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miniconf: add some checks, simplify

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This commit is contained in:
Robert Jördens 2021-06-01 18:32:01 +02:00
parent 28aef35d87
commit af874c2eef
1 changed files with 31 additions and 28 deletions
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47
miniconf.py
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@ -34,30 +34,33 @@ class Miniconf:
client: A connected MQTT5 client.
prefix: The MQTT toptic prefix of the device to control.
"""
self.uuid = uuid.uuid1()
self.request_id = 0
self.client = client
self.prefix = prefix
self.inflight = {}
self.client.on_message = self._handle_response
self.client.subscribe(f'{prefix}/response/{self.uuid.hex}')
self.response_topic = f'{prefix}/response/{uuid.uuid1().hex}'
self.client.subscribe(self.response_topic)
def _handle_response(self, _client, _topic, payload, _qos, properties):
def _handle_response(self, _client, topic, payload, _qos, properties):
"""Callback function for when messages are received over MQTT.
Args:
_client: The MQTT client.
_topic: The topic that the message was received on.
topic: The topic that the message was received on.
payload: The payload of the message.
_qos: The quality-of-service level of the received packet
properties: A dictionary of properties associated with the message.
"""
if topic == self.response_topic:
# Extract request_id corrleation data from the properties
request_id = int.from_bytes(
properties['correlation_data'][0], 'big')
self.inflight[request_id].set_result(json.loads(payload))
del self.inflight[request_id]
else:
LOGGER.warn('Unexpected message on "%s"', topic)
async def command(self, path, value, retain=True):
"""Write the provided data to the specified path.
@ -71,24 +74,24 @@ class Miniconf:
Returns:
The response to the command as a dictionary.
"""
setting_topic = f'{self.prefix}/settings/{path}'
response_topic = f'{self.prefix}/response/{self.uuid.hex}'
topic = f'{self.prefix}/settings/{path}'
# Assign a unique identifier to this update request.
request_id = self.request_id
self.request_id += 1
assert request_id not in self.inflight, 'Invalid ID encountered'
correlation_data = request_id.to_bytes(4, 'big')
value = json.dumps(value)
LOGGER.info('Sending %s to "%s"', value, setting_topic)
fut = asyncio.get_running_loop().create_future()
self.inflight[request_id] = fut
self.client.publish(setting_topic, payload=value, qos=0, retain=retain,
response_topic=response_topic,
# Assign unique correlation data for response dispatch
assert self.request_id not in self.inflight
self.inflight[self.request_id] = fut
correlation_data = self.request_id.to_bytes(4, 'big')
self.request_id += 1
payload = json.dumps(value)
LOGGER.info('Sending "%s" to "%s"', value, topic)
self.client.publish(
topic, payload=payload, qos=0, retain=retain,
response_topic=self.response_topic,
correlation_data=correlation_data)
return await fut
@ -98,7 +101,7 @@ def main():
description='Miniconf command line interface.',
formatter_class=argparse.RawDescriptionHelpFormatter,
epilog='''Examples:
%(prog)s dt/sinara/stabilizer afe/0='"G2"' iir_ch/0/0=\
%(prog)s dt/sinara/stabilizer/00-11-22-33-aa-bb afe/0='"G2"' iir_ch/0/0=\
'{"y_min": -32767, "y_max": 32767, "y_offset": 0, "ba": [1.0, 0, 0, 0, 0]}'
''')
parser.add_argument('-v', '--verbose', action='count', default=0,
@ -110,7 +113,7 @@ def main():
help='Do not retain the affected settings')
parser.add_argument('prefix', type=str,
help='The MQTT topic prefix of the target')
parser.add_argument('settings', metavar="KEY=VALUE", nargs='+',
parser.add_argument('settings', metavar="PATH=VALUE", nargs='+',
help='JSON encoded values for settings path keys.')
args = parser.parse_args()
@ -123,8 +126,8 @@ def main():
async def configure_settings():
interface = await Miniconf.create(args.prefix, args.broker)
for key_value in args.settings:
path, value = key_value.split("=", 1)
for setting in args.settings:
path, value = setting.split("=", 1)
response = await interface.command(path, json.loads(value),
not args.no_retain)
print(f'{path}: {response}')