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EMAOracleKeeperHub.sol
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EMAOracleKeeperHub.sol
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// SPDX-License-Identifier: GPL-v3-or-later
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "./interfaces/IKeeperCompatible.sol";
import "./interfaces/IEMAOracle.sol";
contract EMAOracleKeeperHub is IKeeperCompatible, Ownable {
using EnumerableSet for EnumerableSet.AddressSet;
EnumerableSet.AddressSet internal _oracles;
address[] internal _dynamicArray; // A hack for implementing a array with modifiable length
modifier useDynamicArray {
_;
delete _dynamicArray;
}
/**
Oracle registration
*/
function addOracle(address oracle) external onlyOwner {
_oracles.add(oracle);
}
function removeOracle(address oracle) external onlyOwner {
_oracles.remove(oracle);
}
/**
Oracle getters
*/
function numOracles() external view returns (uint256) {
return _oracles.length();
}
function isOracle(address query) external view returns (bool) {
return _oracles.contains(query);
}
function getOracleAt(uint256 index) external view returns (address) {
return _oracles.at(index);
}
/**
@inheritdoc IKeeperCompatible
*/
function checkUpkeep(bytes calldata /*checkData*/)
external
override
useDynamicArray
returns (bool upkeepNeeded, bytes memory performData)
{
address[] storage oraclesToUpdate = _dynamicArray;
for (uint256 i = 0; i < _oracles.length(); i++) {
IEMAOracle oracle = IEMAOracle(_oracles.at(i));
(bool updated, ) = oracle.updateAndQuery();
if (updated) {
upkeepNeeded = true;
oraclesToUpdate.push(address(oracle));
}
}
if (upkeepNeeded) {
performData = abi.encode(oraclesToUpdate);
}
}
/**
@inheritdoc IKeeperCompatible
*/
function performUpkeep(bytes calldata performData) external override {
address[] memory oraclesToUpdate = abi.decode(performData, (address[]));
for (uint256 i = 0; i < oraclesToUpdate.length; i++) {
IEMAOracle oracle = IEMAOracle(oraclesToUpdate[i]);
(bool updated, ) = oracle.updateAndQuery();
require(updated, "EMAOracleKeeperHub: oracle not updated");
}
}
}