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Counter.sol
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Counter.sol
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// SPDX-License-Identifier: MIT
pragma solidity 0.8.6;
interface KeeperCompatibleInterface {
function checkUpkeep(bytes calldata checkData) external returns (bool upkeepNeeded, bytes memory performData);
function performUpkeep(bytes calldata performData) external;
}
contract Counter is KeeperCompatibleInterface {
uint public counter; // Public counter variable
// Use an interval in seconds and a timestamp to slow execution of Upkeep
uint public immutable interval;
uint public lastTimeStamp;
constructor(uint updateInterval) {
interval = updateInterval;
lastTimeStamp = block.timestamp;
counter = 0;
}
function checkUpkeep(bytes calldata checkData) external view override returns (bool upkeepNeeded, bytes memory performData) {
upkeepNeeded = (block.timestamp - lastTimeStamp) > interval;
performData = checkData;
}
function performUpkeep(bytes calldata performData) external override {
lastTimeStamp = block.timestamp;
counter = counter + 1;
performData;
}
}