erc20-demurrage-token/python/erc20_demurrage_token/demurrage.py
2021-07-02 15:29:56 +02:00

39 lines
1.5 KiB
Python

#
import logging
import datetime
import math
logging.basicConfig(level=logging.DEBUG)
logg = logging.getLogger()
class DemurrageCalculator:
def __init__(self, interest_f_minute):
self.r_min = interest_f_minute
self.r_hour = 1 - ((1 -self.r_min) ** 60)
self.r_day = 1 - ((1 -self.r_hour) ** 24)
#self.r_week = interest_f_day ** 7
logg.info('demurrage calculator set with min {:.32f} hour {:.32f} day {:.32f}'.format(self.r_min, self.r_hour, self.r_day))
def amount_since(self, amount, timestamp):
delta = datetime.datetime.utcnow() - datetime.datetime.fromtimestamp(timestamp)
adjusted_amount = amount * ((1 - self.r_day) ** (delta.days))
logg.debug('adjusted for {} days {} -> {}'.format(delta.days, amount, adjusted_amount))
remainder = delta.seconds
remainder_hours = math.floor(remainder / (60 * 60))
adjusted_delta = adjusted_amount * ((1 - self.r_hour) ** remainder_hours)
adjusted_amount -= (adjusted_amount - adjusted_delta)
logg.debug('adjusted for {} hours {} -> {} delta {}'.format(remainder_hours, amount, adjusted_amount, adjusted_delta))
remainder -= (remainder_hours * (60 * 60))
remainder_minutes = math.floor(remainder / 60)
adjusted_delta = adjusted_amount * ((1 - self.r_min) ** remainder_minutes)
adjusted_amount -= (adjusted_amount - adjusted_delta)
logg.debug('adjusted for {} hours {} -> {} delta {}'.format(remainder_minutes, amount, adjusted_amount, adjusted_delta))
return adjusted_amount