链链接 - 以`bytes32`的形式获取API时问题

发布于 2025-01-19 02:02:35 字数 3524 浏览 1 评论 0原文

我一直在学习链条API，并试图修改示例文档以从API获取byets32值。该示例的原始代码运行良好，但是由于API I正在返回byets32 foem，因此需要配置链条作业以处理此类型的返回。该节点 eres with kovan testnet。这是我的代码

pragma solidity ^0.8.7;

import "@chainlink/contracts/src/v0.8/ChainlinkClient.sol";

/**
 * Request testnet LINK and ETH here: https://faucets.chain.link/
 * Find information on LINK Token Contracts and get the latest ETH and LINK faucets here: https://docs.chain.link/docs/link-token-contracts/
 */

/**
 * THIS IS AN EXAMPLE CONTRACT WHICH USES HARDCODED VALUES FOR CLARITY.
 * PLEASE DO NOT USE THIS CODE IN PRODUCTION.
 */
contract APIConsumer is ChainlinkClient {
    using Chainlink for Chainlink.Request;
  
     //Result of the api
     bytes32 public martket;
    
    address private oracle;
    bytes32 private jobId;
    uint256 private fee;
    
    /**
     * Get -> bytes32
     * Network: Kovan
     * Oracle: 0xc57B33452b4F7BB189bB5AfaE9cc4aBa1f7a4FD8 (Chainlink Devrel   
     * Node)
     * Job ID: 7401f318127148a894c00c292e486ffd
     * Fee: 0.1 LINK
     */
    constructor() {
        setPublicChainlinkToken();
        // Get -> bytes32 node taken from documentation
        oracle = 0xc57B33452b4F7BB189bB5AfaE9cc4aBa1f7a4FD8;
        jobId = "7401f318127148a894c00c292e486ffd";
        fee = 0.1 * 10 ** 18; // (Varies by network and job)
    }
    
    /**
     * Create a Chainlink request to retrieve API response, find the target
     * data, then multiply by 1000000000000000000 (to remove decimal places from data).
     */
    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", "https://min-api.cryptocompare.com/data/pricemultifull?fsyms=ETH&tsyms=USD");
        
        // Set the path to find the desired data in the API response, where the response format is:
        // {"RAW":
        //   {"ETH":
        //    {"USD":
        //     {
        //      "MARKET": "CCCAGG",
        //     }
        //    }
        //   }
        //  }
        
        //Get the MARKET field of API
        request.add("path", "RAW,ETH,USD,MARKET"); // Chainlink nodes 1.0.0 and later support this format
        
       
        
        // Sends the request
        return sendChainlinkRequestTo(oracle, request, fee);
    }
    
    /**
     * Receive the response in the form of bytes32
     */ 
    function fulfill(bytes32 _requestId, bytes32 _market) public recordChainlinkFulfillment(_requestId)
    {
        martket = _market;
    }

    // function withdrawLink() external {} - Implement a withdraw function to avoid locking your LINK in the contract
}

市场的值应为byets32在API中显示的“ cccagg”。但是我所得到的只是0x0 ... 00，这意味着Market尚未修改。我已经检查了各种方式，并发现实现功能永远不会得到运行。然后，当我更改jobid和oracle以处理get-＆gt;时，也会发生同样的事情。 int256，get-＆gt; bool（当然，我确实更改了变量的返回类型，以使其与API的返回形式一致）。我还注意到只有作业获取 - ＆gt; UINT256效果很好（文档中的示例也使用了此作业）。有人知道为什么吗？我的代码错误还是问题来自节点/作业？由于我能够正确地说明示例，所以我认为钱包里的问题凸轮不可能。

任何帮助将不胜感激！

原文

I've been learning the chainlink API and trying to modify the example from the Chainlin's documentation to get a byets32 value from an API. The original code of the example works well, but since the API I was hitting is returning a byets32 foem, the Chainlink job need to be configured to handle this type of return. The node is given here with Kovan testnet. Here is my code

pragma solidity ^0.8.7;

import "@chainlink/contracts/src/v0.8/ChainlinkClient.sol";

/**
 * Request testnet LINK and ETH here: https://faucets.chain.link/
 * Find information on LINK Token Contracts and get the latest ETH and LINK faucets here: https://docs.chain.link/docs/link-token-contracts/
 */

/**
 * THIS IS AN EXAMPLE CONTRACT WHICH USES HARDCODED VALUES FOR CLARITY.
 * PLEASE DO NOT USE THIS CODE IN PRODUCTION.
 */
contract APIConsumer is ChainlinkClient {
    using Chainlink for Chainlink.Request;
  
     //Result of the api
     bytes32 public martket;
    
    address private oracle;
    bytes32 private jobId;
    uint256 private fee;
    
    /**
     * Get -> bytes32
     * Network: Kovan
     * Oracle: 0xc57B33452b4F7BB189bB5AfaE9cc4aBa1f7a4FD8 (Chainlink Devrel   
     * Node)
     * Job ID: 7401f318127148a894c00c292e486ffd
     * Fee: 0.1 LINK
     */
    constructor() {
        setPublicChainlinkToken();
        // Get -> bytes32 node taken from documentation
        oracle = 0xc57B33452b4F7BB189bB5AfaE9cc4aBa1f7a4FD8;
        jobId = "7401f318127148a894c00c292e486ffd";
        fee = 0.1 * 10 ** 18; // (Varies by network and job)
    }
    
    /**
     * Create a Chainlink request to retrieve API response, find the target
     * data, then multiply by 1000000000000000000 (to remove decimal places from data).
     */
    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", "https://min-api.cryptocompare.com/data/pricemultifull?fsyms=ETH&tsyms=USD");
        
        // Set the path to find the desired data in the API response, where the response format is:
        // {"RAW":
        //   {"ETH":
        //    {"USD":
        //     {
        //      "MARKET": "CCCAGG",
        //     }
        //    }
        //   }
        //  }
        
        //Get the MARKET field of API
        request.add("path", "RAW,ETH,USD,MARKET"); // Chainlink nodes 1.0.0 and later support this format
        
       
        
        // Sends the request
        return sendChainlinkRequestTo(oracle, request, fee);
    }
    
    /**
     * Receive the response in the form of bytes32
     */ 
    function fulfill(bytes32 _requestId, bytes32 _market) public recordChainlinkFulfillment(_requestId)
    {
        martket = _market;
    }

    // function withdrawLink() external {} - Implement a withdraw function to avoid locking your LINK in the contract
}

The value of market should be a byets32 reprsenting "CCCAGG" as shown in the API. But what I got was just 0x0...00 all the time, which means market has not been modified yet. I've checked this various ways and found out that the fulfill function never get rans. Then same thing happens when I changed the jobId and oracle to handle get-> int256, get -> bool (of course I did change the return type of the variable such that it's consistent with the returning form of API). I also noticed that only the job get -> uint256 works well (the example from documentation also used this job). Does anyon know why? Was my code wrong or the problem came from the node/job? Since I was able the get the example right, I don't think the problem cam from my wallet.

Any help would be appreciated!

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