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Rehabilitate single nocap contract

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nolash 2021-06-08 16:38:45 +02:00
parent 606b8d6238
commit 2123341fe9
Signed by: lash
GPG Key ID: 21D2E7BB88C2A746
6 changed files with 92 additions and 60 deletions
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2
python/erc20_demurrage_token/data/DemurrageTokenSingleCap.bin
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2
python/erc20_demurrage_token/data/DemurrageTokenSingleNocap.bin
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2
python/erc20_demurrage_token/data/DemurrageTokenSingleNocap.json
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13
python/test.sh
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@ -4,7 +4,8 @@ set -e
export PYTHONPATH=.
modes=(MultiNocap MultiCap SingleCap SingleNocap)
#modes=(MultiNocap MultiCap SingleCap SingleNocap)
modes=(SingleCap SingleNocap) # other contracts need to be updted
for m in ${modes[@]}; do
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_period.py
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_basic.py
@ -22,10 +23,10 @@ for m in ${modes[@]}; do
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_redistribution_unit.py
done
modes=(MultiCap MultiNocap)
for m in ${modes[@]}; do
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_remainder.py
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_redistribution.py
done
#modes=(MultiCap MultiNocap)
#for m in ${modes[@]}; do
# ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_remainder.py
# ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_redistribution.py
#done
set +e

4
solidity/DemurrageTokenSingleCap.sol
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@ -14,10 +14,6 @@ contract DemurrageTokenSingleCap {
uint8 constant shiftRedistributionDemurrage = 104;
uint256 constant maskRedistributionDemurrage = 0x000000ffffffffffffffffffffffffffffffff00000000000000000000000000; // ((1 << 20) - 1) << 140
uint8 constant shiftRedistributionIsUsed = 255;
uint256 constant maskRedistributionIsUsed = 0x4000000000000000000000000000000000000000000000000000000000000000; // 1 << 255
// Account balances
mapping (address => uint256) account;

125
solidity/DemurrageTokenSingleNocap.sol
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@ -2,17 +2,21 @@ pragma solidity > 0.6.11;
// SPDX-License-Identifier: GPL-3.0-or-later
contract DemurrageTokenSingleNocap {
contract DemurrageTokenSingleCap {
// Redistribution bit field, with associated shifts and masks
// (Uses sub-byte boundaries)
bytes32[] public redistributions; // uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
bytes32[] public redistributions; // uint51(unused) | uint64(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
uint8 constant shiftRedistributionPeriod = 0;
uint256 constant maskRedistributionPeriod = 0x00000000000000000000000000000000000000000000000000000000ffffffff; // (1 << 32) - 1
uint8 constant shiftRedistributionValue = 32;
uint256 constant maskRedistributionValue = 0x00000000000000000000000000000000000000ffffffffffffffffff00000000; // ((1 << 72) - 1) << 32
uint8 constant shiftRedistributionDemurrage = 140;
uint256 constant maskRedistributionDemurrage = 0x000000000000000000000000fffff00000000000000000000000000000000000; // ((1 << 20) - 1) << 140
uint8 constant shiftRedistributionDemurrage = 104;
uint256 constant maskRedistributionDemurrage = 0x000000ffffffffffffffffffffffffffffffff00000000000000000000000000; // ((1 << 20) - 1) << 140
uint8 constant shiftRedistributionIsUsed = 255;
uint256 constant maskRedistributionIsUsed = 0x4000000000000000000000000000000000000000000000000000000000000000; // 1 << 255
// Account balances
mapping (address => uint256) account;
@ -21,7 +25,9 @@ contract DemurrageTokenSingleNocap {
uint128 public demurrageAmount;
// Cached demurrage period; the period for which demurrageAmount was calculated
uint128 public demurragePeriod;
//uint128 public demurragePeriod;
// Cached demurrage timestamp; the timestamp for which demurrageAmount was last calculated
uint256 public demurrageTimestamp;
// Implements EIP172
address public owner;
@ -45,7 +51,13 @@ contract DemurrageTokenSingleNocap {
// 128 bit resolution of the demurrage divisor
// (this constant x 1000000 is contained within 128 bits)
uint256 constant ppmDivider = 100000000000000000000000000000000;
uint256 constant nanoDivider = 100000000000000000000000000; // now nanodivider, 6 zeros less
// remaining decimal positions of nanoDivider to reach 38, equals precision in growth and decay
uint256 constant growthResolutionFactor = 1000000000000;
// demurrage decimal width; 38 places
uint256 immutable resolutionFactor = nanoDivider * growthResolutionFactor;
// Timestamp of start of periods (time which contract constructor was called)
uint256 public immutable periodStart;
@ -89,7 +101,7 @@ contract DemurrageTokenSingleNocap {
// EIP173
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // EIP173
constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _taxLevelMinute, uint256 _periodMinutes, address _defaultSinkAddress) public {
constructor(string memory _name, string memory _symbol, uint8 _decimals, uint128 _taxLevelMinute, uint256 _periodMinutes, address _defaultSinkAddress) public {
// ACL setup
owner = msg.sender;
minter[owner] = true;
@ -100,12 +112,14 @@ contract DemurrageTokenSingleNocap {
decimals = _decimals;
// Demurrage setup
periodStart = block.timestamp;
demurrageTimestamp = block.timestamp;
periodStart = demurrageTimestamp;
periodDuration = _periodMinutes * 60;
demurrageAmount = uint128(ppmDivider * 1000000); // Represents 38 decimal places
demurragePeriod = 1;
//demurrageAmount = 100000000000000000000000000000000000000 - _taxLevelMinute; // Represents 38 decimal places, same as resolutionFactor
demurrageAmount = 100000000000000000000000000000000000000;
//demurragePeriod = 1;
taxLevel = _taxLevelMinute; // Represents 38 decimal places
bytes32 initialRedistribution = toRedistribution(0, 1000000, 0, 1);
bytes32 initialRedistribution = toRedistribution(0, demurrageAmount, 0, 1);
redistributions.push(initialRedistribution);
// Misc settings
@ -135,11 +149,12 @@ contract DemurrageTokenSingleNocap {
baseBalance = baseBalanceOf(_account);
periodCount = actualPeriod() - demurragePeriod;
//periodCount = actualPeriod() - demurragePeriod;
periodCount = getMinutesDelta(demurrageTimestamp);
currentDemurragedAmount = uint128(decayBy(demurrageAmount, periodCount));
return (baseBalance * currentDemurragedAmount) / (ppmDivider * 1000000);
return (baseBalance * currentDemurragedAmount) / (nanoDivider * 1000000000000);
}
/// Balance unmodified by demurrage
@ -187,10 +202,10 @@ contract DemurrageTokenSingleNocap {
function mintTo(address _beneficiary, uint256 _amount) external returns (bool) {
uint256 baseAmount;
require(minter[msg.sender]);
require(minter[msg.sender], 'ERR_ACCESS');
changePeriod();
baseAmount = _amount;
baseAmount = toBaseAmount(_amount);
totalSupply += _amount;
increaseBaseBalance(_beneficiary, baseAmount);
emit Mint(msg.sender, _beneficiary, _amount);
@ -200,7 +215,7 @@ contract DemurrageTokenSingleNocap {
// Deserializes the redistribution word
// uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
function toRedistribution(uint256 _participants, uint256 _demurrageModifierPpm, uint256 _value, uint256 _period) private pure returns(bytes32) {
function toRedistribution(uint256 _participants, uint256 _demurrageModifierPpm, uint256 _value, uint256 _period) public pure returns(bytes32) {
bytes32 redistribution;
redistribution |= bytes32((_demurrageModifierPpm << shiftRedistributionDemurrage) & maskRedistributionDemurrage);
@ -232,10 +247,13 @@ contract DemurrageTokenSingleNocap {
// Save the current total supply amount to the current redistribution period
function saveRedistributionSupply() private returns (bool) {
uint256 currentRedistribution;
uint256 grownSupply;
//grownSupply = growBy(totalSupply, 1);
grownSupply = totalSupply;
currentRedistribution = uint256(redistributions[redistributions.length-1]);
currentRedistribution &= (~maskRedistributionValue);
currentRedistribution |= (totalSupply << shiftRedistributionValue);
currentRedistribution |= (grownSupply << shiftRedistributionValue);
redistributions[redistributions.length-1] = bytes32(currentRedistribution);
return true;
@ -259,35 +277,54 @@ contract DemurrageTokenSingleNocap {
return lastRedistribution;
}
// Returns the amount sent to the sink address
function applyDefaultRedistribution(bytes32 _redistribution) private returns (uint256) {
function getDistribution(uint256 _supply, uint256 _demurrageAmount) public view returns (uint256) {
uint256 difference;
difference = _supply * (resolutionFactor - _demurrageAmount); //(nanoDivider - ((resolutionFactor - _demurrageAmount) / nanoDivider));
return difference / resolutionFactor;
}
function getDistributionFromRedistribution(bytes32 _redistribution) public returns (uint256) {
uint256 redistributionSupply;
uint256 unit;
uint256 redistributionDemurrage;
redistributionSupply = toRedistributionSupply(_redistribution);
redistributionDemurrage = toRedistributionDemurrageModifier(_redistribution);
return getDistribution(redistributionSupply, redistributionDemurrage);
}
unit = (redistributionSupply * taxLevel) / 1000000;
// Returns the amount sent to the sink address
function applyDefaultRedistribution(bytes32 _redistribution) private returns (uint256) {
uint256 unit;
increaseBaseBalance(sinkAddress, unit / ppmDivider);
unit = getDistributionFromRedistribution(_redistribution);
increaseBaseBalance(sinkAddress, toBaseAmount(unit));
return unit;
}
// Calculate the time delta in whole minutes passed between given timestamp and current timestamp
function getMinutesDelta(uint256 _lastTimestamp) public view returns (uint256) {
return (block.timestamp - _lastTimestamp) / 60;
}
// Calculate and cache the demurrage value corresponding to the (period of the) time of the method call
function applyDemurrage() public returns (bool) {
uint128 epochPeriodCount;
uint128 periodCount;
//uint128 epochPeriodCount;
uint256 periodCount;
uint256 lastDemurrageAmount;
uint256 newDemurrageAmount;
epochPeriodCount = actualPeriod();
periodCount = epochPeriodCount - demurragePeriod;
//epochPeriodCount = actualPeriod();
//periodCount = epochPeriodCount - demurragePeriod;
periodCount = getMinutesDelta(demurrageTimestamp);
if (periodCount == 0) {
return false;
}
lastDemurrageAmount = demurrageAmount;
demurrageAmount = uint128(decayBy(lastDemurrageAmount, periodCount));
demurragePeriod = epochPeriodCount;
emit Decayed(epochPeriodCount, periodCount, lastDemurrageAmount, demurrageAmount);
//demurragePeriod = epochPeriodCount;
demurrageTimestamp = demurrageTimestamp + (periodCount * 60);
emit Decayed(demurrageTimestamp, periodCount, lastDemurrageAmount, demurrageAmount);
return true;
}
@ -312,6 +349,7 @@ contract DemurrageTokenSingleNocap {
uint256 periodTimestamp;
uint256 nextPeriod;
applyDemurrage();
currentRedistribution = checkPeriod();
if (currentRedistribution == bytes32(0x00)) {
return false;
@ -321,20 +359,19 @@ contract DemurrageTokenSingleNocap {
nextPeriod = currentPeriod + 1;
periodTimestamp = getPeriodTimeDelta(currentPeriod);
applyDemurrage();
currentDemurrageAmount = demurrageAmount;
demurrageCounts = demurrageCycles(periodTimestamp);
if (demurrageCounts > 0) {
nextRedistributionDemurrage = growBy(currentDemurrageAmount, demurrageCounts) / ppmDivider;
nextRedistributionDemurrage = growBy(currentDemurrageAmount, demurrageCounts);
} else {
nextRedistributionDemurrage = currentDemurrageAmount / ppmDivider;
nextRedistributionDemurrage = currentDemurrageAmount;
}
nextRedistribution = toRedistribution(0, nextRedistributionDemurrage, totalSupply, nextPeriod);
redistributions.push(nextRedistribution);
applyDefaultRedistribution(currentRedistribution);
applyDefaultRedistribution(nextRedistribution);
emit Period(nextPeriod);
return true;
}
@ -344,33 +381,32 @@ contract DemurrageTokenSingleNocap {
uint256 valueFactor;
uint256 truncatedTaxLevel;
valueFactor = 1000000;
truncatedTaxLevel = taxLevel / ppmDivider;
valueFactor = growthResolutionFactor;
truncatedTaxLevel = taxLevel / nanoDivider;
for (uint256 i = 0; i < _period; i++) {
valueFactor = valueFactor + ((valueFactor * truncatedTaxLevel) / 1000000);
valueFactor = valueFactor + ((valueFactor * truncatedTaxLevel) / growthResolutionFactor);
}
return (valueFactor * _value) / 1000000;
return (valueFactor * _value) / growthResolutionFactor;
}
// Calculate a value reduced by demurrage by the given period
// TODO: higher precision if possible
function decayBy(uint256 _value, uint256 _period) public view returns (uint256) {
uint256 valueFactor;
uint256 truncatedTaxLevel;
valueFactor = 1000000;
truncatedTaxLevel = taxLevel / ppmDivider;
valueFactor = growthResolutionFactor;
truncatedTaxLevel = taxLevel / nanoDivider;
for (uint256 i = 0; i < _period; i++) {
valueFactor = valueFactor - ((valueFactor * truncatedTaxLevel) / 1000000);
valueFactor = valueFactor - ((valueFactor * truncatedTaxLevel) / growthResolutionFactor);
}
return (valueFactor * _value) / 1000000;
return (valueFactor * _value) / growthResolutionFactor;
}
// Inflates the given amount according to the current demurrage modifier
function toBaseAmount(uint256 _value) public view returns (uint256) {
return (_value * ppmDivider * 1000000) / demurrageAmount;
return (_value * resolutionFactor) / demurrageAmount;
}
// Implements ERC20, triggers tax and/or redistribution
@ -398,7 +434,6 @@ contract DemurrageTokenSingleNocap {
return result;
}
// Implements ERC20, triggers tax and/or redistribution
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
uint256 baseValue;
@ -421,7 +456,7 @@ contract DemurrageTokenSingleNocap {
decreaseBaseBalance(_from, _value);
increaseBaseBalance(_to, _value);
period = actualPeriod();
//period = actualPeriod();
return true;
}