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