mirror of
git://holbrook.no/erc20-demurrage-token
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68 lines
2.7 KiB
Python
68 lines
2.7 KiB
Python
# standard imports
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import logging
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import datetime
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import math
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# eternal imports
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from chainlib.eth.constant import ZERO_ADDRESS
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# local imports
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from .token import DemurrageToken
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logg = logging.getLogger(__name__)
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class DemurrageCalculator:
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def __init__(self, interest_f_minute):
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self.r_min = interest_f_minute
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self.r_hour = 1 - ((1 -self.r_min) ** 60)
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self.r_day = 1 - ((1 -self.r_hour) ** 24)
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#self.r_week = interest_f_day ** 7
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logg.info('demurrage calculator set with min {:.32f} hour {:.32f} day {:.32f}'.format(self.r_min, self.r_hour, self.r_day))
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def amount_since(self, amount, timestamp):
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delta = datetime.datetime.utcnow() - datetime.datetime.fromtimestamp(timestamp)
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adjusted_amount = amount * ((1 - self.r_day) ** (delta.days))
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logg.debug('adjusted for {} days {} -> {}'.format(delta.days, amount, adjusted_amount))
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remainder = delta.seconds
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remainder_hours = math.floor(remainder / (60 * 60))
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adjusted_delta = adjusted_amount * ((1 - self.r_hour) ** remainder_hours)
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adjusted_amount -= (adjusted_amount - adjusted_delta)
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logg.debug('adjusted for {} hours {} -> {} delta {}'.format(remainder_hours, amount, adjusted_amount, adjusted_delta))
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remainder -= (remainder_hours * (60 * 60))
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remainder_minutes = math.floor(remainder / 60)
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adjusted_delta = adjusted_amount * ((1 - self.r_min) ** remainder_minutes)
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adjusted_amount -= (adjusted_amount - adjusted_delta)
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logg.debug('adjusted for {} minutes {} -> {} delta {}'.format(remainder_minutes, amount, adjusted_amount, adjusted_delta))
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return adjusted_amount
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def amount_since_slow(self, amount, timestamp):
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delta = datetime.datetime.utcnow() - datetime.datetime.fromtimestamp(timestamp)
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remainder_minutes = math.floor(delta.total_seconds() / 60)
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adjusted_amount = amount * ((1 - self.r_min) ** remainder_minutes)
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logg.debug('adjusted for {} minutes {} -> {} delta {}'.format(remainder_minutes, amount, adjusted_amount, amount - adjusted_amount))
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return adjusted_amount
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@staticmethod
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def from_contract(rpc, chain_spec, contract_address, sender_address=ZERO_ADDRESS):
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c = DemurrageToken(chain_spec)
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o = c.tax_level(contract_address, sender_address=sender_address)
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r = rpc.do(o)
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taxlevel_i = c.parse_tax_level(r)
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o = c.resolution_factor(contract_address, sender_address=sender_address)
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r = rpc.do(o)
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divider = c.parse_resolution_factor(r)
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logg.debug('taxlevel {} f {}'.format(taxlevel_i, divider))
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taxlevel_f = taxlevel_i / divider
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return DemurrageCalculator(taxlevel_f)
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