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CC-2084: Integrate RabbitMQ for immediate schedule updates and commands

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Implemented RabbitMQ on the pypo side.  Schedule updates are now
almost instantaneous and we are only polling the server once per
hour if we aren't updated in that time.  Canceling a show happens
right away.
This commit is contained in:
paul.baranowski 2011-03-23 01:09:27 -04:00
parent 7f7800aa2b
commit 78b33b9e23
5 changed files with 218 additions and 109 deletions
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17
pypo/pypopush.py
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@ -38,6 +38,7 @@ class PypoPush(Thread):
self.schedule = dict()
self.playlists = dict()
self.stream_metadata = dict()
"""
push_ahead2 MUST be < push_ahead. The difference in these two values
@ -53,18 +54,21 @@ class PypoPush(Thread):
self.schedule_tracker_file = self.cache_dir + "schedule_tracker.pickle"
"""
The Push Loop - the push loop periodically (minimal 1/2 of the playlist-grid)
checks if there is a playlist that should be scheduled at the current time.
If yes, the temporary liquidsoap playlist gets replaced with the corresponding one,
The Push Loop - the push loop periodically checks if there is a playlist
that should be scheduled at the current time.
If yes, the current liquidsoap playlist gets replaced with the corresponding one,
then liquidsoap is asked (via telnet) to reload and immediately play it.
"""
def push(self, export_source):
logger = logging.getLogger('push')
# get a new schedule from pypo-fetch
if not self.queue.empty():
scheduled_data = self.queue.get()
logger.debug("Received data from pypo-fetch")
self.schedule = scheduled_data['schedule']
self.playlists = scheduled_data['playlists']
self.stream_metadata = scheduled_data['stream_metadata']
schedule = self.schedule
playlists = self.playlists
@ -120,7 +124,8 @@ class PypoPush(Thread):
if start <= str_tnow_s and str_tnow_s < end:
currently_on_air = True
else:
logger.debug('Empty schedule')
pass
#logger.debug('Empty schedule')
if not currently_on_air:
tn = telnetlib.Telnet(LS_HOST, LS_PORT)
@ -184,7 +189,7 @@ class PypoPush(Thread):
def load_schedule_tracker(self):
logger = logging.getLogger('push')
logger.debug('load_schedule_tracker')
#logger.debug('load_schedule_tracker')
playedItems = dict()
# create the file if it doesnt exist
@ -197,7 +202,7 @@ class PypoPush(Thread):
except Exception, e:
logger.error('Error creating schedule tracker file: %s', e)
else:
logger.debug('schedule tracker file exists, opening: ' + self.schedule_tracker_file)
#logger.debug('schedule tracker file exists, opening: ' + self.schedule_tracker_file)
try:
schedule_tracker = open(self.schedule_tracker_file, "r")
playedItems = pickle.load(schedule_tracker)