ResilientOracle

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _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);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}
"
    },
    "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.1) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}
"
    },
    "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}
"
    },
    "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}
"
    },
    "contracts/oracle/interfaces/OracleInterface.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

interface OracleInterface {
  function peek(address asset) external view returns (uint256);
}

interface IAPI3Proxy {
  function read()
  external
  view
  returns (int224 value, uint32 timestamp);
}

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

  function description() external view returns (string memory);

  function version() external view returns (uint256);

  function latestAnswer() external view returns (int256);

  function getRoundData(uint80 _roundId)
  external
  view
  returns (
    uint80 roundId,
    int256 answer,
    uint256 startedAt,
    uint256 updatedAt,
    uint80 answeredInRound
  );

  function latestRoundData()
  external
  view
  returns (
    uint80 roundId,
    int256 answer,
    uint256 startedAt,
    uint256 updatedAt,
    uint80 answeredInRound
  );
}

interface BoundValidatorInterface {
  function validatePriceWithAnchorPrice(
    address asset,
    uint256 reporterPrice,
    uint256 anchorPrice
  ) external view returns (bool);
}

"
    },
    "contracts/oracle/ResilientOracle.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "./interfaces/OracleInterface.sol";

/**
 * @title ResilientOracle
 * @author Lista
 * @notice The Resilient Oracle is the main contract that the protocol uses to fetch prices of assets.
 *
 * The Resilient Oracle uses multiple sources and fallback mechanisms to provide accurate prices and protect
 * the protocol from oracle attacks.
 *
 * For every market (vToken) we configure the main, pivot and fallback oracles. The oracles are configured per
 * vToken's underlying asset address. The main oracle oracle is the most trustworthy price source, the pivot
 * oracle is used as a loose sanity checker and the fallback oracle is used as a backup price source.
 *
 * To validate prices returned from two oracles, we use an upper and lower bound ratio that is set for every
 * market. The upper bound ratio represents the deviation between reported price (the price that’s being
 * validated) and the anchor price (the price we are validating against) above which the reported price will
 * be invalidated. The lower bound ratio presents the deviation between reported price and anchor price below
 * which the reported price will be invalidated. So for oracle price to be considered valid the below statement
 * should be true:

```
anchorRatio = anchorPrice/reporterPrice
isValid = anchorRatio <= upperBoundAnchorRatio && anchorRatio >= lowerBoundAnchorRatio
```

 *
 * For a fetched price to be valid it must be positive and not stagnant. If the price is invalid then we consider the
 * oracle to be stagnant and treat it like it's disabled.
 */
contract ResilientOracle is OwnableUpgradeable, OracleInterface {
  /**
   * @dev Oracle roles:
     * **main**: The most trustworthy price source
     * **pivot**: Price oracle used as a loose sanity checker
     * **fallback**: The backup source when main oracle price is invalidated
     */
  enum OracleRole {
    MAIN,
    PIVOT,
    FALLBACK
  }

  struct TokenConfig {
    /// @notice asset address
    address asset;
    /// @notice `oracles` stores the oracles based on their role in the following order:
    /// [main, pivot, fallback],
    /// It can be indexed with the corresponding enum OracleRole value
    address[3] oracles;
    /// @notice `enableFlagsForOracles` stores the enabled state
    /// for each oracle in the same order as `oracles`
    bool[3] enableFlagsForOracles;
    /// @notice `timeDeltaTolerance` stores the tolerance of
    /// the difference between the block timestamp and the price update time
    /// the unit is seconds
    uint256 timeDeltaTolerance;
  }

  uint256 public constant INVALID_PRICE = 0;

  /// @notice Bound validator contract address
  BoundValidatorInterface public boundValidator;

  mapping(address => TokenConfig) private tokenConfigs;

  event TokenConfigAdded(
    address indexed asset,
    address indexed mainOracle,
    address indexed pivotOracle,
    address fallbackOracle,
    uint256 timeDeltaTolerance
  );

  /// Event emitted when an oracle is set
  event OracleSet(address indexed asset, address indexed oracle, uint256 indexed role);

  /// Event emitted when an oracle is enabled or disabled
  event OracleEnabled(address indexed asset, uint256 indexed role, bool indexed enable);

  /**
   * @notice Checks whether an address is null or not
     */
  modifier notNullAddress(address someone) {
    if (someone == address(0)) revert("can't be zero address");
    _;
  }

  /**
   * @notice Checks whether token config exists by checking whether asset is null address
     * @dev address can't be null, so it's suitable to be used to check the validity of the config
     * @param asset asset address
     */
  modifier checkTokenConfigExistence(address asset) {
    if (tokenConfigs[asset].asset == address(0)) revert("token config must exist");
    _;
  }

  /// @notice Initializes the contract
  function initialize(BoundValidatorInterface _boundValidator) public initializer {
    __Ownable_init();
    boundValidator = _boundValidator;
  }

  /**
   * @notice Batch sets token configs
     * @param tokenConfigs_ Token config array
     * @custom:access Only Governance
     * @custom:error Throws a length error if the length of the token configs array is 0
     */
  function setTokenConfigs(TokenConfig[] memory tokenConfigs_) external {
    if (tokenConfigs_.length == 0) revert("length can't be 0");
    uint256 numTokenConfigs = tokenConfigs_.length;
    for (uint256 i; i < numTokenConfigs; ) {
      setTokenConfig(tokenConfigs_[i]);
      unchecked {
        ++i;
      }
    }
  }

  /**
   * @notice Sets oracle for a given asset and role.
     * @dev Supplied asset **must** exist and main oracle may not be null
     * @param asset Asset address
     * @param oracle Oracle address
     * @param role Oracle role
     * @custom:access Only Governance
     * @custom:error Null address error if main-role oracle address is null
     * @custom:error NotNullAddress error is thrown if asset address is null
     * @custom:error TokenConfigExistence error is thrown if token config is not set
     * @custom:event Emits OracleSet event with asset address, oracle address and role of the oracle for the asset
     */
  function setOracle(
    address asset,
    address oracle,
    OracleRole role
  ) external onlyOwner notNullAddress(asset) checkTokenConfigExistence(asset) {
    if (oracle == address(0) && role == OracleRole.MAIN) revert("can't set zero address to main oracle");
    tokenConfigs[asset].oracles[uint256(role)] = oracle;
    emit OracleSet(asset, oracle, uint256(role));
  }

  /**
   * @notice Enables/ disables oracle for the input asset. Token config for the input asset **must** exist
     * @dev Configuration for the asset **must** already exist and the asset cannot be 0 address
     * @param asset Asset address
     * @param role Oracle role
     * @param enable Enabled boolean of the oracle
     * @custom:access Only Governance
     * @custom:error NotNullAddress error is thrown if asset address is null
     * @custom:error TokenConfigExistence error is thrown if token config is not set
     */
  function enableOracle(
    address asset,
    OracleRole role,
    bool enable
  ) external onlyOwner notNullAddress(asset) checkTokenConfigExistence(asset) {
    tokenConfigs[asset].enableFlagsForOracles[uint256(role)] = enable;
    emit OracleEnabled(asset, uint256(role), enable);
  }

  /**
   * @dev Gets token config by asset address
     * @param asset asset address
     * @return tokenConfig Config for the asset
     */
  function getTokenConfig(address asset) external view returns (TokenConfig memory) {
    return tokenConfigs[asset];
  }

  /**
   * @notice Gets price of the asset
     * @param asset asset address
     * @return price USD price in scaled decimal places.
     * @custom:error Paused error is thrown when resilent oracle is paused
     * @custom:error Invalid resilient oracle price error is thrown if fetched prices from oracle is invalid
     */
  function peek(address asset) external view override returns (uint256) {
    return _getPrice(asset);
  }

  /**
   * @notice Sets/resets single token configs.
     * @dev main oracle **must not** be a null address
     * @param tokenConfig Token config struct
     * @custom:access Only Governance
     * @custom:error NotNullAddress is thrown if asset address is null
     * @custom:error NotNullAddress is thrown if main-role oracle address for asset is null
     * @custom:event Emits TokenConfigAdded event when the asset config is set successfully by the authorized account
     */
  function setTokenConfig(
    TokenConfig memory tokenConfig
  ) public onlyOwner notNullAddress(tokenConfig.asset) notNullAddress(tokenConfig.oracles[uint256(OracleRole.MAIN)]) {
    tokenConfigs[tokenConfig.asset] = tokenConfig;
    emit TokenConfigAdded(
      tokenConfig.asset,
      tokenConfig.oracles[uint256(OracleRole.MAIN)],
      tokenConfig.oracles[uint256(OracleRole.PIVOT)],
      tokenConfig.oracles[uint256(OracleRole.FALLBACK)],
      tokenConfig.timeDeltaTolerance
    );
  }

  /**
   * @notice Gets oracle and enabled status by asset address
     * @param asset asset address
     * @param role Oracle role
     * @return oracle Oracle address based on role
     * @return enabled Enabled flag of the oracle based on token config
     */
  function getOracle(address asset, OracleRole role)public view returns (address oracle, bool enabled) {
    oracle = tokenConfigs[asset].oracles[uint256(role)];
    enabled = tokenConfigs[asset].enableFlagsForOracles[uint256(role)];
  }

  /**
    * @notice Gets price from the oracle, which transform price's data type from int256 to uint256
      * @param oracle Oracle address
      * @return price USD price in scaled decimal places
      * @custom:error Invalid price error is thrown if the price fetched from the oracle is invalid
      */
  function getPriceFromOracle(address oracle, uint256 tolerance) external view returns (uint256) {
    try AggregatorV3Interface(oracle).latestRoundData() returns (
      uint80, int256 answer, uint256, uint256 updatedAt, uint80
    ) {
      if (tolerance != 0 && block.timestamp - updatedAt > tolerance) {
        return INVALID_PRICE;
      }
      return uint256(answer);
    } catch {
      return INVALID_PRICE;
    }
  }

  /**
    * @notice Gets price for the provided asset
      * @param asset asset address
      * @return price USD price in scaled decimal places
      * @custom:error Invalid price error is thrown if the price fetched from the oracle is invalid
      */
  function _getPrice(address asset) internal view returns (uint256) {
    uint256 pivotPrice = INVALID_PRICE; // 0

    // Get pivot oracle price, Invalid price if not available or error
    (address pivotOracle, bool pivotOracleEnabled) = getOracle(asset, OracleRole.PIVOT);
    if (pivotOracleEnabled && pivotOracle != address(0)) {
      try this.getPriceFromOracle(
        pivotOracle,
        tokenConfigs[asset].timeDeltaTolerance
      ) returns (uint256 pricePivot) {
        pivotPrice = pricePivot;
      } catch {}
    }

    // Compare main price and pivot price, return main price and if validation was successful
    // note: In case pivot oracle is not available but main price is available and
    // validation is successful, the main oracle price is returned.
    (uint256 mainPrice, bool validatedPivotMain) = _getMainOraclePrice(
      asset,
      pivotPrice,
      pivotOracleEnabled && pivotOracle != address(0)
    );
    if (mainPrice != INVALID_PRICE && validatedPivotMain) return mainPrice;

    // Compare fallback and pivot if main oracle comparision fails with pivot
    // Return fallback price when fallback price is validated successfully with pivot oracle
    (uint256 fallbackPrice, bool validatedPivotFallback) = _getFallbackOraclePrice(asset, pivotPrice);
    if (fallbackPrice != INVALID_PRICE && validatedPivotFallback) return fallbackPrice;

    // Lastly compare main price and fallback price
    if (
      mainPrice != INVALID_PRICE &&
      fallbackPrice != INVALID_PRICE &&
      boundValidator.validatePriceWithAnchorPrice(asset, mainPrice, fallbackPrice)
    ) {
      return mainPrice;
    }

    revert("invalid resilient oracle price");
  }

  /**
   * @notice Gets a price for the provided asset
     * @dev This function won't revert when price is 0, because the fallback oracle may still be
     * able to fetch a correct price
     * @param asset asset address
     * @param pivotPrice Pivot oracle price
     * @param pivotEnabled If pivot oracle is not empty and enabled
     * @return price USD price in scaled decimals
     * e.g. asset decimals is 8 then price is returned as 10**18 * 10**(18-8) = 10**28 decimals
     * @return pivotValidated Boolean representing if the validation of main oracle price
     * and pivot oracle price were successful
     * @custom:error Invalid price error is thrown if main oracle fails to fetch price of the asset
     * @custom:error Invalid price error is thrown if main oracle is not enabled or main oracle
     * address is null
     */
  function _getMainOraclePrice(
    address asset,
    uint256 pivotPrice,
    bool pivotEnabled
  ) internal view returns (uint256, bool) {
    (address mainOracle, bool mainOracleEnabled) = getOracle(asset, OracleRole.MAIN);
    if (mainOracleEnabled && mainOracle != address(0)) {
      try this.getPriceFromOracle(
        mainOracle,
        tokenConfigs[asset].timeDeltaTolerance
      ) returns (uint256 mainOraclePrice) {
        if (!pivotEnabled) {
          return (mainOraclePrice, true);
        }
        if (pivotPrice == INVALID_PRICE) {
          return (mainOraclePrice, false);
        }
        return (
          mainOraclePrice,
          boundValidator.validatePriceWithAnchorPrice(asset, mainOraclePrice, pivotPrice)
        );
      } catch {
        return (INVALID_PRICE, false);
      }
    }

    return (INVALID_PRICE, false);
  }

  /**
   * @dev This function won't revert when the price is 0 because getPrice checks if price is > 0
     * @param asset asset address
     * @return price USD price in 18 decimals
     * @return pivotValidated Boolean representing if the validation of fallback oracle price
     * and pivot oracle price were successfull
     * @custom:error Invalid price error is thrown if fallback oracle fails to fetch price of the asset
     * @custom:error Invalid price error is thrown if fallback oracle is not enabled or fallback oracle
     * address is null
     */
  function _getFallbackOraclePrice(address asset, uint256 pivotPrice) private view returns (uint256, bool) {
    (address fallbackOracle, bool fallbackEnabled) = getOracle(asset, OracleRole.FALLBACK);
    if (fallbackEnabled && fallbackOracle != address(0)) {
      try this.getPriceFromOracle(
        fallbackOracle,
        tokenConfigs[asset].timeDeltaTolerance
      ) returns (uint256 fallbackOraclePrice) {
        if (pivotPrice == INVALID_PRICE) {
          return (fallbackOraclePrice, false);
        }
        return (
          fallbackOraclePrice,
          boundValidator.validatePriceWithAnchorPrice(asset, fallbackOraclePrice, pivotPrice)
        );
      } catch {
        return (INVALID_PRICE, false);
      }
    }

    return (INVALID_PRICE, false);
  }
}
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 100
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}