Address Details
contract

0x9F9037cE8deB6e8EF3045aD5C1a31D93895446C4

Contract Name
CeloProxyPriceProvider
Creator
0xac4b96–fcb761 at 0xed629b–11d98d
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
2 Transactions
Transfers
0 Transfers
Gas Used
14,570
Last Balance Update
25323413
This contract has been verified via Sourcify. View contract in Sourcify repository
Contract name:
CeloProxyPriceProvider




Optimization enabled
false
Compiler version
v0.6.12+commit.27d51765




EVM Version
istanbul




Verified at
2022-04-12T22:24:03.093246Z

contracts/CeloProxyPriceProviderFlattened.sol

pragma solidity 0.6.12;

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;
  }
}

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;
  }
}
/**
 * @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.
 */
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() internal {
    address msgSender = _msgSender();
    _owner = msgSender;
    emit OwnershipTransferred(address(0), msgSender);
  }

  /**
   * @dev Returns the address of the current owner.
   */
  function owner() public view returns (address) {
    return _owner;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    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 {
    emit OwnershipTransferred(_owner, address(0));
    _owner = 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');
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

interface IPriceOracleGetter {
  /**
   * @dev returns the asset price in ETH
   * @param asset the address of the asset
   * @return the ETH price of the asset
   **/
  function getAssetPrice(address asset) external view returns (uint256);
}

interface IPriceFeed {

    // note this will always return 0 before update has been called successfully for the first time.
    function consult() external view returns (uint);

}

interface IRegistry {
  function getAddressForOrDie(bytes32) external view returns (address);
}

/// @title CeloProxyPriceProvider
/// @author Moola
/// @notice Proxy smart contract to get the price of an asset from a price source, with Celo SortedOracles
///         smart contracts as primary option
/// - If the returned price by a SortedOracles is <= 0, the call is forwarded to a fallbackOracle
/// - Owned by the Moola governance system, allowed to add sources for assets, replace them
///   and change the fallbackOracle

contract CeloProxyPriceProvider is IPriceOracleGetter, Ownable {
  using SafeMath for uint256;

  mapping(address => address) internal priceFeeds;
  IRegistry public immutable registry;

  constructor(
    address[] memory _assets,
    address[] memory _priceFeeds,
    address _registry
  ) public {
    updateAssets(_assets, _priceFeeds);
    registry = IRegistry(_registry);
  }

  function updateAssets(address[] memory _assets, address[] memory _priceFeeds) public onlyOwner {
    require(_assets.length == _priceFeeds.length, 'the quantity does not match');

    for (uint256 i = 0; i < _assets.length; i++) {
      priceFeeds[_assets[i]] = _priceFeeds[i];
    }
  }

  /// @notice Gets an asset price by address
  /// @param _asset The asset address
  function getAssetPrice(address _asset) public view override returns (uint256) {
    if (_asset == registry.getAddressForOrDie(keccak256(abi.encodePacked('GoldToken')))) {
      return 1 ether;
    }

    return (IPriceFeed(priceFeeds[_asset]).consult());
  }

  /// @notice Gets a list of prices from a list of assets addresses
  /// @param _assets The list of assets addresses
  function getAssetsPrices(address[] memory _assets) public view returns (uint256[] memory) {
    uint256[] memory prices = new uint256[](_assets.length);
    for (uint256 i = 0; i < _assets.length; i++) {
      prices[i] = getAssetPrice(_assets[i]);
    }

    return prices;
  }

  /// @notice Gets the address of the fallback oracle
  /// @return address The addres of the fallback oracle
  function getPriceFeed(address _asset) public view returns (address) {
    return (priceFeeds[_asset]);
  }
}

Contract ABI

[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address[]","name":"_assets","internalType":"address[]"},{"type":"address[]","name":"_priceFeeds","internalType":"address[]"},{"type":"address","name":"_registry","internalType":"address"}]},{"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":"","internalType":"uint256"}],"name":"getAssetPrice","inputs":[{"type":"address","name":"_asset","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256[]","name":"","internalType":"uint256[]"}],"name":"getAssetsPrices","inputs":[{"type":"address[]","name":"_assets","internalType":"address[]"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"getPriceFeed","inputs":[{"type":"address","name":"_asset","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IRegistry"}],"name":"registry","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"renounceOwnership","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateAssets","inputs":[{"type":"address[]","name":"_assets","internalType":"address[]"},{"type":"address[]","name":"_priceFeeds","internalType":"address[]"}]}]

Contract Creation Code

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