CircuitBreaker.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@chainlink/contracts/src/v0.8/AutomationCompatible.sol";
import {AutomationCompatibleInterface} from "@chainlink/contracts/src/v0.8/AutomationCompatible.sol";

import {IPerformExecutor} from './interfaces/IPerformExecutor.sol';


contract CircuitBreaker is AutomationCompatibleInterface {
  /**
   * @dev run off-chain, checks if balance is greater than expected and decides whether to run emergency action on-chain
   * @param checkData address of the Executor contract
   */
  function checkUpkeep(bytes calldata checkData)
    external
    view
    override
    returns (bool, bytes memory)
  {
    address executorAddress = abi.decode(checkData, (address));
    IPerformExecutor performExecutor = IPerformExecutor(
      executorAddress
    );

    if (
      performExecutor.isFeedParamMet() &&
      performExecutor.isEmergencyActionPossible()
    ) {
      return (true, checkData);
    }

    return (false, checkData);
  }

  /**
   * @dev if feed params are not met - executes emergency action 
   * @param performData address of the PerformExecutor contract
   */
  function performUpkeep(bytes calldata performData) external override {
    address executorAddress = abi.decode(performData, (address));

    IPerformExecutor performExecutor = IPerformExecutor(
      executorAddress
    );

    performExecutor.executeEmergencyAction();
  }
}