kopia lustrzana https://github.com/Yakifo/amqtt
63 wiersze
2.3 KiB
Python
63 wiersze
2.3 KiB
Python
# Copyright (c) 2015 Nicolas JOUANIN
|
|
#
|
|
# See the file license.txt for copying permission.
|
|
from hbmqtt.mqtt.packet import MQTTPacket, MQTTFixedHeader, SUBSCRIBE, PacketIdVariableHeader, MQTTPayload, MQTTVariableHeader
|
|
from hbmqtt.errors import HBMQTTException, MQTTException
|
|
from hbmqtt.codecs import *
|
|
|
|
|
|
class SubscribePayload(MQTTPayload):
|
|
def __init__(self, topics=[]):
|
|
super().__init__()
|
|
self.topics = topics
|
|
|
|
def to_bytes(self, fixed_header: MQTTFixedHeader, variable_header: MQTTVariableHeader):
|
|
out = b''
|
|
for topic in self.topics:
|
|
out += encode_string(topic[0])
|
|
out += int_to_bytes(topic[1], 1)
|
|
return out
|
|
|
|
@classmethod
|
|
@asyncio.coroutine
|
|
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 = yield from decode_string(reader)
|
|
qos_byte = yield from 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 as exc:
|
|
break
|
|
return cls(topics)
|
|
|
|
def __repr__(self):
|
|
return type(self).__name__ + '(topics={0!r})'.format(self.topics)
|
|
|
|
|
|
class SubscribePacket(MQTTPacket):
|
|
VARIABLE_HEADER = PacketIdVariableHeader
|
|
PAYLOAD = SubscribePayload
|
|
|
|
def __init__(self, fixed: MQTTFixedHeader=None, variable_header: PacketIdVariableHeader=None, payload=None):
|
|
if fixed is None:
|
|
header = MQTTFixedHeader(SUBSCRIBE, 0x02) # [MQTT-3.8.1-1]
|
|
else:
|
|
if fixed.packet_type is not SUBSCRIBE:
|
|
raise HBMQTTException("Invalid fixed packet type %s for SubscribePacket init" % fixed.packet_type)
|
|
header = fixed
|
|
|
|
super().__init__(header)
|
|
self.variable_header = variable_header
|
|
self.payload = payload
|
|
|
|
@classmethod
|
|
def build(cls, topics, packet_id):
|
|
v_header = PacketIdVariableHeader(packet_id)
|
|
payload = SubscribePayload(topics)
|
|
return SubscribePacket(variable_header=v_header, payload=payload) |