144 lines
4.9 KiB
Python
144 lines
4.9 KiB
Python
#!/usr/bin/python
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"""
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Author: Vertigo Designs, Ryan Summers
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Robert Jördens
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Description: Provides an API for controlling Miniconf devices over MQTT.
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"""
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import argparse
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import asyncio
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import json
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import logging
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import sys
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import uuid
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from gmqtt import Client as MqttClient
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LOGGER = logging.getLogger(__name__)
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class Miniconf:
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"""An asynchronous API for controlling Miniconf devices using MQTT."""
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@classmethod
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async def create(cls, prefix, broker):
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"""Create a connection to the broker and a Miniconf device using it."""
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client = MqttClient(client_id='')
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await client.connect(broker)
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return cls(client, prefix)
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def __init__(self, client, prefix):
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"""Constructor.
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Args:
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client: A connected MQTT5 client.
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prefix: The MQTT toptic prefix of the device to control.
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"""
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self.request_id = 0
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self.client = client
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self.prefix = prefix
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self.inflight = {}
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self.client.on_message = self._handle_response
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self.response_topic = f'{prefix}/response/{uuid.uuid1().hex}'
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self.client.subscribe(self.response_topic)
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def _handle_response(self, _client, topic, payload, _qos, properties):
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"""Callback function for when messages are received over MQTT.
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Args:
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_client: The MQTT client.
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topic: The topic that the message was received on.
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payload: The payload of the message.
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_qos: The quality-of-service level of the received packet
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properties: A dictionary of properties associated with the message.
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"""
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if topic == self.response_topic:
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# Extract request_id corrleation data from the properties
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request_id = int.from_bytes(
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properties['correlation_data'][0], 'big')
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self.inflight[request_id].set_result(json.loads(payload))
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del self.inflight[request_id]
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else:
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LOGGER.warn('Unexpected message on "%s"', topic)
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async def command(self, path, value, retain=True):
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"""Write the provided data to the specified path.
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Args:
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path: The path to write the message to.
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value: The value to write to the path.
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retain: Retain the MQTT message changing the setting
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by the broker.
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Returns:
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The response to the command as a dictionary.
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"""
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topic = f'{self.prefix}/settings/{path}'
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fut = asyncio.get_running_loop().create_future()
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# Assign unique correlation data for response dispatch
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assert self.request_id not in self.inflight
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self.inflight[self.request_id] = fut
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correlation_data = self.request_id.to_bytes(4, 'big')
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self.request_id += 1
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payload = json.dumps(value)
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LOGGER.info('Sending "%s" to "%s"', value, topic)
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self.client.publish(
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topic, payload=payload, qos=0, retain=retain,
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response_topic=self.response_topic,
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correlation_data=correlation_data)
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return await fut
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def main():
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""" Main program entry point. """
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parser = argparse.ArgumentParser(
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description='Miniconf command line interface.',
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formatter_class=argparse.RawDescriptionHelpFormatter,
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epilog='''Examples:
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%(prog)s dt/sinara/dual-iir/00-11-22-33-aa-bb iir_ch/0/0=\
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'{"y_min":-32767,"y_max":32767,"y_offset":0,"ba":[1.0,0,0,0,0]}'
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%(prog)s dt/sinara/lockin/00-11-22-33-aa-bb afe/0='"G2"'\
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''')
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parser.add_argument('-v', '--verbose', action='count', default=0,
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help='Increase logging verbosity')
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parser.add_argument('--broker', '-b', default='mqtt', type=str,
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help='The MQTT broker address')
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parser.add_argument('--no-retain', '-n', default=False,
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action='store_true',
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help='Do not retain the affected settings')
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parser.add_argument('prefix', type=str,
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help='The MQTT topic prefix of the target')
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parser.add_argument('settings', metavar="PATH=VALUE", nargs='+',
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help='JSON encoded values for settings path keys.')
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args = parser.parse_args()
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logging.basicConfig(
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format='%(asctime)s [%(levelname)s] %(name)s: %(message)s',
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level=logging.WARN - 10*args.verbose)
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loop = asyncio.get_event_loop()
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async def configure_settings():
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interface = await Miniconf.create(args.prefix, args.broker)
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for setting in args.settings:
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path, value = setting.split("=", 1)
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response = await interface.command(path, json.loads(value),
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not args.no_retain)
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print(f'{path}: {response}')
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if response['code'] != 0:
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return response['code']
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return 0
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sys.exit(loop.run_until_complete(configure_settings()))
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if __name__ == '__main__':
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main()
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