Contract Overview
Contract Name:
IoDexFactory
Compiler Version
v0.6.12+commit.27d51765
// SPDX-License-Identifier: MIT pragma solidity ^0.6.12; interface IIoDexERC20 { event Approval(address indexed owner, address indexed spender, uint value); event Transfer(address indexed from, address indexed to, uint value); function name() external pure returns (string memory); function symbol() external pure returns (string memory); function decimals() external pure returns (uint8); function totalSupply() external view returns (uint); function balanceOf(address owner) external view returns (uint); function allowance(address owner, address spender) external view returns (uint); function approve(address spender, uint value) external returns (bool); function transfer(address to, uint value) external returns (bool); function transferFrom(address from, address to, uint value) external returns (bool); function DOMAIN_SEPARATOR() external view returns (bytes32); function PERMIT_TYPEHASH() external pure returns (bytes32); function nonces(address owner) external view returns (uint); function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external; } library Math { function min(uint256 x, uint256 y) internal pure returns (uint256 z) { z = x < y ? x : y; } // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method) function sqrt(uint256 y) internal pure returns (uint256 z) { if (y > 3) { z = y; uint256 x = y / 2 + 1; while (x < z) { z = x; x = (y / x + x) / 2; } } else if (y != 0) { z = 1; } } } library UQ112x112 { uint224 constant Q112 = 2**112; // encode a uint112 as a UQ112x112 function encode(uint112 y) internal pure returns (uint224 z) { z = uint224(y) * Q112; // never overflows } // divide a UQ112x112 by a uint112, returning a UQ112x112 function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) { z = x / uint224(y); } } interface IERC20IoDex { event Approval(address indexed owner, address indexed spender, uint value); event Transfer(address indexed from, address indexed to, uint value); function name() external view returns (string memory); function symbol() external view returns (string memory); function decimals() external view returns (uint8); function totalSupply() external view returns (uint); function balanceOf(address owner) external view returns (uint); function allowance(address owner, address spender) external view returns (uint); function approve(address spender, uint value) external returns (bool); function transfer(address to, uint value) external returns (bool); function transferFrom(address from, address to, uint value) external returns (bool); } interface IIoDexFactory { event PairCreated( address indexed token0, address indexed token1, address pair, uint256 ); function feeTo() external view returns (address); function feeToSetter() external view returns (address); function migrator() external view returns (address); function getPair(address tokenA, address tokenB) external view returns (address pair); function allPairs(uint256) external view returns (address pair); function allPairsLength() external view returns (uint256); function createPair(address tokenA, address tokenB) external returns (address pair); function setFeeTo(address) external; function setFeeToSetter(address) external; function setMigrator(address) external; } interface IIoDexCallee { function uniswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external; } interface IMigrator { // Return the desired amount of liquidity token that the migrator wants. function desiredLiquidity() external view returns (uint256); } library SafeMathIoDex { function add(uint256 x, uint256 y) internal pure returns (uint256 z) { require((z = x + y) >= x, "ds-math-add-overflow"); } function sub(uint256 x, uint256 y) internal pure returns (uint256 z) { require((z = x - y) <= x, "ds-math-sub-underflow"); } function mul(uint256 x, uint256 y) internal pure returns (uint256 z) { require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow"); } } contract IoDexERC20 { using SafeMathIoDex for uint256; string public constant name = "IoDexBeam LP Token"; string public constant symbol = "SLP"; uint8 public constant decimals = 18; uint256 public totalSupply; mapping(address => uint256) public balanceOf; mapping(address => mapping(address => uint256)) public allowance; bytes32 public DOMAIN_SEPARATOR; // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9; mapping(address => uint256) public nonces; event Approval( address indexed owner, address indexed spender, uint256 value ); event Transfer(address indexed from, address indexed to, uint256 value); constructor() public { uint256 chainId; assembly { chainId := chainid() } DOMAIN_SEPARATOR = keccak256( abi.encode( keccak256( "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)" ), keccak256(bytes(name)), keccak256(bytes("1")), chainId, address(this) ) ); } function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal pure virtual returns (bytes calldata) { return msg.data; } function _mint(address to, uint256 value) internal { totalSupply = totalSupply.add(value); balanceOf[to] = balanceOf[to].add(value); emit Transfer(address(0), to, value); } function _burn(address from, uint256 value) internal { balanceOf[from] = balanceOf[from].sub(value); totalSupply = totalSupply.sub(value); emit Transfer(from, address(0), value); } function _approve( address owner, address spender, uint256 value ) private { allowance[owner][spender] = value; emit Approval(owner, spender, value); } function _transfer( address from, address to, uint256 value ) private { balanceOf[from] = balanceOf[from].sub(value); balanceOf[to] = balanceOf[to].add(value); emit Transfer(from, to, value); } function approve(address spender, uint256 value) external returns (bool) { _approve(_msgSender(), spender, value); return true; } function transfer(address to, uint256 value) external returns (bool) { _transfer(_msgSender(), to, value); return true; } function transferFrom( address from, address to, uint256 value ) external returns (bool) { if (allowance[from][_msgSender()] != uint256(-1)) { allowance[from][_msgSender()] = allowance[from][_msgSender()].sub( value ); } _transfer(from, to, value); return true; } function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external { require(deadline >= block.timestamp, "IoDexBeam: EXPIRED"); bytes32 digest = keccak256( abi.encodePacked( "\x19\x01", DOMAIN_SEPARATOR, keccak256( abi.encode( PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline ) ) ) ); address recoveredAddress = ecrecover(digest, v, r, s); require( recoveredAddress != address(0) && recoveredAddress == owner, "IoDexBeam: INVALID_SIGNATURE" ); _approve(owner, spender, value); } } contract IoDexPair is IoDexERC20 { using SafeMathIoDex for uint256; using UQ112x112 for uint224; uint256 public constant MINIMUM_LIQUIDITY = 10**3; bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)"))); address public factory; address public token0; address public token1; uint112 private reserve0; // uses single storage slot, accessible via getReserves uint112 private reserve1; // uses single storage slot, accessible via getReserves uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves uint256 public price0CumulativeLast; uint256 public price1CumulativeLast; uint256 public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event struct SwapVariables { uint112 _reserve0; uint112 _reserve1; uint256 balance0; uint256 balance1; uint256 amount0In; uint256 amount1In; } uint256 private unlocked = 1; modifier lock() { require(unlocked == 1, "IoDexBeam: LOCKED"); unlocked = 0; _; unlocked = 1; } function getReserves() public view returns ( uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast ) { _reserve0 = reserve0; _reserve1 = reserve1; _blockTimestampLast = blockTimestampLast; } function _safeTransfer( address token, address to, uint256 value ) private { (bool success, bytes memory data) = token.call( abi.encodeWithSelector(SELECTOR, to, value) ); require( success && (data.length == 0 || abi.decode(data, (bool))), "IoDexBeam: TRANSFER_FAILED" ); } event Mint(address indexed sender, uint256 amount0, uint256 amount1); event Burn( address indexed sender, uint256 amount0, uint256 amount1, address indexed to ); event Swap( address indexed sender, uint256 amount0In, uint256 amount1In, uint256 amount0Out, uint256 amount1Out, address indexed to ); event Sync(uint112 reserve0, uint112 reserve1); constructor() public { factory = msg.sender; } // called once by the factory at time of deployment function initialize(address _token0, address _token1) external { require(msg.sender == factory, "IoDexBeam: FORBIDDEN"); // sufficient check token0 = _token0; token1 = _token1; } // update reserves and, on the first call per block, price accumulators function _update( uint256 balance0, uint256 balance1, uint112 _reserve0, uint112 _reserve1 ) private { require( balance0 <= uint112(-1) && balance1 <= uint112(-1), "IoDexBeam: OVERFLOW" ); uint32 blockTimestamp = uint32(block.timestamp % 2**32); uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) { // * never overflows, and + overflow is desired price0CumulativeLast += uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed; price1CumulativeLast += uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed; } reserve0 = uint112(balance0); reserve1 = uint112(balance1); blockTimestampLast = blockTimestamp; emit Sync(reserve0, reserve1); } // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k) function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) { address feeTo = IIoDexFactory(factory).feeTo(); feeOn = feeTo != address(0); uint256 _kLast = kLast; // gas savings if (feeOn) { if (_kLast != 0) { uint256 rootK = Math.sqrt(uint256(_reserve0).mul(_reserve1)); uint256 rootKLast = Math.sqrt(_kLast); if (rootK > rootKLast) { uint256 numerator = totalSupply.mul(rootK.sub(rootKLast)); uint256 denominator = rootK.mul(5).add(rootKLast); uint256 liquidity = numerator / denominator; if (liquidity > 0) _mint(feeTo, liquidity); } } } else if (_kLast != 0) { kLast = 0; } } // this low-level function should be called from a contract which performs important safety checks function mint(address to) external lock returns (uint256 liquidity) { (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings uint256 balance0 = IERC20IoDex(token0).balanceOf(address(this)); uint256 balance1 = IERC20IoDex(token1).balanceOf(address(this)); uint256 amount0 = balance0.sub(_reserve0); uint256 amount1 = balance1.sub(_reserve1); bool feeOn = _mintFee(_reserve0, _reserve1); uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee if (_totalSupply == 0) { address migrator = IIoDexFactory(factory).migrator(); if (_msgSender() == migrator) { liquidity = IMigrator(migrator).desiredLiquidity(); require( liquidity > 0 && liquidity != uint256(-1), "Bad desired liquidity" ); } else { require(migrator == address(0), "Must not have migrator"); liquidity = Math.sqrt(amount0.mul(amount1)).sub( MINIMUM_LIQUIDITY ); _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens } } else { liquidity = Math.min( amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1 ); } require(liquidity > 0, "IoDexBeam: INSUFFICIENT_LIQUIDITY_MINTED"); _mint(to, liquidity); _update(balance0, balance1, _reserve0, _reserve1); if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date emit Mint(_msgSender(), amount0, amount1); } // this low-level function should be called from a contract which performs important safety checks function burn(address to) external lock returns (uint256 amount0, uint256 amount1) { (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings address _token0 = token0; // gas savings address _token1 = token1; // gas savings uint256 balance0 = IERC20IoDex(_token0).balanceOf(address(this)); uint256 balance1 = IERC20IoDex(_token1).balanceOf(address(this)); uint256 liquidity = balanceOf[address(this)]; bool feeOn = _mintFee(_reserve0, _reserve1); uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution require( amount0 > 0 && amount1 > 0, "IoDexBeam: INSUFFICIENT_LIQUIDITY_BURNED" ); _burn(address(this), liquidity); _safeTransfer(_token0, to, amount0); _safeTransfer(_token1, to, amount1); balance0 = IERC20IoDex(_token0).balanceOf(address(this)); balance1 = IERC20IoDex(_token1).balanceOf(address(this)); _update(balance0, balance1, _reserve0, _reserve1); if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date emit Burn(_msgSender(), amount0, amount1, to); } // this low-level function should be called from a contract which performs important safety checks function swap( uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data ) external lock { require( amount0Out > 0 || amount1Out > 0, "IoDexBeam: INSUFFICIENT_OUTPUT_AMOUNT" ); SwapVariables memory vars = SwapVariables(0, 0, 0, 0, 0, 0); (vars._reserve0, vars._reserve1, ) = getReserves(); // gas savings require( amount0Out < vars._reserve0 && amount1Out < vars._reserve1, "IoDexBeam: INSUFFICIENT_LIQUIDITY" ); { // scope for _token{0,1}, avoids stack too deep errors address _token0 = token0; address _token1 = token1; require(to != _token0 && to != _token1, "IoDexBeam: INVALID_TO"); if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens if (data.length > 0) IIoDexCallee(to).uniswapV2Call( _msgSender(), amount0Out, amount1Out, data ); vars.balance0 = IERC20IoDex(_token0).balanceOf(address(this)); vars.balance1 = IERC20IoDex(_token1).balanceOf(address(this)); } vars.amount0In = vars.balance0 > vars._reserve0 - amount0Out ? vars.balance0 - (vars._reserve0 - amount0Out) : 0; vars.amount1In = vars.balance1 > vars._reserve1 - amount1Out ? vars.balance1 - (vars._reserve1 - amount1Out) : 0; require( vars.amount0In > 0 || vars.amount1In > 0, "IoDexBeam: INSUFFICIENT_INPUT_AMOUNT" ); { // scope for reserve{0,1} - Adjusted, avoids stack too deep errors uint256 balance0Adjusted = vars.balance0.mul(10000).sub( vars.amount0In.mul(25) ); uint256 balance1Adjusted = vars.balance1.mul(10000).sub( vars.amount1In.mul(25) ); require( balance0Adjusted.mul(balance1Adjusted) >= uint256(vars._reserve0).mul(vars._reserve1).mul(10000**2), "IoDexBeam: K" ); } _update(vars.balance0, vars.balance1, vars._reserve0, vars._reserve1); emit Swap( _msgSender(), vars.amount0In, vars.amount1In, amount0Out, amount1Out, to ); } // force balances to match reserves function skim(address to) external lock { address _token0 = token0; // gas savings address _token1 = token1; // gas savings _safeTransfer( _token0, to, IERC20IoDex(_token0).balanceOf(address(this)).sub(reserve0) ); _safeTransfer( _token1, to, IERC20IoDex(_token1).balanceOf(address(this)).sub(reserve1) ); } // force reserves to match balances function sync() external lock { _update( IERC20IoDex(token0).balanceOf(address(this)), IERC20IoDex(token1).balanceOf(address(this)), reserve0, reserve1 ); } } contract IoDexFactory is IIoDexFactory { bytes32 public constant INIT_CODE_PAIR_HASH = keccak256(abi.encodePacked(type(IoDexPair).creationCode)); address public override feeTo; address public override feeToSetter; address public override migrator; mapping(address => mapping(address => address)) public override getPair; address[] public override allPairs; event PairCreated( address indexed token0, address indexed token1, address pair, uint256 ); constructor(address _feeToSetter) public { feeToSetter = _feeToSetter; } function allPairsLength() external view override returns (uint256) { return allPairs.length; } function createPair(address tokenA, address tokenB) external override returns (address pair) { require(tokenA != tokenB, "IoDexBeam: IDENTICAL_ADDRESSES"); (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA); require(token0 != address(0), "IoDexBeam: ZERO_ADDRESS"); require( getPair[token0][token1] == address(0), "IoDexBeam: PAIR_EXISTS" ); // single check is sufficient bytes memory bytecode = type(IoDexPair).creationCode; bytes32 salt = keccak256(abi.encodePacked(token0, token1)); assembly { pair := create2(0, add(bytecode, 32), mload(bytecode), salt) } IoDexPair(pair).initialize(token0, token1); getPair[token0][token1] = pair; getPair[token1][token0] = pair; // populate mapping in the reverse direction allPairs.push(pair); emit PairCreated(token0, token1, pair, allPairs.length); } function setFeeTo(address _feeTo) external override { require(msg.sender == feeToSetter, "IoDexBeam: FORBIDDEN"); feeTo = _feeTo; } function setMigrator(address _migrator) external override { require(msg.sender == feeToSetter, "IoDexBeam: FORBIDDEN"); migrator = _migrator; } function setFeeToSetter(address _feeToSetter) external override { require(msg.sender == feeToSetter, "IoDexBeam: FORBIDDEN"); feeToSetter = _feeToSetter; } }
[{"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token0","type":"address"},{"indexed":true,"internalType":"address","name":"token1","type":"address"},{"indexed":false,"internalType":"address","name":"pair","type":"address"},{"indexed":false,"internalType":"uint256","name":"","type":"uint256"}],"name":"PairCreated","type":"event"},{"inputs":[],"name":"INIT_CODE_PAIR_HASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"allPairs","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"allPairsLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"}],"name":"createPair","outputs":[{"internalType":"address","name":"pair","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"feeTo","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feeToSetter","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"getPair","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"migrator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_feeTo","type":"address"}],"name":"setFeeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"name":"setFeeToSetter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_migrator","type":"address"}],"name":"setMigrator","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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