def open(cls, fd):
"""Open an existing timestamp log
fd must be positioned at the start of the log; the header will be
immediately read and DeserializationError raised if incorrect.
"""
ctx = StreamDeserializationContext(fd)
actual_magic = ctx.read_bytes(len(cls.HEADER_MAGIC))
if cls.HEADER_MAGIC != actual_magic:
raise BadMagicError(cls.HEADER_MAGIC, actual_magic)
file_hash_op = CryptOp.deserialize(ctx)
return cls(fd, file_hash_op)
def open(cls, fd):
"""Open an existing timestamp log
fd must be positioned at the start of the log; the header will be
immediately read and DeserializationError raised if incorrect.
"""
ctx = StreamDeserializationContext(fd)
actual_magic = ctx.read_bytes(len(cls.HEADER_MAGIC))
if cls.HEADER_MAGIC != actual_magic:
raise opentimestamps.core.serialize.BadMagicError(cls.HEADER_MAGIC, actual_magic)
file_hash_op = CryptOp.deserialize(ctx)
return cls(fd, file_hash_op)
def __iter__(self):
"""Iterate through all timestamps in the timestamp log"""
while True:
try:
reader = PacketReader(self.fd)
except PacketMissingError:
break
ctx = StreamDeserializationContext(reader)
try:
length = ctx.read_varuint()
file_hash = ctx.read_bytes(self.file_hash_op.DIGEST_LENGTH)
timestamp = Timestamp.deserialize(ctx, file_hash)
yield (length, timestamp)
except DeserializationError as exp:
# FIXME: should provide a way to get insight into these errors
pass
def __iter__(self):
"""Iterate through all timestamps in the timestamp log"""
while True:
try:
reader = PacketReader(self.fd)
except PacketMissingError:
break
ctx = StreamDeserializationContext(reader)
try:
length = ctx.read_varuint()
file_hash = ctx.read_bytes(self.file_hash_op.DIGEST_LENGTH)
timestamp = Timestamp.deserialize(ctx, file_hash)
yield (length, timestamp)
except DeserializationError as exp:
# FIXME: should provide a way to get insight into these errors
pass
