leaseGenerator.sol

constructor () public payable {
    landlordAddress = msg.sender;
    provable_setCustomGasPrice(100000000000);
    OAR = OracleAddrResolverI(0xB7D2d92e74447535088A32AD65d459E97f692222);
}

function fetchUsdRate() internal {
    require(provable_getPrice("URL") < address(this).balance, "Not enough Ether in contract, please add more");
    bytes32 queryId = provable_query("URL", "json(https://api.pro.coinbase.com/products/ETH-USD/ticker).price");
    validIds[queryId] = true;
}

function __callback(bytes32 myId, string memory result) public {
    require(validIds[myId], "Provable query IDs do not match, no valid call was made to provable_query()");
    require(msg.sender == provable_cbAddress(), "Calling address does match usingProvable contract address ");
    validIds[myId] = false;
    ETHUSD = parseInt(result);

    if (workingState == State.payingLeaseDeposit) {
        _payLeaseDeposit();
    } else if (workingState == State.payingLease) {
        _payLease();
    } else if (workingState == State.collectingLeaseDeposit) {
        _collectLeaseDeposit();
    } else if (workingState == State.reclaimingLeaseDeposit) {
        _reclaimLeaseDeposit();
    }
}