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requestDataSingleNode.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.6.0;

import "https://github.com/smartcontractkit/chainlink/blob/develop/evm-contracts/src/v0.6/ChainlinkClient.sol";

contract ChainlinkExample is ChainlinkClient {
    uint256 public currentPrice;
    address public owner;
    address public ORACLE_ADDRESS = 0x2f90A6D021db21e1B2A077c5a37B3C7E75D15b7e;
    bytes32 constant JOBID = "29fa9aa13bf1468788b7cc4a500a45b8";
    uint256 constant private ORACLE_PAYMENT = 0.1 * 10 ** 18;
    
    constructor() public {
        setPublicChainlinkToken();
        owner = msg.sender;
    }
    
    function requestEthereumPrice() public onlyOwner{
        Chainlink.Request memory req = buildChainlinkRequest(JOBID, address(this), this.fulfill.selector);
        req.add("get", "https://min-api.cryptocompare.com/data/price?fsym=ETH&tsyms=USD");
        req.add("path", "USD");
        req.addInt("times", 100);
        sendChainlinkRequestTo(ORACLE_ADDRESS, req, ORACLE_PAYMENT);
    }
    
    function fulfill(bytes32 _requestId, uint256 _price) public recordChainlinkFulfillment(_requestId){
        currentPrice = _price;
    }
    
    modifier onlyOwner(){
        require(msg.sender == owner);
        _;
    }
    
}