Cache demurrage modifier in redistribution data
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python/tests/bench.py
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72
python/tests/bench.py
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@ -0,0 +1,72 @@
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# standard imports
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import os
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import unittest
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import json
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import logging
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# third-party imports
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import web3
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import eth_tester
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import eth_abi
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logging.basicConfig(level=logging.DEBUG)
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logg = logging.getLogger()
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logging.getLogger('web3').setLevel(logging.WARNING)
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logging.getLogger('eth.vm').setLevel(logging.WARNING)
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testdir = os.path.dirname(__file__)
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TAX_LEVEL = 10000 * 2 # 2%
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class Test(unittest.TestCase):
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contract = None
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def setUp(self):
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eth_params = eth_tester.backends.pyevm.main.get_default_genesis_params({
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'gas_limit': 9000000,
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})
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f = open(os.path.join(testdir, '../../solidity/RedistributedDemurrageToken.bin'), 'r')
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self.bytecode = f.read()
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f.close()
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f = open(os.path.join(testdir, '../../solidity/RedistributedDemurrageToken.json'), 'r')
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self.abi = json.load(f)
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f.close()
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backend = eth_tester.PyEVMBackend(eth_params)
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self.eth_tester = eth_tester.EthereumTester(backend)
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provider = web3.Web3.EthereumTesterProvider(self.eth_tester)
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self.w3 = web3.Web3(provider)
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self.sink_address = self.w3.eth.accounts[9]
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def tearDown(self):
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pass
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def test_gas_changeperiod(self):
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period = 43200
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for i in range(5):
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c = self.w3.eth.contract(abi=self.abi, bytecode=self.bytecode)
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tx_hash = c.constructor('Foo Token', 'FOO', 6, TAX_LEVEL * (10 ** 32), period, self.sink_address).transact({'from': self.w3.eth.accounts[0]})
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r = self.w3.eth.getTransactionReceipt(tx_hash)
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contract = self.w3.eth.contract(abi=self.abi, address=r.contractAddress)
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start_block = self.w3.eth.blockNumber
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b = self.w3.eth.getBlock(start_block)
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start_time = b['timestamp']
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period_seconds = period * 60
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self.eth_tester.time_travel(start_time + period_seconds + (60 * (10 ** i)))
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tx_hash = contract.functions.changePeriod().transact()
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r = self.w3.eth.getTransactionReceipt(tx_hash)
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print('{} ({}): {}'.format(i, 60 * (10 ** i), r['gasUsed']))
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if __name__ == '__main__':
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unittest.main()
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@ -84,14 +84,14 @@ class Test(unittest.TestCase):
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self.eth_tester.time_travel(self.start_time + 61)
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redistribution = self.contract.functions.redistributions(0).call();
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self.assertEqual(redistribution.hex(), '000000000100000000000000000000000000000000001e848000000000000001')
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self.assertEqual(redistribution.hex(), '000000000000000000000000f42400000000010000000000001e848000000001')
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tx_hash = self.contract.functions.mintTo(self.w3.eth.accounts[0], 1000000).transact()
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r = self.w3.eth.getTransactionReceipt(tx_hash)
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self.assertEqual(r.status, 1)
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redistribution = self.contract.functions.redistributions(1).call()
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self.assertEqual(redistribution.hex(), '000000000000000000000000000000000000000000002dc6c000000000000002')
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self.assertEqual(redistribution.hex(), '000000000000000000000000ef4200000000000000000000002dc6c000000002')
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def test_redistribution_balance_on_zero_participants(self):
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@ -18,8 +18,10 @@ contract RedistributedDemurrageToken {
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uint256 public immutable taxLevel; // PPM per MINUTE
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uint256 public demurrageModifier; // PPM uint128(block) | uint128(ppm)
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bytes32[] public redistributions; // uint1(isFractional) | uint1(unused) | uint38(participants) | uint160(value) | uint56(period)
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mapping (address => bytes32) account; // uint20(unused) | uint56(period) | uint160(value)
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//bytes32[] public redistributions; // uint1(isFractional) | uint1(unused) | uint38(participants) | uint160(value) | uint56(period)
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bytes32[] public redistributions; // uint1(isFractional) | uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
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//mapping (address => bytes32) account; // uint20(unused) | uint56(period) | uint160(value)
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mapping (address => bytes32) account; // uint152(unused) | uint32(period) | uint72(value)
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mapping (address => bool) minter;
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mapping (address => mapping (address => uint256 ) ) allowance; // holder -> spender -> amount (amount is subject to demurrage)
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@ -28,7 +30,7 @@ contract RedistributedDemurrageToken {
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event Transfer(address indexed _from, address indexed _to, uint256 _value);
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event Approval(address indexed _owner, address indexed _spender, uint256 _value);
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event Mint(address indexed _minter, address indexed _beneficiary, uint256 _value);
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//event Debug(uint256 _foo);
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event Debug(bytes32 _foo);
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event Decayed(uint256 indexed _period, uint256 indexed _periodCount, uint256 indexed _oldAmount, uint256 _newAmount);
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event Redistribution(address indexed _account, uint256 indexed _period, uint256 _value);
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@ -44,7 +46,7 @@ contract RedistributedDemurrageToken {
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demurrageModifier |= (1 << 128);
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taxLevel = _taxLevelMinute; // 38 decimal places
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sinkAddress = _defaultSinkAddress;
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bytes32 initialRedistribution = toRedistribution(0, 0, 1);
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bytes32 initialRedistribution = toRedistribution(0, 1000000, 0, 1);
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redistributions.push(initialRedistribution);
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minimumParticipantSpend = 10 ** uint256(_decimals);
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}
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@ -70,20 +72,24 @@ contract RedistributedDemurrageToken {
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periodCount = actualPeriod() - toDemurragePeriod(demurrageModifier);
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currentDemurrageAmount = toTaxPeriodAmount(anchorDemurrageAmount, periodCount);
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currentDemurrageAmount = decayBy(anchorDemurrageAmount, periodCount);
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return (baseBalance * currentDemurrageAmount) / (ppmDivider * 1000000);
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}
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/// Balance unmodified by demurrage
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function getBaseBalance(address _account) private view returns (uint256) {
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return uint256(account[_account]) & 0x00ffffffffffffffffffffffffffffffffffffffff;
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//return uint256(account[_account]) & 0x00ffffffffffffffffffffffffffffffffffffffff;
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return uint256(account[_account]) & 0xffffffffffffffffff;
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}
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/// Increases base balance for a single account
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function increaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
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uint256 oldBalance;
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uint256 newBalance;
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uint256 workAccount;
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workAccount = uint256(account[_account]); // | (newBalance & 0xffffffffffffffffff);
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if (_delta == 0) {
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return false;
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@ -92,8 +98,12 @@ contract RedistributedDemurrageToken {
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oldBalance = getBaseBalance(_account);
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newBalance = oldBalance + _delta;
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require(uint160(newBalance) > uint160(oldBalance), 'ERR_WOULDWRAP'); // revert if increase would result in a wrapped value
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account[_account] &= bytes32(0xffffffffffffffffffffffff0000000000000000000000000000000000000000);
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account[_account] |= bytes32(newBalance & 0x00ffffffffffffffffffffffffffffffffffffffff);
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//account[_account] &= bytes32(0xfffffffffffffffffffffff0000000000000000000000000000000000000000);
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//account[_account] = bytes32(uint256(account[_account]) & 0xfffffffffffffffffffffffffffffffffffffffffffff000000000000000000);
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workAccount &= 0xfffffffffffffffffffffffffffffffffffffffffffff000000000000000000;
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//account[_account] |= bytes32(newBalance & 0x00ffffffffffffffffffffffffffffffffffffffff);
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workAccount |= newBalance & 0xffffffffffffffffff;
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account[_account] = bytes32(workAccount);
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return true;
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}
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@ -101,6 +111,9 @@ contract RedistributedDemurrageToken {
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function decreaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
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uint256 oldBalance;
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uint256 newBalance;
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uint256 workAccount;
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workAccount = uint256(account[_account]); // | (newBalance & 0xffffffffffffffffff);
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if (_delta == 0) {
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return false;
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@ -109,8 +122,11 @@ contract RedistributedDemurrageToken {
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oldBalance = getBaseBalance(_account);
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require(oldBalance >= _delta, 'ERR_OVERSPEND'); // overspend guard
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newBalance = oldBalance - _delta;
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account[_account] &= bytes32(0xffffffffffffffffffffffff0000000000000000000000000000000000000000);
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account[_account] |= bytes32(newBalance & 0x00ffffffffffffffffffffffffffffffffffffffff);
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//account[_account] &= bytes32(0xffffffffffffffffffffffff0000000000000000000000000000000000000000);
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workAccount &= 0xfffffffffffffffffffffffffffffffffffffffffffff000000000000000000;
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//account[_account] |= bytes32(newBalance & 0x00ffffffffffffffffffffffffffffffffffffffff);
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workAccount |= newBalance & 0xffffffffffffffffff;
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account[_account] = bytes32(workAccount);
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return true;
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}
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@ -121,7 +137,6 @@ contract RedistributedDemurrageToken {
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require(minter[msg.sender]);
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applyDemurrage();
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changePeriod();
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baseAmount = _amount;
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totalSupply += _amount;
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@ -132,28 +147,35 @@ contract RedistributedDemurrageToken {
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}
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// Deserializes the redistribution word
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function toRedistribution(uint256 _participants, uint256 _value, uint256 _period) private pure returns(bytes32) {
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// uint1(isFractional) | uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
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function toRedistribution(uint256 _participants, uint256 _demurrageModifierPpm, uint256 _value, uint256 _period) private pure returns(bytes32) {
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bytes32 redistribution;
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redistribution |= bytes32((_participants & 0x7fffffffff) << 216);
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redistribution |= bytes32((_value & 0xffffffffffffffffffffffff) << 56);
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redistribution |= bytes32(_period & 0xffffffffffffff);
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redistribution |= bytes32((_demurrageModifierPpm & 0x0fffff) << 140);
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redistribution |= bytes32((_participants & 0x0fffffffff) << 104);
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redistribution |= bytes32((_value & 0xffffffffffffffffff) << 32);
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redistribution |= bytes32(_period & 0xffffffff);
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return redistribution;
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}
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// Serializes the demurrage period part of the redistribution word
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function toRedistributionPeriod(bytes32 redistribution) public pure returns (uint256) {
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return uint256(redistribution & 0x00000000000000000000000000000000000000000000000000ffffffffffffff);
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return uint256(redistribution) & 0xffffffff;
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}
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// Serializes the supply part of the redistribution word
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function toRedistributionSupply(bytes32 redistribution) public pure returns (uint256) {
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return uint256(redistribution & 0x0000000000ffffffffffffffffffffffffffffffffffffffff00000000000000) >> 56;
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return uint256(redistribution & 0x00000000000000000000000000000000000000ffffffffffffffffff00000000) >> 32;
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}
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// Serializes the number of participants part of the redistribution word
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function toRedistributionParticipants(bytes32 redistribution) public pure returns (uint256) {
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return uint256(redistribution & 0x7fffffffff000000000000000000000000000000000000000000000000000000) >> 216;
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return uint256(redistribution & 0x00000000000000000000000000000fffffffff00000000000000000000000000) >> 104;
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}
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// Serializes the number of participants part of the redistribution word
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function toRedistributionDemurrageModifier(bytes32 redistribution) public pure returns (uint256) {
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return uint256(redistribution & 0x000000000000000000000000fffff00000000000000000000000000000000000) >> 140;
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}
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// Client accessor to the redistributions array length
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@ -163,16 +185,19 @@ contract RedistributedDemurrageToken {
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// Add number of participants for the current redistribution period by one
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function incrementRedistributionParticipants() private returns (bool) {
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uint256 currentRedistribution;
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bytes32 currentRedistribution;
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uint256 tmpRedistribution;
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uint256 participants;
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currentRedistribution = uint256(redistributions[redistributions.length-1]);
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participants = ((currentRedistribution & 0x7fffffffff000000000000000000000000000000000000000000000000000000) >> 216) + 1;
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currentRedistribution &= 0x8000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffff;
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currentRedistribution |= participants << 216;
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currentRedistribution = redistributions[redistributions.length-1];
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participants = toRedistributionParticipants(currentRedistribution) + 1;
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tmpRedistribution = uint256(currentRedistribution);
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tmpRedistribution &= 0xfffffffffffffffffffffffffffff000000000ffffffffffffffffffffffffff;
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tmpRedistribution |= (participants & 0x0fffffffff) << 104;
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//emit Debug(participants);
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redistributions[redistributions.length-1] = bytes32(currentRedistribution);
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redistributions[redistributions.length-1] = bytes32(tmpRedistribution);
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return true;
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}
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// Save the current total supply amount to the current redistribution period
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@ -180,10 +205,11 @@ contract RedistributedDemurrageToken {
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uint256 currentRedistribution;
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currentRedistribution = uint256(redistributions[redistributions.length-1]);
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currentRedistribution &= 0xffffffffff0000000000000000000000000000000000000000ffffffffffffff;
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currentRedistribution |= totalSupply << 56;
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currentRedistribution &= 0xffffffffffffffffffffffffffffffffffffff000000000000000000ffffffff;
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currentRedistribution |= totalSupply << 32;
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redistributions[redistributions.length-1] = bytes32(currentRedistribution);
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return true;
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}
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// Get the demurrage period of the current block number
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@ -206,14 +232,17 @@ contract RedistributedDemurrageToken {
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// Deserialize the pemurrage period for the given account is participating in
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function accountPeriod(address _account) public view returns (uint256) {
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return (uint256(account[_account]) & 0xffffffffffffffffffffffff0000000000000000000000000000000000000000) >> 160;
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//return (uint256(account[_account]) & 0xffffffffffffffffffffffff0000000000000000000000000000000000000000) >> 160;
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return (uint256(account[_account]) & 0x00000000000000000000000000000000000000ffffffff000000000000000000) >> 72;
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}
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// Save the given demurrage period as the currently participation period for the given address
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function registerAccountPeriod(address _account, uint256 _period) private returns (bool) {
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account[_account] &= 0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff;
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account[_account] |= bytes32(_period << 160);
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//account[_account] &= 0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff;
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account[_account] &= 0xffffffffffffffffffffffffffffffffffffff00000000ffffffffffffffffff;
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account[_account] |= bytes32(_period << 72);
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incrementRedistributionParticipants();
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return true;
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}
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// Determine whether the unit number is rounded down, rounded up or evenly divides.
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@ -248,8 +277,8 @@ contract RedistributedDemurrageToken {
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if (truncatedResult < redistributionSupply) {
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redistributionPeriod = toRedistributionPeriod(_redistribution); // since we reuse period here, can possibly be optimized by passing period instead
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redistributions[redistributionPeriod-1] &= 0x0000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffff; // just to be safe, zero out all participant count data, in this case there will be only one
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redistributions[redistributionPeriod-1] |= 0x8000000001000000000000000000000000000000000000000000000000000000;
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redistributions[redistributionPeriod-1] &= 0xfffffffffffffffffffffffffffff000000000ffffffffffffffffffffffffff; // just to be safe, zero out all participant count data, in this case there will be only one
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redistributions[redistributionPeriod-1] |= 0x8000000000000000000000000000000000000100000000000000000000000000;
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}
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increaseBaseBalance(sinkAddress, unit / ppmDivider); //truncatedResult);
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@ -265,6 +294,7 @@ contract RedistributedDemurrageToken {
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return false;
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}
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// is this needed?
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redistributions[_period-1] |= 0x8000000000000000000000000000000000000000000000000000000000000000;
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periodSupply = toRedistributionSupply(redistributions[_period-1]);
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@ -294,7 +324,7 @@ contract RedistributedDemurrageToken {
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return false;
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}
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lastDemurrageAmount = toDemurrageAmount(demurrageModifier);
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newDemurrageAmount = toTaxPeriodAmount(lastDemurrageAmount, periodCount);
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newDemurrageAmount = decayBy(lastDemurrageAmount, periodCount);
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demurrageModifier = 0;
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demurrageModifier |= (newDemurrageAmount & 0x00000000000000000000000000000000ffffffffffffffffffffffffffffffff);
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demurrageModifier |= (epochPeriodCount << 128);
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@ -302,23 +332,50 @@ contract RedistributedDemurrageToken {
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return true;
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}
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// Return timestamp of start of period threshold
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function getPeriodTimeDelta(uint256 _periodCount) public view returns (uint256) {
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return periodStart + (_periodCount * periodDuration);
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}
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// Amount of demurrage cycles inbetween the current timestamp and the given target time
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function demurrageCycles(uint256 _target) public view returns (uint256) {
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return (block.timestamp - _target) / 60;
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}
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// Recalculate the demurrage modifier for the new period
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// After this, all REPORTED balances will have been reduced by the corresponding ratio (but the effecive totalsupply stays the same)
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//function applyTax() public returns (uint256) {
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function changePeriod() public returns (uint256) {
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function changePeriod() public returns (bool) {
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bytes32 currentRedistribution;
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bytes32 nextRedistribution;
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uint256 currentPeriod;
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uint256 currentParticipants;
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uint256 currentRemainder;
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uint256 currentDemurrageAmount;
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uint256 nextRedistributionDemurrage;
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uint256 demurrageCounts;
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uint256 periodTimestamp;
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currentRedistribution = checkPeriod();
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if (currentRedistribution == bytes32(0x00)) {
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return demurrageModifier;
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return false;
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}
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//demurrageModifier -= (demurrageModifier * taxLevel) / 1000000;
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currentPeriod = toRedistributionPeriod(currentRedistribution);
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nextRedistribution = toRedistribution(0, totalSupply, currentPeriod + 1);
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periodTimestamp = getPeriodTimeDelta(currentPeriod);
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applyDemurrage();
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currentDemurrageAmount = toDemurrageAmount(demurrageModifier);
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demurrageCounts = demurrageCycles(periodTimestamp);
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if (demurrageCounts > 0) {
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nextRedistributionDemurrage = growBy(currentDemurrageAmount, demurrageCounts) / ppmDivider;
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} else {
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nextRedistributionDemurrage = currentDemurrageAmount / ppmDivider;
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}
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nextRedistribution = toRedistribution(0, nextRedistributionDemurrage, totalSupply, currentPeriod + 1);
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emit Debug(bytes32(currentDemurrageAmount));
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redistributions.push(nextRedistribution);
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currentParticipants = toRedistributionParticipants(currentRedistribution);
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@ -328,11 +385,26 @@ contract RedistributedDemurrageToken {
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currentRemainder = remainder(currentParticipants, totalSupply); // we can use totalSupply directly because it will always be the same as the recorded supply on the current redistribution
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applyRemainderOnPeriod(currentRemainder, currentPeriod);
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}
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return demurrageModifier;
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return true;
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}
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function growBy(uint256 _value, uint256 _period) public view returns (uint256) {
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uint256 valueFactor;
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uint256 truncatedTaxLevel;
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// TODO: if can't get to work, reverse the iteration from current period.
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valueFactor = 1000000;
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truncatedTaxLevel = taxLevel / ppmDivider;
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for (uint256 i = 0; i < _period; i++) {
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valueFactor = valueFactor + ((valueFactor * truncatedTaxLevel) / 1000000);
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}
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return (valueFactor * _value) / 1000000;
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}
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// Calculate a value reduced by demurrage by the given period
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function toTaxPeriodAmount(uint256 _value, uint256 _period) public view returns (uint256) {
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// TODO: higher precision
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||||
function decayBy(uint256 _value, uint256 _period) public view returns (uint256) {
|
||||
uint256 valueFactor;
|
||||
uint256 truncatedTaxLevel;
|
||||
|
||||
@ -368,9 +440,10 @@ contract RedistributedDemurrageToken {
|
||||
|
||||
supply = toRedistributionSupply(periodRedistribution);
|
||||
baseValue = ((supply / participants) * (taxLevel / 1000000)) / ppmDivider;
|
||||
value = toTaxPeriodAmount(baseValue, period - 1);
|
||||
value = decayBy(baseValue, period - 1);
|
||||
|
||||
account[_account] &= bytes32(0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff);
|
||||
//account[_account] &= bytes32(0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff);
|
||||
account[_account] &= bytes32(0xffffffffffffffffffffffffffffffffffffff00000000ffffffffffffffffff);
|
||||
increaseBaseBalance(_account, value);
|
||||
|
||||
emit Redistribution(_account, period, value);
|
||||
@ -386,7 +459,6 @@ contract RedistributedDemurrageToken {
|
||||
function approve(address _spender, uint256 _value) public returns (bool) {
|
||||
uint256 baseValue;
|
||||
|
||||
applyDemurrage();
|
||||
changePeriod();
|
||||
applyRedistributionOnAccount(msg.sender);
|
||||
|
||||
@ -401,7 +473,6 @@ contract RedistributedDemurrageToken {
|
||||
uint256 baseValue;
|
||||
bool result;
|
||||
|
||||
applyDemurrage();
|
||||
changePeriod();
|
||||
applyRedistributionOnAccount(msg.sender);
|
||||
|
||||
@ -418,7 +489,6 @@ contract RedistributedDemurrageToken {
|
||||
uint256 baseValue;
|
||||
bool result;
|
||||
|
||||
applyDemurrage();
|
||||
changePeriod();
|
||||
applyRedistributionOnAccount(msg.sender);
|
||||
|
||||
|
Reference in New Issue
Block a user