Improve demurrage modifier calculation for redistribution cache, add gas bench for same
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nolash
parent
2ad59df9c9
commit
806ed1907a
GPG Key ID:
21D2E7BB88C2A746
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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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@ -30,7 +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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@ -72,7 +72,7 @@ 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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@ -137,7 +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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@ -197,6 +196,8 @@ contract RedistributedDemurrageToken {
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tmpRedistribution |= (participants & 0x0fffffffff) << 104;
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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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@ -208,6 +209,7 @@ contract RedistributedDemurrageToken {
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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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@ -240,6 +242,7 @@ contract RedistributedDemurrageToken {
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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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@ -274,9 +277,7 @@ 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] &= 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] |= 0x8000000001000000000000000000000000000000000000000000000000000000;
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redistributions[redistributionPeriod-1] |= 0x8000000000000000000000000000000000000100000000000000000000000000;
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}
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@ -323,7 +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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@ -350,7 +351,8 @@ contract RedistributedDemurrageToken {
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uint256 currentPeriod;
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uint256 currentParticipants;
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uint256 currentRemainder;
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uint256 currentRedistributionDemurrage;
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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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@ -358,12 +360,22 @@ contract RedistributedDemurrageToken {
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if (currentRedistribution == bytes32(0x00)) {
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return false;
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}
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periodTimestamp = getPeriodTimeDelta(currentPeriod);
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demurrageCounts = demurrageCycles(periodTimestamp);
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currentRedistributionDemurrage = toRedistributionDemurrageModifier(currentRedistribution);
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currentPeriod = toRedistributionPeriod(currentRedistribution);
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nextRedistribution = toRedistribution(0, toTaxPeriodAmount(currentRedistributionDemurrage, demurrageCounts), 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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@ -376,9 +388,23 @@ contract RedistributedDemurrageToken {
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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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// TODO: higher precision
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function toTaxPeriodAmount(uint256 _value, uint256 _period) public view returns (uint256) {
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function decayBy(uint256 _value, uint256 _period) public view returns (uint256) {
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uint256 valueFactor;
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uint256 truncatedTaxLevel;
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@ -414,7 +440,7 @@ contract RedistributedDemurrageToken {
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supply = toRedistributionSupply(periodRedistribution);
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baseValue = ((supply / participants) * (taxLevel / 1000000)) / ppmDivider;
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value = toTaxPeriodAmount(baseValue, period - 1);
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value = decayBy(baseValue, period - 1);
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//account[_account] &= bytes32(0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff);
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account[_account] &= bytes32(0xffffffffffffffffffffffffffffffffffffff00000000ffffffffffffffffff);
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@ -433,7 +459,6 @@ contract RedistributedDemurrageToken {
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function approve(address _spender, uint256 _value) public returns (bool) {
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uint256 baseValue;
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applyDemurrage();
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changePeriod();
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applyRedistributionOnAccount(msg.sender);
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@ -448,7 +473,6 @@ contract RedistributedDemurrageToken {
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uint256 baseValue;
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bool result;
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applyDemurrage();
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changePeriod();
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applyRedistributionOnAccount(msg.sender);
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@ -465,7 +489,6 @@ contract RedistributedDemurrageToken {
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uint256 baseValue;
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bool result;
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applyDemurrage();
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changePeriod();
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applyRedistributionOnAccount(msg.sender);
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