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Contract Source Code:

// File: @openzeppelin/contracts/utils/Context.sol


// 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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @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 Returns the address of the current owner.
     */
    function owner() public view virtual 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 {
        _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);
    }
}

// File: CLient/boba/OVM_GasPriceOracle.sol


pragma solidity ^0.8.9;

/* External Imports */


/**
 * @title OVM_GasPriceOracle
 * @dev This contract exposes the current l2 gas price, a measure of how congested the network
 * currently is. This measure is used by the Sequencer to determine what fee to charge for
 * transactions. When the system is more congested, the l2 gas price will increase and fees
 * will also increase as a result.
 *
 * All public variables are set while generating the initial L2 state. The
 * constructor doesn't run in practice as the L2 state generation script uses
 * the deployed bytecode instead of running the initcode.
 */
contract OVM_GasPriceOracle is Ownable {
  /*************
   * Variables *
   *************/

  // Current L2 gas price
  uint256 public gasPrice;
  // Current L1 base fee
  uint256 public l1BaseFee;
  // Amortized cost of batch submission per transaction
  uint256 public overhead;
  // Value to scale the fee up by
  uint256 public scalar;
  // Number of decimals of the scalar
  uint256 public decimals;

  /***************
   * Constructor *
   ***************/

  /**
   * @param _owner Address that will initially own this contract.
   */
  constructor(address _owner) Ownable() {
    transferOwnership(_owner);
  }

  /**********
   * Events *
   **********/

  event GasPriceUpdated(uint256);
  event L1BaseFeeUpdated(uint256);
  event OverheadUpdated(uint256);
  event ScalarUpdated(uint256);
  event DecimalsUpdated(uint256);

  /********************
   * Public Functions *
   ********************/

  /**
   * Allows the owner to modify the l2 gas price.
   * @param _gasPrice New l2 gas price.
   */
  function setGasPrice(uint256 _gasPrice) public onlyOwner {
    gasPrice = _gasPrice;
    emit GasPriceUpdated(_gasPrice);
  }

  /**
   * Allows the owner to modify the l1 base fee.
   * @param _baseFee New l1 base fee
   */
  function setL1BaseFee(uint256 _baseFee) public onlyOwner {
    l1BaseFee = _baseFee;
    emit L1BaseFeeUpdated(_baseFee);
  }

  /**
   * Allows the owner to modify the overhead.
   * @param _overhead New overhead
   */
  function setOverhead(uint256 _overhead) public onlyOwner {
    overhead = _overhead;
    emit OverheadUpdated(_overhead);
  }

  /**
   * Allows the owner to modify the scalar.
   * @param _scalar New scalar
   */
  function setScalar(uint256 _scalar) public onlyOwner {
    scalar = _scalar;
    emit ScalarUpdated(_scalar);
  }

  /**
   * Allows the owner to modify the decimals.
   * @param _decimals New decimals
   */
  function setDecimals(uint256 _decimals) public onlyOwner {
    decimals = _decimals;
    emit DecimalsUpdated(_decimals);
  }

  /**
   * Computes the L1 portion of the fee
   * based on the size of the RLP encoded tx
   * and the current l1BaseFee
   * @param _data Unsigned RLP encoded tx, 6 elements
   * @return L1 fee that should be paid for the tx
   */
  function getL1Fee(bytes memory _data) public view returns (uint256) {
    uint256 l1GasUsed = getL1GasUsed(_data);
    uint256 l1Fee = l1GasUsed * l1BaseFee;
    uint256 divisor = 10**decimals;
    uint256 unscaled = l1Fee * scalar;
    uint256 scaled = unscaled / divisor;
    return scaled;
  }

  /**
   * Computes the amount of L1 gas used for a transaction
   * The overhead represents the per batch gas overhead of
   * posting both transaction and state roots to L1 given larger
   * batch sizes.
   * 4 gas for 0 byte
   * https://github.com/ethereum/go-ethereum/blob/
   *    9ada4a2e2c415e6b0b51c50e901336872e028872/params/protocol_params.go#L33
   * 16 gas for non zero byte
   * https://github.com/ethereum/go-ethereum/blob/
   *    9ada4a2e2c415e6b0b51c50e901336872e028872/params/protocol_params.go#L87
   * This will need to be updated if calldata gas prices change
   * Account for the transaction being unsigned
   * Padding is added to account for lack of signature on transaction
   * 1 byte for RLP V prefix
   * 1 byte for V
   * 1 byte for RLP R prefix
   * 32 bytes for R
   * 1 byte for RLP S prefix
   * 32 bytes for S
   * Total: 68 bytes of padding
   * @param _data Unsigned RLP encoded tx, 6 elements
   * @return Amount of L1 gas used for a transaction
   */
  function getL1GasUsed(bytes memory _data) public view returns (uint256) {
    uint256 total = 0;
    for (uint256 i = 0; i < _data.length; i++) {
      if (_data[i] == 0) {
        total += 4;
      } else {
        total += 16;
      }
    }
    uint256 unsigned = total + overhead;
    return unsigned + (68 * 16);
  }
}