328 lines
11 KiB
Python
Executable File
328 lines
11 KiB
Python
Executable File
"""
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Handle the audio streamer and controls it as we want it to be. It is
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used to:
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- generate config files and playlists;
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- monitor Liquidsoap, logs and scheduled programs;
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- cancels Diffusions that have an archive but could not have been played;
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- run Liquidsoap
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"""
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# TODO:
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# x controllers: remaining
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# x diffusion conflicts
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# x cancel
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# x when liquidsoap fails to start/exists: exit
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# - handle restart after failure
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# - is stream restart after live ok?
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from argparse import RawTextHelpFormatter
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import time
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import pytz
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from django.db.models import Q
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from django.core.management.base import BaseCommand
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from django.utils import timezone as tz
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from aircox.models import Station, Episode, Diffusion, Track, Sound, Log
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from aircox.utils import date_range
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from aircox_streamer.controllers import Streamer
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# force using UTC
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tz.activate(pytz.UTC)
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class Monitor:
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"""
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Log and launch diffusions for the given station.
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Monitor should be able to be used after a crash a go back
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where it was playing, so we heavily use logs to be able to
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do that.
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We keep trace of played items on the generated stream:
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- sounds played on this stream;
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- scheduled diffusions
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- tracks for sounds of streamed programs
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"""
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streamer = None
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""" Streamer controller """
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delay = None
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""" Timedelta: minimal delay between two call of monitor. """
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logs = None
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""" Queryset to station's logs (ordered by -pk) """
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cancel_timeout = 20
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""" Timeout in minutes before cancelling a diffusion. """
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sync_timeout = 5
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""" Timeout in minutes between two streamer's sync. """
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sync_next = None
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""" Datetime of the next sync """
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@property
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def station(self):
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return self.streamer.station
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@property
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def last_log(self):
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""" Last log of monitored station. """
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return self.logs.first()
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@property
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def last_diff_start(self):
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""" Log of last triggered item (sound or diffusion). """
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return self.logs.start().with_diff().first()
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def __init__(self, streamer, delay, cancel_timeout, **kwargs):
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self.streamer = streamer
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# adding time ensure all calculation have a margin
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self.delay = delay + tz.timedelta(seconds=5)
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self.cancel_timeout = cancel_timeout
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self.__dict__.update(kwargs)
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self.logs = self.get_logs_queryset()
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def get_logs_queryset(self):
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""" Return queryset to assign as `self.logs` """
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return self.station.log_set.select_related('diffusion', 'sound') \
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.order_by('-pk')
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def monitor(self):
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""" Run all monitoring functions once. """
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if not self.streamer.is_ready:
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return
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self.streamer.fetch()
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# Skip tracing - analyzis:
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# Reason: multiple database request every x seconds, reducing it.
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# We could skip this part when remaining time is higher than a minimal
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# value (which should be derived from Command's delay). Problems:
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# - How to trace tracks? (+ Source can change: caching log might sucks)
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# - if liquidsoap's source/request changes: remaining time goes higher,
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# thus avoiding fetch
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#
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# Approach: something like having a mean time, such as:
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#
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# ```
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# source = stream.source
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# mean_time = source.air_time
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# + min(next_track.timestamp, source.remaining)
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# - (command.delay + 1)
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# trace_required = \/ source' != source
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# \/ source.uri' != source.uri
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# \/ now < mean_time
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# ```
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#
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source = self.streamer.source
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if source and source.uri:
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log = self.trace_sound(source)
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if log:
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self.trace_tracks(log)
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else:
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print('no source or sound for stream; source = ', source)
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self.handle_diffusions()
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self.sync()
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__last_log_kwargs = None
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def log(self, **kwargs):
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""" Create a log using **kwargs, and print info """
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if self.__last_log_kwargs == kwargs:
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return
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self.__last_log_kwargs = kwargs
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kwargs.setdefault('station', self.station)
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kwargs.setdefault('date', tz.now())
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log = Log(**kwargs)
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log.save()
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log.print()
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return log
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def trace_sound(self, source):
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""" Return on air sound log (create if not present). """
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air_uri, air_time = source.uri, source.air_time
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# check if there is yet a log for this sound on the source
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log = self.logs.on_air().filter(
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Q(sound__file=air_uri) |
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# sound can be null when arbitrary sound file is played
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Q(sound__isnull=True, track__isnull=True, comment=air_uri),
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source=source.id,
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date__range=date_range(air_time, self.delay),
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).first()
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if log:
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return log
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# get sound
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diff = None
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sound = Sound.objects.path(air_uri).first()
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if sound and sound.episode_id is not None:
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diff = Diffusion.objects.episode(id=sound.episode_id).on_air() \
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.now(air_time).first()
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# log sound on air
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return self.log(type=Log.TYPE_ON_AIR, date=source.air_time,
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source=source.id, sound=sound, diffusion=diff,
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comment=air_uri)
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def trace_tracks(self, log):
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"""
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Log tracks for the given sound log (for streamed programs only).
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"""
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if log.diffusion:
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return
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tracks = Track.objects \
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.filter(sound__id=log.sound_id, timestamp__isnull=False)\
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.order_by('timestamp')
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if not tracks.exists():
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return
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# exclude already logged tracks
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tracks = tracks.exclude(log__station=self.station, log__pk__gt=log.pk)
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now = tz.now()
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for track in tracks:
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pos = log.date + tz.timedelta(seconds=track.timestamp)
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if pos > now:
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break
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# log track on air
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self.log(type=Log.TYPE_ON_AIR, date=pos, source=log.source,
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track=track, comment=track)
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def handle_diffusions(self):
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"""
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Handle scheduled diffusion, trigger if needed, preload playlists
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and so on.
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"""
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# TODO: program restart
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# Diffusion conflicts are handled by the way a diffusion is defined
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# as candidate for the next dealer's start.
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#
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# ```
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# logged_diff: /\ \A diff in diffs: \E log: /\ log.type = START
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# /\ log.diff = diff
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# /\ log.date = diff.start
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# queue_empty: /\ dealer.queue is empty
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# /\ \/ ~dealer.on_air
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# \/ dealer.remaining < delay
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#
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# start_allowed: /\ diff not in logged_diff
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# /\ queue_empty
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#
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# start_canceled: /\ diff not in logged diff
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# /\ ~queue_empty
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# /\ diff.start < now + cancel_timeout
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# ```
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#
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now = tz.now()
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diff = Diffusion.objects.station(self.station).on_air().now(now) \
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.filter(episode__sound__type=Sound.TYPE_ARCHIVE) \
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.first()
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# Can't use delay: diffusion may start later than its assigned start.
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log = None if not diff else self.logs.start().filter(diffusion=diff)
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if not diff or log:
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return
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dealer = self.streamer.dealer
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# start
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if not dealer.queue and dealer.rid is None or \
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dealer.remaining < self.delay.total_seconds():
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self.start_diff(dealer, diff)
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# cancel
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if diff.start < now - self.cancel_timeout:
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self.cancel_diff(dealer, diff)
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def start_diff(self, source, diff):
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playlist = Sound.objects.episode(id=diff.episode_id).playlist()
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source.push(*playlist)
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self.log(type=Log.TYPE_START, source=source.id, diffusion=diff,
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comment=str(diff))
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def cancel_diff(self, source, diff):
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diff.type = Diffusion.TYPE_CANCEL
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diff.save()
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self.log(type=Log.TYPE_CANCEL, source=source.id, diffusion=diff,
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comment=str(diff))
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def sync(self):
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""" Update sources' playlists. """
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now = tz.now()
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if self.sync_next is not None and now < self.sync_next:
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return
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self.sync_next = now + tz.timedelta(minutes=self.sync_timeout)
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for source in self.streamer.playlists:
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source.sync()
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class Command (BaseCommand):
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help = __doc__
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def add_arguments(self, parser):
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parser.formatter_class = RawTextHelpFormatter
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group = parser.add_argument_group('actions')
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group.add_argument(
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'-c', '--config', action='store_true',
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help='generate configuration files for the stations'
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)
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group.add_argument(
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'-m', '--monitor', action='store_true',
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help='monitor the scheduled diffusions and log what happens'
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)
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group.add_argument(
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'-r', '--run', action='store_true',
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help='run the required applications for the stations'
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)
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group = parser.add_argument_group('options')
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group.add_argument(
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'-d', '--delay', type=int,
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default=1000,
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help='time to sleep in MILLISECONDS between two updates when we '
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'monitor. This influence the delay before a diffusion is '
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'launched.'
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)
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group.add_argument(
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'-s', '--station', type=str, action='append',
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help='name of the station to monitor instead of monitoring '
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'all stations'
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)
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group.add_argument(
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'-t', '--timeout', type=float,
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default=Monitor.cancel_timeout,
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help='time to wait in MINUTES before canceling a diffusion that '
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'should have ran but did not. '
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)
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# TODO: sync-timeout, cancel-timeout
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def handle(self, *args, config=None, run=None, monitor=None, station=[],
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delay=1000, timeout=600, **options):
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stations = Station.objects.filter(name__in=station) if station else \
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Station.objects.all()
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streamers = [Streamer(station) for station in stations]
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for streamer in streamers:
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if not streamer.outputs:
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raise RuntimeError("Streamer {} has no outputs".format(streamer.id))
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if config:
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streamer.make_config()
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if run:
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streamer.run_process()
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if monitor:
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delay = tz.timedelta(milliseconds=delay)
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timeout = tz.timedelta(minutes=timeout)
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monitors = [Monitor(streamer, delay, timeout)
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for streamer in streamers]
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while not run or streamer.is_running:
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for monitor in monitors:
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monitor.monitor()
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time.sleep(delay.total_seconds())
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if run:
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for streamer in streamers:
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streamer.wait_process()
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