Address Details
contract
0x25741B41C48C6A9c09BbB3aB2eb0C4A6f5f41205
- Contract Name
- BasketService
- Creator
- 0x07ff8b–54f774 at 0x30f420–18445f
- Balance
- 0 CELO ( )
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
- Tokens
-
Fetching tokens...
- Transactions
- 9 Transactions
- Transfers
- 2 Transfers
- Gas Used
- 1,239,147
- Last Balance Update
- 13679057
Transactions
Token Transfers
Tokens
Internal Transactions
Coin Balance History
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- Contract name:
- BasketService
- Optimization enabled
- false
- Compiler version
- v0.8.13+commit.abaa5c0e
- EVM Version
- london
- Verified at
- 2022-09-30T08:30:32.872642Z
contracts/BasketService.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0 <0.9.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "./ExchangeRateService.sol"; import "./Nylon.sol"; /** * @dev Implementation of the basket service smart contract. * * The {BaskeService} smart contract receives cryptocurrencies and in exchange will trigger * the minting process of Nylon. The value of a Nylon is determined by the value of * the cryptocurrencies held by the contract. * * It inherits from the Ownable interfaces of the openzeppelin contracts collection. * * Ownable means that someone "owns" the BasketService. This may be a person or an other smart * contract. * * NOTE: For now, the basket service can only hold cUSD and cEUR. */ contract BasketService is Ownable, ReentrancyGuard { using SafeERC20 for IERC20; using SafeERC20 for Nylon; // ERC20-tokens: cUSD and cEUR IERC20 private immutable cUSD; IERC20 private immutable cEUR; // the Nylon Nylon private immutable nylon; // the exchange rate service ExchangeRateService public exchange; /** * @dev The {NylonTransferred} event is emitted once Nylon are minted. */ event NylonTransferred(address indexed _to, uint256 _amount); /** * @dev The {NylonRemoved} event is emitted once Nylon are burnt. */ event NylonRemoved(address indexed _from, uint256 _amount); /** * @dev Constructor of the basket service. * * Requirements: * - the address of the Nylon. */ constructor(Nylon _nylon) { address _cUSD = 0x874069Fa1Eb16D44d622F2e0Ca25eeA172369bC1; address _cEUR = 0x10c892A6EC43a53E45D0B916B4b7D383B1b78C0F; // init of the Nylon nylon = _nylon; // erc20-token cUSD (https://alfajores-blockscout.celo-testnet.org/token/0x874069Fa1Eb16D44d622F2e0Ca25eeA172369bC1) cUSD = IERC20(_cUSD); // erc20-token cEUR (https://alfajores-blockscout.celo-testnet.org/token/0x10c892A6EC43a53E45D0B916B4b7D383B1b78C0F) cEUR = IERC20(_cEUR); } /** * @dev The objective of the function is to improve legibility. * It returns the address of the basket service. * * {_basket} is only used for internal purposes. */ function _basket() internal view virtual returns (address) { return address(this); } /** * @dev {_basketEvaluation} returns a number of variables needed for the computation of {sellNylon}. * * Returns: * - `nylonTtlSupply`, total supply of Nylon in circulation * - `cUSDBasketBalance`, cUSD balance of the basket * - `cEURBasketBalance`, cEUR balance of the basket */ function _evaluation() public view virtual returns ( uint256 nylonTtlSupply, uint256 cUSDBasketBalance, uint256 cEURBasketBalance ) { nylonTtlSupply = nylon.totalSupply(); cUSDBasketBalance = cUSD.balanceOf(_basket()); cEURBasketBalance = cEUR.balanceOf(_basket()); } /** * @dev Setter function for the external exchange rate service. * * Requirements: * - the address of the exchange rate service. * * NOTE: This function is only callable by the owner. */ function setExchangeRateService(ExchangeRateService _exchangeRateService) external onlyOwner { exchange = _exchangeRateService; } /** * @dev Nylon can be bought by x-amount. These nylon are directly minted to * the sender address. * * Prerequisites: * - allowance of the cUSD must match the current Nylon value returned by the exchange rate service. * - allowance of the cEUR must match the current Nylon value returned by the exchange rate service. * * Requirements: * - '_amount', requested amount of Nylon (must be at least 0.001). */ function buyNylon(uint256 _amount) external nonReentrant returns (bool) { (uint256 cUSDAmount, uint256 cEURAmount) = exchange._nylonValue( _amount ); require( _amount >= 10**15, "Exchanged amount needs to be at least 0.001!" ); require( cUSD.allowance(_msgSender(), _basket()) >= cUSDAmount && cEUR.allowance(_msgSender(), _basket()) >= cEURAmount, "Approve cUSD and cEUR tokens first!" ); cUSD.safeTransferFrom(_msgSender(), _basket(), cUSDAmount); cEUR.safeTransferFrom(_msgSender(), _basket(), cEURAmount); nylon.increaseSupply(_msgSender(), _amount); emit NylonTransferred(_msgSender(), _amount); return true; } /** * @dev Nylon can be sold by x-amount. These nylon are directly burnt from * the sender address. * * Prerequisites: * - Nylon balance must be equal or above the desired sold amount. * * Requirements: * - '_amount', requested amount of Nylon (must be at least 0.001). */ function sellNylon(uint256 _amount) external nonReentrant returns (bool) { require( nylon.balanceOf(_msgSender()) >= _amount, "Nylon balance of sender is insufficient!" ); (uint256 cUSDAmount, uint256 cEURAmount) = exchange._nylonValue( _amount ); nylon.decreaseSupply(_msgSender(), _amount); cUSD.safeTransfer(_msgSender(), cUSDAmount); cEUR.safeTransfer(_msgSender(), cEURAmount); emit NylonRemoved(_msgSender(), _amount); return true; } }
/_openzeppelin/contracts/access/Ownable.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
/_openzeppelin/contracts/security/ReentrancyGuard.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol) pragma solidity ^0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor() { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and making it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
/_openzeppelin/contracts/token/ERC20/ERC20.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.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 Contracts guidelines: functions revert * instead 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, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override 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 this function is * overridden; * * 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() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, 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}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, 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}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, amount); 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) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, spender) + 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) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * This 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: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer( address from, address to, uint256 amount ) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; } _balances[to] += amount; emit Transfer(from, to, amount); _afterTokenTransfer(from, to, 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: * * - `account` 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 += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); _afterTokenTransfer(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); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This 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 Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @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 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 {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
/_openzeppelin/contracts/token/ERC20/IERC20.sol
// 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); }
/_openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol
// 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); }
/_openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol
// 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); }
/_openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (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"); } } }
/_openzeppelin/contracts/utils/Address.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (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 functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason 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 { // 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); } } } }
/_openzeppelin/contracts/utils/Context.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with 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) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
/_openzeppelin/contracts/utils/math/SafeMath.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol) pragma solidity ^0.8.0; // CAUTION // This version of SafeMath should only be used with Solidity 0.8 or later, // because it relies on the compiler's built in overflow checks. /** * @dev Wrappers over Solidity's arithmetic operations. * * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler * now has built in overflow checking. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } } /** * @dev Returns the subtraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b > a) return (false, 0); return (true, a - b); } } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a / b); } } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a % b); } } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { return a + b; } /** * @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 a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { return a * b; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { unchecked { require(b <= a, errorMessage); return a - b; } } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * 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) { unchecked { require(b > 0, errorMessage); return a / b; } } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a % b; } } }
/ado-contracts/contracts/interfaces/IERC2362.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.5.0 <0.9.0; /** * @dev EIP2362 Interface for pull oracles * https://github.com/adoracles/EIPs/blob/erc-2362/EIPS/eip-2362.md */ interface IERC2362 { /** * @dev Exposed function pertaining to EIP standards * @param _id bytes32 ID of the query * @return int,uint,uint returns the value, timestamp, and status code of query */ function valueFor(bytes32 _id) external view returns(int256,uint256,uint256); }
/contracts/ExchangeRateService.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0 <0.9.0; import "witnet-solidity-bridge/contracts/interfaces/IWitnetPriceRouter.sol"; import "witnet-solidity-bridge/contracts/interfaces/IWitnetPriceFeed.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/utils/math/SafeMath.sol"; import "./BasketService.sol"; import "./Maths.sol"; /** * @dev Implementation of the exchange rate service smart contract. */ contract ExchangeRateService { using SafeERC20 for IERC20; using Maths for uint256; // ERC20-tokens: cUSD and cEUR IERC20 private immutable cUSD; IERC20 private immutable cEUR; // BasketService BasketService public immutable basket; // IWitnetPriceRouter // see {https://docs.witnet.io/smart-contracts/witnet-data-feeds/addresses/celo} IWitnetPriceRouter public immutable witnetPriceRouter; // IWitnetPriceFeeds: CELO/USD and CELO/EUR IWitnetPriceFeed private celoUsd; IWitnetPriceFeed private celoEur; /** * @dev Constructor of the exchange service. * The Witnet price router and the required price feeds are initialized. * * Requirements: * - the address of the price router. */ constructor(BasketService _basketService, IWitnetPriceRouter _priceRouter) { address _cUSD = 0x874069Fa1Eb16D44d622F2e0Ca25eeA172369bC1; address _cEUR = 0x10c892A6EC43a53E45D0B916B4b7D383B1b78C0F; // erc20-token cUSD (https://alfajores-blockscout.celo-testnet.org/token/0x874069Fa1Eb16D44d622F2e0Ca25eeA172369bC1) cUSD = IERC20(_cUSD); // erc20-token cEUR (https://alfajores-blockscout.celo-testnet.org/token/0x10c892A6EC43a53E45D0B916B4b7D383B1b78C0F) cEUR = IERC20(_cEUR); basket = _basketService; witnetPriceRouter = _priceRouter; // price feeds (https://docs.witnet.io/smart-contracts/witnet-data-feeds/price-feeds-registry) celoUsd = addPriceFeed(0x9ed884be); celoEur = addPriceFeed(0x21a79821); } /** * @dev Helper function which allows to get a price feed corresponding to the erc2362 id. * * Requirements: * - the erc2362 id of the price feed, see {https://docs.witnet.io/smart-contracts/witnet-data-feeds/addresses/celo}. */ function addPriceFeed(bytes4 _erc2362id) internal view virtual returns (IWitnetPriceFeed priceFeed) { IERC165 erc165 = witnetPriceRouter.getPriceFeed(bytes4(_erc2362id)); require( address(erc165) != address(0), "Failed to add price feed. Price feed address is invalid!" ); priceFeed = IWitnetPriceFeed(address(erc165)); } /** * @dev Evaluates the current exchange rate of the cUSD to the cEUR by dividing * the CELO/EUR-price with the CELO/USD-price. * * Returns: * - `usdEurRate`, exchange rate of USD/EUR */ function _usdEurRate() public view returns (uint256 usdEurRate) { uint256 celoEurLastPrice = uint256(celoEur.lastPrice()); uint256 celoUsdLastPrice = uint256(celoUsd.lastPrice()); (, , usdEurRate) = celoEurLastPrice.floatingPointDivision( celoUsdLastPrice ); } /** * @dev Evaluates the value of x-amount of Nylon. * * Requirements: * - '_amount', requested amount of Nylon. * Returns: * - `cUSDAmount`, amount of cUSD needed for x-amount of Nylon * - `cEURAmount`, amount of cEUR needed for x-amount of Nylon */ function _nylonValue(uint256 _amount) public view returns (uint256 cUSDAmount, uint256 cEURAmount) { uint256 factor = Maths.factor; uint256 usdEurRate = _usdEurRate(); ( uint256 cEURBasketBalance, uint256 cUSDBasketBalance, uint256 nylonTtlSupply ) = basket._evaluation(); if (nylonTtlSupply == 0) { uint256 squaredAmount = (_amount * _amount) / factor; (, , uint256 requestedAmount) = squaredAmount.floatingPointDivision( usdEurRate ); cEURAmount = requestedAmount.squareRoot(); cUSDAmount = (cEURAmount * usdEurRate) / factor; } else { (, , uint256 cUSDBasketValueInEUR) = cUSDBasketBalance .floatingPointDivision(usdEurRate); (, , uint256 nylonPercentage) = _amount.floatingPointDivision( nylonTtlSupply ); uint256 addedValueInEUR = (nylonPercentage * (cUSDBasketValueInEUR + cEURBasketBalance)) / factor; cUSDAmount = (addedValueInEUR * usdEurRate) / 2 / factor; (, , cEURAmount) = addedValueInEUR.floatingPointDivision( 2 * factor ); } } }
/contracts/Maths.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0 <0.9.0; import "@openzeppelin/contracts/utils/math/SafeMath.sol"; library Maths { using SafeMath for uint256; uint256 public constant factor = 10**18; modifier notNull(uint256 _value) { require(_value > 0, "Input parameter needs to be above 0."); _; } function floatingPointDivision(uint256 _numerator, uint256 _denominator) internal pure notNull(_denominator) returns ( uint256 quotient, uint256 rest, uint256 result ) { quotient = _numerator.div(_denominator); rest = ((_numerator * factor) / _denominator) % factor; bool rounding = 2 * ((_numerator * factor) % _denominator) >= _denominator; if (rounding) { rest += 1; } result = quotient.mul(factor) + rest; } function squareRoot(uint256 y) internal pure returns (uint256 z) { y = y * factor; if (y > 3) { z = y; uint256 x = y / 2 + 1; while (x < z) { z = x; x = (y / x + x) / 2; } } } }
/contracts/Nylon.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0 <0.9.0; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; /** * @dev Implementation of the Nylon ERC20 Token. * * It inherits from the ERC20 and Ownable interface of the openzeppelin * contracts collection. * * Ownable means that someone "owns" the Nylon. This may be a person or an other smart * contract. */ contract Nylon is ERC20, Ownable { /** * Token-name: Nylon * Token-symbol: nylon */ constructor() ERC20("Nylon", "nylon") {} /** * @dev Nylon can be increased by x-amount. * * {increaseSupply} is only callable by the the contract owner. * * Requirements: * * - `_to`, address to which the Nylon are minted. * - `_amount`, amount of Nylon minted. * * NOTE: To ensure that this function cannot be called by a person, the ownership * should be transferred to the address of an other contract. * See {BasketService}. */ function increaseSupply(address _to, uint256 _amount) external onlyOwner returns (bool) { _mint(_to, _amount); return true; } /** * @dev Nylon can be decreased by x-amount. * * {decreaseSupply} is only callable by the the contract owner. * * Requirements: * * - `_from`, address from which the Nylon are burnt. * - `_amount`, amount of Nylon burnt. * * NOTE: To ensure that this function cannot be called by a person, the ownership * should be transferred to the address of an other contract. * See {BasketService}. */ function decreaseSupply(address _from, uint256 _amount) external onlyOwner returns (bool) { _burn(_from, _amount); return true; } }
/witnet-solidity-bridge/contracts/interfaces/IERC165.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.7.0 <0.9.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
/witnet-solidity-bridge/contracts/interfaces/IWitnetPriceFeed.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.7.0 <0.9.0; pragma experimental ABIEncoderV2; /// @title The Witnet Price Feed basic interface. /// @dev Guides implementation of active price feed polling contracts. /// @author The Witnet Foundation. interface IWitnetPriceFeed { /// Signals that a new price update request is being posted to the Witnet Request Board event PriceFeeding(address indexed from, uint256 queryId, uint256 extraFee); /// Estimates minimum fee amount in native currency to be paid when /// requesting a new price update. /// @dev Actual fee depends on the gas price of the `requestUpdate()` transaction. /// @param _gasPrice Gas price expected to be paid when calling `requestUpdate()` function estimateUpdateFee(uint256 _gasPrice) external view returns (uint256); /// Returns result of the last valid price update request successfully solved by the Witnet oracle. function lastPrice() external view returns (int256); /// Returns the EVM-timestamp when last valid price was reported back from the Witnet oracle. function lastTimestamp() external view returns (uint256); /// Returns tuple containing last valid price and timestamp, as well as status code of latest update /// request that got posted to the Witnet Request Board. /// @return _lastPrice Last valid price reported back from the Witnet oracle. /// @return _lastTimestamp EVM-timestamp of the last valid price. /// @return _lastDrTxHash Hash of the Witnet Data Request that solved the last valid price. /// @return _latestUpdateStatus Status code of the latest update request. function lastValue() external view returns ( int _lastPrice, uint _lastTimestamp, bytes32 _lastDrTxHash, uint _latestUpdateStatus ); /// Returns identifier of the latest update request posted to the Witnet Request Board. function latestQueryId() external view returns (uint256); /// Returns hash of the Witnet Data Request that solved the latest update request. /// @dev Returning 0 while the latest update request remains unsolved. function latestUpdateDrTxHash() external view returns (bytes32); /// Returns error message of latest update request posted to the Witnet Request Board. /// @dev Returning empty string if the latest update request remains unsolved, or /// @dev if it was succesfully solved with no errors. function latestUpdateErrorMessage() external view returns (string memory); /// Returns status code of latest update request posted to the Witnet Request Board: /// @dev Status codes: /// @dev - 200: update request was succesfully solved with no errors /// @dev - 400: update request was solved with errors /// @dev - 404: update request was not solved yet function latestUpdateStatus() external view returns (uint256); /// Returns `true` if latest update request posted to the Witnet Request Board /// has not been solved yet by the Witnet oracle. function pendingUpdate() external view returns (bool); /// Posts a new price update request to the Witnet Request Board. Requires payment of a fee /// that depends on the value of `tx.gasprice`. See `estimateUpdateFee(uint256)`. /// @dev If previous update request was not solved yet, calling this method again allows /// @dev upgrading the update fee if called with a higher `tx.gasprice` value. function requestUpdate() external payable; /// Tells whether this contract implements the interface defined by `interfaceId`. /// @dev See the corresponding https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] /// @dev to learn more about how these ids are created. function supportsInterface(bytes4) external view returns (bool); }
/witnet-solidity-bridge/contracts/interfaces/IWitnetPriceRouter.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.7.0 <0.9.0; pragma experimental ABIEncoderV2; import "ado-contracts/contracts/interfaces/IERC2362.sol"; import "./IERC165.sol"; /// @title The Witnet Price Router basic interface. /// @dev Guides implementation of price feeds aggregation contracts. /// @author The Witnet Foundation. abstract contract IWitnetPriceRouter is IERC2362 { /// Emitted everytime a currency pair is attached to a new price feed contract /// @dev See https://github.com/adoracles/ADOIPs/blob/main/adoip-0010.md /// @dev to learn how these ids are created. event CurrencyPairSet(bytes32 indexed erc2362ID, IERC165 pricefeed); /// Helper pure function: returns hash of the provided ERC2362-compliant currency pair caption (aka ID). function currencyPairId(string memory) external pure virtual returns (bytes32); /// Returns the ERC-165-compliant price feed contract currently serving /// updates on the given currency pair. function getPriceFeed(bytes32 _erc2362id) external view virtual returns (IERC165); /// Returns human-readable ERC2362-based caption of the currency pair being /// served by the given price feed contract address. /// @dev Should fail if the given price feed contract address is not currently /// @dev registered in the router. function getPriceFeedCaption(IERC165) external view virtual returns (string memory); /// Returns human-readable caption of the ERC2362-based currency pair identifier, if known. function lookupERC2362ID(bytes32 _erc2362id) external view virtual returns (string memory); /// Register a price feed contract that will serve updates for the given currency pair. /// @dev Setting zero address to a currency pair implies that it will not be served any longer. /// @dev Otherwise, should fail if the price feed contract does not support the `IWitnetPriceFeed` interface, /// @dev or if given price feed is already serving another currency pair (within this WitnetPriceRouter instance). function setPriceFeed( IERC165 _pricefeed, uint256 _decimals, string calldata _base, string calldata _quote ) external virtual; /// Returns list of known currency pairs IDs. function supportedCurrencyPairs() external view virtual returns (bytes32[] memory); /// Returns `true` if given pair is currently being served by a compliant price feed contract. function supportsCurrencyPair(bytes32 _erc2362id) external view virtual returns (bool); /// Returns `true` if given price feed contract is currently serving updates to any known currency pair. function supportsPriceFeed(IERC165 _priceFeed) external view virtual returns (bool); }
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_nylon","internalType":"contract Nylon"}]},{"type":"event","name":"NylonRemoved","inputs":[{"type":"address","name":"_from","internalType":"address","indexed":true},{"type":"uint256","name":"_amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"NylonTransferred","inputs":[{"type":"address","name":"_to","internalType":"address","indexed":true},{"type":"uint256","name":"_amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"nylonTtlSupply","internalType":"uint256"},{"type":"uint256","name":"cUSDBasketBalance","internalType":"uint256"},{"type":"uint256","name":"cEURBasketBalance","internalType":"uint256"}],"name":"_evaluation","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"buyNylon","inputs":[{"type":"uint256","name":"_amount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract ExchangeRateService"}],"name":"exchange","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"renounceOwnership","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"sellNylon","inputs":[{"type":"uint256","name":"_amount","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setExchangeRateService","inputs":[{"type":"address","name":"_exchangeRateService","internalType":"contract ExchangeRateService"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]}]
Contract Creation Code
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