async def input_packet(self, packet):
packet = memoryview(packet)
typ, typ_len = parse_tl_num(packet)
siz, siz_len = parse_tl_num(packet, typ_len)
offset = typ_len + siz_len
assert len(packet) == offset + siz
await self.callback(typ, packet)
async def _receive(self, typ: int, data: BinaryStr):
"""
Pipeline when a packet is received.
:param typ: the Type.
:param data: the Value of the packet with TL.
"""
logging.debug('Packet received %s, %s' % (typ, bytes(data)))
if typ == LpTypeNumber.LP_PACKET:
try:
nack_reason, fragment = parse_lp_packet(data, with_tl=True)
except (DecodeError, TypeError, ValueError, struct.error):
logging.warning('Unable to decode received packet')
return
data = fragment
typ, _ = parse_tl_num(data)
else:
nack_reason = None
if nack_reason is not None:
try:
name, _, _, _ = parse_interest(data, with_tl=True)
except (DecodeError, TypeError, ValueError, struct.error):
logging.warning('Unable to decode the fragment of LpPacket')
return
logging.debug('NetworkNack received %s, reason=%s' %
(Name.to_str(name), nack_reason))
self._on_nack(name, nack_reason)
else:
if typ == TypeNumber.INTEREST:
try:
name, param, app_param, sig = parse_interest(data,
with_tl=True)
except (DecodeError, TypeError, ValueError, struct.error):
logging.warning('Unable to decode received packet')
return
logging.debug('Interest received %s' % Name.to_str(name))
await self._on_interest(name,
param,
app_param,
sig,
raw_packet=data)
elif typ == TypeNumber.DATA:
try:
name, meta_info, content, sig = parse_data(data,
with_tl=True)
except (DecodeError, TypeError, ValueError, struct.error):
logging.warning('Unable to decode received packet')
return
logging.debug('Data received %s' % Name.to_str(name))
await self._on_data(name,
meta_info,
content,
sig,
raw_packet=data)
else:
logging.warning('Unable to decode received packet')
def parse(buf):
# Verify the Type
typ, pos = parse_tl_num(buf)
if typ != StateVectorModelTypes.VECTOR.value:
return None
# Check the length
length, l = parse_tl_num(buf, pos)
pos += l
if pos + length != len(buf):
return None
# Decode components
ret = StateVectorModel()
ret.value = []
while pos < len(buf):
# Node ID
typ, l = parse_tl_num(buf, pos)
pos += l
if typ != StateVectorModelTypes.KEY.value:
return None
length, l = parse_tl_num(buf, pos)
pos += l
node_id = buf[pos:pos + length]
pos += length
# Value
typ, l = parse_tl_num(buf, pos)
pos += l
if typ != StateVectorModelTypes.VALUE.value:
return None
length, l = parse_tl_num(buf, pos)
pos += l
if length == 1:
value = struct.unpack_from('!B', buf, pos)[0]
elif length == 2:
value = struct.unpack_from('!H', buf, pos)[0]
elif length == 4:
value = struct.unpack_from('!I', buf, pos)[0]
elif length == 8:
value = struct.unpack_from('!Q', buf, pos)[0]
else:
return None
pos += length
# Append the component
comp = StateVectorComponentModel()
comp.node_id = node_id
comp.seq_num = value
ret.value.append(comp)
return ret
def parse(buf: Component) -> Optional[StateVectorModel]:
# Verify the Type
typ, pos = parse_tl_num(buf)
if typ != SVSyncTlvTypes.VECTOR.value:
return None
# Check the length
length, l = parse_tl_num(buf, pos)
pos += l
if pos + length != len(buf):
return None
# Decode components
ret: StateVectorModel = StateVectorModel([])
ret.value = []
while pos < len(buf):
# Entry ID
typ, l = parse_tl_num(buf, pos)
pos += l
if typ != SVSyncTlvTypes.VECTOR_ENTRY.value:
return None
length, l = parse_tl_num(buf, pos)
pos += l
entry = buf[pos:pos + length]
pos += length
# Seqno
typ, l = parse_tl_num(buf, pos)
pos += l
if typ != SVSyncTlvTypes.SEQNO.value:
return None
length, l = parse_tl_num(buf, pos)
pos += l
if length == 1:
seqno = unpack_from('!B', buf, pos)[0]
elif length == 2:
seqno = unpack_from('!H', buf, pos)[0]
elif length == 4:
seqno = unpack_from('!I', buf, pos)[0]
elif length == 8:
seqno = unpack_from('!Q', buf, pos)[0]
else:
return None
pos += length
# Append the component
ret.value.append(StateVectorEntry(bytes(entry).decode(), seqno))
return ret
def test_3():
assert parse_tl_num(b'\xfe\xfe\x00\x01\x00\x01', 1) == (65537, 5)
def test_2():
assert parse_tl_num(b'\x00\xfd\x00\xff\x00\x00\x00\x00\x00\x00',
1) == (255, 3)
def test_1():
assert parse_tl_num(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00') == (0,
1)
def test_4():
assert parse_tl_num(b'\xff\x00\x00\x00\x01*\x05\xf2\x00') == (
5000000000, 9)