# # 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. from neo import logging from neo.handler import EventHandler from neo import protocol from neo.protocol import RUNNING_STATE, BROKEN_STATE, CLIENT_NODE_TYPE, \ DOWN_STATE, TEMPORARILY_DOWN_STATE, HIDDEN_STATE from neo.util import dump from neo.node import MasterNode, StorageNode, ClientNode from neo.exception import PrimaryFailure, OperationFailure class BaseStorageHandler(EventHandler): """This class implements a generic part of the event handlers.""" pass class BaseMasterHandler(BaseStorageHandler): def connectionLost(self, conn, new_state): raise PrimaryFailure('connection lost') def handleReelectPrimaryMaster(self, conn, packet): raise PrimaryFailure('re-election occurs') def handleNotifyClusterInformation(self, conn, packet, state): logging.error('ignoring notify cluster information in %s' % self.__class__.__name__) def handleNotifyLastOID(self, conn, packet, oid): self.app.loid = oid self.app.dm.setLastOID(oid) def handleNotifyNodeInformation(self, conn, packet, node_list): """Store information on nodes, only if this is sent by a primary master node.""" self.app.nm.update(node_list) for node_type, addr, uuid, state in node_list: if uuid == self.app.uuid: # This is me, do what the master tell me logging.info("I was told I'm %s" %(state)) if state in (DOWN_STATE, TEMPORARILY_DOWN_STATE, BROKEN_STATE): conn.close() self.app.shutdown() elif state == HIDDEN_STATE: raise OperationFailure class BaseClientAndStorageOperationHandler(BaseStorageHandler): """ Accept requests common to client and storage nodes """ def handleAskTIDs(self, conn, packet, 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') app = self.app if partition == protocol.INVALID_PARTITION: # Collect all usable partitions for me. getCellList = app.pt.getCellList partition_list = [] for offset in xrange(app.pt.getPartitions()): for cell in getCellList(offset, readable=True): if cell.getUUID() == app.uuid: partition_list.append(offset) break else: partition_list = [partition] tid_list = app.dm.getTIDList(first, last - first, app.pt.getPartitions(), partition_list) conn.answer(protocol.answerTIDs(tid_list), packet.getId()) def handleAskObjectHistory(self, conn, packet, oid, first, last): if first >= last: raise protocol.ProtocolError( 'invalid offsets') app = self.app history_list = app.dm.getObjectHistory(oid, first, last - first) if history_list is None: history_list = [] p = protocol.answerObjectHistory(oid, history_list) conn.answer(p, packet.getId()) def handleAskTransactionInformation(self, conn, packet, tid): app = self.app t = app.dm.getTransaction(tid) if t is None: p = protocol.tidNotFound('%s does not exist' % dump(tid)) else: p = protocol.answerTransactionInformation(tid, t[1], t[2], t[3], t[0]) conn.answer(p, packet.getId()) def handleAskObject(self, conn, packet, oid, serial, tid): app = self.app if oid in app.load_lock_dict: # Delay the response. app.queueEvent(self.handleAskObject, conn, packet, oid, serial, tid) return o = app.dm.getObject(oid, serial, tid) if o is not None: serial, next_serial, compression, checksum, data = o logging.debug('oid = %s, serial = %s, next_serial = %s', dump(oid), dump(serial), dump(next_serial)) p = protocol.answerObject(oid, serial, next_serial, compression, checksum, data) else: logging.debug('oid = %s not found', dump(oid)) p = protocol.oidNotFound('%s does not exist' % dump(oid)) conn.answer(p, packet.getId())