guard-service/src/app.py

#!/usr/bin/env python3
import json
import logging

import sentry_sdk
import pika
import requests
from sentry_sdk.integrations.logging import LoggingIntegration

import config
import uuid
from mqtt_helper import MQTT

"""
Main entry point
"""

__author__ = "@tormakris"
__copyright__ = "Copyright 2020, Birbnetes Team"
__module_name__ = "app"
__version__text__ = "1"

if config.SENTRY_DSN:
    sentry_logging = LoggingIntegration(
        level=logging.DEBUG,  # Capture info and above as breadcrumbs
        event_level=logging.ERROR  # Send errors as events
    )
    sentry_sdk.init(
        dsn=config.SENTRY_DSN,
        send_default_pii=True,
        integrations=[sentry_logging],
        release=config.RELEASE_ID,
        environment=config.RELEASEMODE
    )


def setup_rabbit() -> None:
    logging.info("Connecting to RabbitMQ")
    credentials = pika.PlainCredentials(config.RABBIT_USERNAME, config.RABBIT_PASSWORD)
    connection = pika.BlockingConnection(pika.ConnectionParameters(host=config.RABBIT_HOSTNAME,
                                                                   credentials=credentials,
                                                                   heartbeat=0,
                                                                   socket_timeout=5))
    channel = connection.channel()
    channel.exchange_declare(exchange=config.RABBIT_EXCHANGE,
                             exchange_type='fanout',
                             durable=True,
                             auto_delete=False)
    queue = channel.queue_declare(durable=True, auto_delete=True, queue=uuid.uuid4().urn.split(':')[2],
                                  exclusive=True).method.queue
    channel.queue_bind(exchange=config.RABBIT_EXCHANGE, queue=queue)
    channel.basic_consume(queue=queue, on_message_callback=on_message, auto_ack=True)
    logging.debug("Starting consumption")
    channel.start_consuming()


def on_message(channel, method_frame, header_frame, body):
    msg_json = json.loads(body)
    if 'probability' not in msg_json:
        logging.error("Malformed message from broker")
    if msg_json['probability'] > 0.5:
        r = requests.get(f"http://{config.INPUT_HOSTNAME}/sample/{msg_json['tag']}")
        r.raise_for_status()
        if 'device_id' not in r.json():
            logging.error("Input-service response invalid")
        logging.info(f"Sending alert command to device {r.json()['device_id']}")
        mqtt.publish(subtopic=r.json()['device_id'],
                     message=json.dumps({"command": "doAlert"}))


if __name__ == "__main__":
    logging.info("Guard service starting")
    mqtt = MQTT()
    mqtt.topic = config.MQTT_TOPIC
    mqtt.connect()
    setup_rabbit()