def __load(self, filename):
try:
with open(filename, 'rb') as file:
pgctl_data = file.read(PG_CONTROL_SIZE)
self.systemidentifier, = struct.unpack_from('Q', pgctl_data, memoffset['ControlFileData.system_identifier'])
self.catalog_version_no, = struct.unpack_from('I', pgctl_data, memoffset['ControlFileData.catalog_version_no'])
self.dbstate, = struct.unpack_from(pgstruct.get_type_format('DBState'), pgctl_data, memoffset['ControlFileData.state'])
self.checkPoint, = struct.unpack_from('Q', pgctl_data, memoffset['ControlFileData.checkPoint'])
self.minRecoveryPoint, = struct.unpack_from('Q', pgctl_data, memoffset['ControlFileData.minRecoveryPoint'])
self.minRecoveryPointTLI, = struct.unpack_from('I', pgctl_data, memoffset['ControlFileData.minRecoveryPointTLI'])
self.checkPointCopy = CheckPoint(pgctl_data, memoffset['ControlFileData.checkPointCopy'])
self.xlog_blcksz, = struct.unpack_from('I', pgctl_data, memoffset['ControlFileData.xlog_blcksz'])
self.xlog_seg_size, = struct.unpack_from('I', pgctl_data, memoffset['ControlFileData.xlog_seg_size'])
self.blcksz, = struct.unpack_from('I', pgctl_data, memoffset['ControlFileData.blcksz'])
self.relseg_size, = struct.unpack_from('I', pgctl_data, memoffset['ControlFileData.relseg_size'])
self.nameDataLen, = struct.unpack_from('I', pgctl_data, memoffset['ControlFileData.nameDataLen'])
self.float8ByVal, = struct.unpack_from(pgstruct.get_type_format('bool'), pgctl_data, memoffset['ControlFileData.float8ByVal'])
self.float4ByVal, = struct.unpack_from(pgstruct.get_type_format('bool'), pgctl_data, memoffset['ControlFileData.float4ByVal'])
self.crc, = struct.unpack_from('I', pgctl_data, memoffset['ControlFileData.crc'])
crcdatas = []
crcdatas.append((pgctl_data, memoffset['ControlFileData.crc']));
if not upgcrc.crceq(crcdatas, self.crc):
logger.error('pg_control has invalid CRC')
raise UPgException('pg_control has invalid CRC')
except IOError:
logger.error("Error in reading control file!")
raise
def loadrelmap(self, spacenode=None, dbnode=None):
assert not dbnode and not spacenode or dbnode and spacenode
if not dbnode and not spacenode:
mapfile = '%s/global/%s'%(self.datadir, Catalog.RELMAPPER_FILENAME)
else:
dbpath = Catalog.getdbpath(self.datadir, spacenode, dbnode, self.GLOBALTABLESPACE_OID,
self.DEFAULTTABLESPACE_OID, self.pg_majorversion, self.catalog_version_no)
mapfile = '%s/%s'%(dbpath, Catalog.RELMAPPER_FILENAME)
try:
with open(mapfile, 'r') as file:
data = file.read(pgstruct.typesize['RelMapFile'])
except IOError as e:
logger.error('could not read relation mapping file %s'%(mapfile))
raise UPgException('could not read relation mapping file')
if len(data) != pgstruct.typesize['RelMapFile']:
logger.error('could not read relation mapping file %s'%(mapfile))
raise UPgException('could not read relation mapping file')
magic = pgstruct.getuint(data, memoffset['RelMapFile.magic'])
mappingnum = pgstruct.getuint(data, memoffset['RelMapFile.num_mappings'])
crc = pgstruct.getuint(data, memoffset['RelMapFile.crc'])
if magic != self.RELMAPPER_FILEMAGIC or mappingnum > self.max_mappings:
logger.error('mapping file %s contains invalid data'%(mapfile))
raise UPgException('mapping file contains invalid data')
crcdatas = []
crcdatas.append((data, memoffset['RelMapFile.crc']));
if not upgcrc.crceq(crcdatas, crc):
logger.error('mapping file %s contains invalid crc'%(mapfile))
raise UPgException('mapping file contains invalid crc')
result = {}
entrysize = pgstruct.typesize['RelMapping']
for i in range(mappingnum):
mapoid = pgstruct.getuint(data, memoffset['RelMapFile.mappings'] + i * entrysize+memoffset['RelMapping.mapoid'])
mapfilenode = pgstruct.getuint(data, memoffset['RelMapFile.mappings'] + i * entrysize+memoffset['RelMapping.mapfilenode'])
result[mapoid] = mapfilenode
return result
