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Minimal Proxy Contract for 0x441745aec50db58a5bde1fef916d84771235aaf2
Contract Name:
ExtraRewardStashV3
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; import "./Interfaces.sol"; import "./interfaces/IRewardHook.sol"; import "./StashToken.sol"; import "@openzeppelin/contracts-0.6/math/SafeMath.sol"; import "@openzeppelin/contracts-0.6/proxy/Clones.sol"; import "@openzeppelin/contracts-0.6/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts-0.6/utils/Address.sol"; import "@openzeppelin/contracts-0.6/token/ERC20/SafeERC20.sol"; /** * @title ExtraRewardStashV3 * @author ConvexFinance -> AuraFinance * @notice ExtraRewardStash for pools added to the Booster to handle extra rewards * that aren't CRV that can be claimed from a gauge. * - v3.0: Support for curve gauge reward redirect * The Booster contract has a function called setGaugeRedirect. This function calls set_rewards_receiver * On the Curve Guage. This tells the Gauge where to send rewards. The Booster crafts the calldata for this * transaction and then calls execute on the VoterProxy which executes this transaction on the Curve Gauge * - v3.1: Support for arbitrary token rewards outside of gauge rewards add * reward hook to pull rewards during claims * - v3.2: Move constuctor to init function for proxy creation */ contract ExtraRewardStashV3 { using SafeERC20 for IERC20; using Address for address; using SafeMath for uint256; address public immutable crv; uint256 private constant maxRewards = 8; uint256 public pid; address public operator; address public staker; address public gauge; address public rewardFactory; address public stashTokenImplementation; mapping(address => uint256) public historicalRewards; bool public hasRedirected; bool public hasCurveRewards; struct TokenInfo { address token; address rewardAddress; address stashToken; } //use mapping+array so that we dont have to loop check each time setToken is called mapping(address => TokenInfo) public tokenInfo; address[] public tokenList; //address to call for reward pulls address public rewardHook; /** * @param _crv CRV token address */ constructor(address _crv) public { crv = _crv; } /** * @param _pid Pool ID * @param _operator Operator (Booster) * @param _staker Staker (VoterProxy) * @param _gauge Gauge * @param _rFactory Reward factory */ function initialize(uint256 _pid, address _operator, address _staker, address _gauge, address _rFactory) external { require(gauge == address(0),"!init"); pid = _pid; operator = _operator; staker = _staker; gauge = _gauge; rewardFactory = _rFactory; stashTokenImplementation = address(new StashToken(address(this))); } function getName() external pure returns (string memory) { return "ExtraRewardStashV3.2"; } function tokenCount() external view returns (uint256){ return tokenList.length; } /** * @notice Claim rewards from the gauge * @dev The Stash's claimRewards function calls claimRewards on the Booster contract * which calls claimRewards on the VoterProxy which calls claim_rewards on the gauge * If a RewardHook is set onRewardClaim is also called on that * Called by Booster earmarkRewards * Guage rewards are sent directly to this stash even though the Curve method claim_rewards * is being called by the VoterProxy. This is because Curves guages have the ability to redirect * rewards to somewhere other than msg.sender. This is setup in Booster setGaugeRedirect */ function claimRewards() external returns (bool) { require(msg.sender == operator, "!operator"); //this is updateable from v2 gauges now so must check each time. checkForNewRewardTokens(); //make sure we're redirected if(!hasRedirected){ IDeposit(operator).setGaugeRedirect(pid); hasRedirected = true; } if(hasCurveRewards){ //claim rewards on gauge for staker //using reward_receiver so all rewards will be moved to this stash IDeposit(operator).claimRewards(pid,gauge); } //hook for reward pulls if(rewardHook != address(0)){ try IRewardHook(rewardHook).onRewardClaim(){ }catch{} } return true; } //check if gauge rewards have changed function checkForNewRewardTokens() internal { for(uint256 i = 0; i < maxRewards; i++){ address token = ICurveGauge(gauge).reward_tokens(i); if (token == address(0)) { break; } if(!hasCurveRewards){ hasCurveRewards = true; } setToken(token); } } //register an extra reward token to be handled // (any new incentive that is not directly on curve gauges) function setExtraReward(address _token) external{ //owner of booster can set extra rewards require(IDeposit(operator).owner() == msg.sender, "!owner"); require(tokenList.length < 4, "too many rewards"); setToken(_token); } function setRewardHook(address _hook) external{ //owner of booster can set reward hook require(IDeposit(operator).owner() == msg.sender, "!owner"); rewardHook = _hook; } /** * @notice Add a reward token to the token list so it can be claimed * @dev For each token that is added as a claimable reward a VirtualRewardsPool * is deployed to handle virtual distribution of tokens */ function setToken(address _token) internal { TokenInfo storage t = tokenInfo[_token]; if(t.token == address(0) && _token != crv){ //set token address t.token = _token; StashToken stashToken = StashToken(Clones.clone(stashTokenImplementation)); // we only want to add rewards that are not CRV //create new reward contract (for NON-crv tokens only) (,,,address mainRewardContract,,) = IDeposit(operator).poolInfo(pid); address rewardContract = IRewardFactory(rewardFactory).CreateTokenRewards( address(stashToken), mainRewardContract, address(this)); stashToken.init(operator, rewardContract, _token); t.rewardAddress = rewardContract; t.stashToken = address(stashToken); //add token to list of known rewards tokenList.push(_token); } } //pull assigned tokens from staker to stash function stashRewards() external pure returns(bool){ //after depositing/withdrawing, extra incentive tokens are claimed //but from v3 this is default to off, and this stash is the reward receiver too. return true; } /** * @notice Distribute rewards * @dev Send all extra token rewards to the rewardContract VirtualRewardsPool * Called by Booster earmarkRewards */ function processStash() external returns(bool){ require(msg.sender == operator, "!operator"); uint256 tCount = tokenList.length; for(uint i=0; i < tCount; i++){ TokenInfo storage t = tokenInfo[tokenList[i]]; address token = t.token; if(token == address(0)) continue; if(!StashToken(t.stashToken).isValid()) continue; uint256 amount = IERC20(token).balanceOf(address(this)); if (amount > 0) { historicalRewards[token] = historicalRewards[token].add(amount); //add to reward contract address rewards = t.rewardAddress; if(rewards == address(0)) continue; address stashToken = t.stashToken; IERC20(token).safeApprove(stashToken, 0); IERC20(token).safeApprove(stashToken, amount); StashToken(stashToken).mint(amount); IRewards(rewards).queueNewRewards(amount); } } return true; } }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; interface ICurveGauge { function deposit(uint256) external; function balanceOf(address) external view returns (uint256); function withdraw(uint256) external; function claim_rewards() external; function reward_tokens(uint256) external view returns(address);//v2 function rewarded_token() external view returns(address);//v1 function lp_token() external view returns(address); } interface ICurveVoteEscrow { function create_lock(uint256, uint256) external; function increase_amount(uint256) external; function increase_unlock_time(uint256) external; function withdraw() external; function smart_wallet_checker() external view returns (address); function commit_smart_wallet_checker(address) external; function apply_smart_wallet_checker() external; } interface IWalletChecker { function check(address) external view returns (bool); function approveWallet(address) external; function dao() external view returns (address); } interface IVoting{ function vote(uint256, bool, bool) external; //voteId, support, executeIfDecided function getVote(uint256) external view returns(bool,bool,uint64,uint64,uint64,uint64,uint256,uint256,uint256,bytes memory); function vote_for_gauge_weights(address,uint256) external; } interface IMinter{ function mint(address) external; } interface IStaker{ function deposit(address, address) external returns (bool); function withdraw(address) external returns (uint256); function withdraw(address, address, uint256) external returns (bool); function withdrawAll(address, address) external returns (bool); function createLock(uint256, uint256) external returns(bool); function increaseAmount(uint256) external returns(bool); function increaseTime(uint256) external returns(bool); function release() external returns(bool); function claimCrv(address) external returns (uint256); function claimRewards(address) external returns(bool); function claimFees(address,address) external returns (uint256); function setStashAccess(address, bool) external returns (bool); function vote(uint256,address,bool) external returns(bool); function voteGaugeWeight(address,uint256) external returns(bool); function balanceOfPool(address) external view returns (uint256); function operator() external view returns (address); function execute(address _to, uint256 _value, bytes calldata _data) external returns (bool, bytes memory); function setVote(bytes32 hash, bool valid) external; function migrate(address to) external; } interface IRewards{ function stake(address, uint256) external; function stakeFor(address, uint256) external; function withdraw(address, uint256) external; function exit(address) external; function getReward(address) external; function queueNewRewards(uint256) external; function notifyRewardAmount(uint256) external; function addExtraReward(address) external; function extraRewardsLength() external view returns (uint256); function stakingToken() external view returns (address); function rewardToken() external view returns(address); function earned(address account) external view returns (uint256); } interface IStash{ function stashRewards() external returns (bool); function processStash() external returns (bool); function claimRewards() external returns (bool); function initialize(uint256 _pid, address _operator, address _staker, address _gauge, address _rewardFactory) external; function setExtraReward(address) external; } interface IFeeDistributor { function claimToken(address user, address token) external returns (uint256); function claimTokens(address user, address[] calldata tokens) external returns (uint256[] memory); function getTokenTimeCursor(address token) external view returns (uint256); } interface ITokenMinter{ function mint(address,uint256) external; function burn(address,uint256) external; } interface IDeposit{ function isShutdown() external view returns(bool); function balanceOf(address _account) external view returns(uint256); function totalSupply() external view returns(uint256); function poolInfo(uint256) external view returns(address,address,address,address,address, bool); function rewardClaimed(uint256,address,uint256) external; function withdrawTo(uint256,uint256,address) external; function claimRewards(uint256,address) external returns(bool); function rewardArbitrator() external returns(address); function setGaugeRedirect(uint256 _pid) external returns(bool); function owner() external returns(address); function deposit(uint256 _pid, uint256 _amount, bool _stake) external returns(bool); } interface ICrvDeposit{ function deposit(uint256, bool) external; function lockIncentive() external view returns(uint256); } interface IRewardFactory{ function setAccess(address,bool) external; function CreateCrvRewards(uint256,address,address) external returns(address); function CreateTokenRewards(address,address,address) external returns(address); function activeRewardCount(address) external view returns(uint256); function addActiveReward(address,uint256) external returns(bool); function removeActiveReward(address,uint256) external returns(bool); } interface IStashFactory{ function CreateStash(uint256,address,address,uint256) external returns(address); function setImplementation(address, address, address) external; } interface ITokenFactory{ function CreateDepositToken(address) external returns(address); } interface IPools{ function addPool(address _lptoken, address _gauge, uint256 _stashVersion) external returns(bool); function forceAddPool(address _lptoken, address _gauge, uint256 _stashVersion) external returns(bool); function shutdownPool(uint256 _pid) external returns(bool); function poolInfo(uint256) external view returns(address,address,address,address,address,bool); function poolLength() external view returns (uint256); function gaugeMap(address) external view returns(bool); function setPoolManager(address _poolM) external; function shutdownSystem() external; function setUsedAddress(address[] memory) external; } interface IVestedEscrow{ function fund(address[] calldata _recipient, uint256[] calldata _amount) external returns(bool); } interface IRewardDeposit { function addReward(address, uint256) external; } interface ILocker { function lock(address _account, uint256 _amount) external; function checkpointEpoch() external; function epochCount() external view returns (uint256); function balanceAtEpochOf(uint256 _epoch, address _user) external view returns (uint256 amount); function totalSupplyAtEpoch(uint256 _epoch) external view returns (uint256 supply); function queueNewRewards(address _rewardsToken, uint256 reward) external; function getReward(address _account, bool _stake) external; function getReward(address _account) external; }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; interface IRewardHook { function onRewardClaim() external; }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; import "./Interfaces.sol"; import "@openzeppelin/contracts-0.6/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts-0.6/token/ERC20/SafeERC20.sol"; import "@openzeppelin/contracts-0.6/math/SafeMath.sol"; import "@openzeppelin/contracts-upgradeable-0.6/utils/ReentrancyGuardUpgradeable.sol"; interface IERC20Metadata { function name() external view returns (string memory); function symbol() external view returns (string memory); } contract StashToken is ReentrancyGuardUpgradeable { using SafeERC20 for IERC20; using SafeMath for uint256; uint256 public constant MAX_TOTAL_SUPPLY = 1e38; address public immutable stash; address public operator; address public rewardPool; address public baseToken; bool public isValid; bool public isImplementation; uint256 internal _totalSupply; constructor(address _stash) public { stash = _stash; isImplementation = true; } function init( address _operator, address _rewardPool, address _baseToken ) external initializer { require(!isImplementation, "isImplementation"); __ReentrancyGuard_init(); operator = _operator; rewardPool = _rewardPool; baseToken = _baseToken; isValid = true; } function name() external view returns (string memory) { return string(abi.encodePacked("Stash Token ", IERC20Metadata(baseToken).name())); } function symbol() external view returns (string memory) { return string(abi.encodePacked("STASH-", IERC20Metadata(baseToken).symbol())); } function setIsValid(bool _isValid) external { require(msg.sender == IDeposit(operator).owner(), "!owner"); isValid = _isValid; } function totalSupply() public view returns (uint256) { return _totalSupply; } function mint(uint256 _amount) external nonReentrant { require(msg.sender == stash, "!stash"); require(_totalSupply.add(_amount) < MAX_TOTAL_SUPPLY, "totalSupply exceeded"); _totalSupply = _totalSupply.add(_amount); IERC20(baseToken).safeTransferFrom(msg.sender, address(this), _amount); } function transfer(address _to, uint256 _amount) public nonReentrant returns (bool) { require(msg.sender == rewardPool, "!rewardPool"); require(_totalSupply >= _amount, "amount>totalSupply"); _totalSupply = _totalSupply.sub(_amount); IERC20(baseToken).safeTransfer(_to, _amount); return true; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when 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. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b > a) return (false, 0); return (true, a - b); } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a / b); } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a % b); } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a, "SafeMath: subtraction overflow"); return a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) return 0; uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: division by zero"); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: modulo by zero"); return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); return a - b; } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryDiv}. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev https://eips.ethereum.org/EIPS/eip-1167[EIP 1167] is a standard for * deploying minimal proxy contracts, also known as "clones". * * > To simply and cheaply clone contract functionality in an immutable way, this standard specifies * > a minimal bytecode implementation that delegates all calls to a known, fixed address. * * The library includes functions to deploy a proxy using either `create` (traditional deployment) or `create2` * (salted deterministic deployment). It also includes functions to predict the addresses of clones deployed using the * deterministic method. * * _Available since v3.4._ */ library Clones { /** * @dev Deploys and returns the address of a clone that mimics the behaviour of `master`. * * This function uses the create opcode, which should never revert. */ function clone(address master) internal returns (address instance) { // solhint-disable-next-line no-inline-assembly assembly { let ptr := mload(0x40) mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000) mstore(add(ptr, 0x14), shl(0x60, master)) mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000) instance := create(0, ptr, 0x37) } require(instance != address(0), "ERC1167: create failed"); } /** * @dev Deploys and returns the address of a clone that mimics the behaviour of `master`. * * This function uses the create2 opcode and a `salt` to deterministically deploy * the clone. Using the same `master` and `salt` multiple time will revert, since * the clones cannot be deployed twice at the same address. */ function cloneDeterministic(address master, bytes32 salt) internal returns (address instance) { // solhint-disable-next-line no-inline-assembly assembly { let ptr := mload(0x40) mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000) mstore(add(ptr, 0x14), shl(0x60, master)) mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000) instance := create2(0, ptr, 0x37, salt) } require(instance != address(0), "ERC1167: create2 failed"); } /** * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}. */ function predictDeterministicAddress(address master, bytes32 salt, address deployer) internal pure returns (address predicted) { // solhint-disable-next-line no-inline-assembly assembly { let ptr := mload(0x40) mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000) mstore(add(ptr, 0x14), shl(0x60, master)) mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf3ff00000000000000000000000000000000) mstore(add(ptr, 0x38), shl(0x60, deployer)) mstore(add(ptr, 0x4c), salt) mstore(add(ptr, 0x6c), keccak256(ptr, 0x37)) predicted := keccak256(add(ptr, 0x37), 0x55) } } /** * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}. */ function predictDeterministicAddress(address master, bytes32 salt) internal view returns (address predicted) { return predictDeterministicAddress(master, salt, address(this)); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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 `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); }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.2 <0.8.0; /** * @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 * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 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"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (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"); // solhint-disable-next-line avoid-low-level-calls (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"); // solhint-disable-next-line avoid-low-level-calls (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"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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 // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "./IERC20.sol"; import "../../math/SafeMath.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 SafeMath for uint256; 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' // solhint-disable-next-line max-line-length 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).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); _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 // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "../proxy/Initializable.sol"; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuardUpgradeable is Initializable { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; function __ReentrancyGuard_init() internal initializer { __ReentrancyGuard_init_unchained(); } function __ReentrancyGuard_init_unchained() internal initializer { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and make it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } uint256[49] private __gap; }
// SPDX-License-Identifier: MIT // solhint-disable-next-line compiler-version pragma solidity >=0.4.24 <0.8.0; import "../utils/AddressUpgradeable.sol"; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. */ bool private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Modifier to protect an initializer function from being invoked twice. */ modifier initializer() { require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized"); bool isTopLevelCall = !_initializing; if (isTopLevelCall) { _initializing = true; _initialized = true; } _; if (isTopLevelCall) { _initializing = false; } } /// @dev Returns true if and only if the function is running in the constructor function _isConstructor() private view returns (bool) { return !AddressUpgradeable.isContract(address(this)); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.2 <0.8.0; /** * @dev Collection of functions related to the address type */ library AddressUpgradeable { /** * @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 * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 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"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (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"); // solhint-disable-next-line avoid-low-level-calls (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"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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 // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
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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.