def unserialize_blocks(file):
blocks = []
while True:
digest = file.read(Digest.dataDigestSize())
if digest == "":
break
size = Format.read_int(file)
code = Format.read_int(file)
blocks.append((digest, size, code))
return blocks
def start_dump(self, sequence_id, index):
assert self.mode is None
self.mode = "DUMP"
self.sequence_id = sequence_id
self.index = index
self.header_file = self.storage.open_header_file(
self.sequence_id, self.index)
assert self.header_file.tell() == 0
self.body_file = self.storage.open_body_file(
self.sequence_id, self.index)
assert self.body_file.tell() == 0
self.piggyback_headers_num = 0
self.piggyback_headers_size = 0
self.max_num_piggyback_headers = compute_num_piggyback_headers(self.index)
logging.debug("Container %d can add %d piggyback headers" %
(self.index, self.max_num_piggyback_headers))
self.body_dumper = DataDumper(self.body_file)
self.header_dump_os = StringIO.StringIO()
self.header_dumper = DataDumper(self.header_dump_os)
if self.storage.get_encryption_key() != "":
self.encryption_active = True
self.body_dumper.start_encryption(
CODE_ENCRYPTION_ARC4,
os.urandom(Digest.dataDigestSize()),
self.storage.get_encryption_key())
self.header_dumper.start_encryption(
CODE_ENCRYPTION_ARC4,
os.urandom(Digest.dataDigestSize()),
self.storage.get_encryption_key())
else:
self.encryption_active = False
self.body_dumper.start_compression(CODE_COMPRESSION_BZ2)
self.compression_active = True
self.compressed_data = 0
def _load_header(self, header_file):
logging.debug("****************************** loading header")
magic = header_file.read(len(MAGIC))
if MAGIC != magic:
raise Exception("Manent: magic number not found")
version = Format.read_int(header_file)
if version != VERSION:
raise Exception("Container %d has unsupported version" % self.index)
index = Format.read_int(header_file)
if index != self.index:
raise Exception(
"Manent: wrong container file index. Expected %s, found %s"
% (str(self.index), str(index)))
header_table_size = Format.read_int(header_file)
header_table_digest = header_file.read(Digest.dataDigestSize())
header_table_str = header_file.read(header_table_size)
if Digest.dataDigest(header_table_str) != header_table_digest:
raise Exception("Manent: header of container file corrupted")
header_dump_len = Format.read_int(header_file)
header_dump_str = header_file.read(header_dump_len)
header_table_io = StringIO.StringIO(header_table_str)
header_blocks = unserialize_blocks(header_table_io)
class BlockTableListener:
def __init__(self):
self.body_table_str = None
def is_requested(self, digest, code):
return code == CODE_BLOCK_TABLE
def loaded(self, digest, code, data):
assert code == CODE_BLOCK_TABLE
self.body_table_str = data
listener = BlockTableListener()
header_dump_str_io = StringIO.StringIO(header_dump_str)
header_dump_loader = DataDumpLoader(header_dump_str_io, header_blocks,
password=self.storage.get_encryption_key())
header_dump_loader.load_blocks(listener)
body_table_io = StringIO.StringIO(listener.body_table_str)
blocks = unserialize_blocks(body_table_io)
return blocks
def is_filled_by(self, num_blocks, size_blocks):
"""Test if the given number of blocks with given size
will fill the container. Assume that the blocks are not compressible"""
return not self._can_add_bytes(num_blocks * (8 + Digest.dataDigestSize()) +
size_blocks)
def encode_piggyback_container_index(index):
index_str = str(index)
extra_chars = Digest.dataDigestSize() - len(index_str)
index_str = index_str + (" " * extra_chars)
return index_str
def test_data_dumper_stress(self):
# Test with really lots of randomly generated data
handler = MockHandler()
outfile = StringIO.StringIO()
dumper = Container.DataDumper(outfile)
encryption_active = None
compression_active = None
known_blocks = {}
for i in range(10000):
action = random.randint(0,2)
if compression_active is not None:
compression_active -= 1
if compression_active == 0:
dumper.stop_compression()
compression_active = None
else:
#print " Compression has %d rounds to go"%compression_active
pass
if encryption_active is not None:
encryption_active -= 1
if encryption_active == 0:
if compression_active is not None:
# If we need to stop encryption, compression must be stopped first
dumper.stop_compression()
#print " Stopping encryption"
dumper.stop_encryption()
encryption_active = None
else:
#print " Encryption has %d rounds to go"%encryption_active
pass
if action==0:
# Generate new data item
data_size = random.randint(0,1000)
data = os.urandom(data_size)
code = random.choice([
Container.CODE_DATA,
Container.CODE_DIR,
Container.CODE_DATA,
Container.CODE_DATA_PACKER,
Container.CODE_DATA,
Container.CODE_DIR_PACKER,
Container.CODE_DATA,
Container.CODE_INCREMENT_DESCRIPTOR])
digest = Digest.dataDigest(data)
if code == Container.CODE_DATA and known_blocks.has_key(digest):
# We can't expect the same data block to be added twice to a container
continue
known_blocks[digest] = 1
dumper.add_block(digest, code, data)
# test not requesting to reload every CODE_DATA item
if code != Container.CODE_DATA or random.randint(0, 100) > 90:
handler.add_expected(digest, code, data)
elif action==1:
#continue
# Try to start encryption
# We can start encryption only if it is not active already
if encryption_active != None:
continue
if compression_active != None:
continue
encryption_active = random.randint(1,100)
#print " Starting encryption for %d rounds"
seed = os.urandom(Digest.dataDigestSize())
dumper.start_encryption(Container.CODE_ENCRYPTION_ARC4, seed,
"kakamaika")
elif action==2:
# Try to start compression
if compression_active != None:
continue
compression_active = random.randint(1,100)
if encryption_active != None:
compression_active = min(compression_active, encryption_active)
algorithm = random.choice([Container.CODE_COMPRESSION_BZ2])
dumper.start_compression(algorithm)
if compression_active is not None:
dumper.stop_compression()
if encryption_active is not None:
dumper.stop_encryption()
infile = StringIO.StringIO(outfile.getvalue())
blocks = dumper.get_blocks()
#print "blocks:"
#for digest,size,code in blocks:
#print base64.b64encode(digest), size, code
undumper = Container.DataDumpLoader(infile, blocks,
password="******")
undumper.load_blocks(handler)
self.failUnless(handler.check())
