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Latest 25 from a total of 29 transactions
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Enable Depositin... | 19205044 | 143 days ago | IN | 0 ETH | 0.00073697 | ||||
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Enable Depositin... | 18378704 | 258 days ago | IN | 0 ETH | 0.00047469 | ||||
Enable Depositin... | 18378697 | 258 days ago | IN | 0 ETH | 0.00045507 | ||||
Set Network Fee ... | 18335085 | 265 days ago | IN | 0 ETH | 0.00029715 | ||||
Enable Depositin... | 18269186 | 274 days ago | IN | 0 ETH | 0.00036382 | ||||
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Enable Depositin... | 18269151 | 274 days ago | IN | 0 ETH | 0.00033024 | ||||
Enable Depositin... | 18269147 | 274 days ago | IN | 0 ETH | 0.00035793 | ||||
Enable Depositin... | 18269139 | 274 days ago | IN | 0 ETH | 0.00038817 |
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Contract Name:
PoolCollection
Compiler Version
v0.8.13+commit.abaa5c0e
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { EnumerableSet } from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol"; import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import { Math } from "@openzeppelin/contracts/utils/math/Math.sol"; import { SafeCast } from "@openzeppelin/contracts/utils/math/SafeCast.sol"; import { Token } from "../token/Token.sol"; import { TokenLibrary } from "../token/TokenLibrary.sol"; import { IMasterVault } from "../vaults/interfaces/IMasterVault.sol"; import { IExternalProtectionVault } from "../vaults/interfaces/IExternalProtectionVault.sol"; import { IVersioned } from "../utility/interfaces/IVersioned.sol"; import { PPM_RESOLUTION } from "../utility/Constants.sol"; import { Owned } from "../utility/Owned.sol"; import { BlockNumber } from "../utility/BlockNumber.sol"; import { Fraction, Fraction112, FractionLibrary, zeroFraction112 } from "../utility/FractionLibrary.sol"; import { Sint256, MathEx } from "../utility/MathEx.sol"; // prettier-ignore import { Utils, AlreadyExists, DoesNotExist, InvalidParam, InvalidStakedBalance } from "../utility/Utils.sol"; import { INetworkSettings, NotWhitelisted } from "../network/interfaces/INetworkSettings.sol"; import { IBancorNetwork } from "../network/interfaces/IBancorNetwork.sol"; import { IPoolToken } from "./interfaces/IPoolToken.sol"; import { IPoolTokenFactory } from "./interfaces/IPoolTokenFactory.sol"; import { IPoolMigrator } from "./interfaces/IPoolMigrator.sol"; // prettier-ignore import { AverageRates, IPoolCollection, PoolLiquidity, Pool, TRADING_STATUS_UPDATE_DEFAULT, TRADING_STATUS_UPDATE_ADMIN, TRADING_STATUS_UPDATE_MIN_LIQUIDITY, TRADING_STATUS_UPDATE_INVALID_STATE, TRADING_STATUS_UPDATE_NETWORK_DISABLE, TradeAmountAndFee, WithdrawalAmounts } from "./interfaces/IPoolCollection.sol"; import { IBNTPool } from "./interfaces/IBNTPool.sol"; import { PoolCollectionWithdrawal } from "./PoolCollectionWithdrawal.sol"; // base token withdrawal output amounts struct InternalWithdrawalAmounts { uint256 baseTokensToTransferFromMasterVault; // base token amount to transfer from the master vault to the provider uint256 bntToMintForProvider; // BNT amount to mint directly for the provider uint256 baseTokensToTransferFromEPV; // base token amount to transfer from the external protection vault to the provider Sint256 baseTokensTradingLiquidityDelta; // base token amount to add to the trading liquidity Sint256 bntTradingLiquidityDelta; // BNT amount to add to the trading liquidity and to the master vault Sint256 bntProtocolHoldingsDelta; // BNT amount add to the protocol equity uint256 baseTokensWithdrawalFee; // base token amount to keep in the pool as a withdrawal fee uint256 baseTokensWithdrawalAmount; // base token amount equivalent to the base pool token's withdrawal amount uint256 poolTokenAmount; // base pool token uint256 poolTokenTotalSupply; // base pool token's total supply uint256 newBaseTokenTradingLiquidity; // new base token trading liquidity uint256 newBNTTradingLiquidity; // new BNT trading liquidity } struct TargetTradingLiquidity { bool update; uint256 bnt; uint256 baseToken; } enum PoolRateState { Uninitialized, Unstable, Stable } /** * @dev Pool Collection contract * * notes: * * - the address of reserve token serves as the pool unique ID in both contract functions and events */ contract PoolCollection is IPoolCollection, Owned, BlockNumber, Utils { using TokenLibrary for Token; using FractionLibrary for Fraction; using FractionLibrary for Fraction112; using EnumerableSet for EnumerableSet.AddressSet; using SafeCast for uint256; error AlreadyEnabled(); error DepositingDisabled(); error InsufficientLiquidity(); error InsufficientSourceAmount(); error InsufficientTargetAmount(); error InvalidRate(); error RateUnstable(); error TradingDisabled(); error FundingLimitTooHigh(); uint16 private constant POOL_TYPE = 1; uint256 private constant LIQUIDITY_GROWTH_FACTOR = 2; uint256 private constant BOOTSTRAPPING_LIQUIDITY_BUFFER_FACTOR = 2; uint32 private constant DEFAULT_TRADING_FEE_PPM = 2_000; // 0.2% uint32 private constant DEFAULT_NETWORK_FEE_PPM = 200_000; // 20% uint32 private constant RATE_MAX_DEVIATION_PPM = 10_000; // %1 uint32 private constant RATE_RESET_BLOCK_THRESHOLD = 100; // the average rate is recalculated based on the ratio between the weights of the rates the smaller the weights are, // the larger the supported range of each one of the rates is uint256 private constant EMA_AVERAGE_RATE_WEIGHT = 4; uint256 private constant EMA_SPOT_RATE_WEIGHT = 1; struct TradeIntermediateResult { uint256 sourceAmount; uint256 targetAmount; uint256 limit; uint256 tradingFeeAmount; uint256 networkFeeAmount; uint256 sourceBalance; uint256 targetBalance; uint256 stakedBalance; Token pool; bool isSourceBNT; bool bySourceAmount; uint32 tradingFeePPM; bytes32 contextId; } struct TradeAmountAndTradingFee { uint256 amount; uint256 tradingFeeAmount; } // the network contract IBancorNetwork private immutable _network; // the address of the BNT token IERC20 private immutable _bnt; // the network settings contract INetworkSettings private immutable _networkSettings; // the master vault contract IMasterVault private immutable _masterVault; // the BNT pool contract IBNTPool internal immutable _bntPool; // the address of the external protection vault IExternalProtectionVault private immutable _externalProtectionVault; // the pool token factory contract IPoolTokenFactory private immutable _poolTokenFactory; // the pool migrator contract IPoolMigrator private immutable _poolMigrator; // a mapping between tokens and their pools mapping(Token => Pool) internal _poolData; // the set of all pools which are managed by this pool collection EnumerableSet.AddressSet private _pools; // the default trading fee (in units of PPM) uint32 private _defaultTradingFeePPM; // the global network fee (in units of PPM) uint32 private _networkFeePPM; /** * @dev triggered when the default trading fee is updated */ event DefaultTradingFeePPMUpdated(uint32 prevFeePPM, uint32 newFeePPM); /** * @dev triggered when the network fee is updated */ event NetworkFeePPMUpdated(uint32 prevFeePPM, uint32 newFeePPM); /** * @dev triggered when a specific pool's trading fee is updated */ event TradingFeePPMUpdated(Token indexed pool, uint32 prevFeePPM, uint32 newFeePPM); /** * @dev triggered when trading in a specific pool is enabled/disabled */ event TradingEnabled(Token indexed pool, bool indexed newStatus, uint8 indexed reason); /** * @dev triggered when depositing into a specific pool is enabled/disabled */ event DepositingEnabled(Token indexed pool, bool indexed newStatus); /** * @dev triggered when new liquidity is deposited into a pool */ event TokensDeposited( bytes32 indexed contextId, address indexed provider, Token indexed token, uint256 baseTokenAmount, uint256 poolTokenAmount ); /** * @dev triggered when existing liquidity is withdrawn from a pool */ event TokensWithdrawn( bytes32 indexed contextId, address indexed provider, Token indexed token, uint256 baseTokenAmount, uint256 poolTokenAmount, uint256 externalProtectionBaseTokenAmount, uint256 bntAmount, uint256 withdrawalFeeAmount ); /** * @dev triggered when the trading liquidity in a pool is updated */ event TradingLiquidityUpdated( bytes32 indexed contextId, Token indexed pool, Token indexed token, uint256 prevLiquidity, uint256 newLiquidity ); /** * @dev triggered when the total liquidity in a pool is updated */ event TotalLiquidityUpdated( bytes32 indexed contextId, Token indexed pool, uint256 liquidity, uint256 stakedBalance, uint256 poolTokenSupply ); /** * @dev initializes a new PoolCollection contract */ constructor( IBancorNetwork initNetwork, IERC20 initBNT, INetworkSettings initNetworkSettings, IMasterVault initMasterVault, IBNTPool initBNTPool, IExternalProtectionVault initExternalProtectionVault, IPoolTokenFactory initPoolTokenFactory, IPoolMigrator initPoolMigrator ) { _validAddress(address(initNetwork)); _validAddress(address(initBNT)); _validAddress(address(initNetworkSettings)); _validAddress(address(initMasterVault)); _validAddress(address(initBNTPool)); _validAddress(address(initExternalProtectionVault)); _validAddress(address(initPoolTokenFactory)); _validAddress(address(initPoolMigrator)); _network = initNetwork; _bnt = initBNT; _networkSettings = initNetworkSettings; _masterVault = initMasterVault; _bntPool = initBNTPool; _externalProtectionVault = initExternalProtectionVault; _poolTokenFactory = initPoolTokenFactory; _poolMigrator = initPoolMigrator; _setDefaultTradingFeePPM(DEFAULT_TRADING_FEE_PPM); _setNetworkFeePPM(DEFAULT_NETWORK_FEE_PPM); } /** * @inheritdoc IVersioned */ function version() external view virtual returns (uint16) { return 12; } /** * @inheritdoc IPoolCollection */ function poolType() external view virtual returns (uint16) { return POOL_TYPE; } /** * @inheritdoc IPoolCollection */ function defaultTradingFeePPM() external view returns (uint32) { return _defaultTradingFeePPM; } /** * @inheritdoc IPoolCollection */ function networkFeePPM() external view returns (uint32) { return _networkFeePPM; } /** * @inheritdoc IPoolCollection */ function pools() external view returns (Token[] memory) { uint256 length = _pools.length(); Token[] memory list = new Token[](length); for (uint256 i = 0; i < length; i++) { list[i] = Token(_pools.at(i)); } return list; } /** * @inheritdoc IPoolCollection */ function poolCount() external view returns (uint256) { return _pools.length(); } /** * @dev sets the default trading fee (in units of PPM) * * requirements: * * - the caller must be the owner of the contract */ function setDefaultTradingFeePPM( uint32 newDefaultTradingFeePPM ) external onlyOwner validFee(newDefaultTradingFeePPM) { _setDefaultTradingFeePPM(newDefaultTradingFeePPM); } /** * @dev sets the network fee (in units of PPM) * * requirements: * * - the caller must be the owner of the contract */ function setNetworkFeePPM(uint32 newNetworkFeePPM) external onlyOwner validFee(newNetworkFeePPM) { _setNetworkFeePPM(newNetworkFeePPM); } /** * @inheritdoc IPoolCollection */ function createPool(Token token) external only(address(_network)) { if (!_networkSettings.isTokenWhitelisted(token)) { revert NotWhitelisted(); } IPoolToken newPoolToken = IPoolToken(_poolTokenFactory.createPoolToken(token)); newPoolToken.acceptOwnership(); Pool memory newPool = Pool({ poolToken: newPoolToken, tradingFeePPM: _defaultTradingFeePPM, tradingEnabled: false, depositingEnabled: true, averageRates: AverageRates({ blockNumber: 0, rate: zeroFraction112(), invRate: zeroFraction112() }), liquidity: PoolLiquidity({ bntTradingLiquidity: 0, baseTokenTradingLiquidity: 0, stakedBalance: 0 }) }); _addPool(token, newPool); emit TradingEnabled({ pool: token, newStatus: newPool.tradingEnabled, reason: TRADING_STATUS_UPDATE_DEFAULT }); emit TradingFeePPMUpdated({ pool: token, prevFeePPM: 0, newFeePPM: newPool.tradingFeePPM }); emit DepositingEnabled({ pool: token, newStatus: newPool.depositingEnabled }); } /** * @inheritdoc IPoolCollection */ function isPoolValid(Token pool) external view returns (bool) { return address(_poolData[pool].poolToken) != address(0); } /** * @dev returns specific pool's data * * notes: * * - there is no guarantee that this function will remain forward compatible, * so relying on it should be avoided and instead, rely on specific getters * from the IPoolCollection interface */ function poolData(Token pool) external view returns (Pool memory) { return _poolData[pool]; } /** * @inheritdoc IPoolCollection */ function poolLiquidity(Token pool) external view returns (PoolLiquidity memory) { return _poolData[pool].liquidity; } /** * @inheritdoc IPoolCollection */ function poolToken(Token pool) external view returns (IPoolToken) { return _poolData[pool].poolToken; } /** * @inheritdoc IPoolCollection */ function tradingFeePPM(Token pool) external view returns (uint32) { return _poolData[pool].tradingFeePPM; } /** * @inheritdoc IPoolCollection */ function tradingEnabled(Token pool) external view returns (bool) { return _poolData[pool].tradingEnabled; } /** * @inheritdoc IPoolCollection */ function depositingEnabled(Token pool) external view returns (bool) { return _poolData[pool].depositingEnabled; } /** * @inheritdoc IPoolCollection */ function poolTokenToUnderlying(Token pool, uint256 poolTokenAmount) external view returns (uint256) { Pool storage data = _poolData[pool]; return _poolTokenToUnderlying(poolTokenAmount, data.poolToken.totalSupply(), data.liquidity.stakedBalance); } /** * @inheritdoc IPoolCollection */ function underlyingToPoolToken(Token pool, uint256 baseTokenAmount) external view returns (uint256) { Pool storage data = _poolData[pool]; return _underlyingToPoolToken(baseTokenAmount, data.poolToken.totalSupply(), data.liquidity.stakedBalance); } /** * @inheritdoc IPoolCollection */ function poolTokenAmountToBurn( Token pool, uint256 baseTokenAmountToDistribute, uint256 protocolPoolTokenAmount ) external view returns (uint256) { if (baseTokenAmountToDistribute == 0) { return 0; } Pool storage data = _poolData[pool]; uint256 poolTokenSupply = data.poolToken.totalSupply(); uint256 val = baseTokenAmountToDistribute * poolTokenSupply; return MathEx.mulDivF( val, poolTokenSupply, val + data.liquidity.stakedBalance * (poolTokenSupply - protocolPoolTokenAmount) ); } /** * @inheritdoc IPoolCollection */ function isPoolStable(Token pool) external view returns (bool) { Pool storage data = _poolData[pool]; return _poolRateState(data) == PoolRateState.Stable; } /** * @dev sets the trading fee of a given pool * * requirements: * * - the caller must be the owner of the contract */ function setTradingFeePPM(Token pool, uint32 newTradingFeePPM) external onlyOwner validFee(newTradingFeePPM) { Pool storage data = _poolStorage(pool); uint32 prevTradingFeePPM = data.tradingFeePPM; if (prevTradingFeePPM == newTradingFeePPM) { return; } data.tradingFeePPM = newTradingFeePPM; emit TradingFeePPMUpdated({ pool: pool, prevFeePPM: prevTradingFeePPM, newFeePPM: newTradingFeePPM }); } /** * @dev enables trading in a given pool, by providing the funding rate as two virtual balances, and updates its * trading liquidity * * note that the virtual balances should be derived from token prices, normalized to the smallest unit of * tokens. In other words, the ratio between BNT and TKN virtual balances should be the ratio between the $ value * of 1 wei of TKN and 1 wei of BNT, taking both of their decimals into account. For example: * * - if the price of one (10**18 wei) BNT is $X and the price of one (10**18 wei) TKN is $Y, then the virtual balances * should represent a ratio of X to Y * - if the price of one (10**18 wei) BNT is $X and the price of one (10**6 wei) USDC is $Y, then the virtual balances * should represent a ratio of X to Y*10**12 * * requirements: * * - the caller must be the owner of the contract */ function enableTrading(Token pool, uint256 bntVirtualBalance, uint256 baseTokenVirtualBalance) external onlyOwner { Fraction memory fundingRate = Fraction({ n: bntVirtualBalance, d: baseTokenVirtualBalance }); _validRate(fundingRate); Pool storage data = _poolStorage(pool); if (data.tradingEnabled) { revert AlreadyEnabled(); } // adjust the trading liquidity based on the base token vault balance and funding limits bytes32 contextId = keccak256(abi.encodePacked(msg.sender, pool, bntVirtualBalance, baseTokenVirtualBalance)); uint256 minLiquidityForTrading = _networkSettings.minLiquidityForTrading(); _updateTradingLiquidity(contextId, pool, data, fundingRate, minLiquidityForTrading); // verify that the BNT trading liquidity is equal or greater than the minimum liquidity for trading if (data.liquidity.bntTradingLiquidity < minLiquidityForTrading) { revert InsufficientLiquidity(); } Fraction112 memory fundingRate112 = fundingRate.toFraction112(); data.averageRates = AverageRates({ blockNumber: _blockNumber(), rate: fundingRate112, invRate: fundingRate112.inverse() }); data.tradingEnabled = true; emit TradingEnabled({ pool: pool, newStatus: true, reason: TRADING_STATUS_UPDATE_ADMIN }); } /** * @dev disables trading in a given pool * * requirements: * * - the caller must be the owner of the contract */ function disableTrading(Token pool) external onlyOwner { Pool storage data = _poolStorage(pool); _resetTradingLiquidity(bytes32(0), pool, data, data.liquidity, TRADING_STATUS_UPDATE_ADMIN); } /** * @inheritdoc IPoolCollection */ function disableTradingByNetwork(Token pool) external only(address(_network)) { Pool storage data = _poolStorage(pool); _resetTradingLiquidity(bytes32(0), pool, data, data.liquidity, TRADING_STATUS_UPDATE_NETWORK_DISABLE); } /** * @dev adjusts the trading liquidity in the given pool based on the base token * vault balance/funding limit * * requirements: * * - the caller must be the owner of the contract */ function updateTradingLiquidity(Token pool) external onlyOwner { Pool storage data = _poolStorage(pool); PoolLiquidity memory liquidity = data.liquidity; bytes32 contextId = keccak256( abi.encodePacked(msg.sender, pool, liquidity.bntTradingLiquidity, liquidity.baseTokenTradingLiquidity) ); AverageRates memory effectiveAverageRates = _effectiveAverageRates( data.averageRates, Fraction({ n: liquidity.bntTradingLiquidity, d: liquidity.baseTokenTradingLiquidity }) ); uint256 minLiquidityForTrading = _networkSettings.minLiquidityForTrading(); _updateTradingLiquidity( contextId, pool, data, effectiveAverageRates.rate.fromFraction112(), minLiquidityForTrading ); } /** * @dev enables/disables depositing into a given pool * * requirements: * * - the caller must be the owner of the contract */ function enableDepositing(Token pool, bool status) external onlyOwner { Pool storage data = _poolStorage(pool); if (data.depositingEnabled == status) { return; } data.depositingEnabled = status; emit DepositingEnabled({ pool: pool, newStatus: status }); } /** * @inheritdoc IPoolCollection */ function depositFor( bytes32 contextId, address provider, Token pool, uint256 baseTokenAmount ) external only(address(_network)) validAddress(provider) greaterThanZero(baseTokenAmount) returns (uint256) { Pool storage data = _poolStorage(pool); if (!data.depositingEnabled) { revert DepositingDisabled(); } // if there are no pool tokens available to support the staked balance - reset the // trading liquidity and the staked balance // in addition, get the effective average rates uint256 prevPoolTokenTotalSupply = data.poolToken.totalSupply(); uint256 currentStakedBalance = data.liquidity.stakedBalance; AverageRates memory effectiveAverageRates; if (prevPoolTokenTotalSupply == 0 && currentStakedBalance != 0) { currentStakedBalance = 0; PoolLiquidity memory prevLiquidity = data.liquidity; _resetTradingLiquidity(contextId, pool, data, prevLiquidity, TRADING_STATUS_UPDATE_INVALID_STATE); effectiveAverageRates = AverageRates({ blockNumber: 0, rate: zeroFraction112(), invRate: zeroFraction112() }); } else { PoolLiquidity memory prevLiquidity = data.liquidity; effectiveAverageRates = _effectiveAverageRates( data.averageRates, Fraction({ n: prevLiquidity.bntTradingLiquidity, d: prevLiquidity.baseTokenTradingLiquidity }) ); } // calculate the pool token amount to mint uint256 poolTokenAmount = _underlyingToPoolToken( baseTokenAmount, prevPoolTokenTotalSupply, currentStakedBalance ); // update the staked balance with the full base token amount data.liquidity.stakedBalance = currentStakedBalance + baseTokenAmount; // mint pool tokens to the provider data.poolToken.mint(provider, poolTokenAmount); // should be triggered before the trading liquidity is updated emit TokensDeposited({ contextId: contextId, provider: provider, token: pool, baseTokenAmount: baseTokenAmount, poolTokenAmount: poolTokenAmount }); emit TotalLiquidityUpdated({ contextId: contextId, pool: pool, liquidity: pool.balanceOf(address(_masterVault)), stakedBalance: data.liquidity.stakedBalance, poolTokenSupply: prevPoolTokenTotalSupply + poolTokenAmount }); // adjust the trading liquidity based on the base token vault balance and funding limits _updateTradingLiquidity( contextId, pool, data, effectiveAverageRates.rate.fromFraction112(), _networkSettings.minLiquidityForTrading() ); // if trading is enabled, then update the recent average rates if (data.tradingEnabled) { PoolLiquidity memory liquidity = data.liquidity; _updateAverageRates( data, Fraction({ n: liquidity.bntTradingLiquidity, d: liquidity.baseTokenTradingLiquidity }) ); } return poolTokenAmount; } /** * @inheritdoc IPoolCollection */ function withdraw( bytes32 contextId, address provider, Token pool, uint256 poolTokenAmount, uint256 baseTokenAmount ) external only(address(_network)) validAddress(provider) greaterThanZero(poolTokenAmount) greaterThanZero(baseTokenAmount) returns (uint256) { Pool storage data = _poolStorage(pool); PoolLiquidity memory liquidity = data.liquidity; uint256 poolTokenTotalSupply = data.poolToken.totalSupply(); uint256 underlyingAmount = _poolTokenToUnderlying( poolTokenAmount, poolTokenTotalSupply, liquidity.stakedBalance ); if (baseTokenAmount > underlyingAmount) { revert InvalidParam(); } if (_poolRateState(data) == PoolRateState.Unstable) { revert RateUnstable(); } // obtain the withdrawal amounts InternalWithdrawalAmounts memory amounts = _poolWithdrawalAmounts( pool, poolTokenAmount, baseTokenAmount, liquidity, data.tradingFeePPM, poolTokenTotalSupply ); // execute the actual withdrawal _executeWithdrawal(contextId, provider, pool, data, amounts); // if trading is enabled, then update the recent average rates if (data.tradingEnabled) { _updateAverageRates( data, Fraction({ n: data.liquidity.bntTradingLiquidity, d: data.liquidity.baseTokenTradingLiquidity }) ); } return amounts.baseTokensToTransferFromMasterVault; } /** * @inheritdoc IPoolCollection */ function withdrawalAmounts( Token pool, uint256 poolTokenAmount ) external view validAddress(address(pool)) greaterThanZero(poolTokenAmount) returns (WithdrawalAmounts memory) { Pool storage data = _poolData[pool]; PoolLiquidity memory liquidity = data.liquidity; uint256 poolTokenTotalSupply = data.poolToken.totalSupply(); uint256 underlyingAmount = _poolTokenToUnderlying( poolTokenAmount, poolTokenTotalSupply, liquidity.stakedBalance ); InternalWithdrawalAmounts memory amounts = _poolWithdrawalAmounts( pool, poolTokenAmount, underlyingAmount, liquidity, data.tradingFeePPM, poolTokenTotalSupply ); return WithdrawalAmounts({ totalAmount: amounts.baseTokensWithdrawalAmount - amounts.baseTokensWithdrawalFee, baseTokenAmount: amounts.baseTokensToTransferFromMasterVault + amounts.baseTokensToTransferFromEPV, bntAmount: 0 }); } /** * @inheritdoc IPoolCollection */ function tradeBySourceAmount( bytes32 contextId, Token sourceToken, Token targetToken, uint256 sourceAmount, uint256 minReturnAmount, bool ignoreFees ) external only(address(_network)) greaterThanZero(sourceAmount) greaterThanZero(minReturnAmount) returns (TradeAmountAndFee memory) { TradeIntermediateResult memory result = _initTrade( contextId, sourceToken, targetToken, sourceAmount, minReturnAmount, true ); if (ignoreFees) { result.tradingFeePPM = 0; } _performTrade(result); return TradeAmountAndFee({ amount: result.targetAmount, tradingFeeAmount: result.tradingFeeAmount, networkFeeAmount: result.networkFeeAmount }); } /** * @inheritdoc IPoolCollection */ function tradeByTargetAmount( bytes32 contextId, Token sourceToken, Token targetToken, uint256 targetAmount, uint256 maxSourceAmount, bool ignoreFees ) external only(address(_network)) greaterThanZero(targetAmount) greaterThanZero(maxSourceAmount) returns (TradeAmountAndFee memory) { TradeIntermediateResult memory result = _initTrade( contextId, sourceToken, targetToken, targetAmount, maxSourceAmount, false ); if (ignoreFees) { result.tradingFeePPM = 0; } _performTrade(result); return TradeAmountAndFee({ amount: result.sourceAmount, tradingFeeAmount: result.tradingFeeAmount, networkFeeAmount: result.networkFeeAmount }); } /** * @inheritdoc IPoolCollection */ function tradeOutputAndFeeBySourceAmount( Token sourceToken, Token targetToken, uint256 sourceAmount ) external view greaterThanZero(sourceAmount) returns (TradeAmountAndFee memory) { TradeIntermediateResult memory result = _initTrade(bytes32(0), sourceToken, targetToken, sourceAmount, 1, true); _processTrade(result); return TradeAmountAndFee({ amount: result.targetAmount, tradingFeeAmount: result.tradingFeeAmount, networkFeeAmount: result.networkFeeAmount }); } /** * @inheritdoc IPoolCollection */ function tradeInputAndFeeByTargetAmount( Token sourceToken, Token targetToken, uint256 targetAmount ) external view greaterThanZero(targetAmount) returns (TradeAmountAndFee memory) { TradeIntermediateResult memory result = _initTrade( bytes32(0), sourceToken, targetToken, targetAmount, type(uint256).max, false ); _processTrade(result); return TradeAmountAndFee({ amount: result.sourceAmount, tradingFeeAmount: result.tradingFeeAmount, networkFeeAmount: result.networkFeeAmount }); } /** * @inheritdoc IPoolCollection */ function onFeesCollected(Token pool, uint256 feeAmount) external only(address(_network)) { if (feeAmount == 0) { return; } Pool storage data = _poolStorage(pool); // increase the staked balance by the given amount data.liquidity.stakedBalance += feeAmount; } /** * @inheritdoc IPoolCollection */ function migratePoolIn( Token pool, Pool calldata data ) external validAddress(address(pool)) only(address(_poolMigrator)) { _addPool(pool, data); data.poolToken.acceptOwnership(); } /** * @inheritdoc IPoolCollection */ function migratePoolOut( Token pool, IPoolCollection targetPoolCollection ) external validAddress(address(targetPoolCollection)) only(address(_poolMigrator)) { IPoolToken cachedPoolToken = _poolData[pool].poolToken; _removePool(pool); cachedPoolToken.transferOwnership(address(targetPoolCollection)); } /** * @dev adds a pool */ function _addPool(Token pool, Pool memory data) private { if (!_pools.add(address(pool))) { revert AlreadyExists(); } _poolData[pool] = data; } /** * @dev removes a pool */ function _removePool(Token pool) private { if (!_pools.remove(address(pool))) { revert DoesNotExist(); } delete _poolData[pool]; } /** * @dev returns withdrawal amounts */ function _poolWithdrawalAmounts( Token pool, uint256 poolTokenAmount, uint256 baseTokensWithdrawalAmount, PoolLiquidity memory liquidity, uint32 poolTradingFeePPM, uint256 poolTokenTotalSupply ) internal view returns (InternalWithdrawalAmounts memory) { // the base token trading liquidity of a given pool can never be higher than the base token balance of the vault // whenever the base token trading liquidity is updated, it is set to at most the base token balance of the vault uint256 baseTokenExcessAmount = pool.balanceOf(address(_masterVault)) - liquidity.baseTokenTradingLiquidity; PoolCollectionWithdrawal.Output memory output = PoolCollectionWithdrawal.calculateWithdrawalAmounts( liquidity.bntTradingLiquidity, liquidity.baseTokenTradingLiquidity, baseTokenExcessAmount, liquidity.stakedBalance, pool.balanceOf(address(_externalProtectionVault)), poolTradingFeePPM, _networkSettings.withdrawalFeePPM(), baseTokensWithdrawalAmount ); return InternalWithdrawalAmounts({ baseTokensToTransferFromMasterVault: output.s, bntToMintForProvider: output.t, baseTokensToTransferFromEPV: output.u, baseTokensTradingLiquidityDelta: output.r, bntTradingLiquidityDelta: output.p, bntProtocolHoldingsDelta: output.q, baseTokensWithdrawalFee: output.v, baseTokensWithdrawalAmount: baseTokensWithdrawalAmount, poolTokenAmount: poolTokenAmount, poolTokenTotalSupply: poolTokenTotalSupply, newBaseTokenTradingLiquidity: output.r.isNeg ? liquidity.baseTokenTradingLiquidity - output.r.value : liquidity.baseTokenTradingLiquidity + output.r.value, newBNTTradingLiquidity: output.p.isNeg ? liquidity.bntTradingLiquidity - output.p.value : liquidity.bntTradingLiquidity + output.p.value }); } /** * @dev executes the following actions: * * - burn the network's base pool tokens * - update the pool's base token staked balance * - update the pool's base token trading liquidity * - update the pool's BNT trading liquidity * - update the pool's trading liquidity product * - emit an event if the pool's BNT trading liquidity has crossed the minimum threshold * (either above the threshold or below the threshold) */ function _executeWithdrawal( bytes32 contextId, address provider, Token pool, Pool storage data, InternalWithdrawalAmounts memory amounts ) private { PoolLiquidity storage liquidity = data.liquidity; PoolLiquidity memory prevLiquidity = liquidity; data.poolToken.burn(amounts.poolTokenAmount); uint256 newPoolTokenTotalSupply = amounts.poolTokenTotalSupply - amounts.poolTokenAmount; uint256 newStakedBalance = MathEx.mulDivF( liquidity.stakedBalance, newPoolTokenTotalSupply, amounts.poolTokenTotalSupply ); liquidity.stakedBalance = newStakedBalance; // trading liquidity is assumed to never exceed 128 bits (the cast below will revert otherwise) liquidity.baseTokenTradingLiquidity = amounts.newBaseTokenTradingLiquidity.toUint128(); liquidity.bntTradingLiquidity = amounts.newBNTTradingLiquidity.toUint128(); if (amounts.bntProtocolHoldingsDelta.value > 0) { assert(amounts.bntProtocolHoldingsDelta.isNeg); // currently no support for requesting funding here _bntPool.renounceFunding(contextId, pool, amounts.bntProtocolHoldingsDelta.value); } else if (amounts.bntTradingLiquidityDelta.value > 0) { if (amounts.bntTradingLiquidityDelta.isNeg) { _bntPool.burnFromVault(amounts.bntTradingLiquidityDelta.value); } else { _bntPool.mint(address(_masterVault), amounts.bntTradingLiquidityDelta.value); } } // if the provider should receive some base tokens from the external protection vault - remove the tokens from // the external protection vault and send them to the master vault if (amounts.baseTokensToTransferFromEPV > 0) { _externalProtectionVault.withdrawFunds( pool, payable(address(_masterVault)), amounts.baseTokensToTransferFromEPV ); amounts.baseTokensToTransferFromMasterVault += amounts.baseTokensToTransferFromEPV; } // if the provider should receive some base tokens from the master vault - remove the tokens from the master // vault and send them to the provider if (amounts.baseTokensToTransferFromMasterVault > 0) { _masterVault.withdrawFunds(pool, payable(provider), amounts.baseTokensToTransferFromMasterVault); } // ensure that the average rate is reset when the pool is being emptied if (amounts.newBaseTokenTradingLiquidity == 0) { data.averageRates.rate = zeroFraction112(); data.averageRates.invRate = zeroFraction112(); } // if the new BNT trading liquidity is below the minimum liquidity for trading - reset the liquidity if (amounts.newBNTTradingLiquidity < _networkSettings.minLiquidityForTrading()) { _resetTradingLiquidity( contextId, pool, data, prevLiquidity, amounts.newBNTTradingLiquidity, TRADING_STATUS_UPDATE_MIN_LIQUIDITY ); } else { _dispatchTradingLiquidityEvents(contextId, pool, prevLiquidity, liquidity); } emit TokensWithdrawn({ contextId: contextId, provider: provider, token: pool, baseTokenAmount: amounts.baseTokensToTransferFromMasterVault, poolTokenAmount: amounts.poolTokenAmount, externalProtectionBaseTokenAmount: amounts.baseTokensToTransferFromEPV, bntAmount: 0, withdrawalFeeAmount: amounts.baseTokensWithdrawalFee }); emit TotalLiquidityUpdated({ contextId: contextId, pool: pool, liquidity: pool.balanceOf(address(_masterVault)), stakedBalance: newStakedBalance, poolTokenSupply: newPoolTokenTotalSupply }); } /** * @dev sets the default trading fee (in units of PPM) */ function _setDefaultTradingFeePPM(uint32 newDefaultTradingFeePPM) private { uint32 prevDefaultTradingFeePPM = _defaultTradingFeePPM; if (prevDefaultTradingFeePPM == newDefaultTradingFeePPM) { return; } _defaultTradingFeePPM = newDefaultTradingFeePPM; emit DefaultTradingFeePPMUpdated({ prevFeePPM: prevDefaultTradingFeePPM, newFeePPM: newDefaultTradingFeePPM }); } /** * @dev sets the network fee (in units of PPM) */ function _setNetworkFeePPM(uint32 newNetworkFeePPM) private { uint32 prevNetworkFeePPM = _networkFeePPM; if (prevNetworkFeePPM == newNetworkFeePPM) { return; } _networkFeePPM = newNetworkFeePPM; emit NetworkFeePPMUpdated({ prevFeePPM: prevNetworkFeePPM, newFeePPM: newNetworkFeePPM }); } /** * @dev returns a storage reference to pool data */ function _poolStorage(Token pool) private view returns (Pool storage) { Pool storage data = _poolData[pool]; if (address(data.poolToken) == address(0)) { revert DoesNotExist(); } return data; } /** * @dev calculates base tokens amount */ function _poolTokenToUnderlying( uint256 poolTokenAmount, uint256 poolTokenSupply, uint256 stakedBalance ) private pure returns (uint256) { if (poolTokenSupply == 0) { // if this is the initial liquidity provision - use a one-to-one pool token to base token rate if (stakedBalance > 0) { revert InvalidStakedBalance(); } return poolTokenAmount; } return MathEx.mulDivF(poolTokenAmount, stakedBalance, poolTokenSupply); } /** * @dev calculates pool tokens amount */ function _underlyingToPoolToken( uint256 baseTokenAmount, uint256 poolTokenSupply, uint256 stakedBalance ) private pure returns (uint256) { if (poolTokenSupply == 0) { // if this is the initial liquidity provision - use a one-to-one pool token to base token rate if (stakedBalance > 0) { revert InvalidStakedBalance(); } return baseTokenAmount; } return MathEx.mulDivC(baseTokenAmount, poolTokenSupply, stakedBalance); } /** * @dev calculates the target trading liquidities, taking into account the total out-of-curve base token liquidity, * and the deltas between the new and the previous states */ function _calcTargetTradingLiquidity( uint256 baseTokenTotalLiquidity, uint256 fundingLimit, uint256 currentFunding, PoolLiquidity memory liquidity, Fraction memory fundingRate, uint256 minLiquidityForTrading ) private pure returns (TargetTradingLiquidity memory) { // calculate the target BNT trading liquidity based on the following: // - BNT liquidity required to match the based token unused (off-curve) liquidity // - BNT funding limit // - current BNT funding uint256 targetBNTTradingLiquidity = liquidity.bntTradingLiquidity; if (fundingLimit > currentFunding) { // increase the trading liquidity uint256 availableFunding = fundingLimit - currentFunding; uint256 baseTokenUnusedLiquidity = baseTokenTotalLiquidity - liquidity.baseTokenTradingLiquidity; uint256 targetBNTTradingLiquidityDelta = Math.min( MathEx.mulDivF(baseTokenUnusedLiquidity, fundingRate.n, fundingRate.d), availableFunding ); targetBNTTradingLiquidity = liquidity.bntTradingLiquidity + targetBNTTradingLiquidityDelta; } else if (fundingLimit < currentFunding) { // decrease the trading liquidity uint256 excessFunding = currentFunding - fundingLimit; targetBNTTradingLiquidity = MathEx.subMax0(liquidity.bntTradingLiquidity, excessFunding); } // if the target is equal to the current trading liquidity, no update is needed if (targetBNTTradingLiquidity == liquidity.bntTradingLiquidity) { return TargetTradingLiquidity({ update: false, bnt: 0, baseToken: 0 }); } // ensure that the target is above the minimum liquidity for trading if (targetBNTTradingLiquidity < minLiquidityForTrading) { return TargetTradingLiquidity({ update: true, bnt: 0, baseToken: 0 }); } // calculate the target base token trading liquidity using the following: // - calculate the delta between the current/target BNT trading liquidity // - calculate the base token trading liquidity delta based on the BNT trading liquidity delta and the funding rate // - apply the base token trading liquidity delta to the current base token trading liquidity // // note that the effective funding rate is always the rate between BNT and the base token) uint256 bntTradingLiquidityDelta; uint256 baseTokenTradingLiquidityDelta; // liquidity increase // note that liquidity increase is capped if (targetBNTTradingLiquidity > liquidity.bntTradingLiquidity) { uint256 tradingLiquidityCap; if (liquidity.bntTradingLiquidity == 0) { // the current BNT trading liquidity is 0 - cap the target trading liquidity // by the default bootstrap amount, which includes a buffer to reduce the chance // for trading to be disabled as a result of trades in the pool tradingLiquidityCap = minLiquidityForTrading * BOOTSTRAPPING_LIQUIDITY_BUFFER_FACTOR; } else { // the current BNT trading liquidity is not 0 - cap the target using the growth factor tradingLiquidityCap = liquidity.bntTradingLiquidity * LIQUIDITY_GROWTH_FACTOR; } // apply the trading liquidity cap targetBNTTradingLiquidity = Math.min(targetBNTTradingLiquidity, tradingLiquidityCap); // calculate the trading liquidity deltas and return them bntTradingLiquidityDelta = targetBNTTradingLiquidity - liquidity.bntTradingLiquidity; baseTokenTradingLiquidityDelta = MathEx.mulDivF(bntTradingLiquidityDelta, fundingRate.d, fundingRate.n); return TargetTradingLiquidity({ update: true, bnt: targetBNTTradingLiquidity, baseToken: liquidity.baseTokenTradingLiquidity + baseTokenTradingLiquidityDelta }); } // liquidity decrease // note that liquidity decrease isn't capped // calculate the trading liquidity deltas and return them bntTradingLiquidityDelta = liquidity.bntTradingLiquidity - targetBNTTradingLiquidity; baseTokenTradingLiquidityDelta = MathEx.mulDivF(bntTradingLiquidityDelta, fundingRate.d, fundingRate.n); return TargetTradingLiquidity({ update: true, bnt: targetBNTTradingLiquidity, baseToken: MathEx.subMax0(liquidity.baseTokenTradingLiquidity, baseTokenTradingLiquidityDelta) }); } /** * @dev adjusts the trading liquidity based on the newly added tokens delta amount, and funding limits */ function _updateTradingLiquidity( bytes32 contextId, Token pool, Pool storage data, Fraction memory fundingRate, uint256 minLiquidityForTrading ) private { // ensure that the base token reserve isn't empty uint256 baseTokenTotalLiquidity = pool.balanceOf(address(_masterVault)); if (baseTokenTotalLiquidity == 0) { revert InsufficientLiquidity(); } if (_poolRateState(data) == PoolRateState.Unstable) { return; } PoolLiquidity memory prevLiquidity = data.liquidity; if (!fundingRate.isPositive()) { _resetTradingLiquidity(contextId, pool, data, prevLiquidity, TRADING_STATUS_UPDATE_MIN_LIQUIDITY); return; } TargetTradingLiquidity memory targetTradingLiquidity = _calcTargetTradingLiquidity( baseTokenTotalLiquidity, _networkSettings.poolFundingLimit(pool), _bntPool.currentPoolFunding(pool), prevLiquidity, fundingRate, minLiquidityForTrading ); if (!targetTradingLiquidity.update) { return; } if (targetTradingLiquidity.bnt == 0 || targetTradingLiquidity.baseToken == 0) { _resetTradingLiquidity(contextId, pool, data, prevLiquidity, TRADING_STATUS_UPDATE_MIN_LIQUIDITY); return; } // update funding from the BNT pool if (targetTradingLiquidity.bnt > prevLiquidity.bntTradingLiquidity) { _bntPool.requestFunding(contextId, pool, targetTradingLiquidity.bnt - prevLiquidity.bntTradingLiquidity); } else if (targetTradingLiquidity.bnt < prevLiquidity.bntTradingLiquidity) { _bntPool.renounceFunding(contextId, pool, prevLiquidity.bntTradingLiquidity - targetTradingLiquidity.bnt); } // trading liquidity is assumed to never exceed 128 bits (the cast below will revert otherwise) PoolLiquidity memory newLiquidity = PoolLiquidity({ bntTradingLiquidity: targetTradingLiquidity.bnt.toUint128(), baseTokenTradingLiquidity: targetTradingLiquidity.baseToken.toUint128(), stakedBalance: prevLiquidity.stakedBalance }); // update the liquidity data of the pool data.liquidity = newLiquidity; _dispatchTradingLiquidityEvents(contextId, pool, prevLiquidity, newLiquidity); } function _dispatchTradingLiquidityEvents( bytes32 contextId, Token pool, PoolLiquidity memory prevLiquidity, PoolLiquidity memory newLiquidity ) private { if (newLiquidity.bntTradingLiquidity != prevLiquidity.bntTradingLiquidity) { emit TradingLiquidityUpdated({ contextId: contextId, pool: pool, token: Token(address(_bnt)), prevLiquidity: prevLiquidity.bntTradingLiquidity, newLiquidity: newLiquidity.bntTradingLiquidity }); } if (newLiquidity.baseTokenTradingLiquidity != prevLiquidity.baseTokenTradingLiquidity) { emit TradingLiquidityUpdated({ contextId: contextId, pool: pool, token: pool, prevLiquidity: prevLiquidity.baseTokenTradingLiquidity, newLiquidity: newLiquidity.baseTokenTradingLiquidity }); } } /** * @dev resets trading liquidity and renounces any remaining BNT funding */ function _resetTradingLiquidity( bytes32 contextId, Token pool, Pool storage data, PoolLiquidity memory prevLiquidity, uint8 reason ) private { _resetTradingLiquidity(contextId, pool, data, prevLiquidity, data.liquidity.bntTradingLiquidity, reason); } /** * @dev resets trading liquidity and renounces any remaining BNT funding */ function _resetTradingLiquidity( bytes32 contextId, Token pool, Pool storage data, PoolLiquidity memory prevLiquidity, uint256 currentBNTTradingLiquidity, uint8 reason ) private { // reset the network and base token trading liquidities data.liquidity.bntTradingLiquidity = 0; data.liquidity.baseTokenTradingLiquidity = 0; // reset the recent average rage data.averageRates = AverageRates({ blockNumber: 0, rate: zeroFraction112(), invRate: zeroFraction112() }); // ensure that trading is disabled if (data.tradingEnabled) { data.tradingEnabled = false; emit TradingEnabled({ pool: pool, newStatus: false, reason: reason }); } // renounce all network liquidity if (currentBNTTradingLiquidity > 0) { _bntPool.renounceFunding(contextId, pool, currentBNTTradingLiquidity); } _dispatchTradingLiquidityEvents(contextId, pool, prevLiquidity, data.liquidity); } /** * @dev returns initial trading params */ function _initTrade( bytes32 contextId, Token sourceToken, Token targetToken, uint256 amount, uint256 limit, bool bySourceAmount ) private view returns (TradeIntermediateResult memory result) { // ensure that BNT is either the source or the target token bool isSourceBNT = sourceToken.isEqual(_bnt); bool isTargetBNT = targetToken.isEqual(_bnt); if (isSourceBNT && !isTargetBNT) { result.isSourceBNT = true; result.pool = targetToken; } else if (!isSourceBNT && isTargetBNT) { result.isSourceBNT = false; result.pool = sourceToken; } else { // BNT isn't one of the tokens or is both of them revert DoesNotExist(); } Pool storage data = _poolStorage(result.pool); // verify that trading is enabled if (!data.tradingEnabled) { revert TradingDisabled(); } result.contextId = contextId; result.bySourceAmount = bySourceAmount; if (result.bySourceAmount) { result.sourceAmount = amount; } else { result.targetAmount = amount; } result.limit = limit; result.tradingFeePPM = data.tradingFeePPM; PoolLiquidity memory liquidity = data.liquidity; if (result.isSourceBNT) { result.sourceBalance = liquidity.bntTradingLiquidity; result.targetBalance = liquidity.baseTokenTradingLiquidity; } else { result.sourceBalance = liquidity.baseTokenTradingLiquidity; result.targetBalance = liquidity.bntTradingLiquidity; } result.stakedBalance = liquidity.stakedBalance; } /** * @dev returns trade amount and fee by providing the source amount */ function _tradeAmountAndFeeBySourceAmount( uint256 sourceBalance, uint256 targetBalance, uint32 feePPM, uint256 sourceAmount ) private pure returns (TradeAmountAndTradingFee memory) { if (sourceBalance == 0 || targetBalance == 0) { revert InsufficientLiquidity(); } uint256 targetAmount = MathEx.mulDivF(targetBalance, sourceAmount, sourceBalance + sourceAmount); uint256 tradingFeeAmount = MathEx.mulDivF(targetAmount, feePPM, PPM_RESOLUTION); return TradeAmountAndTradingFee({ amount: targetAmount - tradingFeeAmount, tradingFeeAmount: tradingFeeAmount }); } /** * @dev returns trade amount and fee by providing either the target amount */ function _tradeAmountAndFeeByTargetAmount( uint256 sourceBalance, uint256 targetBalance, uint32 feePPM, uint256 targetAmount ) private pure returns (TradeAmountAndTradingFee memory) { if (sourceBalance == 0) { revert InsufficientLiquidity(); } uint256 tradingFeeAmount = MathEx.mulDivF(targetAmount, feePPM, PPM_RESOLUTION - feePPM); uint256 fullTargetAmount = targetAmount + tradingFeeAmount; uint256 sourceAmount = MathEx.mulDivF(sourceBalance, fullTargetAmount, targetBalance - fullTargetAmount); return TradeAmountAndTradingFee({ amount: sourceAmount, tradingFeeAmount: tradingFeeAmount }); } /** * @dev processes a trade by providing either the source or the target amount and updates the in-memory intermediate * result */ function _processTrade(TradeIntermediateResult memory result) private view { TradeAmountAndTradingFee memory tradeAmountAndFee; if (result.bySourceAmount) { tradeAmountAndFee = _tradeAmountAndFeeBySourceAmount( result.sourceBalance, result.targetBalance, result.tradingFeePPM, result.sourceAmount ); result.targetAmount = tradeAmountAndFee.amount; // ensure that the target amount is above the requested minimum return amount if (result.targetAmount < result.limit) { revert InsufficientTargetAmount(); } } else { tradeAmountAndFee = _tradeAmountAndFeeByTargetAmount( result.sourceBalance, result.targetBalance, result.tradingFeePPM, result.targetAmount ); result.sourceAmount = tradeAmountAndFee.amount; // ensure that the user has provided enough tokens to make the trade if (result.sourceAmount == 0 || result.sourceAmount > result.limit) { revert InsufficientSourceAmount(); } } result.tradingFeeAmount = tradeAmountAndFee.tradingFeeAmount; // sync the trading and staked balance result.sourceBalance += result.sourceAmount; result.targetBalance -= result.targetAmount; if (result.isSourceBNT) { result.stakedBalance += result.tradingFeeAmount; } _processNetworkFee(result); } /** * @dev processes the network fee and updates the in-memory intermediate result */ function _processNetworkFee(TradeIntermediateResult memory result) private view { if (_networkFeePPM == 0) { return; } // calculate the target network fee amount uint256 targetNetworkFeeAmount = MathEx.mulDivF(result.tradingFeeAmount, _networkFeePPM, PPM_RESOLUTION); // update the target balance (but don't deduct it from the full trading fee amount) result.targetBalance -= targetNetworkFeeAmount; if (!result.isSourceBNT) { result.networkFeeAmount = targetNetworkFeeAmount; return; } // trade the network fee (taken from the base token) to BNT result.networkFeeAmount = _tradeAmountAndFeeBySourceAmount( result.targetBalance, result.sourceBalance, 0, targetNetworkFeeAmount ).amount; // since we have received the network fee in base tokens and have traded them for BNT (so that the network fee // is always kept in BNT), we'd need to adapt the trading liquidity and the staked balance accordingly result.targetBalance += targetNetworkFeeAmount; result.sourceBalance -= result.networkFeeAmount; result.stakedBalance -= targetNetworkFeeAmount; } /** * @dev performs a trade */ function _performTrade(TradeIntermediateResult memory result) private { Pool storage data = _poolData[result.pool]; PoolLiquidity memory prevLiquidity = data.liquidity; // update the recent average rate _updateAverageRates( data, Fraction({ n: prevLiquidity.bntTradingLiquidity, d: prevLiquidity.baseTokenTradingLiquidity }) ); _processTrade(result); // trading liquidity is assumed to never exceed 128 bits (the cast below will revert otherwise) PoolLiquidity memory newLiquidity = PoolLiquidity({ bntTradingLiquidity: (result.isSourceBNT ? result.sourceBalance : result.targetBalance).toUint128(), baseTokenTradingLiquidity: (result.isSourceBNT ? result.targetBalance : result.sourceBalance).toUint128(), stakedBalance: result.stakedBalance }); _dispatchTradingLiquidityEvents(result.contextId, result.pool, prevLiquidity, newLiquidity); // update the liquidity data of the pool data.liquidity = newLiquidity; } /** * @dev returns the state of a pool's rate */ function _poolRateState(Pool storage data) internal view returns (PoolRateState) { Fraction memory spotRate = Fraction({ n: data.liquidity.bntTradingLiquidity, d: data.liquidity.baseTokenTradingLiquidity }); AverageRates memory averageRates = data.averageRates; Fraction112 memory rate = averageRates.rate; if (!spotRate.isPositive() || !rate.isPositive()) { return PoolRateState.Uninitialized; } Fraction memory invSpotRate = spotRate.inverse(); Fraction112 memory invRate = averageRates.invRate; if (!invSpotRate.isPositive() || !invRate.isPositive()) { return PoolRateState.Uninitialized; } AverageRates memory effectiveAverageRates = _effectiveAverageRates(averageRates, spotRate); if ( MathEx.isInRange(effectiveAverageRates.rate.fromFraction112(), spotRate, RATE_MAX_DEVIATION_PPM) && MathEx.isInRange(effectiveAverageRates.invRate.fromFraction112(), invSpotRate, RATE_MAX_DEVIATION_PPM) ) { return PoolRateState.Stable; } return PoolRateState.Unstable; } /** * @dev updates the average rates */ function _updateAverageRates(Pool storage data, Fraction memory spotRate) private { data.averageRates = _effectiveAverageRates(data.averageRates, spotRate); } /** * @dev returns the effective average rates */ function _effectiveAverageRates( AverageRates memory averageRates, Fraction memory spotRate ) private view returns (AverageRates memory) { // if the spot rate is 0, reset the average rates if (!spotRate.isPositive()) { return AverageRates({ blockNumber: 0, rate: zeroFraction112(), invRate: zeroFraction112() }); } uint32 blockNumber = _blockNumber(); // can only be updated once in a single block uint32 prevUpdateBlock = averageRates.blockNumber; if (prevUpdateBlock == blockNumber) { return averageRates; } // if sufficient blocks have passed, or if one of the rates isn't positive, // reset the average rates if ( blockNumber - prevUpdateBlock >= RATE_RESET_BLOCK_THRESHOLD || !averageRates.rate.isPositive() || !averageRates.invRate.isPositive() ) { if (spotRate.isPositive()) { return AverageRates({ blockNumber: blockNumber, rate: spotRate.toFraction112(), invRate: spotRate.inverse().toFraction112() }); } return AverageRates({ blockNumber: 0, rate: zeroFraction112(), invRate: zeroFraction112() }); } return AverageRates({ blockNumber: blockNumber, rate: _calcAverageRate(averageRates.rate, spotRate), invRate: _calcAverageRate(averageRates.invRate, spotRate.inverse()) }); } /** * @dev calculates the average rate */ function _calcAverageRate( Fraction112 memory averageRate, Fraction memory rate ) private pure returns (Fraction112 memory) { if (rate.n * averageRate.d == rate.d * averageRate.n) { return averageRate; } return MathEx .weightedAverage(averageRate.fromFraction112(), rate, EMA_AVERAGE_RATE_WEIGHT, EMA_SPOT_RATE_WEIGHT) .toFraction112(); } /** * @dev verifies if the provided rate is valid */ function _validRate(Fraction memory rate) internal pure { if (!rate.isPositive()) { revert InvalidRate(); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (access/IAccessControlEnumerable.sol) pragma solidity ^0.8.0; import "./IAccessControlUpgradeable.sol"; /** * @dev External interface of AccessControlEnumerable declared to support ERC165 detection. */ interface IAccessControlEnumerableUpgradeable is IAccessControlUpgradeable { /** * @dev Returns one of the accounts that have `role`. `index` must be a * value between 0 and {getRoleMemberCount}, non-inclusive. * * Role bearers are not sorted in any particular way, and their ordering may * change at any point. * * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure * you perform all queries on the same block. See the following * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] * for more information. */ function getRoleMember(bytes32 role, uint256 index) external view returns (address); /** * @dev Returns the number of accounts that have `role`. Can be used * together with {getRoleMember} to enumerate all bearers of a role. */ function getRoleMemberCount(bytes32 role) external view returns (uint256); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol) pragma solidity ^0.8.0; /** * @dev External interface of AccessControl declared to support ERC165 detection. */ interface IAccessControlUpgradeable { /** * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` * * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite * {RoleAdminChanged} not being emitted signaling this. * * _Available since v3.1._ */ event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); /** * @dev Emitted when `account` is granted `role`. * * `sender` is the account that originated the contract call, an admin role * bearer except when using {AccessControl-_setupRole}. */ event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Emitted when `account` is revoked `role`. * * `sender` is the account that originated the contract call: * - if using `revokeRole`, it is the admin role bearer * - if using `renounceRole`, it is the role bearer (i.e. `account`) */ event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Returns `true` if `account` has been granted `role`. */ function hasRole(bytes32 role, address account) external view returns (bool); /** * @dev Returns the admin role that controls `role`. See {grantRole} and * {revokeRole}. * * To change a role's admin, use {AccessControl-_setRoleAdmin}. */ function getRoleAdmin(bytes32 role) external view returns (bytes32); /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function grantRole(bytes32 role, address account) external; /** * @dev Revokes `role` from `account`. * * If `account` had been granted `role`, emits a {RoleRevoked} event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function revokeRole(bytes32 role, address account) external; /** * @dev Revokes `role` from the calling account. * * Roles are often managed via {grantRole} and {revokeRole}: this function's * purpose is to provide a mechanism for accounts to lose their privileges * if they are compromised (such as when a trusted device is misplaced). * * If the calling account had been granted `role`, emits a {RoleRevoked} * event. * * Requirements: * * - the caller must be `account`. */ function renounceRole(bytes32 role, address account) external; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = _msgSender(); _approve(owner, spender, _allowances[owner][spender] + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { address owner = _msgSender(); uint256 currentAllowance = _allowances[owner][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `sender` to `recipient`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer( address from, address to, uint256 amount ) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; } _balances[to] += amount; emit Transfer(from, to, amount); _afterTokenTransfer(from, to, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Spend `amount` form the allowance of `owner` toward `spender`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a >= b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a / b + (a % b == 0 ? 0 : 1); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/math/SafeCast.sol) pragma solidity ^0.8.0; /** * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow * checks. * * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can * easily result in undesired exploitation or bugs, since developers usually * assume that overflows raise errors. `SafeCast` restores this intuition by * reverting the transaction when such an operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. * * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing * all math on `uint256` and `int256` and then downcasting. */ library SafeCast { /** * @dev Returns the downcasted uint224 from uint256, reverting on * overflow (when the input is greater than largest uint224). * * Counterpart to Solidity's `uint224` operator. * * Requirements: * * - input must fit into 224 bits */ function toUint224(uint256 value) internal pure returns (uint224) { require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits"); return uint224(value); } /** * @dev Returns the downcasted uint128 from uint256, reverting on * overflow (when the input is greater than largest uint128). * * Counterpart to Solidity's `uint128` operator. * * Requirements: * * - input must fit into 128 bits */ function toUint128(uint256 value) internal pure returns (uint128) { require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits"); return uint128(value); } /** * @dev Returns the downcasted uint96 from uint256, reverting on * overflow (when the input is greater than largest uint96). * * Counterpart to Solidity's `uint96` operator. * * Requirements: * * - input must fit into 96 bits */ function toUint96(uint256 value) internal pure returns (uint96) { require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits"); return uint96(value); } /** * @dev Returns the downcasted uint64 from uint256, reverting on * overflow (when the input is greater than largest uint64). * * Counterpart to Solidity's `uint64` operator. * * Requirements: * * - input must fit into 64 bits */ function toUint64(uint256 value) internal pure returns (uint64) { require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits"); return uint64(value); } /** * @dev Returns the downcasted uint32 from uint256, reverting on * overflow (when the input is greater than largest uint32). * * Counterpart to Solidity's `uint32` operator. * * Requirements: * * - input must fit into 32 bits */ function toUint32(uint256 value) internal pure returns (uint32) { require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits"); return uint32(value); } /** * @dev Returns the downcasted uint16 from uint256, reverting on * overflow (when the input is greater than largest uint16). * * Counterpart to Solidity's `uint16` operator. * * Requirements: * * - input must fit into 16 bits */ function toUint16(uint256 value) internal pure returns (uint16) { require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits"); return uint16(value); } /** * @dev Returns the downcasted uint8 from uint256, reverting on * overflow (when the input is greater than largest uint8). * * Counterpart to Solidity's `uint8` operator. * * Requirements: * * - input must fit into 8 bits. */ function toUint8(uint256 value) internal pure returns (uint8) { require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits"); return uint8(value); } /** * @dev Converts a signed int256 into an unsigned uint256. * * Requirements: * * - input must be greater than or equal to 0. */ function toUint256(int256 value) internal pure returns (uint256) { require(value >= 0, "SafeCast: value must be positive"); return uint256(value); } /** * @dev Returns the downcasted int128 from int256, reverting on * overflow (when the input is less than smallest int128 or * greater than largest int128). * * Counterpart to Solidity's `int128` operator. * * Requirements: * * - input must fit into 128 bits * * _Available since v3.1._ */ function toInt128(int256 value) internal pure returns (int128) { require(value >= type(int128).min && value <= type(int128).max, "SafeCast: value doesn't fit in 128 bits"); return int128(value); } /** * @dev Returns the downcasted int64 from int256, reverting on * overflow (when the input is less than smallest int64 or * greater than largest int64). * * Counterpart to Solidity's `int64` operator. * * Requirements: * * - input must fit into 64 bits * * _Available since v3.1._ */ function toInt64(int256 value) internal pure returns (int64) { require(value >= type(int64).min && value <= type(int64).max, "SafeCast: value doesn't fit in 64 bits"); return int64(value); } /** * @dev Returns the downcasted int32 from int256, reverting on * overflow (when the input is less than smallest int32 or * greater than largest int32). * * Counterpart to Solidity's `int32` operator. * * Requirements: * * - input must fit into 32 bits * * _Available since v3.1._ */ function toInt32(int256 value) internal pure returns (int32) { require(value >= type(int32).min && value <= type(int32).max, "SafeCast: value doesn't fit in 32 bits"); return int32(value); } /** * @dev Returns the downcasted int16 from int256, reverting on * overflow (when the input is less than smallest int16 or * greater than largest int16). * * Counterpart to Solidity's `int16` operator. * * Requirements: * * - input must fit into 16 bits * * _Available since v3.1._ */ function toInt16(int256 value) internal pure returns (int16) { require(value >= type(int16).min && value <= type(int16).max, "SafeCast: value doesn't fit in 16 bits"); return int16(value); } /** * @dev Returns the downcasted int8 from int256, reverting on * overflow (when the input is less than smallest int8 or * greater than largest int8). * * Counterpart to Solidity's `int8` operator. * * Requirements: * * - input must fit into 8 bits. * * _Available since v3.1._ */ function toInt8(int256 value) internal pure returns (int8) { require(value >= type(int8).min && value <= type(int8).max, "SafeCast: value doesn't fit in 8 bits"); return int8(value); } /** * @dev Converts an unsigned uint256 into a signed int256. * * Requirements: * * - input must be less than or equal to maxInt256. */ function toInt256(uint256 value) internal pure returns (int256) { // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256"); return int256(value); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/structs/EnumerableSet.sol) pragma solidity ^0.8.0; /** * @dev Library for managing * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive * types. * * Sets have the following properties: * * - Elements are added, removed, and checked for existence in constant time * (O(1)). * - Elements are enumerated in O(n). No guarantees are made on the ordering. * * ``` * contract Example { * // Add the library methods * using EnumerableSet for EnumerableSet.AddressSet; * * // Declare a set state variable * EnumerableSet.AddressSet private mySet; * } * ``` * * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`) * and `uint256` (`UintSet`) are supported. */ library EnumerableSet { // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Set type with // bytes32 values. // The Set implementation uses private functions, and user-facing // implementations (such as AddressSet) are just wrappers around the // underlying Set. // This means that we can only create new EnumerableSets for types that fit // in bytes32. struct Set { // Storage of set values bytes32[] _values; // Position of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping(bytes32 => uint256) _indexes; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function _add(Set storage set, bytes32 value) private returns (bool) { if (!_contains(set, value)) { set._values.push(value); // The value is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value set._indexes[value] = set._values.length; return true; } else { return false; } } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function _remove(Set storage set, bytes32 value) private returns (bool) { // We read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 0) { // Equivalent to contains(set, value) // To delete an element from the _values array in O(1), we swap the element to delete with the last one in // the array, and then remove the last element (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; if (lastIndex != toDeleteIndex) { bytes32 lastvalue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastvalue; // Update the index for the moved value set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex } // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[value]; return true; } else { return false; } } /** * @dev Returns true if the value is in the set. O(1). */ function _contains(Set storage set, bytes32 value) private view returns (bool) { return set._indexes[value] != 0; } /** * @dev Returns the number of values on the set. O(1). */ function _length(Set storage set) private view returns (uint256) { return set._values.length; } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Set storage set, uint256 index) private view returns (bytes32) { return set._values[index]; } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function _values(Set storage set) private view returns (bytes32[] memory) { return set._values; } // Bytes32Set struct Bytes32Set { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _add(set._inner, value); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _remove(set._inner, value); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) { return _contains(set._inner, value); } /** * @dev Returns the number of values in the set. O(1). */ function length(Bytes32Set storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) { return _at(set._inner, index); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(Bytes32Set storage set) internal view returns (bytes32[] memory) { return _values(set._inner); } // AddressSet struct AddressSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(AddressSet storage set, address value) internal returns (bool) { return _add(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(AddressSet storage set, address value) internal returns (bool) { return _remove(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(AddressSet storage set, address value) internal view returns (bool) { return _contains(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns the number of values in the set. O(1). */ function length(AddressSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(AddressSet storage set, uint256 index) internal view returns (address) { return address(uint160(uint256(_at(set._inner, index)))); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(AddressSet storage set) internal view returns (address[] memory) { bytes32[] memory store = _values(set._inner); address[] memory result; assembly { result := store } return result; } // UintSet struct UintSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(UintSet storage set, uint256 value) internal returns (bool) { return _add(set._inner, bytes32(value)); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(UintSet storage set, uint256 value) internal returns (bool) { return _remove(set._inner, bytes32(value)); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(UintSet storage set, uint256 value) internal view returns (bool) { return _contains(set._inner, bytes32(value)); } /** * @dev Returns the number of values on the set. O(1). */ function length(UintSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintSet storage set, uint256 index) internal view returns (uint256) { return uint256(_at(set._inner, index)); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(UintSet storage set) internal view returns (uint256[] memory) { bytes32[] memory store = _values(set._inner); uint256[] memory result; assembly { result := store } return result; } }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import { IUpgradeable } from "../../utility/interfaces/IUpgradeable.sol"; import { Token } from "../../token/Token.sol"; import { IPoolCollection } from "../../pools/interfaces/IPoolCollection.sol"; import { IPoolToken } from "../../pools/interfaces/IPoolToken.sol"; /** * @dev Flash-loan recipient interface */ interface IFlashLoanRecipient { /** * @dev a flash-loan recipient callback after each the caller must return the borrowed amount and an additional fee */ function onFlashLoan( address caller, IERC20 erc20Token, uint256 amount, uint256 feeAmount, bytes memory data ) external; } /** * @dev Bancor Network interface */ interface IBancorNetwork is IUpgradeable { /** * @dev returns the set of all valid pool collections */ function poolCollections() external view returns (IPoolCollection[] memory); /** * @dev returns the set of all liquidity pools */ function liquidityPools() external view returns (Token[] memory); /** * @dev returns the respective pool collection for the provided pool */ function collectionByPool(Token pool) external view returns (IPoolCollection); /** * @dev creates new pools * * requirements: * * - none of the pools already exists */ function createPools(Token[] calldata tokens, IPoolCollection poolCollection) external; /** * @dev migrates a list of pools between pool collections * * notes: * * - invalid or incompatible pools will be skipped gracefully */ function migratePools(Token[] calldata pools, IPoolCollection newPoolCollection) external; /** * @dev deposits liquidity for the specified provider and returns the respective pool token amount * * requirements: * * - the caller must have approved the network to transfer the tokens on its behalf (except for in the * native token case) */ function depositFor( address provider, Token pool, uint256 tokenAmount ) external payable returns (uint256); /** * @dev deposits liquidity for the current provider and returns the respective pool token amount * * requirements: * * - the caller must have approved the network to transfer the tokens on its behalf (except for in the * native token case) */ function deposit(Token pool, uint256 tokenAmount) external payable returns (uint256); /** * @dev initiates liquidity withdrawal * * requirements: * * - the caller must have approved the contract to transfer the pool token amount on its behalf */ function initWithdrawal(IPoolToken poolToken, uint256 poolTokenAmount) external returns (uint256); /** * @dev cancels a withdrawal request, and returns the number of pool token amount associated with the withdrawal * request * * requirements: * * - the caller must have already initiated a withdrawal and received the specified id */ function cancelWithdrawal(uint256 id) external returns (uint256); /** * @dev withdraws liquidity and returns the withdrawn amount * * requirements: * * - the provider must have already initiated a withdrawal and received the specified id * - the specified withdrawal request is eligible for completion * - the provider must have approved the network to transfer vBNT amount on its behalf, when withdrawing BNT * liquidity */ function withdraw(uint256 id) external returns (uint256); /** * @dev performs a trade by providing the input source amount, sends the proceeds to the optional beneficiary (or * to the address of the caller, in case it's not supplied), and returns the trade target amount * * requirements: * * - the caller must have approved the network to transfer the source tokens on its behalf (except for in the * native token case) */ function tradeBySourceAmount( Token sourceToken, Token targetToken, uint256 sourceAmount, uint256 minReturnAmount, uint256 deadline, address beneficiary ) external payable returns (uint256); /** * @dev performs a trade by providing the output target amount, sends the proceeds to the optional beneficiary (or * to the address of the caller, in case it's not supplied), and returns the trade source amount * * requirements: * * - the caller must have approved the network to transfer the source tokens on its behalf (except for in the * native token case) */ function tradeByTargetAmount( Token sourceToken, Token targetToken, uint256 targetAmount, uint256 maxSourceAmount, uint256 deadline, address beneficiary ) external payable returns (uint256); /** * @dev performs a trade by providing the input source amount, sends the proceeds to the optional beneficiary (or * to the address of the caller, in case it's not supplied), and returns the trade target amount * * requirements: * * - the caller must have approved the network to transfer the source tokens on its behalf (except for in the * native token case) * - the caller must be the _bancorArbitrage contract */ function tradeBySourceAmountArb( Token sourceToken, Token targetToken, uint256 sourceAmount, uint256 minReturnAmount, uint256 deadline, address beneficiary ) external payable returns (uint256); /** * @dev performs a trade by providing the output target amount, sends the proceeds to the optional beneficiary (or * to the address of the caller, in case it's not supplied), and returns the trade source amount * * requirements: * * - the caller must have approved the network to transfer the source tokens on its behalf (except for in the * native token case) * - the caller must be the _bancorArbitrage contract */ function tradeByTargetAmountArb( Token sourceToken, Token targetToken, uint256 targetAmount, uint256 maxSourceAmount, uint256 deadline, address beneficiary ) external payable returns (uint256); /** * @dev provides a flash-loan * * requirements: * * - the recipient's callback must return *at least* the borrowed amount and fee back to the specified return address */ function flashLoan( Token token, uint256 amount, IFlashLoanRecipient recipient, bytes calldata data ) external; /** * @dev deposits liquidity during a migration */ function migrateLiquidity( Token token, address provider, uint256 amount, uint256 availableAmount, uint256 originalAmount ) external payable; /** * @dev withdraws pending network fees, and returns the amount of fees withdrawn * * requirements: * * - the caller must have the ROLE_NETWORK_FEE_MANAGER privilege */ function withdrawNetworkFees(address recipient) external returns (uint256); /** * @dev withdraws surplus tokens from a given pool to CarbonPOL contract, * and disables trading on the given pool if it is not already disabled */ function withdrawPOL(Token pool) external returns (uint256); }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IUpgradeable } from "../../utility/interfaces/IUpgradeable.sol"; import { Token } from "../../token/Token.sol"; error NotWhitelisted(); error NotWhitelistedForPOL(); struct VortexRewards { // the percentage of converted BNT to be sent to the initiator of the burning event (in units of PPM) uint32 burnRewardPPM; // the maximum burn reward to be sent to the initiator of the burning event uint256 burnRewardMaxAmount; } /** * @dev Network Settings interface */ interface INetworkSettings is IUpgradeable { /** * @dev returns the protected tokens whitelist */ function protectedTokenWhitelist() external view returns (Token[] memory); /** * @dev checks whether a given token is whitelisted */ function isTokenWhitelisted(Token pool) external view returns (bool); /** * @dev returns the tokens whitelist for POL */ function tokenWhitelistForPOL() external view returns (Token[] memory); /** * @dev checks whether a given token is whitelist for POL */ function isTokenWhitelistedForPOL(Token pool) external view returns (bool); /** * @dev returns the BNT funding limit for a given pool */ function poolFundingLimit(Token pool) external view returns (uint256); /** * @dev returns the minimum BNT trading liquidity required before the system enables trading in the relevant pool */ function minLiquidityForTrading() external view returns (uint256); /** * @dev returns the withdrawal fee (in units of PPM) */ function withdrawalFeePPM() external view returns (uint32); /** * @dev returns the default flash-loan fee (in units of PPM) */ function defaultFlashLoanFeePPM() external view returns (uint32); /** * @dev returns the flash-loan fee (in units of PPM) of a pool */ function flashLoanFeePPM(Token pool) external view returns (uint32); /** * @dev returns the vortex settings */ function vortexRewards() external view returns (VortexRewards memory); }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { PPM_RESOLUTION as M } from "../utility/Constants.sol"; import { Sint256, Uint512, MathEx } from "../utility/MathEx.sol"; error PoolCollectionWithdrawalInputInvalid(); /** * @dev This library implements the mathematics behind base-token withdrawal. * It exposes a single function which takes the following input values: * `a` - BNT trading liquidity * `b` - base token trading liquidity * `c` - base token excess amount * `e` - base token staked amount * `w` - base token external protection vault balance * `m` - trading fee in PPM units * `n` - withdrawal fee in PPM units * `x` - base token withdrawal amount * And returns the following output values: * `p` - BNT amount to add to the trading liquidity and to the master vault * `q` - BNT amount to add to the protocol equity * `r` - base token amount to add to the trading liquidity * `s` - base token amount to transfer from the master vault to the provider * `t` - BNT amount to mint directly for the provider * `u` - base token amount to transfer from the external protection vault to the provider * `v` - base token amount to keep in the pool as a withdrawal fee * The following table depicts the actual formulae based on the current state of the system: * +-----------+---------------------------------------------------------+----------------------------------------------------------+ * | | Deficit | Surplus | * +-----------+---------------------------------------------------------+----------------------------------------------------------+ * | | p = a*x*(e*(1-n)-b-c)*(1-m)/(b*e-x*(e*(1-n)-b-c)*(1-m)) | p = -a*x*(b+c-e*(1-n))/(b*e*(1-m)+x*(b+c-e*(1-n))*(1-m)) | * | | q = 0 | q = 0 | * | | r = -x*(e*(1-n)-b-c)/e | r = x*(b+c-e*(1-n))/e | * | Arbitrage | s = x*(1-n) | s = x*(1-n) | * | | t = 0 | t = 0 | * | | u = 0 | u = 0 | * | | v = x*n | v = x*n | * +-----------+---------------------------------------------------------+----------------------------------------------------------+ * | | p = -a*z/(b*e) where z = max(x*(1-n)*b-c*(e-x*(1-n)),0) | p = -a*z/b where z = max(x*(1-n)-c,0) | * | | q = -a*z/(b*e) where z = max(x*(1-n)*b-c*(e-x*(1-n)),0) | q = -a*z/b where z = max(x*(1-n)-c,0) | * | | r = -z/e where z = max(x*(1-n)*b-c*(e-x*(1-n)),0) | r = -z where z = max(x*(1-n)-c,0) | * | Default | s = x*(1-n)*(b+c)/e | s = x*(1-n) | * | | t = see function `externalProtection` | t = 0 | * | | u = see function `externalProtection` | u = 0 | * | | v = x*n | v = x*n | * +-----------+---------------------------------------------------------+----------------------------------------------------------+ * | | p = 0 | p = 0 | * | | q = 0 | q = 0 | * | | r = 0 | r = 0 | * | Bootstrap | s = x*(1-n)*c/e | s = x*(1-n) | * | | t = see function `externalProtection` | t = 0 | * | | u = see function `externalProtection` | u = 0 | * | | v = x*n | v = x*n | * +-----------+---------------------------------------------------------+----------------------------------------------------------+ * Note that for the sake of illustration, both `m` and `n` are assumed normalized (between 0 and 1). * During runtime, it is taken into account that they are given in PPM units (between 0 and 1000000). */ library PoolCollectionWithdrawal { using MathEx for uint256; struct Output { Sint256 p; Sint256 q; Sint256 r; uint256 s; uint256 t; uint256 u; uint256 v; } /** * @dev returns `p`, `q`, `r`, `s`, `t`, `u` and `v` according to the current state: * +-------------------+-----------------------------------------------------------+ * | `e > (b+c)/(1-n)` | bootstrap deficit or default deficit or arbitrage deficit | * +-------------------+-----------------------------------------------------------+ * | `e < (b+c)` | bootstrap surplus or default surplus or arbitrage surplus | * +-------------------+-----------------------------------------------------------+ * | otherwise | bootstrap surplus or default surplus | * +-------------------+-----------------------------------------------------------+ */ function calculateWithdrawalAmounts( uint256 a, // <= 2**128-1 uint256 b, // <= 2**128-1 uint256 c, // <= 2**128-1 uint256 e, // <= 2**128-1 uint256 w, // <= 2**128-1 uint256 m, // <= M == 1000000 uint256 n, // <= M == 1000000 uint256 x /// <= e <= 2**128-1 ) internal pure returns (Output memory output) { if ( a > type(uint128).max || b > type(uint128).max || c > type(uint128).max || e > type(uint128).max || w > type(uint128).max || m > M || n > M || x > e ) { revert PoolCollectionWithdrawalInputInvalid(); } uint256 y = (x * (M - n)) / M; if ((e * (M - n)) / M > b + c) { uint256 f = (e * (M - n)) / M - (b + c); uint256 g = e - (b + c); if (isStable(b, c, e, x) && affordableDeficit(b, e, f, g, m, n, x)) { output = arbitrageDeficit(a, b, e, f, m, x, y); } else if (a > 0) { output = defaultDeficit(a, b, c, e, y); (output.t, output.u) = externalProtection(a, b, e, g, y, w); } else { output.s = (y * c) / e; (output.t, output.u) = externalProtection(a, b, e, g, y, w); } } else { uint256 f = MathEx.subMax0(b + c, e); if (f > 0 && isStable(b, c, e, x) && affordableSurplus(b, e, f, m, n, x)) { output = arbitrageSurplus(a, b, e, f, m, n, x, y); } else if (a > 0) { output = defaultSurplus(a, b, c, y); } else { output.s = y; } } output.v = x - y; } /** * @dev returns `x < e*c/(b+c)` */ function isStable( uint256 b, // <= 2**128-1 uint256 c, // <= 2**128-1 uint256 e, // <= 2**128-1 uint256 x /// <= e <= 2**128-1 ) private pure returns (bool) { return b * x < c * (e - x); } /** * @dev returns `b*e*((e*(1-n)-b-c)*m+e*n) > (e*(1-n)-b-c)*x*(e-b-c)*(1-m)` */ function affordableDeficit( uint256 /*b*/, // <= 2**128-1 uint256 /*e*/, // <= 2**128-1 uint256 /*f*/, // == e*(1-n)-b-c <= e <= 2**128-1 uint256 /*g*/, // == e-b-c <= e <= 2**128-1 uint256 /*m*/, // <= M == 1000000 uint256 /*n*/, // <= M == 1000000 uint256 /*x*/ /// < e*c/(b+c) <= e <= 2**128-1 ) private pure returns (bool) { // temporarily disabled //Uint512 memory lhs = MathEx.mul512(b * e, f * m + e * n); //Uint512 memory rhs = MathEx.mul512(f * x, g * (M - m)); //return MathEx.gt512(lhs, rhs); return false; } /** * @dev returns `b*e*((b+c-e)*m+e*n) > (b+c-e)*x*(b+c-e*(1-n))*(1-m)` */ function affordableSurplus( uint256 b, // <= 2**128-1 uint256 e, // <= 2**128-1 uint256 f, // == b+c-e <= 2**129-2 uint256 m, // <= M == 1000000 uint256 n, // <= M == 1000000 uint256 x /// < e*c/(b+c) <= e <= 2**128-1 ) private pure returns (bool) { Uint512 memory lhs = MathEx.mul512(b * e, (f * m + e * n) * M); Uint512 memory rhs = MathEx.mul512(f * x, (f * M + e * n) * (M - m)); return MathEx.gt512(lhs, rhs); // `x < e*c/(b+c)` --> `f*x < e*c*(b+c-e)/(b+c) <= e*c <= 2**256-1` } /** * @dev returns: * `p = a*x*(e*(1-n)-b-c)*(1-m)/(b*e-x*(e*(1-n)-b-c)*(1-m))` * `q = 0` * `r = -x*(e*(1-n)-b-c)/e` * `s = x*(1-n)` */ function arbitrageDeficit( uint256 a, // <= 2**128-1 uint256 b, // <= 2**128-1 uint256 e, // <= 2**128-1 uint256 f, // == e*(1-n)-b-c <= e <= 2**128-1 uint256 m, // <= M == 1000000 uint256 x, // <= e <= 2**128-1 uint256 y /// == x*(1-n) <= x <= e <= 2**128-1 ) private pure returns (Output memory output) { uint256 i = f * (M - m); uint256 j = mulSubMulDivF(b, e * M, x, i, 1); output.p = MathEx.mulDivF(a * x, i, j).toPos256(); output.r = MathEx.mulDivF(x, f, e).toNeg256(); output.s = y; } /** * @dev returns: * `p = -a*x*(b+c-e*(1-n))/(b*e*(1-m)+x*(b+c-e*(1-n))*(1-m))` * `q = 0` * `r = x*(b+c-e*(1-n))/e` * `s = x*(1-n)` */ function arbitrageSurplus( uint256 a, // <= 2**128-1 uint256 b, // <= 2**128-1 uint256 e, // <= 2**128-1 uint256 f, // == b+c-e <= 2**129-2 uint256 m, // <= M == 1000000 uint256 n, // <= M == 1000000 uint256 x, // <= e <= 2**128-1 uint256 y /// == x*(1-n) <= x <= e <= 2**128-1 ) private pure returns (Output memory output) { uint256 i = f * M + e * n; uint256 j = mulAddMulDivF(b, e * (M - m), x, i * (M - m), M); output.p = MathEx.mulDivF(a * x, i, j).toNeg256(); output.r = MathEx.mulDivF(x, i, e * M).toPos256(); output.s = y; } /** * @dev returns: * `p = -a*z/(b*e)` where `z = max(x*(1-n)*b-c*(e-x*(1-n)),0)` * `q = -a*z/(b*e)` where `z = max(x*(1-n)*b-c*(e-x*(1-n)),0)` * `r = -z/e` where `z = max(x*(1-n)*b-c*(e-x*(1-n)),0)` * `s = x*(1-n)*(b+c)/e` */ function defaultDeficit( uint256 a, // <= 2**128-1 uint256 b, // <= 2**128-1 uint256 c, // <= 2**128-1 uint256 e, // <= 2**128-1 uint256 y /// == x*(1-n) <= x <= e <= 2**128-1 ) private pure returns (Output memory output) { uint256 z = MathEx.subMax0(y * b, c * (e - y)); output.p = MathEx.mulDivF(a, z, b * e).toNeg256(); output.q = output.p; output.r = (z / e).toNeg256(); output.s = MathEx.mulDivF(y, b + c, e); } /** * @dev returns: * `p = -a*z/b` where `z = max(x*(1-n)-c,0)` * `q = -a*z/b` where `z = max(x*(1-n)-c,0)` * `r = -z` where `z = max(x*(1-n)-c,0)` * `s = x*(1-n)` */ function defaultSurplus( uint256 a, // <= 2**128-1 uint256 b, // <= 2**128-1 uint256 c, // <= 2**128-1 uint256 y /// == x*(1-n) <= x <= e <= 2**128-1 ) private pure returns (Output memory output) { uint256 z = MathEx.subMax0(y, c); output.p = MathEx.mulDivF(a, z, b).toNeg256(); output.q = output.p; output.r = z.toNeg256(); output.s = y; } /** * @dev returns `t` and `u` according to the current state: * +-----------------------+-------+---------------------------+-------------------+ * | x*(1-n)*(e-b-c)/e > w | a > 0 | t | u | * +-----------------------+-------+---------------------------+-------------------+ * | true | true | a*(x*(1-n)*(e-b-c)/e-w)/b | w | * +-----------------------+-------+---------------------------+-------------------+ * | true | false | 0 | w | * +-----------------------+-------+---------------------------+-------------------+ * | false | true | 0 | x*(1-n)*(e-b-c)/e | * +-----------------------+-------+---------------------------+-------------------+ * | false | false | 0 | x*(1-n)*(e-b-c)/e | * +-----------------------+-------+---------------------------+-------------------+ */ function externalProtection( uint256 a, // <= 2**128-1 uint256 b, // <= 2**128-1 uint256 e, // <= 2**128-1 uint256 g, // == e-b-c <= e <= 2**128-1 uint256 y, // == x*(1-n) <= x <= e <= 2**128-1 uint256 w /// <= 2**128-1 ) private pure returns (uint256 t, uint256 u) { uint256 yg = y * g; uint256 we = w * e; if (yg > we) { t = a > 0 ? MathEx.mulDivF(a, yg - we, b * e) : 0; u = w; } else { t = 0; u = yg / e; } } /** * @dev returns `a*b+x*y/z` */ function mulAddMulDivF(uint256 a, uint256 b, uint256 x, uint256 y, uint256 z) private pure returns (uint256) { return a * b + MathEx.mulDivF(x, y, z); } /** * @dev returns `a*b-x*y/z` */ function mulSubMulDivF(uint256 a, uint256 b, uint256 x, uint256 y, uint256 z) private pure returns (uint256) { return a * b - MathEx.mulDivF(x, y, z); } }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IPoolToken } from "./IPoolToken.sol"; import { Token } from "../../token/Token.sol"; import { IVault } from "../../vaults/interfaces/IVault.sol"; // the BNT pool token manager role is required to access the BNT pool tokens bytes32 constant ROLE_BNT_POOL_TOKEN_MANAGER = keccak256("ROLE_BNT_POOL_TOKEN_MANAGER"); // the BNT manager role is required to request the BNT pool to mint BNT bytes32 constant ROLE_BNT_MANAGER = keccak256("ROLE_BNT_MANAGER"); // the vault manager role is required to request the BNT pool to burn BNT from the master vault bytes32 constant ROLE_VAULT_MANAGER = keccak256("ROLE_VAULT_MANAGER"); // the funding manager role is required to request or renounce funding from the BNT pool bytes32 constant ROLE_FUNDING_MANAGER = keccak256("ROLE_FUNDING_MANAGER"); /** * @dev BNT Pool interface */ interface IBNTPool is IVault { /** * @dev returns the BNT pool token contract */ function poolToken() external view returns (IPoolToken); /** * @dev returns the total staked BNT balance in the network */ function stakedBalance() external view returns (uint256); /** * @dev returns the current funding of given pool */ function currentPoolFunding(Token pool) external view returns (uint256); /** * @dev returns the available BNT funding for a given pool */ function availableFunding(Token pool) external view returns (uint256); /** * @dev converts the specified pool token amount to the underlying BNT amount */ function poolTokenToUnderlying(uint256 poolTokenAmount) external view returns (uint256); /** * @dev converts the specified underlying BNT amount to pool token amount */ function underlyingToPoolToken(uint256 bntAmount) external view returns (uint256); /** * @dev returns the number of pool token to burn in order to increase everyone's underlying value by the specified * amount */ function poolTokenAmountToBurn(uint256 bntAmountToDistribute) external view returns (uint256); /** * @dev mints BNT to the recipient * * requirements: * * - the caller must have the ROLE_BNT_MANAGER role */ function mint(address recipient, uint256 bntAmount) external; /** * @dev burns BNT from the vault * * requirements: * * - the caller must have the ROLE_VAULT_MANAGER role */ function burnFromVault(uint256 bntAmount) external; /** * @dev deposits BNT liquidity on behalf of a specific provider and returns the respective pool token amount * * requirements: * * - the caller must be the network contract * - BNT tokens must have been already deposited into the contract */ function depositFor( bytes32 contextId, address provider, uint256 bntAmount, bool isMigrating, uint256 originalVBNTAmount ) external returns (uint256); /** * @dev withdraws BNT liquidity on behalf of a specific provider and returns the withdrawn BNT amount * * requirements: * * - the caller must be the network contract * - bnBNT token must have been already deposited into the contract * - vBNT token must have been already deposited into the contract */ function withdraw( bytes32 contextId, address provider, uint256 poolTokenAmount, uint256 bntAmount ) external returns (uint256); /** * @dev returns the withdrawn BNT amount */ function withdrawalAmount(uint256 poolTokenAmount) external view returns (uint256); /** * @dev requests BNT funding * * requirements: * * - the caller must have the ROLE_FUNDING_MANAGER role * - the token must have been whitelisted * - the request amount should be below the funding limit for a given pool * - the average rate of the pool must not deviate too much from its spot rate */ function requestFunding( bytes32 contextId, Token pool, uint256 bntAmount ) external; /** * @dev renounces BNT funding * * requirements: * * - the caller must have the ROLE_FUNDING_MANAGER role * - the token must have been whitelisted * - the average rate of the pool must not deviate too much from its spot rate */ function renounceFunding( bytes32 contextId, Token pool, uint256 bntAmount ) external; /** * @dev notifies the pool of accrued fees * * requirements: * * - the caller must be the network contract */ function onFeesCollected( Token pool, uint256 feeAmount, bool isTradeFee ) external; }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IVersioned } from "../../utility/interfaces/IVersioned.sol"; import { Fraction112 } from "../../utility/FractionLibrary.sol"; import { Token } from "../../token/Token.sol"; import { IPoolToken } from "./IPoolToken.sol"; struct PoolLiquidity { uint128 bntTradingLiquidity; // the BNT trading liquidity uint128 baseTokenTradingLiquidity; // the base token trading liquidity uint256 stakedBalance; // the staked balance } struct AverageRates { uint32 blockNumber; Fraction112 rate; Fraction112 invRate; } struct Pool { IPoolToken poolToken; // the pool token of the pool uint32 tradingFeePPM; // the trading fee (in units of PPM) bool tradingEnabled; // whether trading is enabled bool depositingEnabled; // whether depositing is enabled AverageRates averageRates; // the recent average rates PoolLiquidity liquidity; // the overall liquidity in the pool } struct WithdrawalAmounts { uint256 totalAmount; uint256 baseTokenAmount; uint256 bntAmount; } // trading enabling/disabling reasons uint8 constant TRADING_STATUS_UPDATE_DEFAULT = 0; uint8 constant TRADING_STATUS_UPDATE_ADMIN = 1; uint8 constant TRADING_STATUS_UPDATE_MIN_LIQUIDITY = 2; uint8 constant TRADING_STATUS_UPDATE_INVALID_STATE = 3; uint8 constant TRADING_STATUS_UPDATE_NETWORK_DISABLE = 4; struct TradeAmountAndFee { uint256 amount; // the source/target amount (depending on the context) resulting from the trade uint256 tradingFeeAmount; // the trading fee amount uint256 networkFeeAmount; // the network fee amount (always in units of BNT) } /** * @dev Pool Collection interface */ interface IPoolCollection is IVersioned { /** * @dev returns the type of the pool */ function poolType() external view returns (uint16); /** * @dev returns the default trading fee (in units of PPM) */ function defaultTradingFeePPM() external view returns (uint32); /** * @dev returns the network fee (in units of PPM) */ function networkFeePPM() external view returns (uint32); /** * @dev returns all the pools which are managed by this pool collection */ function pools() external view returns (Token[] memory); /** * @dev returns the number of all the pools which are managed by this pool collection */ function poolCount() external view returns (uint256); /** * @dev returns whether a pool is valid */ function isPoolValid(Token pool) external view returns (bool); /** * @dev returns the overall liquidity in the pool */ function poolLiquidity(Token pool) external view returns (PoolLiquidity memory); /** * @dev returns the pool token of the pool */ function poolToken(Token pool) external view returns (IPoolToken); /** * @dev returns the trading fee (in units of PPM) */ function tradingFeePPM(Token pool) external view returns (uint32); /** * @dev returns whether trading is enabled */ function tradingEnabled(Token pool) external view returns (bool); /** * @dev returns whether depositing is enabled */ function depositingEnabled(Token pool) external view returns (bool); /** * @dev returns whether the pool is stable */ function isPoolStable(Token pool) external view returns (bool); /** * @dev converts the specified pool token amount to the underlying base token amount */ function poolTokenToUnderlying(Token pool, uint256 poolTokenAmount) external view returns (uint256); /** * @dev converts the specified underlying base token amount to pool token amount */ function underlyingToPoolToken(Token pool, uint256 baseTokenAmount) external view returns (uint256); /** * @dev returns the number of pool token to burn in order to increase everyone's underlying value by the specified * amount */ function poolTokenAmountToBurn( Token pool, uint256 baseTokenAmountToDistribute, uint256 protocolPoolTokenAmount ) external view returns (uint256); /** * @dev creates a new pool * * requirements: * * - the caller must be the network contract * - the pool should have been whitelisted * - the pool isn't already defined in the collection */ function createPool(Token token) external; /** * @dev deposits base token liquidity on behalf of a specific provider and returns the respective pool token amount * * requirements: * * - the caller must be the network contract * - assumes that the base token has been already deposited in the vault */ function depositFor( bytes32 contextId, address provider, Token pool, uint256 baseTokenAmount ) external returns (uint256); /** * @dev handles some of the withdrawal-related actions and returns the withdrawn base token amount * * requirements: * * - the caller must be the network contract * - the caller must have approved the collection to transfer/burn the pool token amount on its behalf */ function withdraw( bytes32 contextId, address provider, Token pool, uint256 poolTokenAmount, uint256 baseTokenAmount ) external returns (uint256); /** * @dev returns the amounts that would be returned if the position is currently withdrawn, * along with the breakdown of the base token and the BNT compensation */ function withdrawalAmounts(Token pool, uint256 poolTokenAmount) external view returns (WithdrawalAmounts memory); /** * @dev performs a trade by providing the source amount and returns the target amount and the associated fee * * requirements: * * - the caller must be the network contract */ function tradeBySourceAmount( bytes32 contextId, Token sourceToken, Token targetToken, uint256 sourceAmount, uint256 minReturnAmount, bool ignoreFees ) external returns (TradeAmountAndFee memory); /** * @dev performs a trade by providing the target amount and returns the required source amount and the associated fee * * requirements: * * - the caller must be the network contract */ function tradeByTargetAmount( bytes32 contextId, Token sourceToken, Token targetToken, uint256 targetAmount, uint256 maxSourceAmount, bool ignoreFees ) external returns (TradeAmountAndFee memory); /** * @dev returns the output amount and fee when trading by providing the source amount */ function tradeOutputAndFeeBySourceAmount( Token sourceToken, Token targetToken, uint256 sourceAmount ) external view returns (TradeAmountAndFee memory); /** * @dev returns the input amount and fee when trading by providing the target amount */ function tradeInputAndFeeByTargetAmount( Token sourceToken, Token targetToken, uint256 targetAmount ) external view returns (TradeAmountAndFee memory); /** * @dev notifies the pool of accrued fees * * requirements: * * - the caller must be the network contract */ function onFeesCollected(Token pool, uint256 feeAmount) external; /** * @dev migrates a pool to this pool collection * * requirements: * * - the caller must be the pool migrator contract */ function migratePoolIn(Token pool, Pool calldata data) external; /** * @dev migrates a pool from this pool collection * * requirements: * * - the caller must be the pool migrator contract */ function migratePoolOut(Token pool, IPoolCollection targetPoolCollection) external; /** * @dev disables trading on a pool * * requirements: * * - the caller must be the network contract */ function disableTradingByNetwork(Token pool) external; }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { Token } from "../../token/Token.sol"; import { IVersioned } from "../../utility/interfaces/IVersioned.sol"; import { IPoolCollection } from "./IPoolCollection.sol"; /** * @dev Pool Migrator interface */ interface IPoolMigrator is IVersioned { /** * @dev migrates a pool and returns the new pool collection it exists in * * notes: * * - invalid or incompatible pools will be skipped gracefully * * requirements: * * - the caller must be the network contract */ function migratePool(Token pool, IPoolCollection newPoolCollection) external; }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import { IERC20Permit } from "@openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol"; import { IERC20Burnable } from "../../token/interfaces/IERC20Burnable.sol"; import { Token } from "../../token/Token.sol"; import { IVersioned } from "../../utility/interfaces/IVersioned.sol"; import { IOwned } from "../../utility/interfaces/IOwned.sol"; /** * @dev Pool Token interface */ interface IPoolToken is IVersioned, IOwned, IERC20, IERC20Permit, IERC20Burnable { /** * @dev returns the address of the reserve token */ function reserveToken() external view returns (Token); /** * @dev increases the token supply and sends the new tokens to the given account * * requirements: * * - the caller must be the owner of the contract */ function mint(address recipient, uint256 amount) external; }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { Token } from "../../token/Token.sol"; import { IUpgradeable } from "../../utility/interfaces/IUpgradeable.sol"; import { IPoolToken } from "./IPoolToken.sol"; /** * @dev Pool Token Factory interface */ interface IPoolTokenFactory is IUpgradeable { /** * @dev returns the custom symbol override for a given reserve token */ function tokenSymbolOverride(Token token) external view returns (string memory); /** * @dev returns the custom decimals override for a given reserve token */ function tokenDecimalsOverride(Token token) external view returns (uint8); /** * @dev creates a pool token for the specified token */ function createPoolToken(Token token) external returns (IPoolToken); }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; /** * @dev extends the SafeERC20 library with additional operations */ library SafeERC20Ex { using SafeERC20 for IERC20; /** * @dev ensures that the spender has sufficient allowance */ function ensureApprove(IERC20 token, address spender, uint256 amount) internal { if (amount == 0) { return; } uint256 allowance = token.allowance(address(this), spender); if (allowance >= amount) { return; } if (allowance > 0) { token.safeApprove(spender, 0); } token.safeApprove(spender, amount); } }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; /** * @dev the main purpose of the Token interfaces is to ensure artificially that we won't use ERC20's standard functions, * but only their safe versions, which are provided by SafeERC20 and SafeERC20Ex via the TokenLibrary contract */ interface Token { }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import { SafeERC20Ex } from "./SafeERC20Ex.sol"; import { Token } from "./Token.sol"; /** * @dev This library implements ERC20 and SafeERC20 utilities for both the native token and for ERC20 tokens */ library TokenLibrary { using SafeERC20 for IERC20; using SafeERC20Ex for IERC20; error PermitUnsupported(); // the address that represents the native token reserve address private constant NATIVE_TOKEN_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE; // the symbol that represents the native token string private constant NATIVE_TOKEN_SYMBOL = "ETH"; // the decimals for the native token uint8 private constant NATIVE_TOKEN_DECIMALS = 18; // the token representing the native token Token public constant NATIVE_TOKEN = Token(NATIVE_TOKEN_ADDRESS); /** * @dev returns whether the provided token represents an ERC20 or the native token reserve */ function isNative(Token token) internal pure returns (bool) { return address(token) == NATIVE_TOKEN_ADDRESS; } /** * @dev returns the symbol of the native token/ERC20 token */ function symbol(Token token) internal view returns (string memory) { if (isNative(token)) { return NATIVE_TOKEN_SYMBOL; } return toERC20(token).symbol(); } /** * @dev returns the decimals of the native token/ERC20 token */ function decimals(Token token) internal view returns (uint8) { if (isNative(token)) { return NATIVE_TOKEN_DECIMALS; } return toERC20(token).decimals(); } /** * @dev returns the balance of the native token/ERC20 token */ function balanceOf(Token token, address account) internal view returns (uint256) { if (isNative(token)) { return account.balance; } return toIERC20(token).balanceOf(account); } /** * @dev transfers a specific amount of the native token/ERC20 token */ function safeTransfer(Token token, address to, uint256 amount) internal { if (amount == 0) { return; } if (isNative(token)) { payable(to).transfer(amount); } else { toIERC20(token).safeTransfer(to, amount); } } /** * @dev transfers a specific amount of the native token/ERC20 token from a specific holder using the allowance mechanism * * note that the function does not perform any action if the native token is provided */ function safeTransferFrom(Token token, address from, address to, uint256 amount) internal { if (amount == 0 || isNative(token)) { return; } toIERC20(token).safeTransferFrom(from, to, amount); } /** * @dev approves a specific amount of the native token/ERC20 token from a specific holder * * note that the function does not perform any action if the native token is provided */ function safeApprove(Token token, address spender, uint256 amount) internal { if (isNative(token)) { return; } toIERC20(token).safeApprove(spender, amount); } /** * @dev increases allowance of the native token/ERC20 token from a specific holder * * note that the function does not perform any action if the native token is provided */ function safeIncreaseAllowance(Token token, address spender, uint256 amount) internal { if (isNative(token)) { return; } toIERC20(token).safeIncreaseAllowance(spender, amount); } /** * @dev ensures that the spender has sufficient allowance * * note that the function does not perform any action if the native token is provided */ function ensureApprove(Token token, address spender, uint256 amount) internal { if (isNative(token)) { return; } toIERC20(token).ensureApprove(spender, amount); } /** * @dev compares between a token and another raw ERC20 token */ function isEqual(Token token, IERC20 erc20Token) internal pure returns (bool) { return toIERC20(token) == erc20Token; } /** * @dev utility function that converts a token to an IERC20 */ function toIERC20(Token token) internal pure returns (IERC20) { return IERC20(address(token)); } /** * @dev utility function that converts a token to an ERC20 */ function toERC20(Token token) internal pure returns (ERC20) { return ERC20(address(token)); } }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; /** * @dev burnable ERC20 interface */ interface IERC20Burnable { /** * @dev Destroys tokens from the caller. */ function burn(uint256 amount) external; /** * @dev Destroys tokens from a recipient, deducting from the caller's allowance * * requirements: * * - the caller must have allowance for recipient's tokens of at least the specified amount */ function burnFrom(address recipient, uint256 amount) external; }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; /** * @dev this contract abstracts the block number in order to allow for more flexible control in tests */ abstract contract BlockNumber { /** * @dev returns the current block-number */ function _blockNumber() internal view virtual returns (uint32) { return uint32(block.number); } }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; uint32 constant PPM_RESOLUTION = 1_000_000;
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; struct Fraction { uint256 n; uint256 d; } struct Fraction112 { uint112 n; uint112 d; } error InvalidFraction();
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { Fraction, Fraction112, InvalidFraction } from "./Fraction.sol"; import { MathEx } from "./MathEx.sol"; // solhint-disable-next-line func-visibility function zeroFraction() pure returns (Fraction memory) { return Fraction({ n: 0, d: 1 }); } // solhint-disable-next-line func-visibility function zeroFraction112() pure returns (Fraction112 memory) { return Fraction112({ n: 0, d: 1 }); } /** * @dev this library provides a set of fraction operations */ library FractionLibrary { /** * @dev returns whether a standard fraction is valid */ function isValid(Fraction memory fraction) internal pure returns (bool) { return fraction.d != 0; } /** * @dev returns whether a 112-bit fraction is valid */ function isValid(Fraction112 memory fraction) internal pure returns (bool) { return fraction.d != 0; } /** * @dev returns whether a standard fraction is positive */ function isPositive(Fraction memory fraction) internal pure returns (bool) { return isValid(fraction) && fraction.n != 0; } /** * @dev returns whether a 112-bit fraction is positive */ function isPositive(Fraction112 memory fraction) internal pure returns (bool) { return isValid(fraction) && fraction.n != 0; } /** * @dev returns the inverse of a given fraction */ function inverse(Fraction memory fraction) internal pure returns (Fraction memory) { Fraction memory invFraction = Fraction({ n: fraction.d, d: fraction.n }); if (!isValid(invFraction)) { revert InvalidFraction(); } return invFraction; } /** * @dev returns the inverse of a given fraction */ function inverse(Fraction112 memory fraction) internal pure returns (Fraction112 memory) { Fraction112 memory invFraction = Fraction112({ n: fraction.d, d: fraction.n }); if (!isValid(invFraction)) { revert InvalidFraction(); } return invFraction; } /** * @dev reduces a standard fraction to a 112-bit fraction */ function toFraction112(Fraction memory fraction) internal pure returns (Fraction112 memory) { Fraction memory truncatedFraction = MathEx.truncatedFraction(fraction, type(uint112).max); return Fraction112({ n: uint112(truncatedFraction.n), d: uint112(truncatedFraction.d) }); } /** * @dev expands a 112-bit fraction to a standard fraction */ function fromFraction112(Fraction112 memory fraction) internal pure returns (Fraction memory) { return Fraction({ n: fraction.n, d: fraction.d }); } }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { Math } from "@openzeppelin/contracts/utils/math/Math.sol"; import { Fraction, InvalidFraction } from "./Fraction.sol"; import { PPM_RESOLUTION } from "./Constants.sol"; uint256 constant ONE = 0x80000000000000000000000000000000; uint256 constant LN2 = 0x58b90bfbe8e7bcd5e4f1d9cc01f97b57; struct Uint512 { uint256 hi; // 256 most significant bits uint256 lo; // 256 least significant bits } struct Sint256 { uint256 value; bool isNeg; } /** * @dev this library provides a set of complex math operations */ library MathEx { error Overflow(); /** * @dev returns `2 ^ f` by calculating `e ^ (f * ln(2))`, where `e` is Euler's number: * - Rewrite the input as a sum of binary exponents and a single residual r, as small as possible * - The exponentiation of each binary exponent is given (pre-calculated) * - The exponentiation of r is calculated via Taylor series for e^x, where x = r * - The exponentiation of the input is calculated by multiplying the intermediate results above * - For example: e^5.521692859 = e^(4 + 1 + 0.5 + 0.021692859) = e^4 * e^1 * e^0.5 * e^0.021692859 */ function exp2(Fraction memory f) internal pure returns (Fraction memory) { uint256 x = MathEx.mulDivF(LN2, f.n, f.d); uint256 y; uint256 z; uint256 n; if (x >= (ONE << 4)) { revert Overflow(); } unchecked { z = y = x % (ONE >> 3); // get the input modulo 2^(-3) z = (z * y) / ONE; n += z * 0x10e1b3be415a0000; // add y^02 * (20! / 02!) z = (z * y) / ONE; n += z * 0x05a0913f6b1e0000; // add y^03 * (20! / 03!) z = (z * y) / ONE; n += z * 0x0168244fdac78000; // add y^04 * (20! / 04!) z = (z * y) / ONE; n += z * 0x004807432bc18000; // add y^05 * (20! / 05!) z = (z * y) / ONE; n += z * 0x000c0135dca04000; // add y^06 * (20! / 06!) z = (z * y) / ONE; n += z * 0x0001b707b1cdc000; // add y^07 * (20! / 07!) z = (z * y) / ONE; n += z * 0x000036e0f639b800; // add y^08 * (20! / 08!) z = (z * y) / ONE; n += z * 0x00000618fee9f800; // add y^09 * (20! / 09!) z = (z * y) / ONE; n += z * 0x0000009c197dcc00; // add y^10 * (20! / 10!) z = (z * y) / ONE; n += z * 0x0000000e30dce400; // add y^11 * (20! / 11!) z = (z * y) / ONE; n += z * 0x000000012ebd1300; // add y^12 * (20! / 12!) z = (z * y) / ONE; n += z * 0x0000000017499f00; // add y^13 * (20! / 13!) z = (z * y) / ONE; n += z * 0x0000000001a9d480; // add y^14 * (20! / 14!) z = (z * y) / ONE; n += z * 0x00000000001c6380; // add y^15 * (20! / 15!) z = (z * y) / ONE; n += z * 0x000000000001c638; // add y^16 * (20! / 16!) z = (z * y) / ONE; n += z * 0x0000000000001ab8; // add y^17 * (20! / 17!) z = (z * y) / ONE; n += z * 0x000000000000017c; // add y^18 * (20! / 18!) z = (z * y) / ONE; n += z * 0x0000000000000014; // add y^19 * (20! / 19!) z = (z * y) / ONE; n += z * 0x0000000000000001; // add y^20 * (20! / 20!) n = n / 0x21c3677c82b40000 + y + ONE; // divide by 20! and then add y^1 / 1! + y^0 / 0! if ((x & (ONE >> 3)) != 0) n = (n * 0x1c3d6a24ed82218787d624d3e5eba95f9) / 0x18ebef9eac820ae8682b9793ac6d1e776; // multiply by e^(2^-3) if ((x & (ONE >> 2)) != 0) n = (n * 0x18ebef9eac820ae8682b9793ac6d1e778) / 0x1368b2fc6f9609fe7aceb46aa619baed4; // multiply by e^(2^-2) if ((x & (ONE >> 1)) != 0) n = (n * 0x1368b2fc6f9609fe7aceb46aa619baed5) / 0x0bc5ab1b16779be3575bd8f0520a9f21f; // multiply by e^(2^-1) if ((x & (ONE << 0)) != 0) n = (n * 0x0bc5ab1b16779be3575bd8f0520a9f21e) / 0x0454aaa8efe072e7f6ddbab84b40a55c9; // multiply by e^(2^+0) if ((x & (ONE << 1)) != 0) n = (n * 0x0454aaa8efe072e7f6ddbab84b40a55c5) / 0x00960aadc109e7a3bf4578099615711ea; // multiply by e^(2^+1) if ((x & (ONE << 2)) != 0) n = (n * 0x00960aadc109e7a3bf4578099615711d7) / 0x0002bf84208204f5977f9a8cf01fdce3d; // multiply by e^(2^+2) if ((x & (ONE << 3)) != 0) n = (n * 0x0002bf84208204f5977f9a8cf01fdc307) / 0x0000003c6ab775dd0b95b4cbee7e65d11; // multiply by e^(2^+3) } return Fraction({ n: n, d: ONE }); } /** * @dev returns a fraction with truncated components * note that since the input value is truncated, the use of the method incurs precision loss */ function truncatedFraction(Fraction memory fraction, uint256 max) internal pure returns (Fraction memory) { uint256 scale = Math.ceilDiv(Math.max(fraction.n, fraction.d), max); Fraction memory truncated = Fraction({ n: fraction.n / scale, d: fraction.d / scale }); if (truncated.d == 0) { revert InvalidFraction(); } return truncated; } /** * @dev returns the weighted average of two fractions */ function weightedAverage( Fraction memory fraction1, Fraction memory fraction2, uint256 weight1, uint256 weight2 ) internal pure returns (Fraction memory) { return Fraction({ n: fraction1.n * fraction2.d * weight1 + fraction1.d * fraction2.n * weight2, d: fraction1.d * fraction2.d * (weight1 + weight2) }); } /** * @dev returns whether or not the deviation of an offset sample from a base sample is within a permitted range * for example, if the maximum permitted deviation is 5%, then evaluate `95% * base <= offset <= 105% * base` */ function isInRange( Fraction memory baseSample, Fraction memory offsetSample, uint32 maxDeviationPPM ) internal pure returns (bool) { Uint512 memory min = mul512(baseSample.n, offsetSample.d * (PPM_RESOLUTION - maxDeviationPPM)); Uint512 memory mid = mul512(baseSample.d, offsetSample.n * PPM_RESOLUTION); Uint512 memory max = mul512(baseSample.n, offsetSample.d * (PPM_RESOLUTION + maxDeviationPPM)); return lte512(min, mid) && lte512(mid, max); } /** * @dev returns an `Sint256` positive representation of an unsigned integer */ function toPos256(uint256 n) internal pure returns (Sint256 memory) { return Sint256({ value: n, isNeg: false }); } /** * @dev returns an `Sint256` negative representation of an unsigned integer */ function toNeg256(uint256 n) internal pure returns (Sint256 memory) { return Sint256({ value: n, isNeg: true }); } /** * @dev returns the largest integer smaller than or equal to `x * y / z` */ function mulDivF(uint256 x, uint256 y, uint256 z) internal pure returns (uint256) { Uint512 memory xy = mul512(x, y); // if `x * y < 2 ^ 256` if (xy.hi == 0) { return xy.lo / z; } // assert `x * y / z < 2 ^ 256` if (xy.hi >= z) { revert Overflow(); } uint256 m = _mulMod(x, y, z); // `m = x * y % z` Uint512 memory n = _sub512(xy, m); // `n = x * y - m` hence `n / z = floor(x * y / z)` // if `n < 2 ^ 256` if (n.hi == 0) { return n.lo / z; } uint256 p = _unsafeSub(0, z) & z; // `p` is the largest power of 2 which `z` is divisible by uint256 q = _div512(n, p); // `n` is divisible by `p` because `n` is divisible by `z` and `z` is divisible by `p` uint256 r = _inv256(z / p); // `z / p = 1 mod 2` hence `inverse(z / p) = 1 mod 2 ^ 256` return _unsafeMul(q, r); // `q * r = (n / p) * inverse(z / p) = n / z` } /** * @dev returns the smallest integer larger than or equal to `x * y / z` */ function mulDivC(uint256 x, uint256 y, uint256 z) internal pure returns (uint256) { uint256 w = mulDivF(x, y, z); if (_mulMod(x, y, z) > 0) { if (w >= type(uint256).max) { revert Overflow(); } return w + 1; } return w; } /** * @dev returns the maximum of `n1 - n2` and 0 */ function subMax0(uint256 n1, uint256 n2) internal pure returns (uint256) { return n1 > n2 ? n1 - n2 : 0; } /** * @dev returns the value of `x > y` */ function gt512(Uint512 memory x, Uint512 memory y) internal pure returns (bool) { return x.hi > y.hi || (x.hi == y.hi && x.lo > y.lo); } /** * @dev returns the value of `x < y` */ function lt512(Uint512 memory x, Uint512 memory y) internal pure returns (bool) { return x.hi < y.hi || (x.hi == y.hi && x.lo < y.lo); } /** * @dev returns the value of `x >= y` */ function gte512(Uint512 memory x, Uint512 memory y) internal pure returns (bool) { return !lt512(x, y); } /** * @dev returns the value of `x <= y` */ function lte512(Uint512 memory x, Uint512 memory y) internal pure returns (bool) { return !gt512(x, y); } /** * @dev returns the value of `x * y` */ function mul512(uint256 x, uint256 y) internal pure returns (Uint512 memory) { uint256 p = _mulModMax(x, y); uint256 q = _unsafeMul(x, y); if (p >= q) { return Uint512({ hi: p - q, lo: q }); } return Uint512({ hi: _unsafeSub(p, q) - 1, lo: q }); } /** * @dev returns the value of `x - y`, given that `x >= y` */ function _sub512(Uint512 memory x, uint256 y) private pure returns (Uint512 memory) { if (x.lo >= y) { return Uint512({ hi: x.hi, lo: x.lo - y }); } return Uint512({ hi: x.hi - 1, lo: _unsafeSub(x.lo, y) }); } /** * @dev returns the value of `x / pow2n`, given that `x` is divisible by `pow2n` */ function _div512(Uint512 memory x, uint256 pow2n) private pure returns (uint256) { uint256 pow2nInv = _unsafeAdd(_unsafeSub(0, pow2n) / pow2n, 1); // `1 << (256 - n)` return _unsafeMul(x.hi, pow2nInv) | (x.lo / pow2n); // `(x.hi << (256 - n)) | (x.lo >> n)` } /** * @dev returns the inverse of `d` modulo `2 ^ 256`, given that `d` is congruent to `1` modulo `2` */ function _inv256(uint256 d) private pure returns (uint256) { // approximate the root of `f(x) = 1 / x - d` using the newton–raphson convergence method uint256 x = 1; for (uint256 i = 0; i < 8; i++) { x = _unsafeMul(x, _unsafeSub(2, _unsafeMul(x, d))); // `x = x * (2 - x * d) mod 2 ^ 256` } return x; } /** * @dev returns `(x + y) % 2 ^ 256` */ function _unsafeAdd(uint256 x, uint256 y) private pure returns (uint256) { unchecked { return x + y; } } /** * @dev returns `(x - y) % 2 ^ 256` */ function _unsafeSub(uint256 x, uint256 y) private pure returns (uint256) { unchecked { return x - y; } } /** * @dev returns `(x * y) % 2 ^ 256` */ function _unsafeMul(uint256 x, uint256 y) private pure returns (uint256) { unchecked { return x * y; } } /** * @dev returns `x * y % (2 ^ 256 - 1)` */ function _mulModMax(uint256 x, uint256 y) private pure returns (uint256) { return mulmod(x, y, type(uint256).max); } /** * @dev returns `x * y % z` */ function _mulMod(uint256 x, uint256 y, uint256 z) private pure returns (uint256) { return mulmod(x, y, z); } }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IOwned } from "./interfaces/IOwned.sol"; import { AccessDenied } from "./Utils.sol"; /** * @dev this contract provides support and utilities for contract ownership */ abstract contract Owned is IOwned { error SameOwner(); address private _owner; address private _newOwner; /** * @dev triggered when the owner is updated */ event OwnerUpdate(address indexed prevOwner, address indexed newOwner); // solhint-disable func-name-mixedcase /** * @dev initializes the contract */ constructor() { _setOwnership(msg.sender); } // solhint-enable func-name-mixedcase // allows execution by the owner only modifier onlyOwner() { _onlyOwner(); _; } // error message binary size optimization function _onlyOwner() private view { if (msg.sender != _owner) { revert AccessDenied(); } } /** * @inheritdoc IOwned */ function owner() public view virtual returns (address) { return _owner; } /** * @inheritdoc IOwned */ function transferOwnership(address ownerCandidate) public virtual onlyOwner { if (ownerCandidate == _owner) { revert SameOwner(); } _newOwner = ownerCandidate; } /** * @inheritdoc IOwned */ function acceptOwnership() public virtual { if (msg.sender != _newOwner) { revert AccessDenied(); } _setOwnership(_newOwner); } /** * @dev returns the address of the new owner candidate */ function newOwner() external view returns (address) { return _newOwner; } /** * @dev sets the new owner internally */ function _setOwnership(address ownerCandidate) private { address prevOwner = _owner; _owner = ownerCandidate; _newOwner = address(0); emit OwnerUpdate({ prevOwner: prevOwner, newOwner: ownerCandidate }); } }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { PPM_RESOLUTION } from "./Constants.sol"; error AccessDenied(); error AlreadyExists(); error DoesNotExist(); error InvalidAddress(); error InvalidExternalAddress(); error InvalidFee(); error InvalidPool(); error InvalidPoolCollection(); error InvalidStakedBalance(); error InvalidToken(); error InvalidParam(); error NotEmpty(); error NotPayable(); error ZeroValue(); /** * @dev common utilities */ abstract contract Utils { // allows execution by the caller only modifier only(address caller) { _only(caller); _; } function _only(address caller) internal view { if (msg.sender != caller) { revert AccessDenied(); } } // verifies that a value is greater than zero modifier greaterThanZero(uint256 value) { _greaterThanZero(value); _; } // error message binary size optimization function _greaterThanZero(uint256 value) internal pure { if (value == 0) { revert ZeroValue(); } } // validates an address - currently only checks that it isn't null modifier validAddress(address addr) { _validAddress(addr); _; } // error message binary size optimization function _validAddress(address addr) internal pure { if (addr == address(0)) { revert InvalidAddress(); } } // validates an external address - currently only checks that it isn't null or this modifier validExternalAddress(address addr) { _validExternalAddress(addr); _; } // error message binary size optimization function _validExternalAddress(address addr) internal view { if (addr == address(0) || addr == address(this)) { revert InvalidExternalAddress(); } } // ensures that the fee is valid modifier validFee(uint32 fee) { _validFee(fee); _; } // error message binary size optimization function _validFee(uint32 fee) internal pure { if (fee > PPM_RESOLUTION) { revert InvalidFee(); } } }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; /** * @dev Owned interface */ interface IOwned { /** * @dev returns the address of the current owner */ function owner() external view returns (address); /** * @dev allows transferring the contract ownership * * requirements: * * - the caller must be the owner of the contract * - the new owner still needs to accept the transfer */ function transferOwnership(address ownerCandidate) external; /** * @dev used by a new owner to accept an ownership transfer */ function acceptOwnership() external; }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IVersioned } from "./IVersioned.sol"; import { IAccessControlEnumerableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/IAccessControlEnumerableUpgradeable.sol"; /** * @dev this is the common interface for upgradeable contracts */ interface IUpgradeable is IAccessControlEnumerableUpgradeable, IVersioned { }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; /** * @dev an interface for a versioned contract */ interface IVersioned { function version() external view returns (uint16); }
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IVault } from "./IVault.sol"; interface IExternalProtectionVault is IVault {}
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IVault } from "./IVault.sol"; interface IMasterVault is IVault {}
// SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.8.13; import { IUpgradeable } from "../../utility/interfaces/IUpgradeable.sol"; import { Token } from "../../token/Token.sol"; // the asset manager role is required to access all the funds bytes32 constant ROLE_ASSET_MANAGER = keccak256("ROLE_ASSET_MANAGER"); interface IVault is IUpgradeable { /** * @dev triggered when tokens have been withdrawn from the vault */ event FundsWithdrawn(Token indexed token, address indexed caller, address indexed target, uint256 amount); /** * @dev triggered when tokens have been burned from the vault */ event FundsBurned(Token indexed token, address indexed caller, uint256 amount); /** * @dev tells whether the vault accepts native token deposits */ function isPayable() external view returns (bool); /** * @dev withdraws funds held by the contract and sends them to an account */ function withdrawFunds( Token token, address payable target, uint256 amount ) external; /** * @dev burns funds held by the contract */ function burn(Token token, uint256 amount) external; }
{ "evmVersion": "london", "libraries": {}, "metadata": { "bytecodeHash": "none", "useLiteralContent": true }, "optimizer": { "enabled": true, "runs": 200 }, "remappings": [], "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"contract IBancorNetwork","name":"initNetwork","type":"address"},{"internalType":"contract IERC20","name":"initBNT","type":"address"},{"internalType":"contract INetworkSettings","name":"initNetworkSettings","type":"address"},{"internalType":"contract IMasterVault","name":"initMasterVault","type":"address"},{"internalType":"contract IBNTPool","name":"initBNTPool","type":"address"},{"internalType":"contract IExternalProtectionVault","name":"initExternalProtectionVault","type":"address"},{"internalType":"contract IPoolTokenFactory","name":"initPoolTokenFactory","type":"address"},{"internalType":"contract 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Token","name":"pool","type":"address"}],"name":"isPoolStable","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract Token","name":"pool","type":"address"}],"name":"isPoolValid","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract Token","name":"pool","type":"address"},{"components":[{"internalType":"contract IPoolToken","name":"poolToken","type":"address"},{"internalType":"uint32","name":"tradingFeePPM","type":"uint32"},{"internalType":"bool","name":"tradingEnabled","type":"bool"},{"internalType":"bool","name":"depositingEnabled","type":"bool"},{"components":[{"internalType":"uint32","name":"blockNumber","type":"uint32"},{"components":[{"internalType":"uint112","name":"n","type":"uint112"},{"internalType":"uint112","name":"d","type":"uint112"}],"internalType":"struct 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IPoolCollection","name":"targetPoolCollection","type":"address"}],"name":"migratePoolOut","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"networkFeePPM","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"newOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract Token","name":"pool","type":"address"},{"internalType":"uint256","name":"feeAmount","type":"uint256"}],"name":"onFeesCollected","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"poolCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract 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Token","name":"targetToken","type":"address"},{"internalType":"uint256","name":"targetAmount","type":"uint256"}],"name":"tradeInputAndFeeByTargetAmount","outputs":[{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"tradingFeeAmount","type":"uint256"},{"internalType":"uint256","name":"networkFeeAmount","type":"uint256"}],"internalType":"struct TradeAmountAndFee","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract Token","name":"sourceToken","type":"address"},{"internalType":"contract Token","name":"targetToken","type":"address"},{"internalType":"uint256","name":"sourceAmount","type":"uint256"}],"name":"tradeOutputAndFeeBySourceAmount","outputs":[{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"tradingFeeAmount","type":"uint256"},{"internalType":"uint256","name":"networkFeeAmount","type":"uint256"}],"internalType":"struct TradeAmountAndFee","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract Token","name":"pool","type":"address"}],"name":"tradingEnabled","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract 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Token","name":"pool","type":"address"}],"name":"updateTradingLiquidity","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"contextId","type":"bytes32"},{"internalType":"address","name":"provider","type":"address"},{"internalType":"contract Token","name":"pool","type":"address"},{"internalType":"uint256","name":"poolTokenAmount","type":"uint256"},{"internalType":"uint256","name":"baseTokenAmount","type":"uint256"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract 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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : initNetwork (address): 0xeEF417e1D5CC832e619ae18D2F140De2999dD4fB
Arg [1] : initBNT (address): 0x1F573D6Fb3F13d689FF844B4cE37794d79a7FF1C
Arg [2] : initNetworkSettings (address): 0x83E1814ba31F7ea95D216204BB45FE75Ce09b14F
Arg [3] : initMasterVault (address): 0x649765821D9f64198c905eC0B2B037a4a52Bc373
Arg [4] : initBNTPool (address): 0x02651E355D26f3506C1E644bA393FDD9Ac95EaCa
Arg [5] : initExternalProtectionVault (address): 0xFd31662b3d54eddE9B6Bdd32c9c27C8E292cAD57
Arg [6] : initPoolTokenFactory (address): 0x9E912953DB31fE933BDa43374208E967058D9d5F
Arg [7] : initPoolMigrator (address): 0x97CeC0F2D355BF073619A5093F989709caE4a191
-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000eef417e1d5cc832e619ae18d2f140de2999dd4fb
Arg [1] : 0000000000000000000000001f573d6fb3f13d689ff844b4ce37794d79a7ff1c
Arg [2] : 00000000000000000000000083e1814ba31f7ea95d216204bb45fe75ce09b14f
Arg [3] : 000000000000000000000000649765821d9f64198c905ec0b2b037a4a52bc373
Arg [4] : 00000000000000000000000002651e355d26f3506c1e644ba393fdd9ac95eaca
Arg [5] : 000000000000000000000000fd31662b3d54edde9b6bdd32c9c27c8e292cad57
Arg [6] : 0000000000000000000000009e912953db31fe933bda43374208e967058d9d5f
Arg [7] : 00000000000000000000000097cec0f2d355bf073619a5093f989709cae4a191
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Multichain Portfolio | 26 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.