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0x80aaad6651cb875d21c89579d1822432b8567ee5410661a90e08795d4c07203a | 0x6114a961 | 2711673 | 12 days 13 hrs ago | 0xd134a7d9485c1aac0cbf82718cf6d6e3fd130945 | IN | Create: ERC20CompetitiveRewardModuleInfo | 0 CLV | 0.01192029 |
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Contract Name:
ERC20CompetitiveRewardModuleInfo
Compiler Version
v0.8.4+commit.c7e474f2
Optimization Enabled:
Yes with 1000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @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); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/draft-IERC20Permit.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, "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"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // 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 /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
/* ERC20BaseRewardModule https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts SPDX-License-Identifier: MIT */ pragma solidity 0.8.4; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "./interfaces/IRewardModule.sol"; /** * @title ERC20 base reward module * * @notice this abstract class implements common ERC20 funding and unlocking * logic, which is inherited by other reward modules. */ abstract contract ERC20BaseRewardModule is IRewardModule { using SafeERC20 for IERC20; // single funding/reward schedule struct Funding { uint256 amount; uint256 shares; uint256 locked; uint256 updated; uint256 start; uint256 duration; } // constants uint256 public constant INITIAL_SHARES_PER_TOKEN = 10**6; uint256 public constant MAX_ACTIVE_FUNDINGS = 16; // funding/reward state fields mapping(address => Funding[]) private _fundings; mapping(address => uint256) private _shares; mapping(address => uint256) private _locked; /** * @notice getter for total token shares */ function totalShares(address token) public view returns (uint256) { return _shares[token]; } /** * @notice getter for total locked token shares */ function lockedShares(address token) public view returns (uint256) { return _locked[token]; } /** * @notice getter for funding schedule struct */ function fundings(address token, uint256 index) public view returns ( uint256 amount, uint256 shares, uint256 locked, uint256 updated, uint256 start, uint256 duration ) { Funding storage f = _fundings[token][index]; return (f.amount, f.shares, f.locked, f.updated, f.start, f.duration); } /** * @param token contract address of reward token * @return number of active funding schedules */ function fundingCount(address token) public view returns (uint256) { return _fundings[token].length; } /** * @notice compute number of unlockable shares for a specific funding schedule * @param token contract address of reward token * @param idx index of the funding * @return the number of unlockable shares */ function unlockable(address token, uint256 idx) public view returns (uint256) { Funding storage funding = _fundings[token][idx]; // funding schedule is in future if (block.timestamp < funding.start) { return 0; } // empty if (funding.locked == 0) { return 0; } // handle zero-duration period or leftover dust from integer division if (block.timestamp >= funding.start + funding.duration) { return funding.locked; } return ((block.timestamp - funding.updated) * funding.shares) / funding.duration; } /** * @notice fund pool by locking up reward tokens for future distribution * @param token contract address of reward token * @param amount number of reward tokens to lock up as funding * @param duration period (seconds) over which funding will be unlocked * @param start time (seconds) at which funding begins to unlock */ function _fund( address token, uint256 amount, uint256 duration, uint256 start ) internal { requireController(); // validate require(amount > 0, "Funding amount must be greater than 0"); require(start >= block.timestamp, "Invalid funding start time"); require(_fundings[token].length < MAX_ACTIVE_FUNDINGS, "Exceeds max funding rounds"); IERC20 rewardToken = IERC20(token); // do transfer of funding uint256 total = rewardToken.balanceOf(address(this)); rewardToken.safeTransferFrom(msg.sender, address(this), amount); uint256 actual = rewardToken.balanceOf(address(this)) - total; // mint shares at current rate uint256 minted = (total > 0) ? (_shares[token] * actual) / total : actual * INITIAL_SHARES_PER_TOKEN; _locked[token] += minted; _shares[token] += minted; // create new funding _fundings[token].push( Funding({ amount: amount, shares: minted, locked: minted, updated: start, start: start, duration: duration }) ); emit RewardsFunded(token, amount, minted, start); } /** * @dev internal function to clean up stale funding schedules * @param token contract address of reward token to clean up */ function _clean(address token) internal { // check for stale funding schedules to expire uint256 removed = 0; uint256 originalSize = _fundings[token].length; for (uint256 i = 0; i < originalSize; i++) { Funding storage funding = _fundings[token][i - removed]; uint256 idx = i - removed; if ( unlockable(token, idx) == 0 && block.timestamp >= funding.start + funding.duration ) { emit RewardsExpired( token, funding.amount, funding.shares, funding.start ); // remove at idx by copying last element here, then popping off last // (we don't care about order) _fundings[token][idx] = _fundings[token][ _fundings[token].length - 1 ]; _fundings[token].pop(); removed++; } } } /** * @dev unlocks reward tokens based on funding schedules * @param token contract addres of reward token * @return shares number of shares unlocked */ function _unlockTokens(address token) internal returns (uint256 shares) { // get unlockable shares for each funding schedule for (uint256 i = 0; i < _fundings[token].length; i++) { uint256 s = unlockable(token, i); Funding storage funding = _fundings[token][i]; if (s > 0) { funding.locked -= s; funding.updated = block.timestamp; shares += s; } } // do unlocking if (shares > 0) { _locked[token] -= shares; emit RewardsUnlocked(token, shares); } } /** * @dev distribute reward tokens to user * @param user address of user receiving rweard * @param token contract address of reward token * @param shares number of shares to be distributed * @return amount number of reward tokens distributed */ function _distribute( address user, address token, uint256 shares ) internal returns (uint256 amount) { // compute reward amount in tokens IERC20 rewardToken = IERC20(token); amount = (rewardToken.balanceOf(address(this)) * shares) / _shares[token]; // update overall reward shares _shares[token] -= shares; // do reward rewardToken.safeTransfer(user, amount); emit RewardsDistributed(user, token, amount, shares); } }
/* ERC20CompetitiveRewardModule https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts SPDX-License-Identifier: MIT */ pragma solidity 0.8.4; import "./interfaces/IRewardModule.sol"; import "./ERC20BaseRewardModule.sol"; import "./GysrUtils.sol"; /** * @title ERC20 competitive reward module * * @notice this reward module distributes a single ERC20 token as the staking reward. * It is designed to offer competitive and engaging reward mechanics. * * @dev share seconds are the primary unit of accounting in this module. They * are accrued over time and burned during reward distribution. Users can * earn a time multiplier as an incentive for longer term staking. They can * also receive a GYSR multiplier by spending GYSR at the time of unstaking. * * h/t https://github.com/ampleforth/token-geyser */ contract ERC20CompetitiveRewardModule is ERC20BaseRewardModule { using SafeERC20 for IERC20; using GysrUtils for uint256; // single stake by user struct Stake { uint256 shares; uint256 timestamp; } mapping(address => Stake[]) public stakes; // configuration fields uint256 public immutable bonusMin; uint256 public immutable bonusMax; uint256 public immutable bonusPeriod; IERC20 private immutable _token; address private immutable _factory; // global state fields uint256 public totalStakingShares; uint256 public totalStakingShareSeconds; uint256 public lastUpdated; uint256 private _usage; /** * @param token_ the token that will be rewarded * @param bonusMin_ initial time bonus * @param bonusMax_ maximum time bonus * @param bonusPeriod_ period (in seconds) over which time bonus grows to max * @param factory_ address of module factory */ constructor( address token_, uint256 bonusMin_, uint256 bonusMax_, uint256 bonusPeriod_, address factory_ ) { require(bonusMin_ <= bonusMax_, "Bonus value setting error"); _token = IERC20(token_); _factory = factory_; bonusMin = bonusMin_; bonusMax = bonusMax_; bonusPeriod = bonusPeriod_; lastUpdated = block.timestamp; } // -- IRewardModule ------------------------------------------------------- /** * @inheritdoc IRewardModule */ function tokens() external view override returns (address[] memory tokens_) { tokens_ = new address[](1); tokens_[0] = address(_token); } /** * @inheritdoc IRewardModule */ function balances() external view override returns (uint256[] memory balances_) { balances_ = new uint256[](1); balances_[0] = totalLocked(); } /** * @inheritdoc IRewardModule */ function usage() external view override returns (uint256) { return _usage; } /** * @inheritdoc IRewardModule */ function factory() external view override returns (address) { return _factory; } /** * @inheritdoc IRewardModule */ function stake( address account, address, uint256 shares, bytes calldata ) external override onlyOwner returns (uint256, uint256) { _update(); _stake(account, shares); return (0, 0); } /** * @inheritdoc IRewardModule */ function unstake( address account, address user, uint256 shares, bytes calldata data ) external override onlyOwner returns (uint256, uint256) { _update(); return _unstake(account, user, shares, data); } /** * @inheritdoc IRewardModule */ function claim( address account, address user, uint256 shares, bytes calldata data ) external override onlyOwner returns (uint256 spent, uint256 vested) { _update(); (spent, vested) = _unstake(account, user, shares, data); _stake(account, shares); } /** * @inheritdoc IRewardModule */ function update(address) external override { requireOwner(); _update(); } /** * @inheritdoc IRewardModule */ function clean() external override { requireOwner(); _update(); _clean(address(_token)); } // -- ERC20CompetitiveRewardModule ---------------------------------------- /** * @notice fund module by locking up reward tokens for distribution * @param amount number of reward tokens to lock up as funding * @param duration period (seconds) over which funding will be unlocked */ function fund(uint256 amount, uint256 duration) external { _update(); _fund(address(_token), amount, duration, block.timestamp); } /** * @notice fund module by locking up reward tokens for distribution * @param amount number of reward tokens to lock up as funding * @param duration period (seconds) over which funding will be unlocked * @param start time (seconds) at which funding begins to unlock */ function fund( uint256 amount, uint256 duration, uint256 start ) external { _update(); _fund(address(_token), amount, duration, start); } /** * @notice compute time bonus earned as a function of staking time * @param time length of time for which the tokens have been staked * @return bonus multiplier for time */ function timeBonus(uint256 time) public view returns (uint256) { if (time >= bonusPeriod) { return 10**DECIMALS + bonusMax; } // linearly interpolate between bonus min and bonus max uint256 bonus = bonusMin + ((bonusMax - bonusMin) * time) / bonusPeriod; return 10**DECIMALS + bonus; } /** * @return total number of locked reward tokens */ function totalLocked() public view returns (uint256) { if (lockedShares(address(_token)) == 0) { return 0; } return (_token.balanceOf(address(this)) * lockedShares(address(_token))) / totalShares(address(_token)); } /** * @return total number of unlocked reward tokens */ function totalUnlocked() public view returns (uint256) { uint256 unlockedShares = totalShares(address(_token)) - lockedShares(address(_token)); if (unlockedShares == 0) { return 0; } return (_token.balanceOf(address(this)) * unlockedShares) / totalShares(address(_token)); } /** * @param addr address of interest * @return number of active stakes for user */ function stakeCount(address addr) public view returns (uint256) { return stakes[addr].length; } // -- ERC20CompetitiveRewardModule internal ------------------------------- /** * @dev internal implementation of stake method * @param account address of staking account * @param shares number of shares burned */ function _stake(address account, uint256 shares) private { // update user staking info stakes[account].push(Stake(shares, block.timestamp)); // add newly minted shares to global total totalStakingShares += shares; } /** * @dev internal implementation of unstake method * @param account address of staking account * @param user address of user * @param shares number of shares burned * @param data additional data * @return spent amount of gysr spent * @return vested amount of gysr vested */ function _unstake( address account, address user, uint256 shares, bytes calldata data ) private returns (uint256 spent, uint256 vested) { // validate // note: we assume shares has been validated upstream require(data.length == 0 || data.length == 32, "Invalid calldata"); // parse GYSR amount from data if (data.length == 32) { assembly { spent := calldataload(164) } } uint256 bonus = spent.gysrBonus(shares, totalStakingShares, _usage); // do unstaking, first-in last-out, respecting time bonus uint256 shareSeconds; uint256 timeWeightedShareSeconds; (shareSeconds, timeWeightedShareSeconds) = _unstakeFirstInLastOut( account, shares ); // compute and apply GYSR token bonus uint256 gysrWeightedShareSeconds = (bonus * timeWeightedShareSeconds) / 10**DECIMALS; // get reward in shares uint256 unlockedShares = totalShares(address(_token)) - lockedShares(address(_token)); uint256 rewardShares = (unlockedShares * gysrWeightedShareSeconds) / (totalStakingShareSeconds + gysrWeightedShareSeconds); if (rewardShares == 0) { return (0, 0); } // reward if (rewardShares > 0) { _distribute(user, address(_token), rewardShares); // update usage uint256 ratio; if (spent > 0) { vested = spent; emit GysrSpent(user, spent); emit GysrVested(user, vested); ratio = ((bonus - 10**DECIMALS) * 10**DECIMALS) / bonus; } uint256 weight = (shareSeconds * 10**DECIMALS) / (totalStakingShareSeconds + shareSeconds); _usage = _usage - (weight * _usage) / 10**DECIMALS + (weight * ratio) / 10**DECIMALS; } } /** * @dev internal implementation of update method to * unlock tokens and do global accounting */ function _update() private { _unlockTokens(address(_token)); // global accounting totalStakingShareSeconds += (block.timestamp - lastUpdated) * totalStakingShares; lastUpdated = block.timestamp; } /** * @dev helper function to actually execute unstaking, first-in last-out, while computing and applying time bonus. This function also updates user and global totals for shares and share-seconds. * @param user address of user * @param shares number of staking shares to burn * @return rawShareSeconds raw share seconds burned * @return bonusShareSeconds time bonus weighted share seconds */ function _unstakeFirstInLastOut(address user, uint256 shares) private returns (uint256 rawShareSeconds, uint256 bonusShareSeconds) { // redeem first-in-last-out uint256 sharesLeftToBurn = shares; Stake[] storage userStakes = stakes[user]; while (sharesLeftToBurn > 0) { Stake storage lastStake = userStakes[userStakes.length - 1]; uint256 stakeTime = block.timestamp - lastStake.timestamp; require(stakeTime > 0, "Unstaking can't be done in same block with staking"); uint256 bonus = timeBonus(stakeTime); if (lastStake.shares <= sharesLeftToBurn) { // fully redeem a past stake bonusShareSeconds += (lastStake.shares * stakeTime * bonus) / 10**DECIMALS; rawShareSeconds += lastStake.shares * stakeTime; sharesLeftToBurn -= lastStake.shares; userStakes.pop(); } else { // partially redeem a past stake bonusShareSeconds += (sharesLeftToBurn * stakeTime * bonus) / 10**DECIMALS; rawShareSeconds += sharesLeftToBurn * stakeTime; lastStake.shares -= sharesLeftToBurn; sharesLeftToBurn = 0; } } // update global totals totalStakingShareSeconds -= rawShareSeconds; totalStakingShares -= shares; } }
/* GYSRUtils https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts SPDX-License-Identifier: MIT */ pragma solidity 0.8.4; import "./MathUtils.sol"; /** * @title GYSR utilities * * @notice this library implements utility methods for the GYSR multiplier * and spending mechanics */ library GysrUtils { using MathUtils for int128; // constants uint256 public constant DECIMALS = 18; uint256 public constant GYSR_PROPORTION = 10**(DECIMALS - 2); // 1% /** * @notice compute GYSR bonus as a function of usage ratio, stake amount, * and GYSR spent * @param gysr number of GYSR token applied to bonus * @param amount number of tokens or shares to unstake * @param total number of tokens or shares in overall pool * @param ratio usage ratio from 0 to 1 * @return multiplier value */ function gysrBonus( uint256 gysr, uint256 amount, uint256 total, uint256 ratio ) internal pure returns (uint256) { if (amount == 0) { return 0; } if (total == 0) { return 0; } if (gysr == 0) { return 10**DECIMALS; } // scale GYSR amount with respect to proportion uint256 portion = (GYSR_PROPORTION * total) / 10**DECIMALS; if (amount > portion) { gysr = (gysr * portion) / amount; } // 1 + gysr / (0.01 + ratio) uint256 x = 2**64 + (2**64 * gysr) / (10**(DECIMALS - 2) + ratio); return 10**DECIMALS + (uint256(int256(int128(uint128(x)).logbase10())) * 10**DECIMALS) / 2**64; } }
/* ERC20CompetitiveRewardModuleInfo https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts SPDX-License-Identifier: MIT */ pragma solidity 0.8.4; import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol"; import "../interfaces/IRewardModule.sol"; import "../ERC20CompetitiveRewardModule.sol"; import "../GysrUtils.sol"; /** * @title ERC20 competitive reward module info library * * @notice this library provides read-only convenience functions to query * additional information about the ERC20CompetitiveRewardModule contract. */ library ERC20CompetitiveRewardModuleInfo { using GysrUtils for uint256; /** * @notice convenience function to get token metadata in a single call * @param module address of reward module * @return address * @return name * @return symbol * @return decimals */ function token(address module) public view returns ( address, string memory, string memory, uint8 ) { IRewardModule m = IRewardModule(module); IERC20Metadata tkn = IERC20Metadata(m.tokens()[0]); return (address(tkn), tkn.name(), tkn.symbol(), tkn.decimals()); } /** * @notice preview estimated rewards * @param module address of reward module * @param addr account address of interest for preview * @param shares number of shares that would be unstaked * @param gysr number of GYSR tokens that would be applied * @return estimated reward * @return estimated time multiplier * @return estimated gysr multiplier */ function rewards( address module, address addr, uint256 shares, uint256 gysr ) public view returns ( uint256, uint256, uint256 ) { ERC20CompetitiveRewardModule m = ERC20CompetitiveRewardModule(module); // get associated share seconds uint256 rawShareSeconds; uint256 bonusShareSeconds; (rawShareSeconds, bonusShareSeconds) = userShareSeconds( module, addr, shares ); if (rawShareSeconds == 0) { return (0, 0, 0); } uint256 timeBonus = (bonusShareSeconds * 1e18) / rawShareSeconds; // apply gysr bonus uint256 gysrBonus = gysr.gysrBonus(shares, m.totalStakingShares(), m.usage()); bonusShareSeconds = (gysrBonus * bonusShareSeconds) / 1e18; // compute rewards based on expected updates uint256 reward = (unlocked(module) * bonusShareSeconds) / (totalShareSeconds(module) + bonusShareSeconds - rawShareSeconds); return (reward, timeBonus, gysrBonus); } /** * @notice compute effective unlocked rewards * @param module address of reward module * @return estimated current unlocked rewards */ function unlocked(address module) public view returns (uint256) { ERC20CompetitiveRewardModule m = ERC20CompetitiveRewardModule(module); // compute expected updates to global totals uint256 deltaUnlocked; address tkn = m.tokens()[0]; uint256 totalLockedShares = m.lockedShares(tkn); if (totalLockedShares != 0) { uint256 sharesToUnlock; for (uint256 i = 0; i < m.fundingCount(tkn); i++) { sharesToUnlock = sharesToUnlock + m.unlockable(tkn, i); } deltaUnlocked = (sharesToUnlock * m.totalLocked()) / totalLockedShares; } return m.totalUnlocked() + deltaUnlocked; } /** * @notice compute user share seconds for given number of shares * @param module module contract address * @param addr user address * @param shares number of shares * @return raw share seconds * @return time bonus share seconds */ function userShareSeconds( address module, address addr, uint256 shares ) public view returns (uint256, uint256) { require(shares > 0, "crmi1"); ERC20CompetitiveRewardModule m = ERC20CompetitiveRewardModule(module); uint256 rawShareSeconds; uint256 timeBonusShareSeconds; // compute first-in-last-out, time bonus weighted, share seconds uint256 i = m.stakeCount(addr); while (shares > 0) { require(i > 0, "crmi2"); i -= 1; uint256 s; uint256 time; (s, time) = m.stakes(addr, i); time = block.timestamp - time; // only redeem partial stake if more shares left than needed to burn s = s < shares ? s : shares; rawShareSeconds += (s * time); timeBonusShareSeconds += ((s * time * m.timeBonus(time)) / 1e18); shares -= s; } return (rawShareSeconds, timeBonusShareSeconds); } /** * @notice compute total expected share seconds for a rewards module * @param module address for reward module * @return expected total shares seconds */ function totalShareSeconds(address module) public view returns (uint256) { ERC20CompetitiveRewardModule m = ERC20CompetitiveRewardModule(module); return m.totalStakingShareSeconds() + (block.timestamp - m.lastUpdated()) * m.totalStakingShares(); } }
/* IEvents https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts SPDX-License-Identifier: MIT */ pragma solidity 0.8.4; /** * @title GYSR event system * * @notice common interface to define GYSR event system */ interface IEvents { // staking event Staked( address indexed user, address indexed token, uint256 amount, uint256 shares ); event Unstaked( address indexed user, address indexed token, uint256 amount, uint256 shares ); event Claimed( address indexed user, address indexed token, uint256 amount, uint256 shares ); // rewards event RewardsDistributed( address indexed user, address indexed token, uint256 amount, uint256 shares ); event RewardsFunded( address indexed token, uint256 amount, uint256 shares, uint256 timestamp ); event RewardsUnlocked(address indexed token, uint256 shares); event RewardsExpired( address indexed token, uint256 amount, uint256 shares, uint256 timestamp ); // gysr event GysrSpent(address indexed user, uint256 amount); event GysrVested(address indexed user, uint256 amount); event GysrWithdrawn(uint256 amount); }
/* IRewardModule https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts SPDX-License-Identifier: MIT */ pragma solidity 0.8.4; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "./IEvents.sol"; import "../OwnerController.sol"; /** * @title Reward module interface * * @notice this contract defines the common interface that any reward module * must implement to be compatible with the modular Pool architecture. */ abstract contract IRewardModule is OwnerController, IEvents { // constants uint256 public constant DECIMALS = 18; /** * @return array of reward tokens */ function tokens() external view virtual returns (address[] memory); /** * @return array of reward token balances */ function balances() external view virtual returns (uint256[] memory); /** * @return GYSR usage ratio for reward module */ function usage() external view virtual returns (uint256); /** * @return address of module factory */ function factory() external view virtual returns (address); /** * @notice perform any necessary accounting for new stake * @param account address of staking account * @param user address of user * @param shares number of new shares minted * @param data addtional data * @return amount of gysr spent * @return amount of gysr vested */ function stake( address account, address user, uint256 shares, bytes calldata data ) external virtual returns (uint256, uint256); /** * @notice reward user and perform any necessary accounting for unstake * @param account address of staking account * @param user address of user * @param shares number of shares burned * @param data additional data * @return amount of gysr spent * @return amount of gysr vested */ function unstake( address account, address user, uint256 shares, bytes calldata data ) external virtual returns (uint256, uint256); /** * @notice reward user and perform and necessary accounting for existing stake * @param account address of staking account * @param user address of user * @param shares number of shares being claimed against * @param data addtional data * @return amount of gysr spent * @return amount of gysr vested */ function claim( address account, address user, uint256 shares, bytes calldata data ) external virtual returns (uint256, uint256); /** * @notice method called by anyone to update accounting * @param user address of user for update * @dev will only be called ad hoc and should not contain essential logic */ function update(address user) external virtual; /** * @notice method called by owner to clean up and perform additional accounting * @dev will only be called ad hoc and should not contain any essential logic */ function clean() external virtual; }
/* MathUtils https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts SPDX-License-Identifier: BSD-4-Clause */ pragma solidity 0.8.4; /** * @title Math utilities * * @notice this library implements various logarithmic math utilies which support * other contracts and specifically the GYSR multiplier calculation * * @dev h/t https://github.com/abdk-consulting/abdk-libraries-solidity */ library MathUtils { /** * @notice calculate binary logarithm of x * * @param x signed 64.64-bit fixed point number, require x > 0 * @return signed 64.64-bit fixed point number */ function logbase2(int128 x) internal pure returns (int128) { unchecked { require(x > 0); int256 msb = 0; int256 xc = x; if (xc >= 0x10000000000000000) { xc >>= 64; msb += 64; } if (xc >= 0x100000000) { xc >>= 32; msb += 32; } if (xc >= 0x10000) { xc >>= 16; msb += 16; } if (xc >= 0x100) { xc >>= 8; msb += 8; } if (xc >= 0x10) { xc >>= 4; msb += 4; } if (xc >= 0x4) { xc >>= 2; msb += 2; } if (xc >= 0x2) msb += 1; // No need to shift xc anymore int256 result = (msb - 64) << 64; uint256 ux = uint256(int256(x)) << uint256(127 - msb); for (int256 bit = 0x8000000000000000; bit > 0; bit >>= 1) { ux *= ux; uint256 b = ux >> 255; ux >>= 127 + b; result += bit * int256(b); } return int128(result); } } /** * @notice calculate natural logarithm of x * @dev magic constant comes from ln(2) * 2^128 -> hex * @param x signed 64.64-bit fixed point number, require x > 0 * @return signed 64.64-bit fixed point number */ function ln(int128 x) internal pure returns (int128) { unchecked { require(x > 0); return int128( int256( (uint256(int256(logbase2(x))) * 0xB17217F7D1CF79ABC9E3B39803F2F6AF) >> 128 ) ); } } /** * @notice calculate logarithm base 10 of x * @dev magic constant comes from log10(2) * 2^128 -> hex * @param x signed 64.64-bit fixed point number, require x > 0 * @return signed 64.64-bit fixed point number */ function logbase10(int128 x) internal pure returns (int128) { require(x > 0); return int128( int256( (uint256(int256(logbase2(x))) * 0x4d104d427de7fce20a6e420e02236748) >> 128 ) ); } // wrapper functions to allow testing function testlogbase2(int128 x) public pure returns (int128) { return logbase2(x); } function testlogbase10(int128 x) public pure returns (int128) { return logbase10(x); } }
/* OwnerController https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts SPDX-License-Identifier: MIT */ pragma solidity 0.8.4; /** * @title Owner controller * * @notice this base contract implements an owner-controller access model. * * @dev the contract is an adapted version of the OpenZeppelin Ownable contract. * It allows the owner to designate an additional account as the controller to * perform restricted operations. * * Other changes include supporting role verification with a require method * in addition to the modifier option, and removing some unneeded functionality. * * Original contract here: * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol */ contract OwnerController { address private _owner; address private _controller; event OwnershipTransferred( address indexed previousOwner, address indexed newOwner ); event ControlTransferred( address indexed previousController, address indexed newController ); constructor() { _owner = msg.sender; _controller = msg.sender; emit OwnershipTransferred(address(0), _owner); emit ControlTransferred(address(0), _owner); } /** * @dev Returns the address of the current owner. */ function owner() public view returns (address) { return _owner; } /** * @dev Returns the address of the current controller. */ function controller() public view returns (address) { return _controller; } /** * @dev Modifier that throws if called by any account other than the owner. */ modifier onlyOwner() { require(_owner == msg.sender, "Only owner can perform this action"); _; } /** * @dev Modifier that throws if called by any account other than the controller. */ modifier onlyController() { require(_controller == msg.sender, "Only controller can perform this action"); _; } /** * @dev Throws if called by any account other than the owner. */ function requireOwner() internal view { require(_owner == msg.sender, "Only owner can perform this action"); } /** * @dev Throws if called by any account other than the controller. */ function requireController() internal view { require(_controller == msg.sender, "Only controller can perform this action"); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). This can * include renouncing ownership by transferring to the zero address. * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual { requireOwner(); require(newOwner != address(0), "New owner address can't be zero"); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } /** * @dev Transfers control of the contract to a new account (`newController`). * Can only be called by the owner. */ function transferControl(address newController) public virtual { requireOwner(); require(newController != address(0), "New controller address can't be zero"); emit ControlTransferred(_controller, newController); _controller = newController; } }
{ "optimizer": { "enabled": true, "runs": 1000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
[{"inputs":[{"internalType":"address","name":"module","type":"address"},{"internalType":"address","name":"addr","type":"address"},{"internalType":"uint256","name":"shares","type":"uint256"},{"internalType":"uint256","name":"gysr","type":"uint256"}],"name":"rewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"module","type":"address"}],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"string","name":"","type":"string"},{"internalType":"string","name":"","type":"string"},{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"module","type":"address"}],"name":"totalShareSeconds","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"module","type":"address"}],"name":"unlocked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"module","type":"address"},{"internalType":"address","name":"addr","type":"address"},{"internalType":"uint256","name":"shares","type":"uint256"}],"name":"userShareSeconds","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]
Contract Creation Code
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