// SPDX-License-Identifier: MIT
pragma solidity ^0.8.6;

/**
 * @title Chainlink Functions client interface.
 */
interface FunctionsClientInterface {
  /**
   * @notice Returns the DON's secp256k1 public key used to encrypt secrets
   * @dev All Oracles nodes have the corresponding private key
   * needed to decrypt the secrets encrypted with the public key
   * @return publicKey DON's public key
   */
  function getDONPublicKey() external view returns (bytes memory);

  /**
   * @notice Chainlink Functions response handler called by the designated transmitter node in an OCR round.
   * @param requestId The requestId returned by FunctionsClient.sendRequest().
   * @param response Aggregated response from the user code.
   * @param err Aggregated error either from the user code or from the execution pipeline.
   * Either response or error parameter will be set, but never both.
   */
  function handleOracleFulfillment(
    bytes32 requestId,
    bytes memory response,
    bytes memory err
  ) external;
}