def importFile(self, f, clue='', customImporters=None):
# This is tricky, because we need to work in a transaction!
if isinstance(f, six.string_types):
with open(f, 'rb') as fp:
return self.importFile(fp,
clue=clue,
customImporters=customImporters)
magic = f.read(4)
if magic != b'ZEXP':
if customImporters and magic in customImporters:
f.seek(0)
return customImporters[magic](self, f, clue)
raise ExportError("Invalid export header")
t = self.transaction_manager.get()
if clue:
t.note(clue)
return_oid_list = []
self._import = f, return_oid_list
self._register()
t.savepoint(optimistic=True)
# Return the root imported object.
if return_oid_list:
return self.get(return_oid_list[0])
else:
return None
def _importDuringCommit(self, transaction, f, return_oid_list):
"""Import data during two-phase commit.
Invoked by the transaction manager mid commit.
Appends one item, the OID of the first object created,
to return_oid_list.
"""
oids = {}
# IMPORTANT: This code should be consistent with the code in
# serialize.py. It is currently out of date and doesn't handle
# weak references.
def persistent_load(ooid):
"""Remap a persistent id to a new ID and create a ghost for it."""
klass = None
if isinstance(ooid, tuple):
ooid, klass = ooid
if not isinstance(ooid, bytes):
assert isinstance(ooid, str)
# this happens on Python 3 when all bytes in the oid are < 0x80
ooid = ooid.encode('ascii')
if ooid in oids:
oid = oids[ooid]
else:
if klass is None:
oid = self._storage.new_oid()
else:
oid = self._storage.new_oid(), klass
oids[ooid] = oid
return Ghost(oid)
while 1:
header = f.read(16)
if header == export_end_marker:
break
if len(header) != 16:
raise ExportError("Truncated export file")
# Extract header information
ooid = header[:8]
length = u64(header[8:16])
data = f.read(length)
if len(data) != length:
raise ExportError("Truncated export file")
if oids:
oid = oids[ooid]
if isinstance(oid, tuple):
oid = oid[0]
else:
oids[ooid] = oid = self._storage.new_oid()
return_oid_list.append(oid)
# Blob support
blob_begin = f.read(len(blob_begin_marker))
if blob_begin == blob_begin_marker:
# Copy the blob data to a temporary file
# and remember the name
blob_len = u64(f.read(8))
blob_filename = mktemp()
blob_file = open(blob_filename, "wb")
cp(f, blob_file, blob_len)
blob_file.close()
else:
f.seek(-len(blob_begin_marker), 1)
blob_filename = None
pfile = BytesIO(data)
unpickler = Unpickler(pfile)
unpickler.persistent_load = persistent_load
newp = BytesIO()
pickler = PersistentPickler(persistent_id, newp, _protocol)
pickler.dump(unpickler.load())
pickler.dump(unpickler.load())
data = newp.getvalue()
if blob_filename is not None:
self._storage.storeBlob(oid, None, data, blob_filename, '',
transaction)
else:
self._storage.store(oid, None, data, '', transaction)
def _importDuringCommit(self, transaction, f, return_oid_list):
"""Import data during two-phase commit.
Invoked by the transaction manager mid commit.
Appends one item, the OID of the first object created,
to return_oid_list.
"""
oids = {}
# IMPORTANT: This code should be consistent with the code in
# serialize.py. It is currently out of date and doesn't handle
# weak references.
def persistent_load(ooid):
"""Remap a persistent id to a new ID and create a ghost for it."""
klass = None
if isinstance(ooid, tuple):
ooid, klass = ooid
if ooid in oids:
oid = oids[ooid]
else:
if klass is None:
oid = self._storage.new_oid()
else:
oid = self._storage.new_oid(), klass
oids[ooid] = oid
return Ghost(oid)
version = self._version
while 1:
h = f.read(16)
if h == export_end_marker:
break
if len(h) != 16:
raise ExportError("Truncated export file")
l = u64(h[8:16])
p = f.read(l)
if len(p) != l:
raise ExportError("Truncated export file")
ooid = h[:8]
if oids:
oid = oids[ooid]
if isinstance(oid, tuple):
oid = oid[0]
else:
oids[ooid] = oid = self._storage.new_oid()
return_oid_list.append(oid)
pfile = StringIO(p)
unpickler = Unpickler(pfile)
unpickler.persistent_load = persistent_load
newp = StringIO()
pickler = Pickler(newp, 1)
pickler.persistent_id = persistent_id
pickler.dump(unpickler.load())
pickler.dump(unpickler.load())
p = newp.getvalue()
self._storage.store(oid, None, p, version, transaction)