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Commit a8b6c61d authored by Jeremy Hylton's avatar Jeremy Hylton
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Code cleanup. 

Replace three small integers with symbolic constants.
    TRANS_HDR_LEN = 23
    DATA_HDR_LEN = 42
    DATA_VERSION_HDR_LEN = 58
The constants make it easier to remember what kind of header is being
read and/or what kind of offset is being computed.

Refactor commitVersion():
    - Keep locking & arg checking in commitVersion(), but move actual
      commit logic to _commitVersion().  This removes a level of
      indentation.

    - Remove local vars that alias attributes of other vars

Add a few more POSKeyError exceptions.
parent 3e4762b3
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Inline Side-by-side
Showing with 186 additions and 178 deletions
src/ZODB/FileStorage.py
View file @ a8b6c61d
......@@ -114,7 +114,7 @@
# may have a back pointer to a version record or to a non-version
# record.
#
__version__='$Revision: 1.79 $'[11:-2]
__version__='$Revision: 1.80 $'[11:-2]
import struct, time, os, string, base64, sys
from struct import pack, unpack
......@@ -135,6 +135,10 @@ except: fsync=None
from types import StringType
z64='\0'*8
# constants to support various header sizes
TRANS_HDR_LEN = 23
DATA_HDR_LEN = 42
DATA_VERSION_HDR_LEN = 58
def warn(message, *data):
LOG('ZODB FS',WARNING, "%s warn: %s\n" % (packed_version, (message % data)))
......@@ -329,25 +333,26 @@ class FileStorage(BaseStorage.BaseStorage,
pos=pos-tl-8
if pos < 4: return 0
seek(pos)
tid, stl, status, ul, dl, el = unpack(">8s8scHHH", read(23))
s = read(TRANS_HDR_LEN)
tid, stl, status, ul, dl, el = unpack(">8s8scHHH", s)
if not ltid: ltid=tid
if stl != rstl: return 0 # inconsistent lengths
if status == 'u': continue # undone trans, search back
if status not in ' p': return 0
if tl < (23+ul+dl+el): return 0
if tl < (TRANS_HDR_LEN + ul + dl + el): return 0
tend=pos+tl
opos=pos+(23+ul+dl+el)
opos=pos+(TRANS_HDR_LEN + ul + dl + el)
if opos==tend: continue # empty trans
while opos < tend:
# Read the data records for this transaction
seek(opos)
h=read(42)
h=read(DATA_HDR_LEN)
oid,serial,sprev,stloc,vlen,splen = unpack(">8s8s8s8sH8s", h)
tloc=U64(stloc)
plen=U64(splen)
dlen=42+(plen or 8)
dlen=DATA_HDR_LEN+(plen or 8)
if vlen: dlen=dlen+(16+vlen)
if opos+dlen > tend or tloc != pos: return 0
......@@ -422,86 +427,85 @@ class FileStorage(BaseStorage.BaseStorage,
self._lock_acquire()
try:
read=self._file.read
seek=self._file.seek
tfile=self._tfile
write=tfile.write
tindex=self._tindex
index=self._index
index_get=index.get
return self._commitVersion(src, dest, transaction, abort)
finally:
self._lock_release()
srcpos=self._vindex_get(src, 0)
spos=p64(srcpos)
middle=struct.pack(">8sH8s", p64(self._pos), len(dest), z64)
def _commitVersion(self, src, dest, transaction, abort=None):
# call after checking arguments and acquiring lock
srcpos = self._vindex_get(src, 0)
spos = p64(srcpos)
# middle holds bytes 16:34 of a data record:
# pos of transaction, len of version name, data length
# commit version never writes data, so data length is always 0
middle = struct.pack(">8sH8s", p64(self._pos), len(dest), z64)
if dest:
sd = p64(self._vindex_get(dest, 0))
heredelta = 66 + len(dest)
else:
sd = ''
heredelta = 50
here = self._pos + (self._tfile.tell() + self._thl)
oids = []
current_oids = {}
t = None
tstatus = ' '
while srcpos:
self._file.seek(srcpos)
h = self._file.read(DATA_VERSION_HDR_LEN)
# h -> oid, serial, prev(oid), tloc, vlen, plen, pnv, pv
oid=h[:8]
pnv=h[-16:-8]
if self._index.get(oid) == srcpos:
# This is a current record!
self._tindex[oid] = here
oids.append(oid)
self._tfile.write(h[:16] + spos + middle)
if dest:
self._tvindex[dest] = here
self._tfile.write(pnv + sd + dest)
sd = p64(here)
self._tfile.write(abort and pnv or spos)
# data backpointer to src data
here += heredelta
current_oids[oid] = 1
if dest:
sd=p64(self._vindex_get(dest, 0))
heredelta=66+len(dest)
else:
sd=''
heredelta=50
here=self._pos+(tfile.tell()+self._thl)
oids=[]
appoids=oids.append
tvindex=self._tvindex
current_oids={}
current=current_oids.has_key
t=None
tstatus=' '
while srcpos:
seek(srcpos)
h=read(58) # oid, serial, prev(oid), tloc, vlen, plen, pnv, pv
oid=h[:8]
pnv=h[-16:-8]
if index_get(oid) == srcpos:
# This is a current record!
tindex[oid]=here
appoids(oid)
write(h[:16] + spos + middle)
if dest:
tvindex[dest]=here
write(pnv+sd+dest)
sd=p64(here)
write(abort and pnv or spos) # data backpointer to src data
here=here+heredelta
current_oids[oid]=1
else:
# Hm. This is a non-current record. Is there a
# current record for this oid?
if not current(oid):
# Nope. We're done *if* this transaction wasn't undone.
tloc=h[24:32]
if t != tloc:
# We haven't checked this transaction before,
# get it's status.
t=tloc
seek(U64(t)+16)
tstatus=read(1)
if tstatus != 'u':
# Yee ha! We can quit
break
spos=h[-8:]
srcpos=U64(spos)
return oids
finally: self._lock_release()
# Hm. This is a non-current record. Is there a
# current record for this oid?
if not current_oids.has_key(oid):
# Nope. We're done *if* this transaction wasn't undone.
tloc = h[24:32]
if t != tloc:
# We haven't checked this transaction before,
# get it's status.
t = tloc
self._file.seek(U64(t) + 16)
tstatus = self._file.read(1)
if tstatus != 'u':
# Yee ha! We can quit
break
spos = h[-8:]
srcpos = U64(spos)
return oids
def getSize(self): return self._pos
def _loada(self, oid, _index, file):
"Read any version and return the version"
pos=_index[oid]
try:
pos=_index[oid]
except KeyError:
raise POSKeyError(oid)
file.seek(pos)
read=file.read
h=read(42)
h=read(DATA_HDR_LEN)
doid,serial,prev,tloc,vlen,plen = unpack(">8s8s8s8sH8s", h)
if vlen:
nv = read(8) != z64
......@@ -540,10 +544,13 @@ class FileStorage(BaseStorage.BaseStorage,
def _load(self, oid, version, _index, file):
pos=_index[oid]
try:
pos=_index[oid]
except KeyError:
raise POSKeyError(oid)
file.seek(pos)
read=file.read
h=read(42)
h=read(DATA_HDR_LEN)
doid,serial,prev,tloc,vlen,plen = unpack(">8s8s8s8sH8s", h)
if doid != oid: raise CorruptedDataError, h
if vlen:
......@@ -580,7 +587,7 @@ class FileStorage(BaseStorage.BaseStorage,
raise POSKeyError(oid)
while 1:
seek(pos)
h=read(42)
h=read(DATA_HDR_LEN)
doid,dserial,prev,tloc,vlen,plen = unpack(">8s8s8s8sH8s", h)
if doid != oid: raise CorruptedDataError, h
if dserial == serial: break # Yeee ha!
......@@ -632,7 +639,7 @@ class FileStorage(BaseStorage.BaseStorage,
file=self._file
file.seek(old)
read=file.read
h=read(42)
h=read(DATA_HDR_LEN)
doid,oserial,sprev,stloc,vlen,splen = unpack(">8s8s8s8sH8s", h)
if doid != oid: raise CorruptedDataError, h
if vlen:
......@@ -773,7 +780,7 @@ class FileStorage(BaseStorage.BaseStorage,
self._tfile.seek(0)
def _begin(self, tid, u, d, e):
self._thl=23+len(u)+len(d)+len(e)
self._thl=TRANS_HDR_LEN+len(u)+len(d)+len(e)
self._nextpos=0
def tpc_vote(self, transaction):
......@@ -872,24 +879,24 @@ class FileStorage(BaseStorage.BaseStorage,
index_get=self._index_get
unpack=struct.unpack
seek(tpos)
h=read(23)
if len(h) != 23 or h[:8] != tid:
h=read(TRANS_HDR_LEN)
if len(h) != TRANS_HDR_LEN or h[:8] != tid:
raise UndoError('Invalid undo transaction id')
if h[16] == 'u': return
if h[16] != ' ': raise UndoError
tl=U64(h[8:16])
ul,dl,el=unpack(">HHH", h[17:23])
ul,dl,el=unpack(">HHH", h[17:TRANS_HDR_LEN])
tend=tpos+tl
pos=tpos+(23+ul+dl+el)
pos=tpos+(TRANS_HDR_LEN+ul+dl+el)
t={}
while pos < tend:
# Read the data records for this transaction
seek(pos)
h=read(42)
h=read(DATA_HDR_LEN)
oid,serial,sprev,stloc,vlen,splen = unpack(">8s8s8s8sH8s", h)
plen=U64(splen)
prev=U64(sprev)
dlen=42+(plen or 8)
dlen=DATA_HDR_LEN+(plen or 8)
if vlen: dlen=dlen+(16+vlen)
if index_get(oid, 0) != pos: raise UndoError
pos=pos+dlen
......@@ -918,7 +925,7 @@ class FileStorage(BaseStorage.BaseStorage,
read=file.read
file.seek(pos)
h=read(42)
h=read(DATA_HDR_LEN)
roid,serial,sprev,stloc,vlen,splen = unpack(">8s8s8s8sH8s", h)
if roid != oid: raise UndoError('Invalid undo transaction id')
if vlen:
......@@ -941,7 +948,7 @@ class FileStorage(BaseStorage.BaseStorage,
def _getVersion(self, oid, pos):
self._file.seek(pos)
read=self._file.read
h=read(42)
h=read(DATA_HDR_LEN)
doid,serial,sprev,stloc,vlen,splen = unpack(">8s8s8s8sH8s", h)
if vlen:
h=read(16)
......@@ -1021,11 +1028,13 @@ class FileStorage(BaseStorage.BaseStorage,
"""Undo a transaction, given by transaction_id.
Do so by writing new data that reverses the action taken by
the transaction."""
# Usually, we can get by with just copying a data pointer, by
# writing a file position rather than a pickle. Sometimes, we
# may do conflict resolution, in which case we actually copy
# new data that results from resolution.
the transaction.
Usually, we can get by with just copying a data pointer, by
writing a file position rather than a pickle. Sometimes, we
may do conflict resolution, in which case we actually copy
new data that results from resolution.
"""
if self._is_read_only:
raise POSException.ReadOnlyError()
......@@ -1034,69 +1043,68 @@ class FileStorage(BaseStorage.BaseStorage,
self._lock_acquire()
try:
transaction_id=base64.decodestring(transaction_id+'==\n')
transaction_id = base64.decodestring(transaction_id + '==\n')
tid, tpos = transaction_id[:8], U64(transaction_id[8:])
seek=self._file.seek
read=self._file.read
unpack=struct.unpack
write=self._tfile.write
ostloc = p64(self._pos)
newserial=self._serial
here=self._pos+(self._tfile.tell()+self._thl)
here = self._pos + (self._tfile.tell() + self._thl)
seek(tpos)
h=read(23)
if len(h) != 23 or h[:8] != tid:
self._file.seek(tpos)
h = self._file.read(TRANS_HDR_LEN)
if len(h) != TRANS_HDR_LEN or h[:8] != tid:
raise UndoError, 'Invalid undo transaction id'
if h[16] == 'u': return
if h[16] == 'u':
return
if h[16] != ' ':
raise UndoError, 'non-undoable transaction'
tl=U64(h[8:16])
ul,dl,el=unpack(">HHH", h[17:23])
tend=tpos+tl
pos=tpos+(23+ul+dl+el)
tindex={}
failures={} # keep track of failures, cause we may succeed later
failed=failures.has_key
tl = U64(h[8:16])
ul, dl, el = struct.unpack(">HHH", h[17:TRANS_HDR_LEN])
tend = tpos + tl
pos = tpos + (TRANS_HDR_LEN + ul + dl + el)
tindex = {}
failures = {} # keep track of failures, cause we may succeed later
failed = failures.has_key
# Read the data records for this transaction
while pos < tend:
seek(pos)
h=read(42)
oid,serial,sprev,stloc,vlen,splen = unpack(">8s8s8s8sH8s", h)
if failed(oid): del failures[oid] # second chance!
plen=U64(splen)
prev=U64(sprev)
self._file.seek(pos)
h = self._file.read(DATA_HDR_LEN)
oid, serial, sprev, stloc, vlen, splen = \
struct.unpack(">8s8s8s8sH8s", h)
if failed(oid):
del failures[oid] # second chance!
plen = U64(splen)
prev = U64(sprev)
if vlen:
dlen=58+vlen+(plen or 8)
read(16)
version=read(vlen)
dlen = DATA_VERSION_HDR_LEN + vlen + (plen or 8)
self._file.seek(16, 1)
version = self._file.read(vlen)
else:
dlen=42+(plen or 8)
version=''
dlen = DATA_HDR_LEN + (plen or 8)
version = ''
try:
p, prev, v, snv, ipos = self._transactionalUndoRecord(
oid, pos, serial, prev, version)
except UndoError, v:
# Don't fail right away. We may be redeemed later!
failures[oid]=v
failures[oid] = v
else:
plen=len(p)
write(pack(">8s8s8s8sH8s",
oid, newserial, p64(ipos), ostloc,
len(v), p64(plen)))
plen =len(p)
self._tfile.write(pack(">8s8s8s8sH8s",
oid, self._serial, p64(ipos),
ostloc, len(v), p64(plen)))
if v:
vprev=self._tvindex.get(v, 0) or self._vindex.get(v, 0)
write(snv+p64(vprev)+v)
self._tfile.write(snv + p64(vprev) + v)
self._tvindex[v]=here
odlen = 58+len(v)+(plen or 8)
odlen = DATA_VERSION_HDR_LEN + len(v)+(plen or 8)
else:
odlen = 42+(plen or 8)
odlen = DATA_HDR_LEN+(plen or 8)
if p: write(p)
else: write(p64(prev))
if p:
self._tfile.write(p)
else:
self._tfile.write(p64(prev))
tindex[oid]=here
here=here+odlen
......@@ -1133,7 +1141,7 @@ class FileStorage(BaseStorage.BaseStorage,
seek(pos-8)
pos=pos-U64(read(8))-8
seek(pos)
h=read(23)
h=read(TRANS_HDR_LEN)
tid, tl, status, ul, dl, el = unpack(">8s8scHHH", h)
if tid < packt: break
if status != ' ': continue
......@@ -1216,7 +1224,7 @@ class FileStorage(BaseStorage.BaseStorage,
while 1:
if len(r) >= size: return r
seek(pos)
h=read(42)
h=read(DATA_HDR_LEN)
doid,serial,prev,tloc,vlen,plen = unpack(">8s8s8s8sH8s", h)
prev=U64(prev)
......@@ -1235,7 +1243,7 @@ class FileStorage(BaseStorage.BaseStorage,
wantver=None
seek(U64(tloc))
h=read(23)
h=read(TRANS_HDR_LEN)
tid, stl, status, ul, dl, el = unpack(">8s8scHHH",h)
user_name=read(ul)
description=read(dl)
......@@ -1399,8 +1407,8 @@ class FileStorage(BaseStorage.BaseStorage,
# Read the transaction record
seek(pos)
h=read(23)
if len(h) < 23: break
h=read(TRANS_HDR_LEN)
if len(h) < TRANS_HDR_LEN: break
tid, stl, status, ul, dl, el = unpack(">8s8scHHH",h)
if status=='c':
# Oops. we found a checkpoint flag.
......@@ -1417,7 +1425,7 @@ class FileStorage(BaseStorage.BaseStorage,
# for now to squash a bug.
write(h)
tl=tl+8
write(read(tl-23))
write(read(tl-TRANS_HDR_LEN))
opos=opos+tl
# Undone transaction, skip it
......@@ -1434,7 +1442,7 @@ class FileStorage(BaseStorage.BaseStorage,
if len(h) != thl:
raise 'Pack Error', opos
write(h)
thl=23+thl
thl=TRANS_HDR_LEN+thl
pos=tpos+thl
opos=otpos+thl
......@@ -1442,11 +1450,11 @@ class FileStorage(BaseStorage.BaseStorage,
# Read the data records for this transaction
seek(pos)
h=read(42)
h=read(DATA_HDR_LEN)
oid,serial,sprev,stloc,vlen,splen = unpack(
">8s8s8s8sH8s", h)
plen=U64(splen)
dlen=42+(plen or 8)
dlen=DATA_HDR_LEN+(plen or 8)
if vlen:
dlen=dlen+(16+vlen)
......@@ -1477,7 +1485,7 @@ class FileStorage(BaseStorage.BaseStorage,
# But maybe it's the most current committed
# record.
seek(ppos)
ph=read(42)
ph=read(DATA_HDR_LEN)
pdoid,ps,pp,pt,pvlen,pplen = unpack(
">8s8s8s8sH8s", ph)
if not pvlen:
......@@ -1499,7 +1507,7 @@ class FileStorage(BaseStorage.BaseStorage,
# place, after wandering around to figure
# out is we were current. Seek back
# to pickle data:
seek(pos+42)
seek(pos+DATA_HDR_LEN)
nvindex[oid]=opos
......@@ -1712,8 +1720,8 @@ def shift_transactions_forward(index, vindex, tindex, file, pos, opos):
# Read the transaction record
seek(pos)
h=read(23)
if len(h) < 23: break
h=read(TRANS_HDR_LEN)
if len(h) < TRANS_HDR_LEN: break
tid, stl, status, ul, dl, el = unpack(">8s8scHHH",h)
if status=='c': break # Oops. we found a checkpoint flag.
tl=U64(stl)
......@@ -1731,17 +1739,17 @@ def shift_transactions_forward(index, vindex, tindex, file, pos, opos):
write(h)
write(h2)
thl=23+thl
thl=TRANS_HDR_LEN+thl
pos=tpos+thl
opos=otpos+thl
while pos < tend:
# Read the data records for this transaction
seek(pos)
h=read(42)
h=read(DATA_HDR_LEN)
oid,serial,sprev,stloc,vlen,splen = unpack(">8s8s8s8sH8s", h)
plen=U64(splen)
dlen=42+(plen or 8)
dlen=DATA_HDR_LEN+(plen or 8)
if vlen:
dlen=dlen+(16+vlen)
......@@ -1885,9 +1893,9 @@ def read_index(file, name, index, vindex, tindex, stop='\377'*8,
while 1:
# Read the transaction record
h=read(23)
h=read(TRANS_HDR_LEN)
if not h: break
if len(h) != 23:
if len(h) != TRANS_HDR_LEN:
if not read_only:
warn('%s truncated at %s', name, pos)
seek(pos)
......@@ -1916,7 +1924,7 @@ def read_index(file, name, index, vindex, tindex, stop='\377'*8,
if status not in ' up':
warn('%s has invalid status, %s, at %s', name, status, pos)
if tl < (23+ul+dl+el):
if tl < (TRANS_HDR_LEN+ul+dl+el):
# We're in trouble. Find out if this is bad data in the
# middle of the file, or just a turd that Win 9x dropped
# at the end when the system crashed.
......@@ -1926,7 +1934,7 @@ def read_index(file, name, index, vindex, tindex, stop='\377'*8,
rtl=U64(read(8))
# Now check to see if the redundant transaction length is
# reasonable:
if file_size - rtl < pos or rtl < 23:
if file_size - rtl < pos or rtl < TRANS_HDR_LEN:
nearPanic('%s has invalid transaction header at %s', name, pos)
if not read_only:
warn("It appears that there is invalid data at the end of "
......@@ -1955,18 +1963,18 @@ def read_index(file, name, index, vindex, tindex, stop='\377'*8,
pos=tend+8
continue
pos=tpos+(23+ul+dl+el)
pos=tpos+(TRANS_HDR_LEN+ul+dl+el)
while pos < tend:
# Read the data records for this transaction
seek(pos)
h=read(42)
h=read(DATA_HDR_LEN)
oid,serial,sprev,stloc,vlen,splen = unpack(">8s8s8s8sH8s", h)
prev=U64(sprev)
tloc=U64(stloc)
plen=U64(splen)
dlen=42+(plen or 8)
dlen=DATA_HDR_LEN+(plen or 8)
tindex[oid]=pos
if vlen:
......@@ -2017,20 +2025,22 @@ def read_index(file, name, index, vindex, tindex, stop='\377'*8,
def _loadBack(file, oid, back):
seek=file.seek
read=file.read
## seek=file.seek
## read=file.read
while 1:
old=U64(back)
old = U64(back)
if not old:
raise POSKeyError(oid)
seek(old)
h=read(42)
doid,serial,prev,tloc,vlen,plen = unpack(">8s8s8s8sH8s", h)
file.seek(old)
h=file.read(DATA_HDR_LEN)
doid, serial, prev, tloc, vlen, plen = unpack(">8s8s8s8sH8s", h)
if vlen: seek(vlen+16,1)
if plen != z64: return read(U64(plen)), serial
back=read(8) # We got a back pointer!
if vlen:
file.seek(vlen + 16, 1)
if plen != z64:
return file.read(U64(plen)), serial
back = file.read(8) # We got a back pointer!
def _loadBackPOS(file, oid, back):
"""Return the position of the record containing the data used by
......@@ -2043,7 +2053,7 @@ def _loadBackPOS(file, oid, back):
if not old:
raise POSKeyError(oid)
seek(old)
h=read(42)
h=read(DATA_HDR_LEN)
doid,serial,prev,tloc,vlen,plen = unpack(">8s8s8s8sH8s", h)
if vlen: seek(vlen+16,1)
if plen != z64: return old
......@@ -2093,8 +2103,7 @@ class Iterator:
class FileIterator(Iterator):
"""Iterate over the transactions in a FileStorage file.
"""
_ltid=z64
_ltid = z64
_file = None
def __init__(self, file, start=None, stop=None):
......@@ -2158,8 +2167,8 @@ class FileIterator(Iterator):
while 1:
# Read the transaction record
seek(pos)
h=read(23)
if len(h) < 23: break
h=read(TRANS_HDR_LEN)
if len(h) < TRANS_HDR_LEN: break
tid, stl, status, ul, dl, el = unpack(">8s8scHHH",h)
if el < 0: el=t32-el
......@@ -2182,7 +2191,7 @@ class FileIterator(Iterator):
warn('%s has invalid status, %s, at %s', self._file.name,
status, pos)
if tl < (23+ul+dl+el):
if tl < (TRANS_HDR_LEN+ul+dl+el):
# We're in trouble. Find out if this is bad data in
# the middle of the file, or just a turd that Win 9x
# dropped at the end when the system crashed. Skip to
......@@ -2192,7 +2201,7 @@ class FileIterator(Iterator):
rtl=U64(read(8))
# Now check to see if the redundant transaction length is
# reasonable:
if self._file_size - rtl < pos or rtl < 23:
if self._file_size - rtl < pos or rtl < TRANS_HDR_LEN:
nearPanic('%s has invalid transaction header at %s',
self._file.name, pos)
warn("It appears that there is invalid data at the end of "
......@@ -2225,7 +2234,7 @@ class FileIterator(Iterator):
pos=tend+8
continue
pos=tpos+(23+ul+dl+el)
pos=tpos+(TRANS_HDR_LEN+ul+dl+el)
user=read(ul)
description=read(dl)
if el:
......@@ -2273,15 +2282,14 @@ class RecordIterator(Iterator, BaseStorage.TransactionRecord):
tend, file, seek, read, tpos = self._stuff
while pos < tend:
# Read the data records for this transaction
seek(pos)
h=read(42)
h=read(DATA_HDR_LEN)
oid,serial,sprev,stloc,vlen,splen = unpack(">8s8s8s8sH8s", h)
prev=U64(sprev)
tloc=U64(stloc)
plen=U64(splen)
dlen=42+(plen or 8)
dlen=DATA_HDR_LEN+(plen or 8)
if vlen:
dlen=dlen+(16+vlen)
......@@ -2312,7 +2320,7 @@ class RecordIterator(Iterator, BaseStorage.TransactionRecord):
else:
p = _loadBack(file, oid, p)[0]
r=Record(oid, serial, version, p)
r = Record(oid, serial, version, p)
return r
......
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