133 lines
4.5 KiB
Python
133 lines
4.5 KiB
Python
import json
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import logging
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import os
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import sys
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import time
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import traceback
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from threading import Thread
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from amqp.exceptions import AMQPError
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# For RabbitMQ
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from kombu.connection import Connection
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from kombu.messaging import Exchange, Queue
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from kombu.mixins import ConsumerMixin
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from kombu.simple import SimpleQueue
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logging.captureWarnings(True)
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class RabbitConsumer(ConsumerMixin):
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def __init__(self, connection, queues, handler):
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self.connection = connection
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self.queues = queues
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self.handler = handler
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def get_consumers(self, Consumer, channel):
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return [
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Consumer(self.queues, callbacks=[self.on_message], accept=["text/plain"]),
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]
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def on_message(self, body, message):
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self.handler.handle_message(message.payload)
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message.ack()
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class PypoMessageHandler(Thread):
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def __init__(self, pq, rq, config):
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Thread.__init__(self)
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self.logger = logging.getLogger("message_h")
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self.pypo_queue = pq
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self.recorder_queue = rq
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self.config = config
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def init_rabbit_mq(self):
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self.logger.info("Initializing RabbitMQ stuff")
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try:
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schedule_exchange = Exchange(
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"airtime-pypo", "direct", durable=True, auto_delete=True
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)
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schedule_queue = Queue("pypo-fetch", exchange=schedule_exchange, key="foo")
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with Connection(
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self.config["host"],
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self.config["user"],
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self.config["password"],
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self.config["vhost"],
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heartbeat=5,
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) as connection:
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rabbit = RabbitConsumer(connection, [schedule_queue], self)
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rabbit.run()
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except Exception as e:
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self.logger.error(e)
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"""
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Handle a message from RabbitMQ, put it into our yucky global var.
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Hopefully there is a better way to do this.
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"""
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def handle_message(self, message):
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try:
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self.logger.info("Received event from RabbitMQ: %s" % message)
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try:
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message = message.decode()
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except (UnicodeDecodeError, AttributeError):
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pass
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m = json.loads(message)
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command = m["event_type"]
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self.logger.info("Handling command: " + command)
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if command == "update_schedule":
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self.logger.info("Updating schedule...")
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self.pypo_queue.put(message)
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elif command == "reset_liquidsoap_bootstrap":
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self.logger.info("Resetting bootstrap vars...")
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self.pypo_queue.put(message)
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elif command == "update_stream_setting":
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self.logger.info("Updating stream setting...")
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self.pypo_queue.put(message)
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elif command == "update_stream_format":
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self.logger.info("Updating stream format...")
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self.pypo_queue.put(message)
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elif command == "update_station_name":
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self.logger.info("Updating station name...")
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self.pypo_queue.put(message)
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elif command == "switch_source":
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self.logger.info("switch_source command received...")
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self.pypo_queue.put(message)
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elif command == "update_transition_fade":
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self.logger.info("Updating trasition fade...")
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self.pypo_queue.put(message)
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elif command == "disconnect_source":
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self.logger.info("disconnect_source command received...")
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self.pypo_queue.put(message)
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elif command == "update_recorder_schedule":
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self.recorder_queue.put(message)
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elif command == "cancel_recording":
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self.recorder_queue.put(message)
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else:
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self.logger.info("Unknown command: %s" % command)
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except Exception as e:
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self.logger.error("Exception in handling RabbitMQ message: %s", e)
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def main(self):
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try:
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self.init_rabbit_mq()
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except Exception as e:
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self.logger.error("Exception: %s", e)
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self.logger.error("traceback: %s", traceback.format_exc())
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self.logger.error(
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"Error connecting to RabbitMQ Server. Trying again in few seconds"
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)
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time.sleep(5)
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"""
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Main loop of the thread:
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Wait for schedule updates from RabbitMQ, but in case there aren't any,
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poll the server to get the upcoming schedule.
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"""
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def run(self):
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while True:
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self.main()
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