mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-09-20 06:17:29 +02:00
232 lines
9.2 KiB
Python
232 lines
9.2 KiB
Python
# Copyright (c) 2014 Roger Light <roger@atchoo.org>
|
|
#
|
|
# 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:
|
|
# Roger Light - initial API and implementation
|
|
|
|
"""
|
|
This module provides some helper functions to allow straightforward publishing
|
|
of messages in a one-shot manner. In other words, they are useful for the
|
|
situation where you have a single/multiple messages you want to publish to a
|
|
broker, then disconnect and nothing else is required.
|
|
"""
|
|
from __future__ import absolute_import
|
|
|
|
import collections
|
|
try:
|
|
from collections.abc import Iterable
|
|
except ImportError:
|
|
from collections import Iterable
|
|
|
|
from . import client as paho
|
|
from .. import mqtt
|
|
|
|
def _do_publish(client):
|
|
"""Internal function"""
|
|
|
|
message = client._userdata.popleft()
|
|
|
|
if isinstance(message, dict):
|
|
client.publish(**message)
|
|
elif isinstance(message, (tuple, list)):
|
|
client.publish(*message)
|
|
else:
|
|
raise TypeError('message must be a dict, tuple, or list')
|
|
|
|
|
|
def _on_connect(client, userdata, flags, rc):
|
|
"""Internal callback"""
|
|
#pylint: disable=invalid-name, unused-argument
|
|
|
|
if rc == 0:
|
|
if len(userdata) > 0:
|
|
_do_publish(client)
|
|
else:
|
|
raise mqtt.MQTTException(paho.connack_string(rc))
|
|
|
|
|
|
def _on_publish(client, userdata, mid):
|
|
"""Internal callback"""
|
|
#pylint: disable=unused-argument
|
|
|
|
if len(userdata) == 0:
|
|
client.disconnect()
|
|
else:
|
|
_do_publish(client)
|
|
|
|
|
|
def multiple(msgs, hostname="localhost", port=1883, client_id="", keepalive=60,
|
|
will=None, auth=None, tls=None, protocol=paho.MQTTv311,
|
|
transport="tcp", proxy_args=None):
|
|
"""Publish multiple messages to a broker, then disconnect cleanly.
|
|
|
|
This function creates an MQTT client, connects to a broker and publishes a
|
|
list of messages. Once the messages have been delivered, it disconnects
|
|
cleanly from the broker.
|
|
|
|
msgs : a list of messages to publish. Each message is either a dict or a
|
|
tuple.
|
|
|
|
If a dict, only the topic must be present. Default values will be
|
|
used for any missing arguments. The dict must be of the form:
|
|
|
|
msg = {'topic':"<topic>", 'payload':"<payload>", 'qos':<qos>,
|
|
'retain':<retain>}
|
|
topic must be present and may not be empty.
|
|
If payload is "", None or not present then a zero length payload
|
|
will be published.
|
|
If qos is not present, the default of 0 is used.
|
|
If retain is not present, the default of False is used.
|
|
|
|
If a tuple, then it must be of the form:
|
|
("<topic>", "<payload>", qos, retain)
|
|
|
|
hostname : a string containing the address of the broker to connect to.
|
|
Defaults to localhost.
|
|
|
|
port : the port to connect to the broker on. Defaults to 1883.
|
|
|
|
client_id : the MQTT client id to use. If "" or None, the Paho library will
|
|
generate a client id automatically.
|
|
|
|
keepalive : the keepalive timeout value for the client. Defaults to 60
|
|
seconds.
|
|
|
|
will : a dict containing will parameters for the client: will = {'topic':
|
|
"<topic>", 'payload':"<payload">, 'qos':<qos>, 'retain':<retain>}.
|
|
Topic is required, all other parameters are optional and will
|
|
default to None, 0 and False respectively.
|
|
Defaults to None, which indicates no will should be used.
|
|
|
|
auth : a dict containing authentication parameters for the client:
|
|
auth = {'username':"<username>", 'password':"<password>"}
|
|
Username is required, password is optional and will default to None
|
|
if not provided.
|
|
Defaults to None, which indicates no authentication is to be used.
|
|
|
|
tls : a dict containing TLS configuration parameters for the client:
|
|
dict = {'ca_certs':"<ca_certs>", 'certfile':"<certfile>",
|
|
'keyfile':"<keyfile>", 'tls_version':"<tls_version>",
|
|
'ciphers':"<ciphers">, 'insecure':"<bool>"}
|
|
ca_certs is required, all other parameters are optional and will
|
|
default to None if not provided, which results in the client using
|
|
the default behaviour - see the paho.mqtt.client documentation.
|
|
Alternatively, tls input can be an SSLContext object, which will be
|
|
processed using the tls_set_context method.
|
|
Defaults to None, which indicates that TLS should not be used.
|
|
|
|
transport : set to "tcp" to use the default setting of transport which is
|
|
raw TCP. Set to "websockets" to use WebSockets as the transport.
|
|
proxy_args: a dictionary that will be given to the client.
|
|
"""
|
|
|
|
if not isinstance(msgs, Iterable):
|
|
raise TypeError('msgs must be an iterable')
|
|
|
|
client = paho.Client(client_id=client_id, userdata=collections.deque(msgs),
|
|
protocol=protocol, transport=transport)
|
|
|
|
client.on_publish = _on_publish
|
|
client.on_connect = _on_connect
|
|
|
|
if proxy_args is not None:
|
|
client.proxy_set(**proxy_args)
|
|
|
|
if auth:
|
|
username = auth.get('username')
|
|
if username:
|
|
password = auth.get('password')
|
|
client.username_pw_set(username, password)
|
|
else:
|
|
raise KeyError("The 'username' key was not found, this is "
|
|
"required for auth")
|
|
|
|
if will is not None:
|
|
client.will_set(**will)
|
|
|
|
if tls is not None:
|
|
if isinstance(tls, dict):
|
|
insecure = tls.pop('insecure', False)
|
|
client.tls_set(**tls)
|
|
if insecure:
|
|
# Must be set *after* the `client.tls_set()` call since it sets
|
|
# up the SSL context that `client.tls_insecure_set` alters.
|
|
client.tls_insecure_set(insecure)
|
|
else:
|
|
# Assume input is SSLContext object
|
|
client.tls_set_context(tls)
|
|
|
|
client.connect(hostname, port, keepalive)
|
|
client.loop_forever()
|
|
|
|
|
|
def single(topic, payload=None, qos=0, retain=False, hostname="localhost",
|
|
port=1883, client_id="", keepalive=60, will=None, auth=None,
|
|
tls=None, protocol=paho.MQTTv311, transport="tcp", proxy_args=None):
|
|
"""Publish a single message to a broker, then disconnect cleanly.
|
|
|
|
This function creates an MQTT client, connects to a broker and publishes a
|
|
single message. Once the message has been delivered, it disconnects cleanly
|
|
from the broker.
|
|
|
|
topic : the only required argument must be the topic string to which the
|
|
payload will be published.
|
|
|
|
payload : the payload to be published. If "" or None, a zero length payload
|
|
will be published.
|
|
|
|
qos : the qos to use when publishing, default to 0.
|
|
|
|
retain : set the message to be retained (True) or not (False).
|
|
|
|
hostname : a string containing the address of the broker to connect to.
|
|
Defaults to localhost.
|
|
|
|
port : the port to connect to the broker on. Defaults to 1883.
|
|
|
|
client_id : the MQTT client id to use. If "" or None, the Paho library will
|
|
generate a client id automatically.
|
|
|
|
keepalive : the keepalive timeout value for the client. Defaults to 60
|
|
seconds.
|
|
|
|
will : a dict containing will parameters for the client: will = {'topic':
|
|
"<topic>", 'payload':"<payload">, 'qos':<qos>, 'retain':<retain>}.
|
|
Topic is required, all other parameters are optional and will
|
|
default to None, 0 and False respectively.
|
|
Defaults to None, which indicates no will should be used.
|
|
|
|
auth : a dict containing authentication parameters for the client:
|
|
auth = {'username':"<username>", 'password':"<password>"}
|
|
Username is required, password is optional and will default to None
|
|
if not provided.
|
|
Defaults to None, which indicates no authentication is to be used.
|
|
|
|
tls : a dict containing TLS configuration parameters for the client:
|
|
dict = {'ca_certs':"<ca_certs>", 'certfile':"<certfile>",
|
|
'keyfile':"<keyfile>", 'tls_version':"<tls_version>",
|
|
'ciphers':"<ciphers">, 'insecure':"<bool>"}
|
|
ca_certs is required, all other parameters are optional and will
|
|
default to None if not provided, which results in the client using
|
|
the default behaviour - see the paho.mqtt.client documentation.
|
|
Defaults to None, which indicates that TLS should not be used.
|
|
Alternatively, tls input can be an SSLContext object, which will be
|
|
processed using the tls_set_context method.
|
|
|
|
transport : set to "tcp" to use the default setting of transport which is
|
|
raw TCP. Set to "websockets" to use WebSockets as the transport.
|
|
proxy_args: a dictionary that will be given to the client.
|
|
"""
|
|
|
|
msg = {'topic':topic, 'payload':payload, 'qos':qos, 'retain':retain}
|
|
|
|
multiple([msg], hostname, port, client_id, keepalive, will, auth, tls,
|
|
protocol, transport, proxy_args)
|