ERC-20
dYdX
Overview
Max Total Supply
545,831,659.999500496618019619 wethDYDX
Holders
4,196 ( 0.048%)
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
111.3069661605435913 wethDYDXValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
WrappedEthereumDydxToken
Compiler Version
v0.7.5+commit.eb77ed08
Optimization Enabled:
Yes with 200 runs
Other Settings:
berlin EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: AGPL-3.0 pragma solidity 0.7.5; import { IBridge } from './IBridge.sol'; import { ERC20 } from '../../dependencies/open-zeppelin/ERC20.sol'; import { SafeERC20 } from '../../dependencies/open-zeppelin/SafeERC20.sol'; import { SafeMath } from '../../dependencies/open-zeppelin/SafeMath.sol'; import { IERC20 } from '../../interfaces/IERC20.sol'; import { GovernancePowerDelegationERC20Mixin } from '../token/GovernancePowerDelegationERC20Mixin.sol'; /** * @title WrappedEthereumDydxToken * @author dYdX * * @notice The Wrapped Ethereum DYDX governance token. */ contract WrappedEthereumDydxToken is GovernancePowerDelegationERC20Mixin, IBridge { using SafeERC20 for IERC20; using SafeMath for uint256; // ============ Constants ============ string internal constant NAME = 'Wrapped Ethereum DYDX'; string internal constant SYMBOL = 'wethDYDX'; bytes32 public immutable DOMAIN_SEPARATOR; bytes public constant EIP712_VERSION = '1'; bytes32 public constant EIP712_DOMAIN = keccak256( 'EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)' ); bytes32 public constant PERMIT_TYPEHASH = keccak256( 'Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)' ); IERC20 public immutable DYDX_TOKEN; // ============ Storage ============ /// @dev Mapping from (owner) => (next valid nonce) for EIP-712 signatures. mapping(address => uint256) internal _nonces; mapping(address => mapping(uint256 => Snapshot)) public _votingSnapshots; mapping(address => uint256) public _votingSnapshotsCounts; mapping(address => address) public _votingDelegates; mapping(address => mapping(uint256 => Snapshot)) public _propositionPowerSnapshots; mapping(address => uint256) public _propositionPowerSnapshotsCounts; mapping(address => address) public _propositionPowerDelegates; /// @notice The next available (unused) id for the bridge event. Equal to the number of events. uint256 public _nextAvailableBridgeId; // ============ Constructor ============ /** * @notice Constructor. * @param tokenAddress The address of the token to bridge. */ constructor( ERC20 tokenAddress ) ERC20(NAME, SYMBOL) { uint256 chainId; // solium-disable-next-line assembly { chainId := chainid() } DOMAIN_SEPARATOR = keccak256( abi.encode( EIP712_DOMAIN, keccak256(bytes(NAME)), keccak256(bytes(EIP712_VERSION)), chainId, address(this) ) ); DYDX_TOKEN = tokenAddress; } /** * @notice Bridge the DYDX token and receive wethDYDX. * * @param amount The amount of tokens to bridge * @param accAddress The address to send to. * @param memo Arbitrary memo to include in the event. For possible future compatibility. */ function bridge( uint256 amount, bytes calldata accAddress, bytes calldata memo ) external override { // Wrap the tokens. DYDX_TOKEN.safeTransferFrom(msg.sender, address(this), amount); _mint(msg.sender, amount); // Emit the event and increase the nonce. uint256 nonce = _nextAvailableBridgeId; emit Bridge( nonce, amount, msg.sender, accAddress, memo ); _nextAvailableBridgeId = nonce + 1; } /** * @notice Implements the permit function as specified in EIP-2612. * * @param owner Address of the token owner. * @param spender Address of the spender. * @param value Amount of allowance. * @param deadline Expiration timestamp for the signature. * @param v Signature param. * @param r Signature param. * @param s Signature param. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external { require(owner != address(0), 'INVALID_OWNER'); require(block.timestamp <= deadline, 'INVALID_EXPIRATION'); uint256 currentValidNonce = _nonces[owner]; bytes32 digest = keccak256( abi.encodePacked( '\x19\x01', DOMAIN_SEPARATOR, keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, currentValidNonce, deadline)) ) ); require(owner == ecrecover(digest, v, r, s), 'INVALID_SIGNATURE'); _nonces[owner] = currentValidNonce.add(1); _approve(owner, spender, value); } /** * @notice Get the next valid nonce for EIP-712 signatures. * * This nonce should be used when signing for any of the following functions: * - permit() * - delegateByTypeBySig() * - delegateBySig() */ function nonces(address owner) external view returns (uint256) { return _nonces[owner]; } /** * @dev Writes a snapshot before any transfer operation, including: _transfer, _mint and _burn. * - On _transfer, it writes snapshots for both 'from' and 'to'. * - On _mint, only for `to`. * - On _burn, only for `from`. * * @param from The sender. * @param to The recipient. * @param amount The amount being transfered. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal override { address votingFromDelegatee = _getDelegatee(from, _votingDelegates); address votingToDelegatee = _getDelegatee(to, _votingDelegates); _moveDelegatesByType( votingFromDelegatee, votingToDelegatee, amount, DelegationType.VOTING_POWER ); address propPowerFromDelegatee = _getDelegatee(from, _propositionPowerDelegates); address propPowerToDelegatee = _getDelegatee(to, _propositionPowerDelegates); _moveDelegatesByType( propPowerFromDelegatee, propPowerToDelegatee, amount, DelegationType.PROPOSITION_POWER ); } function _getDelegationDataByType(DelegationType delegationType) internal override view returns ( mapping(address => mapping(uint256 => Snapshot)) storage, // snapshots mapping(address => uint256) storage, // snapshots count mapping(address => address) storage // delegatees list ) { if (delegationType == DelegationType.VOTING_POWER) { return (_votingSnapshots, _votingSnapshotsCounts, _votingDelegates); } else { return ( _propositionPowerSnapshots, _propositionPowerSnapshotsCounts, _propositionPowerDelegates ); } } /** * @dev Delegates specific governance power from signer to `delegatee` using an EIP-712 signature. * * @param delegatee The address to delegate votes to. * @param delegationType The type of delegation (VOTING_POWER, PROPOSITION_POWER). * @param nonce The signer's nonce for EIP-712 signatures on this contract. * @param expiry Expiration timestamp for the signature. * @param v Signature param. * @param r Signature param. * @param s Signature param. */ function delegateByTypeBySig( address delegatee, DelegationType delegationType, uint256 nonce, uint256 expiry, uint8 v, bytes32 r, bytes32 s ) public { bytes32 structHash = keccak256( abi.encode(DELEGATE_BY_TYPE_TYPEHASH, delegatee, uint256(delegationType), nonce, expiry) ); bytes32 digest = keccak256(abi.encodePacked('\x19\x01', DOMAIN_SEPARATOR, structHash)); address signer = ecrecover(digest, v, r, s); require(signer != address(0), 'INVALID_SIGNATURE'); require(nonce == _nonces[signer]++, 'INVALID_NONCE'); require(block.timestamp <= expiry, 'INVALID_EXPIRATION'); _delegateByType(signer, delegatee, delegationType); } /** * @dev Delegates both governance powers from signer to `delegatee` using an EIP-712 signature. * * @param delegatee The address to delegate votes to. * @param nonce The signer's nonce for EIP-712 signatures on this contract. * @param expiry Expiration timestamp for the signature. * @param v Signature param. * @param r Signature param. * @param s Signature param. */ function delegateBySig( address delegatee, uint256 nonce, uint256 expiry, uint8 v, bytes32 r, bytes32 s ) public { bytes32 structHash = keccak256(abi.encode(DELEGATE_TYPEHASH, delegatee, nonce, expiry)); bytes32 digest = keccak256(abi.encodePacked('\x19\x01', DOMAIN_SEPARATOR, structHash)); address signer = ecrecover(digest, v, r, s); require(signer != address(0), 'INVALID_SIGNATURE'); require(nonce == _nonces[signer]++, 'INVALID_NONCE'); require(block.timestamp <= expiry, 'INVALID_EXPIRATION'); _delegateByType(signer, delegatee, DelegationType.VOTING_POWER); _delegateByType(signer, delegatee, DelegationType.PROPOSITION_POWER); } }
// SPDX-License-Identifier: MIT pragma solidity 0.7.5; /** * @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) { // According to EIP-1052, 0x0 is the value returned for not-yet created accounts // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned // for accounts without code, i.e. `keccak256('')` bytes32 codehash; bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; // solhint-disable-next-line no-inline-assembly assembly { codehash := extcodehash(account) } return (codehash != accountHash && codehash != 0x0); } /** * @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'); } }
// SPDX-License-Identifier: MIT pragma solidity 0.7.5; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.5; import "../../interfaces/IERC20.sol"; import "./Context.sol"; import "./SafeMath.sol"; import "./Address.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20 { using SafeMath for uint256; using Address for address; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string internal _name; string internal _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name, string memory symbol) public { _name = name; _symbol = symbol; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() virtual public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() virtual public view returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is * called. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() virtual public view returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}; * * Requirements: * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens. * * This is internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal { _decimals = decimals_; } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } }
// SPDX-License-Identifier: MIT pragma solidity 0.7.5; import { IERC20 } from '../../interfaces/IERC20.sol'; import { SafeMath } from './SafeMath.sol'; import { Address } from './Address.sol'; /** * @title SafeERC20 * @dev From https://github.com/OpenZeppelin/openzeppelin-contracts * 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)); } function safeApprove( IERC20 token, address spender, uint256 value ) internal { 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 callOptionalReturn(IERC20 token, bytes memory data) private { require(address(token).isContract(), 'SafeERC20: call to non-contract'); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = address(token).call(data); require(success, '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 0.7.5; /** * @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, 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) { return sub(a, b, 'SafeMath: subtraction overflow'); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * 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); uint256 c = a - b; return c; } /** * @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) { // 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 0; } uint256 c = a * b; require(c / a == b, 'SafeMath: multiplication overflow'); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts 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) { return div(a, b, 'SafeMath: division by zero'); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage ) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts 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) { return mod(a, b, 'SafeMath: modulo by zero'); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message 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, string memory errorMessage ) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity 0.7.5; /** * @dev Interface of a bridge contract. */ interface IBridge { /** * @dev Emitted when a bridge event occurs. * * @param id Unique ID of the bridge event. * @param amount Amount of tokens bridged. * @param from The Ethereum address the tokens were transferred from. * @param accAddress The address to send to. * @param data Any arbitrary data. */ event Bridge( uint256 indexed id, uint256 amount, address from, bytes accAddress, bytes data ); /** * @notice Bridge a token. * * @param amount The amount of tokens to bridge * @param accAddress The address to send to. * @param memo Arbitrary memo to include in the event. */ function bridge( uint256 amount, bytes calldata accAddress, bytes calldata memo ) external; }
// SPDX-License-Identifier: AGPL-3.0 pragma solidity 0.7.5; import { ERC20 } from '../../dependencies/open-zeppelin/ERC20.sol'; import { SafeMath } from '../../dependencies/open-zeppelin/SafeMath.sol'; import { IGovernancePowerDelegationERC20 } from '../../interfaces/IGovernancePowerDelegationERC20.sol'; /** * @title GovernancePowerDelegationERC20Mixin * @author dYdX * * @notice Provides support for two types of governance powers, both endowed by the governance * token, and separately delegatable. Provides functions for delegation and for querying a user's * power at a certain block number. */ abstract contract GovernancePowerDelegationERC20Mixin is ERC20, IGovernancePowerDelegationERC20 { using SafeMath for uint256; // ============ Constants ============ /// @notice EIP-712 typehash for delegation by signature of a specific governance power type. bytes32 public constant DELEGATE_BY_TYPE_TYPEHASH = keccak256( 'DelegateByType(address delegatee,uint256 type,uint256 nonce,uint256 expiry)' ); /// @notice EIP-712 typehash for delegation by signature of all governance powers. bytes32 public constant DELEGATE_TYPEHASH = keccak256( 'Delegate(address delegatee,uint256 nonce,uint256 expiry)' ); // ============ Structs ============ /// @dev Snapshot of a value on a specific block, used to track voting power for proposals. struct Snapshot { uint128 blockNumber; uint128 value; } // ============ External Functions ============ /** * @notice Delegates a specific governance power to a delegatee. * * @param delegatee The address to delegate power to. * @param delegationType The type of delegation (VOTING_POWER, PROPOSITION_POWER). */ function delegateByType(address delegatee, DelegationType delegationType) external override { _delegateByType(msg.sender, delegatee, delegationType); } /** * @notice Delegates all governance powers to a delegatee. * * @param delegatee The address to delegate power to. */ function delegate(address delegatee) external override { _delegateByType(msg.sender, delegatee, DelegationType.VOTING_POWER); _delegateByType(msg.sender, delegatee, DelegationType.PROPOSITION_POWER); } /** * @notice Returns the delegatee of a user. * * @param delegator The address of the delegator. * @param delegationType The type of delegation (VOTING_POWER, PROPOSITION_POWER). */ function getDelegateeByType(address delegator, DelegationType delegationType) external override view returns (address) { (, , mapping(address => address) storage delegates) = _getDelegationDataByType(delegationType); return _getDelegatee(delegator, delegates); } /** * @notice Returns the current power of a user. The current power is the power delegated * at the time of the last snapshot. * * @param user The user whose power to query. * @param delegationType The type of power (VOTING_POWER, PROPOSITION_POWER). */ function getPowerCurrent(address user, DelegationType delegationType) external override view returns (uint256) { ( mapping(address => mapping(uint256 => Snapshot)) storage snapshots, mapping(address => uint256) storage snapshotsCounts, // delegates ) = _getDelegationDataByType(delegationType); return _searchByBlockNumber(snapshots, snapshotsCounts, user, block.number); } /** * @notice Returns the power of a user at a certain block. * * @param user The user whose power to query. * @param blockNumber The block number at which to get the user's power. * @param delegationType The type of power (VOTING_POWER, PROPOSITION_POWER). */ function getPowerAtBlock( address user, uint256 blockNumber, DelegationType delegationType ) external override view returns (uint256) { ( mapping(address => mapping(uint256 => Snapshot)) storage snapshots, mapping(address => uint256) storage snapshotsCounts, // delegates ) = _getDelegationDataByType(delegationType); return _searchByBlockNumber(snapshots, snapshotsCounts, user, blockNumber); } // ============ Internal Functions ============ /** * @dev Delegates one specific power to a delegatee. * * @param delegator The user whose power to delegate. * @param delegatee The address to delegate power to. * @param delegationType The type of power (VOTING_POWER, PROPOSITION_POWER). */ function _delegateByType( address delegator, address delegatee, DelegationType delegationType ) internal { require(delegatee != address(0), 'INVALID_DELEGATEE'); (, , mapping(address => address) storage delegates) = _getDelegationDataByType(delegationType); uint256 delegatorBalance = balanceOf(delegator); address previousDelegatee = _getDelegatee(delegator, delegates); delegates[delegator] = delegatee; _moveDelegatesByType(previousDelegatee, delegatee, delegatorBalance, delegationType); emit DelegateChanged(delegator, delegatee, delegationType); } /** * @dev Moves power from one user to another. * * @param from The user from which delegated power is moved. * @param to The user that will receive the delegated power. * @param amount The amount of power to be moved. * @param delegationType The type of power (VOTING_POWER, PROPOSITION_POWER). */ function _moveDelegatesByType( address from, address to, uint256 amount, DelegationType delegationType ) internal { if (from == to) { return; } ( mapping(address => mapping(uint256 => Snapshot)) storage snapshots, mapping(address => uint256) storage snapshotsCounts, // delegates ) = _getDelegationDataByType(delegationType); if (from != address(0)) { uint256 previous = 0; uint256 fromSnapshotsCount = snapshotsCounts[from]; if (fromSnapshotsCount != 0) { previous = snapshots[from][fromSnapshotsCount - 1].value; } else { previous = balanceOf(from); } uint256 newAmount = previous.sub(amount); _writeSnapshot( snapshots, snapshotsCounts, from, uint128(newAmount) ); emit DelegatedPowerChanged(from, newAmount, delegationType); } if (to != address(0)) { uint256 previous = 0; uint256 toSnapshotsCount = snapshotsCounts[to]; if (toSnapshotsCount != 0) { previous = snapshots[to][toSnapshotsCount - 1].value; } else { previous = balanceOf(to); } uint256 newAmount = previous.add(amount); _writeSnapshot( snapshots, snapshotsCounts, to, uint128(newAmount) ); emit DelegatedPowerChanged(to, newAmount, delegationType); } } /** * @dev Searches for a balance snapshot by block number using binary search. * * @param snapshots The mapping of snapshots by user. * @param snapshotsCounts The mapping of the number of snapshots by user. * @param user The user for which the snapshot is being searched. * @param blockNumber The block number being searched. */ function _searchByBlockNumber( mapping(address => mapping(uint256 => Snapshot)) storage snapshots, mapping(address => uint256) storage snapshotsCounts, address user, uint256 blockNumber ) internal view returns (uint256) { require(blockNumber <= block.number, 'INVALID_BLOCK_NUMBER'); uint256 snapshotsCount = snapshotsCounts[user]; if (snapshotsCount == 0) { return balanceOf(user); } // First check most recent balance if (snapshots[user][snapshotsCount - 1].blockNumber <= blockNumber) { return snapshots[user][snapshotsCount - 1].value; } // Next check implicit zero balance if (snapshots[user][0].blockNumber > blockNumber) { return 0; } uint256 lower = 0; uint256 upper = snapshotsCount - 1; while (upper > lower) { uint256 center = upper - (upper - lower) / 2; // ceil, avoiding overflow Snapshot memory snapshot = snapshots[user][center]; if (snapshot.blockNumber == blockNumber) { return snapshot.value; } else if (snapshot.blockNumber < blockNumber) { lower = center; } else { upper = center - 1; } } return snapshots[user][lower].value; } /** * @dev Returns delegation data (snapshot, snapshotsCount, delegates) by delegation type. * * Note: This mixin contract does not itself define any storage, and we require the inheriting * contract to implement this method to provide access to the relevant mappings in storage. * This pattern was implemented by Aave for legacy reasons and we have decided not to change it. * * @param delegationType The type of power (VOTING_POWER, PROPOSITION_POWER). */ function _getDelegationDataByType(DelegationType delegationType) internal virtual view returns ( mapping(address => mapping(uint256 => Snapshot)) storage, // snapshots mapping(address => uint256) storage, // snapshotsCount mapping(address => address) storage // delegates ); /** * @dev Writes a snapshot of a user's token/power balance. * * @param snapshots The mapping of snapshots by user. * @param snapshotsCounts The mapping of the number of snapshots by user. * @param owner The user whose power to snapshot. * @param newValue The new balance to snapshot at the current block. */ function _writeSnapshot( mapping(address => mapping(uint256 => Snapshot)) storage snapshots, mapping(address => uint256) storage snapshotsCounts, address owner, uint128 newValue ) internal { uint128 currentBlock = uint128(block.number); uint256 ownerSnapshotsCount = snapshotsCounts[owner]; mapping(uint256 => Snapshot) storage ownerSnapshots = snapshots[owner]; if ( ownerSnapshotsCount != 0 && ownerSnapshots[ownerSnapshotsCount - 1].blockNumber == currentBlock ) { // Doing multiple operations in the same block ownerSnapshots[ownerSnapshotsCount - 1].value = newValue; } else { ownerSnapshots[ownerSnapshotsCount] = Snapshot(currentBlock, newValue); snapshotsCounts[owner] = ownerSnapshotsCount + 1; } } /** * @dev Returns the delegatee of a user. If a user never performed any delegation, their * delegated address will be 0x0, in which case we return the user's own address. * * @param delegator The address of the user for which return the delegatee. * @param delegates The mapping of delegates for a particular type of delegation. */ function _getDelegatee( address delegator, mapping(address => address) storage delegates ) internal view returns (address) { address previousDelegatee = delegates[delegator]; if (previousDelegatee == address(0)) { return delegator; } return previousDelegatee; } }
// SPDX-License-Identifier: MIT pragma solidity 0.7.5; /** * @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: AGPL-3.0 pragma solidity 0.7.5; interface IGovernancePowerDelegationERC20 { enum DelegationType { VOTING_POWER, PROPOSITION_POWER } /** * @dev Emitted when a user delegates governance power to another user. * * @param delegator The delegator. * @param delegatee The delegatee. * @param delegationType The type of delegation (VOTING_POWER, PROPOSITION_POWER). */ event DelegateChanged( address indexed delegator, address indexed delegatee, DelegationType delegationType ); /** * @dev Emitted when an action changes the delegated power of a user. * * @param user The user whose delegated power has changed. * @param amount The new amount of delegated power for the user. * @param delegationType The type of delegation (VOTING_POWER, PROPOSITION_POWER). */ event DelegatedPowerChanged(address indexed user, uint256 amount, DelegationType delegationType); /** * @dev Delegates a specific governance power to a delegatee. * * @param delegatee The address to delegate power to. * @param delegationType The type of delegation (VOTING_POWER, PROPOSITION_POWER). */ function delegateByType(address delegatee, DelegationType delegationType) external virtual; /** * @dev Delegates all governance powers to a delegatee. * * @param delegatee The user to which the power will be delegated. */ function delegate(address delegatee) external virtual; /** * @dev Returns the delegatee of an user. * * @param delegator The address of the delegator. * @param delegationType The type of delegation (VOTING_POWER, PROPOSITION_POWER). */ function getDelegateeByType(address delegator, DelegationType delegationType) external view virtual returns (address); /** * @dev Returns the current delegated power of a user. The current power is the power delegated * at the time of the last snapshot. * * @param user The user whose power to query. * @param delegationType The type of power (VOTING_POWER, PROPOSITION_POWER). */ function getPowerCurrent(address user, DelegationType delegationType) external view virtual returns (uint256); /** * @dev Returns the delegated power of a user at a certain block. * * @param user The user whose power to query. * @param blockNumber The block number at which to get the user's power. * @param delegationType The type of power (VOTING_POWER, PROPOSITION_POWER). */ function getPowerAtBlock( address user, uint256 blockNumber, DelegationType delegationType ) external view virtual returns (uint256); }
{ "optimizer": { "enabled": true, "runs": 200 }, "evmVersion": "berlin", "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000092d6c1e31e14520e676a687f0a93788b716beff5
-----Decoded View---------------
Arg [0] : tokenAddress (address): 0x92D6C1e31e14520e676a687F0a93788B716BEff5
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000092d6c1e31e14520e676a687f0a93788b716beff5
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