def get_live_promotions(srids, from_permacache=True):
if not from_permacache:
timer = g.stats.get_timer("promote.get_live.cass")
timer.start()
links = set()
weights = LiveAdWeights.get(srids)
for promos in weights.itervalues():
links.update(link_fn for link_fn, weight, campaign_fn in promos)
timer.stop()
else:
timer = g.stats.get_timer("promote.get_live.permacache")
timer.start()
links, weights = g.permacache.get(promotion_key()) or (set(), {})
timer.stop()
return links, weights
