链接: Oracle在Avalanche Testnet Fuji上获取外部API数据

Question

我正在构建一个与chainlink oracle交互以从api调用获取外部数据的智能契约。我在上这样做，它可以使用下面的oracle地址&作业it，但是它不适用于Avalanche

• 网络: Kovan
• 职务名称: Get > Uint256
• Oracle: 0xc57B33452b4F7B189bB5AfaE9cc4aBa1f7a4FD8 (Chainlink Devrel Node)
• 职务ID: d5270d1c311941d0b08bead21fea7747
• 费用: 0.1链接

和

• 网络:雪崩测试网
• 职务名称: Get > Uint256
• Oracle: 0xCC80934EAf22b2C8dBf7A69e8E0D356a7CAc5754 (Chainlink Devrel Node)
• 工作ID: 5ca4fa9b2d64462290abfbda84e38cf4
• 费用: 0.1链接

在下面，您可以找到我使用Remix部署在上的稳固代码&。(在构造函数中，您可以找到脚本的注释。)

以下是已部署的两份合同：

伊瑟姆·科万：https://kovan.etherscan.io/address/0xD20dd5ee7844E27Fa2DD437744f986C121aDDE0f

雪崩富士：https://testnet.snowtrace.io/address/0xfb0368e7a97b2ea12980c3900e9c52806e68e8a6

我注意到，在"events“选项卡上，Kovan上有两个事件：

chainlinkRequested & chainlinkFulfilled

​

关于富士，我只有一件事.

只有chainlinkRequested，所以看起来甲骨文没有返回数据来发出事件: chainlinkFulfilled .

​

请你帮我看一下，把api数据拿回来给智能合同好吗？否则，你有什么文档可以帮助我建立我自己的先知吗？(我已经有了cryptozombies.io文档，所以如果有，请与其他文档共享。)

    // SPDX-License-Identifier: MIT

普拉格玛坚实度^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 APIPlayerScore is ChainlinkClient {
    using Chainlink for Chainlink.Request;
  
    uint256 public playerScore;
    
    address private oracle;
    bytes32 private jobId;
    uint256 private fee;
    
    constructor() {
        //Ethereum Kovan
        setPublicChainlinkToken();
        oracle = 0xc57B33452b4F7BB189bB5AfaE9cc4aBa1f7a4FD8;
        jobId = "d5270d1c311941d0b08bead21fea7747";
        fee = 0.1 * 10 ** 18; // (Varies by network and job)

        //Avalanche Fuji
        //setChainlinkToken(0x0b9d5D9136855f6FEc3c0993feE6E9CE8a297846);
        //oracle = 0xCC80934EAf22b2C8dBf7A69e8E0D356a7CAc5754;
        //jobId = "5ca4fa9b2d64462290abfbda84e38cf4";
        //fee = 0.1 * 10 ** 18;
    }
    
    /**
     * Create a Chainlink request to retrieve API response, find the target
     * data, then multiply by 1000000000000000000 (to remove decimal places from data).
     */
    function requestPlayerScoreData() 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://****database.app/data.json");
        
        // Set the path to find the desired data in the API response, where the response format is:
        // {"player": {
        //            "id": "4291820",
        //            "score": 560
        //        }
        //  }
        request.add("path", "player.score");
        
        
        // Sends the request
        return sendChainlinkRequestTo(oracle, request, fee);
    }
    
    /**
     * Receive the response in the form of uint256
     */ 
    function fulfill(bytes32 _requestId, uint256 _score) public recordChainlinkFulfillment(_requestId)
    {
        playerScore = _score;
    }

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

Answer 1

我成功地通过使用Frensprotocol oracle实现了来自智能契约的外部API调用。文档帮了忙。要使Oracle正常工作，您可以在不和谐或Twitter上与他们的团队联系。