def pop_cache_card_id(card_id, openid):
val = redis_client.get('%s_%s_card' % (card_id, openid))
if not val:
return None
tmp = JSONDecoder().decode(val)
if len(tmp) == 0:
return None
gid = tmp.pop()
val = JSONEncoder().encode(tmp)
redis_client.set('%s_%s_card' % (card_id, openid), val, 120)
return gid
