async def from_stream(cls, reader: ReaderAdapter,
fixed_header: MQTTFixedHeader):
# protocol name
protocol_name = await decode_string(reader)
# protocol level
protocol_level_byte = await read_or_raise(reader, 1)
protocol_level = bytes_to_int(protocol_level_byte)
# flags
flags_byte = await read_or_raise(reader, 1)
flags = bytes_to_int(flags_byte)
# keep-alive
keep_alive_byte = await read_or_raise(reader, 2)
keep_alive = bytes_to_int(keep_alive_byte)
return cls(flags, keep_alive, protocol_name, protocol_level)
async def from_stream(
cls,
reader: ReaderAdapter,
fixed_header: MQTTFixedHeader,
variable_header: MQTTVariableHeader,
):
return_codes = []
bytes_to_read = fixed_header.remaining_length - variable_header.bytes_length
for i in range(0, bytes_to_read):
try:
return_code_byte = await read_or_raise(reader, 1)
return_code = bytes_to_int(return_code_byte)
return_codes.append(return_code)
except NoDataException:
break
return cls(return_codes)
async def from_stream(
cls,
reader: asyncio.StreamReader,
fixed_header: MQTTFixedHeader,
variable_header: MQTTVariableHeader,
):
topics = []
payload_length = fixed_header.remaining_length - variable_header.bytes_length
read_bytes = 0
while read_bytes < payload_length:
try:
topic = await decode_string(reader)
qos_byte = await read_or_raise(reader, 1)
qos = bytes_to_int(qos_byte)
topics.append((topic, qos))
read_bytes += 2 + len(topic.encode("utf-8")) + 1
except NoDataException:
break
return cls(topics)
def test_bytes_to_int(self):
ret = bytes_to_int(b"\x7f")
self.assertEqual(ret, 127)
ret = bytes_to_int(b"\xff\xff")
self.assertEqual(ret, 65535)
async def from_stream(cls, reader: ReaderAdapter, fixed_header: MQTTFixedHeader):
data = await read_or_raise(reader, 2)
session_parent = data[0] & 0x01
return_code = bytes_to_int(data[1])
return cls(session_parent, return_code)
