Chainlink 作业没有返回值

Question

我有一个预言机和 JobID，我想提交给预言机以获取 ETH 价格数据。我已经资助了该节点，并且正在遵循文档。但是，每次我请求价格时，我的 BTC 值都不会更新。合同似乎是由 LINK 资助的，我没有收到 gas 错误，但由于某种原因，这个数字不会改变。到底是怎么回事？

solidity
pragma solidity ^0.6.0;
import "github.com/smartcontractkit/chainlink/evm-contracts/src/v0.6/ChainlinkClient.sol";
contract testingData is ChainlinkClient {
  address public owner;
  uint256 public btc;
  address ORACLE =  0xB36d3709e22F7c708348E225b20b13eA546E6D9c;
  bytes32 constant JOB = "f9528decb5c64044b6b4de54ca7ea63e";
  uint256 constant private ORACLE_PAYMENT = 1 * LINK;
  constructor() public {
    setPublicChainlinkToken();
    owner = msg.sender;
  }
  function getBTCPrice() 
    public
    onlyOwner
  {
    Chainlink.Request memory req = buildChainlinkRequest(JOB, address(this), this.fulfill.selector);
    req.add("get", "https://www.alphavantage.co/query?function=CURRENCY_EXCHANGE_RATE&from_currency=BTC&to_currency=USD&apikey=xxxx");
    string[] memory copyPath = new string[](2);
    copyPath[0] = "Realtime Currency Exchange Rate";
    copyPath[1] = "5. Exchange Rate";
    sendChainlinkRequestTo(ORACLE, req, ORACLE_PAYMENT);
  }
  function fulfill(bytes32 _requestId, uint256 _price)
    public
    recordChainlinkFulfillment(_requestId)
  {
    btc = _price;
  }
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }
}

Answer 1

您需要为您的工作添加一个乘法适配器。在您的 中getBTCPrice()，添加一行：

run.addInt("times", 100000000);

在 Solidity 中，小数不起作用，因此每当您从 oracle 获取带小数的数字时，您都需要添加一个乘法适配器，以便它可以理解。

完整代码如下：

solidity
pragma solidity ^0.6.0;
import "github.com/smartcontractkit/chainlink/evm-contracts/src/v0.6/ChainlinkClient.sol";
contract testingData is ChainlinkClient {
  address public owner;
  uint256 public btc;
  address ORACLE =  0xB36d3709e22F7c708348E225b20b13eA546E6D9c;
  bytes32 constant JOB = "f9528decb5c64044b6b4de54ca7ea63e";
  uint256 constant private ORACLE_PAYMENT = 1 * LINK;
  constructor() public {
    setPublicChainlinkToken();
    owner = msg.sender;
  }
  function getBTCPrice() 
    public
    onlyOwner
  {
    Chainlink.Request memory req = buildChainlinkRequest(JOB, address(this), this.fulfill.selector);
    req.add("get", "https://www.alphavantage.co/query?function=CURRENCY_EXCHANGE_RATE&from_currency=BTC&to_currency=USD&apikey=xxxx");
    string[] memory copyPath = new string[](2);
    copyPath[0] = "Realtime Currency Exchange Rate";
    copyPath[1] = "5. Exchange Rate";
    sendChainlinkRequestTo(ORACLE, req, ORACLE_PAYMENT);
  }
  function fulfill(bytes32 _requestId, uint256 _price)
    public
    recordChainlinkFulfillment(_requestId)
  {
    btc = _price;
  }
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }
}