Interfaces

Data Streams require several interfaces in order to retrieve and verify reports.

In the current code example for using Data Streams with Automation, these interfaces are specified in the example itself. Imports for these interfaces will be available in the future.

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

import {Common} from "@chainlink/contracts/src/v0.8/llo-feeds/libraries/Common.sol";
import {StreamsLookupCompatibleInterface} from "@chainlink/contracts/src/v0.8/automation/interfaces/StreamsLookupCompatibleInterface.sol";
import {ILogAutomation, Log} from "@chainlink/contracts/src/v0.8/automation/interfaces/ILogAutomation.sol";
import {IRewardManager} from "@chainlink/contracts/src/v0.8/llo-feeds/interfaces/IRewardManager.sol";
import {IVerifierFeeManager} from "@chainlink/contracts/src/v0.8/llo-feeds/interfaces/IVerifierFeeManager.sol";
import {IERC20} from "@chainlink/contracts/src/v0.8/vendor/openzeppelin-solidity/v4.8.3/contracts/interfaces/IERC20.sol";

/**
 * THIS IS AN EXAMPLE CONTRACT THAT USES UN-AUDITED CODE FOR DEMONSTRATION PURPOSES.
 * DO NOT USE THIS CODE IN PRODUCTION.
 */

// Custom interfaces for IVerifierProxy and IFeeManager
interface IVerifierProxy {
    /**
     * @notice Verifies that the data encoded has been signed.
     * correctly by routing to the correct verifier, and bills the user if applicable.
     * @param payload The encoded data to be verified, including the signed
     * report.
     * @param parameterPayload Fee metadata for billing. For the current implementation this is just the abi-encoded fee token ERC-20 address.
     * @return verifierResponse The encoded report from the verifier.
     */
    function verify(
        bytes calldata payload,
        bytes calldata parameterPayload
    ) external payable returns (bytes memory verifierResponse);

    function s_feeManager() external view returns (IVerifierFeeManager);
}

interface IFeeManager {
    /**
     * @notice Calculates the fee and reward associated with verifying a report, including discounts for subscribers.
     * This function assesses the fee and reward for report verification, applying a discount for recognized subscriber addresses.
     * @param subscriber The address attempting to verify the report. A discount is applied if this address
     * is recognized as a subscriber.
     * @param unverifiedReport The report data awaiting verification. The content of this report is used to
     * determine the base fee and reward, before considering subscriber discounts.
     * @param quoteAddress The payment token address used for quoting fees and rewards.
     * @return fee The fee assessed for verifying the report, with subscriber discounts applied where applicable.
     * @return reward The reward allocated to the caller for successfully verifying the report.
     * @return totalDiscount The total discount amount deducted from the fee for subscribers
     */
    function getFeeAndReward(
        address subscriber,
        bytes memory unverifiedReport,
        address quoteAddress
    ) external returns (Common.Asset memory, Common.Asset memory, uint256);

    function i_linkAddress() external view returns (address);

    function i_nativeAddress() external view returns (address);

    function i_rewardManager() external view returns (address);
}

contract StreamsUpkeep is ILogAutomation, StreamsLookupCompatibleInterface {
    error InvalidReportVersion(uint16 version); // Thrown when an unsupported report version is provided to verifyReport.

    /**
     * @dev Represents a data report from a Data Streams stream for v3 schema (crypto streams).
     * The `price`, `bid`, and `ask` values are carried to either 8 or 18 decimal places, depending on the stream.
     * For more information, see https://docs.chain.link/data-streams/crypto-streams and https://docs.chain.link/data-streams/reference/report-schema
     */
    struct ReportV3 {
        bytes32 feedId; // The stream ID the report has data for.
        uint32 validFromTimestamp; // Earliest timestamp for which price is applicable.
        uint32 observationsTimestamp; // Latest timestamp for which price is applicable.
        uint192 nativeFee; // Base cost to validate a transaction using the report, denominated in the chain’s native token (e.g., WETH/ETH).
        uint192 linkFee; // Base cost to validate a transaction using the report, denominated in LINK.
        uint32 expiresAt; // Latest timestamp where the report can be verified onchain.
        int192 price; // DON consensus median price (8 or 18 decimals).
        int192 bid; // Simulated price impact of a buy order up to the X% depth of liquidity utilisation (8 or 18 decimals).
        int192 ask; // Simulated price impact of a sell order up to the X% depth of liquidity utilisation (8 or 18 decimals).
    }

    /**
     * @dev Represents a data report from a Data Streams stream for v4 schema (RWA streams).
     * The `price` value is carried to either 8 or 18 decimal places, depending on the stream.
     * The `marketStatus` indicates whether the market is currently open. Possible values: `0` (`Unknown`), `1` (`Closed`), `2` (`Open`).
     * For more information, see https://docs.chain.link/data-streams/rwa-streams and https://docs.chain.link/data-streams/reference/report-schema-v4
     */
    struct ReportV4 {
        bytes32 feedId; // The stream ID the report has data for.
        uint32 validFromTimestamp; // Earliest timestamp for which price is applicable.
        uint32 observationsTimestamp; // Latest timestamp for which price is applicable.
        uint192 nativeFee; // Base cost to validate a transaction using the report, denominated in the chain’s native token (e.g., WETH/ETH).
        uint192 linkFee; // Base cost to validate a transaction using the report, denominated in LINK.
        uint32 expiresAt; // Latest timestamp where the report can be verified onchain.
        int192 price; // DON consensus median benchmark price (8 or 18 decimals).
        uint32 marketStatus; // The DON's consensus on whether the market is currently open.
    }

    struct Quote {
        address quoteAddress;
    }

    IVerifierProxy public verifier;

    address public FEE_ADDRESS;
    string public constant DATASTREAMS_FEEDLABEL = "feedIDs";
    string public constant DATASTREAMS_QUERYLABEL = "timestamp";
    int192 public lastDecodedPrice;

    // This example reads the ID for the ETH/USD report.
    // Find a complete list of IDs at https://docs.chain.link/data-streams/crypto-streams.
    string[] public feedIds = [
        "0x000359843a543ee2fe414dc14c7e7920ef10f4372990b79d6361cdc0dd1ba782"
    ];

    constructor(address _verifier) {
        verifier = IVerifierProxy(_verifier);
    }

    // This function uses revert to convey call information.
    // See https://eips.ethereum.org/EIPS/eip-3668#rationale for details.
    function checkLog(
        Log calldata log,
        bytes memory
    ) external returns (bool upkeepNeeded, bytes memory performData) {
        revert StreamsLookup(
            DATASTREAMS_FEEDLABEL,
            feedIds,
            DATASTREAMS_QUERYLABEL,
            log.timestamp,
            ""
        );
    }

    /**
     * @notice this is a new, optional function in streams lookup. It is meant to surface streams lookup errors.
     * @return upkeepNeeded boolean to indicate whether the keeper should call performUpkeep or not.
     * @return performData bytes that the keeper should call performUpkeep with, if
     * upkeep is needed. If you would like to encode data to decode later, try `abi.encode`.
     */
    function checkErrorHandler(
        uint256 /*errCode*/,
        bytes memory /*extraData*/
    ) external pure returns (bool upkeepNeeded, bytes memory performData) {
        return (true, "0");
        // Hardcoded to always perform upkeep.
        // Read the StreamsLookup error handler guide for more information.
        // https://docs.chain.link/chainlink-automation/guides/streams-lookup-error-handler
    }

    // The Data Streams report bytes is passed here.
    // extraData is context data from stream lookup process.
    // Your contract may include logic to further process this data.
    // This method is intended only to be simulated offchain by Automation.
    // The data returned will then be passed by Automation into performUpkeep
    function checkCallback(
        bytes[] calldata values,
        bytes calldata extraData
    ) external pure returns (bool, bytes memory) {
        return (true, abi.encode(values, extraData));
    }

    // function will be performed onchain
    function performUpkeep(bytes calldata performData) external {
        // Decode the performData bytes passed in by CL Automation.
        // This contains the data returned by your implementation in checkCallback().
        (bytes[] memory signedReports, bytes memory extraData) = abi.decode(
            performData,
            (bytes[], bytes)
        );

        bytes memory unverifiedReport = signedReports[0];

        (, /* bytes32[3] reportContextData */ bytes memory reportData) = abi
            .decode(unverifiedReport, (bytes32[3], bytes));

        // Extract report version from reportData
        uint16 reportVersion = (uint16(uint8(reportData[0])) << 8) |
            uint16(uint8(reportData[1]));

        // Validate report version
        if (reportVersion != 3 && reportVersion != 4) {
            revert InvalidReportVersion(uint8(reportVersion));
        }

        // Report verification fees
        IFeeManager feeManager = IFeeManager(address(verifier.s_feeManager()));
        IRewardManager rewardManager = IRewardManager(
            address(feeManager.i_rewardManager())
        );

        address feeTokenAddress = feeManager.i_linkAddress();
        (Common.Asset memory fee, , ) = feeManager.getFeeAndReward(
            address(this),
            reportData,
            feeTokenAddress
        );

        // Approve rewardManager to spend this contract's balance in fees
        IERC20(feeTokenAddress).approve(address(rewardManager), fee.amount);

        // Verify the report
        bytes memory verifiedReportData = verifier.verify(
            unverifiedReport,
            abi.encode(feeTokenAddress)
        );

        // Decode verified report data into the appropriate Report struct based on reportVersion
        if (reportVersion == 3) {
            // v3 report schema
            ReportV3 memory verifiedReport = abi.decode(
                verifiedReportData,
                (ReportV3)
            );

            // Store the price from the report
            lastDecodedPrice = verifiedReport.price;
        } else if (reportVersion == 4) {
            // v4 report schema
            ReportV4 memory verifiedReport = abi.decode(
                verifiedReportData,
                (ReportV4)
            );

            // Store the price from the report
            lastDecodedPrice = verifiedReport.price;
        }
    }
}
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