full speed, which
-      degrades performance for client nodes. Replication should allow
-      throttling, and that throttling should be configurable.
-      See "Replication pipelining".
+    - Make replication speed configurable (HIGH AVAILABILITY)
+      In its current implementation, replication runs at lowest priority, not to
+      degrades performance for client nodes. But when there's only 1 storage
+      left for a partition, it may be wanted to guarantee a minimum speed to
+      avoid complete data loss if another failure happens too early.
     - Pack segmentation & throttling (HIGH AVAILABILITY)
       In its current implementation, pack runs in one call on all storage nodes
       at the same time, which lcoks down the whole cluster. This task should
       be split in chunks and processed in "background" on storage nodes.
       Packing throttling should probably be at the lowest possible priority
       (below interactive use and below replication).
-    - Replication pipelining (SPEED)
-      Replication work currently with too many exchanges between replicating
-      storage, and network latency can become a significant limit.
-      This should be changed to have just one initial request from
-      replicating storage, and multiple packets from reference storage with
-      database range checksums. When receiving these checksums, replicating
-      storage must compare with what it has, and ask row lists (might not even
-      be required) and data when there are differences. Quick fetching from
-      network with asynchronous checking (=queueing) + congestion control
-      (asking reference storage's to pause its packet flow) will probably be
-      required.
-      This should make it easier to throttle replication workload on reference
-      storage node, as it can decide to postpone replication-related packets on
-      its own.
-    - Partial replication (SPEED)
-      In its current implementation, replication always happens on a whole
-      partition. In typical use, only a few last transactions will have been
-      missed, so replicating only past a given TID would be much faster.
-      To achieve this, storage nodes must store 2 values:
-      - a pack identifier, which must be different each time a pack occurs
-        (increasing number sequence, TID-ish, etc) to trigger a
-        whole-partition replication when a pack happened (this could be
-        improved too, later)
-      - the latest (-ish) transaction committed locally, to use as a lower
-        replication boundary
     - tpc_finish failures propagation to master (FUNCTIONALITY)
       When asked to lock transaction data, if something goes wrong the master
       node must be informed.

UPGRADE

@@ -9,7 +9,7 @@ SQL commands to migrate each storage from NEO 0.10.x::
   CREATE TABLE new_data (id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, hash BINARY(20) NOT NULL UNIQUE, compression TINYINT UNSIGNED NULL, value LONGBLOB NULL) ENGINE = InnoDB SELECT DISTINCT obj.hash as hash, compression, value FROM obj, data WHERE obj.hash=data.hash ORDER BY serial;
   DROP TABLE data;
   RENAME TABLE new_data TO data;
-  CREATE TABLE new_obj (partition SMALLINT UNSIGNED NOT NULL, oid BIGINT UNSIGNED NOT NULL, serial BIGINT UNSIGNED NOT NULL, data_id BIGINT UNSIGNED NULL, value_serial BIGINT UNSIGNED NULL, PRIMARY KEY (partition, oid, serial), KEY (data_id)) ENGINE = InnoDB SELECT partition, oid, serial, data.id as data_id, value_serial FROM obj LEFT JOIN data ON (obj.hash=data.hash);
+  CREATE TABLE new_obj (partition SMALLINT UNSIGNED NOT NULL, oid BIGINT UNSIGNED NOT NULL, serial BIGINT UNSIGNED NOT NULL, data_id BIGINT UNSIGNED NULL, value_serial BIGINT UNSIGNED NULL, PRIMARY KEY (partition, serial, oid), KEY (partition, oid, serial), KEY (data_id)) ENGINE = InnoDB SELECT partition, oid, serial, data.id as data_id, value_serial FROM obj LEFT JOIN data ON (obj.hash=data.hash);
   DROP TABLE obj;
   RENAME TABLE new_obj TO obj;
   ALTER TABLE tobj CHANGE hash data_id BIGINT UNSIGNED NULL;

neo/client/app.py

@@ -959,7 +959,7 @@ class Application(object):
         tid_list = []
         # request a tid list for each partition
         for offset in xrange(self.pt.getPartitions()):
-            p = Packets.AskTIDsFrom(start, stop, limit, [offset])
+            p = Packets.AskTIDsFrom(start, stop, limit, offset)
             for node, conn in self.cp.iterateForObject(offset, readable=True):
                 try:
                     r = self._askStorage(conn, p)

neo/lib/config.py

@@ -90,3 +90,8 @@ class ConfigurationManager(object):
         # only from command line
         return util.bin(self.argument_list.get('uuid', None))
 
+    def getUpstreamCluster(self):
+        return self.__get('upstream_cluster', True)
+
+    def getUpstreamMasters(self):
+        return util.parseMasterList(self.__get('upstream_masters'))

neo/lib/event.py

@@ -79,6 +79,9 @@ class EpollEventManager(object):
         self.epoll.unregister(fd)
         del self.connection_dict[fd]
 
+    def isIdle(self):
+        return not (self._pending_processing or self.writer_set)
+
     def _addPendingConnection(self, conn):
         pending_processing = self._pending_processing
         if conn not in pending_processing:

neo/lib/protocol.py

@@ -48,6 +48,7 @@ class ErrorCodes(Enum):
     PROTOCOL_ERROR = Enum.Item(4)
     BROKEN_NODE = Enum.Item(5)
     ALREADY_PENDING = Enum.Item(7)
+    REPLICATION_ERROR = Enum.Item(8)
 ErrorCodes = ErrorCodes()
 
 class ClusterStates(Enum):
@@ -55,6 +56,9 @@ class ClusterStates(Enum):
     VERIFYING = Enum.Item(2)
     RUNNING = Enum.Item(3)
     STOPPING = Enum.Item(4)
+    STARTING_BACKUP = Enum.Item(5)
+    BACKINGUP = Enum.Item(6)
+    STOPPING_BACKUP = Enum.Item(7)
 ClusterStates = ClusterStates()
 
 class NodeTypes(Enum):
@@ -117,6 +121,7 @@ ZERO_TID = '\0' * 8
 ZERO_OID = '\0' * 8
 OID_LEN = len(INVALID_OID)
 TID_LEN = len(INVALID_TID)
+MAX_TID = '\x7f' + '\xff' * 7 # SQLite does not accept numbers above 2^63-1
 
 UUID_NAMESPACES = {
     NodeTypes.STORAGE: 'S',
@@ -723,6 +728,7 @@ class LastIDs(Packet):
         POID('last_oid'),
         PTID('last_tid'),
         PPTID('last_ptid'),
+        PTID('backup_tid'),
     )
 
 class PartitionTable(Packet):
@@ -760,16 +766,6 @@ class PartitionChanges(Packet):
         ),
     )
 
-class ReplicationDone(Packet):
-    """
-    Notify the master node that a partition has been successully replicated from
-    a storage to another.
-    S -> M
-    """
-    _fmt = PStruct('notify_replication_done',
-        PNumber('offset'),
-    )
-
 class StartOperation(Packet):
     """
     Tell a storage nodes to start an operation. Until a storage node receives
@@ -965,7 +961,7 @@ class GetObject(Packet):
     """
     Ask a stored object by its OID and a serial or a TID if given. If a serial
     is specified, the specified revision of an object will be returned. If
-    a TID is specified, an object right before the TID will be returned. S,C -> S.
+    a TID is specified, an object right before the TID will be returned. C -> S.
     Answer the requested object. S -> C.
     """
     _fmt = PStruct('ask_object',
@@ -1003,16 +999,14 @@ class TIDList(Packet):
 class TIDListFrom(Packet):
     """
     Ask for length TIDs starting at min_tid. The order of TIDs is ascending.
-    S -> S.
-    Answer the requested TIDs. S -> S
+    C -> S.
+    Answer the requested TIDs. S -> C
     """
     _fmt = PStruct('tid_list_from',
         PTID('min_tid'),
         PTID('max_tid'),
         PNumber('length'),
-        PList('partition_list',
         PNumber('partition'),
-        ),
     )
 
     _answer = PStruct('answer_tids',
@@ -1054,27 +1048,6 @@ class ObjectHistory(Packet):
         PFHistoryList,
     )
 
-class ObjectHistoryFrom(Packet):
-    """
-    Ask history information for a given object. The order of serials is
-    ascending, and starts at (or above) min_serial for min_oid. S -> S.
-    Answer the requested serials. S -> S.
-    """
-    _fmt = PStruct('ask_object_history',
-        POID('min_oid'),
-        PTID('min_serial'),
-        PTID('max_serial'),
-        PNumber('length'),
-        PNumber('partition'),
-    )
-
-    _answer = PStruct('ask_finish_transaction',
-        PDict('object_dict',
-            POID('oid'),
-            PFTidList,
-        ),
-    )
-
 class PartitionList(Packet):
     """
     All the following messages are for neoctl to admin node
@@ -1341,6 +1314,110 @@ class NotifyReady(Packet):
     """
     pass
 
+# replication
+
+class FetchTransactions(Packet):
+    """
+    S -> S
+    """
+    _fmt = PStruct('ask_transaction_list',
+        PNumber('partition'),
+        PNumber('length'),
+        PTID('min_tid'),
+        PTID('max_tid'),
+        PFTidList,           # already known transactions
+    )
+    _answer = PStruct('answer_transaction_list',
+        PTID('pack_tid'),
+        PTID('next_tid'),
+        PFTidList,           # transactions to delete
+    )
+
+class AddTransaction(Packet):
+    """
+    S -> S
+    """
+    _fmt = PStruct('add_transaction',
+        PTID('tid'),
+        PString('user'),
+        PString('description'),
+        PString('extension'),
+        PBoolean('packed'),
+        PFOidList,
+    )
+
+class FetchObjects(Packet):
+    """
+    S -> S
+    """
+    _fmt = PStruct('ask_object_list',
+        PNumber('partition'),
+        PNumber('length'),
+        PTID('min_tid'),
+        PTID('max_tid'),
+        POID('min_oid'),
+        PDict('object_dict', # already known objects
+            PTID('serial'),
+            PFOidList,
+        ),
+    )
+    _answer = PStruct('answer_object_list',
+        PTID('pack_tid'),
+        PTID('next_tid'),
+        POID('next_oid'),
+        PDict('object_dict', # objects to delete
+            PTID('serial'),
+            PFOidList,
+        ),
+    )
+
+class AddObject(Packet):
+    """
+    S -> S
+    """
+    _fmt = PStruct('add_object',
+        POID('oid'),
+        PTID('serial'),
+        PBoolean('compression'),
+        PChecksum('checksum'),
+        PString('data'),
+        PTID('data_serial'),
+    )
+
+class Replicate(Packet):
+    """
+    M -> S
+    """
+    _fmt = PStruct('replicate',
+        PTID('tid'),
+        PString('upstream_name'),
+        PDict('source_dict',
+            PNumber('partition'),
+            PAddress('address'),
+        )
+    )
+
+class ReplicationDone(Packet):
+    """
+    Notify the master node that a partition has been successully replicated from
+    a storage to another.
+    S -> M
+    """
+    _fmt = PStruct('notify_replication_done',
+        PNumber('offset'),
+        PTID('tid'),
+    )
+
+class Truncate(Packet):
+    """
+    M -> S
+    """
+    _fmt = PStruct('ask_truncate',
+        PTID('tid'),
+    )
+    _answer = PFEmpty
+
+
 StaticRegistry = {}
 def register(request, ignore_when_closed=None):
     """ Register a packet in the packet registry """
@@ -1516,16 +1593,12 @@ class Packets(dict):
                     ClusterState)
     NotifyLastOID = register(
                     NotifyLastOID)
-    NotifyReplicationDone = register(
-                    ReplicationDone)
     AskObjectUndoSerial, AnswerObjectUndoSerial = register(
                     ObjectUndoSerial)
     AskHasLock, AnswerHasLock = register(
                     HasLock)
     AskTIDsFrom, AnswerTIDsFrom = register(
                     TIDListFrom)
-    AskObjectHistoryFrom, AnswerObjectHistoryFrom = register(
-                    ObjectHistoryFrom)
     AskPack, AnswerPack = register(
                     Pack, ignore_when_closed=False)
     AskCheckTIDRange, AnswerCheckTIDRange = register(
@@ -1540,6 +1613,20 @@ class Packets(dict):
                     CheckCurrentSerial)
     NotifyTransactionFinished = register(
                     NotifyTransactionFinished)
+    Replicate = register(
+                    Replicate)
+    NotifyReplicationDone = register(
+                    ReplicationDone)
+    AskFetchTransactions, AnswerFetchTransactions = register(
+                    FetchTransactions)
+    AskFetchObjects, AnswerFetchObjects = register(
+                    FetchObjects)
+    AddTransaction = register(
+                    AddTransaction)
+    AddObject = register(
+                    AddObject)
+    AskTruncate, AnswerTruncate = register(
+                    Truncate)
 
 def Errors():
     registry_dict = {}

neo/lib/pt.py

@@ -150,6 +150,11 @@ class PartitionTable(object):
                 return True
         return False
 
+    def getCell(self, offset, uuid):
+        for cell in self.partition_list[offset]:
+            if cell.getUUID() == uuid:
+                return cell
+
     def setCell(self, offset, node, state):
         if state == CellStates.DISCARDED:
             return self.removeCell(offset, node)
@@ -157,28 +162,19 @@ class PartitionTable(object):
             raise PartitionTableException('Invalid node state')
 
         self.count_dict.setdefault(node, 0)
-        row = self.partition_list[offset]
-        if len(row) == 0:
-            # Create a new row.
-            row = [Cell(node, state), ]
-            if state != CellStates.FEEDING:
-                self.count_dict[node] += 1
-            self.partition_list[offset] = row
-
-            self.num_filled_rows += 1
-        else:
-            # XXX this can be slow, but it is necessary to remove a duplicate,
-            # if any.
-            for cell in row:
-                if cell.getNode() == node:
-                    row.remove(cell)
+        for cell in self.partition_list[offset]:
+            if cell.getNode() is node:
                 if not cell.isFeeding():
                     self.count_dict[node] -= 1
+                cell.setState(state)
                 break
+        else:
+            row = self.partition_list[offset]
+            self.num_filled_rows += not row
             row.append(Cell(node, state))
         if state != CellStates.FEEDING:
             self.count_dict[node] += 1
-        return (offset, node.getUUID(), state)
+        return offset, node.getUUID(), state
 
     def removeCell(self, offset, node):
         row = self.partition_list[offset]

neo/master/app.py

@@ -28,6 +28,10 @@ from neo.lib.event import EventManager
 from neo.lib.connection import ListeningConnection, ClientConnection
 from neo.lib.exception import ElectionFailure, PrimaryFailure, OperationFailure
 from neo.lib.util import dump
+
+class StateChangedException(Exception): pass
+
+from .backup_app import BackupApplication
 from .handlers import election, identification, secondary
 from .handlers import administration, client, storage, shutdown
 from .pt import PartitionTable
@@ -41,6 +45,8 @@ class Application(object):
     packing = None
     # Latest completely commited TID
     last_transaction = ZERO_TID
+    backup_tid = None
+    backup_app = None
 
     def __init__(self, config):
         # Internal attributes.
@@ -90,16 +96,29 @@ class Application(object):
 
         self._current_manager = None
 
+        # backup
+        upstream_cluster = config.getUpstreamCluster()
+        if upstream_cluster:
+            if upstream_cluster == self.name:
+                raise ValueError("upstream cluster name must be"
+                                 " different from cluster name")
+            self.backup_app = BackupApplication(self, upstream_cluster,
+                                                *config.getUpstreamMasters())
+
         registerLiveDebugger(on_log=self.log)
 
     def close(self):
         self.listening_conn = None
+        if self.backup_app is not None:
+            self.backup_app.close()
         self.nm.close()
         self.em.close()
         del self.__dict__
 
     def log(self):
         self.em.log()
+        if self.backup_app is not None:
+            self.backup_app.log()
         self.nm.log()
         self.tm.log()
         if self.pt is not None:
@@ -257,28 +276,30 @@ class Application(object):
         a shutdown.
         """
         neo.lib.logging.info('provide service')
-        em = self.em
+        poll = self.em.poll
         self.tm.reset()
 
         self.changeClusterState(ClusterStates.RUNNING)
 
         # Now everything is passive.
-        while True:
         try:
-                em.poll(1)
+            while True:
+                poll(1)
         except OperationFailure:
             # If not operational, send Stop Operation packets to storage
             # nodes and client nodes. Abort connections to client nodes.
             neo.lib.logging.critical('No longer operational')
+        except StateChangedException, e:
+            assert e.args[0] == ClusterStates.STARTING_BACKUP
+            self.backup_tid = tid = self.getLastTransaction()
+            self.pt.setBackupTidDict(dict((node.getUUID(), tid)
+                for node in self.nm.getStorageList(only_identified=True)))
         for node in self.nm.getIdentifiedList():
             if node.isStorage() or node.isClient():
                 node.notify(Packets.StopOperation())
                 if node.isClient():
                     node.getConnection().abort()
 
-                # Then, go back, and restart.
-                return
-
     def playPrimaryRole(self):
         neo.lib.logging.info(
                         'play the primary role with %r', self.listening_conn)
@@ -314,6 +335,12 @@ class Application(object):
         self.runManager(RecoveryManager)
         while True:
             self.runManager(VerificationManager)
+            if self.backup_tid:
+                if self.backup_app is None:
+                    raise RuntimeError("No upstream cluster to backup"
+                                       " defined in configuration")
+                self.backup_app.provideService()
+            else:
                 self.provideService()
 
     def playSecondaryRole(self):
@@ -364,7 +391,8 @@ class Application(object):
 
         # select the storage handler
         client_handler = client.ClientServiceHandler(self)
-        if state == ClusterStates.RUNNING:
+        if state in (ClusterStates.RUNNING, ClusterStates.STARTING_BACKUP,
+                     ClusterStates.BACKINGUP, ClusterStates.STOPPING_BACKUP):
             storage_handler = storage.StorageServiceHandler(self)
         elif self._current_manager is not None:
             storage_handler = self._current_manager.getHandler()
@@ -389,6 +417,7 @@ class Application(object):
                 handler = storage_handler
             else:
                 continue # keep handler
+            if type(handler) is not type(conn.getLastHandler()):
                 conn.setHandler(handler)
                 handler.connectionCompleted(conn)
         self.cluster_state = state
@@ -437,19 +466,13 @@ class Application(object):
         sys.exit()
 
     def identifyStorageNode(self, uuid, node):
+        if self.cluster_state == ClusterStates.STOPPING:
+            raise NotReadyError
         state = NodeStates.RUNNING
-        handler = None
-        if self.cluster_state == ClusterStates.RUNNING:
         if uuid is None or node is None:
             # same as for verification
             state = NodeStates.PENDING
-            handler = storage.StorageServiceHandler(self)
-        elif self.cluster_state == ClusterStates.STOPPING:
-            raise NotReadyError
-        else:
-            raise RuntimeError('unhandled cluster state: %s' %
-                    (self.cluster_state, ))
-        return (uuid, state, handler)
+        return uuid, state, storage.StorageServiceHandler(self)
 
     def identifyNode(self, node_type, uuid, node):
 

neo/master/backup_app.py

+##############################################################################
+#
+# Copyright (c) 2011 Nexedi SARL and Contributors. All Rights Reserved.
+#                    Julien Muchembled <jm@nexedi.com>
+#
+# WARNING: This program as such is intended to be used by professional
+# programmers who take the whole responsibility of assessing all potential
+# consequences resulting from its eventual inadequacies and bugs
+# End users who are looking for a ready-to-use solution with commercial
+# guarantees and support are strongly advised to contract a Free Software
+# Service Company
+#
+# This program is Free Software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+##############################################################################
+
+import random, weakref
+from bisect import bisect
+import neo.lib
+from neo.lib.bootstrap import BootstrapManager
+from neo.lib.connector import getConnectorHandler
+from neo.lib.exception import PrimaryFailure
+from neo.lib.node import NodeManager
+from neo.lib.protocol import CellStates, ClusterStates, NodeTypes, Packets
+from neo.lib.protocol import INVALID_TID, ZERO_TID
+from neo.lib.util import add64, u64, dump
+from .app import StateChangedException
+from .pt import PartitionTable
+from .handlers.backup import BackupHandler
+
+"""
+Backup algorithm
+
+This implementation relies on normal storage replication.
+Storage nodes that are specialised for backup are not in the same NEO cluster,
+but are managed by another master in a different cluster.
+
+When the cluster is in BACKINGUP state, its master acts like a client to the
+master of the main cluster. It gets notified of new data thanks to invalidation,
+and notifies in turn its storage nodes what/when to replicate.
+Storages stay in UP_TO_DATE state, even if partitions are synchronized up to
+different tids. Storage nodes remember they are in such state and when
+switching into RUNNING state, the cluster cuts the DB at the last TID for which
+we have all data.
+
+Out of backup storage nodes assigned to a partition, one is chosen as primary
+for that partition. It means only this node will fetch data from the upstream
+cluster, to minimize bandwidth between clusters. Other replicas will
+synchronize from the primary node.
+
+There is no UUID conflict between the 2 clusters:
+- Storage nodes connect anonymously to upstream.
+- Master node receives a new from upstream master and uses it only when
+  communicating with it.
+"""
+
+class BackupApplication(object):
+
+    pt = None
+
+    def __init__(self, app, name, master_addresses, connector_name):
+        self.app = weakref.proxy(app)
+        self.name = name
+        self.nm = NodeManager()
+        self.connector_handler = getConnectorHandler(connector_name)
+        for master_address in master_addresses:
+            self.nm.createMaster(address=master_address)
+
+    em = property(lambda self: self.app.em)
+
+    def close(self):
+        self.nm.close()
+        del self.__dict__
+
+    def log(self):
+        self.nm.log()
+        if self.pt is not None:
+            self.pt.log()
+
+    def provideService(self):
+        neo.lib.logging.info('provide backup')
+        poll = self.em.poll
+        app = self.app
+        pt = app.pt
+        while True:
+            app.changeClusterState(ClusterStates.STARTING_BACKUP)
+            bootstrap = BootstrapManager(self, self.name, NodeTypes.CLIENT)
+            # {offset -> node}
+            self.primary_partition_dict = {}
+            # [[tid]]
+            self.tid_list = tuple([] for _ in xrange(pt.getPartitions()))
+            try:
+                node, conn, uuid, num_partitions, num_replicas = \
+                    bootstrap.getPrimaryConnection(self.connector_handler)
+                try:
+                    app.changeClusterState(ClusterStates.BACKINGUP)
+                    del bootstrap, node
+                    if num_partitions != pt.getPartitions():
+                        raise RuntimeError("inconsistent number of partitions")
+                    self.pt = PartitionTable(num_partitions, num_replicas)
+                    conn.setHandler(BackupHandler(self))
+                    conn.ask(Packets.AskNodeInformation())
+                    conn.ask(Packets.AskPartitionTable())
+                    conn.ask(Packets.AskLastTransaction())
+                    # debug variable to log how big 'tid_list' can be.
+                    self.debug_tid_count = 0
+                    while True:
+                        poll(1)
+                except PrimaryFailure, msg:
+                    neo.lib.logging.error('upstream master is down: %s', msg)
+                finally:
+                    app.backup_tid = pt.getBackupTid()
+                    try:
+                        conn.close()
+                    except PrimaryFailure:
+                        pass
+                    try:
+                        del self.pt
+                    except AttributeError:
+                        pass
+            except StateChangedException, e:
+                app.changeClusterState(*e.args)
+                last_tid = app.getLastTransaction()
+                if last_tid < app.backup_tid:
+                    neo.lib.logging.warning(
+                        "Truncating at %s (last_tid was %s)",
+                        dump(app.backup_tid), dump(last_tid))
+                    p = Packets.AskTruncate(app.backup_tid)
+                    connection_list = []
+                    for node in app.nm.getStorageList(only_identified=True):
+                        conn = node.getConnection()
+                        conn.ask(p)
+                        connection_list.append(conn)
+                    for conn in connection_list:
+                        while conn.isPending():
+                            poll(1)
+                    app.setLastTransaction(app.backup_tid)
+                del app.backup_tid
+                break
+            finally:
+                del self.primary_partition_dict, self.tid_list
+
+    def nodeLost(self, node):
+        getCellList = self.app.pt.getCellList
+        trigger_set = set()
+        for offset, primary_node in self.primary_partition_dict.items():
+            if primary_node is not node:
+                continue
+            cell_list = getCellList(offset, readable=True)
+            cell = max(cell_list, key=lambda cell: cell.backup_tid)
+            tid = cell.backup_tid
+            self.primary_partition_dict[offset] = primary_node = cell.getNode()
+            p = Packets.Replicate(tid, '', {offset: primary_node.getAddress()})
+            for cell in cell_list:
+                cell.replicating = tid
+                if cell.backup_tid < tid:
+                    neo.lib.logging.debug(
+                        "ask %s to replicate partition %u up to %u from %r",
+                        dump(cell.getUUID()), offset,  u64(tid),
+                        dump(primary_node.getUUID()))
+                    cell.getNode().getConnection().notify(p)
+            trigger_set.add(primary_node)
+        for node in trigger_set:
+            self.triggerBackup(node)
+
+    def invalidatePartitions(self, tid, partition_set):
+        app = self.app
+        prev_tid = app.getLastTransaction()
+        app.setLastTransaction(tid)
+        pt = app.pt
+        getByUUID = app.nm.getByUUID
+        trigger_set = set()
+        for offset in xrange(pt.getPartitions()):
+            try:
+                last_max_tid = self.tid_list[offset][-1]
+            except IndexError:
+                last_max_tid = INVALID_TID
+            if offset in partition_set:
+                self.tid_list[offset].append(tid)
+                node_list = []
+                for cell in pt.getCellList(offset, readable=True):
+                    node = cell.getNode()
+                    assert node.isConnected()
+                    node_list.append(node)
+                    if last_max_tid <= cell.backup_tid:
+                        # This is the last time we can increase
+                        # 'backup_tid' without replication.
+                        neo.lib.logging.debug(
+                            "partition %u: updating backup_tid of %r to %u",
+                            offset, cell, u64(prev_tid))
+                        cell.backup_tid = prev_tid
+                assert node_list
+                trigger_set.update(node_list)
+                # Make sure we have a primary storage for this partition.
+                if offset not in self.primary_partition_dict:
+                    self.primary_partition_dict[offset] = \
+                        random.choice(node_list)
+            else:
+                # Partition not touched, so increase 'backup_tid' of all
+                # "up-to-date" replicas, without having to replicate.
+                for cell in pt.getCellList(offset, readable=True):
+                    if last_max_tid <= cell.backup_tid:
+                        cell.backup_tid = tid
+                        neo.lib.logging.debug(
+                            "partition %u: updating backup_tid of %r to %u",
+                            offset, cell, u64(tid))
+        for node in trigger_set:
+            self.triggerBackup(node)
+        count = sum(map(len, self.tid_list))
+        if self.debug_tid_count < count:
+            neo.lib.logging.debug("Maximum number of tracked tids: %u", count)
+            self.debug_tid_count = count
+
+    def triggerBackup(self, node):
+        tid_list = self.tid_list
+        tid = self.app.getLastTransaction()
+        replicate_list = []
+        for offset, cell in self.app.pt.iterNodeCell(node):
+            max_tid = tid_list[offset]
+            if max_tid and self.primary_partition_dict[offset] is node and \
+               max(cell.backup_tid, cell.replicating) < max_tid[-1]:
+                cell.replicating = tid
+                replicate_list.append(offset)
+        if not replicate_list:
+            return
+        getByUUID = self.nm.getByUUID
+        getCellList = self.pt.getCellList
+        source_dict = {}
+        address_set = set()
+        for offset in replicate_list:
+            cell_list = getCellList(offset, readable=True)
+            random.shuffle(cell_list)
+            assert cell_list, offset
+            for cell in cell_list:
+                addr = cell.getAddress()
+                if addr in address_set:
+                    break
+            else:
+                address_set.add(addr)
+            source_dict[offset] = addr
+            neo.lib.logging.debug(
+                "ask %s to replicate partition %u up to %u from %r",
+                dump(node.getUUID()), offset,  u64(tid), addr)
+        node.getConnection().notify(Packets.Replicate(
+            tid, self.name, source_dict))
+
+    def notifyReplicationDone(self, node, offset, tid):
+        app = self.app
+        cell = app.pt.getCell(offset, node.getUUID())
+        tid_list = self.tid_list[offset]
+        if tid_list: # may be empty if the cell is out-of-date
+                     # or if we're not fully initialized
+            if tid < tid_list[0]:
+                cell.replicating = tid
+            else:
+                try:
+                    tid = add64(tid_list[bisect(tid_list, tid)], -1)
+                except IndexError:
+                    tid = app.getLastTransaction()
+        neo.lib.logging.debug("partition %u: updating backup_tid of %r to %u",
+                              offset, cell, u64(tid))
+        cell.backup_tid = tid
+        # Forget tids we won't need anymore.
+        cell_list = app.pt.getCellList(offset, readable=True)
+        del tid_list[:bisect(tid_list, min(x.backup_tid for x in cell_list))]
+        primary_node = self.primary_partition_dict.get(offset)
+        primary = primary_node is node
+        result = None if primary else app.pt.setUpToDate(node, offset)
+        if app.getClusterState() == ClusterStates.BACKINGUP:
+            assert not cell.isOutOfDate()
+            if result: # was out-of-date
+                max_tid, = [x.backup_tid for x in cell_list
+                                         if x.getNode() is primary_node]
+                if tid < max_tid:
+                    cell.replicating = max_tid
+                    neo.lib.logging.debug(
+                        "ask %s to replicate partition %u up to %u from %r",
+                        dump(node.getUUID()), offset,  u64(max_tid),
+                        dump(primary_node.getUUID()))
+                    node.getConnection().notify(Packets.Replicate(max_tid,
+                        '', {offset: primary_node.getAddress()}))
+            else:
+                self.triggerBackup(node)
+                if primary:
+                    # Notify secondary storages that they can replicate from
+                    # primary ones, even if they are already replicating.
+                    p = Packets.Replicate(tid, '', {offset: node.getAddress()})
+                    for cell in cell_list:
+                        if max(cell.backup_tid, cell.replicating) < tid:
+                            cell.replicating = tid
+                            neo.lib.logging.debug(
+                                "ask %s to replicate partition %u up to %u from"
+                                " %r", dump(cell.getUUID()), offset,  u64(tid),
+                                dump(node.getUUID()))
+                            cell.getNode().getConnection().notify(p)
+        return result

neo/master/handlers/administration.py

@@ -18,15 +18,18 @@
 import neo
 
 from . import MasterHandler
+from ..app import StateChangedException
 from neo.lib.protocol import ClusterStates, NodeStates, Packets, ProtocolError
 from neo.lib.protocol import Errors
 from neo.lib.util import dump
 
 CLUSTER_STATE_WORKFLOW = {
     # destination: sources
-    ClusterStates.VERIFYING: set([ClusterStates.RECOVERING]),
-    ClusterStates.STOPPING: set([ClusterStates.RECOVERING,
-            ClusterStates.VERIFYING, ClusterStates.RUNNING]),
+    ClusterStates.VERIFYING: (ClusterStates.RECOVERING,),
+    ClusterStates.STARTING_BACKUP: (ClusterStates.RUNNING,
+                                    ClusterStates.STOPPING_BACKUP),
+    ClusterStates.STOPPING_BACKUP: (ClusterStates.BACKINGUP,
+                                    ClusterStates.STARTING_BACKUP),
 }
 
 class AdministrationHandler(MasterHandler):
@@ -42,16 +45,17 @@ class AdministrationHandler(MasterHandler):
         conn.answer(Packets.AnswerPrimary(app.uuid, []))
 
     def setClusterState(self, conn, state):
+        app = self.app
         # check request
-        if state not in CLUSTER_STATE_WORKFLOW:
+        try:
+            if app.cluster_state not in CLUSTER_STATE_WORKFLOW[state]:
+                raise ProtocolError('Can not switch to this state')
+        except KeyError:
             raise ProtocolError('Invalid state requested')
-        valid_current_states = CLUSTER_STATE_WORKFLOW[state]
-        if self.app.cluster_state not in valid_current_states:
-            raise ProtocolError('Cannot switch to this state')
 
         # change state
         if state == ClusterStates.VERIFYING:
-            storage_list = self.app.nm.getStorageList(only_identified=True)
+            storage_list = app.nm.getStorageList(only_identified=True)
             if not storage_list:
                 raise ProtocolError('Cannot exit recovery without any '
                     'storage node')
@@ -60,15 +64,18 @@ class AdministrationHandler(MasterHandler):
                 if node.getConnection().isPending():
                     raise ProtocolError('Cannot exit recovery now: node %r is '
                         'entering cluster' % (node, ))
-            self.app._startup_allowed = True
-        else:
-            self.app.changeClusterState(state)
+            app._startup_allowed = True
+            state = app.cluster_state
+        elif state == ClusterStates.STARTING_BACKUP:
+            if app.tm.hasPending() or app.nm.getClientList(True):
+                raise ProtocolError("Can not switch to %s state with pending"
+                    " transactions or connected clients" % state)
+        elif state != ClusterStates.STOPPING_BACKUP:
+            app.changeClusterState(state)
 
-        # answer
         conn.answer(Errors.Ack('Cluster state changed'))
-        if state == ClusterStates.STOPPING:
-            self.app.cluster_state = state
-            self.app.shutdown()
+        if state != app.cluster_state:
+            raise StateChangedException(state)
 
     def setNodeState(self, conn, uuid, state, modify_partition_table):
         neo.lib.logging.info("set node state for %s-%s : %s" %

neo/master/handlers/backup.py

+##############################################################################
+#
+# Copyright (c) 2011 Nexedi SARL and Contributors. All Rights Reserved.
+#                    Julien Muchembled <jm@nexedi.com>
+#
+# WARNING: This program as such is intended to be used by professional
+# programmers who take the whole responsibility of assessing all potential
+# consequences resulting from its eventual inadequacies and bugs
+# End users who are looking for a ready-to-use solution with commercial
+# guarantees and support are strongly advised to contract a Free Software
+# Service Company
+#
+# This program is Free Software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+##############################################################################
+
+from neo.lib.exception import PrimaryFailure
+from neo.lib.handler import EventHandler
+from neo.lib.protocol import CellStates
+
+class BackupHandler(EventHandler):
+    """Handler dedicated to upstream master during BACKINGUP state"""
+
+    def connectionLost(self, conn, new_state):
+        if self.app.app.listening_conn: # if running
+            raise PrimaryFailure('connection lost')
+
+    def answerPartitionTable(self, conn, ptid, row_list):
+        self.app.pt.load(ptid, row_list, self.app.nm)
+
+    def notifyPartitionChanges(self, conn, ptid, cell_list):
+        self.app.pt.update(ptid, cell_list, self.app.nm)
+
+    def answerNodeInformation(self, conn):
+        pass
+
+    def notifyNodeInformation(self, conn, node_list):
+        self.app.nm.update(node_list)
+
+    def answerLastTransaction(self, conn, tid):
+        app = self.app
+        app.invalidatePartitions(tid, set(xrange(app.pt.getPartitions())))
+
+    def invalidateObjects(self, conn, tid, oid_list):
+        app = self.app
+        getPartition = app.app.pt.getPartition
+        partition_set = set(map(getPartition, oid_list))
+        partition_set.add(getPartition(tid))
+        app.invalidatePartitions(tid, partition_set)

neo/master/handlers/storage.py

@@ -16,7 +16,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 
 import neo.lib
-from neo.lib.protocol import Packets, ProtocolError
+from neo.lib.protocol import ClusterStates, Packets, ProtocolError
 from neo.lib.exception import OperationFailure
 from neo.lib.util import dump
 from neo.lib.connector import ConnectorConnectionClosedException
@@ -45,14 +45,18 @@ class StorageServiceHandler(BaseServiceHandler):
         if not app.pt.operational():
             raise OperationFailure, 'cannot continue operation'
         app.tm.forget(conn.getUUID())
+        if app.getClusterState() == ClusterStates.BACKINGUP:
+            app.backup_app.nodeLost(node)
         if app.packing is not None:
             self.answerPack(conn, False)
 
     def askLastIDs(self, conn):
         app = self.app
-        loid = app.tm.getLastOID()
-        ltid = app.tm.getLastTID()
-        conn.answer(Packets.AnswerLastIDs(loid, ltid, app.pt.getID()))
+        conn.answer(Packets.AnswerLastIDs(
+            app.tm.getLastOID(),
+            app.tm.getLastTID(),
+            app.pt.getID(),
+            app.backup_tid))
 
     def askUnfinishedTransactions(self, conn):
         tm = self.app.tm
@@ -68,15 +72,26 @@ class StorageServiceHandler(BaseServiceHandler):
         # transaction locked on this storage node
         self.app.tm.lock(ttid, conn.getUUID())
 
-    def notifyReplicationDone(self, conn, offset):
-        node = self.app.nm.getByUUID(conn.getUUID())
-        neo.lib.logging.debug("%s is up for offset %s" % (node, offset))
+    def notifyReplicationDone(self, conn, offset, tid):
+        app = self.app
+        node = app.nm.getByUUID(conn.getUUID())
+        if app.backup_tid:
+            cell_list = app.backup_app.notifyReplicationDone(node, offset, tid)
+            if not cell_list:
+                return
+        else:
             try:
                 cell_list = self.app.pt.setUpToDate(node, offset)
+                if not cell_list:
+                    raise ProtocolError('Non-oudated partition')
             except PartitionTableException, e:
                 raise ProtocolError(str(e))
+        neo.lib.logging.debug("%s is up for offset %s", node, offset)
         self.app.broadcastPartitionChanges(cell_list)
 
+    def answerTruncate(self, conn):
+        pass
+
     def answerPack(self, conn, status):
         app = self.app
         if app.packing is not None:

neo/master/pt.py

@@ -17,11 +17,25 @@
 
 import neo.lib.pt
 from struct import pack, unpack
-from neo.lib.protocol import CellStates
-from neo.lib.pt import PartitionTableException
-from neo.lib.pt import PartitionTable
+from neo.lib.protocol import CellStates, ZERO_TID
 
-class PartitionTable(PartitionTable):
+
+class Cell(neo.lib.pt.Cell):
+
+    replicating = ZERO_TID
+
+    def setState(self, state):
+        try:
+            if CellStates.OUT_OF_DATE == state != self.state:
+                del self.backup_tid, self.replicating
+        except AttributeError:
+            pass
+        return super(Cell, self).setState(state)
+
+neo.lib.pt.Cell = Cell
+
+
+class PartitionTable(neo.lib.pt.PartitionTable):
     """This class manages a partition table for the primary master node"""
 
     def setID(self, id):
@@ -54,7 +68,7 @@ class PartitionTable(PartitionTable):
             row = []
             for _ in xrange(repeats):
                 node = node_list[index]
-                row.append(neo.lib.pt.Cell(node))
+                row.append(Cell(node))
                 self.count_dict[node] = self.count_dict.get(node, 0) + 1
                 index += 1
                 if index == len(node_list):
@@ -88,7 +102,7 @@ class PartitionTable(PartitionTable):
                         node_list = [c.getNode() for c in row]
                         n = self.findLeastUsedNode(node_list)
                         if n is not None:
-                            row.append(neo.lib.pt.Cell(n,
+                            row.append(Cell(n,
                                     CellStates.OUT_OF_DATE))
                             self.count_dict[n] += 1
                             cell_list.append((offset, n.getUUID(),
@@ -132,11 +146,11 @@ class PartitionTable(PartitionTable):
         # check the partition is assigned and known as outdated
         for cell in self.getCellList(offset):
             if cell.getUUID() == uuid:
-                if not cell.isOutOfDate():
-                    raise PartitionTableException('Non-oudated partition')
+                if cell.isOutOfDate():
                     break
+                return
         else:
-            raise PartitionTableException('Non-assigned partition')
+            raise neo.lib.pt.PartitionTableException('Non-assigned partition')
 
         # update the partition table
         cell_list = [self.setCell(offset, node, CellStates.UP_TO_DATE)]
@@ -177,7 +191,7 @@ class PartitionTable(PartitionTable):
 
             else:
                 if num_cells <= self.nr:
-                    row.append(neo.lib.pt.Cell(node, CellStates.OUT_OF_DATE))
+                    row.append(Cell(node, CellStates.OUT_OF_DATE))
                     cell_list.append((offset, node.getUUID(),
                         CellStates.OUT_OF_DATE))
                     node_count += 1
@@ -196,7 +210,7 @@ class PartitionTable(PartitionTable):
                                           CellStates.FEEDING))
                         # Don't count a feeding cell.
                         self.count_dict[max_cell.getNode()] -= 1
-                    row.append(neo.lib.pt.Cell(node, CellStates.OUT_OF_DATE))
+                    row.append(Cell(node, CellStates.OUT_OF_DATE))
                     cell_list.append((offset, node.getUUID(),
                                       CellStates.OUT_OF_DATE))
                     node_count += 1
@@ -277,7 +291,7 @@ class PartitionTable(PartitionTable):
                 node = self.findLeastUsedNode([cell.getNode() for cell in row])
                 if node is None:
                     break
-                row.append(neo.lib.pt.Cell(node, CellStates.OUT_OF_DATE))
+                row.append(Cell(node, CellStates.OUT_OF_DATE))
                 changed_cell_list.append((offset, node.getUUID(),
                     CellStates.OUT_OF_DATE))
                 self.count_dict[node] += 1
@@ -309,6 +323,13 @@ class PartitionTable(PartitionTable):
                         CellStates.OUT_OF_DATE))
         return change_list
 
+    def iterNodeCell(self, node):
+        for offset, row in enumerate(self.partition_list):
+            for cell in row:
+                if cell.getNode() is node:
+                    yield offset, cell
+                    break
+
     def getUpToDateCellNodeSet(self):
         """
         Return a set of all nodes which are part of at least one UP TO DATE
@@ -329,3 +350,16 @@ class PartitionTable(PartitionTable):
             for cell in row
             if cell.isOutOfDate())
 
+    def setBackupTidDict(self, backup_tid_dict):
+        for row in self.partition_list:
+            for cell in row:
+                cell.backup_tid = backup_tid_dict.get(cell.getUUID(),
+                                                      ZERO_TID)
+
+    def getBackupTid(self):
+        try:
+            return min(max(cell.backup_tid for cell in row
+                                           if not cell.isOutOfDate())
+                       for row in self.partition_list)
+        except ValueError:
+            return ZERO_TID

neo/master/recovery.py

@@ -33,6 +33,7 @@ class RecoveryManager(MasterHandler):
         super(RecoveryManager, self).__init__(app)
         # The target node's uuid to request next.
         self.target_ptid = None
+        self.backup_tid_dict = {}
 
     def getHandler(self):
         return self
@@ -98,6 +99,9 @@ class RecoveryManager(MasterHandler):
             app.tm.setLastOID(ZERO_OID)
             pt.make(allowed_node_set)
             self._broadcastPartitionTable(pt.getID(), pt.getRowList())
+        elif app.backup_tid:
+            pt.setBackupTidDict(self.backup_tid_dict)
+            app.backup_tid = pt.getBackupTid()
 
         app.setLastTransaction(app.tm.getLastTID())
         neo.lib.logging.debug(
@@ -118,7 +122,7 @@ class RecoveryManager(MasterHandler):
         # ask the last IDs to perform the recovery
         conn.ask(Packets.AskLastIDs())
 
-    def answerLastIDs(self, conn, loid, ltid, lptid):
+    def answerLastIDs(self, conn, loid, ltid, lptid, backup_tid):
         # Get max values.
         if loid is not None:
             self.app.tm.setLastOID(loid)
@@ -128,6 +132,7 @@ class RecoveryManager(MasterHandler):
             # something newer
             self.target_ptid = lptid
             conn.ask(Packets.AskPartitionTable())
+        self.backup_tid_dict[conn.getUUID()] = backup_tid
 
     def answerPartitionTable(self, conn, ptid, row_list):
         if ptid != self.target_ptid:
@@ -136,6 +141,7 @@ class RecoveryManager(MasterHandler):
                     dump(self.target_ptid))
         else:
             self._broadcastPartitionTable(ptid, row_list)
+            self.app.backup_tid = self.backup_tid_dict[conn.getUUID()]
 
     def _broadcastPartitionTable(self, ptid, row_list):
         try:

neo/master/verification.py

@@ -113,19 +113,21 @@ class VerificationManager(BaseServiceHandler):
 
     def verifyData(self):
         """Verify the data in storage nodes and clean them up, if necessary."""
-
-        em, nm = self.app.em, self.app.nm
+        app = self.app
 
         # wait for any missing node
         neo.lib.logging.debug('waiting for the cluster to be operational')
-        while not self.app.pt.operational():
-            em.poll(1)
+        while not app.pt.operational():
+            app.em.poll(1)
+        if app.backup_tid:
+            return
 
         neo.lib.logging.info('start to verify data')
+        getIdentifiedList = app.nm.getIdentifiedList
 
         # Gather all unfinished transactions.
         self._askStorageNodesAndWait(Packets.AskUnfinishedTransactions(),
-            [x for x in self.app.nm.getIdentifiedList() if x.isStorage()])
+            [x for x in getIdentifiedList() if x.isStorage()])
 
         # Gather OIDs for each unfinished TID, and verify whether the
         # transaction can be finished or must be aborted. This could be
@@ -136,17 +138,16 @@ class VerificationManager(BaseServiceHandler):
             if uuid_set is None:
                 packet = Packets.DeleteTransaction(tid, self._oid_set or [])
                 # Make sure that no node has this transaction.
-                for node in self.app.nm.getIdentifiedList():
+                for node in getIdentifiedList():
                     if node.isStorage():
                         node.notify(packet)
             else:
                 packet = Packets.CommitTransaction(tid)
-                for node in self.app.nm.getIdentifiedList(pool_set=uuid_set):
+                for node in getIdentifiedList(pool_set=uuid_set):
                     node.notify(packet)
             self._oid_set = set()
-
             # If possible, send the packets now.
-            em.poll(0)
+            app.em.poll(0)
 
     def verifyTransaction(self, tid):
         em = self.app.em
@@ -189,11 +190,11 @@ class VerificationManager(BaseServiceHandler):
 
         return uuid_set
 
-    def answerLastIDs(self, conn, loid, ltid, lptid):
+    def answerLastIDs(self, conn, loid, ltid, lptid, backup_tid):
         # FIXME: this packet should not allowed here, the master already
         # accepted the current partition table end IDs. As there were manually
         # approved during recovery, there is no need to check them here.
-        pass
+        raise RuntimeError
 
     def answerUnfinishedTransactions(self, conn, max_tid, tid_list):
         uuid = conn.getUUID()

neo/scripts/runner.py

@@ -54,15 +54,10 @@ UNIT_TEST_MODULES = [
     'neo.tests.storage.testInitializationHandler',
     'neo.tests.storage.testMasterHandler',
     'neo.tests.storage.testStorageApp',
-    'neo.tests.storage.testStorageHandler',
-    'neo.tests.storage.testStorageMySQLdb',
-    'neo.tests.storage.testStorageBTree',
+    'neo.tests.storage.testStorage' + os.getenv('NEO_TESTS_ADAPTER', 'SQLite'),
     'neo.tests.storage.testVerificationHandler',
     'neo.tests.storage.testIdentificationHandler',
     'neo.tests.storage.testTransactions',
-    'neo.tests.storage.testReplicationHandler',
-    'neo.tests.storage.testReplicator',
-    'neo.tests.storage.testReplication',
     # client application
     'neo.tests.client.testClientApp',
     'neo.tests.client.testMasterHandler',
@@ -70,6 +65,7 @@ UNIT_TEST_MODULES = [
     'neo.tests.client.testConnectionPool',
     # light functional tests
     'neo.tests.threaded.test',
+    'neo.tests.threaded.testReplication',
 ]
 
 FUNC_TEST_MODULES = [

neo/storage/app.py

@@ -113,28 +113,21 @@ class Application(object):
         """Load persistent configuration data from the database.
         If data is not present, generate it."""
 
-        def NoneOnKeyError(getter):
-            try:
-                return getter()
-            except KeyError:
-                return None
         dm = self.dm
 
         # check cluster name
-        try:
-            dm_name = dm.getName()
-        except KeyError:
+        name = dm.getName()
+        if name is None:
             dm.setName(self.name)
-        else:
-            if dm_name != self.name:
-                raise RuntimeError('name %r does not match with the '
-                    'database: %r' % (self.name, dm_name))
+        elif name != self.name:
+            raise RuntimeError('name %r does not match with the database: %r'
+                               % (self.name, dm_name))
 
         # load configuration
-        self.uuid = NoneOnKeyError(dm.getUUID)
-        num_partitions = NoneOnKeyError(dm.getNumPartitions)
-        num_replicas = NoneOnKeyError(dm.getNumReplicas)
-        ptid = NoneOnKeyError(dm.getPTID)
+        self.uuid = dm.getUUID()
+        num_partitions = dm.getNumPartitions()
+        num_replicas = dm.getNumReplicas()
+        ptid = dm.getPTID()
 
         # check partition table configuration
         if num_partitions is not None and num_replicas is not None:
@@ -152,10 +145,7 @@ class Application(object):
 
     def loadPartitionTable(self):
         """Load a partition table from the database."""
-        try:
         ptid = self.dm.getPTID()
-        except KeyError:
-            ptid = None
         cell_list = self.dm.getPartitionTable()
         new_cell_list = []
         for offset, uuid, state in cell_list:
@@ -216,9 +206,7 @@ class Application(object):
             except OperationFailure, msg:
                 neo.lib.logging.error('operation stopped: %s', msg)
             except PrimaryFailure, msg:
-                self.replicator.masterLost()
                 neo.lib.logging.error('primary master is down: %s', msg)
-                self.master_node = None
 
     def connectToPrimary(self):
         """Find a primary master node, and connect to it.
@@ -296,6 +284,7 @@ class Application(object):
         neo.lib.logging.info('doing operation')
 
         _poll = self._poll
+        isIdle = self.em.isIdle
 
         handler = master.MasterOperationHandler(self)
         self.master_conn.setHandler(handler)
@@ -304,16 +293,21 @@ class Application(object):
         self.dm.dropUnfinishedData()
         self.tm.reset()
 
+        self.task_queue = task_queue = deque()
+        try:
             while True:
+                while task_queue and isIdle():
+                    try:
+                        task_queue[-1].next()
+                        task_queue.rotate()
+                    except StopIteration:
+                        task_queue.pop()
                 _poll()
-            if self.replicator.pending():
-                # Call processDelayedTasks before act, so tasks added in the
-                # act call are executed after one poll call, so that sent
-                # packets are already on the network and delayed task
-                # processing happens in parallel with the same task on the
-                # other storage node.
-                self.replicator.processDelayedTasks()
-                self.replicator.act()
+        finally:
+            del self.task_queue
+            # Abort any replication, whether we are feeding or out-of-date.
+            for node in self.nm.getStorageList(only_identified=True):
+                node.getConnection().close()
 
     def wait(self):
         # change handler
@@ -368,6 +362,13 @@ class Application(object):
             neo.lib.logging.info('  %r:%r: %r:%r %r %r', key, event.__name__,
                 _msg_id, _conn, args)
 
+    def newTask(self, iterator):
+        try:
+            iterator.next()
+        except StopIteration:
+            return
+        self.task_queue.appendleft(iterator)
+
     def shutdown(self, erase=False):
         """Close all connections and exit"""
         for c in self.em.getConnectionList():

neo/storage/database/__init__.py

@@ -15,10 +15,13 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 
+LOG_QUERIES = False
+
 from neo.lib.exception import DatabaseFailure
 from .manager import DatabaseManager
+from .sqlite import SQLiteDatabaseManager
 
-DATABASE_MANAGER_DICT = {}
+DATABASE_MANAGER_DICT = {'SQLite': SQLiteDatabaseManager}
 
 try:
     from .mysqldb import MySQLDatabaseManager
@@ -27,17 +30,6 @@ except ImportError:
 else:
     DATABASE_MANAGER_DICT['MySQL'] = MySQLDatabaseManager
 
-try:
-    from .btree import BTreeDatabaseManager
-except ImportError:
-    pass
-else:
-    # XXX: warning: name might change in the future.
-    DATABASE_MANAGER_DICT['BTree'] = BTreeDatabaseManager
-
-if not DATABASE_MANAGER_DICT:
-    raise ImportError('No database back-end available.')
-
 def buildDatabaseManager(name, args=(), kw={}):
     if name is None:
         name = DATABASE_MANAGER_DICT.keys()[0]

neo/storage/database/btree.py

-#
-# Copyright (C) 2010  Nexedi SA
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-"""
-Naive b-tree implementation.
-Simple, though not so well tested.
-Not persistent ! (no data retained after process exit)
-"""
-
-from BTrees.OOBTree import OOBTree as _OOBTree
-import neo.lib
-from hashlib import sha1
-
-from . import DatabaseManager
-from .manager import CreationUndone
-from neo.lib.protocol import CellStates, ZERO_HASH, ZERO_OID, ZERO_TID
-from neo.lib import util
-
-# Keep dropped trees in memory to avoid instanciating when not needed.
-TREE_POOL = []
-# How many empty BTree istance to keep in ram
-MAX_TREE_POOL_SIZE = 100
-
-def batchDelete(tree, tester_callback=None, deleter_callback=None, **kw):
-    """
-    Iter over given BTree and delete found entries.
-    tree BTree
-        Tree to delete entries from.
-    tester_callback function(key, value) -> boolean
-        Called with each key, value pair found in tree.
-        If return value is true, delete entry. Otherwise, skip to next key.
-    deleter_callback function(tree, key_list) -> None (None)
-        Custom function to delete items
-    **kw
-        Keyword arguments for tree.items .
-    """
-    if tester_callback is None:
-        key_list = list(safeIter(tree.iterkeys, **kw))
-    else:
-        key_list = [key for key, value in safeIter(tree.iteritems, **kw)
-                        if tester_callback(key, value)]
-    if deleter_callback is None:
-        for key in key_list:
-            del tree[key]
-    else:
-        deleter_callback(tree, key_list)
-
-def OOBTree():
-    try:
-        result = TREE_POOL.pop()
-    except IndexError:
-        result = _OOBTree()
-    # Next btree we prune will have room, restore prune method
-    global prune
-    prune = _prune
-    return result
-
-def _prune(tree):
-    tree.clear()
-    TREE_POOL.append(tree)
-    if len(TREE_POOL) >= MAX_TREE_POOL_SIZE:
-        # Already at/above max pool size, disable ourselve.
-        global prune
-        prune = _noPrune
-
-def _noPrune(_):
-    pass
-
-prune = _prune
-
-def iterObjSerials(obj):
-    for tserial in obj.values():
-        for serial in tserial.keys():
-            yield serial
-
-def descItems(tree):
-    try:
-        key = tree.maxKey()
-    except ValueError:
-        pass
-    else:
-        while True:
-            yield (key, tree[key])
-            try:
-                key = tree.maxKey(key - 1)
-            except ValueError:
-                break
-
-def descKeys(tree):
-    try:
-        key = tree.maxKey()
-    except ValueError:
-        pass
-    else:
-        while True:
-            yield key
-            try:
-                key = tree.maxKey(key - 1)
-            except ValueError:
-                break
-
-def safeIter(func, *args, **kw):
-    try:
-        some_list = func(*args, **kw)
-    except ValueError:
-        some_list = []
-    return some_list
-
-class BTreeDatabaseManager(DatabaseManager):
-
-    def __init__(self, database, wait):
-        super(BTreeDatabaseManager, self).__init__(database, wait)
-        self.setup(reset=1)
-
-    @property
-    def _num_partitions(self):
-        return self._config['partitions']
-
-    def setup(self, reset=0):
-        if reset:
-            self._data = OOBTree()
-            self._obj = OOBTree()
-            self._trans = OOBTree()
-            self._tobj = OOBTree()
-            self._ttrans = OOBTree()
-            self._pt = {}
-            self._config = {}
-            self._uncommitted_data = {}
-
-    def _begin(self):
-        pass
-
-    def _commit(self):
-        pass
-
-    def _rollback(self):
-        pass
-
-    def getConfiguration(self, key):
-        return self._config[key]
-
-    def _setConfiguration(self, key, value):
-        self._config[key] = value
-
-    def _setPackTID(self, tid):
-        self._setConfiguration('_pack_tid', tid)
-
-    def _getPackTID(self):
-        try:
-            result = int(self.getConfiguration('_pack_tid'))
-        except KeyError:
-            result = -1
-        return result
-
-    def getPartitionTable(self):
-        pt = []
-        append = pt.append
-        for (offset, uuid), state in self._pt.iteritems():
-            append((offset, uuid, state))
-        return pt
-
-    def getLastTID(self, all=True):
-        try:
-            ltid = self._trans.maxKey()
-        except ValueError:
-            ltid = None
-        if all:
-            try:
-                tmp_ltid = self._ttrans.maxKey()
-            except ValueError:
-                tmp_ltid = None
-            tmp_serial = None
-            for tserial in self._tobj.values():
-                try:
-                    max_tmp_serial = tserial.maxKey()
-                except ValueError:
-                    pass
-                else:
-                    tmp_serial = max(tmp_serial, max_tmp_serial)
-            ltid = max(ltid, tmp_ltid, tmp_serial)
-        if ltid is not None:
-            ltid = util.p64(ltid)
-        return ltid
-
-    def getUnfinishedTIDList(self):
-        p64 = util.p64
-        tid_set = set(p64(x) for x in self._ttrans.keys())
-        tid_set.update(p64(x) for x in iterObjSerials(self._tobj))
-        return list(tid_set)
-
-    def objectPresent(self, oid, tid, all=True):
-        u64 = util.u64
-        oid = u64(oid)
-        tid = u64(tid)
-        try:
-            result = self._obj[oid].has_key(tid)
-        except KeyError:
-            if all:
-                try:
-                    result = self._tobj[oid].has_key(tid)
-                except KeyError:
-                    result = False
-            else:
-                result = False
-        return result
-
-    def _getObject(self, oid, tid=None, before_tid=None):
-        tserial = self._obj.get(oid)
-        if tserial is not None:
-            if tid is None:
-                try:
-                    if before_tid is None:
-                        tid = tserial.maxKey()
-                    else:
-                        tid = tserial.maxKey(before_tid - 1)
-                except ValueError:
-                    return False
-            try:
-                checksum, value_serial = tserial[tid]
-            except KeyError:
-                return False
-            try:
-                next_serial = tserial.minKey(tid + 1)
-            except ValueError:
-                next_serial = None
-            if checksum is None:
-                compression = data = None
-            else:
-                compression, data, _ = self._data[checksum]
-            return tid, next_serial, compression, checksum, data, value_serial
-
-    def doSetPartitionTable(self, ptid, cell_list, reset):
-        pt = self._pt
-        if reset:
-            pt.clear()
-        for offset, uuid, state in cell_list:
-            # TODO: this logic should move out of database manager
-            # add 'dropCells(cell_list)' to API and use one query
-            key = (offset, uuid)
-            if state == CellStates.DISCARDED:
-                pt.pop(key, None)
-            else:
-                pt[key] = int(state)
-        self.setPTID(ptid)
-
-    def changePartitionTable(self, ptid, cell_list):
-        self.doSetPartitionTable(ptid, cell_list, False)
-
-    def setPartitionTable(self, ptid, cell_list):
-        self.doSetPartitionTable(ptid, cell_list, True)
-
-    def _oidDeleterCallback(self, oid):
-        data = self._data
-        uncommitted_data = self._uncommitted_data
-        def deleter_callback(tree, key_list):
-            for tid in key_list:
-                checksum = tree.pop(tid)[0]
-                if checksum:
-                    index = data[checksum][2]
-                    index.remove((oid, tid))
-                    if not index and checksum not in uncommitted_data:
-                        del data[checksum]
-        return deleter_callback
-
-    def _objDeleterCallback(self, tree, key_list):
-        data = self._data
-        checksum_list = []
-        checksum_set = set()
-        for oid in key_list:
-            tserial = tree.pop(oid)
-            for tid, (checksum, _) in tserial.items():
-                if checksum:
-                    index = data[checksum][2]
-                    try:
-                        index.remove((oid, tid))
-                    except KeyError: # _tobj
-                        checksum_list.append(checksum)
-                    checksum_set.add(checksum)
-            prune(tserial)
-        self.unlockData(checksum_list)
-        self._pruneData(checksum_set)
-
-    def dropPartitions(self, offset_list):
-        offset_list = frozenset(offset_list)
-        num_partitions = self._num_partitions
-        def same_partition(key, _):
-            return key % num_partitions in offset_list
-        batchDelete(self._obj, same_partition, self._objDeleterCallback)
-        batchDelete(self._trans, same_partition)
-
-    def dropUnfinishedData(self):
-        batchDelete(self._tobj, deleter_callback=self._objDeleterCallback)
-        self._ttrans.clear()
-
-    def storeTransaction(self, tid, object_list, transaction, temporary=True):
-        u64 = util.u64
-        tid = u64(tid)
-        if temporary:
-            obj = self._tobj
-            trans = self._ttrans
-        else:
-            obj = self._obj
-            trans = self._trans
-        data = self._data
-        for oid, checksum, value_serial in object_list:
-            oid = u64(oid)
-            if value_serial:
-                value_serial = u64(value_serial)
-                checksum = self._obj[oid][value_serial][0]
-                if temporary:
-                    self.storeData(checksum)
-            if checksum:
-                if not temporary:
-                    data[checksum][2].add((oid, tid))
-            try:
-                tserial = obj[oid]
-            except KeyError:
-                tserial = obj[oid] = OOBTree()
-            tserial[tid] = checksum, value_serial
-
-        if transaction is not None:
-            oid_list, user, desc, ext, packed = transaction
-            trans[tid] = (tuple(oid_list), user, desc, ext, packed)
-
-    def _pruneData(self, checksum_list):
-        data = self._data
-        for checksum in set(checksum_list).difference(self._uncommitted_data):
-            if not data[checksum][2]:
-                del data[checksum]
-
-    def _storeData(self, checksum, data, compression):
-        try:
-            if self._data[checksum][:2] != (compression, data):
-                raise AssertionError("hash collision")
-        except KeyError:
-            self._data[checksum] = compression, data, set()
-        return checksum
-
-    def finishTransaction(self, tid):
-        tid = util.u64(tid)
-        self._popTransactionFromTObj(tid, True)
-        ttrans = self._ttrans
-        try:
-            data = ttrans[tid]
-        except KeyError:
-            pass
-        else:
-            del ttrans[tid]
-            self._trans[tid] = data
-
-    def _popTransactionFromTObj(self, tid, to_obj):
-        checksum_list = []
-        if to_obj:
-            deleter_callback = None
-            obj = self._obj
-            def callback(oid, data):
-                try:
-                    tserial = obj[oid]
-                except KeyError:
-                    tserial = obj[oid] = OOBTree()
-                tserial[tid] = data
-                checksum = data[0]
-                if checksum:
-                    self._data[checksum][2].add((oid, tid))
-                    checksum_list.append(checksum)
-        else:
-            deleter_callback = self._objDeleterCallback
-            callback = lambda oid, data: None
-        def tester_callback(oid, tserial):
-            try:
-                data = tserial[tid]
-            except KeyError:
-                pass
-            else:
-                del tserial[tid]
-                callback(oid, data)
-            return not tserial
-        batchDelete(self._tobj, tester_callback, deleter_callback)
-        self.unlockData(checksum_list)
-
-    def deleteTransaction(self, tid, oid_list=()):
-        u64 = util.u64
-        tid = u64(tid)
-        self._popTransactionFromTObj(tid, False)
-        try:
-            del self._ttrans[tid]
-        except KeyError:
-            pass
-        for oid in oid_list:
-            self._deleteObject(u64(oid), tid)
-        try:
-            del self._trans[tid]
-        except KeyError:
-            pass
-
-    def deleteTransactionsAbove(self, partition, tid, max_tid):
-        num_partitions = self._num_partitions
-        def same_partition(key, _):
-            return key % num_partitions == partition
-        batchDelete(self._trans, same_partition,
-            min=util.u64(tid), max=util.u64(max_tid))
-
-    def deleteObject(self, oid, serial=None):
-        u64 = util.u64
-        self._deleteObject(u64(oid), serial and u64(serial))
-
-    def _deleteObject(self, oid, serial=None):
-        obj = self._obj
-        try:
-            tserial = obj[oid]
-        except KeyError:
-            return
-        batchDelete(tserial, deleter_callback=self._oidDeleterCallback(oid),
-                    min=serial, max=serial)
-        if not tserial:
-            del obj[oid]
-
-    def deleteObjectsAbove(self, partition, oid, serial, max_tid):
-        obj = self._obj
-        u64 = util.u64
-        oid = u64(oid)
-        serial = u64(serial)
-        max_tid = u64(max_tid)
-        num_partitions = self._num_partitions
-        if oid % num_partitions == partition:
-            try:
-                tserial = obj[oid]
-            except KeyError:
-                pass
-            else:
-                batchDelete(tserial, min=serial, max=max_tid,
-                    deleter_callback=self._oidDeleterCallback(oid))
-                if not tserial:
-                    del tserial[oid]
-        def same_partition(key, _):
-            return key % num_partitions == partition
-        batchDelete(obj, same_partition, self._objDeleterCallback,
-            min=oid, excludemin=True, max=max_tid)
-
-    def getTransaction(self, tid, all=False):
-        tid = util.u64(tid)
-        try:
-            result = self._trans[tid]
-        except KeyError:
-            if all:
-                try:
-                    result = self._ttrans[tid]
-                except KeyError:
-                    result = None
-            else:
-                result = None
-        if result is not None:
-            oid_list, user, desc, ext, packed = result
-            result = (list(oid_list), user, desc, ext, packed)
-        return result
-
-    def _getObjectLength(self, oid, value_serial):
-        if value_serial is None:
-            raise CreationUndone
-        checksum, value_serial = self._obj[oid][value_serial]
-        if checksum is None:
-            neo.lib.logging.info("Multiple levels of indirection when " \
-                "searching for object data for oid %d at tid %d. This " \
-                "causes suboptimal performance." % (oid, value_serial))
-            return self._getObjectLength(oid, value_serial)
-        return len(self._data[checksum][1])
-
-    def getObjectHistory(self, oid, offset=0, length=1):
-        # FIXME: This method doesn't take client's current ransaction id as
-        # parameter, which means it can return transactions in the future of
-        # client's transaction.
-        oid = util.u64(oid)
-        p64 = util.p64
-        pack_tid = self._getPackTID()
-        try:
-            tserial = self._obj[oid]
-        except KeyError:
-            result = None
-        else:
-            result = []
-            append = result.append
-            tserial_iter = descItems(tserial)
-            while offset > 0:
-                tserial_iter.next()
-                offset -= 1
-            data = self._data
-            for serial, (checksum, value_serial) in tserial_iter:
-                if length == 0 or serial < pack_tid:
-                    break
-                length -= 1
-                if checksum is None:
-                    try:
-                        data_length = self._getObjectLength(oid, value_serial)
-                    except CreationUndone:
-                        data_length = 0
-                else:
-                    data_length = len(data[checksum][1])
-                append((p64(serial), data_length))
-        if not result:
-            result = None
-        return result
-
-    def getObjectHistoryFrom(self, min_oid, min_serial, max_serial, length,
-            partition):
-        u64 = util.u64
-        p64 = util.p64
-        min_oid = u64(min_oid)
-        min_serial = u64(min_serial)
-        max_serial = u64(max_serial)
-        result = {}
-        num_partitions = self._num_partitions
-        for oid, tserial in safeIter(self._obj.items, min=min_oid):
-            if oid % num_partitions == partition:
-                if length == 0:
-                    break
-                if oid == min_oid:
-                    try:
-                        tid_seq = tserial.keys(min=min_serial,  max=max_serial)
-                    except ValueError:
-                        continue
-                else:
-                    tid_seq = tserial.keys(max=max_serial)
-                if not tid_seq:
-                    continue
-                result[p64(oid)] = tid_list = []
-                append = tid_list.append
-                for tid in tid_seq:
-                    if length == 0:
-                        break
-                    length -= 1
-                    append(p64(tid))
-                else:
-                    continue
-                break
-        return result
-
-    def getTIDList(self, offset, length, partition_list):
-        p64 = util.p64
-        partition_list = frozenset(partition_list)
-        result = []
-        append = result.append
-        trans_iter = descKeys(self._trans)
-        num_partitions = self._num_partitions
-        while offset > 0:
-            tid = trans_iter.next()
-            if tid % num_partitions in partition_list:
-                offset -= 1
-        for tid in trans_iter:
-            if tid % num_partitions in partition_list:
-                if length == 0:
-                    break
-                length -= 1
-                append(p64(tid))
-        return result
-
-    def getReplicationTIDList(self, min_tid, max_tid, length, partition):
-        p64 = util.p64
-        u64 = util.u64
-        result = []
-        append = result.append
-        num_partitions = self._num_partitions
-        for tid in safeIter(self._trans.keys, min=u64(min_tid), max=u64(max_tid)):
-            if tid % num_partitions == partition:
-                if length == 0:
-                    break
-                length -= 1
-                append(p64(tid))
-        return result
-
-    def _updatePackFuture(self, oid, orig_serial, max_serial):
-        # Before deleting this objects revision, see if there is any
-        # transaction referencing its value at max_serial or above.
-        # If there is, copy value to the first future transaction. Any further
-        # reference is just updated to point to the new data location.
-        new_serial = None
-        obj = self._obj
-        for tree in (obj, self._tobj):
-            try:
-                tserial = tree[oid]
-            except KeyError:
-                continue
-            for serial, (checksum, value_serial) in tserial.iteritems(
-                    min=max_serial):
-                if value_serial == orig_serial:
-                    tserial[serial] = checksum, new_serial
-                    if not new_serial:
-                        new_serial = serial
-        return new_serial
-
-    def pack(self, tid, updateObjectDataForPack):
-        p64 = util.p64
-        tid = util.u64(tid)
-        updatePackFuture = self._updatePackFuture
-        self._setPackTID(tid)
-        def obj_callback(oid, tserial):
-            try:
-                max_serial = tserial.maxKey(tid)
-            except ValueError:
-                # No entry before pack TID, nothing to pack on this object.
-                pass
-            else:
-                if tserial[max_serial][0] is None:
-                    # Last version before/at pack TID is a creation undo, drop
-                    # it too.
-                    max_serial += 1
-                def serial_callback(serial, value):
-                    new_serial = updatePackFuture(oid, serial, max_serial)
-                    if new_serial:
-                        new_serial = p64(new_serial)
-                    updateObjectDataForPack(p64(oid), p64(serial),
-                                            new_serial, value[0])
-                batchDelete(tserial, serial_callback,
-                    self._oidDeleterCallback(oid),
-                    max=max_serial, excludemax=True)
-            return not tserial
-        batchDelete(self._obj, obj_callback, self._objDeleterCallback)
-
-    def checkTIDRange(self, min_tid, max_tid, length, partition):
-        if length:
-            tid_list = []
-            num_partitions = self._num_partitions
-            for tid in safeIter(self._trans.keys, min=util.u64(min_tid),
-                                                  max=util.u64(max_tid)):
-                if tid % num_partitions == partition:
-                    tid_list.append(tid)
-                    if len(tid_list) >= length:
-                        break
-            if tid_list:
-                return (len(tid_list),
-                        sha1(','.join(map(str, tid_list))).digest(),
-                        util.p64(tid_list[-1]))
-        return 0, ZERO_HASH, ZERO_TID
-
-    def checkSerialRange(self, min_oid, min_serial, max_tid, length, partition):
-        if length:
-            u64 = util.u64
-            min_oid = u64(min_oid)
-            max_tid = u64(max_tid)
-            oid_list = []
-            serial_list = []
-            num_partitions = self._num_partitions
-            for oid, tserial in safeIter(self._obj.items, min=min_oid):
-                if oid % num_partitions == partition:
-                    try:
-                        if oid == min_oid:
-                            tserial = tserial.keys(min=u64(min_serial),
-                                                   max=max_tid)
-                        else:
-                            tserial = tserial.keys(max=max_tid)
-                    except ValueError:
-                        continue
-                    for serial in tserial:
-                        oid_list.append(oid)
-                        serial_list.append(serial)
-                        if len(oid_list) >= length:
-                            break
-                    else:
-                        continue
-                    break
-            if oid_list:
-                p64 = util.p64
-                return (len(oid_list),
-                        sha1(','.join(map(str, oid_list))).digest(),
-                        p64(oid_list[-1]),
-                        sha1(','.join(map(str, serial_list))).digest(),
-                        p64(serial_list[-1]))
-        return 0, ZERO_HASH, ZERO_OID, ZERO_HASH, ZERO_TID

neo/storage/database/manager.py

@@ -18,6 +18,7 @@
 import neo.lib
 from neo.lib import util
 from neo.lib.exception import DatabaseFailure
+from neo.lib.protocol import ZERO_TID
 
 class CreationUndone(Exception):
     pass
@@ -37,34 +38,6 @@ class DatabaseManager(object):
         """Called during instanciation, to process database parameter."""
         pass
 
-    def isUnderTransaction(self):
-        return self._under_transaction
-
-    def begin(self):
-        """
-            Begin a transaction
-        """
-        if self._under_transaction:
-            raise DatabaseFailure('A transaction has already begun')
-        self._begin()
-        self._under_transaction = True
-
-    def commit(self):
-        """
-            Commit the current transaction
-        """
-        if not self._under_transaction:
-            raise DatabaseFailure('The transaction has not begun')
-        self._commit()
-        self._under_transaction = False
-
-    def rollback(self):
-        """
-            Rollback the current transaction
-        """
-        self._rollback()
-        self._under_transaction = False
-
     def setup(self, reset = 0):
         """Set up a database
 
@@ -79,14 +52,33 @@ class DatabaseManager(object):
         """
         raise NotImplementedError
 
-    def _begin(self):
-        raise NotImplementedError
+    def __enter__(self):
+        """
+            Begin a transaction
+        """
+        if self._under_transaction:
+            raise DatabaseFailure('A transaction has already begun')
+        r = self.begin()
+        self._under_transaction = True
+        return r
 
-    def _commit(self):
-        raise NotImplementedError
+    def __exit__(self, exc_type, exc_value, tb):
+        if not self._under_transaction:
+            raise DatabaseFailure('The transaction has not begun')
+        self._under_transaction = False
+        if exc_type is None:
+            self.commit()
+        else:
+            self.rollback()
 
-    def _rollback(self):
-        raise NotImplementedError
+    def begin(self):
+        pass
+
+    def commit(self):
+        pass
+
+    def rollback(self):
+        pass
 
     def _getPartition(self, oid_or_tid):
         return oid_or_tid % self.getNumPartitions()
@@ -104,13 +96,8 @@ class DatabaseManager(object):
         if self._under_transaction:
             self._setConfiguration(key, value)
         else:
-            self.begin()
-            try:
+            with self:
                 self._setConfiguration(key, value)
-            except:
-                self.rollback()
-                raise
-            self.commit()
 
     def _setConfiguration(self, key, value):
         raise NotImplementedError
@@ -171,7 +158,9 @@ class DatabaseManager(object):
         """
             Load a Partition Table ID from a database.
         """
-        return long(self.getConfiguration('ptid'))
+        ptid = self.getConfiguration('ptid')
+        if ptid is not None:
+            return long(ptid)
 
     def setPTID(self, ptid):
         """
@@ -194,18 +183,31 @@ class DatabaseManager(object):
         """
         self.setConfiguration('loid', util.dump(loid))
 
+    def getBackupTID(self):
+        return util.bin(self.getConfiguration('backup_tid'))
+
+    def setBackupTID(self, backup_tid):
+        return self.setConfiguration('backup_tid', util.dump(backup_tid))
+
     def getPartitionTable(self):
         """Return a whole partition table as a tuple of rows. Each row
         is again a tuple of an offset (row ID), an UUID of a storage
         node, and a cell state."""
         raise NotImplementedError
 
-    def getLastTID(self, all = True):
-        """Return the last TID in a database. If all is true,
-        unfinished transactions must be taken account into. If there
-        is no TID in the database, return None."""
+    def _getLastTIDs(self, all=True):
         raise NotImplementedError
 
+    def getLastTIDs(self, all=True):
+        trans, obj = self._getLastTIDs()
+        if trans:
+            tid = max(trans.itervalues())
+            if obj:
+                tid = max(tid, max(obj.itervalues()))
+        else:
+            tid = max(obj.itervalues()) if obj else None
+        return tid, trans, obj
+
     def getUnfinishedTIDList(self):
         """Return a list of unfinished transaction's IDs."""
         raise NotImplementedError
@@ -352,13 +354,8 @@ class DatabaseManager(object):
             else:
                 del refcount[data_id]
         if prune:
-            self.begin()
-            try:
+            with self:
                 self._pruneData(data_id_list)
-            except:
-                self.rollback()
-                raise
-            self.commit()
 
     __getDataTID = set()
     def _getDataTID(self, oid, tid=None, before_tid=None):
@@ -466,23 +463,24 @@ class DatabaseManager(object):
         an oid list"""
         raise NotImplementedError
 
-    def deleteTransactionsAbove(self, partition, tid, max_tid):
-        """Delete all transactions above given TID (inclued) in given
-        partition, but never above max_tid (in case transactions are committed
-        during replication)."""
-        raise NotImplementedError
-
     def deleteObject(self, oid, serial=None):
         """Delete given object. If serial is given, only delete that serial for
         given oid."""
         raise NotImplementedError
 
-    def deleteObjectsAbove(self, partition, oid, serial, max_tid):
-        """Delete all objects above given OID and serial (inclued) in given
-        partition, but never above max_tid (in case objects are stored during
-        replication)"""
+    def _deleteRange(self, partition, min_tid=None, max_tid=None):
+        """Delete all objects and transactions between given min_tid (excluded)
+        and max_tid (included)"""
         raise NotImplementedError
 
+    def truncate(self, tid):
+        assert tid not in (None, ZERO_TID), tid
+        with self:
+            assert self.getBackupTID()
+            self.setBackupTID(tid)
+            for partition in xrange(self.getNumPartitions()):
+                self._deleteRange(partition, tid)
+
     def getTransaction(self, tid, all = False):
         """Return a tuple of the list of OIDs, user information,
         a description, and extension information, for a given transaction
@@ -498,10 +496,10 @@ class DatabaseManager(object):
         If there is no such object ID in a database, return None."""
         raise NotImplementedError
 
-    def getObjectHistoryFrom(self, oid, min_serial, max_serial, length,
-            partition):
-        """Return a dict of length serials grouped by oid at (or above)
-        min_oid and min_serial and below max_serial, for given partition,
+    def getReplicationObjectList(self, min_tid, max_tid, length, partition,
+            min_oid):
+        """Return a dict of length oids grouped by serial at (or above)
+        min_tid and min_oid and below max_tid, for given partition,
         sorted in ascending order."""
         raise NotImplementedError
 

neo/storage/database/mysqldb.py

@@ -27,14 +27,12 @@ import re
 import string
 import time
 
-from . import DatabaseManager
+from . import DatabaseManager, LOG_QUERIES
 from .manager import CreationUndone
 from neo.lib.exception import DatabaseFailure
 from neo.lib.protocol import CellStates, ZERO_OID, ZERO_TID, ZERO_HASH
 from neo.lib import util
 
-LOG_QUERIES = False
-
 def splitOIDField(tid, oids):
     if (len(oids) % 8) != 0 or len(oids) == 0:
         raise DatabaseFailure('invalid oids length for tid %d: %d' % (tid,
@@ -99,18 +97,22 @@ class MySQLDatabaseManager(DatabaseManager):
         self.conn.query("SET SESSION group_concat_max_len = -1")
         self.conn.set_sql_mode("TRADITIONAL,NO_ENGINE_SUBSTITUTION")
 
-    def _begin(self):
-        self.query("""BEGIN""")
+    def begin(self):
+        q = self.query
+        q("BEGIN")
+        return q
 
-    def _commit(self):
     if LOG_QUERIES:
+        def commit(self):
             neo.lib.logging.debug('committing...')
             self.conn.commit()
 
-    def _rollback(self):
-        if LOG_QUERIES:
+        def rollback(self):
             neo.lib.logging.debug('aborting...')
             self.conn.rollback()
+    else:
+        commit = property(lambda self: self.conn.commit)
+        rollback = property(lambda self: self.conn.rollback)
 
     def query(self, query):
         """Query data from a database."""
@@ -194,7 +196,8 @@ class MySQLDatabaseManager(DatabaseManager):
                  serial BIGINT UNSIGNED NOT NULL,
                  data_id BIGINT UNSIGNED NULL,
                  value_serial BIGINT UNSIGNED NULL,
-                 PRIMARY KEY (partition, oid, serial),
+                 PRIMARY KEY (partition, serial, oid),
+                 KEY (partition, oid, serial),
                  KEY (data_id)
              ) ENGINE = InnoDB""" + p)
 
@@ -233,15 +236,15 @@ class MySQLDatabaseManager(DatabaseManager):
             " FROM tobj WHERE data_id IS NOT NULL GROUP BY data_id") or ())
 
     def getConfiguration(self, key):
-        if key in self._config:
+        try:
             return self._config[key]
-        q = self.query
-        e = self.escape
-        sql_key = e(str(key))
+        except KeyError:
+            sql_key = self.escape(str(key))
             try:
-            r = q("SELECT value FROM config WHERE name = '%s'" % sql_key)[0][0]
+                r = self.query("SELECT value FROM config WHERE name = '%s'"
+                               % sql_key)[0][0]
             except IndexError:
-            raise KeyError, key
+                r = None
             self._config[key] = r
             return r
 
@@ -251,20 +254,19 @@ class MySQLDatabaseManager(DatabaseManager):
         self._config[key] = value
         key = e(str(key))
         if value is None:
-            value = 'NULL'
+            q("DELETE FROM config WHERE name = '%s'" % key)
         else:
-            value = "'%s'" % (e(str(value)), )
-        q("""REPLACE INTO config VALUES ('%s', %s)""" % (key, value))
+            value = e(str(value))
+            q("REPLACE INTO config VALUES ('%s', '%s')" % (key, value))
 
     def _setPackTID(self, tid):
         self._setConfiguration('_pack_tid', tid)
 
     def _getPackTID(self):
         try:
-            result = int(self.getConfiguration('_pack_tid'))
-        except KeyError:
-            result = -1
-        return result
+            return int(self.getConfiguration('_pack_tid'))
+        except TypeError:
+            return -1
 
     def getPartitionTable(self):
         q = self.query
@@ -275,58 +277,42 @@ class MySQLDatabaseManager(DatabaseManager):
             pt.append((offset, uuid, state))
         return pt
 
-    def getLastTID(self, all = True):
-        # XXX this does not consider serials in obj.
-        # I am not sure if this is really harmful. For safety,
-        # check for tobj only at the moment. The reason why obj is
-        # not tested is that it is too slow to get the max serial
-        # from obj when it has a huge number of objects, because
-        # serial is the second part of the primary key, so the index
-        # is not used in this case. If doing it, it is better to
-        # make another index for serial, but I doubt the cost increase
-        # is worth.
-        q = self.query
-        self.begin()
-        ltid = q("SELECT MAX(value) FROM (SELECT MAX(tid) AS value FROM trans "
-                    "GROUP BY partition) AS foo")[0][0]
+    def _getLastTIDs(self, all=True):
+        p64 = util.p64
+        with self as q:
+            trans = dict((partition, p64(tid))
+                for partition, tid in q("SELECT partition, MAX(tid)"
+                                        " FROM trans GROUP BY partition"))
+            obj = dict((partition, p64(tid))
+                for partition, tid in q("SELECT partition, MAX(serial)"
+                                        " FROM obj GROUP BY partition"))
             if all:
-            tmp_ltid = q("""SELECT MAX(tid) FROM ttrans""")[0][0]
-            if ltid is None or (tmp_ltid is not None and ltid < tmp_ltid):
-                ltid = tmp_ltid
-            tmp_serial = q("""SELECT MAX(serial) FROM tobj""")[0][0]
-            if ltid is None or (tmp_serial is not None and ltid < tmp_serial):
-                ltid = tmp_serial
-        self.commit()
-        if ltid is not None:
-            ltid = util.p64(ltid)
-        return ltid
+                tid = q("SELECT MAX(tid) FROM ttrans")[0][0]
+                if tid is not None:
+                    trans[None] = p64(tid)
+                tid = q("SELECT MAX(serial) FROM tobj")[0][0]
+                if tid is not None:
+                    obj[None] = p64(tid)
+        return trans, obj
 
     def getUnfinishedTIDList(self):
-        q = self.query
         tid_set = set()
-        self.begin()
+        with self as q:
             r = q("""SELECT tid FROM ttrans""")
             tid_set.update((util.p64(t[0]) for t in r))
             r = q("""SELECT serial FROM tobj""")
-        self.commit()
         tid_set.update((util.p64(t[0]) for t in r))
         return list(tid_set)
 
     def objectPresent(self, oid, tid, all = True):
-        q = self.query
         oid = util.u64(oid)
         tid = util.u64(tid)
         partition = self._getPartition(oid)
-        self.begin()
-        r = q("SELECT oid FROM obj WHERE partition=%d AND oid=%d AND "
-              "serial=%d" % (partition, oid, tid))
-        if not r and all:
-            r = q("SELECT oid FROM tobj WHERE serial=%d AND oid=%d"
+        with self as q:
+            return q("SELECT oid FROM obj WHERE partition=%d AND oid=%d AND "
+                     "serial=%d" % (partition, oid, tid)) or all and \
+                   q("SELECT oid FROM tobj WHERE serial=%d AND oid=%d"
                      % (tid, oid))
-        self.commit()
-        if r:
-            return True
-        return False
 
     def _getObject(self, oid, tid=None, before_tid=None):
         q = self.query
@@ -357,11 +343,9 @@ class MySQLDatabaseManager(DatabaseManager):
         return serial, next_serial, compression, checksum, data, value_serial
 
     def doSetPartitionTable(self, ptid, cell_list, reset):
-        q = self.query
         e = self.escape
         offset_list = []
-        self.begin()
-        try:
+        with self as q:
             if reset:
                 q("""TRUNCATE pt""")
             for offset, uuid, state in cell_list:
@@ -377,10 +361,6 @@ class MySQLDatabaseManager(DatabaseManager):
                             ON DUPLICATE KEY UPDATE state = %d""" \
                                     % (offset, uuid, state, state))
             self.setPTID(ptid)
-        except:
-            self.rollback()
-            raise
-        self.commit()
         if self._use_partition:
             for offset in offset_list:
                 add = """ALTER TABLE %%s ADD PARTITION (
@@ -399,9 +379,7 @@ class MySQLDatabaseManager(DatabaseManager):
         self.doSetPartitionTable(ptid, cell_list, True)
 
     def dropPartitions(self, offset_list):
-        q = self.query
-        self.begin()
-        try:
+        with self as q:
             # XXX: these queries are inefficient (execution time increase with
             # row count, although we use indexes) when there are rows to
             # delete. It should be done as an idle task, by chunks.
@@ -413,10 +391,6 @@ class MySQLDatabaseManager(DatabaseManager):
                     q("DELETE FROM obj" + where)
                     q("DELETE FROM trans" + where)
                 self._pruneData(data_id_list)
-        except:
-            self.rollback()
-            raise
-        self.commit()
         if self._use_partition:
             drop = "ALTER TABLE %s DROP PARTITION" + \
                 ','.join(' p%u' % i for i in offset_list)
@@ -428,20 +402,13 @@ class MySQLDatabaseManager(DatabaseManager):
                         raise
 
     def dropUnfinishedData(self):
-        q = self.query
-        self.begin()
-        try:
+        with self as q:
             data_id_list = [x for x, in q("SELECT data_id FROM tobj") if x]
             q("""TRUNCATE tobj""")
             q("""TRUNCATE ttrans""")
-        except:
-            self.rollback()
-            raise
-        self.commit()
         self.unlockData(data_id_list, True)
 
     def storeTransaction(self, tid, object_list, transaction, temporary = True):
-        q = self.query
         e = self.escape
         u64 = util.u64
         tid = u64(tid)
@@ -453,8 +420,7 @@ class MySQLDatabaseManager(DatabaseManager):
             obj_table = 'obj'
             trans_table = 'trans'
 
-        self.begin()
-        try:
+        with self as q:
             for oid, data_id, value_serial in object_list:
                 oid = u64(oid)
                 partition = self._getPartition(oid)
@@ -481,10 +447,6 @@ class MySQLDatabaseManager(DatabaseManager):
                 q("REPLACE INTO %s VALUES (%d, %d, %i, '%s', '%s', '%s', '%s')"
                     % (trans_table, partition, tid, packed, oids, user, desc,
                         ext))
-        except:
-            self.rollback()
-            raise
-        self.commit()
 
     def _pruneData(self, data_id_list):
         data_id_list = set(data_id_list).difference(self._uncommitted_data)
@@ -497,24 +459,19 @@ class MySQLDatabaseManager(DatabaseManager):
     def _storeData(self, checksum, data, compression):
         e = self.escape
         checksum = e(checksum)
-        self.begin()
-        try:
+        with self as q:
             try:
-                self.query("INSERT INTO data VALUES (NULL, '%s', %d, '%s')" %
+                q("INSERT INTO data VALUES (NULL, '%s', %d, '%s')" %
                     (checksum, compression,  e(data)))
             except IntegrityError, (code, _):
                 if code != DUP_ENTRY:
                     raise
-                (r, c, d), = self.query("SELECT id, compression, value"
+                (r, c, d), = q("SELECT id, compression, value"
                                " FROM data WHERE hash='%s'" % checksum)
                 if c != compression or d != data:
                     raise
             else:
                 r = self.conn.insert_id()
-        except:
-            self.rollback()
-            raise
-        self.commit()
         return r
 
     def _getDataTID(self, oid, tid=None, before_tid=None):
@@ -540,27 +497,20 @@ class MySQLDatabaseManager(DatabaseManager):
     def finishTransaction(self, tid):
         q = self.query
         tid = util.u64(tid)
-        self.begin()
-        try:
+        with self as q:
             sql = " FROM tobj WHERE serial=%d" % tid
             data_id_list = [x for x, in q("SELECT data_id" + sql) if x]
             q("INSERT INTO obj SELECT *" + sql)
             q("DELETE FROM tobj WHERE serial=%d" % tid)
             q("INSERT INTO trans SELECT * FROM ttrans WHERE tid=%d" % tid)
             q("DELETE FROM ttrans WHERE tid=%d" % tid)
-        except:
-            self.rollback()
-            raise
-        self.commit()
         self.unlockData(data_id_list)
 
     def deleteTransaction(self, tid, oid_list=()):
-        q = self.query
         u64 = util.u64
         tid = u64(tid)
         getPartition = self._getPartition
-        self.begin()
-        try:
+        with self as q:
             sql = " FROM tobj WHERE serial=%d" % tid
             data_id_list = [x for x, in q("SELECT data_id" + sql) if x]
             self.unlockData(data_id_list)
@@ -578,77 +528,45 @@ class MySQLDatabaseManager(DatabaseManager):
                 q("DELETE" + sql)
             data_id_set.discard(None)
             self._pruneData(data_id_set)
-        except:
-            self.rollback()
-            raise
-        self.commit()
-
-    def deleteTransactionsAbove(self, partition, tid, max_tid):
-        self.begin()
-        try:
-            self.query('DELETE FROM trans WHERE partition=%(partition)d AND '
-              '%(tid)d <= tid AND tid <= %(max_tid)d' % {
-                'partition': partition,
-                'tid': util.u64(tid),
-                'max_tid': util.u64(max_tid),
-            })
-        except:
-            self.rollback()
-            raise
-        self.commit()
 
     def deleteObject(self, oid, serial=None):
-        q = self.query
         u64 = util.u64
         oid = u64(oid)
         sql = " FROM obj WHERE partition=%d AND oid=%d" \
             % (self._getPartition(oid), oid)
         if serial:
             sql += ' AND serial=%d' % u64(serial)
-        self.begin()
-        try:
+        with self as q:
             data_id_list = [x for x, in q("SELECT DISTINCT data_id" + sql) if x]
             q("DELETE" + sql)
             self._pruneData(data_id_list)
-        except:
-            self.rollback()
-            raise
-        self.commit()
 
-    def deleteObjectsAbove(self, partition, oid, serial, max_tid):
+    def _deleteRange(self, partition, min_tid=None, max_tid=None):
+        sql = " WHERE partition=%d" % partition
+        if min_tid:
+            sql += " AND %d < tid" % util.u64(min_tid)
+        if max_tid:
+            sql += " AND tid <= %d" % util.u64(max_tid)
         q = self.query
-        u64 = util.u64
-        oid = u64(oid)
-        sql = (" FROM obj WHERE partition=%d AND serial <= %d"
-            " AND (oid > %d OR (oid = %d AND serial >= %d))" %
-            (partition, u64(max_tid), oid, oid, u64(serial)))
-        self.begin()
-        try:
+        q("DELETE FROM trans" + sql)
+        sql = " FROM obj" + sql.replace('tid', 'serial')
         data_id_list = [x for x, in q("SELECT DISTINCT data_id" + sql) if x]
         q("DELETE" + sql)
         self._pruneData(data_id_list)
-        except:
-            self.rollback()
-            raise
-        self.commit()
 
     def getTransaction(self, tid, all = False):
-        q = self.query
         tid = util.u64(tid)
-        self.begin()
-        r = q("""SELECT oids, user, description, ext, packed FROM trans
-                    WHERE partition = %d AND tid = %d""" \
+        with self as q:
+            r = q("SELECT oids, user, description, ext, packed FROM trans"
+                  " WHERE partition = %d AND tid = %d"
                   % (self._getPartition(tid), tid))
             if not r and all:
-            r = q("""SELECT oids, user, description, ext, packed FROM ttrans
-                        WHERE tid = %d""" \
-                    % tid)
-        self.commit()
+                r = q("SELECT oids, user, description, ext, packed FROM ttrans"
+                      " WHERE tid = %d" % tid)
         if r:
             oids, user, desc, ext, packed = r[0]
             oid_list = splitOIDField(tid, oids)
             return oid_list, user, desc, ext, bool(packed)
-        return None
 
     def _getObjectLength(self, oid, value_serial):
         if value_serial is None:
@@ -690,34 +608,17 @@ class MySQLDatabaseManager(DatabaseManager):
             return result
         return None
 
-    def getObjectHistoryFrom(self, min_oid, min_serial, max_serial, length,
-            partition):
-        q = self.query
+    def getReplicationObjectList(self, min_tid, max_tid, length, partition,
+            min_oid):
         u64 = util.u64
         p64 = util.p64
-        min_oid = u64(min_oid)
-        min_serial = u64(min_serial)
-        max_serial = u64(max_serial)
-        r = q('SELECT oid, serial FROM obj '
-                'WHERE partition = %(partition)s '
-                'AND serial <= %(max_serial)d '
-                'AND ((oid = %(min_oid)d AND serial >= %(min_serial)d) '
-                'OR oid > %(min_oid)d) '
-                'ORDER BY oid ASC, serial ASC LIMIT %(length)d' % {
-            'min_oid': min_oid,
-            'min_serial': min_serial,
-            'max_serial': max_serial,
-            'length': length,
-            'partition': partition,
-        })
-        result = {}
-        for oid, serial in r:
-            try:
-                serial_list = result[oid]
-            except KeyError:
-                serial_list = result[oid] = []
-            serial_list.append(p64(serial))
-        return dict((p64(x), y) for x, y in result.iteritems())
+        min_tid = u64(min_tid)
+        r = self.query('SELECT serial, oid FROM obj'
+                       ' WHERE partition = %d AND serial <= %d'
+                       ' AND (serial = %d AND %d <= oid OR %d < serial)'
+                       ' ORDER BY serial ASC, oid ASC LIMIT %d' % (
+            partition, u64(max_tid), min_tid, u64(min_oid), min_tid, length))
+        return [(p64(serial), p64(oid)) for serial, oid in r]
 
     def getTIDList(self, offset, length, partition_list):
         q = self.query
@@ -727,12 +628,11 @@ class MySQLDatabaseManager(DatabaseManager):
         return [util.p64(t[0]) for t in r]
 
     def getReplicationTIDList(self, min_tid, max_tid, length, partition):
-        q = self.query
         u64 = util.u64
         p64 = util.p64
         min_tid = u64(min_tid)
         max_tid = u64(max_tid)
-        r = q("""SELECT tid FROM trans
+        r = self.query("""SELECT tid FROM trans
                     WHERE partition = %(partition)d
                     AND tid >= %(min_tid)d AND tid <= %(max_tid)d
                     ORDER BY tid ASC LIMIT %(length)d""" % {
@@ -772,13 +672,11 @@ class MySQLDatabaseManager(DatabaseManager):
 
     def pack(self, tid, updateObjectDataForPack):
         # TODO: unit test (along with updatePackFuture)
-        q = self.query
         p64 = util.p64
         tid = util.u64(tid)
         updatePackFuture = self._updatePackFuture
         getPartition = self._getPartition
-        self.begin()
-        try:
+        with self as q:
             self._setPackTID(tid)
             for count, oid, max_serial in q('SELECT COUNT(*) - 1, oid, '
                     'MAX(serial) FROM obj WHERE serial <= %d GROUP BY oid'
@@ -804,10 +702,6 @@ class MySQLDatabaseManager(DatabaseManager):
                 q('DELETE' + sql)
                 data_id_set.discard(None)
                 self._pruneData(data_id_set)
-        except:
-            self.rollback()
-            raise
-        self.commit()
 
     def checkTIDRange(self, min_tid, max_tid, length, partition):
         count, tid_checksum, max_tid = self.query(
@@ -816,11 +710,11 @@ class MySQLDatabaseManager(DatabaseManager):
                      WHERE partition = %(partition)s
                        AND tid >= %(min_tid)d
                        AND tid <= %(max_tid)d
-                     ORDER BY tid ASC LIMIT %(length)d) AS t""" % {
+                     ORDER BY tid ASC %(limit)s) AS t""" % {
             'partition': partition,
             'min_tid': util.u64(min_tid),
             'max_tid': util.u64(max_tid),
-            'length': length,
+            'limit': '' if length is None else 'LIMIT %(length)d' % length,
         })[0]
         if count:
             return count, a2b_hex(tid_checksum), util.p64(max_tid)
@@ -839,11 +733,11 @@ class MySQLDatabaseManager(DatabaseManager):
                  AND serial <= %(max_tid)d
                  AND (oid > %(min_oid)d OR
                       oid = %(min_oid)d AND serial >= %(min_serial)d)
-               ORDER BY oid ASC, serial ASC LIMIT %(length)d""" % {
+               ORDER BY oid ASC, serial ASC %(limit)s""" % {
             'min_oid': u64(min_oid),
             'min_serial': u64(min_serial),
             'max_tid': u64(max_tid),
-            'length': length,
+            'limit': '' if length is None else 'LIMIT %(length)d' % length,
             'partition': partition,
         })
         if r:

neo/storage/database/sqlite.py

+#
+# Copyright (C) 2012  Nexedi SA
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+import sqlite3
+import neo.lib
+from array import array
+from hashlib import sha1
+import re
+import string
+
+from . import DatabaseManager, LOG_QUERIES
+from .manager import CreationUndone
+from neo.lib.exception import DatabaseFailure
+from neo.lib.protocol import CellStates, ZERO_OID, ZERO_TID, ZERO_HASH
+from neo.lib import util
+
+def splitOIDField(tid, oids):
+    if (len(oids) % 8) != 0 or len(oids) == 0:
+        raise DatabaseFailure('invalid oids length for tid %d: %d' % (tid,
+            len(oids)))
+    oid_list = []
+    append = oid_list.append
+    for i in xrange(0, len(oids), 8):
+        append(oids[i:i+8])
+    return oid_list
+
+class SQLiteDatabaseManager(DatabaseManager):
+    """This class manages a database on SQLite.
+
+    CAUTION: Make sure we never use statement journal files, as explained at
+             http://www.sqlite.org/tempfiles.html for more information.
+             In other words, temporary files (by default in /var/tmp !) must
+             never be used for small requests.
+    """
+
+    def __init__(self, *args, **kw):
+        super(SQLiteDatabaseManager, self).__init__(*args, **kw)
+        self._config = {}
+        self._connect()
+
+    def _parse(self, database):
+        self.db = database
+
+    def close(self):
+        self.conn.close()
+
+    def _connect(self):
+        neo.lib.logging.info('connecting to SQLite database %r', self.db)
+        self.conn = sqlite3.connect(self.db, isolation_level=None,
+            check_same_thread=False)
+
+    def begin(self):
+        q = self.query
+        q("BEGIN IMMEDIATE")
+        return q
+
+    if LOG_QUERIES:
+        def commit(self):
+            neo.lib.logging.debug('committing...')
+            self.conn.commit()
+
+        def rollback(self):
+            neo.lib.logging.debug('aborting...')
+            self.conn.rollback()
+
+        def query(self, query):
+            printable_char_list = []
+            for c in query.split('\n', 1)[0][:70]:
+                if c not in string.printable or c in '\t\x0b\x0c\r':
+                    c = '\\x%02x' % ord(c)
+                printable_char_list.append(c)
+            neo.lib.logging.debug('querying %s...',
+                ''.join(printable_char_list))
+            return self.conn.execute(query)
+    else:
+        commit = property(lambda self: self.conn.commit)
+        rollback = property(lambda self: self.conn.rollback)
+        query = property(lambda self: self.conn.execute)
+
+    def setup(self, reset = 0):
+        self._config.clear()
+        q = self.query
+
+        if reset:
+            for t in 'config', 'pt', 'trans', 'obj', 'data', 'ttrans', 'tobj':
+                q('DROP TABLE IF EXISTS ' + t)
+
+        # The table "config" stores configuration parameters which affect the
+        # persistent data.
+        q("""CREATE TABLE IF NOT EXISTS config (
+                 name TEXT NOT NULL PRIMARY KEY,
+                 value BLOB)
+          """)
+
+        # The table "pt" stores a partition table.
+        q("""CREATE TABLE IF NOT EXISTS pt (
+                 rid INTEGER NOT NULL,
+                 uuid BLOB NOT NULL,
+                 state INTEGER NOT NULL,
+                 PRIMARY KEY (rid, uuid))
+          """)
+
+        # The table "trans" stores information on committed transactions.
+        q("""CREATE TABLE IF NOT EXISTS trans (
+                 partition INTEGER NOT NULL,
+                 tid INTEGER NOT NULL,
+                 packed BOOLEAN NOT NULL,
+                 oids BLOB NOT NULL,
+                 user BLOB NOT NULL,
+                 description BLOB NOT NULL,
+                 ext BLOB NOT NULL,
+                 PRIMARY KEY (partition, tid))
+          """)
+
+        # The table "obj" stores committed object metadata.
+        q("""CREATE TABLE IF NOT EXISTS obj (
+                 partition INTEGER NOT NULL,
+                 oid INTEGER NOT NULL,
+                 serial INTEGER NOT NULL,
+                 data_id INTEGER,
+                 value_serial INTEGER,
+                 PRIMARY KEY (partition, serial, oid))
+          """)
+        q("""CREATE INDEX IF NOT EXISTS _obj_i1 ON
+                 obj(partition, oid, serial)
+          """)
+        q("""CREATE INDEX IF NOT EXISTS _obj_i2 ON
+                 obj(data_id)
+          """)
+
+        # The table "data" stores object data.
+        q("""CREATE TABLE IF NOT EXISTS data (
+                 id INTEGER PRIMARY KEY AUTOINCREMENT,
+                 hash BLOB NOT NULL UNIQUE,
+                 compression INTEGER,
+                 value BLOB)
+          """)
+
+        # The table "ttrans" stores information on uncommitted transactions.
+        q("""CREATE TABLE IF NOT EXISTS ttrans (
+                 partition INTEGER NOT NULL,
+                 tid INTEGER NOT NULL,
+                 packed BOOLEAN NOT NULL,
+                 oids BLOB NOT NULL,
+                 user BLOB NOT NULL,
+                 description BLOB NOT NULL,
+                 ext BLOB NOT NULL)
+          """)
+
+        # The table "tobj" stores uncommitted object metadata.
+        q("""CREATE TABLE IF NOT EXISTS tobj (
+                 partition INTEGER NOT NULL,
+                 oid INTEGER NOT NULL,
+                 serial INTEGER NOT NULL,
+                 data_id INTEGER,
+                 value_serial INTEGER,
+                 PRIMARY KEY (serial, oid))
+          """)
+
+        self._uncommitted_data = dict(q("SELECT data_id, count(*)"
+            " FROM tobj WHERE data_id IS NOT NULL GROUP BY data_id"))
+
+    def getConfiguration(self, key):
+        try:
+            return self._config[key]
+        except KeyError:
+            try:
+                r = str(self.query("SELECT value FROM config WHERE name=?",
+                                   (key,)).fetchone()[0])
+            except TypeError:
+                r = None
+            self._config[key] = r
+            return r
+
+    def _setConfiguration(self, key, value):
+        q = self.query
+        self._config[key] = value
+        if value is None:
+            q("DELETE FROM config WHERE name=?", (key,))
+        else:
+            q("REPLACE INTO config VALUES (?,?)", (key, buffer(str(value))))
+
+    def _setPackTID(self, tid):
+        self._setConfiguration('_pack_tid', tid)
+
+    def _getPackTID(self):
+        try:
+            return int(self.getConfiguration('_pack_tid'))
+        except TypeError:
+            return -1
+
+    def getPartitionTable(self):
+        return [(offset, util.bin(uuid), state)
+            for offset, uuid, state in self.query(
+                "SELECT rid, uuid, state FROM pt")]
+
+    def _getLastTIDs(self, all=True):
+        p64 = util.p64
+        with self as q:
+            trans = dict((partition, p64(tid))
+                for partition, tid in q("SELECT partition, MAX(tid)"
+                                        " FROM trans GROUP BY partition"))
+            obj = dict((partition, p64(tid))
+                for partition, tid in q("SELECT partition, MAX(serial)"
+                                        " FROM obj GROUP BY partition"))
+            if all:
+                tid = q("SELECT MAX(tid) FROM ttrans").fetchone()[0]
+                if tid is not None:
+                    trans[None] = p64(tid)
+                tid = q("SELECT MAX(serial) FROM tobj").fetchone()[0]
+                if tid is not None:
+                    obj[None] = p64(tid)
+        return trans, obj
+
+    def getUnfinishedTIDList(self):
+        p64 = util.p64
+        tid_set = set()
+        with self as q:
+            tid_set.update((p64(t[0]) for t in q("SELECT tid FROM ttrans")))
+            tid_set.update((p64(t[0]) for t in q("SELECT serial FROM tobj")))
+        return list(tid_set)
+
+    def objectPresent(self, oid, tid, all=True):
+        oid = util.u64(oid)
+        tid = util.u64(tid)
+        with self as q:
+            r = q("SELECT 1 FROM obj WHERE partition=? AND oid=? AND serial=?",
+                  (self._getPartition(oid), oid, tid)).fetchone()
+            if not r and all:
+                r = q("SELECT 1 FROM tobj WHERE serial=? AND oid=?",
+                      (tid, oid)).fetchone()
+        return bool(r)
+
+    def _getObject(self, oid, tid=None, before_tid=None):
+        q = self.query
+        partition = self._getPartition(oid)
+        sql = ('SELECT serial, compression, data.hash, value, value_serial'
+               ' FROM obj LEFT JOIN data ON obj.data_id = data.id'
+               ' WHERE partition=? AND oid=?')
+        if tid is not None:
+            r = q(sql + ' AND serial=?', (partition, oid, tid))
+        elif before_tid is not None:
+            r = q(sql + ' AND serial<? ORDER BY serial DESC LIMIT 1',
+                  (partition, oid, before_tid))
+        else:
+            r = q(sql + ' ORDER BY serial DESC LIMIT 1', (partition, oid))
+        try:
+            serial, compression, checksum, data, value_serial = r.fetchone()
+        except TypeError:
+            return None
+        r = q("""SELECT serial FROM obj
+                 WHERE partition=? AND oid=? AND serial>?
+                 ORDER BY serial LIMIT 1""",
+              (partition, oid, serial)).fetchone()
+        if checksum:
+            checksum = str(checksum)
+            data = str(data)
+        return serial, r and r[0], compression, checksum, data, value_serial
+
+    def doSetPartitionTable(self, ptid, cell_list, reset):
+        with self as q:
+            if reset:
+                q("DELETE FROM pt")
+            for offset, uuid, state in cell_list:
+                uuid = buffer(util.dump(uuid))
+                # TODO: this logic should move out of database manager
+                # add 'dropCells(cell_list)' to API and use one query
+                # WKRD: Why does SQLite need a statement journal file
+                #       whereas we try to replace only 1 value ?
+                #       We don't want to remove the 'NOT NULL' constraint
+                #       so we must simulate a "REPLACE OR FAIL".
+                q("DELETE FROM pt WHERE rid=? AND uuid=?", (offset, uuid))
+                if state != CellStates.DISCARDED:
+                    q("INSERT OR FAIL INTO pt VALUES (?,?,?)",
+                      (offset, uuid, int(state)))
+            self.setPTID(ptid)
+
+    def changePartitionTable(self, ptid, cell_list):
+        self.doSetPartitionTable(ptid, cell_list, False)
+
+    def setPartitionTable(self, ptid, cell_list):
+        self.doSetPartitionTable(ptid, cell_list, True)
+
+    def dropPartitions(self, offset_list):
+        where = " WHERE partition=?"
+        with self as q:
+            for partition in offset_list:
+                data_id_list = [x for x, in
+                    q("SELECT DISTINCT data_id FROM obj" + where,
+                        (partition,)) if x]
+                q("DELETE FROM obj" + where, (partition,))
+                q("DELETE FROM trans" + where, (partition,))
+                self._pruneData(data_id_list)
+
+    def dropUnfinishedData(self):
+        with self as q:
+            data_id_list = [x for x, in q("SELECT data_id FROM tobj") if x]
+            q("DELETE FROM tobj")
+            q("DELETE FROM ttrans")
+        self.unlockData(data_id_list, True)
+
+    def storeTransaction(self, tid, object_list, transaction, temporary=True):
+        u64 = util.u64
+        tid = u64(tid)
+        T = 't' if temporary else ''
+        obj_sql = "INSERT OR FAIL INTO %sobj VALUES (?,?,?,?,?)" % T
+        with self as q:
+            for oid, data_id, value_serial in object_list:
+                oid = u64(oid)
+                partition = self._getPartition(oid)
+                if value_serial:
+                    value_serial = u64(value_serial)
+                    (data_id,), = q("SELECT data_id FROM obj"
+                        " WHERE partition=? AND oid=? AND serial=?",
+                        (partition, oid, value_serial))
+                    if temporary:
+                        self.storeData(data_id)
+                try:
+                    q(obj_sql, (partition, oid, tid, data_id, value_serial))
+                except sqlite3.IntegrityError:
+                    # This may happen if a previous replication of 'obj' was
+                    # interrupted.
+                    if not T:
+                        r, = q("SELECT data_id, value_serial FROM obj"
+                               " WHERE partition=? AND oid=? AND serial=?",
+                               (partition, oid, tid))
+                        if r == (data_id, value_serial):
+                            continue
+                    raise
+
+            if transaction is not None:
+                oid_list, user, desc, ext, packed = transaction
+                partition = self._getPartition(tid)
+                assert packed in (0, 1)
+                q("INSERT OR FAIL INTO %strans VALUES (?,?,?,?,?,?,?)" % T,
+                    (partition, tid, packed, buffer(''.join(oid_list)),
+                     buffer(user), buffer(desc), buffer(ext)))
+
+    def _pruneData(self, data_id_list):
+        data_id_list = set(data_id_list).difference(self._uncommitted_data)
+        if data_id_list:
+            q = self.query
+            data_id_list.difference_update(x for x, in q(
+                "SELECT DISTINCT data_id FROM obj WHERE data_id IN (%s)"
+                % ",".join(map(str, data_id_list))))
+            q("DELETE FROM data WHERE id IN (%s)"
+              % ",".join(map(str, data_id_list)))
+
+    def _storeData(self, checksum, data, compression):
+        H = buffer(checksum)
+        with self as q:
+            try:
+                return q("INSERT INTO data VALUES (NULL,?,?,?)",
+                    (H, compression,  buffer(data))).lastrowid
+            except sqlite3.IntegrityError, e:
+                if e.args[0] == 'column hash is not unique':
+                    (r, c, d), = q("SELECT id, compression, value"
+                                  " FROM data WHERE hash=?",  (H,))
+                    if c == compression and str(d) == data:
+                        return r
+                raise
+
+    def _getDataTID(self, oid, tid=None, before_tid=None):
+        partition = self._getPartition(oid)
+        sql = 'SELECT serial, data_id, value_serial FROM obj' \
+              ' WHERE partition=? AND oid=?'
+        if tid is not None:
+            r = self.query(sql + ' AND serial=?', (partition, oid, tid))
+        elif before_tid is not None:
+            r = self.query(sql + ' AND serial<? ORDER BY serial DESC LIMIT 1',
+                           (partition, oid, before_tid))
+        else:
+            r = self.query(sql + ' ORDER BY serial DESC LIMIT 1',
+                           (partition, oid))
+        r = r.fetchone()
+        if r:
+            serial, data_id, value_serial = r
+            if value_serial is None and data_id:
+                return serial, serial
+            return serial, value_serial
+        return None, None
+
+    def finishTransaction(self, tid):
+        args = util.u64(tid),
+        with self as q:
+            sql = " FROM tobj WHERE serial=?"
+            data_id_list = [x for x, in q("SELECT data_id" + sql, args) if x]
+            q("INSERT OR FAIL INTO obj SELECT *" + sql, args)
+            q("DELETE FROM tobj WHERE serial=?", args)
+            q("INSERT OR FAIL INTO trans SELECT * FROM ttrans WHERE tid=?",
+              args)
+            q("DELETE FROM ttrans WHERE tid=?", args)
+        self.unlockData(data_id_list)
+
+    def deleteTransaction(self, tid, oid_list=()):
+        u64 = util.u64
+        tid = u64(tid)
+        getPartition = self._getPartition
+        with self as q:
+            sql = " FROM tobj WHERE serial=?"
+            data_id_list = [x for x, in q("SELECT data_id" + sql, (tid,)) if x]
+            self.unlockData(data_id_list)
+            q("DELETE" + sql, (tid,))
+            q("DELETE FROM ttrans WHERE tid=?", (tid,))
+            q("DELETE FROM trans WHERE partition=? AND tid=?",
+                (getPartition(tid), tid))
+            # delete from obj using indexes
+            data_id_set = set()
+            for oid in oid_list:
+                oid = u64(oid)
+                sql = " FROM obj WHERE partition=? AND oid=? AND serial=?"
+                args = getPartition(oid), oid, tid
+                data_id_set.update(*q("SELECT data_id" + sql, args))
+                q("DELETE" + sql, args)
+            data_id_set.discard(None)
+            self._pruneData(data_id_set)
+
+    def deleteObject(self, oid, serial=None):
+        oid = util.u64(oid)
+        sql = " FROM obj WHERE partition=? AND oid=?"
+        args = [self._getPartition(oid), oid]
+        if serial:
+            sql += " AND serial=?"
+            args.append(util.u64(serial))
+        with self as q:
+            data_id_list = [x for x, in q("SELECT DISTINCT data_id" + sql, args)
+                              if x]
+            q("DELETE" + sql, args)
+            self._pruneData(data_id_list)
+
+    def _deleteRange(self, partition, min_tid=None, max_tid=None):
+        sql = " WHERE partition=?"
+        args = [partition]
+        if min_tid:
+            sql += " AND ? < tid"
+            args.append(util.u64(min_tid))
+        if max_tid:
+            sql += " AND tid <= ?"
+            args.append(util.u64(max_tid))
+        q = self.query
+        q("DELETE FROM trans" + sql, args)
+        sql = " FROM obj" + sql.replace('tid', 'serial')
+        data_id_list = [x for x, in q("SELECT DISTINCT data_id" + sql, args)
+                          if x]
+        q("DELETE" + sql, args)
+        self._pruneData(data_id_list)
+
+    def getTransaction(self, tid, all=False):
+        tid = util.u64(tid)
+        with self as q:
+            r = q("SELECT oids, user, description, ext, packed FROM trans"
+                  " WHERE partition=? AND tid=?",
+                  (self._getPartition(tid), tid)).fetchone()
+            if not r and all:
+                r = q("SELECT oids, user, description, ext, packed FROM ttrans"
+                      " WHERE tid=?", (tid,)).fetchone()
+        if r:
+            oids, user, description, ext, packed = r
+            return splitOIDField(tid, oids), str(user), \
+                str(description), str(ext), packed
+
+    def _getObjectLength(self, oid, value_serial):
+        if value_serial is None:
+            raise CreationUndone
+        length, value_serial = self.query("""SELECT LENGTH(value), value_serial
+            FROM obj LEFT JOIN data ON obj.data_id=data.id
+            WHERE partition=? AND oid=? AND serial=?""",
+            (self._getPartition(oid), oid, value_serial)).fetchone()
+        if length is None:
+            neo.lib.logging.info("Multiple levels of indirection"
+                " when searching for object data for oid %d at tid %d."
+                " This causes suboptimal performance.", oid, value_serial)
+            length = self._getObjectLength(oid, value_serial)
+        return length
+
+    def getObjectHistory(self, oid, offset=0, length=1):
+        # FIXME: This method doesn't take client's current transaction id as
+        # parameter, which means it can return transactions in the future of
+        # client's transaction.
+        p64 = util.p64
+        oid = util.u64(oid)
+        pack_tid = self._getPackTID()
+        result = []
+        append = result.append
+        with self as q:
+            for serial, length, value_serial in q("""\
+                    SELECT serial, LENGTH(value), value_serial
+                    FROM obj LEFT JOIN data ON obj.data_id = data.id
+                    WHERE partition=? AND oid=? AND serial>=?
+                    ORDER BY serial DESC LIMIT ?,?""",
+                    (self._getPartition(oid), oid, pack_tid, offset, length)):
+                if length is None:
+                    try:
+                        length = self._getObjectLength(oid, value_serial)
+                    except CreationUndone:
+                        length = 0
+                append((p64(serial), length))
+        return result or None
+
+    def getReplicationObjectList(self, min_tid, max_tid, length, partition,
+            min_oid):
+        u64 = util.u64
+        p64 = util.p64
+        min_tid = u64(min_tid)
+        return [(p64(serial), p64(oid)) for serial, oid in self.query("""\
+            SELECT serial, oid FROM obj
+            WHERE partition=? AND serial<=?
+            AND (serial=? AND ?<=oid OR ?<serial)
+            ORDER BY serial ASC, oid ASC LIMIT ?""",
+            (partition, u64(max_tid), min_tid, u64(min_oid), min_tid, length))]
+
+    def getTIDList(self, offset, length, partition_list):
+        p64 = util.p64
+        return [p64(t[0]) for t in self.query("""\
+            SELECT tid FROM trans WHERE partition in (%s)
+            ORDER BY tid DESC LIMIT %d,%d"""
+            % (','.join(map(str, partition_list)), offset, length))]
+
+    def getReplicationTIDList(self, min_tid, max_tid, length, partition):
+        u64 = util.u64
+        p64 = util.p64
+        min_tid = u64(min_tid)
+        max_tid = u64(max_tid)
+        return [p64(t[0]) for t in self.query("""\
+            SELECT tid FROM trans
+            WHERE partition=? AND ?<=tid AND tid<=?
+            ORDER BY tid ASC LIMIT ?""",
+            (partition, min_tid, max_tid, length))]
+
+    def _updatePackFuture(self, oid, orig_serial, max_serial):
+        # Before deleting this objects revision, see if there is any
+        # transaction referencing its value at max_serial or above.
+        # If there is, copy value to the first future transaction. Any further
+        # reference is just updated to point to the new data location.
+        partition = self._getPartition(oid)
+        value_serial = None
+        q = self.query
+        for T in '', 't':
+            update = """UPDATE OR FAIL %sobj SET value_serial=?
+                         WHERE partition=? AND oid=? AND serial=?""" % T
+            for serial, in q("""SELECT serial FROM %sobj
+                    WHERE partition=? AND oid=? AND serial>=? AND value_serial=?
+                    ORDER BY serial ASC""" % T,
+                    (partition, oid, max_serial, orig_serial)):
+                q(update, (value_serial, partition, oid, serial))
+                if value_serial is None:
+                    # First found, mark its serial for future reference.
+                    value_serial = serial
+        return value_serial
+
+    def pack(self, tid, updateObjectDataForPack):
+        # TODO: unit test (along with updatePackFuture)
+        p64 = util.p64
+        tid = util.u64(tid)
+        updatePackFuture = self._updatePackFuture
+        getPartition = self._getPartition
+        with self as q:
+            self._setPackTID(tid)
+            for count, oid, max_serial in q("SELECT COUNT(*) - 1, oid,"
+                    " MAX(serial) FROM obj WHERE serial<=? GROUP BY oid",
+                    (tid,)):
+                partition = getPartition(oid)
+                if q("SELECT 1 FROM obj WHERE partition=?"
+                     " AND oid=? AND serial=? AND data_id IS NULL",
+                     (partition, oid, max_serial)).fetchone():
+                    max_serial += 1
+                elif not count:
+                    continue
+                # There are things to delete for this object
+                data_id_set = set()
+                sql = " FROM obj WHERE partition=? AND oid=? AND serial<?"
+                args = partition, oid, max_serial
+                for serial, data_id in q("SELECT serial, data_id" + sql, args):
+                    data_id_set.add(data_id)
+                    new_serial = updatePackFuture(oid, serial, max_serial)
+                    if new_serial:
+                        new_serial = p64(new_serial)
+                    updateObjectDataForPack(p64(oid), p64(serial),
+                                            new_serial, data_id)
+                q("DELETE" + sql, args)
+                data_id_set.discard(None)
+                self._pruneData(data_id_set)
+
+    def checkTIDRange(self, min_tid, max_tid, length, partition):
+        count, tids, max_tid = self.query("""\
+            SELECT COUNT(*), GROUP_CONCAT(tid), MAX(tid)
+            FROM (SELECT tid FROM trans
+                  WHERE partition=? AND ?<=tid AND tid<=?
+                  ORDER BY tid ASC LIMIT ?) AS t""",
+            (partition, util.u64(min_tid), util.u64(max_tid),
+             -1 if length is None else length)).fetchone()
+        if count:
+            return count, sha1(tids).digest(), util.p64(max_tid)
+        return 0, ZERO_HASH, ZERO_TID
+
+    def checkSerialRange(self, min_oid, min_serial, max_tid, length, partition):
+        u64 = util.u64
+        # We don't ask MySQL to compute everything (like in checkTIDRange)
+        # because it's difficult to get the last serial _for the last oid_.
+        # We would need a function (that could be named 'LAST') that returns the
+        # last grouped value, instead of the greatest one.
+        min_oid = u64(min_oid)
+        r = self.query("""\
+            SELECT oid, serial
+            FROM obj
+            WHERE partition=? AND serial<=?
+              AND (oid>? OR oid=? AND serial>=?)
+            ORDER BY oid ASC, serial ASC LIMIT ?""",
+            (partition, u64(max_tid), min_oid, min_oid, u64(min_serial),
+             -1 if length is None else length)).fetchall()
+        if r:
+            p64 = util.p64
+            return (len(r),
+                    sha1(','.join(str(x[0]) for x in r)).digest(),
+                    p64(r[-1][0]),
+                    sha1(','.join(str(x[1]) for x in r)).digest(),
+                    p64(r[-1][1]))
+        return 0, ZERO_HASH, ZERO_OID, ZERO_HASH, ZERO_TID

neo/storage/handlers/__init__.py

@@ -18,15 +18,15 @@
 import neo
 
 from neo.lib.handler import EventHandler
-from neo.lib import protocol
 from neo.lib.util import dump
 from neo.lib.exception import PrimaryFailure, OperationFailure
-from neo.lib.protocol import NodeStates, NodeTypes, Packets, Errors, ZERO_HASH
+from neo.lib.protocol import NodeStates, NodeTypes
 
 class BaseMasterHandler(EventHandler):
 
     def connectionLost(self, conn, new_state):
         if self.app.listening_conn: # if running
+            self.app.master_node = None
             raise PrimaryFailure('connection lost')
 
     def stopOperation(self, conn):
@@ -62,44 +62,5 @@ class BaseMasterHandler(EventHandler):
                         dump(uuid))
                 self.app.tm.abortFor(uuid)
 
-
-class BaseClientAndStorageOperationHandler(EventHandler):
-    """ Accept requests common to client and storage nodes """
-
-    def askTransactionInformation(self, conn, tid):
-        app = self.app
-        t = app.dm.getTransaction(tid)
-        if t is None:
-            p = Errors.TidNotFound('%s does not exist' % dump(tid))
-        else:
-            p = Packets.AnswerTransactionInformation(tid, t[1], t[2], t[3],
-                    t[4], t[0])
-        conn.answer(p)
-
-    def _askObject(self, oid, serial, tid):
-        raise NotImplementedError
-
-    def askObject(self, conn, oid, serial, tid):
-        app = self.app
-        if self.app.tm.loadLocked(oid):
-            # Delay the response.
-            app.queueEvent(self.askObject, conn, (oid, serial, tid))
-            return
-        o = self._askObject(oid, serial, tid)
-        if o is None:
-            neo.lib.logging.debug('oid = %s does not exist', dump(oid))
-            p = Errors.OidDoesNotExist(dump(oid))
-        elif o is False:
-            neo.lib.logging.debug('oid = %s not found', dump(oid))
-            p = Errors.OidNotFound(dump(oid))
-        else:
-            serial, next_serial, compression, checksum, data, data_serial = o
-            neo.lib.logging.debug('oid = %s, serial = %s, next_serial = %s',
-                          dump(oid), dump(serial), dump(next_serial))
-            if checksum is None:
-                checksum = ZERO_HASH
-                data = ''
-            p = Packets.AnswerObject(oid, serial, next_serial,
-                compression, checksum, data, data_serial)
-        conn.answer(p)
-
+    def answerUnfinishedTransactions(self, conn, *args, **kw):
+        self.app.replicator.setUnfinishedTIDList(*args, **kw)

neo/storage/handlers/client.py

@@ -16,10 +16,10 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 
 import neo.lib
-from neo.lib import protocol
+from neo.lib.handler import EventHandler
 from neo.lib.util import dump, makeChecksum
-from neo.lib.protocol import Packets, LockState, Errors, ZERO_HASH
-from . import BaseClientAndStorageOperationHandler
+from neo.lib.protocol import Packets, LockState, Errors, ProtocolError, \
+    ZERO_HASH, INVALID_PARTITION
 from ..transactions import ConflictError, DelayedError
 from ..exception import AlreadyPendingError
 import time
@@ -28,10 +28,40 @@ import time
 # Set to None to disable.
 SLOW_STORE = 2
 
-class ClientOperationHandler(BaseClientAndStorageOperationHandler):
+class ClientOperationHandler(EventHandler):
 
-    def _askObject(self, oid, serial, ttid):
-        return self.app.dm.getObject(oid, serial, ttid)
+    def askTransactionInformation(self, conn, tid):
+        t = self.app.dm.getTransaction(tid)
+        if t is None:
+            p = Errors.TidNotFound('%s does not exist' % dump(tid))
+        else:
+            p = Packets.AnswerTransactionInformation(tid, t[1], t[2], t[3],
+                    t[4], t[0])
+        conn.answer(p)
+
+    def askObject(self, conn, oid, serial, tid):
+        app = self.app
+        if app.tm.loadLocked(oid):
+            # Delay the response.
+            app.queueEvent(self.askObject, conn, (oid, serial, tid))
+            return
+        o = app.dm.getObject(oid, serial, tid)
+        if o is None:
+            neo.lib.logging.debug('oid = %s does not exist', dump(oid))
+            p = Errors.OidDoesNotExist(dump(oid))
+        elif o is False:
+            neo.lib.logging.debug('oid = %s not found', dump(oid))
+            p = Errors.OidNotFound(dump(oid))
+        else:
+            serial, next_serial, compression, checksum, data, data_serial = o
+            neo.lib.logging.debug('oid = %s, serial = %s, next_serial = %s',
+                          dump(oid), dump(serial), dump(next_serial))
+            if checksum is None:
+                checksum = ZERO_HASH
+                data = ''
+            p = Packets.AnswerObject(oid, serial, next_serial,
+                compression, checksum, data, data_serial)
+        conn.answer(p)
 
     def connectionLost(self, conn, new_state):
         uuid = conn.getUUID()
@@ -96,22 +126,18 @@ class ClientOperationHandler(BaseClientAndStorageOperationHandler):
         self._askStoreObject(conn, oid, serial, compression, checksum, data,
             data_serial, ttid, unlock, time.time())
 
-    def askTIDsFrom(self, conn, min_tid, max_tid, length, partition_list):
-        getReplicationTIDList = self.app.dm.getReplicationTIDList
-        tid_list = []
-        extend = tid_list.extend
-        for partition in partition_list:
-            extend(getReplicationTIDList(min_tid, max_tid, length, partition))
-        conn.answer(Packets.AnswerTIDsFrom(tid_list))
+    def askTIDsFrom(self, conn, min_tid, max_tid, length, partition):
+        conn.answer(Packets.AnswerTIDsFrom(self.app.dm.getReplicationTIDList(
+            min_tid, max_tid, length, partition)))
 
     def askTIDs(self, conn, first, last, partition):
         # This method is complicated, because I must return TIDs only
         # about usable partitions assigned to me.
         if first >= last:
-            raise protocol.ProtocolError('invalid offsets')
+            raise ProtocolError('invalid offsets')
 
         app = self.app
-        if partition == protocol.INVALID_PARTITION:
+        if partition == INVALID_PARTITION:
             partition_list = app.pt.getAssignedPartitionList(app.uuid)
         else:
             partition_list = [partition]
@@ -149,7 +175,7 @@ class ClientOperationHandler(BaseClientAndStorageOperationHandler):
 
     def askObjectHistory(self, conn, oid, first, last):
         if first >= last:
-            raise protocol.ProtocolError( 'invalid offsets')
+            raise ProtocolError('invalid offsets')
 
         app = self.app
         history_list = app.dm.getObjectHistory(oid, first, last - first)

neo/storage/handlers/identification.py

@@ -21,6 +21,7 @@ from neo.lib.handler import EventHandler
 from neo.lib.protocol import NodeTypes, Packets, NotReadyError
 from neo.lib.protocol import ProtocolError, BrokenNodeDisallowedError
 from neo.lib.util import dump
+from .storage import StorageOperationHandler
 
 class IdentificationHandler(EventHandler):
     """ Handler used for incoming connections during operation state """
@@ -35,6 +36,14 @@ class IdentificationHandler(EventHandler):
         if not self.app.ready:
             raise NotReadyError
         app = self.app
+        if uuid is None:
+            if node_type != NodeTypes.STORAGE:
+                raise ProtocolError('reject anonymous non-storage node')
+            handler = StorageOperationHandler(self.app)
+            conn.setHandler(handler)
+        else:
+            if uuid == app.uuid:
+                raise ProtocolError("uuid conflict or loopback connection")
             node = app.nm.getByUUID(uuid)
             # If this node is broken, reject it.
             if node is not None and node.isBroken():
@@ -51,21 +60,18 @@ class IdentificationHandler(EventHandler):
                     assert not node.isConnected()
                 node.setRunning()
             elif node_type == NodeTypes.STORAGE:
-            from .storage import StorageOperationHandler
-            handler = StorageOperationHandler
                 if node is None:
                     neo.lib.logging.error('reject an unknown storage node %s',
                         dump(uuid))
                     raise NotReadyError
+                handler = StorageOperationHandler
             else:
                 raise ProtocolError('reject non-client-or-storage node')
             # apply the handler and set up the connection
             handler = handler(self.app)
             conn.setHandler(handler)
-        node.setConnection(conn)
-        args = (NodeTypes.STORAGE, app.uuid, app.pt.getPartitions(),
-            app.pt.getReplicas(), uuid)
+            node.setConnection(conn, app.uuid < uuid)
         # accept the identification and trigger an event
-        conn.answer(Packets.AcceptIdentification(*args))
+        conn.answer(Packets.AcceptIdentification(NodeTypes.STORAGE, uuid and
+            app.uuid, app.pt.getPartitions(), app.pt.getReplicas(), uuid))
         handler.connectionCompleted(conn)
-

neo/storage/handlers/initialization.py

@@ -25,10 +25,6 @@ class InitializationHandler(BaseMasterHandler):
     def answerNodeInformation(self, conn):
         pass
 
-    def notifyNodeInformation(self, conn, node_list):
-        # the whole node list is received here
-        BaseMasterHandler.notifyNodeInformation(self, conn, node_list)
-
     def answerPartitionTable(self, conn, ptid, row_list):
         app = self.app
         pt = app.pt
@@ -53,8 +49,9 @@ class InitializationHandler(BaseMasterHandler):
 
         app.dm.setPartitionTable(ptid, cell_list)
 
-    def answerLastIDs(self, conn, loid, ltid, lptid):
+    def answerLastIDs(self, conn, loid, ltid, lptid, backup_tid):
         self.app.dm.setLastOID(loid)
+        self.app.dm.setBackupTID(backup_tid)
 
     def notifyPartitionChanges(self, conn, ptid, cell_list):
         # XXX: This is safe to ignore those notifications because all of the

neo/storage/handlers/master.py

@@ -24,11 +24,8 @@ from . import BaseMasterHandler
 class MasterOperationHandler(BaseMasterHandler):
     """ This handler is used for the primary master """
 
-    def answerUnfinishedTransactions(self, conn, max_tid, ttid_list):
-        self.app.replicator.setUnfinishedTIDList(max_tid, ttid_list)
-
-    def notifyTransactionFinished(self, conn, ttid, max_tid):
-        self.app.replicator.transactionFinished(ttid, max_tid)
+    def notifyTransactionFinished(self, conn, *args, **kw):
+        self.app.replicator.transactionFinished(*args, **kw)
 
     def notifyPartitionChanges(self, conn, ptid, cell_list):
         """This is very similar to Send Partition Table, except that
@@ -44,14 +41,7 @@ class MasterOperationHandler(BaseMasterHandler):
         app.dm.changePartitionTable(ptid, cell_list)
 
         # Check changes for replications
-        if app.replicator is not None:
-            for offset, uuid, state in cell_list:
-                if uuid == app.uuid:
-                    # If this is for myself, this can affect replications.
-                    if state == CellStates.DISCARDED:
-                        app.replicator.removePartition(offset)
-                    elif state == CellStates.OUT_OF_DATE:
-                        app.replicator.addPartition(offset)
+        app.replicator.notifyPartitionChanges(cell_list)
 
     def askLockInformation(self, conn, ttid, tid, oid_list):
         if not ttid in self.app.tm:
@@ -74,3 +64,11 @@ class MasterOperationHandler(BaseMasterHandler):
         if not conn.isClosed():
             conn.answer(Packets.AnswerPack(True))
 
+    def replicate(self, conn, tid, upstream_name, source_dict):
+        self.app.replicator.backup(tid,
+            dict((p, (a, upstream_name))
+                 for p, a in source_dict.iteritems()))
+
+    def askTruncate(self, conn, tid):
+        self.app.dm.truncate(tid)
+        conn.answer(Packets.AnswerTruncate())

neo/storage/handlers/replication.py

-
-#
-# Copyright (C) 2006-2010  Nexedi SA
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-
-from functools import wraps
-import neo.lib
-
-from neo.lib.handler import EventHandler
-from neo.lib.protocol import Packets, ZERO_HASH, ZERO_TID, ZERO_OID
-from neo.lib.util import add64, u64
-
-# TODO: benchmark how different values behave
-RANGE_LENGTH = 4000
-MIN_RANGE_LENGTH = 1000
-
-CHECK_CHUNK = 0
-CHECK_REPLICATE = 1
-CHECK_DONE = 2
-
-"""
-Replication algorithm
-
-Purpose: replicate the content of a reference node into a replicating node,
-bringing it up-to-date.
-This happens both when a new storage is added to en existing cluster, as well
-as when a nde was separated from cluster and rejoins it.
-
-Replication happens per partition. Reference node can change between
-partitions.
-
-2 parts, done sequentially:
-- Transaction (metadata) replication
-- Object (data) replication
-
-Both parts follow the same mechanism:
-- On both sides (replicating and reference), compute a checksum of a chunk
-  (RANGE_LENGTH number of entries). If there is a mismatch, chunk size is
-  reduced, and scan restarts from same row, until it reaches a minimal length
-  (MIN_RANGE_LENGTH). Then, it replicates all rows in that chunk. If the
-  content of chunks match, it moves on to the next chunk.
-- Replicating a chunk starts with asking for a list of all entries (only their
-  identifier) and skipping those both side have, deleting those which reference
-  has and replicating doesn't, and asking individually all entries missing in
-  replicating.
-"""
-
-# TODO: Make object replication get ordered by serial first and oid second, so
-# changes are in a big segment at the end, rather than in many segments (one
-# per object).
-
-# TODO: To improve performance when a pack happened, the following algorithm
-# should be used:
-# - If reference node packed, find non-existant oids in reference node (their
-#   creation was undone, and pack pruned them), and delete them.
-# - Run current algorithm, starting at our last pack TID.
-# - Pack partition at reference's TID.
-
-def checkConnectionIsReplicatorConnection(func):
-    def decorator(self, conn, *args, **kw):
-        if self.app.replicator.isCurrentConnection(conn):
-            return func(self, conn, *args, **kw)
-        # Should probably raise & close connection...
-    return wraps(func)(decorator)
-
-class ReplicationHandler(EventHandler):
-    """This class handles events for replications."""
-
-    def connectionLost(self, conn, new_state):
-        replicator = self.app.replicator
-        if replicator.isCurrentConnection(conn):
-            if replicator.pending():
-                neo.lib.logging.warning(
-                    'replication is stopped due to a connection lost')
-            replicator.storageLost()
-
-    def connectionFailed(self, conn):
-        neo.lib.logging.warning(
-                        'replication is stopped due to connection failure')
-        self.app.replicator.storageLost()
-
-    def acceptIdentification(self, conn, node_type,
-                       uuid, num_partitions, num_replicas, your_uuid):
-        self.startReplication(conn)
-
-    def startReplication(self, conn):
-        max_tid = self.app.replicator.getCurrentCriticalTID()
-        conn.ask(self._doAskCheckTIDRange(ZERO_TID, max_tid), timeout=300)
-
-    @checkConnectionIsReplicatorConnection
-    def answerTIDsFrom(self, conn, tid_list):
-        assert tid_list
-        app = self.app
-        ask = conn.ask
-        # If I have pending TIDs, check which TIDs I don't have, and
-        # request the data.
-        tid_set = frozenset(tid_list)
-        my_tid_set = frozenset(app.replicator.getTIDsFromResult())
-        extra_tid_set = my_tid_set - tid_set
-        if extra_tid_set:
-            deleteTransaction = app.dm.deleteTransaction
-            for tid in extra_tid_set:
-                deleteTransaction(tid)
-        missing_tid_set = tid_set - my_tid_set
-        for tid in missing_tid_set:
-            ask(Packets.AskTransactionInformation(tid), timeout=300)
-        if len(tid_list) == MIN_RANGE_LENGTH:
-            # If we received fewer, we knew it before sending AskTIDsFrom, and
-            # we should have finished TID replication at that time.
-            max_tid = self.app.replicator.getCurrentCriticalTID()
-            ask(self._doAskCheckTIDRange(add64(tid_list[-1], 1), max_tid,
-                RANGE_LENGTH))
-
-    @checkConnectionIsReplicatorConnection
-    def answerTransactionInformation(self, conn, tid,
-                                           user, desc, ext, packed, oid_list):
-        app = self.app
-        # Directly store the transaction.
-        app.dm.storeTransaction(tid, (), (oid_list, user, desc, ext, packed),
-            False)
-
-    @checkConnectionIsReplicatorConnection
-    def answerObjectHistoryFrom(self, conn, object_dict):
-        assert object_dict
-        app = self.app
-        ask = conn.ask
-        deleteObject = app.dm.deleteObject
-        my_object_dict = app.replicator.getObjectHistoryFromResult()
-        object_set = set()
-        max_oid = max(object_dict.iterkeys())
-        max_serial = max(object_dict[max_oid])
-        for oid, serial_list in object_dict.iteritems():
-            for serial in serial_list:
-                object_set.add((oid, serial))
-        my_object_set = set()
-        for oid, serial_list in my_object_dict.iteritems():
-            filter = lambda x: True
-            if max_oid is not None:
-                if oid > max_oid:
-                    continue
-                elif oid == max_oid:
-                    filter = lambda x: x <= max_serial
-            for serial in serial_list:
-                if filter(serial):
-                    my_object_set.add((oid, serial))
-        extra_object_set = my_object_set - object_set
-        for oid, serial in extra_object_set:
-            deleteObject(oid, serial)
-        missing_object_set = object_set - my_object_set
-        for oid, serial in missing_object_set:
-            if not app.dm.objectPresent(oid, serial):
-                ask(Packets.AskObject(oid, serial, None), timeout=300)
-        if sum(map(len, object_dict.itervalues())) == MIN_RANGE_LENGTH:
-            max_tid = self.app.replicator.getCurrentCriticalTID()
-            ask(self._doAskCheckSerialRange(max_oid, add64(max_serial, 1),
-                max_tid, RANGE_LENGTH))
-
-    @checkConnectionIsReplicatorConnection
-    def answerObject(self, conn, oid, serial_start,
-            serial_end, compression, checksum, data, data_serial):
-        dm = self.app.dm
-        if data or checksum != ZERO_HASH:
-            data_id = dm.storeData(checksum, data, compression)
-        else:
-            data_id = None
-        # Directly store the transaction.
-        obj = oid, data_id, data_serial
-        dm.storeTransaction(serial_start, [obj], None, False)
-
-    def _doAskCheckSerialRange(self, min_oid, min_tid, max_tid,
-            length=RANGE_LENGTH):
-        replicator = self.app.replicator
-        partition = replicator.getCurrentOffset()
-        neo.lib.logging.debug("Check serial range (offset=%s, min_oid=%x,"
-            " min_tid=%x, max_tid=%x, length=%s)", partition, u64(min_oid),
-            u64(min_tid), u64(max_tid), length)
-        check_args = (min_oid, min_tid, max_tid, length, partition)
-        replicator.checkSerialRange(*check_args)
-        return Packets.AskCheckSerialRange(*check_args)
-
-    def _doAskCheckTIDRange(self, min_tid, max_tid, length=RANGE_LENGTH):
-        replicator = self.app.replicator
-        partition = replicator.getCurrentOffset()
-        neo.lib.logging.debug(
-            "Check TID range (offset=%s, min_tid=%x, max_tid=%x, length=%s)",
-            partition, u64(min_tid), u64(max_tid), length)
-        replicator.checkTIDRange(min_tid, max_tid, length, partition)
-        return Packets.AskCheckTIDRange(min_tid, max_tid, length, partition)
-
-    def _doAskTIDsFrom(self, min_tid, length):
-        replicator = self.app.replicator
-        partition_id = replicator.getCurrentOffset()
-        max_tid = replicator.getCurrentCriticalTID()
-        replicator.getTIDsFrom(min_tid, max_tid, length, partition_id)
-        neo.lib.logging.debug("Ask TIDs (offset=%s, min_tid=%x, max_tid=%x,"
-            "length=%s)", partition_id, u64(min_tid), u64(max_tid), length)
-        return Packets.AskTIDsFrom(min_tid, max_tid, length, [partition_id])
-
-    def _doAskObjectHistoryFrom(self, min_oid, min_serial, length):
-        replicator = self.app.replicator
-        partition_id = replicator.getCurrentOffset()
-        max_serial = replicator.getCurrentCriticalTID()
-        replicator.getObjectHistoryFrom(min_oid, min_serial, max_serial,
-            length, partition_id)
-        return Packets.AskObjectHistoryFrom(min_oid, min_serial, max_serial,
-            length, partition_id)
-
-    def _checkRange(self, match, current_boundary, next_boundary, length,
-            count):
-        if count == 0:
-            # Reference storage has no data for this chunk, stop and truncate.
-            return CHECK_DONE, (current_boundary, )
-        if match:
-            # Same data on both sides
-            if length < RANGE_LENGTH and length == count:
-                # ...and previous check detected a difference - and we still
-                # haven't reached the end. This means that we just check the
-                # first half of a chunk which, as a whole, is different. So
-                # next test must happen on the next chunk.
-                recheck_min_boundary = next_boundary
-            else:
-                # ...and we just checked a whole chunk, move on to the next
-                # one.
-                recheck_min_boundary = None
-        else:
-            # Something is different in current chunk
-            recheck_min_boundary = current_boundary
-        if recheck_min_boundary is None:
-            if count == length:
-                # Go on with next chunk
-                action = CHECK_CHUNK
-                params = (next_boundary, RANGE_LENGTH)
-            else:
-                # No more chunks.
-                action = CHECK_DONE
-                params = (next_boundary, )
-        else:
-            # We must recheck current chunk.
-            if not match and count <= MIN_RANGE_LENGTH:
-                # We are already at minimum chunk length, replicate.
-                action = CHECK_REPLICATE
-                params = (recheck_min_boundary, )
-            else:
-                # Check a smaller chunk.
-                # Note: +1, so we can detect we reached the end when answer
-                # comes back.
-                action = CHECK_CHUNK
-                params = (recheck_min_boundary, max(min(length / 2, count + 1),
-                                                    MIN_RANGE_LENGTH))
-        return action, params
-
-    @checkConnectionIsReplicatorConnection
-    def answerCheckTIDRange(self, conn, min_tid, length, count, tid_checksum,
-            max_tid):
-        pkt_min_tid = min_tid
-        ask = conn.ask
-        app = self.app
-        replicator = app.replicator
-        next_tid = add64(max_tid, 1)
-        action, params = self._checkRange(
-            replicator.getTIDCheckResult(min_tid, length) == (
-            count, tid_checksum, max_tid), min_tid, next_tid, length,
-            count)
-        critical_tid = replicator.getCurrentCriticalTID()
-        if action == CHECK_REPLICATE:
-            (min_tid, ) = params
-            ask(self._doAskTIDsFrom(min_tid, count))
-            if length != count:
-                action = CHECK_DONE
-                params = (next_tid, )
-        if action == CHECK_CHUNK:
-            (min_tid, count) = params
-            if min_tid >= critical_tid:
-                # Stop if past critical TID
-                action = CHECK_DONE
-                params = (next_tid, )
-            else:
-                ask(self._doAskCheckTIDRange(min_tid, critical_tid, count))
-        if action == CHECK_DONE:
-            # Delete all transactions we might have which are beyond what peer
-            # knows.
-            (last_tid, ) = params
-            offset = replicator.getCurrentOffset()
-            neo.lib.logging.debug("TID range checked (offset=%s, min_tid=%x,"
-                " length=%s, count=%s, max_tid=%x, last_tid=%x,"
-                " critical_tid=%x)", offset, u64(pkt_min_tid), length, count,
-                u64(max_tid), u64(last_tid), u64(critical_tid))
-            app.dm.deleteTransactionsAbove(offset, last_tid, critical_tid)
-            # If no more TID, a replication of transactions is finished.
-            # So start to replicate objects now.
-            ask(self._doAskCheckSerialRange(ZERO_OID, ZERO_TID, critical_tid))
-
-    @checkConnectionIsReplicatorConnection
-    def answerCheckSerialRange(self, conn, min_oid, min_serial, length, count,
-            oid_checksum, max_oid, serial_checksum, max_serial):
-        ask = conn.ask
-        app = self.app
-        replicator = app.replicator
-        next_params = (max_oid, add64(max_serial, 1))
-        action, params = self._checkRange(
-            replicator.getSerialCheckResult(min_oid, min_serial, length) == (
-            count, oid_checksum, max_oid, serial_checksum, max_serial),
-            (min_oid, min_serial), next_params, length, count)
-        if action == CHECK_REPLICATE:
-            ((min_oid, min_serial), ) = params
-            ask(self._doAskObjectHistoryFrom(min_oid, min_serial, count))
-            if length != count:
-                action = CHECK_DONE
-                params = (next_params, )
-        if action == CHECK_CHUNK:
-            ((min_oid, min_serial), count) = params
-            max_tid = replicator.getCurrentCriticalTID()
-            ask(self._doAskCheckSerialRange(min_oid, min_serial, max_tid, count))
-        if action == CHECK_DONE:
-            # Delete all objects we might have which are beyond what peer
-            # knows.
-            ((last_oid, last_serial), ) = params
-            offset = replicator.getCurrentOffset()
-            max_tid = replicator.getCurrentCriticalTID()
-            neo.lib.logging.debug("Serial range checked (offset=%s, min_oid=%x,"
-                " min_serial=%x, length=%s, count=%s, max_oid=%x,"
-                " max_serial=%x, last_oid=%x, last_serial=%x, critical_tid=%x)",
-                offset, u64(min_oid), u64(min_serial), length, count,
-                u64(max_oid), u64(max_serial), u64(last_oid), u64(last_serial),
-                u64(max_tid))
-            app.dm.deleteObjectsAbove(offset, last_oid, last_serial, max_tid)
-            # Nothing remains, so the replication for this partition is
-            # finished.
-            replicator.setReplicationDone()
-

neo/storage/handlers/storage.py

@@ -15,36 +15,101 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 
-from . import BaseClientAndStorageOperationHandler
-from neo.lib.protocol import Packets
+import weakref
+from functools import wraps
+import neo.lib
+from neo.lib.connector import ConnectorConnectionClosedException
+from neo.lib.handler import EventHandler
+from neo.lib.protocol import Errors, NodeStates, Packets, \
+    ZERO_HASH, ZERO_TID, ZERO_OID
+from neo.lib.util import add64, u64
 
-class StorageOperationHandler(BaseClientAndStorageOperationHandler):
+def checkConnectionIsReplicatorConnection(func):
+    def decorator(self, conn, *args, **kw):
+        assert self.app.replicator.getCurrentConnection() is conn
+        return func(self, conn, *args, **kw)
+    return wraps(func)(decorator)
 
-    def _askObject(self, oid, serial, tid):
-        result = self.app.dm.getObject(oid, serial, tid)
-        if result and result[5]:
-            return result[:2] + (None, None, None) + result[4:]
-        return result
+class StorageOperationHandler(EventHandler):
+    """This class handles events for replications."""
 
-    def askLastIDs(self, conn):
-        app = self.app
-        oid = app.dm.getLastOID()
-        tid = app.dm.getLastTID()
-        conn.answer(Packets.AnswerLastIDs(oid, tid, app.pt.getID()))
-
-    def askTIDsFrom(self, conn, min_tid, max_tid, length, partition_list):
-        assert len(partition_list) == 1, partition_list
-        tid_list = self.app.dm.getReplicationTIDList(min_tid, max_tid, length,
-            partition_list[0])
-        conn.answer(Packets.AnswerTIDsFrom(tid_list))
-
-    def askObjectHistoryFrom(self, conn, min_oid, min_serial, max_serial,
-            length, partition):
-        object_dict = self.app.dm.getObjectHistoryFrom(min_oid, min_serial,
-            max_serial, length, partition)
-        conn.answer(Packets.AnswerObjectHistoryFrom(object_dict))
+    def connectionLost(self, conn, new_state):
+        if self.app.listening_conn and conn.isClient():
+            # XXX: Connection and Node should merged.
+            uuid = conn.getUUID()
+            if uuid:
+                node = self.app.nm.getByUUID(uuid)
+            else:
+                node = self.app.nm.getByAddress(conn.getAddress())
+                node.setState(NodeStates.DOWN)
+            replicator = self.app.replicator
+            if replicator.current_node is node:
+                replicator.abort()
+
+    # Client
+
+    def connectionFailed(self, conn):
+        if self.app.listening_conn:
+            self.app.replicator.abort()
+
+    @checkConnectionIsReplicatorConnection
+    def acceptIdentification(self, conn, node_type,
+                       uuid, num_partitions, num_replicas, your_uuid):
+        self.app.replicator.fetchTransactions()
+
+    @checkConnectionIsReplicatorConnection
+    def answerFetchTransactions(self, conn, pack_tid, next_tid, tid_list):
+        if tid_list:
+            deleteTransaction = self.app.dm.deleteTransaction
+            for tid in tid_list:
+                deleteTransaction(tid)
+        assert not pack_tid, "TODO"
+        if next_tid:
+            self.app.replicator.fetchTransactions(next_tid)
+        else:
+            self.app.replicator.fetchObjects()
+
+    @checkConnectionIsReplicatorConnection
+    def addTransaction(self, conn, tid, user, desc, ext, packed, oid_list):
+        # Directly store the transaction.
+        self.app.dm.storeTransaction(tid, (),
+            (oid_list, user, desc, ext, packed), False)
+
+    @checkConnectionIsReplicatorConnection
+    def answerFetchObjects(self, conn, pack_tid, next_tid,
+                                       next_oid, object_dict):
+        if object_dict:
+            deleteObject = self.app.dm.deleteObject
+            for serial, oid_list in object_dict.iteritems():
+                for oid in oid_list:
+                    delObject(oid, serial)
+        assert not pack_tid, "TODO"
+        if next_tid:
+            self.app.replicator.fetchObjects(next_tid, next_oid)
+        else:
+            self.app.replicator.finish()
+
+    @checkConnectionIsReplicatorConnection
+    def addObject(self, conn, oid, serial, compression,
+                              checksum, data, data_serial):
+        dm = self.app.dm
+        if data or checksum != ZERO_HASH:
+            data_id = dm.storeData(checksum, data, compression)
+        else:
+            data_id = None
+        # Directly store the transaction.
+        obj = oid, data_id, data_serial
+        dm.storeTransaction(serial, (obj,), None, False)
+
+    @checkConnectionIsReplicatorConnection
+    def replicationError(self, conn, message):
+        self.app.replicator.abort('source message: ' + message)
+
+    # Server (all methods must set connection as server so that it isn't closed
+    #         if client tasks are finished)
 
     def askCheckTIDRange(self, conn, min_tid, max_tid, length, partition):
+        conn.asServer()
         count, tid_checksum, max_tid = self.app.dm.checkTIDRange(min_tid,
             max_tid, length, partition)
         conn.answer(Packets.AnswerCheckTIDRange(min_tid, length,
@@ -52,9 +117,91 @@ class StorageOperationHandler(BaseClientAndStorageOperationHandler):
 
     def askCheckSerialRange(self, conn, min_oid, min_serial, max_tid, length,
             partition):
+        conn.asServer()
         count, oid_checksum, max_oid, serial_checksum, max_serial = \
             self.app.dm.checkSerialRange(min_oid, min_serial, max_tid, length,
                 partition)
         conn.answer(Packets.AnswerCheckSerialRange(min_oid, min_serial, length,
             count, oid_checksum, max_oid, serial_checksum, max_serial))
 
+    def askFetchTransactions(self, conn, partition, length, min_tid, max_tid,
+            tid_list):
+        app = self.app
+        cell = app.pt.getCell(partition, app.uuid)
+        if cell is None or cell.isOutOfDate():
+            return conn.answer(Errors.ReplicationError(
+                "partition %u not readable" % partition))
+        conn.asServer()
+        msg_id = conn.getPeerId()
+        conn = weakref.proxy(conn)
+        peer_tid_set = set(tid_list)
+        dm = app.dm
+        tid_list = dm.getReplicationTIDList(min_tid, max_tid, length + 1,
+            partition)
+        next_tid = tid_list.pop() if length < len(tid_list) else None
+        def push():
+            try:
+                pack_tid = None # TODO
+                for tid in tid_list:
+                    if tid in peer_tid_set:
+                        peer_tid_set.remove(tid)
+                    else:
+                        t = dm.getTransaction(tid)
+                        if t is None:
+                            conn.answer(Errors.ReplicationError(
+                                "partition %u dropped" % partition))
+                            return
+                        oid_list, user, desc, ext, packed = t
+                        conn.notify(Packets.AddTransaction(
+                            tid, user, desc, ext, packed, oid_list))
+                        yield
+                conn.answer(Packets.AnswerFetchTransactions(
+                    pack_tid, next_tid, peer_tid_set), msg_id)
+                yield
+            except (weakref.ReferenceError, ConnectorConnectionClosedException):
+                pass
+        app.newTask(push())
+
+    def askFetchObjects(self, conn, partition, length, min_tid, max_tid,
+            min_oid, object_dict):
+        app = self.app
+        cell = app.pt.getCell(partition, app.uuid)
+        if cell is None or cell.isOutOfDate():
+            return conn.answer(Errors.ReplicationError(
+                "partition %u not readable" % partition))
+        conn.asServer()
+        msg_id = conn.getPeerId()
+        conn = weakref.proxy(conn)
+        dm = app.dm
+        object_list = dm.getReplicationObjectList(min_tid, max_tid, length,
+            partition, min_oid)
+        if length < len(object_list):
+            next_tid, next_oid = object_list.pop()
+        else:
+            next_tid = next_oid = None
+        def push():
+            try:
+                pack_tid = None # TODO
+                for serial, oid in object_list:
+                    oid_set = object_dict.get(serial)
+                    if oid_set:
+                        if type(oid_set) is list:
+                            object_dict[serial] = oid_set = set(oid_set)
+                        if oid in oid_set:
+                            oid_set.remove(oid)
+                            if not oid_set:
+                                del object_dict[serial]
+                            continue
+                    object = dm.getObject(oid, serial)
+                    if object is None:
+                        conn.answer(Errors.ReplicationError(
+                            "partition %u dropped" % partition))
+                        return
+                    conn.notify(Packets.AddObject(oid, serial, *object[2:]))
+                    yield
+                conn.answer(Packets.AnswerFetchObjects(
+                    pack_tid, next_tid, next_oid, object_dict), msg_id)
+                yield
+            except (weakref.ReferenceError, ConnectorConnectionClosedException):
+                pass
+        app.newTask(push())

neo/storage/handlers/verification.py

@@ -27,15 +27,11 @@ class VerificationHandler(BaseMasterHandler):
 
     def askLastIDs(self, conn):
         app = self.app
-        try:
-            oid = app.dm.getLastOID()
-        except KeyError:
-            oid = None
-        try:
-            tid = app.dm.getLastTID()
-        except KeyError:
-            tid = None
-        conn.answer(Packets.AnswerLastIDs(oid, tid, app.pt.getID()))
+        conn.answer(Packets.AnswerLastIDs(
+            app.dm.getLastOID(),
+            app.dm.getLastTIDs()[0],
+            app.pt.getID(),
+            app.dm.getBackupTID()))
 
     def askPartitionTable(self, conn):
         pt = self.app.pt

neo/storage/replicator.py

@@ -15,363 +15,300 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 
-import neo.lib
-from random import choice
+"""
+Replication algorithm
 
-from .handlers import replication
-from neo.lib.protocol import NodeTypes, NodeStates, Packets
-from neo.lib.connection import ClientConnection
-from neo.lib.util import dump
+Purpose: replicate the content of a reference node into a replicating node,
+bringing it up-to-date. This happens in the following cases:
+- A new storage is added to en existing cluster.
+- A node was separated from cluster and rejoins it.
+- In a backup cluster, the master notifies a node that new data exists upstream
+  (note that in this case, the cell is always marked as UP_TO_DATE).
 
-class Partition(object):
-    """This class abstracts the state of a partition."""
+Replication happens per partition. Reference node can change between
+partitions.
 
-    def __init__(self, offset, max_tid, ttid_list):
-        # Possible optimization:
-        #   _pending_ttid_list & _critical_tid can be shared amongst partitions
-        #   created at the same time (cf Replicator.setUnfinishedTIDList).
-        #   Replicator.transactionFinished would only have to iterate on these
-        #   different sets, instead of all partitions.
-        self._offset = offset
-        self._pending_ttid_list = set(ttid_list)
-        # pending upper bound
-        self._critical_tid = max_tid
+2 parts, done sequentially:
+- Transaction (metadata) replication
+- Object (data) replication
 
-    def getOffset(self):
-        return self._offset
+Both parts follow the same mechanism:
+- The range of data to replicate is split into chunks of FETCH_COUNT items
+  (transaction or object).
+- For every chunk, the requesting node sends to seeding node the list of items
+  it already has.
+- Before answering, the seeding node sends 1 packet for every missing item.
+- The seeding node finally answers with the list of items to delete (usually
+  empty).
 
-    def getCriticalTID(self):
-        return self._critical_tid
+Replication is partial, starting from the greatest stored tid in the partition:
+- For transactions, this tid is excluded from replication.
+- For objects, this tid is included unless the storage already knows it has
+  all oids for it.
 
-    def transactionFinished(self, ttid, max_tid):
-        self._pending_ttid_list.remove(ttid)
-        assert max_tid is not None
-        # final upper bound
-        self._critical_tid = max_tid
+There is no check that item values on both nodes matches.
+
+TODO: Packing and replication currently fail when then happen at the same time.
+"""
 
-    def safe(self):
-        return not self._pending_ttid_list
+import random
 
-class Task(object):
-    """
-    A Task is a callable to execute at another time, with given parameters.
-    Execution result is kept and can be retrieved later.
-    """
+import neo.lib
+from neo.lib.protocol import CellStates, NodeTypes, NodeStates, Packets, \
+    INVALID_TID, ZERO_TID, ZERO_OID
+from neo.lib.connection import ClientConnection
+from neo.lib.util import add64, u64
+from .handlers.storage import StorageOperationHandler
 
-    _func = None
-    _args = None
-    _kw = None
-    _result = None
-    _processed = False
+FETCH_COUNT = 1000
 
-    def __init__(self, func, args=(), kw=None):
-        self._func = func
-        self._args = args
-        if kw is None:
-            kw = {}
-        self._kw = kw
 
-    def process(self):
-        if self._processed:
-            raise ValueError, 'You cannot process a single Task twice'
-        self._processed = True
-        self._result = self._func(*self._args, **self._kw)
+class Partition(object):
 
-    def getResult(self):
-        # Should we instead execute immediately rather than raising ?
-        if not self._processed:
-            raise ValueError, 'You cannot get a result until task is executed'
-        return self._result
+    __slots__ = 'next_trans', 'next_obj', 'max_ttid'
 
     def __repr__(self):
-        fmt = '<%s at %x %r(*%r, **%r)%%s>' % (self.__class__.__name__,
-            id(self), self._func, self._args, self._kw)
-        if self._processed:
-            extra = ' => %r' % (self._result, )
-        else:
-            extra = ''
-        return fmt % (extra, )
+        return '<%s(%s) at 0x%x>' % (self.__class__.__name__,
+            ', '.join('%s=%r' % (x, getattr(self, x)) for x in self.__slots__
+                                                      if hasattr(self, x)),
+            id(self))
 
 class Replicator(object):
-    """This class handles replications of objects and transactions.
-
-    Assumptions:
-
-        - Client nodes recognize partition changes reasonably quickly.
-
-        - When an out of date partition is added, next transaction ID
-          is given after the change is notified and serialized.
-
-    Procedures:
-
-        - Get the last TID right after a partition is added. This TID
-          is called a "critical TID", because this and TIDs before this
-          may not be present in this storage node yet. After a critical
-          TID, all transactions must exist in this storage node.
-
-        - Check if a primary master node still has pending transactions
-          before and at a critical TID. If so, I must wait for them to be
-          committed or aborted.
-
-        - In order to copy data, first get the list of TIDs. This is done
-          part by part, because the list can be very huge. When getting
-          a part of the list, I verify if they are in my database, and
-          ask data only for non-existing TIDs. This is performed until
-          the check reaches a critical TID.
-
-        - Next, get the list of OIDs. And, for each OID, ask the history,
-          namely, a list of serials. This is also done part by part, and
-          I ask only non-existing data. """
-
-    # new_partition_set
-    #   outdated partitions for which no pending transactions was asked to
-    #   primary master yet
-    # partition_dict
-    #   outdated partitions with pending transaction and temporary critical
-    #   tid
-    # current_partition
-    #   partition being currently synchronised
-    # current_connection
-    #   connection to a storage node we are replicating from
-    # waiting_for_unfinished_tids
-    #   unfinished tids have been asked to primary master node, but it
-    #   didn't answer yet.
-    # replication_done
-    #   False if we know there is something to replicate.
-    #   True when current_partition is replicated, or we don't know yet if
-    #   there is something to replicate
 
+    current_node = None
     current_partition = None
-    current_connection = None
-    waiting_for_unfinished_tids = False
-    replication_done = True
 
     def __init__(self, app):
         self.app = app
-        self.new_partition_set = set()
-        self.partition_dict = {}
-        self.task_list = []
-        self.task_dict = {}
-
-    def masterLost(self):
-        """
-        When connection to primary master is lost, stop waiting for unfinished
-        transactions.
-        """
-        self.waiting_for_unfinished_tids = False
 
-    def storageLost(self):
-        """
-        Restart replicating.
-        """
-        self.reset()
+    def getCurrentConnection(self):
+        node = self.current_node
+        if node is not None and node.isConnected():
+            return node.getConnection()
 
-    def populate(self):
-        """
-        Populate partitions to replicate. Must be called when partition
-        table is the one accepted by primary master.
-        Implies a reset.
-        """
-        partition_list = self.app.pt.getOutdatedOffsetListFor(self.app.uuid)
-        self.new_partition_set = set(partition_list)
-        self.partition_dict = {}
-        self.reset()
-
-    def reset(self):
-        """Reset attributes to restart replicating."""
-        self.task_list = []
-        self.task_dict = {}
-        self.current_partition = None
-        self.current_connection = None
-        self.replication_done = True
-
-    def pending(self):
-        """Return whether there is any pending partition."""
-        return bool(self.partition_dict or self.new_partition_set)
-
-    def getCurrentOffset(self):
-        assert self.current_partition is not None
-        return self.current_partition.getOffset()
-
-    def getCurrentCriticalTID(self):
-        assert self.current_partition is not None
-        return self.current_partition.getCriticalTID()
-
-    def setReplicationDone(self):
-        """ Callback from ReplicationHandler """
-        self.replication_done = True
-
-    def isCurrentConnection(self, conn):
-        return self.current_connection is conn
-
-    def setUnfinishedTIDList(self, max_tid, ttid_list):
+    def setUnfinishedTIDList(self, max_tid, ttid_list, offset_list):
         """This is a callback from MasterOperationHandler."""
-        neo.lib.logging.debug('setting unfinished TTIDs %s',
-                              ','.join(map(dump, ttid_list)))
-        # all new outdated partition must wait those ttid
-        new_partition_set = self.new_partition_set
-        while new_partition_set:
-            offset = new_partition_set.pop()
-            self.partition_dict[offset] = Partition(offset, max_tid, ttid_list)
-        self.waiting_for_unfinished_tids = False
+        if ttid_list:
+            self.ttid_set.update(ttid_list)
+            max_ttid = max(ttid_list)
+        else:
+            max_ttid = None
+        for offset in offset_list:
+            self.partition_dict[offset].max_ttid = max_ttid
+            self.replicate_dict[offset] = max_tid
+        self._nextPartition()
 
     def transactionFinished(self, ttid, max_tid):
         """ Callback from MasterOperationHandler """
-        for partition in self.partition_dict.itervalues():
-            partition.transactionFinished(ttid, max_tid)
+        self.ttid_set.remove(ttid)
+        min_ttid = min(self.ttid_set) if self.ttid_set else INVALID_TID
+        for offset, p in self.partition_dict.iteritems():
+            if p.max_ttid and p.max_ttid < min_ttid:
+                p.max_ttid = None
+                self.replicate_dict[offset] = max_tid
+        self._nextPartition()
+
+    def getBackupTID(self):
+        outdated_set = set(self.app.pt.getOutdatedOffsetListFor(self.app.uuid))
+        tid = INVALID_TID
+        for offset, p in self.partition_dict.iteritems():
+            if offset not in outdated_set:
+                tid = min(tid, p.next_trans, p.next_obj)
+        if tid not in (ZERO_TID, INVALID_TID):
+            return add64(tid, -1)
 
-    def _askUnfinishedTIDs(self):
-        conn = self.app.master_conn
-        conn.ask(Packets.AskUnfinishedTransactions())
-        self.waiting_for_unfinished_tids = True
-
-    def _startReplication(self):
-        # Choose a storage node for the source.
+    def populate(self):
         app = self.app
-        cell_list = app.pt.getCellList(self.current_partition.getOffset(),
-                                       readable=True)
-        node_list = [cell.getNode() for cell in cell_list
-                        if cell.getNodeState() == NodeStates.RUNNING]
+        pt = app.pt
+        uuid = app.uuid
+        self.partition_dict = p = {}
+        self.replicate_dict = {}
+        self.source_dict = {}
+        self.ttid_set = set()
+        last_tid, last_trans_dict, last_obj_dict = app.dm.getLastTIDs()
+        backup_tid = app.dm.getBackupTID()
+        if backup_tid and last_tid < backup_tid:
+            last_tid = backup_tid
+        outdated_list = []
+        for offset in xrange(pt.getPartitions()):
+            for cell in pt.getCellList(offset):
+                if cell.getUUID() == uuid:
+                    self.partition_dict[offset] = p = Partition()
+                    if cell.isOutOfDate():
+                        outdated_list.append(offset)
                         try:
-            node = choice(node_list)
-        except IndexError:
-            # Not operational.
-            neo.lib.logging.error('not operational', exc_info = 1)
-            self.current_partition = None
-            return
+                            p.next_trans = add64(last_trans_dict[offset], 1)
+                        except KeyError:
+                            p.next_trans = ZERO_TID
+                        p.next_obj = last_obj_dict.get(offset, ZERO_TID)
+                        p.max_ttid = INVALID_TID
+                    else:
+                        p.next_trans = p.next_obj = last_tid
+                        p.max_ttid = None
+        if outdated_list:
+            self.app.master_conn.ask(Packets.AskUnfinishedTransactions(),
+                                     offset_list=outdated_list)
 
-        addr = node.getAddress()
-        if addr is None:
-            neo.lib.logging.error("no address known for the selected node %s" %
-                    (dump(node.getUUID()), ))
+    def notifyPartitionChanges(self, cell_list):
+        """This is a callback from MasterOperationHandler."""
+        abort = False
+        added_list = []
+        app = self.app
+        for offset, uuid, state in cell_list:
+            if uuid == app.uuid:
+                if state == CellStates.DISCARDED:
+                    del self.partition_dict[offset]
+                    self.replicate_dict.pop(offset, None)
+                    self.source_dict.pop(offset, None)
+                    abort = abort or self.current_partition == offset
+                elif state == CellStates.OUT_OF_DATE:
+                    assert offset not in self.partition_dict
+                    self.partition_dict[offset] = p = Partition()
+                    p.next_trans = p.next_obj = ZERO_TID
+                    p.max_ttid = INVALID_TID
+                    added_list.append(offset)
+        if added_list:
+            self.app.master_conn.ask(Packets.AskUnfinishedTransactions(),
+                                     offset_list=added_list)
+        if abort:
+            self.abort()
+
+    def backup(self, tid, source_dict):
+        for offset in source_dict:
+            self.replicate_dict[offset] = tid
+        self.source_dict.update(source_dict)
+        self._nextPartition()
+
+    def _nextPartition(self):
+        # XXX: One connection to another storage may remain open forever.
+        #      All other previous connections are automatically closed
+        #      after some time of inactivity.
+        #      This should be improved in several ways:
+        #      - Keeping connections open between 2 clusters (backup case) is
+        #        quite a good thing because establishing a connection costs
+        #        time/bandwidth and replication is actually never finished.
+        #      - When all storages of a non-backup cluster are up-to-date,
+        #        there's no reason to keep any connection open.
+        if self.current_partition is not None or not self.replicate_dict:
             return
-
-        connection = self.current_connection
-        if connection is None or connection.getAddress() != addr:
-            handler = replication.ReplicationHandler(app)
-            self.current_connection = ClientConnection(app.em, handler,
+        app = self.app
+        # Choose a partition with no unfinished transaction if possible.
+        for offset in self.replicate_dict:
+            if not self.partition_dict[offset].max_ttid:
+                break
+        try:
+            addr, name = self.source_dict[offset]
+        except KeyError:
+            assert self.app.pt.getCell(offset, self.app.uuid).isOutOfDate()
+            node = random.choice([cell.getNode()
+                for cell in app.pt.getCellList(offset, readable=True)
+                if cell.getNodeState() == NodeStates.RUNNING])
+            name = None
+        else:
+            node = app.nm.getByAddress(addr)
+            if node is None:
+                assert name, addr
+                node = app.nm.createStorage(address=addr)
+        self.current_partition = offset
+        previous_node = self.current_node
+        self.current_node = node
+        if node.isConnected():
+            node.getConnection().asClient()
+            self.fetchTransactions()
+            if node is previous_node:
+                return
+        else:
+            assert name or node.getUUID() != app.uuid, "loopback connection"
+            conn = ClientConnection(app.em, StorageOperationHandler(app),
                 node=node, connector=app.connector_handler())
-            p = Packets.RequestIdentification(NodeTypes.STORAGE,
-                    app.uuid, app.server, app.name)
-            self.current_connection.ask(p)
-            if connection is not None:
-                connection.close()
+            conn.ask(Packets.RequestIdentification(NodeTypes.STORAGE,
+                None if name else app.uuid, app.server, name or app.name))
+        if previous_node is not None and previous_node.isConnected():
+            previous_node.getConnection().closeClient()
+
+    def fetchTransactions(self, min_tid=None):
+        offset = self.current_partition
+        p = self.partition_dict[offset]
+        if min_tid:
+            p.next_trans = min_tid
         else:
-            connection.getHandler().startReplication(connection)
-        self.replication_done = False
-
-    def _finishReplication(self):
-        # TODO: remove try..except: pass
             try:
-            # Notify to a primary master node that my cell is now up-to-date.
-            conn = self.app.master_conn
-            offset = self.current_partition.getOffset()
-            self.partition_dict.pop(offset)
-            conn.notify(Packets.NotifyReplicationDone(offset))
+                addr, name = self.source_dict[offset]
             except KeyError:
                 pass
-        if self.pending():
-            self.current_partition = None
             else:
-            self.current_connection.close()
-
-    def act(self):
-
-        if self.current_partition is not None:
-            # Don't end replication until we have received all expected
-            # answers, as we might have asked object data just before the last
-            # AnswerCheckSerialRange.
-            if self.replication_done and \
-                    not self.current_connection.isPending():
-                # finish a replication
-                neo.lib.logging.info('replication is done for %s' %
-                        (self.current_partition.getOffset(), ))
-                self._finishReplication()
-            return
-
-        if self.waiting_for_unfinished_tids:
-            # Still waiting.
-            neo.lib.logging.debug('waiting for unfinished tids')
+                if addr != self.current_node.getAddress():
+                    return self.abort()
+            min_tid = p.next_trans
+            self.replicate_tid = self.replicate_dict.pop(offset)
+            neo.lib.logging.debug("starting replication of <partition=%u"
+                " min_tid=%u max_tid=%u> from %r", offset, u64(min_tid),
+                u64(self.replicate_tid), self.current_node)
+        max_tid = self.replicate_tid
+        tid_list = self.app.dm.getReplicationTIDList(min_tid, max_tid,
+            FETCH_COUNT, offset)
+        self.current_node.getConnection().ask(Packets.AskFetchTransactions(
+            offset, FETCH_COUNT, min_tid, max_tid, tid_list))
+
+    def fetchObjects(self, min_tid=None, min_oid=ZERO_OID):
+        offset = self.current_partition
+        p = self.partition_dict[offset]
+        max_tid = self.replicate_tid
+        if min_tid:
+            if p.next_obj < self.next_backup_tid:
+                self.app.dm.setBackupTID(min_tid)
+        else:
+            min_tid = p.next_obj
+            p.next_trans = p.next_obj = add64(max_tid, 1)
+            if self.app.dm.getBackupTID() is None or \
+               self.app.pt.getCell(offset, self.app.uuid).isOutOfDate():
+                self.next_backup_tid = ZERO_TID
+            else:
+                self.next_backup_tid = self.getBackupTID()
+        p.next_obj = min_tid
+        object_dict = {}
+        for serial, oid in self.app.dm.getReplicationObjectList(min_tid,
+                max_tid, FETCH_COUNT, offset, min_oid):
+            try:
+                object_dict[serial].append(oid)
+            except KeyError:
+                object_dict[serial] = [oid]
+        self.current_node.getConnection().ask(Packets.AskFetchObjects(
+            offset, FETCH_COUNT, min_tid, max_tid, min_oid, object_dict))
+
+    def finish(self):
+        offset = self.current_partition
+        tid = self.replicate_tid
+        del self.current_partition, self.replicate_tid, self.next_backup_tid
+        p = self.partition_dict[offset]
+        p.next_obj = add64(tid, 1)
+        self.app.dm.setBackupTID(self.getBackupTID())
+        if not p.max_ttid:
+            p = Packets.NotifyReplicationDone(offset, tid)
+            self.app.master_conn.notify(p)
+        neo.lib.logging.debug("partition %u replicated up to %u from %r",
+                              offset, u64(tid), self.current_node)
+        self._nextPartition()
+
+    def abort(self, message=''):
+        offset = self.current_partition
+        if offset is None:
             return
-
-        if self.new_partition_set:
-            # Ask pending transactions.
-            neo.lib.logging.debug('asking unfinished tids')
-            self._askUnfinishedTIDs()
+        del self.current_partition
+        neo.lib.logging.warning('replication aborted for partition %u%s',
+                                offset, message and ' (%s)' % message)
+        if self.app.master_node is None:
             return
-
-        # Try to select something.
-        for partition in self.partition_dict.values():
-            # XXX: replication could start up to the initial critical tid, that
-            # is below the pending transactions, then finish when all pending
-            # transactions are committed.
-            if partition.safe():
-                self.current_partition = partition
-                break
+        if offset in self.partition_dict:
+            # XXX: Try another partition if possible, to increase probability to
+            #      connect to another node. It would be better to explicitely
+            #      search for another node instead.
+            tid = self.replicate_dict.pop(offset, None) or self.replicate_tid
+            if self.replicate_dict:
+                self._nextPartition()
+                self.replicate_dict[offset] = tid
             else:
-            # Not yet.
-            neo.lib.logging.debug('not ready yet')
-            return
-
-        self._startReplication()
-
-    def removePartition(self, offset):
-        """This is a callback from MasterOperationHandler."""
-        self.partition_dict.pop(offset, None)
-        self.new_partition_set.discard(offset)
-
-    def addPartition(self, offset):
-        """This is a callback from MasterOperationHandler."""
-        if not self.partition_dict.has_key(offset):
-            self.new_partition_set.add(offset)
-
-    def _addTask(self, key, func, args=(), kw=None):
-        task = Task(func, args, kw)
-        task_dict = self.task_dict
-        if key in task_dict:
-            raise ValueError, 'Task with key %r already exists (%r), cannot ' \
-                'add %r' % (key, task_dict[key], task)
-        task_dict[key] = task
-        self.task_list.append(task)
-
-    def processDelayedTasks(self):
-        task_list = self.task_list
-        if task_list:
-            for task in task_list:
-                task.process()
-            self.task_list = []
-
-    def checkTIDRange(self, min_tid, max_tid, length, partition):
-        self._addTask(('TID', min_tid, length),
-            self.app.dm.checkTIDRange, (min_tid, max_tid, length, partition))
-
-    def checkSerialRange(self, min_oid, min_serial, max_tid, length,
-            partition):
-        self._addTask(('Serial', min_oid, min_serial, length),
-            self.app.dm.checkSerialRange, (min_oid, min_serial, max_tid, length,
-            partition))
-
-    def getTIDsFrom(self, min_tid, max_tid, length, partition):
-        self._addTask('TIDsFrom', self.app.dm.getReplicationTIDList,
-            (min_tid, max_tid, length, partition))
-
-    def getObjectHistoryFrom(self, min_oid, min_serial, max_serial, length,
-            partition):
-        self._addTask('ObjectHistoryFrom', self.app.dm.getObjectHistoryFrom,
-            (min_oid, min_serial, max_serial, length, partition))
-
-    def _getCheckResult(self, key):
-        return self.task_dict.pop(key).getResult()
-
-    def getTIDCheckResult(self, min_tid, length):
-        return self._getCheckResult(('TID', min_tid, length))
-
-    def getSerialCheckResult(self, min_oid, min_serial, length):
-        return self._getCheckResult(('Serial', min_oid, min_serial, length))
-
-    def getTIDsFromResult(self):
-        return self._getCheckResult('TIDsFrom')
-
-    def getObjectHistoryFromResult(self):
-        return self._getCheckResult('ObjectHistoryFrom')
-
+                self.replicate_dict[offset] = tid
+                self._nextPartition()
+        else: # partition removed
+            self._nextPartition()

neo/tests/__init__.py

@@ -131,6 +131,11 @@ class NeoTestBase(unittest.TestCase):
         sys.stdout.write('\n')
         sys.stdout.flush()
 
+    class failureException(AssertionError):
+        def __init__(self, msg=None):
+            neo.lib.logging.error(msg)
+            AssertionError.__init__(self, msg)
+
     failIfEqual = failUnlessEqual = assertEquals = assertNotEquals = None
 
     def assertNotEqual(self, first, second, msg=None):

neo/tests/functional/__init__.py

@@ -25,6 +25,7 @@ import signal
 import random
 import weakref
 import MySQLdb
+import sqlite3
 import unittest
 import tempfile
 import traceback
@@ -242,9 +243,15 @@ class NEOCluster(object):
         self.cleanup_on_delete = cleanup_on_delete
         self.verbose = verbose
         self.uuid_set = set()
+        self.db_list = db_list
+        if adapter == 'MySQL':
             self.db_user = db_user
             self.db_password = db_password
-        self.db_list = db_list
+            self.db_template = '%s:%s@%%s' % (db_user, db_password)
+        elif adapter == 'SQLite':
+            self.db_template = os.path.join(temp_dir, '%s.sqlite')
+        else:
+            assert False, adapter
         self.address_type = address_type
         self.local_ip = local_ip = IP_VERSION_FORMAT_DICT[self.address_type]
         self.setupDB(clear_databases)
@@ -290,7 +297,7 @@ class NEOCluster(object):
                                         self.local_ip),
                                         0 ),
                 '--masters': self.master_nodes,
-                '--database': '%s:%s@%s' % (db_user, db_password, db),
+                '--database': self.db_template % db,
                 '--adapter': adapter,
             })
         # create neoctl
@@ -316,6 +323,17 @@ class NEOCluster(object):
         if self.adapter == 'MySQL':
             setupMySQLdb(self.db_list, self.db_user, self.db_password,
                          clear_databases)
+        elif self.adapter == 'SQLite':
+            if clear_databases:
+                for db in self.db_list:
+                    try:
+                        os.remove(self.db_template % db)
+                    except OSError, e:
+                        if e.errno != errno.ENOENT:
+                            raise
+                    else:
+                        neo.lib.logging.debug('%r deleted',
+                                              db_template % db)
 
     def run(self, except_storages=()):
         """ Start cluster processes except some storage nodes """
@@ -402,11 +420,14 @@ class NEOCluster(object):
         db = ZODB.DB(storage=self.getZODBStorage(**kw))
         return (db, db.open())
 
-    def getSQLConnection(self, db, autocommit=False):
+    def getSQLConnection(self, db):
         assert db in self.db_list
+        if self.adapter == 'MySQL':
             conn = MySQLdb.Connect(user=self.db_user, passwd=self.db_password,
                                    db=db)
-        conn.autocommit(autocommit)
+            conn.autocommit(True)
+        elif self.adapter == 'SQLite':
+            conn = sqlite3.connect(self.db_template % db, isolation_level=None)
         return conn
 
     def _getProcessList(self, type):

neo/tests/functional/testClient.py

@@ -234,6 +234,9 @@ class ClientTests(NEOFunctionalTest):
                 temp_dir=self.getTempDirectory())
             neoctl = self.neo.getNEOCTL()
             self.neo.start()
+            # BUG: The following 2 lines creates 2 app, i.e. 2 TCP connections
+            #      to the storage, so there may be a race condition at network
+            #      level and 'st2.store' may be effective before 'st1.store'.
             db1, conn1 = self.neo.getZODBConnection()
             db2, conn2 = self.neo.getZODBConnection()
             st1, st2 = conn1._storage, conn2._storage

neo/tests/functional/testCluster.py

@@ -35,7 +35,7 @@ class ClusterTests(NEOFunctionalTest):
 
     def testClusterStartup(self):
         neo = NEOCluster(['test_neo1', 'test_neo2'], replicas=1,
-            adapter='MySQL', temp_dir=self.getTempDirectory())
+                         temp_dir=self.getTempDirectory())
         neoctl = neo.getNEOCTL()
         neo.run()
         # Runing a new cluster doesn't exit Recovery state.

neo/tests/functional/testStorage.py

@@ -23,7 +23,7 @@ from persistent import Persistent
 from . import NEOCluster, NEOFunctionalTest
 from neo.lib.protocol import ClusterStates, NodeStates
 from ZODB.tests.StorageTestBase import zodb_pickle
-from MySQLdb import ProgrammingError
+import MySQLdb, sqlite3
 from MySQLdb.constants.ER import NO_SUCH_TABLE
 
 class PObject(Persistent):
@@ -46,9 +46,11 @@ class StorageTests(NEOFunctionalTest):
         NEOFunctionalTest.tearDown(self)
 
     def queryCount(self, db, query):
+        try:
             db.query(query)
-        result = db.store_result().fetch_row()[0][0]
-        return result
+        except AttributeError:
+            return db.execute(query).fetchone()[0]
+        return db.store_result().fetch_row()[0][0]
 
     def __setup(self, storage_number=2, pending_number=0, replicas=1,
             partitions=10, master_count=2):
@@ -58,7 +60,6 @@ class StorageTests(NEOFunctionalTest):
             partitions=partitions, replicas=replicas,
             temp_dir=self.getTempDirectory(),
             clear_databases=True,
-            adapter='MySQL',
         )
         # too many pending storage nodes requested
         assert pending_number <= storage_number
@@ -80,7 +81,7 @@ class StorageTests(NEOFunctionalTest):
         db.close()
 
     def __checkDatabase(self, db_name):
-        db = self.neo.getSQLConnection(db_name, autocommit=True)
+        db = self.neo.getSQLConnection(db_name)
         # wait for the sql transaction to be commited
         def callback(last_try):
             object_number = self.queryCount(db, 'select count(*) from obj')
@@ -124,13 +125,16 @@ class StorageTests(NEOFunctionalTest):
     def __checkReplicateCount(self, db_name, target_count, timeout=0, delay=1):
         db = self.neo.getSQLConnection(db_name, autocommit=True)
         def callback(last_try):
+            replicate_count = 0
             try:
                 replicate_count = self.queryCount(db,
                     'select count(distinct uuid) from pt')
-            except ProgrammingError, exc:
-                if exc[0] != NO_SUCH_TABLE:
+            except MySQLdb.ProgrammingError, e:
+                if e[0] != NO_SUCH_TABLE:
+                    raise
+            except sqlite3.OperationalError, e:
+                if not e[0].startswith('no such table:'):
                     raise
-                replicate_count = 0
             if last_try is not None and last_try < replicate_count:
                 raise AssertionError, 'Regression: %s became %s' % \
                     (last_try, replicate_count)

neo/tests/master/testRecovery.py

@@ -85,7 +85,7 @@ class MasterRecoveryTests(NeoUnitTestBase):
         self.assertTrue(ptid2 > self.app.pt.getID())
         self.assertTrue(oid2 > self.app.tm.getLastOID())
         self.assertTrue(tid2 > self.app.tm.getLastTID())
-        recovery.answerLastIDs(conn, oid2, tid2, ptid2)
+        recovery.answerLastIDs(conn, oid2, tid2, ptid2, None)
         self.assertEqual(oid2, self.app.tm.getLastOID())
         self.assertEqual(tid2, self.app.tm.getLastTID())
         self.assertEqual(ptid2, recovery.target_ptid)

neo/tests/master/testStorageHandler.py

@@ -130,10 +130,11 @@ class MasterStorageHandlerTests(NeoUnitTestBase):
         self.app.tm.setLastTID(tid)
         service.askLastIDs(conn)
         packet = self.checkAnswerLastIDs(conn)
-        loid, ltid, lptid = packet.decode()
+        loid, ltid, lptid, backup_tid = packet.decode()
         self.assertEqual(loid, oid)
         self.assertEqual(ltid, tid)
         self.assertEqual(lptid, ptid)
+        self.assertEqual(backup_tid, None)
 
     def test_13_askUnfinishedTransactions(self):
         service = self.service

neo/tests/stat_zodb.py

@@ -3,7 +3,7 @@
 import math, os, random, sys, time
 from cStringIO import StringIO
 from persistent.TimeStamp import TimeStamp
-from ZODB.utils import p64, newTid
+from ZODB.utils import p64, u64
 from ZODB.BaseStorage import TransactionRecord
 from ZODB.FileStorage import FileStorage
 
@@ -44,6 +44,7 @@ class DummyZODB(object):
         self.new_ratio = new_ratio
         self.next_oid = 0
         self.err_count = 0
+        self.tid = u64('TID\0\0\0\0\0')
 
     def __call__(self):
         variate = self.random.lognormvariate
@@ -63,9 +64,11 @@ class DummyZODB(object):
             yield p64(oid), int(round(variate(self.obj_size_mu,
                                               self.obj_size_sigma))) or 1
 
-    def as_storage(self, transaction_count, dummy_data_file=None):
+    def as_storage(self, stop, dummy_data_file=None):
         if dummy_data_file is None:
             dummy_data_file = DummyData(self.random)
+        if isinstance(stop, int):
+            stop = (lambda x: lambda y: x <= y)(stop)
         class dummy_change(object):
             data_txn = None
             version = ''
@@ -97,12 +100,14 @@ class DummyZODB(object):
             size = 0
             def iterator(storage, *args):
                 args = ' ', '', '', {}
-                tid = None
-                for i in xrange(1, transaction_count+1):
-                    tid = newTid(tid)
-                    t =  dummy_transaction(tid, *args)
+                i = 0
+                variate = self.random.lognormvariate
+                while not stop(i):
+                    self.tid += max(1, int(variate(10, 3)))
+                    t =  dummy_transaction(p64(self.tid), *args)
                     storage.size += t.size
                     yield t
+                    i += 1
             def getSize(self):
                 return self.size
         return dummy_storage()

neo/tests/storage/testMasterHandler.py

@@ -164,19 +164,6 @@ class StorageMasterHandlerTests(NeoUnitTestBase):
         calls[0].checkArgs(tid)
         self.checkNoPacketSent(conn)
 
-    def test_31_answerUnfinishedTransactions(self):
-        # set unfinished TID on replicator
-        conn = self.getFakeConnection()
-        self.app.replicator = Mock()
-        self.operation.answerUnfinishedTransactions(
-            conn=conn,
-            max_tid=INVALID_TID,
-            ttid_list=(INVALID_TID, ),
-        )
-        calls = self.app.replicator.mockGetNamedCalls('setUnfinishedTIDList')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(INVALID_TID, (INVALID_TID, ))
-
     def test_askPack(self):
         self.app.dm = Mock({'pack': None})
         conn = self.getFakeConnection()

neo/tests/storage/testReplication.py

-#
-# Copyright (C) 2010  Nexedi SA
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-
-import unittest
-from mock import Mock
-from struct import pack
-from collections import deque
-
-from .. import NeoUnitTestBase
-from neo.storage.database import buildDatabaseManager
-from neo.storage.handlers.replication import ReplicationHandler
-from neo.storage.handlers.replication import RANGE_LENGTH
-from neo.storage.handlers.storage import StorageOperationHandler
-from neo.storage.replicator import Replicator
-from neo.lib.protocol import ZERO_OID, ZERO_TID
-
-MAX_TRANSACTIONS = 10000
-MAX_OBJECTS = 100000
-MAX_TID = '\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFE' # != INVALID_TID
-
-class FakeConnection(object):
-
-    def __init__(self):
-        self._msg_id = 0
-        self._queue = deque()
-
-    def allocateId(self):
-        self._msg_id += 1
-        return self._msg_id
-
-    def _addPacket(self, packet, *args, **kw):
-        packet.setId(self.allocateId())
-        self._queue.append(packet)
-    ask = _addPacket
-    answer = _addPacket
-    notify = _addPacket
-
-    def setPeerId(self, msg_id):
-        pass
-
-    def process(self, dhandler, dconn):
-        if not self._queue:
-            return False
-        while self._queue:
-            dhandler.dispatch(dconn, self._queue.popleft())
-        return True
-
-class ReplicationTests(NeoUnitTestBase):
-
-    def checkReplicationProcess(self, reference, outdated):
-        pt = Mock({'getPartitions': 1})
-        # reference application
-        rapp = Mock({})
-        rapp.pt = pt
-        rapp.dm = reference
-        rapp.tm = Mock({'loadLocked': False})
-        mconn = FakeConnection()
-        rapp.master_conn = mconn
-        # outdated application
-        oapp = Mock({})
-        oapp.dm = outdated
-        oapp.pt = pt
-        oapp.master_conn = mconn
-        oapp.replicator = Replicator(oapp)
-        oapp.replicator.getCurrentOffset = lambda: 0
-        oapp.replicator.isCurrentConnection = lambda c: True
-        oapp.replicator.getCurrentCriticalTID = lambda: MAX_TID
-        # handlers and connections
-        rhandler = StorageOperationHandler(rapp)
-        rconn = FakeConnection()
-        ohandler = ReplicationHandler(oapp)
-        oconn = FakeConnection()
-        # run replication
-        ohandler.startReplication(oconn)
-        process = True
-        while process:
-            process = oconn.process(rhandler, rconn)
-            oapp.replicator.processDelayedTasks()
-            process |= rconn.process(ohandler, oconn)
-        # check transactions
-        for tid in reference.getTIDList(0, MAX_TRANSACTIONS, [0]):
-            self.assertEqual(
-                reference.getTransaction(tid),
-                outdated.getTransaction(tid),
-            )
-        for tid in outdated.getTIDList(0, MAX_TRANSACTIONS, [0]):
-            self.assertEqual(
-                outdated.getTransaction(tid),
-                reference.getTransaction(tid),
-            )
-        # check transactions
-        params = ZERO_TID, '\xFF' * 8, MAX_TRANSACTIONS, 0
-        self.assertEqual(
-            reference.getReplicationTIDList(*params),
-            outdated.getReplicationTIDList(*params),
-        )
-        # check objects
-        params = ZERO_OID, ZERO_TID, '\xFF' * 8, MAX_OBJECTS, 0
-        self.assertEqual(
-            reference.getObjectHistoryFrom(*params),
-            outdated.getObjectHistoryFrom(*params),
-        )
-
-    def buildStorage(self, transactions, objects, name='BTree', database=None):
-        def makeid(oid_or_tid):
-            return pack('!Q', oid_or_tid)
-        storage = buildDatabaseManager(name, (database, 0))
-        storage.setup(reset=True)
-        storage.setNumPartitions(1)
-        storage._transactions = transactions
-        storage._objects = objects
-        # store transactions
-        for tid in transactions:
-            transaction = ([ZERO_OID], 'user', 'desc', '', False)
-            storage.storeTransaction(makeid(tid), [], transaction, False)
-        # store object history
-        H = "0" * 20
-        storage.storeData(H, '', 0)
-        storage.unlockData((H,))
-        for tid, oid_list in objects.iteritems():
-            object_list = [(makeid(oid), H, None) for oid in oid_list]
-            storage.storeTransaction(makeid(tid), object_list, None, False)
-        return storage
-
-    def testReplication0(self):
-        self.checkReplicationProcess(
-            reference=self.buildStorage(
-                transactions=[1, 2, 3],
-                objects={1: [1], 2: [1], 3: [1]},
-            ),
-            outdated=self.buildStorage(
-                transactions=[],
-                objects={},
-            ),
-        )
-
-    def testReplication1(self):
-        self.checkReplicationProcess(
-            reference=self.buildStorage(
-                transactions=[1, 2, 3],
-                objects={1: [1], 2: [1], 3: [1]},
-            ),
-            outdated=self.buildStorage(
-                transactions=[1],
-                objects={1: [1]},
-            ),
-        )
-
-    def testReplication2(self):
-        self.checkReplicationProcess(
-            reference=self.buildStorage(
-                transactions=[1, 2, 3],
-                objects={1: [1, 2, 3]},
-            ),
-            outdated=self.buildStorage(
-                transactions=[1, 2, 3],
-                objects={1: [1, 2, 3]},
-            ),
-        )
-
-    def testChunkBeginning(self):
-        ref_number = range(RANGE_LENGTH + 1)
-        out_number = range(RANGE_LENGTH)
-        obj_list = [1, 2, 3]
-        self.checkReplicationProcess(
-            reference=self.buildStorage(
-                transactions=ref_number,
-                objects=dict.fromkeys(ref_number, obj_list),
-            ),
-            outdated=self.buildStorage(
-                transactions=out_number,
-                objects=dict.fromkeys(out_number, obj_list),
-            ),
-        )
-
-    def testChunkEnd(self):
-        ref_number = range(RANGE_LENGTH)
-        out_number = range(RANGE_LENGTH - 1)
-        obj_list = [1, 2, 3]
-        self.checkReplicationProcess(
-            reference=self.buildStorage(
-                transactions=ref_number,
-                objects=dict.fromkeys(ref_number, obj_list)
-            ),
-            outdated=self.buildStorage(
-                transactions=out_number,
-                objects=dict.fromkeys(out_number, obj_list)
-            ),
-        )
-
-    def testChunkMiddle(self):
-        obj_list = [1, 2, 3]
-        ref_number = range(RANGE_LENGTH)
-        out_number = range(4000)
-        out_number.remove(3000)
-        self.checkReplicationProcess(
-            reference=self.buildStorage(
-                transactions=ref_number,
-                objects=dict.fromkeys(ref_number, obj_list)
-            ),
-            outdated=self.buildStorage(
-                transactions=out_number,
-                objects=dict.fromkeys(out_number, obj_list)
-            ),
-        )
-
-    def testFullChunkPart(self):
-        obj_list = [1, 2, 3]
-        ref_number = range(1001)
-        out_number = {}
-        self.checkReplicationProcess(
-            reference=self.buildStorage(
-                transactions=ref_number,
-                objects=dict.fromkeys(ref_number, obj_list)
-            ),
-            outdated=self.buildStorage(
-                transactions=out_number,
-                objects=dict.fromkeys(out_number, obj_list)
-            ),
-        )
-
-    def testSameData(self):
-        obj_list = [1, 2, 3]
-        number = range(RANGE_LENGTH * 2)
-        self.checkReplicationProcess(
-            reference=self.buildStorage(
-                transactions=number,
-                objects=dict.fromkeys(number, obj_list)
-            ),
-            outdated=self.buildStorage(
-                transactions=number,
-                objects=dict.fromkeys(number, obj_list)
-            ),
-        )
-
-    def testTooManyData(self):
-        obj_list = [0, 1]
-        ref_number = range(RANGE_LENGTH)
-        out_number = range(RANGE_LENGTH + 2)
-        self.checkReplicationProcess(
-            reference=self.buildStorage(
-                transactions=ref_number,
-                objects=dict.fromkeys(ref_number, obj_list)
-            ),
-            outdated=self.buildStorage(
-                transactions=out_number,
-                objects=dict.fromkeys(out_number, obj_list)
-            ),
-        )
-
-    def testMissingObject(self):
-        self.checkReplicationProcess(
-            reference=self.buildStorage(
-                transactions=[1, 2],
-                objects=dict.fromkeys([1, 2], [1, 2]),
-            ),
-            outdated=self.buildStorage(
-                transactions=[1, 2],
-                objects=dict.fromkeys([1], [1]),
-            ),
-        )
-
-if __name__ == "__main__":
-    unittest.main()

neo/tests/storage/testReplicationHandler.py

-#
-# Copyright (C) 2010  Nexedi SA
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-
-import unittest
-from mock import Mock
-from neo.lib.util import add64
-from .. import NeoUnitTestBase
-from neo.lib.protocol import Packets, ZERO_OID, ZERO_TID
-from neo.storage.handlers.replication import ReplicationHandler
-from neo.storage.handlers.replication import RANGE_LENGTH, MIN_RANGE_LENGTH
-
-class FakeDict(object):
-    def __init__(self, items):
-        self._items = items
-        self._dict = dict(items)
-        assert len(self._dict) == len(items), self._dict
-
-    def iteritems(self):
-        for item in self._items:
-            yield item
-
-    def iterkeys(self):
-        for key, value in self.iteritems():
-            yield key
-
-    def itervalues(self):
-        for key, value in self.iteritems():
-            yield value
-
-    def items(self):
-        return self._items[:]
-
-    def keys(self):
-        return [x for x, y in self._items]
-
-    def values(self):
-        return [y for x, y in self._items]
-
-    def __getitem__(self, key):
-        return self._dict[key]
-
-    def __getattr__(self, key):
-        return getattr(self._dict, key)
-
-    def __len__(self):
-        return len(self._dict)
-
-class StorageReplicationHandlerTests(NeoUnitTestBase):
-
-    def setup(self):
-        pass
-
-    def teardown(self):
-        pass
-
-    def getApp(self, conn=None, tid_check_result=(0, 0, ZERO_TID),
-                serial_check_result=(0, 0, ZERO_OID, 0, ZERO_TID),
-                tid_result=(),
-                history_result=None,
-                rid=0, critical_tid=ZERO_TID,
-                num_partitions=1,
-            ):
-        if history_result is None:
-            history_result = {}
-        replicator = Mock({
-            '__repr__': 'Fake replicator',
-            'reset': None,
-            'checkSerialRange': None,
-            'checkTIDRange': None,
-            'getTIDCheckResult': tid_check_result,
-            'getSerialCheckResult': serial_check_result,
-            'getTIDsFromResult': tid_result,
-            'getObjectHistoryFromResult': history_result,
-            'checkSerialRange': None,
-            'checkTIDRange': None,
-            'getTIDsFrom': None,
-            'getObjectHistoryFrom': None,
-            'getCurrentOffset': rid,
-            'getCurrentCriticalTID': critical_tid,
-        })
-        def isCurrentConnection(other_conn):
-            return other_conn is conn
-        replicator.isCurrentConnection = isCurrentConnection
-        real_replicator = replicator
-        class FakeApp(object):
-            replicator = real_replicator
-            dm = Mock({
-                'storeTransaction': None,
-                'deleteObject': None,
-            })
-            pt = Mock({
-                'getPartitions': num_partitions,
-            })
-        return FakeApp
-
-    def _checkReplicationStarted(self, conn, rid, replicator):
-        min_tid, max_tid, length, partition = self.checkAskPacket(conn,
-            Packets.AskCheckTIDRange, decode=True)
-        self.assertEqual(min_tid, ZERO_TID)
-        self.assertEqual(length, RANGE_LENGTH)
-        self.assertEqual(partition, rid)
-        calls = replicator.mockGetNamedCalls('checkTIDRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(min_tid, max_tid, length, partition)
-
-    def _checkPacketTIDList(self, conn, tid_list, next_tid, app):
-        packet_list = [x.getParam(0) for x in conn.mockGetNamedCalls('ask')]
-        packet_list, next_range = packet_list[:-1], packet_list[-1]
-
-        self.assertEqual(type(next_range), Packets.AskCheckTIDRange)
-        pmin_tid, plength, ppartition = next_range.decode()
-        self.assertEqual(pmin_tid, add64(next_tid, 1))
-        self.assertEqual(plength, RANGE_LENGTH)
-        self.assertEqual(ppartition, app.replicator.getCurrentOffset())
-        calls = app.replicator.mockGetNamedCalls('checkTIDRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_tid, plength, ppartition)
-
-        self.assertEqual(len(packet_list), len(tid_list))
-        for packet in packet_list:
-            self.assertEqual(type(packet),
-                Packets.AskTransactionInformation)
-            ptid = packet.decode()[0]
-            for tid in tid_list:
-                if ptid == tid:
-                    tid_list.remove(tid)
-                    break
-            else:
-                raise AssertionFailed('%s not found in %r'
-                                      % (dump(ptid), map(dump, tid_list)))
-
-    def _checkPacketSerialList(self, conn, object_list, next_oid, next_serial, app):
-        packet_list = [x.getParam(0) for x in conn.mockGetNamedCalls('ask')]
-        packet_list, next_range = packet_list[:-1], packet_list[-1]
-
-        self.assertEqual(type(next_range), Packets.AskCheckSerialRange)
-        pmin_oid, pmin_serial, plength, ppartition = next_range.decode()
-        self.assertEqual(pmin_oid, next_oid)
-        self.assertEqual(pmin_serial, add64(next_serial, 1))
-        self.assertEqual(plength, RANGE_LENGTH)
-        self.assertEqual(ppartition, app.replicator.getCurrentOffset())
-        calls = app.replicator.mockGetNamedCalls('checkSerialRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_oid, pmin_serial, plength, ppartition)
-
-        self.assertEqual(len(packet_list), len(object_list),
-            ([x.decode() for x in packet_list], object_list))
-        reference_set = set((x + (None, ) for x in object_list))
-        packet_set = set((x.decode() for x in packet_list))
-        assert len(packet_list) == len(reference_set) == len(packet_set)
-        self.assertEqual(reference_set, packet_set)
-
-    def test_connectionLost(self):
-        app = self.getApp()
-        ReplicationHandler(app).connectionLost(None, None)
-        self.assertEqual(len(app.replicator.mockGetNamedCalls('storageLost')), 1)
-
-    def test_connectionFailed(self):
-        app = self.getApp()
-        ReplicationHandler(app).connectionFailed(None)
-        self.assertEqual(len(app.replicator.mockGetNamedCalls('storageLost')), 1)
-
-    def test_acceptIdentification(self):
-        rid = 24
-        app = self.getApp(rid=rid)
-        conn = self.getFakeConnection()
-        replication = ReplicationHandler(app)
-        replication.acceptIdentification(conn, None, None, None,
-            None, None)
-        self._checkReplicationStarted(conn, rid, app.replicator)
-
-    def test_startReplication(self):
-        rid = 24
-        app = self.getApp(rid=rid)
-        conn = self.getFakeConnection()
-        ReplicationHandler(app).startReplication(conn)
-        self._checkReplicationStarted(conn, rid, app.replicator)
-
-    def test_answerTIDsFrom(self):
-        conn = self.getFakeConnection()
-        tid_list = [self.getOID(0), self.getOID(1), self.getOID(2)]
-        app = self.getApp(conn=conn, tid_result=[])
-        # With no known TID
-        ReplicationHandler(app).answerTIDsFrom(conn, tid_list)
-        # With some TIDs known
-        conn = self.getFakeConnection()
-        known_tid_list = [tid_list[0], tid_list[1]]
-        unknown_tid_list = [tid_list[2], ]
-        app = self.getApp(conn=conn, tid_result=known_tid_list)
-        ReplicationHandler(app).answerTIDsFrom(conn, tid_list[1:])
-        calls = app.dm.mockGetNamedCalls('deleteTransaction')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(tid_list[0])
-
-    def test_answerTransactionInformation(self):
-        conn = self.getFakeConnection()
-        app = self.getApp(conn=conn)
-        tid = self.getNextTID()
-        user = 'foo'
-        desc = 'bar'
-        ext = 'baz'
-        packed = True
-        oid_list = [self.getOID(1), self.getOID(2)]
-        ReplicationHandler(app).answerTransactionInformation(conn, tid, user,
-            desc, ext, packed, oid_list)
-        calls = app.dm.mockGetNamedCalls('storeTransaction')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(tid, (), (oid_list, user, desc, ext, packed), False)
-
-    def test_answerObjectHistoryFrom(self):
-        conn = self.getFakeConnection()
-        oid_1 = self.getOID(1)
-        oid_2 = self.getOID(2)
-        oid_3 = self.getOID(3)
-        oid_4 = self.getOID(4)
-        oid_5 = self.getOID(5)
-        tid_list = map(self.getOID, xrange(7))
-        oid_dict = FakeDict((
-            (oid_1, [tid_list[0], tid_list[1]]),
-            (oid_2, [tid_list[2], tid_list[3]]),
-            (oid_4, [tid_list[5]]),
-        ))
-        flat_oid_list = []
-        for oid, serial_list in oid_dict.iteritems():
-            for serial in serial_list:
-                flat_oid_list.append((oid, serial))
-        app = self.getApp(conn=conn, history_result={})
-        # With no known OID/Serial
-        ReplicationHandler(app).answerObjectHistoryFrom(conn, oid_dict)
-        # With some known OID/Serials
-        # For test to be realist, history_result should contain the same
-        # number of serials as oid_dict, otherise it just tests the special
-        # case of the last check in a partition.
-        conn = self.getFakeConnection()
-        app = self.getApp(conn=conn, history_result={
-            oid_1: [oid_dict[oid_1][0], ],
-            oid_3: [tid_list[2]],
-            oid_4: [tid_list[4], oid_dict[oid_4][0], tid_list[6]],
-            oid_5: [tid_list[6]],
-        })
-        ReplicationHandler(app).answerObjectHistoryFrom(conn, oid_dict)
-        calls = app.dm.mockGetNamedCalls('deleteObject')
-        actual_deletes = set(((x.getParam(0), x.getParam(1)) for x in calls))
-        expected_deletes = set((
-            (oid_3, tid_list[2]),
-            (oid_4, tid_list[4]),
-        ))
-        self.assertEqual(actual_deletes, expected_deletes)
-
-    def test_answerObject(self):
-        conn = self.getFakeConnection()
-        app = self.getApp(conn=conn)
-        oid = self.getOID(1)
-        serial_start = self.getNextTID()
-        serial_end = self.getNextTID()
-        compression = 1
-        checksum = "0" * 20
-        data = 'foo'
-        data_serial = None
-        app.dm.mockAddReturnValues(storeData=checksum)
-        ReplicationHandler(app).answerObject(conn, oid, serial_start,
-            serial_end, compression, checksum, data, data_serial)
-        calls = app.dm.mockGetNamedCalls('storeTransaction')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(serial_start, [(oid, checksum, data_serial)],
-            None, False)
-
-    # CheckTIDRange
-    def test_answerCheckTIDFullRangeIdenticalChunkWithNext(self):
-        min_tid = self.getNextTID()
-        max_tid = self.getNextTID()
-        critical_tid = self.getNextTID()
-        assert max_tid < critical_tid
-        length = RANGE_LENGTH
-        rid = 12
-        conn = self.getFakeConnection()
-        app = self.getApp(tid_check_result=(length, 0, max_tid), rid=rid,
-            conn=conn, critical_tid=critical_tid)
-        handler = ReplicationHandler(app)
-        # Peer has the same data as we have: length, checksum and max_tid
-        # match.
-        handler.answerCheckTIDRange(conn, min_tid, length, length, 0, max_tid)
-        # Result: go on with next chunk
-        pmin_tid, pmax_tid, plength, ppartition = self.checkAskPacket(conn,
-            Packets.AskCheckTIDRange, decode=True)
-        self.assertEqual(pmin_tid, add64(max_tid, 1))
-        self.assertEqual(plength, RANGE_LENGTH)
-        self.assertEqual(ppartition, rid)
-        calls = app.replicator.mockGetNamedCalls('checkTIDRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_tid, pmax_tid, plength, ppartition)
-
-    def test_answerCheckTIDSmallRangeIdenticalChunkWithNext(self):
-        min_tid = self.getNextTID()
-        max_tid = self.getNextTID()
-        critical_tid = self.getNextTID()
-        assert max_tid < critical_tid
-        length = RANGE_LENGTH / 2
-        rid = 12
-        conn = self.getFakeConnection()
-        app = self.getApp(tid_check_result=(length, 0, max_tid), rid=rid,
-            conn=conn, critical_tid=critical_tid)
-        handler = ReplicationHandler(app)
-        # Peer has the same data as we have: length, checksum and max_tid
-        # match.
-        handler.answerCheckTIDRange(conn, min_tid, length, length, 0, max_tid)
-        # Result: go on with next chunk
-        pmin_tid, pmax_tid, plength, ppartition = self.checkAskPacket(conn,
-            Packets.AskCheckTIDRange, decode=True)
-        self.assertEqual(pmax_tid, critical_tid)
-        self.assertEqual(pmin_tid, add64(max_tid, 1))
-        self.assertEqual(plength, length / 2)
-        self.assertEqual(ppartition, rid)
-        calls = app.replicator.mockGetNamedCalls('checkTIDRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_tid, pmax_tid, plength, ppartition)
-
-    def test_answerCheckTIDRangeIdenticalChunkAboveCriticalTID(self):
-        critical_tid = self.getNextTID()
-        min_tid = self.getNextTID()
-        max_tid = self.getNextTID()
-        assert critical_tid < max_tid
-        length = RANGE_LENGTH / 2
-        rid = 12
-        conn = self.getFakeConnection()
-        app = self.getApp(tid_check_result=(length, 0, max_tid), rid=rid,
-            conn=conn, critical_tid=critical_tid)
-        handler = ReplicationHandler(app)
-        # Peer has the same data as we have: length, checksum and max_tid
-        # match.
-        handler.answerCheckTIDRange(conn, min_tid, length, length, 0, max_tid)
-        # Result: go on with object range checks
-        pmin_oid, pmin_serial, pmax_tid, plength, ppartition = \
-            self.checkAskPacket(conn, Packets.AskCheckSerialRange, decode=True)
-        self.assertEqual(pmin_oid, ZERO_OID)
-        self.assertEqual(pmin_serial, ZERO_TID)
-        self.assertEqual(plength, RANGE_LENGTH)
-        self.assertEqual(ppartition, rid)
-        calls = app.replicator.mockGetNamedCalls('checkSerialRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_oid, pmin_serial, pmax_tid, plength, ppartition)
-
-    def test_answerCheckTIDRangeIdenticalChunkWithoutNext(self):
-        min_tid = self.getNextTID()
-        max_tid = self.getNextTID()
-        length = RANGE_LENGTH / 2
-        rid = 12
-        num_partitions = 13
-        conn = self.getFakeConnection()
-        app = self.getApp(tid_check_result=(length - 1, 0, max_tid), rid=rid,
-            conn=conn, num_partitions=num_partitions)
-        handler = ReplicationHandler(app)
-        # Peer has the same data as we have: length, checksum and max_tid
-        # match.
-        handler.answerCheckTIDRange(conn, min_tid, length, length - 1, 0,
-            max_tid)
-        # Result: go on with object range checks
-        pmin_oid, pmin_serial, pmax_tid, plength, ppartition = \
-            self.checkAskPacket(conn, Packets.AskCheckSerialRange, decode=True)
-        self.assertEqual(pmin_oid, ZERO_OID)
-        self.assertEqual(pmin_serial, ZERO_TID)
-        self.assertEqual(plength, RANGE_LENGTH)
-        self.assertEqual(ppartition, rid)
-        calls = app.replicator.mockGetNamedCalls('checkSerialRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_oid, pmin_serial, pmax_tid, plength, ppartition)
-        # ...and delete partition tail
-        calls = app.dm.mockGetNamedCalls('deleteTransactionsAbove')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(rid, add64(max_tid, 1), ZERO_TID)
-
-    def test_answerCheckTIDRangeDifferentBigChunk(self):
-        min_tid = self.getNextTID()
-        max_tid = self.getNextTID()
-        critical_tid = self.getNextTID()
-        assert min_tid < max_tid < critical_tid, (min_tid, max_tid,
-            critical_tid)
-        length = RANGE_LENGTH / 2
-        rid = 12
-        conn = self.getFakeConnection()
-        app = self.getApp(tid_check_result=(length - 5, 0, max_tid), rid=rid,
-            conn=conn, critical_tid=critical_tid)
-        handler = ReplicationHandler(app)
-        # Peer has different data
-        handler.answerCheckTIDRange(conn, min_tid, length, length, 0, max_tid)
-        # Result: ask again, length halved
-        pmin_tid, pmax_tid, plength, ppartition = self.checkAskPacket(conn,
-            Packets.AskCheckTIDRange, decode=True)
-        self.assertEqual(pmin_tid, min_tid)
-        self.assertEqual(plength, length / 2)
-        self.assertEqual(ppartition, rid)
-        calls = app.replicator.mockGetNamedCalls('checkTIDRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_tid, pmax_tid, plength, ppartition)
-
-    def test_answerCheckTIDRangeDifferentSmallChunkWithNext(self):
-        min_tid = self.getNextTID()
-        max_tid = self.getNextTID()
-        critical_tid = self.getNextTID()
-        length = MIN_RANGE_LENGTH - 1
-        rid = 12
-        conn = self.getFakeConnection()
-        app = self.getApp(tid_check_result=(length - 5, 0, max_tid), rid=rid,
-            conn=conn, critical_tid=critical_tid)
-        handler = ReplicationHandler(app)
-        # Peer has different data
-        handler.answerCheckTIDRange(conn, min_tid, length, length, 0, max_tid)
-        # Result: ask tid list, and ask next chunk
-        calls = conn.mockGetNamedCalls('ask')
-        self.assertEqual(len(calls), 1)
-        tid_packet = calls[0].getParam(0)
-        self.assertEqual(type(tid_packet), Packets.AskTIDsFrom)
-        pmin_tid, pmax_tid, plength, ppartition = tid_packet.decode()
-        self.assertEqual(pmin_tid, min_tid)
-        self.assertEqual(pmax_tid, critical_tid)
-        self.assertEqual(plength, length)
-        self.assertEqual(ppartition, [rid])
-        calls = app.replicator.mockGetNamedCalls('getTIDsFrom')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_tid, pmax_tid, plength, ppartition[0])
-
-    def test_answerCheckTIDRangeDifferentSmallChunkWithoutNext(self):
-        min_tid = self.getNextTID()
-        max_tid = self.getNextTID()
-        critical_tid = self.getNextTID()
-        length = MIN_RANGE_LENGTH - 1
-        rid = 12
-        conn = self.getFakeConnection()
-        app = self.getApp(tid_check_result=(length - 5, 0, max_tid), rid=rid,
-            conn=conn, critical_tid=critical_tid)
-        handler = ReplicationHandler(app)
-        # Peer has different data, and less than length
-        handler.answerCheckTIDRange(conn, min_tid, length, length - 1, 0,
-            max_tid)
-        # Result: ask tid list, and start replicating object range
-        calls = conn.mockGetNamedCalls('ask')
-        self.assertEqual(len(calls), 2)
-        tid_packet = calls[0].getParam(0)
-        self.assertEqual(type(tid_packet), Packets.AskTIDsFrom)
-        pmin_tid, pmax_tid, plength, ppartition = tid_packet.decode()
-        self.assertEqual(pmin_tid, min_tid)
-        self.assertEqual(pmax_tid, critical_tid)
-        self.assertEqual(plength, length - 1)
-        self.assertEqual(ppartition, [rid])
-        calls = app.replicator.mockGetNamedCalls('getTIDsFrom')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_tid, pmax_tid, plength, ppartition[0])
-
-    # CheckSerialRange
-    def test_answerCheckSerialFullRangeIdenticalChunkWithNext(self):
-        min_oid = self.getOID(1)
-        max_oid = self.getOID(10)
-        min_serial = self.getNextTID()
-        max_serial = self.getNextTID()
-        length = RANGE_LENGTH
-        rid = 12
-        conn = self.getFakeConnection()
-        app = self.getApp(serial_check_result=(length, 0, max_oid, 1,
-            max_serial), rid=rid, conn=conn)
-        handler = ReplicationHandler(app)
-        # Peer has the same data as we have
-        handler.answerCheckSerialRange(conn, min_oid, min_serial, length,
-            length, 0, max_oid, 1, max_serial)
-        # Result: go on with next chunk
-        pmin_oid, pmin_serial, pmax_tid, plength, ppartition = \
-            self.checkAskPacket(conn, Packets.AskCheckSerialRange, decode=True)
-        self.assertEqual(pmin_oid, max_oid)
-        self.assertEqual(pmin_serial, add64(max_serial, 1))
-        self.assertEqual(plength, RANGE_LENGTH)
-        self.assertEqual(ppartition, rid)
-        calls = app.replicator.mockGetNamedCalls('checkSerialRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_oid, pmin_serial, pmax_tid, plength, ppartition)
-
-    def test_answerCheckSerialSmallRangeIdenticalChunkWithNext(self):
-        min_oid = self.getOID(1)
-        max_oid = self.getOID(10)
-        min_serial = self.getNextTID()
-        max_serial = self.getNextTID()
-        length = RANGE_LENGTH / 2
-        rid = 12
-        conn = self.getFakeConnection()
-        app = self.getApp(serial_check_result=(length, 0, max_oid, 1,
-            max_serial), rid=rid, conn=conn)
-        handler = ReplicationHandler(app)
-        # Peer has the same data as we have
-        handler.answerCheckSerialRange(conn, min_oid, min_serial, length,
-            length, 0, max_oid, 1, max_serial)
-        # Result: go on with next chunk
-        pmin_oid, pmin_serial, pmax_tid, plength, ppartition = \
-            self.checkAskPacket(conn, Packets.AskCheckSerialRange, decode=True)
-        self.assertEqual(pmin_oid, max_oid)
-        self.assertEqual(pmin_serial, add64(max_serial, 1))
-        self.assertEqual(plength, length / 2)
-        self.assertEqual(ppartition, rid)
-        calls = app.replicator.mockGetNamedCalls('checkSerialRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_oid, pmin_serial, pmax_tid, plength, ppartition)
-
-    def test_answerCheckSerialRangeIdenticalChunkWithoutNext(self):
-        min_oid = self.getOID(1)
-        max_oid = self.getOID(10)
-        min_serial = self.getNextTID()
-        max_serial = self.getNextTID()
-        length = RANGE_LENGTH / 2
-        rid = 12
-        num_partitions = 13
-        conn = self.getFakeConnection()
-        app = self.getApp(serial_check_result=(length - 1, 0, max_oid, 1,
-            max_serial), rid=rid, conn=conn, num_partitions=num_partitions)
-        handler = ReplicationHandler(app)
-        # Peer has the same data as we have
-        handler.answerCheckSerialRange(conn, min_oid, min_serial, length,
-            length - 1, 0, max_oid, 1, max_serial)
-        # Result: mark replication as done
-        self.checkNoPacketSent(conn)
-        self.assertTrue(app.replicator.replication_done)
-        # ...and delete partition tail
-        calls = app.dm.mockGetNamedCalls('deleteObjectsAbove')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(rid, max_oid, add64(max_serial, 1), ZERO_TID)
-
-    def test_answerCheckSerialRangeDifferentBigChunk(self):
-        min_oid = self.getOID(1)
-        max_oid = self.getOID(10)
-        min_serial = self.getNextTID()
-        max_serial = self.getNextTID()
-        length = RANGE_LENGTH / 2
-        rid = 12
-        conn = self.getFakeConnection()
-        app = self.getApp(tid_check_result=(length - 5, 0, max_oid, 1,
-            max_serial), rid=rid, conn=conn)
-        handler = ReplicationHandler(app)
-        # Peer has different data
-        handler.answerCheckSerialRange(conn, min_oid, min_serial, length,
-            length, 0, max_oid, 1, max_serial)
-        # Result: ask again, length halved
-        pmin_oid, pmin_serial, pmax_tid, plength, ppartition = \
-            self.checkAskPacket(conn, Packets.AskCheckSerialRange, decode=True)
-        self.assertEqual(pmin_oid, min_oid)
-        self.assertEqual(pmin_serial, min_serial)
-        self.assertEqual(plength, length / 2)
-        self.assertEqual(ppartition, rid)
-        calls = app.replicator.mockGetNamedCalls('checkSerialRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_oid, pmin_serial, pmax_tid, plength, ppartition)
-
-    def test_answerCheckSerialRangeDifferentSmallChunkWithNext(self):
-        min_oid = self.getOID(1)
-        max_oid = self.getOID(10)
-        min_serial = self.getNextTID()
-        max_serial = self.getNextTID()
-        critical_tid = self.getNextTID()
-        length = MIN_RANGE_LENGTH - 1
-        rid = 12
-        conn = self.getFakeConnection()
-        app = self.getApp(tid_check_result=(length - 5, 0, max_oid, 1,
-            max_serial), rid=rid, conn=conn, critical_tid=critical_tid)
-        handler = ReplicationHandler(app)
-        # Peer has different data
-        handler.answerCheckSerialRange(conn, min_oid, min_serial, length,
-            length, 0, max_oid, 1, max_serial)
-        # Result: ask serial list, and ask next chunk
-        calls = conn.mockGetNamedCalls('ask')
-        self.assertEqual(len(calls), 1)
-        serial_packet = calls[0].getParam(0)
-        self.assertEqual(type(serial_packet), Packets.AskObjectHistoryFrom)
-        pmin_oid, pmin_serial, pmax_serial, plength, ppartition = \
-            serial_packet.decode()
-        self.assertEqual(pmin_oid, min_oid)
-        self.assertEqual(pmin_serial, min_serial)
-        self.assertEqual(pmax_serial, critical_tid)
-        self.assertEqual(plength, length)
-        self.assertEqual(ppartition, rid)
-        calls = app.replicator.mockGetNamedCalls('getObjectHistoryFrom')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_oid, pmin_serial, pmax_serial, plength,
-            ppartition)
-
-    def test_answerCheckSerialRangeDifferentSmallChunkWithoutNext(self):
-        min_oid = self.getOID(1)
-        max_oid = self.getOID(10)
-        min_serial = self.getNextTID()
-        max_serial = self.getNextTID()
-        critical_tid = self.getNextTID()
-        length = MIN_RANGE_LENGTH - 1
-        rid = 12
-        num_partitions = 13
-        conn = self.getFakeConnection()
-        app = self.getApp(tid_check_result=(length - 5, 0, max_oid,
-            1, max_serial), rid=rid, conn=conn, critical_tid=critical_tid,
-            num_partitions=num_partitions,
-        )
-        handler = ReplicationHandler(app)
-        # Peer has different data, and less than length
-        handler.answerCheckSerialRange(conn, min_oid, min_serial, length,
-            length - 1, 0, max_oid, 1, max_serial)
-        # Result: ask tid list, and mark replication as done
-        pmin_oid, pmin_serial, pmax_serial, plength, ppartition = \
-            self.checkAskPacket(conn, Packets.AskObjectHistoryFrom,
-            decode=True)
-        self.assertEqual(pmin_oid, min_oid)
-        self.assertEqual(pmin_serial, min_serial)
-        self.assertEqual(pmax_serial, critical_tid)
-        self.assertEqual(plength, length - 1)
-        self.assertEqual(ppartition, rid)
-        calls = app.replicator.mockGetNamedCalls('getObjectHistoryFrom')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(pmin_oid, pmin_serial, pmax_serial, plength,
-            ppartition)
-        self.assertTrue(app.replicator.replication_done)
-        # ...and delete partition tail
-        calls = app.dm.mockGetNamedCalls('deleteObjectsAbove')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(rid, max_oid, add64(max_serial, 1), critical_tid)
-
-if __name__ == "__main__":
-    unittest.main()

neo/tests/storage/testReplicator.py

-#
-# Copyright (C) 2010  Nexedi SA
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-
-import unittest
-from mock import Mock, ReturnValues
-from .. import NeoUnitTestBase
-from neo.storage.replicator import Replicator, Partition, Task
-from neo.lib.protocol import CellStates, NodeStates, Packets
-
-class StorageReplicatorTests(NeoUnitTestBase):
-
-    def setup(self):
-        pass
-
-    def teardown(self):
-        pass
-
-    def test_populate(self):
-        my_uuid = self.getNewUUID()
-        other_uuid = self.getNewUUID()
-        app = Mock()
-        app.uuid = my_uuid
-        app.pt = Mock({
-            'getPartitions': 2,
-            'getOutdatedOffsetListFor': [0],
-        })
-        replicator = Replicator(app)
-        self.assertEqual(replicator.new_partition_set, set())
-        replicator.populate()
-        self.assertEqual(replicator.new_partition_set, set([0]))
-
-    def test_reset(self):
-        replicator = Replicator(None)
-        replicator.task_list = ['foo']
-        replicator.task_dict = {'foo': 'bar'}
-        replicator.current_partition = 'foo'
-        replicator.current_connection = 'foo'
-        replicator.replication_done = 'foo'
-        replicator.reset()
-        self.assertEqual(replicator.task_list, [])
-        self.assertEqual(replicator.task_dict, {})
-        self.assertEqual(replicator.current_partition, None)
-        self.assertEqual(replicator.current_connection, None)
-        self.assertTrue(replicator.replication_done)
-
-    def test_setCriticalTID(self):
-        critical_tid = self.getNextTID()
-        partition = Partition(0, critical_tid, [])
-        self.assertEqual(partition.getCriticalTID(), critical_tid)
-        self.assertEqual(partition.getOffset(), 0)
-
-    def test_act(self):
-        # Also tests "pending"
-        uuid = self.getNewUUID()
-        master_uuid = self.getNewUUID()
-        critical_tid_0 = self.getNextTID()
-        critical_tid_1 = self.getNextTID()
-        critical_tid_2 = self.getNextTID()
-        unfinished_ttid_1 = self.getOID(1)
-        unfinished_ttid_2 = self.getOID(2)
-        app = Mock()
-        app.server = ('127.0.0.1', 10000)
-        app.name = 'fake cluster'
-        app.em = Mock({
-            'register': None,
-        })
-        def connectorGenerator():
-            return Mock()
-        app.connector_handler = connectorGenerator
-        app.uuid = uuid
-        node_addr = ('127.0.0.1', 1234)
-        node = Mock({
-            'getAddress': node_addr,
-        })
-        running_cell = Mock({
-            'getNodeState': NodeStates.RUNNING,
-            'getNode': node,
-        })
-        unknown_cell = Mock({
-            'getNodeState': NodeStates.UNKNOWN,
-        })
-        app.pt = Mock({
-            'getCellList': [running_cell, unknown_cell],
-            'getOutdatedOffsetListFor': [0],
-            'getPartition': 0,
-        })
-        node_conn_handler = Mock({
-            'startReplication': None,
-        })
-        node_conn = Mock({
-            'getAddress': node_addr,
-            'getHandler': node_conn_handler,
-        })
-        replicator = Replicator(app)
-        replicator.populate()
-        def act():
-            app.master_conn = self.getFakeConnection(uuid=master_uuid)
-            self.assertTrue(replicator.pending())
-            replicator.act()
-        # ask unfinished tids
-        act()
-        unfinished_tids = app.master_conn.mockGetNamedCalls('ask')[0].getParam(0)
-        self.assertTrue(replicator.new_partition_set)
-        self.assertEqual(type(unfinished_tids),
-            Packets.AskUnfinishedTransactions)
-        self.assertTrue(replicator.waiting_for_unfinished_tids)
-        # nothing happens until waiting_for_unfinished_tids becomes False
-        act()
-        self.checkNoPacketSent(app.master_conn)
-        self.assertTrue(replicator.waiting_for_unfinished_tids)
-        # first time, there is an unfinished tid before critical tid,
-        # replication cannot start, and unfinished TIDs are asked again
-        replicator.setUnfinishedTIDList(critical_tid_0,
-            [unfinished_ttid_1, unfinished_ttid_2])
-        self.assertFalse(replicator.waiting_for_unfinished_tids)
-        # Note: detection that nothing can be replicated happens on first call
-        # and unfinished tids are asked again on second call. This is ok, but
-        # might change, so just call twice.
-        act()
-        replicator.transactionFinished(unfinished_ttid_1, critical_tid_1)
-        act()
-        replicator.transactionFinished(unfinished_ttid_2, critical_tid_2)
-        replicator.current_connection = node_conn
-        act()
-        self.assertEqual(replicator.current_partition,
-            replicator.partition_dict[0])
-        self.assertEqual(len(node_conn_handler.mockGetNamedCalls(
-            'startReplication')), 1)
-        self.assertFalse(replicator.replication_done)
-        # Other calls should do nothing
-        replicator.current_connection = Mock()
-        act()
-        self.checkNoPacketSent(app.master_conn)
-        self.checkNoPacketSent(replicator.current_connection)
-        # Mark replication over for this partition
-        replicator.replication_done = True
-        # Don't finish while there are pending answers
-        replicator.current_connection = Mock({
-            'isPending': True,
-        })
-        act()
-        self.assertTrue(replicator.pending())
-        replicator.current_connection = Mock({
-            'isPending': False,
-        })
-        act()
-        # also, replication is over
-        self.assertFalse(replicator.pending())
-
-    def test_removePartition(self):
-        replicator = Replicator(None)
-        replicator.partition_dict = {0: None, 2: None}
-        replicator.new_partition_set = set([1])
-        replicator.removePartition(0)
-        self.assertEqual(replicator.partition_dict, {2: None})
-        self.assertEqual(replicator.new_partition_set, set([1]))
-        replicator.removePartition(1)
-        replicator.removePartition(2)
-        self.assertEqual(replicator.partition_dict, {})
-        self.assertEqual(replicator.new_partition_set, set())
-        # Must not raise
-        replicator.removePartition(3)
-
-    def test_addPartition(self):
-        replicator = Replicator(None)
-        replicator.partition_dict = {0: None}
-        replicator.new_partition_set = set([1])
-        replicator.addPartition(0)
-        replicator.addPartition(1)
-        self.assertEqual(replicator.partition_dict, {0: None})
-        self.assertEqual(replicator.new_partition_set, set([1]))
-        replicator.addPartition(2)
-        self.assertEqual(replicator.partition_dict, {0: None})
-        self.assertEqual(len(replicator.new_partition_set), 2)
-        self.assertEqual(replicator.new_partition_set, set([1, 2]))
-
-    def test_processDelayedTasks(self):
-        replicator = Replicator(None)
-        replicator.reset()
-        marker = []
-        def someCallable(foo, bar=None):
-            return (foo, bar)
-        replicator._addTask(1, someCallable, args=('foo', ))
-        self.assertRaises(ValueError, replicator._addTask, 1, None)
-        replicator._addTask(2, someCallable, args=('foo', ), kw={'bar': 'bar'})
-        replicator.processDelayedTasks()
-        self.assertEqual(replicator._getCheckResult(1), ('foo', None))
-        self.assertEqual(replicator._getCheckResult(2), ('foo', 'bar'))
-        # Also test Task
-        task = Task(someCallable, args=('foo', ))
-        self.assertRaises(ValueError, task.getResult)
-        task.process()
-        self.assertRaises(ValueError, task.process)
-        self.assertEqual(task.getResult(), ('foo', None))
-
-if __name__ == "__main__":
-    unittest.main()
-

neo/tests/storage/testStorageDBTests.py

@@ -18,11 +18,10 @@
 import unittest
 from mock import Mock
 from neo.lib.util import dump, p64, u64
-from neo.lib.protocol import CellStates, ZERO_OID, ZERO_TID
+from neo.lib.protocol import CellStates, ZERO_OID, ZERO_TID, MAX_TID
 from .. import NeoUnitTestBase
 from neo.lib.exception import DatabaseFailure
 
-MAX_TID = '\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFE' # != INVALID_TID
 
 class StorageDBTests(NeoUnitTestBase):
 
@@ -74,7 +73,7 @@ class StorageDBTests(NeoUnitTestBase):
 
     def checkConfigEntry(self, get_call, set_call, value):
         # generic test for all configuration entries accessors
-        self.assertRaises(KeyError, get_call)
+        self.assertEqual(get_call(), None)
         set_call(value)
         self.assertEqual(get_call(), value)
         set_call(value * 2)
@@ -92,6 +91,29 @@ class StorageDBTests(NeoUnitTestBase):
         db = self.getDB()
         self.checkConfigEntry(db.getPTID, db.setPTID, self.getPTID(1))
 
+    def test_transaction(self):
+        db = self.getDB()
+        x = []
+        class DB(db.__class__):
+            begin    = lambda self: x.append('begin')
+            commit   = lambda self: x.append('commit')
+            rollback = lambda self: x.append('rollback')
+        db.__class__ = DB
+        with db:
+            self.assertEqual(x.pop(), 'begin')
+        self.assertEqual(x.pop(), 'commit')
+        try:
+            with db:
+                self.assertEqual(x.pop(), 'begin')
+                with db:
+                    self.fail()
+            self.fail()
+        except DatabaseFailure:
+            pass
+        self.assertEqual(x.pop(), 'rollback')
+        self.assertRaises(DatabaseFailure, db.__exit__, None, None, None)
+        self.assertFalse(x)
+
     def test_getPartitionTable(self):
         db = self.getDB()
         ptid = self.getPTID(1)
@@ -128,21 +150,22 @@ class StorageDBTests(NeoUnitTestBase):
     def checkSet(self, list1, list2):
         self.assertEqual(set(list1), set(list2))
 
-    def test_getLastTID(self):
+    def test_getLastTIDs(self):
         tid1, tid2, tid3, tid4 = self.getTIDs(4)
         oid1, oid2 = self.getOIDs(2)
         txn, objs = self.getTransaction([oid1, oid2])
-        # max TID is in obj table
         self.db.storeTransaction(tid1, objs, txn, False)
         self.db.storeTransaction(tid2, objs, txn, False)
-        self.assertEqual(self.db.getLastTID(), tid2)
-        # max tid is in ttrans table
+        self.assertEqual(self.db.getLastTIDs(), (tid2, {0: tid2}, {0: tid2}))
         self.db.storeTransaction(tid3, objs, txn)
-        result = self.db.getLastTID()
-        self.assertEqual(self.db.getLastTID(), tid3)
-        # max tid is in tobj (serial)
+        tids = {0: tid2, None: tid3}
+        self.assertEqual(self.db.getLastTIDs(), (tid3, tids, tids))
         self.db.storeTransaction(tid4, objs, None)
-        self.assertEqual(self.db.getLastTID(), tid4)
+        self.assertEqual(self.db.getLastTIDs(),
+            (tid4, tids, {0: tid2, None: tid4}))
+        self.db.finishTransaction(tid3)
+        self.assertEqual(self.db.getLastTIDs(),
+            (tid4, {0: tid3}, {0: tid3, None: tid4}))
 
     def test_getUnfinishedTIDList(self):
         tid1, tid2, tid3, tid4 = self.getTIDs(4)
@@ -294,7 +317,7 @@ class StorageDBTests(NeoUnitTestBase):
         txn1, objs1 = self.getTransaction([oid1])
         txn2, objs2 = self.getTransaction([oid2])
         # nothing in database
-        self.assertEqual(self.db.getLastTID(), None)
+        self.assertEqual(self.db.getLastTIDs(), (None, {}, {}))
         self.assertEqual(self.db.getUnfinishedTIDList(), [])
         self.assertEqual(self.db.getObject(oid1), None)
         self.assertEqual(self.db.getObject(oid2), None)
@@ -362,24 +385,6 @@ class StorageDBTests(NeoUnitTestBase):
         self.assertEqual(self.db.getTransaction(tid1, True), None)
         self.assertEqual(self.db.getTransaction(tid2, True), None)
 
-    def test_deleteTransactionsAbove(self):
-        self.setNumPartitions(2)
-        tid1 = self.getOID(0)
-        tid2 = self.getOID(1)
-        tid3 = self.getOID(2)
-        oid1 = self.getOID(1)
-        for tid in (tid1, tid2, tid3):
-            txn, objs = self.getTransaction([oid1])
-            self.db.storeTransaction(tid, objs, txn)
-            self.db.finishTransaction(tid)
-        self.db.deleteTransactionsAbove(0, tid2, tid3)
-        # Right partition, below cutoff
-        self.assertNotEqual(self.db.getTransaction(tid1, True), None)
-        # Wrong partition, above cutoff
-        self.assertNotEqual(self.db.getTransaction(tid2, True), None)
-        # Right partition, above cutoff
-        self.assertEqual(self.db.getTransaction(tid3, True), None)
-
     def test_deleteObject(self):
         oid1, oid2 = self.getOIDs(2)
         tid1, tid2 = self.getTIDs(2)
@@ -397,34 +402,28 @@ class StorageDBTests(NeoUnitTestBase):
         self.assertEqual(self.db.getObject(oid2, tid=tid2),
             (tid2, None, 1, "0" * 20, '', None))
 
-    def test_deleteObjectsAbove(self):
-        self.setNumPartitions(2)
-        tid1 = self.getOID(1)
-        tid2 = self.getOID(2)
-        tid3 = self.getOID(3)
-        oid1 = self.getOID(0)
-        oid2 = self.getOID(1)
-        oid3 = self.getOID(2)
-        for tid in (tid1, tid2, tid3):
-            txn, objs = self.getTransaction([oid1, oid2, oid3])
+    def test_deleteRange(self):
+        np = 4
+        self.setNumPartitions(np)
+        t1, t2, t3 = map(self.getOID, (1, 2, 3))
+        oid_list = self.getOIDs(np * 2)
+        for tid in t1, t2, t3:
+            txn, objs = self.getTransaction(oid_list)
             self.db.storeTransaction(tid, objs, txn)
             self.db.finishTransaction(tid)
-        self.db.deleteObjectsAbove(0, oid1, tid2, tid3)
-        # Check getObjectHistoryFrom because MySQL adapter use two tables
-        # that must be synchronized
-        self.assertEqual(self.db.getObjectHistoryFrom(ZERO_OID, ZERO_TID,
-            MAX_TID, 10, 0), {oid1: [tid1]})
-        # Right partition, below cutoff
-        self.assertNotEqual(self.db.getObject(oid1, tid=tid1), None)
-        # Right partition, above tid cutoff
-        self.assertFalse(self.db.getObject(oid1, tid=tid2))
-        self.assertFalse(self.db.getObject(oid1, tid=tid3))
-        # Wrong partition, above cutoff
-        self.assertNotEqual(self.db.getObject(oid2, tid=tid1), None)
-        self.assertNotEqual(self.db.getObject(oid2, tid=tid2), None)
-        self.assertNotEqual(self.db.getObject(oid2, tid=tid3), None)
-        # Right partition, above cutoff
-        self.assertEqual(self.db.getObject(oid3), None)
+        def check(offset, tid_list, *tids):
+            self.assertEqual(self.db.getReplicationTIDList(ZERO_TID,
+                MAX_TID, len(tid_list) + 1, offset), tid_list)
+            expected = [(t, oid_list[offset+i]) for t in tids for i in 0, np]
+            self.assertEqual(self.db.getReplicationObjectList(ZERO_TID,
+                MAX_TID, len(expected) + 1, offset, ZERO_OID), expected)
+        self.db._deleteRange(0, MAX_TID)
+        self.db._deleteRange(0, max_tid=ZERO_TID)
+        check(0, [], t1, t2, t3)
+        self.db._deleteRange(0);             check(0, [])
+        self.db._deleteRange(1, t2);         check(1, [t1], t1, t2)
+        self.db._deleteRange(2, max_tid=t2); check(2, [], t3)
+        self.db._deleteRange(3, t1, t2);     check(3, [t3], t1, t3)
 
     def test_getTransaction(self):
         oid1, oid2 = self.getOIDs(2)
@@ -467,59 +466,6 @@ class StorageDBTests(NeoUnitTestBase):
         result = self.db.getObjectHistory(oid, 2, 3)
         self.assertEqual(result, None)
 
-    def test_getObjectHistoryFrom(self):
-        self.setNumPartitions(2)
-        oid1 = self.getOID(0)
-        oid2 = self.getOID(2)
-        oid3 = self.getOID(1)
-        tid1, tid2, tid3, tid4, tid5 = self.getTIDs(5)
-        txn1, objs1 = self.getTransaction([oid1])
-        txn2, objs2 = self.getTransaction([oid2])
-        txn3, objs3 = self.getTransaction([oid1])
-        txn4, objs4 = self.getTransaction([oid2])
-        txn5, objs5 = self.getTransaction([oid3])
-        self.db.storeTransaction(tid1, objs1, txn1)
-        self.db.storeTransaction(tid2, objs2, txn2)
-        self.db.storeTransaction(tid3, objs3, txn3)
-        self.db.storeTransaction(tid4, objs4, txn4)
-        self.db.storeTransaction(tid5, objs5, txn5)
-        self.db.finishTransaction(tid1)
-        self.db.finishTransaction(tid2)
-        self.db.finishTransaction(tid3)
-        self.db.finishTransaction(tid4)
-        self.db.finishTransaction(tid5)
-        # Check full result
-        result = self.db.getObjectHistoryFrom(ZERO_OID, ZERO_TID, MAX_TID, 10,
-            0)
-        self.assertEqual(result, {
-            oid1: [tid1, tid3],
-            oid2: [tid2, tid4],
-        })
-        # Lower bound is inclusive
-        result = self.db.getObjectHistoryFrom(oid1, tid1, MAX_TID, 10, 0)
-        self.assertEqual(result, {
-            oid1: [tid1, tid3],
-            oid2: [tid2, tid4],
-        })
-        # Upper bound is inclusive
-        result = self.db.getObjectHistoryFrom(ZERO_OID, ZERO_TID, tid3, 10, 0)
-        self.assertEqual(result, {
-            oid1: [tid1, tid3],
-            oid2: [tid2],
-        })
-        # Length is total number of serials
-        result = self.db.getObjectHistoryFrom(ZERO_OID, ZERO_TID, MAX_TID, 3, 0)
-        self.assertEqual(result, {
-            oid1: [tid1, tid3],
-            oid2: [tid2],
-        })
-        # Partition constraints are honored
-        result = self.db.getObjectHistoryFrom(ZERO_OID, ZERO_TID, MAX_TID, 10,
-            1)
-        self.assertEqual(result, {
-            oid3: [tid5],
-        })
-
     def _storeTransactions(self, count):
         # use OID generator to know result of tid % N
         tid_list = self.getOIDs(count)

neo/tests/storage/testStorageHandler.py

-#
-# Copyright (C) 2009-2010  Nexedi SA
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-
-import unittest
-from mock import Mock
-from collections import deque
-from .. import NeoUnitTestBase
-from neo.storage.app import Application
-from neo.storage.handlers.storage import StorageOperationHandler
-from neo.lib.protocol import INVALID_PARTITION, Packets
-from neo.lib.protocol import INVALID_TID, INVALID_OID
-
-class StorageStorageHandlerTests(NeoUnitTestBase):
-
-    def checkHandleUnexpectedPacket(self, _call, _msg_type, _listening=True, **kwargs):
-        conn = self.getFakeConnection(address=("127.0.0.1", self.master_port),
-                is_server=_listening)
-        # hook
-        self.operation.peerBroken = lambda c: c.peerBrokendCalled()
-        self.checkUnexpectedPacketRaised(_call, conn=conn, **kwargs)
-
-    def setUp(self):
-        NeoUnitTestBase.setUp(self)
-        self.prepareDatabase(number=1)
-        # create an application object
-        config = self.getStorageConfiguration(master_number=1)
-        self.app = Application(config)
-        self.app.transaction_dict = {}
-        self.app.store_lock_dict = {}
-        self.app.load_lock_dict = {}
-        self.app.event_queue = deque()
-        self.app.event_queue_dict = {}
-        # handler
-        self.operation = StorageOperationHandler(self.app)
-        # set pmn
-        self.master_uuid = self.getNewUUID()
-        pmn = self.app.nm.getMasterList()[0]
-        pmn.setUUID(self.master_uuid)
-        self.app.primary_master_node = pmn
-        self.master_port = 10010
-
-    def test_18_askTransactionInformation1(self):
-        # transaction does not exists
-        conn = self.getFakeConnection()
-        self.app.dm = Mock({'getNumPartitions': 1})
-        self.operation.askTransactionInformation(conn, INVALID_TID)
-        self.checkErrorPacket(conn)
-
-    def test_18_askTransactionInformation2(self):
-        # answer
-        conn = self.getFakeConnection()
-        tid = self.getNextTID()
-        oid_list = [self.getOID(1), self.getOID(2)]
-        dm = Mock({"getTransaction": (oid_list, 'user', 'desc', '', False), })
-        self.app.dm = dm
-        self.operation.askTransactionInformation(conn, tid)
-        self.checkAnswerTransactionInformation(conn)
-
-    def test_24_askObject1(self):
-        # delayed response
-        conn = self.getFakeConnection()
-        oid = self.getOID(1)
-        tid = self.getNextTID()
-        serial = self.getNextTID()
-        self.app.dm = Mock()
-        self.app.tm = Mock({'loadLocked': True})
-        self.app.load_lock_dict[oid] = object()
-        self.assertEqual(len(self.app.event_queue), 0)
-        self.operation.askObject(conn, oid=oid, serial=serial, tid=tid)
-        self.assertEqual(len(self.app.event_queue), 1)
-        self.checkNoPacketSent(conn)
-        self.assertEqual(len(self.app.dm.mockGetNamedCalls('getObject')), 0)
-
-    def test_24_askObject2(self):
-        # invalid serial / tid / packet not found
-        self.app.dm = Mock({'getObject': None})
-        conn = self.getFakeConnection()
-        oid = self.getOID(1)
-        tid = self.getNextTID()
-        serial = self.getNextTID()
-        self.assertEqual(len(self.app.event_queue), 0)
-        self.operation.askObject(conn, oid=oid, serial=serial, tid=tid)
-        calls = self.app.dm.mockGetNamedCalls('getObject')
-        self.assertEqual(len(self.app.event_queue), 0)
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(oid, serial, tid)
-        self.checkErrorPacket(conn)
-
-    def test_24_askObject3(self):
-        oid = self.getOID(1)
-        tid = self.getNextTID()
-        serial = self.getNextTID()
-        next_serial = self.getNextTID()
-        H = "0" * 20
-        # object found => answer
-        self.app.dm = Mock({'getObject': (serial, next_serial, 0, H, '', None)})
-        conn = self.getFakeConnection()
-        self.assertEqual(len(self.app.event_queue), 0)
-        self.operation.askObject(conn, oid=oid, serial=serial, tid=tid)
-        self.assertEqual(len(self.app.event_queue), 0)
-        self.checkAnswerObject(conn)
-
-    def test_25_askTIDsFrom(self):
-        # well case => answer
-        conn = self.getFakeConnection()
-        self.app.dm = Mock({'getReplicationTIDList': (INVALID_TID, )})
-        self.app.pt = Mock({'getPartitions': 1})
-        tid = self.getNextTID()
-        tid2 = self.getNextTID()
-        self.operation.askTIDsFrom(conn, tid, tid2, 2, [1])
-        calls = self.app.dm.mockGetNamedCalls('getReplicationTIDList')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(tid, tid2, 2, 1)
-        self.checkAnswerTidsFrom(conn)
-
-    def test_26_askObjectHistoryFrom(self):
-        min_oid = self.getOID(2)
-        min_serial = self.getNextTID()
-        max_serial = self.getNextTID()
-        length = 4
-        partition = 8
-        num_partitions = 16
-        tid = self.getNextTID()
-        conn = self.getFakeConnection()
-        self.app.dm = Mock({'getObjectHistoryFrom': {min_oid: [tid]},})
-        self.app.pt = Mock({
-            'getPartitions': num_partitions,
-        })
-        self.operation.askObjectHistoryFrom(conn, min_oid, min_serial,
-            max_serial, length, partition)
-        self.checkAnswerObjectHistoryFrom(conn)
-        calls = self.app.dm.mockGetNamedCalls('getObjectHistoryFrom')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(min_oid, min_serial, max_serial, length, partition)
-
-    def test_askCheckTIDRange(self):
-        count = 1
-        tid_checksum = "1" * 20
-        min_tid = self.getNextTID()
-        num_partitions = 4
-        length = 5
-        partition = 6
-        max_tid = self.getNextTID()
-        self.app.dm = Mock({'checkTIDRange': (count, tid_checksum, max_tid)})
-        self.app.pt = Mock({'getPartitions': num_partitions})
-        conn = self.getFakeConnection()
-        self.operation.askCheckTIDRange(conn, min_tid, max_tid, length, partition)
-        calls = self.app.dm.mockGetNamedCalls('checkTIDRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(min_tid, max_tid, length, partition)
-        pmin_tid, plength, pcount, ptid_checksum, pmax_tid = \
-            self.checkAnswerPacket(conn, Packets.AnswerCheckTIDRange,
-            decode=True)
-        self.assertEqual(min_tid, pmin_tid)
-        self.assertEqual(length, plength)
-        self.assertEqual(count, pcount)
-        self.assertEqual(tid_checksum, ptid_checksum)
-        self.assertEqual(max_tid, pmax_tid)
-
-    def test_askCheckSerialRange(self):
-        count = 1
-        oid_checksum = "2" * 20
-        min_oid = self.getOID(1)
-        num_partitions = 4
-        length = 5
-        partition = 6
-        serial_checksum = "3" * 20
-        min_serial = self.getNextTID()
-        max_serial = self.getNextTID()
-        max_oid = self.getOID(2)
-        self.app.dm = Mock({'checkSerialRange': (count, oid_checksum, max_oid,
-            serial_checksum, max_serial)})
-        self.app.pt = Mock({'getPartitions': num_partitions})
-        conn = self.getFakeConnection()
-        self.operation.askCheckSerialRange(conn, min_oid, min_serial,
-            max_serial, length, partition)
-        calls = self.app.dm.mockGetNamedCalls('checkSerialRange')
-        self.assertEqual(len(calls), 1)
-        calls[0].checkArgs(min_oid, min_serial, max_serial, length, partition)
-        pmin_oid, pmin_serial, plength, pcount, poid_checksum, pmax_oid, \
-            pserial_checksum, pmax_serial = self.checkAnswerPacket(conn,
-            Packets.AnswerCheckSerialRange, decode=True)
-        self.assertEqual(min_oid, pmin_oid)
-        self.assertEqual(min_serial, pmin_serial)
-        self.assertEqual(length, plength)
-        self.assertEqual(count, pcount)
-        self.assertEqual(oid_checksum, poid_checksum)
-        self.assertEqual(max_oid, pmax_oid)
-        self.assertEqual(serial_checksum, pserial_checksum)
-        self.assertEqual(max_serial, pmax_serial)
-
-if __name__ == "__main__":
-    unittest.main()

neo/tests/storage/testStorageMySQLdb.py → neo/tests/storage/testStorageMySQL.py

@@ -35,11 +35,6 @@ class StorageMySQSLdbTests(StorageDBTests):
         db.setup(reset)
         return db
 
-    def checkCalledQuery(self, query=None, call=0):
-        self.assertTrue(len(self.db.conn.mockGetNamedCalls('query')) > call)
-        call = self.db.conn.mockGetNamedCalls('query')[call]
-        call.checkArgs('BEGIN')
-
     def test_MySQLDatabaseManagerInit(self):
         db = MySQLDatabaseManager('%s@%s' % (NEO_SQL_USER, NEO_SQL_DATABASE),
             0)
@@ -48,30 +43,6 @@ class StorageMySQSLdbTests(StorageDBTests):
         self.assertEqual(db.user, NEO_SQL_USER)
         # & connect
         self.assertTrue(isinstance(db.conn, MySQLdb.connection))
-        self.assertFalse(db.isUnderTransaction())
-
-    def test_begin(self):
-        # no current transaction
-        self.db.conn = Mock({ })
-        self.assertFalse(self.db.isUnderTransaction())
-        self.db.begin()
-        self.checkCalledQuery(query='COMMIT')
-        self.assertTrue(self.db.isUnderTransaction())
-
-    def test_commit(self):
-        self.db.conn = Mock()
-        self.db.begin()
-        self.db.commit()
-        self.assertEqual(len(self.db.conn.mockGetNamedCalls('commit')), 1)
-        self.assertFalse(self.db.isUnderTransaction())
-
-    def test_rollback(self):
-        # rollback called and no current transaction
-        self.db.conn = Mock({ })
-        self.db.under_transaction = True
-        self.db.rollback()
-        self.assertEqual(len(self.db.conn.mockGetNamedCalls('rollback')), 1)
-        self.assertFalse(self.db.isUnderTransaction())
 
     def test_query1(self):
         # fake result object

neo/tests/storage/testStorageBTree.py → neo/tests/storage/testStorageSQLite.py

@@ -16,15 +16,13 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 
 import unittest
-from mock import Mock
 from .testStorageDBTests import StorageDBTests
-from neo.storage.database.btree import BTreeDatabaseManager
+from neo.storage.database.sqlite import SQLiteDatabaseManager
 
-class StorageBTreeTests(StorageDBTests):
+class StorageSQLiteTests(StorageDBTests):
 
     def getDB(self, reset=0):
-        # db manager
-        db = BTreeDatabaseManager('', 0)
+        db = SQLiteDatabaseManager(':memory:', 0)
         db.setup(reset)
         return db
 

neo/tests/storage/testVerificationHandler.py

@@ -68,40 +68,6 @@ class StorageVerificationHandlerTests(NeoUnitTestBase):
         # nothing happens
         self.checkNoPacketSent(conn)
 
-    def test_07_askLastIDs(self):
-        conn = self.getClientConnection()
-        last_ptid = self.getPTID(1)
-        last_oid = self.getOID(2)
-        self.app.pt = Mock({'getID': last_ptid})
-        class DummyDM(object):
-            def getLastOID(self):
-                raise KeyError
-            getLastTID = getLastOID
-        self.app.dm = DummyDM()
-        self.verification.askLastIDs(conn)
-        oid, tid, ptid = self.checkAnswerLastIDs(conn, decode=True)
-        self.assertEqual(oid, None)
-        self.assertEqual(tid, None)
-        self.assertEqual(ptid, last_ptid)
-
-        # return value stored in db
-        conn = self.getClientConnection()
-        self.app.dm = Mock({
-            'getLastOID': last_oid,
-            'getLastTID': p64(4),
-        })
-        self.verification.askLastIDs(conn)
-        oid, tid, ptid = self.checkAnswerLastIDs(conn, decode=True)
-        self.assertEqual(oid, last_oid)
-        self.assertEqual(u64(tid), 4)
-        self.assertEqual(ptid, self.app.pt.getID())
-        call_list = self.app.dm.mockGetNamedCalls('getLastOID')
-        self.assertEqual(len(call_list), 1)
-        call_list[0].checkArgs()
-        call_list = self.app.dm.mockGetNamedCalls('getLastTID')
-        self.assertEqual(len(call_list), 1)
-        call_list[0].checkArgs()
-
     def test_08_askPartitionTable(self):
         node = self.app.nm.createStorage(
             address=("127.7.9.9", 1),

neo/tests/testProtocol.py

@@ -160,16 +160,6 @@ class ProtocolTests(NeoUnitTestBase):
         p = Packets.AskLastIDs()
         self.assertEqual(p.decode(), ())
 
-    def test_19_answerLastIDs(self):
-        oid = self.getNextTID()
-        tid = self.getNextTID()
-        ptid = self.getPTID()
-        p = Packets.AnswerLastIDs(oid, tid, ptid)
-        loid, ltid, lptid = p.decode()
-        self.assertEqual(loid, oid)
-        self.assertEqual(ltid, tid)
-        self.assertEqual(lptid, ptid)
-
     def test_20_askPartitionTable(self):
         self.assertEqual(Packets.AskPartitionTable().decode(), ())
 
@@ -638,40 +628,16 @@ class ProtocolTests(NeoUnitTestBase):
     def test_AskTIDsFrom(self):
         tid = self.getNextTID()
         tid2 = self.getNextTID()
-        p = Packets.AskTIDsFrom(tid, tid2, 1000, [5])
+        p = Packets.AskTIDsFrom(tid, tid2, 1000, 5)
         min_tid, max_tid, length, partition = p.decode()
         self.assertEqual(min_tid, tid)
         self.assertEqual(max_tid, tid2)
         self.assertEqual(length, 1000)
-        self.assertEqual(partition, [5])
+        self.assertEqual(partition, 5)
 
     def test_AnswerTIDsFrom(self):
         self._test_AnswerTIDs(Packets.AnswerTIDsFrom)
 
-    def test_AskObjectHistoryFrom(self):
-        oid = self.getOID(1)
-        min_serial = self.getNextTID()
-        max_serial = self.getNextTID()
-        length = 5
-        partition = 4
-        p = Packets.AskObjectHistoryFrom(oid, min_serial, max_serial, length,
-            partition)
-        p_oid, p_min_serial, p_max_serial, p_length, p_partition = p.decode()
-        self.assertEqual(p_oid, oid)
-        self.assertEqual(p_min_serial, min_serial)
-        self.assertEqual(p_max_serial, max_serial)
-        self.assertEqual(p_length, length)
-        self.assertEqual(p_partition, partition)
-
-    def test_AnswerObjectHistoryFrom(self):
-        object_dict = {}
-        for int_oid in xrange(4):
-            object_dict[self.getOID(int_oid)] = [self.getNextTID() \
-                for _ in xrange(5)]
-        p = Packets.AnswerObjectHistoryFrom(object_dict)
-        p_object_dict = p.decode()[0]
-        self.assertEqual(object_dict, p_object_dict)
-
     def test_AskCheckTIDRange(self):
         min_tid = self.getNextTID()
         max_tid = self.getNextTID()

neo/tests/threaded/__init__.py

@@ -32,8 +32,9 @@ from neo.lib.connection import BaseConnection, Connection
 from neo.lib.connector import SocketConnector, \
     ConnectorConnectionRefusedException, ConnectorTryAgainException
 from neo.lib.event import EventManager
-from neo.lib.protocol import CellStates, ClusterStates, NodeStates, NodeTypes
-from neo.lib.util import SOCKET_CONNECTORS_DICT, parseMasterList
+from neo.lib.protocol import CellStates, ClusterStates, NodeStates, NodeTypes, \
+    UUID_NAMESPACES, INVALID_UUID
+from neo.lib.util import SOCKET_CONNECTORS_DICT, parseMasterList, p64
 from .. import NeoTestBase, getTempDirectory, setupMySQLdb, \
     ADDRESS_TYPE, IP_VERSION_FORMAT_DICT, DB_PREFIX, DB_USER
 
@@ -293,38 +294,18 @@ class StorageApplication(ServerNode, neo.storage.app.Application):
             pass
 
     def switchTables(self):
-        adapter = self._init_args['getAdapter']
-        dm = self.dm
-        if adapter == 'BTree':
-            dm._obj, dm._tobj = dm._tobj, dm._obj
-            dm._trans, dm._ttrans = dm._ttrans, dm._trans
-            uncommitted_data = dm._uncommitted_data
-            for checksum, (_, _, index) in dm._data.iteritems():
-                uncommitted_data[checksum] = len(index)
-                index.clear()
-        elif adapter == 'MySQL':
-            q = dm.query
-            dm.begin()
+        with self.dm as q:
             for table in ('trans', 'obj'):
-                q('RENAME TABLE %s to tmp' % table)
-                q('RENAME TABLE t%s to %s' % (table, table))
-                q('RENAME TABLE tmp to t%s' % table)
-            dm.commit()
-        else:
-            assert False
+                q('ALTER TABLE %s RENAME TO tmp' % table)
+                q('ALTER TABLE t%s RENAME TO %s' % (table, table))
+                q('ALTER TABLE tmp RENAME TO t%s' % table)
 
     def getDataLockInfo(self):
-        adapter = self._init_args['getAdapter']
         dm = self.dm
-        if adapter == 'BTree':
-            checksum_dict = dict((x, x) for x in dm._data)
-        elif adapter == 'MySQL':
         checksum_dict = dict(dm.query("SELECT id, hash FROM data"))
-        else:
-            assert False
         assert set(dm._uncommitted_data).issubset(checksum_dict)
         get = dm._uncommitted_data.get
-        return dict((v, get(k, 0)) for k, v in checksum_dict.iteritems())
+        return dict((str(v), get(k, 0)) for k, v in checksum_dict.iteritems())
 
 class ClientApplication(Node, neo.client.app.Application):
 
@@ -406,13 +387,15 @@ class Patch(object):
 
 class ConnectionFilter(object):
 
+    filtered_count = 0
+
     def __init__(self, *conns):
         self.filter_dict = {}
         self.lock = threading.Lock()
         self.conn_list = [(conn, self._patch(conn)) for conn in conns]
 
     def _patch(self, conn):
-        assert '_addPacket' not in conn.__dict__
+        assert '_addPacket' not in conn.__dict__, "already patched"
         lock = self.lock
         filter_dict = self.filter_dict
         orig = conn.__class__._addPacket
@@ -423,6 +406,7 @@ class ConnectionFilter(object):
                 if not queue:
                     for filter in filter_dict:
                         if filter(conn, packet):
+                            self.filtered_count += 1
                             break
                     else:
                         return orig(conn, packet)
@@ -551,8 +535,8 @@ class NEOCluster(object):
         SocketConnector.send = cls.SocketConnector_send
         Storage.setupLog = setupLog
 
-    def __init__(self, master_count=1, partitions=1, replicas=0,
-                       adapter=os.getenv('NEO_TESTS_ADAPTER', 'BTree'),
+    def __init__(self, master_count=1, partitions=1, replicas=0, upstream=None,
+                       adapter=os.getenv('NEO_TESTS_ADAPTER', 'SQLite'),
                        storage_count=None, db_list=None, clear_databases=True,
                        db_user=DB_USER, db_password='', verbose=None):
         if verbose is not None:
@@ -570,6 +554,10 @@ class NEOCluster(object):
         weak_self = weakref.proxy(self)
         kw = dict(cluster=weak_self, getReplicas=replicas, getAdapter=adapter,
                   getPartitions=partitions, getReset=clear_databases)
+        if upstream is not None:
+          self.upstream = weakref.proxy(upstream)
+          kw.update(getUpstreamCluster=upstream.name,
+                    getUpstreamMasters=parseMasterList(upstream.master_nodes))
         self.master_list = [MasterApplication(address=x, **kw)
                             for x in master_list]
         if db_list is None:
@@ -581,8 +569,8 @@ class NEOCluster(object):
         if adapter == 'MySQL':
             setupMySQLdb(db_list, db_user, db_password, clear_databases)
             db = '%s:%s@%%s' % (db_user, db_password)
-        elif adapter == 'BTree':
-            db = '%s'
+        elif adapter == 'SQLite':
+            db = os.path.join(getTempDirectory(), '%s.sqlite')
         else:
             assert False, adapter
         self.storage_list = [StorageApplication(getDatabase=db % x, **kw)
@@ -607,6 +595,11 @@ class NEOCluster(object):
         return admin
     ###
 
+    @property
+    def primary_master(self):
+        master, = [master for master in self.master_list if master.primary]
+        return master
+
     def reset(self, clear_database=False):
         for node_type in 'master', 'storage', 'admin':
             kw = {}
@@ -635,7 +628,7 @@ class NEOCluster(object):
             self._startCluster()
             self.tic()
         state = self.neoctl.getClusterState()
-        assert state == ClusterStates.RUNNING, state
+        assert state in (ClusterStates.RUNNING, ClusterStates.BACKINGUP), state
         self.enableStorageList(storage_list)
 
     def _startCluster(self):
@@ -644,6 +637,7 @@ class NEOCluster(object):
         except RuntimeError:
             self.tic()
             if self.neoctl.getClusterState() not in (
+                      ClusterStates.BACKINGUP,
                       ClusterStates.RUNNING,
                       ClusterStates.VERIFYING,
                   ):
@@ -704,7 +698,7 @@ class NEOCluster(object):
             self.client.setPoll(True)
         return Storage.Storage(None, self.name, _app=self.client, **kw)
 
-    def populate(self, dummy_zodb=None, random=random):
+    def importZODB(self, dummy_zodb=None, random=random):
         if dummy_zodb is None:
             from ..stat_zodb import PROD1
             dummy_zodb = PROD1(random)
@@ -713,6 +707,20 @@ class NEOCluster(object):
         return lambda count: self.getZODBStorage().importFrom(
             as_storage(count), preindex=preindex)
 
+    def populate(self, transaction_list, tid=lambda i: p64(i+1),
+                                         oid=lambda i: p64(i+1)):
+        storage = self.getZODBStorage()
+        tid_dict = {}
+        for i, oid_list in enumerate(transaction_list):
+            txn = transaction.Transaction()
+            storage.tpc_begin(txn, tid(i))
+            for o in oid_list:
+                storage.store(p64(o), tid_dict.get(o), repr((i, o)), '', txn)
+            storage.tpc_vote(txn)
+            i = storage.tpc_finish(txn)
+            for o in oid_list:
+                tid_dict[o] = i
+
     def getTransaction(self):
         txn = transaction.TransactionManager()
         return txn, self.db.open(transaction_manager=txn)
@@ -774,3 +782,28 @@ class NEOThreadedTest(NeoTestBase):
                 etype, value, tb = self.__exc_info
                 del self.__exc_info
                 raise etype, value, tb
+
+
+def predictable_random(seed=None):
+    # Because we have 2 running threads when client works, we can't
+    # patch neo.client.pool (and cluster should have 1 storage).
+    from neo.master import backup_app
+    from neo.storage import replicator
+    def decorator(wrapped):
+        def wrapper(*args, **kw):
+            s = repr(time.time()) if seed is None else seed
+            neo.lib.logging.info("using seed %r", s)
+            r = random.Random(s)
+            try:
+                MasterApplication.getNewUUID = lambda self, node_type: (
+                    super(MasterApplication, self).getNewUUID(node_type)
+                    if node_type == NodeTypes.CLIENT else
+                    UUID_NAMESPACES[node_type] + ''.join(
+                    chr(r.randrange(256)) for _ in xrange(15)))
+                backup_app.random = replicator.random = r
+                return wrapped(*args, **kw)
+            finally:
+                del MasterApplication.getNewUUID
+                backup_app.random = replicator.random = random
+        return wraps(wrapped)(wrapper)
+    return decorator

neo/tests/threaded/test.py

@@ -26,8 +26,7 @@ from neo.storage.transactions import TransactionManager, \
     DelayedError, ConflictError
 from neo.lib.connection import MTClientConnection
 from neo.lib.protocol import NodeStates, Packets, ZERO_TID
-from . import NEOCluster, NEOThreadedTest, \
-    Patch, ConnectionFilter
+from . import NEOCluster, NEOThreadedTest, Patch
 from neo.lib.util import makeChecksum
 from neo.client.pool import CELL_CONNECTED, CELL_GOOD
 

neo/tests/threaded/testReplication.py

+#
+# Copyright (c) 2011 Nexedi SARL and Contributors. All Rights Reserved.
+#                    Julien Muchembled <jm@nexedi.com>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+import random
+import sys
+import time
+import threading
+import transaction
+import unittest
+import neo.lib
+from neo.storage.transactions import TransactionManager, \
+    DelayedError, ConflictError
+from neo.lib.connection import MTClientConnection
+from neo.lib.protocol import CellStates, ClusterStates, NodeStates, Packets, \
+    ZERO_OID, ZERO_TID, MAX_TID
+from . import NEOCluster, NEOThreadedTest, Patch, predictable_random
+from neo.client.pool import CELL_CONNECTED, CELL_GOOD
+
+
+class ReplicationTests(NEOThreadedTest):
+
+    def checksumPartition(self, storage, partition):
+        dm = storage.dm
+        args = ZERO_TID, MAX_TID, None, partition
+        return dm.checkTIDRange(*args), dm.checkSerialRange(ZERO_TID, *args)
+
+    def checkPartitionReplicated(self, source, destination, partition):
+        self.assertEqual(self.checksumPartition(source, partition),
+                         self.checksumPartition(destination, partition))
+
+    def checkBackup(self, cluster):
+        upstream_pt = cluster.upstream.primary_master.pt
+        pt = cluster.primary_master.pt
+        np = pt.getPartitions()
+        self.assertEqual(np, upstream_pt.getPartitions())
+        checked = 0
+        source_dict = dict((x.uuid, x) for x in cluster.upstream.storage_list)
+        for storage in cluster.storage_list:
+            self.assertEqual(np, storage.pt.getPartitions())
+            for partition in pt.getAssignedPartitionList(storage.uuid):
+                cell_list = upstream_pt.getCellList(partition, readable=True)
+                source = source_dict[random.choice(cell_list).getUUID()]
+                self.checkPartitionReplicated(source, storage, partition)
+                checked += 1
+        return checked
+
+    def testBackupNormalCase(self):
+        upstream = NEOCluster(partitions=7, replicas=1, storage_count=3)
+        try:
+            upstream.start()
+            importZODB = upstream.importZODB()
+            importZODB(3)
+            upstream.client.setPoll(0)
+            backup = NEOCluster(partitions=7, replicas=1, storage_count=5,
+                                upstream=upstream)
+            try:
+                backup.start()
+                # Initialize & catch up.
+                backup.neoctl.setClusterState(ClusterStates.STARTING_BACKUP)
+                backup.tic()
+                self.assertEqual(14, self.checkBackup(backup))
+                # Normal case, following upstream cluster closely.
+                importZODB(17)
+                upstream.client.setPoll(0)
+                backup.tic()
+                self.assertEqual(14, self.checkBackup(backup))
+            # Check that a backup cluster can be restarted.
+            finally:
+                backup.stop()
+            backup.reset()
+            try:
+                backup.start()
+                self.assertEqual(backup.neoctl.getClusterState(),
+                                 ClusterStates.BACKINGUP)
+                importZODB(17)
+                upstream.client.setPoll(0)
+                backup.tic()
+                self.assertEqual(14, self.checkBackup(backup))
+                # Stop backing up, nothing truncated.
+                backup.neoctl.setClusterState(ClusterStates.STOPPING_BACKUP)
+                backup.tic()
+                self.assertEqual(14, self.checkBackup(backup))
+                self.assertEqual(backup.neoctl.getClusterState(),
+                                 ClusterStates.RUNNING)
+            finally:
+                backup.stop()
+        finally:
+            upstream.stop()
+
+    @predictable_random()
+    def testBackupNodeLost(self):
+        """Check backup cluster can recover after random connection loss
+
+        - backup master disconnected from upstream master
+        - primary storage disconnected from backup master
+        - non-primary storage disconnected from backup master
+        """
+        from neo.master.backup_app import random
+        def fetchObjects(orig, min_tid=None, min_oid=ZERO_OID):
+            if min_tid is None:
+                counts[0] += 1
+                if counts[0] > 1:
+                    orig.im_self.app.master_conn.close()
+            return orig(min_tid, min_oid)
+        def onTransactionCommitted(orig, txn):
+            counts[0] += 1
+            if counts[0] > 1:
+                node_list = orig.im_self.nm.getClientList(only_identified=True)
+                node_list.remove(txn.getNode())
+                node_list[0].getConnection().close()
+            return orig(txn)
+        upstream = NEOCluster(partitions=4, replicas=0, storage_count=1)
+        try:
+            upstream.start()
+            importZODB = upstream.importZODB(random=random)
+            backup = NEOCluster(partitions=4, replicas=2, storage_count=4,
+                                upstream=upstream)
+            try:
+                backup.start()
+                backup.neoctl.setClusterState(ClusterStates.STARTING_BACKUP)
+                backup.tic()
+                storage_list = [x.uuid for x in backup.storage_list]
+                slave = set(xrange(len(storage_list))).difference
+                for event in xrange(10):
+                    counts = [0]
+                    if event == 5:
+                        p = Patch(upstream.master.tm,
+                            _on_commit=onTransactionCommitted)
+                    else:
+                        primary_dict = {}
+                        for k, v in sorted(backup.master.backup_app
+                                           .primary_partition_dict.iteritems()):
+                            primary_dict.setdefault(storage_list.index(v._uuid),
+                                                    []).append(k)
+                        if event % 2:
+                            storage = slave(primary_dict).pop()
+                        else:
+                            storage, partition_list = primary_dict.popitem()
+                        # Populate until the found storage performs
+                        # a second replication partially and aborts.
+                        p = Patch(backup.storage_list[storage].replicator,
+                                  fetchObjects=fetchObjects)
+                    try:
+                        importZODB(lambda x: counts[0] > 1)
+                    finally:
+                        del p
+                    upstream.client.setPoll(0)
+                    backup.tic()
+                    self.assertEqual(12, self.checkBackup(backup))
+            finally:
+                backup.stop()
+        finally:
+            upstream.stop()
+
+    def testReplicationAbortedBySource(self):
+        """
+        Check that a feeding node aborts replication when its partition is
+        dropped, and that the out-of-date node finishes to replicate from
+        another source.
+        Here are the different states of partitions over time:
+          pt: 0: U|U|U
+          pt: 0: UO|UO|UO
+          pt: 0: FOO|UO.|U.O # node 1 replicates from node 0
+          pt: 0: .OU|UO.|U.O # here node 0 lost partition 0
+                             # and node 1 must switch to node 2
+          pt: 0: .OU|UO.|U.U
+          pt: 0: .OU|UU.|U.U
+          pt: 0: .UU|UU.|U.U
+        """
+        def connected(orig, *args, **kw):
+            patch[0] = s1.filterConnection(s0)
+            patch[0].add(delayAskFetch,
+                Patch(s0.dm, changePartitionTable=changePartitionTable))
+            return orig(*args, **kw)
+        def delayAskFetch(conn, packet):
+            return isinstance(packet, delayed) and packet.decode()[0] == offset
+        def changePartitionTable(orig, ptid, cell_list):
+            if (offset, s0.uuid, CellStates.DISCARDED) in cell_list:
+                patch[0].remove(delayAskFetch)
+                # XXX: this is currently not done by
+                #      default for performance reason
+                orig.im_self.dropPartitions((offset,))
+            return orig(ptid, cell_list)
+        cluster = NEOCluster(partitions=3, replicas=1, storage_count=3)
+        s0, s1, s2 = cluster.storage_list
+        for delayed in Packets.AskFetchTransactions, Packets.AskFetchObjects:
+            try:
+                cluster.start([s0])
+                cluster.populate([range(6)] * 3)
+                cluster.client.setPoll(0)
+                s1.start()
+                s2.start()
+                cluster.tic()
+                cluster.neoctl.enableStorageList([s1.uuid, s2.uuid])
+                offset, = [offset for offset, row in enumerate(
+                                      cluster.master.pt.partition_list)
+                                  for cell in row if cell.isFeeding()]
+                patch = [Patch(s1.replicator, fetchTransactions=connected)]
+                try:
+                    cluster.tic()
+                    self.assertEqual(1, patch[0].filtered_count)
+                    patch[0]()
+                finally:
+                    del patch[:]
+                cluster.tic()
+                self.checkPartitionReplicated(s1, s2, offset)
+            finally:
+                cluster.stop()
+            cluster.reset(True)
+
+
+if __name__ == "__main__":
+    unittest.main()

setup.py

@@ -29,7 +29,7 @@ extras_require = {
     'client': ['ZODB3'], # ZODB3 >= 3.10
     'ctl': [],
     'master': [],
-    'storage-btree': ['ZODB3'],
+    'storage-sqlite': [],
     'storage-mysqldb': ['MySQL-python'],
 }
 extras_require['tests'] = ['zope.testing', 'psutil',

tools/test_bot

@@ -78,13 +78,14 @@ def main():
                 if subprocess.call((os.path.join(bin, 'buildout'), '-v'),
                                    cwd=test_home):
                     continue
-                title = '[%s:%s-g%s:%s]' % (branch,
+                for backend in 'SQLite', 'MySQL':
+                    os.environ['NEO_TESTS_ADAPTER'] = backend
+                    title = '[%s:%s-g%s:%s:%s]' % (branch,
                         git('rev-list', '--topo-order', '--count', revision),
-                  revision[:7], os.path.basename(test_home))
+                        revision[:7], os.path.basename(test_home), backend)
                     if tests:
                         subprocess.call([os.path.join(bin, 'neotestrunner'),
-                                     '-' + tests, '--title',
-                                     'NEO tests ' + title,
+                            '-' + tests, '--title', 'NEO tests ' + title,
                             ] + sys.argv[1:arg_count])
                     if 'm' in tasks:
                         subprocess.call([os.path.join(bin, 'python'),