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#
# Copyright (C) 2006-2009 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 logging
from neo.protocol import MASTER_NODE_TYPE, STORAGE_NODE_TYPE, CLIENT_NODE_TYPE, \
RUNNING_STATE, BROKEN_STATE, TEMPORARILY_DOWN_STATE, DOWN_STATE, \
ADMIN_NODE_TYPE
from neo.master.handler import MasterEventHandler
from neo.exception import VerificationFailure, ElectionFailure
from neo.protocol import Packet, INVALID_UUID
from neo.util import dump
from neo.node import ClientNode, StorageNode, MasterNode, AdminNode
class VerificationEventHandler(MasterEventHandler):
"""This class deals with events for a verification phase."""
def connectionClosed(self, conn):
uuid = conn.getUUID()
if uuid is not None:
app = self.app
node = app.nm.getNodeByUUID(uuid)
if node.getState() == RUNNING_STATE:
node.setState(TEMPORARILY_DOWN_STATE)
app.broadcastNodeInformation(node)
if node.getNodeType() in (CLIENT_NODE_TYPE, ADMIN_NODE_TYPE):
# If this node is a client, just forget it.
app.nm.remove(node)
elif node.getNodeType() == STORAGE_NODE_TYPE:
if not app.pt.operational():
# Catastrophic.
raise VerificationFailure, 'cannot continue verification'
MasterEventHandler.connectionClosed(self, conn)
def timeoutExpired(self, conn):
uuid = conn.getUUID()
if uuid is not None:
app = self.app
node = app.nm.getNodeByUUID(uuid)
if node.getState() == RUNNING_STATE:
node.setState(TEMPORARILY_DOWN_STATE)
app.broadcastNodeInformation(node)
if node.getNodeType() in (CLIENT_NODE_TYPE, ADMIN_NODE_TYPE):
# If this node is a client, just forget it.
app.nm.remove(node)
elif node.getNodeType() == STORAGE_NODE_TYPE:
if not app.pt.operational():
# Catastrophic.
raise VerificationFailure, 'cannot continue verification'
MasterEventHandler.timeoutExpired(self, conn)
def peerBroken(self, conn):
uuid = conn.getUUID()
if uuid is not None:
app = self.app
node = app.nm.getNodeByUUID(uuid)
if node.getState() != BROKEN_STATE:
node.setState(BROKEN_STATE)
app.broadcastNodeInformation(node)
if node.getNodeType() in (CLIENT_NODE_TYPE, ADMIN_NODE_TYPE):
# If this node is a client, just forget it.
app.nm.remove(node)
elif node.getNodeType() == STORAGE_NODE_TYPE:
cell_list = app.pt.dropNode(node)
ptid = app.getNextPartitionTableID()
app.broadcastPartitionChanges(ptid, cell_list)
if not app.pt.operational():
# Catastrophic.
raise VerificationFailure, 'cannot continue verification'
MasterEventHandler.peerBroken(self, conn)
def packetReceived(self, conn, packet):
MasterEventHandler.packetReceived(self, conn, packet)
def handleRequestNodeIdentification(self, conn, packet, node_type,
uuid, ip_address, port, name):
app = self.app
if node_type not in (MASTER_NODE_TYPE, STORAGE_NODE_TYPE, ADMIN_NODE_TYPE):
logging.info('reject a connection from a client')
conn.addPacket(Packet().notReady(packet.getId(), 'retry later'))
conn.abort()
return
if name != app.name:
logging.error('reject an alien cluster')
conn.addPacket(Packet().protocolError(packet.getId(),
'invalid cluster name'))
conn.abort()
return
# Here are many situations. In principle, a node should be identified by
# an UUID, since an UUID never change when moving a storage node to a different
# server, and an UUID always changes for a master node and a client node whenever
# it restarts, so more reliable than a server address.
#
# However, master nodes can be known only as the server addresses. And, a node
# may claim a server address used by another node.
addr = (ip_address, port)
if not app.isValidUUID(uuid, addr):
# Here we have an UUID conflict, assume that's a new node
node = None
else:
# First, get the node by the UUID.
node = app.nm.getNodeByUUID(uuid)
if node is None:
# generate a new uuid for this node
while not app.isValidUUID(uuid, addr):
uuid = app.getNewUUID(node_type)
# If nothing is present, try with the server address.
node = app.nm.getNodeByServer(addr)
if node is None:
# Nothing is found. So this must be the first time that this node
# connected to me.
if node_type == MASTER_NODE_TYPE:
node = MasterNode(server = addr, uuid = uuid)
elif node_type == ADMIN_NODE_TYPE:
node = AdminNode(uuid = uuid)
else:
node = StorageNode(server = addr, uuid = uuid)
app.nm.add(node)
app.broadcastNodeInformation(node)
else:
# Otherwise, I know it only by the server address or the same server
# address but with a different UUID.
if node.getUUID() is None:
# This must be a master node.
if node.getNodeType() != MASTER_NODE_TYPE or node_type != MASTER_NODE_TYPE:
# Error. This node uses the same server address as a master
# node.
conn.addPacket(Packet().protocolError(packet.getId(),
'invalid server address'))
conn.abort()
return
node.setUUID(uuid)
if node.getState() != RUNNING_STATE:
node.setState(RUNNING_STATE)
app.broadcastNodeInformation(node)
else:
# This node has a different UUID.
if node.getState() == RUNNING_STATE:
# If it is still running, reject this node.
conn.addPacket(Packet().protocolError(packet.getId(),
'invalid server address'))
conn.abort()
return
else:
# Otherwise, forget the old one.
node.setState(BROKEN_STATE)
app.broadcastNodeInformation(node)
# And insert a new one.
node.setUUID(uuid)
node.setState(RUNNING_STATE)
app.broadcastNodeInformation(node)
else:
# I know this node by the UUID.
if node.getServer() != addr:
# This node has a different server address.
if node.getState() == RUNNING_STATE:
# If it is still running, reject this node.
conn.addPacket(Packet().protocolError(packet.getId(),
'invalid server address'))
conn.abort()
return
else:
# Otherwise, forget the old one.
node.setState(BROKEN_STATE)
app.broadcastNodeInformation(node)
# And insert a new one.
node.setServer(addr)
node.setState(RUNNING_STATE)
app.broadcastNodeInformation(node)
else:
# If this node is broken, reject it. Otherwise, assume that it is
# working again.
if node.getState() == BROKEN_STATE:
p = Packet()
p.brokenNodeDisallowedError(packet.getId(), 'go away')
conn.addPacket(p)
conn.abort()
return
else:
node.setUUID(uuid)
node.setState(RUNNING_STATE)
app.broadcastNodeInformation(node)
conn.setUUID(uuid)
p = Packet()
p.acceptNodeIdentification(packet.getId(), MASTER_NODE_TYPE,
app.uuid, app.server[0], app.server[1],
app.num_partitions, app.num_replicas, uuid)
conn.addPacket(p)
# Next, the peer should ask a primary master node.
conn.expectMessage()
def handleAskPrimaryMaster(self, conn, packet):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
return
app = self.app
# Merely tell the peer that I am the primary master node.
# It is not necessary to send known master nodes, because
# I must send all node information immediately.
p = Packet()
p.answerPrimaryMaster(packet.getId(), app.uuid, [])
conn.addPacket(p)
# Send the information.
node_list = []
for n in app.nm.getNodeList():
try:
ip_address, port = n.getServer()
except TypeError:
ip_address, port = '0.0.0.0', 0
node_list.append((n.getNodeType(), ip_address, port,
n.getUUID() or INVALID_UUID, n.getState()))
if len(node_list) == 10000:
# Ugly, but it is necessary to split a packet, if it is too big.
p = Packet()
p.notifyNodeInformation(conn.getNextId(), node_list)
conn.addPacket(p)
del node_list[:]
p = Packet()
p.notifyNodeInformation(conn.getNextId(), node_list)
conn.addPacket(p)
# If this is a storage node or an admin node, send the partition table.
node = app.nm.getNodeByUUID(uuid)
if node.getNodeType() in (STORAGE_NODE_TYPE, ADMIN_NODE_TYPE):
# Split the packet if too huge.
p = Packet()
row_list = []
for offset in xrange(app.num_partitions):
row_list.append((offset, app.pt.getRow(offset)))
if len(row_list) == 1000:
p.sendPartitionTable(conn.getNextId(), app.lptid, row_list)
conn.addPacket(p)
del row_list[:]
if len(row_list) != 0:
p.sendPartitionTable(conn.getNextId(), app.lptid, row_list)
conn.addPacket(p)
def handleAnnouncePrimaryMaster(self, conn, packet):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
return
# I am also the primary... So restart the election.
raise ElectionFailure, 'another primary arises'
def handleReelectPrimaryMaster(self, conn, packet):
raise ElectionFailure, 'reelection requested'
def handleNotifyNodeInformation(self, conn, packet, node_list):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
return
app = self.app
for node_type, ip_address, port, uuid, state in node_list:
if node_type in (CLIENT_NODE_TYPE, ADMIN_NODE_TYPE):
# No interest.
continue
if uuid == INVALID_UUID:
# No interest.
continue
if app.uuid == uuid:
# This looks like me...
if state == RUNNING_STATE:
# Yes, I know it.
continue
else:
# What?! What happened to me?
raise RuntimeError, 'I was told that I am bad'
addr = (ip_address, port)
node = app.nm.getNodeByUUID(uuid)
if node is None:
node = app.nm.getNodeByServer(addr)
if node is None:
# I really don't know such a node. What is this?
continue
else:
if node.getServer() != addr:
# This is different from what I know.
continue
if node.getState() == state:
# No change. Don't care.
continue
if state == RUNNING_STATE:
# No problem.
continue
# Something wrong happened possibly. Cut the connection to this node,
# if any, and notify the information to others.
# XXX this can be very slow.
for c in app.em.getConnectionList():
if c.getUUID() == uuid:
c.close()
node.setState(state)
app.broadcastNodeInformation(node)
def handleAnswerLastIDs(self, conn, packet, loid, ltid, lptid):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
return
app = self.app
node = app.nm.getNodeByUUID(uuid)
if node.getNodeType() != STORAGE_NODE_TYPE:
self.handleUnexpectedPacket(conn, packet)
return
# If I get a bigger value here, it is dangerous.
if app.loid < loid or app.ltid < ltid or app.lptid < lptid:
logging.critical('got later information in verification')
raise VerificationFailure
def handleAnswerPartitionTable(self, conn, packet, ptid, cell_list):
# Ignore this packet.
pass
def handleAnswerUnfinishedTransactions(self, conn, packet, tid_list):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
return
logging.info('got unfinished transactions %s from %s:%d',
tid_list, *(conn.getAddress()))
app = self.app
node = app.nm.getNodeByUUID(uuid)
if node.getNodeType() != STORAGE_NODE_TYPE:
self.handleUnexpectedPacket(conn, packet)
return
if app.asking_uuid_dict.get(uuid, True):
# No interest.
return
app.unfinished_tid_set.update(tid_list)
app.asking_uuid_dict[uuid] = True
def handleAnswerTransactionInformation(self, conn, packet, tid,
user, desc, ext, oid_list):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
return
logging.info('got OIDs %s for %s from %s:%d',
oid_list, tid, *(conn.getAddress()))
app = self.app
node = app.nm.getNodeByUUID(uuid)
if node.getNodeType() != STORAGE_NODE_TYPE:
self.handleUnexpectedPacket(conn, packet)
return
if app.asking_uuid_dict.get(uuid, True):
# No interest.
return
oid_set = set(oid_list)
if app.unfinished_oid_set is None:
# Someone does not agree.
pass
elif len(app.unfinished_oid_set) == 0:
# This is the first answer.
app.unfinished_oid_set.update(oid_set)
elif app.unfinished_oid_set != oid_set:
app.unfinished_oid_set = None
app.asking_uuid_dict[uuid] = True
def handleTidNotFound(self, conn, packet, message):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
return
logging.info('TID not found: %s', message)
app = self.app
node = app.nm.getNodeByUUID(uuid)
if node.getNodeType() != STORAGE_NODE_TYPE:
self.handleUnexpectedPacket(conn, packet)
return
if app.asking_uuid_dict.get(uuid, True):
# No interest.
return
app.unfinished_oid_set = None
app.asking_uuid_dict[uuid] = True
def handleAnswerObjectPresent(self, conn, packet, oid, tid):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
return
logging.info('object %s:%s found', dump(oid), dump(tid))
app = self.app
node = app.nm.getNodeByUUID(uuid)
if node.getNodeType() != STORAGE_NODE_TYPE:
self.handleUnexpectedPacket(conn, packet)
return
if app.asking_uuid_dict.get(uuid, True):
# No interest.
return
app.asking_uuid_dict[uuid] = True
def handleOidNotFound(self, conn, packet, message):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
return
logging.info('OID not found: %s', message)
app = self.app
node = app.nm.getNodeByUUID(uuid)
if node.getNodeType() != STORAGE_NODE_TYPE:
self.handleUnexpectedPacket(conn, packet)
return
if app.asking_uuid_dict.get(uuid, True):
# No interest.
return
app.object_present = False
app.asking_uuid_dict[uuid] = True