mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-12-23 14:04:58 +01:00
110 lines
4.5 KiB
Python
110 lines
4.5 KiB
Python
"""
|
|
*******************************************************************
|
|
Copyright (c) 2017, 2019 IBM Corp.
|
|
|
|
All rights reserved. This program and the accompanying materials
|
|
are made available under the terms of the Eclipse Public License v1.0
|
|
and Eclipse Distribution License v1.0 which accompany this distribution.
|
|
|
|
The Eclipse Public License is available at
|
|
http://www.eclipse.org/legal/epl-v10.html
|
|
and the Eclipse Distribution License is available at
|
|
http://www.eclipse.org/org/documents/edl-v10.php.
|
|
|
|
Contributors:
|
|
Ian Craggs - initial implementation and/or documentation
|
|
*******************************************************************
|
|
"""
|
|
|
|
import sys
|
|
|
|
|
|
class MQTTException(Exception):
|
|
pass
|
|
|
|
|
|
class SubscribeOptions(object):
|
|
"""The MQTT v5.0 subscribe options class.
|
|
|
|
The options are:
|
|
qos: As in MQTT v3.1.1.
|
|
noLocal: True or False. If set to True, the subscriber will not receive its own publications.
|
|
retainAsPublished: True or False. If set to True, the retain flag on received publications will be as set
|
|
by the publisher.
|
|
retainHandling: RETAIN_SEND_ON_SUBSCRIBE, RETAIN_SEND_IF_NEW_SUB or RETAIN_DO_NOT_SEND
|
|
Controls when the broker should send retained messages:
|
|
- RETAIN_SEND_ON_SUBSCRIBE: on any successful subscribe request
|
|
- RETAIN_SEND_IF_NEW_SUB: only if the subscribe request is new
|
|
- RETAIN_DO_NOT_SEND: never send retained messages
|
|
"""
|
|
|
|
# retain handling options
|
|
RETAIN_SEND_ON_SUBSCRIBE, RETAIN_SEND_IF_NEW_SUB, RETAIN_DO_NOT_SEND = range(
|
|
0, 3)
|
|
|
|
def __init__(self, qos=0, noLocal=False, retainAsPublished=False, retainHandling=RETAIN_SEND_ON_SUBSCRIBE):
|
|
"""
|
|
qos: 0, 1 or 2. 0 is the default.
|
|
noLocal: True or False. False is the default and corresponds to MQTT v3.1.1 behavior.
|
|
retainAsPublished: True or False. False is the default and corresponds to MQTT v3.1.1 behavior.
|
|
retainHandling: RETAIN_SEND_ON_SUBSCRIBE, RETAIN_SEND_IF_NEW_SUB or RETAIN_DO_NOT_SEND
|
|
RETAIN_SEND_ON_SUBSCRIBE is the default and corresponds to MQTT v3.1.1 behavior.
|
|
"""
|
|
object.__setattr__(self, "names",
|
|
["QoS", "noLocal", "retainAsPublished", "retainHandling"])
|
|
self.QoS = qos # bits 0,1
|
|
self.noLocal = noLocal # bit 2
|
|
self.retainAsPublished = retainAsPublished # bit 3
|
|
self.retainHandling = retainHandling # bits 4 and 5: 0, 1 or 2
|
|
assert self.QoS in [0, 1, 2]
|
|
assert self.retainHandling in [
|
|
0, 1, 2], "Retain handling should be 0, 1 or 2"
|
|
|
|
def __setattr__(self, name, value):
|
|
if name not in self.names:
|
|
raise MQTTException(
|
|
name + " Attribute name must be one of "+str(self.names))
|
|
object.__setattr__(self, name, value)
|
|
|
|
def pack(self):
|
|
assert self.QoS in [0, 1, 2]
|
|
assert self.retainHandling in [
|
|
0, 1, 2], "Retain handling should be 0, 1 or 2"
|
|
noLocal = 1 if self.noLocal else 0
|
|
retainAsPublished = 1 if self.retainAsPublished else 0
|
|
data = [(self.retainHandling << 4) | (retainAsPublished << 3) |
|
|
(noLocal << 2) | self.QoS]
|
|
if sys.version_info[0] >= 3:
|
|
buffer = bytes(data)
|
|
else:
|
|
buffer = bytearray(data)
|
|
return buffer
|
|
|
|
def unpack(self, buffer):
|
|
b0 = buffer[0]
|
|
self.retainHandling = ((b0 >> 4) & 0x03)
|
|
self.retainAsPublished = True if ((b0 >> 3) & 0x01) == 1 else False
|
|
self.noLocal = True if ((b0 >> 2) & 0x01) == 1 else False
|
|
self.QoS = (b0 & 0x03)
|
|
assert self.retainHandling in [
|
|
0, 1, 2], "Retain handling should be 0, 1 or 2, not %d" % self.retainHandling
|
|
assert self.QoS in [
|
|
0, 1, 2], "QoS should be 0, 1 or 2, not %d" % self.QoS
|
|
return 1
|
|
|
|
def __repr__(self):
|
|
return str(self)
|
|
|
|
def __str__(self):
|
|
return "{QoS="+str(self.QoS)+", noLocal="+str(self.noLocal) +\
|
|
", retainAsPublished="+str(self.retainAsPublished) +\
|
|
", retainHandling="+str(self.retainHandling)+"}"
|
|
|
|
def json(self):
|
|
data = {
|
|
"QoS": self.QoS,
|
|
"noLocal": self.noLocal,
|
|
"retainAsPublished": self.retainAsPublished,
|
|
"retainHandling": self.retainHandling,
|
|
}
|
|
return data
|