142 lines
5.1 KiB
Python
142 lines
5.1 KiB
Python
# -*- coding: utf-8 -*-
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import logging
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import sys
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from configobj import ConfigObj
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from threading import Thread
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import time
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# For RabbitMQ
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from kombu.connection import BrokerConnection
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from kombu.messaging import Exchange, Queue
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from kombu.simple import SimpleQueue
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import json
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from std_err_override import LogWriter
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# configure logging
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logging.config.fileConfig("logging.cfg")
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logger = logging.getLogger('message_h')
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LogWriter.override_std_err(logger)
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#need to wait for Python 2.7 for this..
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#logging.captureWarnings(True)
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# loading config file
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try:
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config = ConfigObj('/etc/airtime/pypo.cfg')
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LS_HOST = config['ls_host']
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LS_PORT = config['ls_port']
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POLL_INTERVAL = int(config['poll_interval'])
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except Exception, e:
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logger.error('Error loading config file: %s', e)
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sys.exit()
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class PypoMessageHandler(Thread):
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def __init__(self, pq, rq):
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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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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("airtime-pypo", "direct", durable=True, auto_delete=True)
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schedule_queue = Queue("pypo-fetch", exchange=schedule_exchange, key="foo")
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connection = BrokerConnection(config["rabbitmq_host"], config["rabbitmq_user"], config["rabbitmq_password"], config["rabbitmq_vhost"])
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channel = connection.channel()
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self.simple_queue = SimpleQueue(channel, schedule_queue)
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except Exception, e:
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self.logger.error(e)
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return False
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return True
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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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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 schdule...")
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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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except Exception, 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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while not self.init_rabbit_mq():
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self.logger.error("Error connecting to RabbitMQ Server. Trying again in few seconds")
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time.sleep(5)
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loops = 1
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while True:
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self.logger.info("Loop #%s", loops)
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try:
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message = self.simple_queue.get(block=True)
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self.handle_message(message.payload)
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# ACK the message to take it off the queue
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message.ack()
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except (IOError, AttributeError), e:
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import traceback
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top = traceback.format_exc()
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self.logger.error('Exception: %s', e)
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self.logger.error("traceback: %s", top)
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while not self.init_rabbit_mq():
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self.logger.error("Error connecting to RabbitMQ Server. Trying again in few seconds")
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time.sleep(5)
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except Exception, e:
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"""
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sleep 5 seconds so that we don't spin inside this
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while loop and eat all the CPU
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"""
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time.sleep(5)
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"""
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There is a problem with the RabbitMq messenger service. Let's
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log the error and get the schedule via HTTP polling
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"""
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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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loops += 1
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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 arent 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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