Address Details
contract
0x20fdb939Fd1B71c14c0950Df25dFc2A9DE3C6fb9
- Contract Name
- Broker
- Creator
- 0xfcf982–bb718e at 0x6bced4–a7e017
- Balance
- 0 CELO
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
- Tokens
-
Fetching tokens...
- Transactions
- 0 Transactions
- Transfers
- 0 Transfers
- Gas Used
- Fetching gas used...
- Last Balance Update
- 14465696
This contract has been verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- Broker
- Optimization enabled
- true
- Compiler version
- v0.5.17+commit.d19bba13
- Optimization runs
- 10000
- EVM Version
- istanbul
- Verified at
- 2022-12-05T20:13:54.446029Z
contracts/Broker.sol
pragma solidity ^0.5.13; pragma experimental ABIEncoderV2; import { Ownable } from "openzeppelin-solidity/contracts/ownership/Ownable.sol"; import { IExchangeProvider } from "./interfaces/IExchangeProvider.sol"; import { IBroker } from "./interfaces/IBroker.sol"; import { IBrokerAdmin } from "./interfaces/IBrokerAdmin.sol"; import { IReserve } from "./interfaces/IReserve.sol"; import { IStableToken } from "./interfaces/IStableToken.sol"; import { IERC20Metadata } from "./common/interfaces/IERC20Metadata.sol"; import { Initializable } from "./common/Initializable.sol"; import { TradingLimits } from "./common/TradingLimits.sol"; /** * @title Broker * @notice The broker executes swaps and keeps track of spending limits per pair. */ contract Broker is IBroker, IBrokerAdmin, Initializable, Ownable { using TradingLimits for TradingLimits.State; using TradingLimits for TradingLimits.Config; /* ==================== State Variables ==================== */ address[] public exchangeProviders; mapping(address => bool) public isExchangeProvider; mapping(bytes32 => TradingLimits.State) public tradingLimitsState; mapping(bytes32 => TradingLimits.Config) public tradingLimitsConfig; // Address of the reserve. IReserve public reserve; uint256 private constant MAX_INT256 = uint256(-1) / 2; /* ==================== Constructor ==================== */ /** * @notice Sets initialized == true on implementation contracts. * @param test Set to true to skip implementation initialization. */ constructor(bool test) public Initializable(test) {} /** * @notice Allows the contract to be upgradable via the proxy. * @param _exchangeProviders The addresses of the ExchangeProvider contracts. * @param _reserve The address of the Reserve contract. */ function initialize(address[] calldata _exchangeProviders, address _reserve) external initializer { _transferOwnership(msg.sender); for (uint256 i = 0; i < _exchangeProviders.length; i++) { addExchangeProvider(_exchangeProviders[i]); } setReserve(_reserve); } /* ==================== Mutative Functions ==================== */ /** * @notice Add an exchange provider to the list of providers. * @param exchangeProvider The address of the exchange provider to add. * @return index The index of the newly added specified exchange provider. */ function addExchangeProvider(address exchangeProvider) public onlyOwner returns (uint256 index) { require(!isExchangeProvider[exchangeProvider], "ExchangeProvider already exists in the list"); require(exchangeProvider != address(0), "ExchangeProvider address can't be 0"); exchangeProviders.push(exchangeProvider); isExchangeProvider[exchangeProvider] = true; emit ExchangeProviderAdded(exchangeProvider); index = exchangeProviders.length - 1; } /** * @notice Remove an exchange provider from the list of providers. * @param exchangeProvider The address of the exchange provider to remove. * @param index The index of the exchange provider being removed. */ function removeExchangeProvider(address exchangeProvider, uint256 index) public onlyOwner { require(exchangeProviders[index] == exchangeProvider, "index doesn't match provider"); exchangeProviders[index] = exchangeProviders[exchangeProviders.length - 1]; exchangeProviders.pop(); delete isExchangeProvider[exchangeProvider]; emit ExchangeProviderRemoved(exchangeProvider); } /** * @notice Set the Mento reserve address. * @param _reserve The Mento reserve address. */ function setReserve(address _reserve) public onlyOwner { require(_reserve != address(0), "Reserve address must be set"); emit ReserveSet(_reserve, address(reserve)); reserve = IReserve(_reserve); } /** * @notice Calculate the amount of tokenIn to be sold for a given amountOut of tokenOut * @param exchangeProvider the address of the exchange manager for the pair * @param exchangeId The id of the exchange to use * @param tokenIn The token to be sold * @param tokenOut The token to be bought * @param amountOut The amount of tokenOut to be bought * @return amountIn The amount of tokenIn to be sold */ function getAmountIn( address exchangeProvider, bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountOut ) external returns (uint256 amountIn) { require(isExchangeProvider[exchangeProvider], "ExchangeProvider does not exist"); amountIn = IExchangeProvider(exchangeProvider).getAmountIn(exchangeId, tokenIn, tokenOut, amountOut); } /** * @notice Calculate the amount of tokenOut to be bought for a given amount of tokenIn to be sold * @param exchangeProvider the address of the exchange manager for the pair * @param exchangeId The id of the exchange to use * @param tokenIn The token to be sold * @param tokenOut The token to be bought * @param amountIn The amount of tokenIn to be sold * @return amountOut The amount of tokenOut to be bought */ function getAmountOut( address exchangeProvider, bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountIn ) external returns (uint256 amountOut) { require(isExchangeProvider[exchangeProvider], "ExchangeProvider does not exist"); amountOut = IExchangeProvider(exchangeProvider).getAmountOut(exchangeId, tokenIn, tokenOut, amountIn); } /** * @notice Execute a token swap with fixed amountIn. * @param exchangeProvider the address of the exchange provider for the pair. * @param exchangeId The id of the exchange to use. * @param tokenIn The token to be sold. * @param tokenOut The token to be bought. * @param amountIn The amount of tokenIn to be sold. * @param amountOutMin Minimum amountOut to be received - controls slippage. * @return amountOut The amount of tokenOut to be bought. */ function swapIn( address exchangeProvider, bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountIn, uint256 amountOutMin ) external returns (uint256 amountOut) { require(isExchangeProvider[exchangeProvider], "ExchangeProvider does not exist"); amountOut = IExchangeProvider(exchangeProvider).swapIn(exchangeId, tokenIn, tokenOut, amountIn); require(amountOut >= amountOutMin, "amountOutMin not met"); guardTradingLimits(exchangeId, tokenIn, amountIn, tokenOut, amountOut); transferIn(msg.sender, tokenIn, amountIn); transferOut(msg.sender, tokenOut, amountOut); emit Swap(exchangeProvider, exchangeId, msg.sender, tokenIn, tokenOut, amountIn, amountOut); } /** * @notice Execute a token swap with fixed amountOut. * @param exchangeProvider the address of the exchange provider for the pair. * @param exchangeId The id of the exchange to use. * @param tokenIn The token to be sold. * @param tokenOut The token to be bought. * @param amountOut The amount of tokenOut to be bought. * @param amountInMax Maximum amount of tokenIn that can be traded. * @return amountIn The amount of tokenIn to be sold. */ function swapOut( address exchangeProvider, bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountOut, uint256 amountInMax ) external returns (uint256 amountIn) { require(isExchangeProvider[exchangeProvider], "ExchangeProvider does not exist"); amountIn = IExchangeProvider(exchangeProvider).swapOut(exchangeId, tokenIn, tokenOut, amountOut); require(amountIn <= amountInMax, "amountInMax exceeded"); guardTradingLimits(exchangeId, tokenIn, amountIn, tokenOut, amountOut); transferIn(msg.sender, tokenIn, amountIn); transferOut(msg.sender, tokenOut, amountOut); emit Swap(exchangeProvider, exchangeId, msg.sender, tokenIn, tokenOut, amountIn, amountOut); } /** * @notice Permissionless way to burn stables from msg.sender directly. * @param token The token getting burned. * @param amount The amount of the token getting burned. * @return True if transaction succeeds. */ function burnStableTokens(address token, uint256 amount) public returns (bool) { require(reserve.isStableAsset(token), "Token must be a reserve stable asset"); IERC20Metadata(token).transferFrom(msg.sender, address(this), amount); IStableToken(token).burn(amount); return true; } /** * @notice Configure trading limits for an (exchangeId, token) touple. * @dev Will revert if the configuration is not valid according to the * TradingLimits library. * Resets existing state according to the TradingLimits library logic. * Can only be called by owner. * @param exchangeId the exchangeId to target. * @param token the token to target. * @param config the new trading limits config. */ function configureTradingLimit( bytes32 exchangeId, address token, TradingLimits.Config memory config ) public onlyOwner { config.validate(); bytes32 limitId = exchangeId ^ bytes32(uint256(uint160(token))); tradingLimitsConfig[limitId] = config; tradingLimitsState[limitId] = tradingLimitsState[limitId].reset(config); } /* ==================== Private Functions ==================== */ /** * @notice Transfer a specified Mento asset to the given address. * If the specified asset is a stable asset it will be minted directly to the address. If * the asset is a collateral asset it will be transferred from the reserve to the given address. * @param to The address receiving the asset. * @param token The asset to transfer. * @param amount The amount of `token` to be transferred. */ function transferOut( address payable to, address token, uint256 amount ) internal { if (reserve.isStableAsset(token)) { IStableToken(token).mint(to, amount); } else if (reserve.isCollateralAsset(token)) { reserve.transferCollateralAsset(token, to, amount); } else { revert("Token must be stable or collateral assert"); } } /** * @notice Transfer a specified Mento asset into the reserve or the broker. * If the specified asset is a stable asset it will be transfered to the broker * and burned. If the asset is a collateral asset it will be transferred to the reserve. * @param from The address to transfer the asset from. * @param token The asset to transfer. * @param amount The amount of `token` to be transferred. */ function transferIn( address payable from, address token, uint256 amount ) internal { if (reserve.isStableAsset(token)) { IERC20Metadata(token).transferFrom(from, address(this), amount); IStableToken(token).burn(amount); } else if (reserve.isCollateralAsset(token)) { IERC20Metadata(token).transferFrom(from, address(reserve), amount); } else { revert("Token must be stable or collateral assert"); } } /** * @notice Verify trading limits for a trade in both directions. * @dev Reverts if the trading limits are met for outflow or inflow. * @param exchangeId the ID of the exchange being used. * @param _tokenIn the address of the token flowing in. * @param amountIn the amount of token flowing in. * @param _tokenOut the address of the token flowing out. * @param amountOut the amount of token flowing out. */ function guardTradingLimits( bytes32 exchangeId, address _tokenIn, uint256 amountIn, address _tokenOut, uint256 amountOut ) internal { bytes32 tokenIn = bytes32(uint256(uint160(_tokenIn))); bytes32 tokenOut = bytes32(uint256(uint160(_tokenOut))); require(amountIn <= uint256(MAX_INT256), "amountIn too large"); require(amountOut <= uint256(MAX_INT256), "amountOut too large"); guardTradingLimit(exchangeId ^ tokenIn, int256(amountIn), _tokenIn); guardTradingLimit(exchangeId ^ tokenOut, -1 * int256(amountOut), _tokenOut); } /** * @notice Updates and verifies a trading limit if it's configured. * @dev Will revert if the trading limit is exceeded by this trade. * @param tradingLimitId the ID of the trading limit associated with the token * @param deltaFlow the deltaflow of this token, negative for outflow, positive for inflow. * @param token the address of the token, used to lookup decimals. */ function guardTradingLimit( bytes32 tradingLimitId, int256 deltaFlow, address token ) internal { TradingLimits.Config memory tradingLimitConfig = tradingLimitsConfig[tradingLimitId]; if (tradingLimitConfig.flags > 0) { TradingLimits.State memory tradingLimitState = tradingLimitsState[tradingLimitId]; tradingLimitState = tradingLimitState.update(tradingLimitConfig, deltaFlow, IERC20Metadata(token).decimals()); tradingLimitState.verify(tradingLimitConfig); tradingLimitsState[tradingLimitId] = tradingLimitState; } } /* ==================== View Functions ==================== */ /** * @notice Get the list of registered exchange providers. * @dev This can be used by UI or clients to discover all pairs. * @return exchangeProviders the addresses of all exchange providers. */ function getExchangeProviders() external view returns (address[] memory) { return exchangeProviders; } }
/lib/openzeppelin-contracts/contracts/ownership/Ownable.sol
pragma solidity ^0.5.0; import "../GSN/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor () internal { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(isOwner(), "Ownable: caller is not the owner"); _; } /** * @dev Returns true if the caller is the current owner. */ function isOwner() public view returns (bool) { return _msgSender() == _owner; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public onlyOwner { emit OwnershipTransferred(_owner, address(0)); _owner = address(0); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public onlyOwner { _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). */ function _transferOwnership(address newOwner) internal { require(newOwner != address(0), "Ownable: new owner is the zero address"); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } }
/lib/openzeppelin-contracts/contracts/GSN/Context.sol
pragma solidity ^0.5.0; /* * @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 GSN 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. */ contract Context { // Empty internal constructor, to prevent people from mistakenly deploying // an instance of this contract, which should be used via inheritance. constructor () internal { } // solhint-disable-previous-line no-empty-blocks function _msgSender() internal view returns (address payable) { return msg.sender; } function _msgData() internal view returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
/contracts/interfaces/IStableToken.sol
pragma solidity ^0.5.13; /** * @title This interface describes the functions specific to Celo Stable Tokens, and in the * absence of interface inheritance is intended as a companion to IERC20.sol and ICeloToken.sol. */ interface IStableToken { function mint(address, uint256) external returns (bool); function burn(uint256) external returns (bool); function setInflationParameters(uint256, uint256) external; function valueToUnits(uint256) external view returns (uint256); function unitsToValue(uint256) external view returns (uint256); function getInflationParameters() external view returns ( uint256, uint256, uint256, uint256 ); function getExchangeRegistryId() external view returns (bytes32); // NOTE: duplicated with IERC20.sol, remove once interface inheritance is supported. function balanceOf(address) external view returns (uint256); }
/contracts/interfaces/IReserve.sol
pragma solidity ^0.5.13; interface IReserve { function setTobinTaxStalenessThreshold(uint256) external; function addToken(address) external returns (bool); function removeToken(address, uint256) external returns (bool); function transferGold(address payable, uint256) external returns (bool); function transferExchangeGold(address payable, uint256) external returns (bool); function transferCollateralAsset( address collateralAsset, address payable to, uint256 value ) external returns (bool); function getReserveGoldBalance() external view returns (uint256); function getUnfrozenReserveGoldBalance() external view returns (uint256); function getOrComputeTobinTax() external returns (uint256, uint256); function getTokens() external view returns (address[] memory); function getReserveRatio() external view returns (uint256); function addExchangeSpender(address) external; function removeExchangeSpender(address, uint256) external; function addSpender(address) external; function removeSpender(address) external; function isStableAsset(address) external view returns (bool); function isCollateralAsset(address) external view returns (bool); function getDailySpendingRatioForCollateralAsset(address collateralAsset) external view returns (uint256); function isExchangeSpender(address exchange) external view returns (bool); function addCollateralAsset(address asset) external returns (bool); }
/contracts/interfaces/IExchangeProvider.sol
// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity ^0.5.13; pragma experimental ABIEncoderV2; /** * @title ExchangeProvider interface * @notice The IExchangeProvider interface is the interface that the Broker uses * to communicate with different exchange manager implementations like the BiPoolManager */ interface IExchangeProvider { /** * @notice Exchange - a struct that's used only by UIs (frontends/CLIs) * in order to discover what asset swaps are possible within an * exchange provider. * It's up to the specific exchange provider to convert its internal * representation to this universal struct. This conversion should * only happen in view calls used for discovery. * @param exchangeId The ID of the exchange, used to initiate swaps or get quotes. * @param assets An array of addresses of ERC20 tokens that can be swapped. */ struct Exchange { bytes32 exchangeId; address[] assets; } /** * @notice Get all exchanges supported by the ExchangeProvider. * @return exchanges An array of Exchange structs. */ function getExchanges() external view returns (Exchange[] memory exchanges); /** * @notice Execute a token swap with fixed amountIn * @param exchangeId The id of the exchange to use * @param tokenIn The token to be sold * @param tokenOut The token to be bought * @param amountIn The amount of tokenIn to be sold * @return amountOut The amount of tokenOut to be bought */ function swapIn( bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountIn ) external returns (uint256 amountOut); /** * @notice Execute a token swap with fixed amountOut * @param exchangeId The id of the exchange to use * @param tokenIn The token to be sold * @param tokenOut The token to be bought * @param amountOut The amount of tokenOut to be bought * @return amountIn The amount of tokenIn to be sold */ function swapOut( bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountOut ) external returns (uint256 amountIn); /** * @notice Calculate amountOut of tokenOut received for a given amountIn of tokenIn * @param exchangeId The id of the exchange to use * @param tokenIn The token to be sold * @param tokenOut The token to be bought * @param amountIn The amount of tokenIn to be sold * @return amountOut The amount of tokenOut to be bought */ function getAmountOut( bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountIn ) external view returns (uint256 amountOut); /** * @notice Calculate amountIn of tokenIn needed for a given amountOut of tokenOut * @param exchangeId The id of the exchange to use * @param tokenIn The token to be sold * @param tokenOut The token to be bought * @param amountOut The amount of tokenOut to be bought * @return amountIn The amount of tokenIn to be sold */ function getAmountIn( bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountOut ) external view returns (uint256 amountIn); }
/contracts/interfaces/IBrokerAdmin.sol
// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity ^0.5.13; /* * @title Broker Admin Interface * @notice Contains admin functions to configure the broker that * should be only callable by the owner. */ interface IBrokerAdmin { /** * @notice Emitted when an ExchangeProvider is added. * @param exchangeProvider The address of the ExchangeProvider. */ event ExchangeProviderAdded(address indexed exchangeProvider); /** * @notice Emitted when an ExchangeProvider is removed. * @param exchangeProvider The address of the ExchangeProvider. */ event ExchangeProviderRemoved(address indexed exchangeProvider); /** * @notice Emitted when the reserve is updated. * @param newAddress The new address. * @param prevAddress The previous address. */ event ReserveSet(address indexed newAddress, address indexed prevAddress); /** * @notice Remove an ExchangeProvider at a specified index. * @param exchangeProvider The address of the ExchangeProvider to remove. * @param index The index in the exchange providers array. */ function removeExchangeProvider(address exchangeProvider, uint256 index) external; /** * @notice Add an ExchangeProvider. * @param exchangeProvider The address of the ExchangeProvider to add. * @return index The index where the ExchangeProvider was inserted. */ function addExchangeProvider(address exchangeProvider) external returns (uint256 index); /** * @notice Set the Mento reserve address. * @param reserve The Mento reserve address. */ function setReserve(address reserve) external; }
/contracts/interfaces/IBroker.sol
// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity ^0.5.13; /* * @title Broker Interface for trader functions * @notice The broker is responsible for executing swaps and keeping track of trading limits. */ interface IBroker { /** * @notice Emitted when a swap occurs. * @param exchangeProvider The exchange provider used. * @param exchangeId The id of the exchange used. * @param trader The user that initiated the swap. * @param tokenIn The address of the token that was sold. * @param tokenOut The address of the token that was bought. * @param amountIn The amount of token sold. * @param amountOut The amount of token bought. */ event Swap( address exchangeProvider, bytes32 indexed exchangeId, address indexed trader, address indexed tokenIn, address tokenOut, uint256 amountIn, uint256 amountOut ); /** * @notice Execute a token swap with fixed amountIn. * @param exchangeProvider the address of the exchange provider for the pair. * @param exchangeId The id of the exchange to use. * @param tokenIn The token to be sold. * @param tokenOut The token to be bought. * @param amountIn The amount of tokenIn to be sold. * @param amountOutMin Minimum amountOut to be received - controls slippage. * @return amountOut The amount of tokenOut to be bought. */ function swapIn( address exchangeProvider, bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountIn, uint256 amountOutMin ) external returns (uint256 amountOut); /** * @notice Execute a token swap with fixed amountOut. * @param exchangeProvider the address of the exchange provider for the pair. * @param exchangeId The id of the exchange to use. * @param tokenIn The token to be sold. * @param tokenOut The token to be bought. * @param amountOut The amount of tokenOut to be bought. * @param amountInMax Maximum amount of tokenIn that can be traded. * @return amountIn The amount of tokenIn to be sold. */ function swapOut( address exchangeProvider, bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountOut, uint256 amountInMax ) external returns (uint256 amountIn); /** * @notice Calculate amountOut of tokenOut received for a given amountIn of tokenIn. * @param exchangeProvider the address of the exchange provider for the pair. * @param exchangeId The id of the exchange to use. * @param tokenIn The token to be sold. * @param tokenOut The token to be bought. * @param amountIn The amount of tokenIn to be sold. * @return amountOut The amount of tokenOut to be bought. */ function getAmountOut( address exchangeProvider, bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountIn ) external returns (uint256 amountOut); /** * @notice Calculate amountIn of tokenIn needed for a given amountOut of tokenOut. * @param exchangeProvider the address of the exchange provider for the pair. * @param exchangeId The id of the exchange to use. * @param tokenIn The token to be sold. * @param tokenOut The token to be bought. * @param amountOut The amount of tokenOut to be bought. * @return amountIn The amount of tokenIn to be sold. */ function getAmountIn( address exchangeProvider, bytes32 exchangeId, address tokenIn, address tokenOut, uint256 amountOut ) external returns (uint256 amountIn); /** * @notice Get the list of registered exchange providers. * @dev This can be used by UI or clients to discover all pairs. * @return exchangeProviders the addresses of all exchange providers. */ function getExchangeProviders() external view returns (address[] memory exchangeProviders); }
/contracts/common/interfaces/IERC20Metadata.sol
pragma solidity ^0.5.13; interface IERC20Metadata { /** * @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); /** * @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 `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, 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); }
/contracts/common/TradingLimits.sol
pragma solidity ^0.5.13; pragma experimental ABIEncoderV2; /** * @title TradingLimits * @author Mento Team * @notice This library provides data structs and utility functions for * defining and verifying trading limits on the netflow of an asset. * There are three limits that can be enabled: * - L0: A timewindow based limit, verifies that: * -1 * limit0 <= netflow0 <= limit0, * for a netflow0 that resets every timespan0 seconds. * - L1: A timewindow based limit, verifies that: * -1 * limit1 <= netflow1 <= limit1, * for a netflow1 that resets every timespan1 second. * - LG: A global (or lifetime) limit that ensures that: * -1 * limitGlobal <= netflowGlobal <= limitGlobal, * for a netflowGlobal that doesn't reset until the * limit is disabled. * @dev All contained functions are pure or view and marked internal to * be inlined on consuming contracts at compile time for gas efficiency. * Both State and Config structs are designed to be packed in one * storage slot each. * In order to pack both the state and config into one slot each, * some assumptions are made: * 1. limit{0,1,Global} and netflow{0,1,Global} are recorded with * ZERO decimals precision to fit in an int48. * Any subunit delta in netflow will be rounded up to one unit. * 2. netflow{0,1,Global} have to fit in int48, thus have to fit in the range: * -140_737_488_355_328 to 140_737_488_355_328, which can cover most * tokens of interest, but will break down for tokens which trade * in large unit values. * 3. timespan{0,1} and lastUpdated{0,1} have to fit in int32 therefore * the timestamps will overflow sometime in the year 2102. * * The library ensures that netflow0 and netflow1 are reset during * the update phase, but does not control how the full State gets * updated if the Config changes, this is left to the library consumer. */ library TradingLimits { uint8 private constant L0 = 1; // 0b001 Limit0 uint8 private constant L1 = 2; // 0b010 Limit1 uint8 private constant LG = 4; // 0b100 LimitGlobal int48 private constant MAX_INT48 = int48(uint48(-1) / 2); struct State { uint32 lastUpdated0; uint32 lastUpdated1; int48 netflow0; int48 netflow1; int48 netflowGlobal; } struct Config { uint32 timestep0; uint32 timestep1; int48 limit0; int48 limit1; int48 limitGlobal; uint8 flags; } /** * @notice Validate a trading limit configuration. * @dev Reverts if the configuration is malformed. * @param self the Config struct to check. */ function validate(Config memory self) internal pure { require(self.flags & L1 == 0 || self.flags & L0 != 0, "L1 without L0 not allowed"); require(self.flags & L0 == 0 || self.timestep0 > 0, "timestep0 can't be zero if active"); require(self.flags & L1 == 0 || self.timestep1 > 0, "timestep1 can't be zero if active"); } /** * @notice Verify a trading limit State with a provided Config. * @dev Reverts if the limits are exceeded. * @param self the trading limit State to check. * @param config the trading limit Config to check against. */ function verify(State memory self, Config memory config) internal pure { if ((config.flags & L0) > 0 && (-1 * config.limit0 > self.netflow0 || self.netflow0 > config.limit0)) { revert("L0 Exceeded"); } if ((config.flags & L1) > 0 && (-1 * config.limit1 > self.netflow1 || self.netflow1 > config.limit1)) { revert("L1 Exceeded"); } if ( (config.flags & LG) > 0 && (-1 * config.limitGlobal > self.netflowGlobal || self.netflowGlobal > config.limitGlobal) ) { revert("LG Exceeded"); } } /** * @notice Reset an existing state with a new config. * It keps netflows of enabled limits and resets when disabled. * It resets all timestamp checkpoints to reset time-window limits * on next swap. * @param self the trading limit state to reset. * @param config the updated config to reset against. * @return the reset state. */ function reset(State memory self, Config memory config) internal pure returns (State memory) { // Ensure the next swap will reset the trading limits windows. self.lastUpdated0 = 0; self.lastUpdated1 = 0; if (config.flags & L0 == 0) { self.netflow0 = 0; } if (config.flags & L1 == 0) { self.netflow1 = 0; } if (config.flags & LG == 0) { self.netflowGlobal = 0; } return self; } /** * @notice Updates a trading limit State in the context of a Config with the deltaFlow provided. * @dev Reverts if the values provided cause overflows. * @param self the trading limit State to update. * @param config the trading limit Config for the provided State. * @param _deltaFlow the delta flow to add to the netflow. * @param decimals the number of decimals the _deltaFlow is denominated in. * @return State the updated state. */ function update( State memory self, Config memory config, int256 _deltaFlow, uint8 decimals ) internal view returns (State memory) { int256 _deltaFlowUnits = _deltaFlow / int256((10**uint256(decimals))); require(_deltaFlowUnits <= MAX_INT48, "dFlow too large"); int48 deltaFlowUnits = _deltaFlowUnits == 0 ? 1 : int48(_deltaFlowUnits); if (config.flags & L0 > 0) { if (block.timestamp > self.lastUpdated0 + config.timestep0) { self.netflow0 = 0; self.lastUpdated0 = uint32(block.timestamp); } self.netflow0 = safeINT48Add(self.netflow0, deltaFlowUnits); if (config.flags & L1 > 0) { if (block.timestamp > self.lastUpdated1 + config.timestep1) { self.netflow1 = 0; self.lastUpdated1 = uint32(block.timestamp); } self.netflow1 = safeINT48Add(self.netflow1, deltaFlowUnits); } } if (config.flags & LG > 0) { self.netflowGlobal = safeINT48Add(self.netflowGlobal, deltaFlowUnits); } return self; } /** * @notice Safe add two int48s. * @dev Reverts if addition causes over/underflow. * @param a number to add. * @param b number to add. * @return int48 result of addition. */ function safeINT48Add(int48 a, int48 b) internal pure returns (int48) { int256 c = int256(a) + int256(b); require(c >= -1 * MAX_INT48 && c <= MAX_INT48, "int48 addition overflow"); return int48(c); } }
/contracts/common/Initializable.sol
pragma solidity ^0.5.13; contract Initializable { bool public initialized; constructor(bool testingDeployment) public { if (!testingDeployment) { initialized = true; } } modifier initializer() { require(!initialized, "contract already initialized"); initialized = true; _; } }
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[{"type":"bool","name":"test","internalType":"bool"}]},{"type":"event","name":"ExchangeProviderAdded","inputs":[{"type":"address","name":"exchangeProvider","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"ExchangeProviderRemoved","inputs":[{"type":"address","name":"exchangeProvider","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"ReserveSet","inputs":[{"type":"address","name":"newAddress","internalType":"address","indexed":true},{"type":"address","name":"prevAddress","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Swap","inputs":[{"type":"address","name":"exchangeProvider","internalType":"address","indexed":false},{"type":"bytes32","name":"exchangeId","internalType":"bytes32","indexed":true},{"type":"address","name":"trader","internalType":"address","indexed":true},{"type":"address","name":"tokenIn","internalType":"address","indexed":true},{"type":"address","name":"tokenOut","internalType":"address","indexed":false},{"type":"uint256","name":"amountIn","internalType":"uint256","indexed":false},{"type":"uint256","name":"amountOut","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"uint256","name":"index","internalType":"uint256"}],"name":"addExchangeProvider","inputs":[{"type":"address","name":"exchangeProvider","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"burnStableTokens","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"configureTradingLimit","inputs":[{"type":"bytes32","name":"exchangeId","internalType":"bytes32"},{"type":"address","name":"token","internalType":"address"},{"type":"tuple","name":"config","internalType":"struct TradingLimits.Config","components":[{"type":"uint32","name":"timestep0","internalType":"uint32"},{"type":"uint32","name":"timestep1","internalType":"uint32"},{"type":"int48","name":"limit0","internalType":"int48"},{"type":"int48","name":"limit1","internalType":"int48"},{"type":"int48","name":"limitGlobal","internalType":"int48"},{"type":"uint8","name":"flags","internalType":"uint8"}]}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"exchangeProviders","inputs":[{"type":"uint256","name":"","internalType":"uint256"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"}],"name":"getAmountIn","inputs":[{"type":"address","name":"exchangeProvider","internalType":"address"},{"type":"bytes32","name":"exchangeId","internalType":"bytes32"},{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"amountOut","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"}],"name":"getAmountOut","inputs":[{"type":"address","name":"exchangeProvider","internalType":"address"},{"type":"bytes32","name":"exchangeId","internalType":"bytes32"},{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"amountIn","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address[]","name":"","internalType":"address[]"}],"name":"getExchangeProviders","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"initialize","inputs":[{"type":"address[]","name":"_exchangeProviders","internalType":"address[]"},{"type":"address","name":"_reserve","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"initialized","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isExchangeProvider","inputs":[{"type":"address","name":"","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isOwner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"removeExchangeProvider","inputs":[{"type":"address","name":"exchangeProvider","internalType":"address"},{"type":"uint256","name":"index","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"renounceOwnership","inputs":[],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract IReserve"}],"name":"reserve","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setReserve","inputs":[{"type":"address","name":"_reserve","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"}],"name":"swapIn","inputs":[{"type":"address","name":"exchangeProvider","internalType":"address"},{"type":"bytes32","name":"exchangeId","internalType":"bytes32"},{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"}],"name":"swapOut","inputs":[{"type":"address","name":"exchangeProvider","internalType":"address"},{"type":"bytes32","name":"exchangeId","internalType":"bytes32"},{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"uint256","name":"amountInMax","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint32","name":"timestep0","internalType":"uint32"},{"type":"uint32","name":"timestep1","internalType":"uint32"},{"type":"int48","name":"limit0","internalType":"int48"},{"type":"int48","name":"limit1","internalType":"int48"},{"type":"int48","name":"limitGlobal","internalType":"int48"},{"type":"uint8","name":"flags","internalType":"uint8"}],"name":"tradingLimitsConfig","inputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint32","name":"lastUpdated0","internalType":"uint32"},{"type":"uint32","name":"lastUpdated1","internalType":"uint32"},{"type":"int48","name":"netflow0","internalType":"int48"},{"type":"int48","name":"netflow1","internalType":"int48"},{"type":"int48","name":"netflowGlobal","internalType":"int48"}],"name":"tradingLimitsState","inputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}],"constant":false}]
Contract Creation Code
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