def _with_age(score, time):
freshness = 1
if score > -1:
age = timedelta2seconds(datetime.utcnow() - time)
freshness = max(1, math.log10(max(1, max_age - age)))
str_time = "%020d" % datetime2seconds(time)
str_score_freshness = "%029.10f" % (freshness * score)
return str_score_freshness + str_time
def _with_age(score, time, impact=0):
if score > -1:
age = timedelta2seconds(datetime.utcnow() - time)
# freshness = 1 .. 5.2 if max_age == 2 days
freshness = math.log10(max(10, max_age - age))
else:
freshness = 1
# atan normalizes to -pi/2 .. +pi/2
base = math.atan(freshness * score)
# add impact
assert -10 <= impact <= 10
result = base + impact * math.pi
str_time = "%020d" % datetime2seconds(time)
str_score_freshness = "%029.10f" % (result)
return str_score_freshness + str_time
