def parse(cls, typedesc: bytes) -> TypeDesc:
buf = io.BytesIO(typedesc)
wrapped = binwrapper.BinWrapper(buf)
codecs_list = []
while buf.tell() < len(typedesc):
desc = cls._parse(wrapped, codecs_list)
if desc is not None:
codecs_list.append(desc)
return desc
def dump(self, outfn: os.PathLike) -> None:
with open(outfn, 'wb+') as outf:
buf = binwrapper.BinWrapper(outf)
buf.write_bytes(consts.HEADER_TITLE)
buf.write_ui64(consts.DUMP_FORMAT_VER)
self.conn._dump(on_header=functools.partial(
self._header_callback, buf),
on_data=functools.partial(self._block_callback,
buf))
def parse(cls, typedesc: bytes, protocol_version: tuple) -> TypeDesc:
buf = io.BytesIO(typedesc)
wrapped = binwrapper.BinWrapper(buf)
codecs_list = []
while buf.tell() < len(typedesc):
desc = cls._parse(wrapped, codecs_list, protocol_version)
if desc is not None:
codecs_list.append(desc)
if not codecs_list:
raise errors.InternalServerError('could not parse type descriptor')
return codecs_list[-1]
def dump(self) -> bytes:
iobuf = io.BytesIO()
buf = binwrapper.BinWrapper(iobuf)
fields = type(self)._fields
for fieldname, field in fields.items():
if fieldname in {'mtype', 'message_length'}:
continue
val = getattr(self, fieldname)
field.dump(val, buf)
dumped = iobuf.getvalue()
return (fields['mtype'].default.to_bytes(1, 'big') +
(len(dumped) + 4).to_bytes(4, 'big') + dumped)
def _parse(
self,
f: io.FileIO,
) -> Tuple[bytes, Iterator[bytes]]:
def block_reader(buf: binwrapper.BinWrapper) -> Iterable[bytes]:
while True:
try:
block_type = buf.read_bytes(1)
except BufferError:
# No more data blocks to read
return
if block_type != b'D':
raise RuntimeError('cannot read the data block')
block_hash = buf.read_bytes(20)
block_bytes = buf.read_len32_prefixed_bytes()
if hashlib.sha1(block_bytes).digest() != block_hash:
raise RuntimeError(
'dump integrity is compromised: data block '
'does not match the checksum')
yield block_bytes
buf = binwrapper.BinWrapper(f)
header = buf.read_bytes(consts.HEADER_TITLE_LEN)
if header != consts.HEADER_TITLE:
raise RuntimeError('not an EdgeDB dump')
dump_ver = buf.read_ui64()
if dump_ver > consts.MAX_SUPPORTED_DUMP_VER:
raise RuntimeError(f'dump version {dump_ver} is not supported')
block_type = buf.read_bytes(1)
if block_type != b'H':
raise RuntimeError('cannot find the header block')
header_hash = buf.read_bytes(20)
header_bytes = buf.read_len32_prefixed_bytes()
if hashlib.sha1(header_bytes).digest() != header_hash:
raise RuntimeError(
'dump integrity is compromised: header data does not match '
'the checksum')
return header_bytes, block_reader(buf)
def parse(cls, mtype: int, data: bytes) -> ServerMessage:
iobuf = io.BytesIO(data)
buffer = binwrapper.BinWrapper(iobuf)
kwargs: typing.Dict[str, any] = {}
msg_types = cls.index.get(mtype)
if not msg_types:
raise ValueError(f"unspecced message type {chr(mtype)!r}")
if len(msg_types) > 1:
raise ValueError(f"multiple specs for message type {chr(mtype)!r}")
msg_type = msg_types[0]
for fieldname, field in msg_type._fields.items():
if fieldname in {'mtype', 'message_length'}:
continue
kwargs[fieldname] = field.parse(buffer)
if len(iobuf.read(1)):
raise ValueError(
f'buffer is not empty after parsing {chr(mtype)!r} message')
return msg_type(**kwargs)
