cicnet/erc20-demurrage-token
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WIP avoid fractional truncation

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This commit is contained in:
nolash 2021-06-07 15:32:50 +02:00
parent dd878aa5cd
commit 5f69a1d7a1
Signed by: lash
GPG Key ID: 21D2E7BB88C2A746
6 changed files with 74 additions and 36 deletions
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2
python/erc20_demurrage_token/data/DemurrageTokenSingleCap.bin
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2
python/erc20_demurrage_token/data/DemurrageTokenSingleCap.json
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77
python/erc20_demurrage_token/sim/sim.py
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@ -65,7 +65,17 @@ class DemurrageTokenSimulation:
r = self.rpc.do(o)
if r['status'] != 1:
raise RuntimeError('failed gas transfer to account #{}: {} from {}'.format(i, address, self.accounts[idx]))
logg.debug('added actor account #{}: {}'.format(i, address))
logg.info('added actor account #{}: {} block {}'.format(i, address, r['block_number']))
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.constructor(self.accounts[0], settings, redistribute=redistribute, cap=cap)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
if (r['status'] != 1):
raise RuntimeError('contract deployment failed')
self.address = r['contract_address']
logg.info('deployed contract to {} block {}'.format(self.address, r['block_number']))
o = block_latest()
r = self.rpc.do(o)
@ -76,25 +86,14 @@ class DemurrageTokenSimulation:
r = self.rpc.do(o)
self.last_timestamp = r['timestamp']
self.start_timestamp = self.last_timestamp
nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.constructor(self.accounts[0], settings, redistribute=redistribute, cap=cap)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
if (r['status'] != 1):
raise RuntimeError('contract deployment failed')
self.address = r['contract_address']
o = c.decimals(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
self.decimals = c.parse_decimals(r)
self.period_seconds = settings.period_minutes * 60
self.last_block += 1
self.last_timestamp += 1
self.period = 1
self.period_txs = []
self.period_tx_limit = self.period_seconds - 1
@ -146,12 +145,15 @@ class DemurrageTokenSimulation:
def get_period(self):
return self.period
o = self.caller_contract.actual_period(self.address, sender_address=self.caller_address)
r = self.rpc.do(o)
return self.caller_contract.parse_actual_period(r)
def get_demurrage(self):
o = self.caller_contract.demurrage_amount(self.address, sender_address=self.caller_address)
r = self.rpc.do(o)
logg.info('demrrage amount {}'.format(r))
return float(self.caller_contract.parse_demurrage_amount(r) / (10 ** 38))
@ -218,21 +220,54 @@ class DemurrageTokenSimulation:
def next(self):
target_timestamp = self.start_timestamp + (self.period * self.period_seconds)
logg.debug('warping to {}, {} from start'.format(target_timestamp, target_timestamp - self.start_timestamp))
logg.info('warping to {}, {} from start {}'.format(target_timestamp, target_timestamp - self.start_timestamp, self.start_timestamp))
self.last_timestamp = target_timestamp
self.eth_helper.time_travel(self.last_timestamp)
o = block_latest()
r = self.rpc.do(o)
self.last_block = r
o = block_by_number(r)
r = self.rpc.do(o)
cursor_timestamp = r['timestamp'] + 1
nonce_oracle = RPCNonceOracle(self.accounts[2], conn=self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle, gas_oracle=self.gas_oracle)
i = 0
while cursor_timestamp < target_timestamp:
logg.info('mining block on {}'.format(cursor_timestamp))
(tx_hash, o) = c.apply_demurrage(self.address, self.accounts[2])
self.rpc.do(o)
self.eth_helper.time_travel(cursor_timestamp + 60)
self.__next_block()
o = receipt(tx_hash)
r = self.rpc.do(o)
if r['status'] == 0:
raise RuntimeError('demurrage fast-forward failed on step {} timestamp {} block timestamp {} target {}'.format(i, cursor_timestamp, target_timestamp))
cursor_timestamp += 60*60 # 1 hour
o = block_by_number(r['block_number'])
b = self.rpc.do(o)
logg.info('block mined on timestamp {} (delta {}) block number {}'.format(b['timestamp'], b['timestamp'] - self.start_timestamp, b['number']))
i += 1
(tx_hash, o) = c.apply_demurrage(self.address, self.accounts[2])
self.rpc.do(o)
nonce_oracle = RPCNonceOracle(self.accounts[3], conn=self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle, gas_oracle=self.gas_oracle)
(tx_hash, o) = c.change_period(self.address, self.accounts[3])
self.rpc.do(o)
self.eth_helper.time_travel(target_timestamp + 1)
self.__next_block()
o = block_latest()
r = self.rpc.do(o)
o = block_by_number(self.last_block)
r = self.rpc.do(o)
self.last_block = r['number']
block_base = self.last_block
nonce_oracle = RPCNonceOracle(self.accounts[2], conn=self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle, gas_oracle=self.gas_oracle)
(tx_hash, o) = c.change_period(self.address, self.accounts[2])
self.rpc.do(o)
logg.info('block before demurrage execution {} {}'.format(r['timestamp'], r['number']))
if self.redistribute:
for actor in self.actors:

11
python/examples/sim_noredistribute.py
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@ -5,10 +5,10 @@ import logging
from erc20_demurrage_token import DemurrageTokenSettings
from erc20_demurrage_token.sim import DemurrageTokenSimulation
logging.basicConfig(level=logging.WARNING)
logging.basicConfig(level=logging.INFO)
logg = logging.getLogger()
decay_per_minute = 0.000050105908373373 # equals approx 2% per month
decay_per_minute = 0.00000050105908373373 # equals approx 2% per month
# parameters for simulation object
settings = DemurrageTokenSettings()
@ -16,7 +16,8 @@ settings.name = 'Simulated Demurrage Token'
settings.symbol = 'SIM'
settings.decimals = 6
settings.demurrage_level = int(decay_per_minute*(10**38))
settings.period_minutes = 1 # 1 week in minutes
#settings.period_minutes = 1 # 1 week in minutes
settings.period_minutes = 60*24*7*4
chain = 'evm:foochain:42'
cap = (10 ** 6) * (10 ** 12)
@ -49,8 +50,8 @@ print('sink balance: demurraged {:>9d} base {:>9d}'.format(sim.balance(sim.sink
# get times
minutes = sim.get_minutes()
start = sim.get_now()
timestamp = sim.get_start()
timestamp = sim.get_now()
start = sim.get_start()
period = sim.get_period()
print('start {} now {} period {} minutes passed {}'.format(start, timestamp, period, minutes))

2
python/tests/test_redistribution_unit.py
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@ -138,7 +138,7 @@ class TestRedistribution(TestDemurrageUnit):
o = c.demurrage_amount(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
demurrage = c.parse_demurrage_amount(r)
logg.debug('\ndemurrage {}\nsupply {}'.format(demurrage, supply))
logg.debug('\nrediistribution {}\ndemurrage {}\nsupply {}'.format(redistribution, demurrage, supply))
expected_balance = int(supply * (self.tax_level / 1000000))
expected_balance_tolerance = 1

14
solidity/DemurrageTokenSingleCap.sol
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@ -270,15 +270,18 @@ contract DemurrageTokenSingleCap {
return lastRedistribution;
}
function getDistribution(uint256 _supply, uint256 _demurrageAmount) public view returns (uint256) {
return _supply * (ppmDivider - (_demurrageAmount / 1000000));
}
// Returns the amount sent to the sink address
function applyDefaultRedistribution(bytes32 _redistribution) private returns (uint256) {
uint256 redistributionSupply;
uint256 unit;
redistributionSupply = toRedistributionSupply(_redistribution);
unit = redistributionSupply * (ppmDivider - (demurrageAmount / 1000000));
increaseBaseBalance(sinkAddress, unit / ppmDivider);
unit = getDistribution(redistributionSupply, demurrageAmount);
increaseBaseBalance(sinkAddress, toBaseAmount(unit / ppmDivider));
return unit;
}
@ -292,7 +295,6 @@ contract DemurrageTokenSingleCap {
uint128 epochPeriodCount;
uint256 periodCount;
uint256 lastDemurrageAmount;
uint256 newDemurrageAmount;
//epochPeriodCount = actualPeriod();
//periodCount = epochPeriodCount - demurragePeriod;
@ -304,8 +306,8 @@ contract DemurrageTokenSingleCap {
lastDemurrageAmount = demurrageAmount;
demurrageAmount = uint128(decayBy(lastDemurrageAmount, periodCount));
//demurragePeriod = epochPeriodCount;
demurrageTimestamp = periodStart + (periodCount * 60);
emit Decayed(block.timestamp, periodCount, lastDemurrageAmount, demurrageAmount);
demurrageTimestamp = demurrageTimestamp + (periodCount * 60);
emit Decayed(demurrageTimestamp, periodCount, lastDemurrageAmount, demurrageAmount);
return true;
}