61 lines
1.7 KiB
Python
61 lines
1.7 KiB
Python
from django.utils import timezone as tz
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from aircox.models import Station
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from .streamer import Streamer
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__all__ = ("Streamers",)
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class Streamers:
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"""Keep multiple streamers in memory, allow fetching informations."""
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streamers = None
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"""Stations by station id."""
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streamer_class = Streamer
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timeout = None
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"""Timedelta to next update."""
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next_date = None
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"""Next update datetime."""
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def __init__(self, timeout=None, streamer_class=streamer_class):
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self.timeout = timeout or tz.timedelta(seconds=2)
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def reset(self, stations=Station.objects.active()):
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# FIXME: cf. TODO in aircox.controllers about model updates
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stations = stations.all()
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self.streamers = {station.pk: self.streamer_class(station) for station in stations}
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def fetch(self):
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"""Call streamers fetch if timed-out."""
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if self.streamers is None:
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self.reset()
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now = tz.now()
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if self.next_date is not None and now < self.next_date:
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return
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for streamer in self.streamers.values():
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streamer.fetch()
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self.next_date = now + self.timeout
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def get(self, key, default=None):
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return self.streamers.get(key, default)
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def values(self):
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return self.streamers.values()
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def __len__(self):
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return self.streamers and len(self.streamers) or 0
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def __getitem__(self, key):
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return self.streamers[key]
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def __contains__(self, key):
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"""Key can be a Station or a Station id."""
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if isinstance(key, Station):
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return key.pk in self.streamers
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return key in self.streamers
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def __iter__(self):
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return self.streamers.values() if self.streamers else iter(tuple())
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