GET API Chainlink 不返回值答案

【问题标题】：GET API Chainlink not returning valueGET API Chainlink 不返回值
【发布时间】：2021-08-17 17:14:22
【问题描述】：

我在下面发布了我的代码。我尝试修改 basic chainlink example 以使用另一个 API。我使用了dummy API，确保更改路径，以便获得一个 uint 并将 LINK 发送到智能合约，但它最终不会返回员工年龄（我认为这不需要乘法操作没有小数）。任何帮助将不胜感激！

// This example code is designed to quickly deploy an example contract using Remix.

pragma solidity ^0.6.0;

import "https://raw.githubusercontent.com/smartcontractkit/chainlink/master/evm-contracts/src/v0.6/ChainlinkClient.sol";

contract APIConsumer is ChainlinkClient {
  
    uint256 public volume;
    
    address private oracle;
    bytes32 private jobId;
    uint256 private fee;
    
    /**
     * Network: Kovan
     * Chainlink - 0x2f90A6D021db21e1B2A077c5a37B3C7E75D15b7e
     * Chainlink - 29fa9aa13bf1468788b7cc4a500a45b8
     * Fee: 0.1 LINK
     */
    constructor() public {
        setPublicChainlinkToken();
        oracle = 0x2f90A6D021db21e1B2A077c5a37B3C7E75D15b7e;
        jobId = "29fa9aa13bf1468788b7cc4a500a45b8";
        fee = 0.1 * 10 ** 18; // 0.1 LINK
    }
    
    /**
     * Create a Chainlink request to retrieve API response, find the target
     * data, then multiply by 1000000000000000000 (to remove decimal places from data).
     ************************************************************************************
     *                                    STOP!                                         * 
     *         THIS FUNCTION WILL FAIL IF THIS CONTRACT DOES NOT OWN LINK               *
     *         ----------------------------------------------------------               *
     *         Learn how to obtain testnet LINK and fund this contract:                 *
     *         ------- https://docs.chain.link/docs/acquire-link --------               *
     *         ---- https://docs.chain.link/docs/fund-your-contract -----               *
     *                                                                                  *
     ************************************************************************************/
    function requestVolumeData() public returns (bytes32 requestId) 
    {
        Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.fulfill.selector);
        
        // Set the URL to perform the GET request on
        request.add("get", "http://dummy.restapiexample.com/api/v1/employees");
        
        // Set the path to find the desired data in the API response, where the response format is:
        // {"RAW":
        //      {"ETH":
        //          {"USD":
        //              {
        //                  ...,
        //                  "VOLUME24HOUR": xxx.xxx,
        //                  ...
        //              }
        //          }
        //      }
        //  }
        request.add("path", "data.0.employee_age");
        
        // Multiply the result by 1000000000000000000 to remove decimals
      //  int timesAmount = 10**18;
    //    request.addInt("times", timesAmount);
        
        // Sends the request
        return sendChainlinkRequestTo(oracle, request, fee);
    }
    
    /**
     * Receive the response in the form of uint256
     */ 
    function fulfill(bytes32 _requestId, uint256 _volume) public recordChainlinkFulfillment(_requestId)
    {
        volume = _volume;
    }
    
    /**
     * Withdraw LINK from this contract
     * 
     * NOTE: DO NOT USE THIS IN PRODUCTION AS IT CAN BE CALLED BY ANY ADDRESS.
     * THIS IS PURELY FOR EXAMPLE PURPOSES ONLY.
     */
    function withdrawLink() external {
        LinkTokenInterface linkToken = LinkTokenInterface(chainlinkTokenAddress());
        require(linkToken.transfer(msg.sender, linkToken.balanceOf(address(this))), "Unable to transfer");
    }
}

【问题讨论】：

标签： chainlink

【解决方案1】：

对垃圾邮件感到抱歉，我最终将值相乘并开始返回。为什么会这样？

request.add("path", "data.0.employee_age");

// Multiply the result by 1000000000000000000 to remove decimals
int timesAmount = 10**5;
request.addInt("times", timesAmount);

【讨论】：

【解决方案2】：

我从 CL 文档中获取了标准 APIConsumer，将 GET 请求的 URL 更改为您的，将路径设置为 data.0.employee_age，然后注释掉在请求中添加“时间”的行，它成功运行, 我回来了 61

【讨论】：