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• interface AggregatorInterface
•    - function latestAnswer()
•    - function latestTimestamp()
•    - function latestRound()
•    - function getAnswer(uint256 roundId)
•    - function getTimestamp(uint256 roundId ...
• interface AggregatorV3Interface
•    - function decimals()
•    - function description()
•    - function version()
•    - function getRoundData(uint80 _roundId ...
•    - function latestRoundData()
•  contract AggregatorFacade is Aggre ... *
•    - function latestRound()
•    - function latestAnswer()
•    - function latestTimestamp()
•    - function latestRoundData()
•    - function getAnswer(uint256 _roundId)
•    - function getTimestamp(uint256 _roundI ...
•    - function getRoundData(uint80 _roundId ...
•    - function _getRoundData(uint80 _roundI ...

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/**
 *Submitted for verification at Etherscan.io on 2020-07-28
*/

pragma solidity 0.6.6;


interface AggregatorInterface {
  function latestAnswer() external view returns (int256);
  function latestTimestamp() external view returns (uint256);
  function latestRound() external view returns (uint256);
  function getAnswer(uint256 roundId) external view returns (int256);
  function getTimestamp(uint256 roundId) external view returns (uint256);

  event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 timestamp);
  event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt);
}

interface AggregatorV3Interface {

  function decimals() external view returns (uint8);
  function description() external view returns (string memory);
  function version() external view returns (uint256);

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  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
    );

  event NewRound(
    uint256 indexed roundId,
    address indexed startedBy,
    uint256 startedAt
  );
  event AnswerUpdated(
    int256 indexed current,
    uint256 indexed roundId,
    uint256 updatedAt
  );

}

/**
 * @title A facade forAggregator versions to conform to the new v0.6
 * Aggregator V3 interface.
 */
contract AggregatorFacade is AggregatorInterface, AggregatorV3Interface {

  AggregatorInterface public aggregator;
  uint8 public override decimals;
  string public override description;

  uint256 constant public override version = 2;

  // An error specific to the Aggregator V3 Interface, to prevent possible
  // confusion around accidentally reading unset values as reported values.
  string constant private V3_NO_DATA_ERROR = "No data present";

  constructor(
    address _aggregator,
    uint8 _decimals,
    string memory _description
  ) public {
    aggregator = AggregatorInterface(_aggregator);
    decimals = _decimals;
    description = _description;
  }

  /**
   * @notice get the latest completed round where the answer was updated
   */
  function latestRound()
    external
    view
    virtual
    override
    returns (uint256)
  {
    return aggregator.latestRound();
  }

  /**
   * @notice Reads the current answer from aggregator delegated to.
   */
  function latestAnswer()
    external
    view
    virtual
    override
    returns (int256)
  {
    return aggregator.latestAnswer();
  }

  /**
   * @notice Reads the last updated height from aggregator delegated to.
   */
  function latestTimestamp()
    external
    view
    virtual
    override
    returns (uint256)
  {
    return aggregator.latestTimestamp();
  }

  /**
   * @notice get data about the latest round. Consumers are encouraged to check
   * that they're receiving fresh data by inspecting the updatedAt value.
   * @return roundId is the round ID for which data was retrieved
   * @return answer is the answer for the given round
   * @return startedAt is always equal to updatedAt because the underlying
   * Aggregator contract does not expose this information.
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is always equal to roundId because the underlying
   * Aggregator contract does not expose this information.
   * @dev Note that for rounds that haven't yet received responses from all
   * oracles, answer and updatedAt may change between queries.
   */
  function latestRoundData()
    external
    view
    virtual
    override
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return _getRoundData(uint80(aggregator.latestRound()));
  }

  /**
   * @notice get past rounds answers
   * @param _roundId the answer number to retrieve the answer for
   */
  function getAnswer(uint256 _roundId)
    external
    view
    virtual
    override
    returns (int256)
  {
    return aggregator.getAnswer(_roundId);
  }

  /**
   * @notice get block timestamp when an answer was last updated
   * @param _roundId the answer number to retrieve the updated timestamp for
   */
  function getTimestamp(uint256 _roundId)
    external
    view
    virtual
    override
    returns (uint256)
  {
    return aggregator.getTimestamp(_roundId);
  }

  /**
   * @notice get data about a round. Consumers are encouraged to check
   * that they're receiving fresh data by inspecting the updatedAt value.
   * @param _roundId the round ID to retrieve the round data for
   * @return roundId is the round ID for which data was retrieved
   * @return answer is the answer for the given round
   * @return startedAt is always equal to updatedAt because the underlying
   * Aggregator contract does not expose this information.
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is always equal to roundId because the underlying
   * Aggregator contract does not expose this information.
   * @dev Note that for rounds that haven't yet received responses from all
   * oracles, answer and updatedAt may change between queries.
   */
  function getRoundData(uint80 _roundId)
    external
    view
    virtual
    override
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return _getRoundData(_roundId);
  }

  /*
   * Internal
   */

  function _getRoundData(uint80 _roundId)
    internal
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    answer = aggregator.getAnswer(_roundId);
    updatedAt = uint64(aggregator.getTimestamp(_roundId));

    require(updatedAt > 0, V3_NO_DATA_ERROR);

    return (_roundId, answer, updatedAt, updatedAt, _roundId);
  }

}

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[{"inputs":[{"internalType":"address","name":"_aggregator","type":"address"},{"internalType":"uint8","name":"_decimals","type":"uint8"},{"internalType":"string","name":"_description","type":"string"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"int256","name":"current","type":"int256"},{"indexed":true,"internalType":"uint256","name":"roundId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"updatedAt","type":"uint256"}],"name":"AnswerUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"roundId","type":"uint256"},{"indexed":true,"internalType":"address","name":"startedBy","type":"address"},{"indexed":false,"internalType":"uint256","name":"startedAt","type":"uint256"}],"name":"NewRound","type":"event"},{"inputs":[],"name":"aggregator","outputs":[{"internalType":"contract AggregatorInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"description","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_roundId","type":"uint256"}],"name":"getAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"_roundId","type":"uint80"}],"name":"getRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_roundId","type":"uint256"}],"name":"getTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRound","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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