CC-2588 :Use RabbitMQ to control the show recorder
- done
This commit is contained in:
James
parent
047a288c38
commit
2b36e8193e
4 changed files with 150 additions and 210 deletions
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@ -8,9 +8,6 @@ import datetime
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import os
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import sys
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import shutil
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from Queue import Queue
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from commandlistener import CommandListener
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from configobj import ConfigObj
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@ -25,6 +22,10 @@ import mutagen
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from api_clients import api_client
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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, Consumer, Producer
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# configure logging
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try:
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logging.config.fileConfig("logging.cfg")
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@ -79,9 +80,12 @@ class ShowRecorder(Thread):
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#blocks at the following line until the child process
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#quits
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code = self.p.wait()
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self.logger.info("finishing record, return code %s", self.p.returncode)
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code = self.p.returncode
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self.p = None
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self.logger.info("finishing record, return code %s", code)
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return code, filepath
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def cancel_recording(self):
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@ -89,14 +93,13 @@ class ShowRecorder(Thread):
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#for this is because it appears that ecasound starts 1 second later than
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#it should, and therefore this method is sometimes incorrectly called 1
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#second before the show ends.
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time.sleep(3)
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#time.sleep(3)
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#send signal interrupt (2)
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self.logger.info("Show manually cancelled!")
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if (self.p is not None):
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self.p.terminate()
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self.p = None
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self.p.kill()
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#if self.p is defined, then the child process ecasound is recording
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def is_recording(self):
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return (self.p is not None)
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@ -146,86 +149,151 @@ class ShowRecorder(Thread):
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self.set_metadata_and_save(filepath)
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self.upload_file(filepath)
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os.remove(filepath)
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except Exceptio, e:
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self.logger.error(e)
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else:
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self.logger.info("problem recording show")
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class RecordScheduler(Thread):
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def __init__(self, q):
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os.remove(filepath)
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class CommandListener(Thread):
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def __init__(self):
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Thread.__init__(self)
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self.queue = q
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self.shows_to_record = {}
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self.api_client = api_client.api_client_factory(config)
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self.logger = logging.getLogger('root')
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self.sr = None
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self.current_schedule = {}
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self.shows_to_record = []
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self.time_till_next_show = 3600
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self.logger.info("RecorderFetch: init complete")
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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-show-recorder", "direct", durable=True, auto_delete=True)
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schedule_queue = Queue("recorder-fetch", exchange=schedule_exchange, key="foo")
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self.connection = BrokerConnection(config["rabbitmq_host"], config["rabbitmq_user"], config["rabbitmq_password"], "/")
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channel = self.connection.channel()
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consumer = Consumer(channel, schedule_queue)
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consumer.register_callback(self.handle_message)
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consumer.consume()
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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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def process_shows(self, shows):
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self.logger.info("Processing show schedules...")
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def handle_message(self, body, message):
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# ACK the message to take it off the queue
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message.ack()
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self.logger.info("Received command from RabbitMQ: " + message.body)
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m = json.loads(message.body)
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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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temp = m['shows']
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if temp is not None:
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self.parse_shows(temp)
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elif(command == 'cancel_recording'):
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if self.sr.is_recording():
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self.sr.cancel_recording()
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def parse_shows(self, shows):
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self.logger.info("Parsing show schedules...")
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self.shows_to_record = {}
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temp = shows[u'shows']
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for show in temp:
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for show in shows:
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show_starts = getDateTimeObj(show[u'starts'])
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show_end = getDateTimeObj(show[u'ends'])
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time_delta = show_end - show_starts
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self.shows_to_record[show[u'starts']] = [time_delta, show[u'instance_id'], show[u'name']]
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delta = self.get_time_till_next_show()
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# awake at least 5 seconds prior to the show start
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self.time_till_next_show = delta - 5
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self.logger.info(self.shows_to_record)
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def get_time_till_next_show(self):
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if len(self.shows_to_record) != 0:
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tnow = datetime.datetime.now()
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sorted_show_keys = sorted(self.shows_to_record.keys())
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start_time = sorted_show_keys[0]
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next_show = getDateTimeObj(start_time)
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delta = next_show - tnow
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out = delta.seconds
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self.logger.debug("Next show %s", next_show)
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self.logger.debug("Now %s", tnow)
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else:
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out = 3600
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return out
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def check_record(self):
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def start_record(self):
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if len(self.shows_to_record) != 0:
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try:
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tnow = datetime.datetime.now()
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sorted_show_keys = sorted(self.shows_to_record.keys())
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start_time = sorted_show_keys[0]
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next_show = getDateTimeObj(start_time)
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self.logger.debug("Next show %s", next_show)
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self.logger.debug("Now %s", tnow)
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delta = next_show - tnow
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min_delta = datetime.timedelta(seconds=5)
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if delta <= min_delta:
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self.logger.debug("sleeping %s seconds until show", delta.seconds)
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time.sleep(delta.seconds)
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show_length = self.shows_to_record[start_time][0]
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show_instance = self.shows_to_record[start_time][1]
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show_name = self.shows_to_record[start_time][2]
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self.sr = ShowRecorder(show_instance, show_name, show_length.seconds, start_time, filetype="mp3")
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self.sr.start()
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#remove show from shows to record.
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del self.shows_to_record[start_time]
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delta = self.get_time_till_next_show()
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self.logger.debug("sleeping %s seconds until show", delta)
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time.sleep(delta)
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sorted_show_keys = sorted(self.shows_to_record.keys())
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start_time = sorted_show_keys[0]
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show_length = self.shows_to_record[start_time][0]
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show_instance = self.shows_to_record[start_time][1]
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show_name = self.shows_to_record[start_time][2]
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self.sr = ShowRecorder(show_instance, show_name, show_length.seconds, start_time, filetype="mp3")
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self.sr.start()
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#remove show from shows to record.
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del self.shows_to_record[start_time]
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self.time_till_next_show = 3600
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except Exception,e :
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self.logger.error(e)
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else:
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self.logger.info("No recording schedule...")
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self.logger.debug("No recording scheduled...")
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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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self.logger.info("RecordScheduler started...")
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while True:
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if not self.queue.empty():
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try:
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self.logger.debug("Received data from command handler")
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shows = self.queue.get()
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self.logger.debug('shows %s' % shows)
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self.process_shows(shows)
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except Exception, e:
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self.logger.error(e)
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self.check_record()
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time.sleep(1)
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self.logger.info("Started...")
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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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# Bootstrap: since we are just starting up, we need to grab the
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# most recent schedule. After that we can just wait for updates.
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try:
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temp = self.api_client.get_shows_to_record()
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if temp is not None:
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shows = temp['shows']
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self.parse_shows(shows)
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self.logger.info("Bootstrap complete: got initial copy of the schedule")
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except Exception, e:
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self.logger.error(e)
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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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# block until 5 seconds before the next show start
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self.connection.drain_events(timeout=self.time_till_next_show)
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except Exception, e:
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self.logger.info(e)
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# start recording
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self.start_record()
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loops += 1
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if __name__ == '__main__':
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q = Queue()
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cl = CommandListener(q)
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cl = CommandListener()
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cl.start()
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rs = RecordScheduler(q)
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rs.start()
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