erc20-demurrage-token

ERC20 token with redistributed continual demurrage
Log | Files | Refs | README

commit c69d115965bc57d238d021414c69f0604df7a360
parent 2f5bb63f9af07a3a61a745a51185793237c9e916
Author: nolash <dev@holbrook.no>
Date:   Sun,  6 Jun 2021 09:34:18 +0200

Introduce sim example

Diffstat:
Mpython/erc20_demurrage_token/data/DemurrageTokenMultiCap.bin | 4++--
Mpython/erc20_demurrage_token/sim/sim.py | 76+++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------------
Mpython/erc20_demurrage_token/token.py | 50++++++++++++++++++++++++++++++++++++++++++++++++++
Apython/examples/sim.py | 76++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Mpython/tests/base.py | 48++++++++++++++++++++++++++++++++++++++++++++++++
Mpython/tests/sim/tests_sim.py | 2+-
Mpython/tests/test_redistribution.py | 3++-
Apython/tests/test_redistribution_real.py | 84+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Msolidity/DemurrageTokenMultiCap.sol | 6++++--
9 files changed, 324 insertions(+), 25 deletions(-)

diff --git a/python/erc20_demurrage_token/data/DemurrageTokenMultiCap.bin b/python/erc20_demurrage_token/data/DemurrageTokenMultiCap.bin @@ -1 +1 @@ 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+\ No newline at end of file diff --git a/python/erc20_demurrage_token/sim/sim.py b/python/erc20_demurrage_token/sim/sim.py @@ -97,6 +97,7 @@ class DemurrageTokenSimulation: self.period = 1 self.period_txs = [] self.period_tx_limit = self.period_seconds - 1 + self.sink_address = settings.sink_address logg.info('intialized at block {} timestamp {} period {} demurrage level {} sink address {} (first address in keystore)'.format( self.last_block, @@ -126,6 +127,32 @@ class DemurrageTokenSimulation: logg.debug('tx {} block {} index {} verified'.format(tx_hash, self.last_block, rcpt['transaction_index'])) + def get_now(self): + o = block_latest() + r = self.rpc.do(o) + o = block_by_number(r, include_tx=False) + r = self.rpc.do(o) + return r['timestamp'] + + + def get_minutes(self): + t = self.get_now() + return int((t - self.start_timestamp) / 60) + + + def get_start(self): + return self.start_timestamp + + + def get_period(self): + return self.period + + def get_demurrage_modifier(self): + o = self.caller_contract.demurrage_amount(self.address, sender_address=self.caller_address) + r = self.rpc.do(o) + return float(self.caller_contract.parse_demurrage_amount(r) / (10 ** 38)) + + def from_units(self, v): return v * (10 ** self.decimals) @@ -136,9 +163,10 @@ class DemurrageTokenSimulation: c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle, gas_oracle=self.gas_oracle) (tx_hash, o) = c.mint_to(self.address, self.accounts[0], recipient, value) self.rpc.do(o) - self.next_block() + self.__next_block() self.__check_tx(tx_hash) self.period_txs.append(tx_hash) + logg.info('mint {} tokens to {} - {}'.format(value, recipient, tx_hash)) return tx_hash @@ -147,9 +175,10 @@ class DemurrageTokenSimulation: c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle, gas_oracle=self.gas_oracle) (tx_hash, o) = c.transfer(self.address, sender, recipient, value) self.rpc.do(o) - self.next_block() + self.__next_block() self.__check_tx(tx_hash) self.period_txs.append(tx_hash) + logg.info('transfer {} tokens from {} to {} - {}'.format(value, sender, recipient, tx_hash)) return tx_hash @@ -163,42 +192,51 @@ class DemurrageTokenSimulation: return self.caller_contract.parse_balance_of(r) - def next_block(self): + def __next_block(self): hsh = self.eth_helper.mine_block() o = block_by_hash(hsh) r = self.rpc.do(o) - logg.info('now at block {} timestamp {}'.format(r['number'], r['timestamp'])) + + for tx_hash in r['transactions']: + o = receipt(tx_hash) + rcpt = self.rpc.do(o) + if rcpt['status'] == 0: + raise RuntimeError('tx {} (block {} index {}) failed'.format(tx_hash, self.last_block, rcpt['transaction_index'])) + logg.debug('tx {} (block {} index {}) verified'.format(tx_hash, self.last_block, rcpt['transaction_index'])) + + logg.debug('now at block {} timestamp {}'.format(r['number'], r['timestamp'])) def next(self): - target_timestamp = self.start_timestamp + (self.period * self.period_seconds) - 1 + target_timestamp = self.start_timestamp + (self.period * self.period_seconds) logg.debug('warping to {}, {} from start'.format(target_timestamp, target_timestamp - self.start_timestamp)) self.last_timestamp = target_timestamp self.eth_helper.time_travel(self.last_timestamp) - self.next_block() + self.__next_block() o = block_by_number(self.last_block) r = self.rpc.do(o) self.last_block = r['number'] block_base = self.last_block + -# for tx_hash in r['transactions']: -# o = receipt(tx_hash) -# rcpt = self.rpc.do(o) -# if rcpt['status'] == 0: -# raise RuntimeError('tx {} (block {} index {}) failed'.format(tx_hash, self.last_block, rcpt['transaction_index'])) -# logg.info('tx {} (block {} index {}) verified'.format(tx_hash, self.last_block, rcpt['transaction_index'])) - - nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.rpc) + 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.apply_demurrage(self.address, self.accounts[0]) + (tx_hash, o) = c.change_period(self.address, self.accounts[2]) self.rpc.do(o) - self.next_block() - (tx_hash, o) = c.change_period(self.address, self.accounts[0]) + for actor in self.actors: + nonce_oracle = RPCNonceOracle(actor, conn=self.rpc) + c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle, gas_oracle=self.gas_oracle) + (tx_hash, o) = c.apply_redistribution_on_account(self.address, actor, actor) + self.rpc.do(o) + + nonce_oracle = RPCNonceOracle(self.sink_address, conn=self.rpc) + c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle, gas_oracle=self.gas_oracle) + (tx_hash, o) = c.apply_redistribution_on_account(self.address, self.sink_address, self.sink_address) self.rpc.do(o) - self.next_block() + self.__next_block() o = block_latest() self.last_block = self.rpc.do(o) @@ -212,7 +250,7 @@ class DemurrageTokenSimulation: raise RuntimeError('demurrage step failed on block {}'.format(self.last_block)) self.last_timestamp = r['timestamp'] - logg.info('next concludes at block {} timestamp {}, {} after start'.format(self.last_block, self.last_timestamp, self.last_timestamp - self.start_timestamp)) + logg.debug('next concludes at block {} timestamp {}, {} after start'.format(self.last_block, self.last_timestamp, self.last_timestamp - self.start_timestamp)) self.period += 1 self.period_txs = [] diff --git a/python/erc20_demurrage_token/token.py b/python/erc20_demurrage_token/token.py @@ -223,6 +223,51 @@ class DemurrageToken(ERC20): return o + def to_redistribution_participants(self, contract_address, redistribution, sender_address=ZERO_ADDRESS): + o = jsonrpc_template() + o['method'] = 'eth_call' + enc = ABIContractEncoder() + enc.method('toRedistributionParticipants') + enc.typ(ABIContractType.BYTES32) + enc.bytes32(redistribution) + data = add_0x(enc.get()) + tx = self.template(sender_address, contract_address) + tx = self.set_code(tx, data) + o['params'].append(self.normalize(tx)) + o['params'].append('latest') + return o + + + def to_redistribution_supply(self, contract_address, redistribution, sender_address=ZERO_ADDRESS): + o = jsonrpc_template() + o['method'] = 'eth_call' + enc = ABIContractEncoder() + enc.method('toRedistributionSupply') + enc.typ(ABIContractType.BYTES32) + enc.bytes32(redistribution) + data = add_0x(enc.get()) + tx = self.template(sender_address, contract_address) + tx = self.set_code(tx, data) + o['params'].append(self.normalize(tx)) + o['params'].append('latest') + return o + + + def to_redistribution_demurrage_modifier(self, contract_address, redistribution, sender_address=ZERO_ADDRESS): + o = jsonrpc_template() + o['method'] = 'eth_call' + enc = ABIContractEncoder() + enc.method('toRedistributionDemurrageModifier') + enc.typ(ABIContractType.BYTES32) + enc.bytes32(redistribution) + data = add_0x(enc.get()) + tx = self.template(sender_address, contract_address) + tx = self.set_code(tx, data) + o['params'].append(self.normalize(tx)) + o['params'].append('latest') + return o + + def base_balance_of(self, contract_address, address, sender_address=ZERO_ADDRESS): o = jsonrpc_template() o['method'] = 'eth_call' @@ -324,5 +369,10 @@ class DemurrageToken(ERC20): @classmethod + def parse_to_redistribution_item(self, v): + return abi_decode_single(ABIContractType.UINT256, v) + + + @classmethod def parse_supply_cap(self, v): return abi_decode_single(ABIContractType.UINT256, v) diff --git a/python/examples/sim.py b/python/examples/sim.py @@ -0,0 +1,76 @@ +# standard imports +import logging + +# local imports +from erc20_demurrage_token import DemurrageTokenSettings +from erc20_demurrage_token.sim import DemurrageTokenSimulation + +logging.basicConfig(level=logging.WARNING) +logg = logging.getLogger() + +decay_per_minute = 0.000050105908373373 # equals approx 2% per month + +# parameters for simulation object +settings = DemurrageTokenSettings() +settings.name = 'Simulated Demurrage Token' +settings.symbol = 'SIM' +settings.decimals = 6 +settings.demurrage_level = int(decay_per_minute*(10**40)) +settings.period_minutes = 10800 # 1 week in minutes +chain = 'evm:foochain:42' +cap = sim.from_units(10 ** 12) # 1 tn token units, with 6 decimal places + +# instantiate simulation +sim = DemurrageTokenSimulation(chain, settings, redistribute=True, cap=cap, actors=10) + +# name the usual suspects +alice = sim.actors[0] +bob = sim.actors[1] +carol = sim.actors[2] + +# mint and transfer (every single action advances one block, and one second in time) +sim.mint(alice, sim.from_units(100)) # 10000000 tokens +sim.mint(bob, sim.from_units(100)) +sim.transfer(alice, carol, sim.from_units(50)) + +# check that balances have been updated +assert sim.balance(alice) == sim.from_units(50) +assert sim.balance(bob) == sim.from_units(100) +assert sim.balance(carol) == sim.from_units(50) + +# advance to next redistribution period +sim.next() + +# inspect balances +print('alice balance: demurraged {:>9d} base {:>9d}'.format(sim.balance(alice), sim.balance(alice, base=True))) +print('bob balance: demurraged {:>9d} base {:>9d}'.format(sim.balance(bob), sim.balance(bob, base=True))) +print('carol balance: demurraged {:>9d} base {:>9d}'.format(sim.balance(carol), sim.balance(carol, base=True))) + + +# get times +minutes = sim.get_minutes() +start = sim.get_now() +timestamp = sim.get_start() +period = sim.get_period() +print('start {} now {} period {} minutes passed {}'.format(start, timestamp, period, minutes)) + + +contract_demurrage = 1 - sim.get_demurrage_modifier() # demurrage in percent (float) +frontend_demurrage = ((1 - decay_per_minute) ** minutes / 100) # corresponding demurrage modifier (float) +demurrage_delta = contract_demurrage - frontend_demurrage # difference between demurrage in contract and demurrage calculated in frontend + +alice_checksum = 50000000 - (50000000 * frontend_demurrage) + (200000000 * frontend_demurrage) # alice's balance calculated with frontend demurrage +print("""alice frontend balance {} +alice contract balance {} +frontend demurrage {} +contract demurrage {} +demurrage delta {}""".format( + alice_checksum, + sim.balance(alice), + frontend_demurrage, + contract_demurrage, + demurrage_delta), +) + +balance_sum = sim.balance(alice) + sim.balance(bob) + sim.balance(carol) +print('sum of contract demurraged balances {}'.format(balance_sum)) diff --git a/python/tests/base.py b/python/tests/base.py @@ -163,3 +163,51 @@ class TestDemurrageCap(TestDemurrage): self.deploy(c, self.mode) logg.info('deployed with mode {}'.format(self.mode)) + + + +class TestDemurrageReal(TestDemurrage): + + def setUp(self): + super(TestDemurrage, self).setUp() + + self.tax_level = int(0.000050105908373373*(10**40)) + self.period = 10800 + self.period_seconds = self.period * 60 + + nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) + self.settings = DemurrageTokenSettings() + self.settings.name = 'Foo Token' + self.settings.symbol = 'FOO' + self.settings.decimals = 6 + self.settings.demurrage_level = self.tax_level + self.settings.period_minutes = 10800 + self.settings.sink_address = self.accounts[9] + self.sink_address = self.settings.sink_address + + o = block_latest() + self.start_block = self.rpc.do(o) + + o = block_by_number(self.start_block, include_tx=False) + r = self.rpc.do(o) + + try: + self.start_time = int(r['timestamp'], 16) + except TypeError: + self.start_time = int(r['timestamp']) + + self.default_supply = 1000000000000 + self.default_supply_cap = int(self.default_supply * 10) + + nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) + c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) + + self.mode = os.environ.get('ERC20_DEMURRAGE_TOKEN_TEST_MODE') + if self.mode == None: + self.mode = 'MultiNocap' + logg.debug('executing test setup default mode {}'.format(self.mode)) + + self.deploy(c, self.mode) + + logg.info('deployed with mode {}'.format(self.mode)) + diff --git a/python/tests/sim/tests_sim.py b/python/tests/sim/tests_sim.py @@ -60,7 +60,7 @@ class TestSim(unittest.TestCase): self.sim.next() balance = self.sim.balance(self.sim.actors[0]) - self.assertEqual(balance, 89995500) + self.assertEqual(balance, 90005520) balance = self.sim.balance(self.sim.actors[1]) self.assertEqual(balance, 99995000) diff --git a/python/tests/test_redistribution.py b/python/tests/test_redistribution.py @@ -26,7 +26,6 @@ logg = logging.getLogger() testdir = os.path.dirname(__file__) - class TestRedistribution(TestDemurrageDefault): def test_debug_periods(self): @@ -261,3 +260,5 @@ class TestRedistribution(TestDemurrageDefault): self.assertEqual(spender_actual_balance, spender_new_decayed_balance) +if __name__ == '__main__': + unittest.main() diff --git a/python/tests/test_redistribution_real.py b/python/tests/test_redistribution_real.py @@ -0,0 +1,84 @@ +# standard imports +import os +import unittest +import json +import logging + +# external imports +from chainlib.eth.nonce import RPCNonceOracle +from chainlib.eth.tx import receipt + +# local imports +from erc20_demurrage_token import DemurrageToken + +# test imports +from tests.base import TestDemurrageReal + +logging.basicConfig(level=logging.DEBUG) +logg = logging.getLogger() + +testdir = os.path.dirname(__file__) + + +class TestRedistribution(TestDemurrageReal): + + def test_simple_example(self): + nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) + c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) + + (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[1], 100000000) + self.rpc.do(o) + o = receipt(tx_hash) + r = self.rpc.do(o) + self.assertEqual(r['status'], 1) + + (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[2], 100000000) + self.rpc.do(o) + o = receipt(tx_hash) + r = self.rpc.do(o) + self.assertEqual(r['status'], 1) + + nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc) + c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) + (tx_hash, o) = c.transfer(self.address, self.accounts[1], self.accounts[3], 50000000) + r = self.rpc.do(o) + o = receipt(tx_hash) + r = self.rpc.do(o) + self.assertEqual(r['status'], 1) + + self.backend.time_travel(self.start_time + self.period_seconds + 1) + + (tx_hash, o) = c.change_period(self.address, self.accounts[1]) + r = self.rpc.do(o) + o = receipt(tx_hash) + r = self.rpc.do(o) + self.assertEqual(r['status'], 1) + + o = c.redistributions(self.address, 1, sender_address=self.accounts[0]) + redistribution = self.rpc.do(o) + logg.debug('redistribution {}'.format(redistribution)) + + o = c.to_redistribution_period(self.address, redistribution, sender_address=self.accounts[0]) + r = self.rpc.do(o) + period = c.parse_to_redistribution_item(r) + logg.debug('period {}'.format(period)) + + o = c.to_redistribution_participants(self.address, redistribution, sender_address=self.accounts[0]) + r = self.rpc.do(o) + participants = c.parse_to_redistribution_item(r) + logg.debug('participants {}'.format(participants)) + + o = c.to_redistribution_supply(self.address, redistribution, sender_address=self.accounts[0]) + r = self.rpc.do(o) + supply = c.parse_to_redistribution_item(r) + logg.debug('supply {}'.format(supply)) + + o = c.to_redistribution_demurrage_modifier(self.address, redistribution, sender_address=self.accounts[0]) + r = self.rpc.do(o) + modifier = c.parse_to_redistribution_item(r) + logg.debug('modifier {}'.format(modifier)) + + + +if __name__ == '__main__': + unittest.main() diff --git a/solidity/DemurrageTokenMultiCap.sol b/solidity/DemurrageTokenMultiCap.sol @@ -246,7 +246,7 @@ contract DemurrageTokenMultiCap { return (uint256(redistribution) & maskRedistributionParticipants) >> shiftRedistributionParticipants; } - // Serializes the number of participants part of the redistribution word + // Serializes the demurrage modifier part of the redistribution word function toRedistributionDemurrageModifier(bytes32 redistribution) public pure returns (uint256) { return (uint256(redistribution) & maskRedistributionDemurrage) >> shiftRedistributionDemurrage; } @@ -417,6 +417,8 @@ contract DemurrageTokenMultiCap { uint256 periodTimestamp; uint256 nextPeriod; + applyDemurrage(); + currentRedistribution = checkPeriod(); if (currentRedistribution == bytes32(0x00)) { return false; @@ -426,7 +428,7 @@ contract DemurrageTokenMultiCap { nextPeriod = currentPeriod + 1; periodTimestamp = getPeriodTimeDelta(currentPeriod); - applyDemurrage(); + //applyDemurrage(); currentDemurrageAmount = demurrageAmount; demurrageCounts = demurrageCycles(periodTimestamp);