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0x38336BDaE79747a1d2c4e6C67BBF382244287ca6

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Transaction Hash
Method
Block
From
To
Value
Raw Fulfill Rand...229484222023-12-07 13:11:53140 days ago1701954713IN
0x38336BDa...244287ca6
0 FTM0.000301342.5
Set Config106125452022-09-15 20:30:26587 days ago1663273826IN
0x38336BDa...244287ca6
0 FTM0.000056281.025008
Set Config105767372022-09-14 20:00:55588 days ago1663185655IN
0x38336BDa...244287ca6
0 FTM0.000305252.05003
0x61012060105767352022-09-14 20:00:54588 days ago1663185654IN
 Create: VRFV2Wrapper
0 FTM0.0039922.05003

Latest 1 internal transaction

Parent Transaction Hash Block From To Value
105767352022-09-14 20:00:54588 days ago1663185654  Contract Creation0 FTM
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Contract Source Code Verified (Exact Match)

Contract Name:
VRFV2Wrapper

Compiler Version
v0.8.6+commit.11564f7e

Optimization Enabled:
Yes with 1000000 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 12 : VRFV2Wrapper.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.6;

import "./ConfirmedOwner.sol";
import "./interfaces/TypeAndVersionInterface.sol";
import "./VRFConsumerBaseV2.sol";
import "./interfaces/LinkTokenInterface.sol";
import "./interfaces/AggregatorV3Interface.sol";
import "./interfaces/VRFCoordinatorV2Interface.sol";
import "./interfaces/VRFV2WrapperInterface.sol";
import "./VRFV2WrapperConsumerBase.sol";

/**
 * @notice A wrapper for VRFCoordinatorV2 that provides an interface better suited to one-off
 * @notice requests for randomness.
 */
contract VRFV2Wrapper is ConfirmedOwner, TypeAndVersionInterface, VRFConsumerBaseV2, VRFV2WrapperInterface {
  event WrapperFulfillmentFailed(uint256 indexed requestId, address indexed consumer);

  LinkTokenInterface public immutable LINK;
  AggregatorV3Interface public immutable LINK_ETH_FEED;
  ExtendedVRFCoordinatorV2Interface public immutable COORDINATOR;
  uint64 public immutable SUBSCRIPTION_ID;

  // 5k is plenty for an EXTCODESIZE call (2600) + warm CALL (100)
  // and some arithmetic operations.
  uint256 private constant GAS_FOR_CALL_EXACT_CHECK = 5_000;

  // lastRequestId is the request ID of the most recent VRF V2 request made by this wrapper. This
  // should only be relied on within the same transaction the request was made.
  uint256 public override lastRequestId;

  // Configuration fetched from VRFCoordinatorV2

  // s_configured tracks whether this contract has been configured. If not configured, randomness
  // requests cannot be made.
  bool public s_configured;

  // s_disabled disables the contract when true. When disabled, new VRF requests cannot be made
  // but existing ones can still be fulfilled.
  bool public s_disabled;

  // s_fallbackWeiPerUnitLink is the backup LINK exchange rate used when the LINK/NATIVE feed is
  // stale.
  int256 private s_fallbackWeiPerUnitLink;

  // s_stalenessSeconds is the number of seconds before we consider the feed price to be stale and
  // fallback to fallbackWeiPerUnitLink.
  uint32 private s_stalenessSeconds;

  // s_fulfillmentFlatFeeLinkPPM is the flat fee in millionths of LINK that VRFCoordinatorV2
  // charges.
  uint32 private s_fulfillmentFlatFeeLinkPPM;

  // Other configuration

  // s_wrapperGasOverhead reflects the gas overhead of the wrapper's fulfillRandomWords
  // function. The cost for this gas is passed to the user.
  uint32 private s_wrapperGasOverhead;

  // s_coordinatorGasOverhead reflects the gas overhead of the coordinator's fulfillRandomWords
  // function. The cost for this gas is billed to the subscription, and must therefor be included
  // in the pricing for wrapped requests. This includes the gas costs of proof verification and
  // payment calculation in the coordinator.
  uint32 private s_coordinatorGasOverhead;

  // s_wrapperPremiumPercentage is the premium ratio in percentage. For example, a value of 0
  // indicates no premium. A value of 15 indicates a 15 percent premium.
  uint8 private s_wrapperPremiumPercentage;

  // s_keyHash is the key hash to use when requesting randomness. Fees are paid based on current gas
  // fees, so this should be set to the highest gas lane on the network.
  bytes32 s_keyHash;

  // s_maxNumWords is the max number of words that can be requested in a single wrapped VRF request.
  uint8 s_maxNumWords;

  struct Callback {
    address callbackAddress;
    uint32 callbackGasLimit;
    uint256 requestGasPrice;
    int256 requestWeiPerUnitLink;
    uint256 juelsPaid;
  }
  mapping(uint256 => Callback) /* requestID */ /* callback */
    public s_callbacks;

  constructor(
    address _link,
    address _linkEthFeed,
    address _coordinator
  ) ConfirmedOwner(msg.sender) VRFConsumerBaseV2(_coordinator) {
    LINK = LinkTokenInterface(_link);
    LINK_ETH_FEED = AggregatorV3Interface(_linkEthFeed);
    COORDINATOR = ExtendedVRFCoordinatorV2Interface(_coordinator);

    // Create this wrapper's subscription and add itself as a consumer.
    uint64 subId = ExtendedVRFCoordinatorV2Interface(_coordinator).createSubscription();
    SUBSCRIPTION_ID = subId;
    ExtendedVRFCoordinatorV2Interface(_coordinator).addConsumer(subId, address(this));
  }

  /**
   * @notice setConfig configures VRFV2Wrapper.
   *
   * @dev Sets wrapper-specific configuration based on the given parameters, and fetches any needed
   * @dev VRFCoordinatorV2 configuration from the coordinator.
   *
   * @param _wrapperGasOverhead reflects the gas overhead of the wrapper's fulfillRandomWords
   *        function.
   *
   * @param _coordinatorGasOverhead reflects the gas overhead of the coordinator's
   *        fulfillRandomWords function.
   *
   * @param _wrapperPremiumPercentage is the premium ratio in percentage for wrapper requests.
   *
   * @param _keyHash to use for requesting randomness.
   */
  function setConfig(
    uint32 _wrapperGasOverhead,
    uint32 _coordinatorGasOverhead,
    uint8 _wrapperPremiumPercentage,
    bytes32 _keyHash,
    uint8 _maxNumWords
  ) external onlyOwner {
    s_wrapperGasOverhead = _wrapperGasOverhead;
    s_coordinatorGasOverhead = _coordinatorGasOverhead;
    s_wrapperPremiumPercentage = _wrapperPremiumPercentage;
    s_keyHash = _keyHash;
    s_maxNumWords = _maxNumWords;
    s_configured = true;

    // Get other configuration from coordinator
    (, , s_stalenessSeconds, ) = COORDINATOR.getConfig();
    s_fallbackWeiPerUnitLink = COORDINATOR.getFallbackWeiPerUnitLink();
    (s_fulfillmentFlatFeeLinkPPM, , , , , , , , ) = COORDINATOR.getFeeConfig();
  }

  /**
   * @notice getConfig returns the current VRFV2Wrapper configuration.
   *
   * @return fallbackWeiPerUnitLink is the backup LINK exchange rate used when the LINK/NATIVE feed
   *         is stale.
   *
   * @return stalenessSeconds is the number of seconds before we consider the feed price to be stale
   *         and fallback to fallbackWeiPerUnitLink.
   *
   * @return fulfillmentFlatFeeLinkPPM is the flat fee in millionths of LINK that VRFCoordinatorV2
   *         charges.
   *
   * @return wrapperGasOverhead reflects the gas overhead of the wrapper's fulfillRandomWords
   *         function. The cost for this gas is passed to the user.
   *
   * @return coordinatorGasOverhead reflects the gas overhead of the coordinator's
   *         fulfillRandomWords function.
   *
   * @return wrapperPremiumPercentage is the premium ratio in percentage. For example, a value of 0
   *         indicates no premium. A value of 15 indicates a 15 percent premium.
   *
   * @return keyHash is the key hash to use when requesting randomness. Fees are paid based on
   *         current gas fees, so this should be set to the highest gas lane on the network.
   *
   * @return maxNumWords is the max number of words that can be requested in a single wrapped VRF
   *         request.
   */
  function getConfig()
    external
    view
    returns (
      int256 fallbackWeiPerUnitLink,
      uint32 stalenessSeconds,
      uint32 fulfillmentFlatFeeLinkPPM,
      uint32 wrapperGasOverhead,
      uint32 coordinatorGasOverhead,
      uint8 wrapperPremiumPercentage,
      bytes32 keyHash,
      uint8 maxNumWords
    )
  {
    return (
      s_fallbackWeiPerUnitLink,
      s_stalenessSeconds,
      s_fulfillmentFlatFeeLinkPPM,
      s_wrapperGasOverhead,
      s_coordinatorGasOverhead,
      s_wrapperPremiumPercentage,
      s_keyHash,
      s_maxNumWords
    );
  }

  /**
   * @notice Calculates the price of a VRF request with the given callbackGasLimit at the current
   * @notice block.
   *
   * @dev This function relies on the transaction gas price which is not automatically set during
   * @dev simulation. To estimate the price at a specific gas price, use the estimatePrice function.
   *
   * @param _callbackGasLimit is the gas limit used to estimate the price.
   */
  function calculateRequestPrice(uint32 _callbackGasLimit)
    external
    view
    override
    onlyConfiguredNotDisabled
    returns (uint256)
  {
    int256 weiPerUnitLink = getFeedData();
    return calculateRequestPriceInternal(_callbackGasLimit, tx.gasprice, weiPerUnitLink);
  }

  /**
   * @notice Estimates the price of a VRF request with a specific gas limit and gas price.
   *
   * @dev This is a convenience function that can be called in simulation to better understand
   * @dev pricing.
   *
   * @param _callbackGasLimit is the gas limit used to estimate the price.
   * @param _requestGasPriceWei is the gas price in wei used for the estimation.
   */
  function estimateRequestPrice(uint32 _callbackGasLimit, uint256 _requestGasPriceWei)
    external
    view
    override
    onlyConfiguredNotDisabled
    returns (uint256)
  {
    int256 weiPerUnitLink = getFeedData();
    return calculateRequestPriceInternal(_callbackGasLimit, _requestGasPriceWei, weiPerUnitLink);
  }

  function calculateRequestPriceInternal(
    uint256 _gas,
    uint256 _requestGasPrice,
    int256 _weiPerUnitLink
  ) internal view returns (uint256) {
    uint256 baseFee = (1e18 * _requestGasPrice * (_gas + s_wrapperGasOverhead + s_coordinatorGasOverhead)) /
      uint256(_weiPerUnitLink);

    uint256 feeWithPremium = (baseFee * (s_wrapperPremiumPercentage + 100)) / 100;

    uint256 feeWithFlatFee = feeWithPremium + (1e12 * uint256(s_fulfillmentFlatFeeLinkPPM));

    return feeWithFlatFee;
  }

  /**
   * @notice onTokenTransfer is called by LinkToken upon payment for a VRF request.
   *
   * @dev Reverts if payment is too low.
   *
   * @param _sender is the sender of the payment, and the address that will receive a VRF callback
   *        upon fulfillment.
   *
   * @param _amount is the amount of LINK paid in Juels.
   *
   * @param _data is the abi-encoded VRF request parameters: uint32 callbackGasLimit,
   *        uint16 requestConfirmations, and uint32 numWords.
   */
  function onTokenTransfer(
    address _sender,
    uint256 _amount,
    bytes calldata _data
  ) external onlyConfiguredNotDisabled {
    require(msg.sender == address(LINK), "only callable from LINK");

    (uint32 callbackGasLimit, uint16 requestConfirmations, uint32 numWords) = abi.decode(
      _data,
      (uint32, uint16, uint32)
    );
    uint32 eip150Overhead = getEIP150Overhead(callbackGasLimit);
    int256 weiPerUnitLink = getFeedData();
    uint256 price = calculateRequestPriceInternal(callbackGasLimit, tx.gasprice, weiPerUnitLink);
    require(_amount >= price, "fee too low");
    require(numWords <= s_maxNumWords, "numWords too high");

    uint256 requestId = COORDINATOR.requestRandomWords(
      s_keyHash,
      SUBSCRIPTION_ID,
      requestConfirmations,
      callbackGasLimit + eip150Overhead + s_wrapperGasOverhead,
      numWords
    );
    s_callbacks[requestId] = Callback({
      callbackAddress: _sender,
      callbackGasLimit: callbackGasLimit,
      requestGasPrice: tx.gasprice,
      requestWeiPerUnitLink: weiPerUnitLink,
      juelsPaid: _amount
    });
    lastRequestId = requestId;
  }

  /**
   * @notice withdraw is used by the VRFV2Wrapper's owner to withdraw LINK revenue.
   *
   * @param _recipient is the address that should receive the LINK funds.
   *
   * @param _amount is the amount of LINK in Juels that should be withdrawn.
   */
  function withdraw(address _recipient, uint256 _amount) external onlyOwner {
    LINK.transfer(_recipient, _amount);
  }

  /**
   * @notice enable this contract so that new requests can be accepted.
   */
  function enable() external onlyOwner {
    s_disabled = false;
  }

  /**
   * @notice disable this contract so that new requests will be rejected. When disabled, new requests
   * @notice will revert but existing requests can still be fulfilled.
   */
  function disable() external onlyOwner {
    s_disabled = true;
  }

  function fulfillRandomWords(uint256 _requestId, uint256[] memory _randomWords) internal override {
    Callback memory callback = s_callbacks[_requestId];
    delete s_callbacks[_requestId];
    require(callback.callbackAddress != address(0), "request not found"); // This should never happen

    VRFV2WrapperConsumerBase c;
    bytes memory resp = abi.encodeWithSelector(c.rawFulfillRandomWords.selector, _requestId, _randomWords);

    bool success = callWithExactGas(callback.callbackGasLimit, callback.callbackAddress, resp);
    if (!success) {
      emit WrapperFulfillmentFailed(_requestId, callback.callbackAddress);
    }
  }

  function getFeedData() private view returns (int256) {
    bool staleFallback = s_stalenessSeconds > 0;
    uint256 timestamp;
    int256 weiPerUnitLink;
    (, weiPerUnitLink, , timestamp, ) = LINK_ETH_FEED.latestRoundData();
    // solhint-disable-next-line not-rely-on-time
    if (staleFallback && s_stalenessSeconds < block.timestamp - timestamp) {
      weiPerUnitLink = s_fallbackWeiPerUnitLink;
    }
    require(weiPerUnitLink >= 0, "Invalid LINK wei price");
    return weiPerUnitLink;
  }

  /**
   * @dev Calculates extra amount of gas required for running an assembly call() post-EIP150.
   */
  function getEIP150Overhead(uint32 gas) private pure returns (uint32) {
    return gas / 63 + 1;
  }

  /**
   * @dev calls target address with exactly gasAmount gas and data as calldata
   * or reverts if at least gasAmount gas is not available.
   */
  function callWithExactGas(
    uint256 gasAmount,
    address target,
    bytes memory data
  ) private returns (bool success) {
    // solhint-disable-next-line no-inline-assembly
    assembly {
      let g := gas()
      // Compute g -= GAS_FOR_CALL_EXACT_CHECK and check for underflow
      // The gas actually passed to the callee is min(gasAmount, 63//64*gas available).
      // We want to ensure that we revert if gasAmount >  63//64*gas available
      // as we do not want to provide them with less, however that check itself costs
      // gas.  GAS_FOR_CALL_EXACT_CHECK ensures we have at least enough gas to be able
      // to revert if gasAmount >  63//64*gas available.
      if lt(g, GAS_FOR_CALL_EXACT_CHECK) {
        revert(0, 0)
      }
      g := sub(g, GAS_FOR_CALL_EXACT_CHECK)
      // if g - g//64 <= gasAmount, revert
      // (we subtract g//64 because of EIP-150)
      if iszero(gt(sub(g, div(g, 64)), gasAmount)) {
        revert(0, 0)
      }
      // solidity calls check that a contract actually exists at the destination, so we do the same
      if iszero(extcodesize(target)) {
        revert(0, 0)
      }
      // call and return whether we succeeded. ignore return data
      // call(gas,addr,value,argsOffset,argsLength,retOffset,retLength)
      success := call(gasAmount, target, 0, add(data, 0x20), mload(data), 0, 0)
    }
    return success;
  }

  function typeAndVersion() external pure virtual override returns (string memory) {
    return "VRFV2Wrapper 1.0.0";
  }

  modifier onlyConfiguredNotDisabled() {
    require(s_configured, "wrapper is not configured");
    require(!s_disabled, "wrapper is disabled");
    _;
  }
}

interface ExtendedVRFCoordinatorV2Interface is VRFCoordinatorV2Interface {
  function getConfig()
    external
    view
    returns (
      uint16 minimumRequestConfirmations,
      uint32 maxGasLimit,
      uint32 stalenessSeconds,
      uint32 gasAfterPaymentCalculation
    );

  function getFallbackWeiPerUnitLink() external view returns (int256);

  function getFeeConfig()
    external
    view
    returns (
      uint32 fulfillmentFlatFeeLinkPPMTier1,
      uint32 fulfillmentFlatFeeLinkPPMTier2,
      uint32 fulfillmentFlatFeeLinkPPMTier3,
      uint32 fulfillmentFlatFeeLinkPPMTier4,
      uint32 fulfillmentFlatFeeLinkPPMTier5,
      uint24 reqsForTier2,
      uint24 reqsForTier3,
      uint24 reqsForTier4,
      uint24 reqsForTier5
    );
}

File 1 of 12 : ConfirmedOwner.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./ConfirmedOwnerWithProposal.sol";

/**
 * @title The ConfirmedOwner contract
 * @notice A contract with helpers for basic contract ownership.
 */
contract ConfirmedOwner is ConfirmedOwnerWithProposal {
  constructor(address newOwner) ConfirmedOwnerWithProposal(newOwner, address(0)) {}
}

File 1 of 12 : ConfirmedOwnerWithProposal.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./interfaces/OwnableInterface.sol";

/**
 * @title The ConfirmedOwner contract
 * @notice A contract with helpers for basic contract ownership.
 */
contract ConfirmedOwnerWithProposal is OwnableInterface {
  address private s_owner;
  address private s_pendingOwner;

  event OwnershipTransferRequested(address indexed from, address indexed to);
  event OwnershipTransferred(address indexed from, address indexed to);

  constructor(address newOwner, address pendingOwner) {
    require(newOwner != address(0), "Cannot set owner to zero");

    s_owner = newOwner;
    if (pendingOwner != address(0)) {
      _transferOwnership(pendingOwner);
    }
  }

  /**
   * @notice Allows an owner to begin transferring ownership to a new address,
   * pending.
   */
  function transferOwnership(address to) public override onlyOwner {
    _transferOwnership(to);
  }

  /**
   * @notice Allows an ownership transfer to be completed by the recipient.
   */
  function acceptOwnership() external override {
    require(msg.sender == s_pendingOwner, "Must be proposed owner");

    address oldOwner = s_owner;
    s_owner = msg.sender;
    s_pendingOwner = address(0);

    emit OwnershipTransferred(oldOwner, msg.sender);
  }

  /**
   * @notice Get the current owner
   */
  function owner() public view override returns (address) {
    return s_owner;
  }

  /**
   * @notice validate, transfer ownership, and emit relevant events
   */
  function _transferOwnership(address to) private {
    require(to != msg.sender, "Cannot transfer to self");

    s_pendingOwner = to;

    emit OwnershipTransferRequested(s_owner, to);
  }

  /**
   * @notice validate access
   */
  function _validateOwnership() internal view {
    require(msg.sender == s_owner, "Only callable by owner");
  }

  /**
   * @notice Reverts if called by anyone other than the contract owner.
   */
  modifier onlyOwner() {
    _validateOwnership();
    _;
  }
}

File 1 of 12 : OwnableInterface.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface OwnableInterface {
  function owner() external returns (address);

  function transferOwnership(address recipient) external;

  function acceptOwnership() external;
}

File 2 of 12 : TypeAndVersionInterface.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

abstract contract TypeAndVersionInterface {
  function typeAndVersion() external pure virtual returns (string memory);
}

File 2 of 12 : VRFConsumerBaseV2.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness. It ensures 2 things:
 * @dev 1. The fulfillment came from the VRFCoordinator
 * @dev 2. The consumer contract implements fulfillRandomWords.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constructor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash). Create subscription, fund it
 * @dev and your consumer contract as a consumer of it (see VRFCoordinatorInterface
 * @dev subscription management functions).
 * @dev Call requestRandomWords(keyHash, subId, minimumRequestConfirmations,
 * @dev callbackGasLimit, numWords),
 * @dev see (VRFCoordinatorInterface for a description of the arguments).
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomWords method.
 *
 * @dev The randomness argument to fulfillRandomWords is a set of random words
 * @dev generated from your requestId and the blockHash of the request.
 *
 * @dev If your contract could have concurrent requests open, you can use the
 * @dev requestId returned from requestRandomWords to track which response is associated
 * @dev with which randomness request.
 * @dev See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ.
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request. It is for this reason that
 * @dev that you can signal to an oracle you'd like them to wait longer before
 * @dev responding to the request (however this is not enforced in the contract
 * @dev and so remains effective only in the case of unmodified oracle software).
 */
abstract contract VRFConsumerBaseV2 {
  error OnlyCoordinatorCanFulfill(address have, address want);
  address private immutable vrfCoordinator;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   */
  constructor(address _vrfCoordinator) {
    vrfCoordinator = _vrfCoordinator;
  }

  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBaseV2 expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomWords the VRF output expanded to the requested number of words
   */
  function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords) internal virtual;

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomWords(uint256 requestId, uint256[] memory randomWords) external {
    if (msg.sender != vrfCoordinator) {
      revert OnlyCoordinatorCanFulfill(msg.sender, vrfCoordinator);
    }
    fulfillRandomWords(requestId, randomWords);
  }
}

File 2 of 12 : LinkTokenInterface.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface LinkTokenInterface {
  function allowance(address owner, address spender) external view returns (uint256 remaining);

  function approve(address spender, uint256 value) external returns (bool success);

  function balanceOf(address owner) external view returns (uint256 balance);

  function decimals() external view returns (uint8 decimalPlaces);

  function decreaseApproval(address spender, uint256 addedValue) external returns (bool success);

  function increaseApproval(address spender, uint256 subtractedValue) external;

  function name() external view returns (string memory tokenName);

  function symbol() external view returns (string memory tokenSymbol);

  function totalSupply() external view returns (uint256 totalTokensIssued);

  function transfer(address to, uint256 value) external returns (bool success);

  function transferAndCall(
    address to,
    uint256 value,
    bytes calldata data
  ) external returns (bool success);

  function transferFrom(
    address from,
    address to,
    uint256 value
  ) external returns (bool success);
}

File 2 of 12 : AggregatorV3Interface.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

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

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

  function version() external view returns (uint256);

  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
    );
}

File 2 of 12 : VRFCoordinatorV2Interface.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface VRFCoordinatorV2Interface {
  /**
   * @notice Get configuration relevant for making requests
   * @return minimumRequestConfirmations global min for request confirmations
   * @return maxGasLimit global max for request gas limit
   * @return s_provingKeyHashes list of registered key hashes
   */
  function getRequestConfig()
    external
    view
    returns (
      uint16,
      uint32,
      bytes32[] memory
    );

  /**
   * @notice Request a set of random words.
   * @param keyHash - Corresponds to a particular oracle job which uses
   * that key for generating the VRF proof. Different keyHash's have different gas price
   * ceilings, so you can select a specific one to bound your maximum per request cost.
   * @param subId  - The ID of the VRF subscription. Must be funded
   * with the minimum subscription balance required for the selected keyHash.
   * @param minimumRequestConfirmations - How many blocks you'd like the
   * oracle to wait before responding to the request. See SECURITY CONSIDERATIONS
   * for why you may want to request more. The acceptable range is
   * [minimumRequestBlockConfirmations, 200].
   * @param callbackGasLimit - How much gas you'd like to receive in your
   * fulfillRandomWords callback. Note that gasleft() inside fulfillRandomWords
   * may be slightly less than this amount because of gas used calling the function
   * (argument decoding etc.), so you may need to request slightly more than you expect
   * to have inside fulfillRandomWords. The acceptable range is
   * [0, maxGasLimit]
   * @param numWords - The number of uint256 random values you'd like to receive
   * in your fulfillRandomWords callback. Note these numbers are expanded in a
   * secure way by the VRFCoordinator from a single random value supplied by the oracle.
   * @return requestId - A unique identifier of the request. Can be used to match
   * a request to a response in fulfillRandomWords.
   */
  function requestRandomWords(
    bytes32 keyHash,
    uint64 subId,
    uint16 minimumRequestConfirmations,
    uint32 callbackGasLimit,
    uint32 numWords
  ) external returns (uint256 requestId);

  /**
   * @notice Create a VRF subscription.
   * @return subId - A unique subscription id.
   * @dev You can manage the consumer set dynamically with addConsumer/removeConsumer.
   * @dev Note to fund the subscription, use transferAndCall. For example
   * @dev  LINKTOKEN.transferAndCall(
   * @dev    address(COORDINATOR),
   * @dev    amount,
   * @dev    abi.encode(subId));
   */
  function createSubscription() external returns (uint64 subId);

  /**
   * @notice Get a VRF subscription.
   * @param subId - ID of the subscription
   * @return balance - LINK balance of the subscription in juels.
   * @return reqCount - number of requests for this subscription, determines fee tier.
   * @return owner - owner of the subscription.
   * @return consumers - list of consumer address which are able to use this subscription.
   */
  function getSubscription(uint64 subId)
    external
    view
    returns (
      uint96 balance,
      uint64 reqCount,
      address owner,
      address[] memory consumers
    );

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @param newOwner - proposed new owner of the subscription
   */
  function requestSubscriptionOwnerTransfer(uint64 subId, address newOwner) external;

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @dev will revert if original owner of subId has
   * not requested that msg.sender become the new owner.
   */
  function acceptSubscriptionOwnerTransfer(uint64 subId) external;

  /**
   * @notice Add a consumer to a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - New consumer which can use the subscription
   */
  function addConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Remove a consumer from a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - Consumer to remove from the subscription
   */
  function removeConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Cancel a subscription
   * @param subId - ID of the subscription
   * @param to - Where to send the remaining LINK to
   */
  function cancelSubscription(uint64 subId, address to) external;

  /*
   * @notice Check to see if there exists a request commitment consumers
   * for all consumers and keyhashes for a given sub.
   * @param subId - ID of the subscription
   * @return true if there exists at least one unfulfilled request for the subscription, false
   * otherwise.
   */
  function pendingRequestExists(uint64 subId) external view returns (bool);
}

File 2 of 12 : VRFV2WrapperInterface.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface VRFV2WrapperInterface {
  /**
   * @return the request ID of the most recent VRF V2 request made by this wrapper. This should only
   * be relied option within the same transaction that the request was made.
   */
  function lastRequestId() external view returns (uint256);

  /**
   * @notice Calculates the price of a VRF request with the given callbackGasLimit at the current
   * @notice block.
   *
   * @dev This function relies on the transaction gas price which is not automatically set during
   * @dev simulation. To estimate the price at a specific gas price, use the estimatePrice function.
   *
   * @param _callbackGasLimit is the gas limit used to estimate the price.
   */
  function calculateRequestPrice(uint32 _callbackGasLimit) external view returns (uint256);

  /**
   * @notice Estimates the price of a VRF request with a specific gas limit and gas price.
   *
   * @dev This is a convenience function that can be called in simulation to better understand
   * @dev pricing.
   *
   * @param _callbackGasLimit is the gas limit used to estimate the price.
   * @param _requestGasPriceWei is the gas price in wei used for the estimation.
   */
  function estimateRequestPrice(uint32 _callbackGasLimit, uint256 _requestGasPriceWei) external view returns (uint256);
}

File 2 of 12 : VRFV2WrapperConsumerBase.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./interfaces/LinkTokenInterface.sol";
import "./interfaces/VRFV2WrapperInterface.sol";

/** *******************************************************************************
 * @notice Interface for contracts using VRF randomness through the VRF V2 wrapper
 * ********************************************************************************
 * @dev PURPOSE
 *
 * @dev Create VRF V2 requests without the need for subscription management. Rather than creating
 * @dev and funding a VRF V2 subscription, a user can use this wrapper to create one off requests,
 * @dev paying up front rather than at fulfillment.
 *
 * @dev Since the price is determined using the gas price of the request transaction rather than
 * @dev the fulfillment transaction, the wrapper charges an additional premium on callback gas
 * @dev usage, in addition to some extra overhead costs associated with the VRFV2Wrapper contract.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFV2WrapperConsumerBase. The consumer must be funded
 * @dev with enough LINK to make the request, otherwise requests will revert. To request randomness,
 * @dev call the 'requestRandomness' function with the desired VRF parameters. This function handles
 * @dev paying for the request based on the current pricing.
 *
 * @dev Consumers must implement the fullfillRandomWords function, which will be called during
 * @dev fulfillment with the randomness result.
 */
abstract contract VRFV2WrapperConsumerBase {
  LinkTokenInterface internal immutable LINK;
  VRFV2WrapperInterface internal immutable VRF_V2_WRAPPER;

  /**
   * @param _link is the address of LinkToken
   * @param _vrfV2Wrapper is the address of the VRFV2Wrapper contract
   */
  constructor(address _link, address _vrfV2Wrapper) {
    LINK = LinkTokenInterface(_link);
    VRF_V2_WRAPPER = VRFV2WrapperInterface(_vrfV2Wrapper);
  }

  /**
   * @dev Requests randomness from the VRF V2 wrapper.
   *
   * @param _callbackGasLimit is the gas limit that should be used when calling the consumer's
   *        fulfillRandomWords function.
   * @param _requestConfirmations is the number of confirmations to wait before fulfilling the
   *        request. A higher number of confirmations increases security by reducing the likelihood
   *        that a chain re-org changes a published randomness outcome.
   * @param _numWords is the number of random words to request.
   *
   * @return requestId is the VRF V2 request ID of the newly created randomness request.
   */
  function requestRandomness(
    uint32 _callbackGasLimit,
    uint16 _requestConfirmations,
    uint32 _numWords
  ) internal returns (uint256 requestId) {
    LINK.transferAndCall(
      address(VRF_V2_WRAPPER),
      VRF_V2_WRAPPER.calculateRequestPrice(_callbackGasLimit),
      abi.encode(_callbackGasLimit, _requestConfirmations, _numWords)
    );
    return VRF_V2_WRAPPER.lastRequestId();
  }

  /**
   * @notice fulfillRandomWords handles the VRF V2 wrapper response. The consuming contract must
   * @notice implement it.
   *
   * @param _requestId is the VRF V2 request ID.
   * @param _randomWords is the randomness result.
   */
  function fulfillRandomWords(uint256 _requestId, uint256[] memory _randomWords) internal virtual;

  function rawFulfillRandomWords(uint256 _requestId, uint256[] memory _randomWords) external {
    require(msg.sender == address(VRF_V2_WRAPPER), "only VRF V2 wrapper can fulfill");
    fulfillRandomWords(_requestId, _randomWords);
  }
}

File 2 of 12 : VRFV2WrapperConsumerExample.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.6;

import "../VRFV2WrapperConsumerBase.sol";
import "../ConfirmedOwner.sol";

contract VRFV2WrapperConsumerExample is VRFV2WrapperConsumerBase, ConfirmedOwner {
  event WrappedRequestFulfilled(uint256 requestId, uint256[] randomWords, uint256 payment);
  event WrapperRequestMade(uint256 indexed requestId, uint256 paid);

  struct RequestStatus {
    uint256 paid;
    bool fulfilled;
    uint256[] randomWords;
  }
  mapping(uint256 => RequestStatus) /* requestId */ /* requestStatus */
    public s_requests;

  constructor(address _link, address _vrfV2Wrapper)
    ConfirmedOwner(msg.sender)
    VRFV2WrapperConsumerBase(_link, _vrfV2Wrapper)
  {}

  function makeRequest(
    uint32 _callbackGasLimit,
    uint16 _requestConfirmations,
    uint32 _numWords
  ) external onlyOwner returns (uint256 requestId) {
    requestId = requestRandomness(_callbackGasLimit, _requestConfirmations, _numWords);
    uint256 paid = VRF_V2_WRAPPER.calculateRequestPrice(_callbackGasLimit);
    s_requests[requestId] = RequestStatus({paid: paid, randomWords: new uint256[](0), fulfilled: false});
    emit WrapperRequestMade(requestId, paid);
    return requestId;
  }

  function fulfillRandomWords(uint256 _requestId, uint256[] memory _randomWords) internal override {
    require(s_requests[_requestId].paid > 0, "request not found");
    s_requests[_requestId].fulfilled = true;
    s_requests[_requestId].randomWords = _randomWords;
    emit WrappedRequestFulfilled(_requestId, _randomWords, s_requests[_requestId].paid);
  }

  function getRequestStatus(uint256 _requestId)
    external
    view
    returns (
      uint256 paid,
      bool fulfilled,
      uint256[] memory randomWords
    )
  {
    require(s_requests[_requestId].paid > 0, "request not found");
    RequestStatus memory request = s_requests[_requestId];
    return (request.paid, request.fulfilled, request.randomWords);
  }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "metadata": {
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract ABI

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ExtendedVRFCoordinatorV2Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"LINK","outputs":[{"internalType":"contract LinkTokenInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"LINK_ETH_FEED","outputs":[{"internalType":"contract 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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000fafedb041c0dd4fa2dc0d87a6b0979ee6fa7af5f000000000000000000000000f549af21578cfe2385ffd3488b3039fd9e52f006000000000000000000000000bd13f08b8352a3635218ab9418e340c60d6eb418

-----Decoded View---------------
Arg [0] : _link (address): 0xfaFedb041c0DD4fA2Dc0d87a6B0979Ee6FA7af5F
Arg [1] : _linkEthFeed (address): 0xF549af21578Cfe2385FFD3488B3039fd9e52f006
Arg [2] : _coordinator (address): 0xbd13f08b8352A3635218ab9418E340c60d6Eb418

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000fafedb041c0dd4fa2dc0d87a6b0979ee6fa7af5f
Arg [1] : 000000000000000000000000f549af21578cfe2385ffd3488b3039fd9e52f006
Arg [2] : 000000000000000000000000bd13f08b8352a3635218ab9418e340c60d6eb418


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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.