Why am I receiving the following Chainlink error: cannot estimate gas

Question

我正在尝试按照此处找到的 Chainlink VRF 教程进行操作：https://docs.chain.link/docs/intermediates-tutorial/ 使用安全帽并且在调用 rollDice 函数时运行遇到了这个问题：

Error: cannot estimate gas; transaction may fail or may require manual gas limit (error={"reason":"cannot estimate gas; transaction may fail or may require manual gas limit","code":"UNPREDICTABLE_GAS_LIMIT","method":"estimateGas","transaction":{"from":"0x014Da1D627E6ceB555975F09D26B048644382Ac6","maxPriorityFeePerGas":{"type":"BigNumber","hex":"0x9502f900"},"maxFeePerGas":{"type":"BigNumber","hex":"0x9502f90e"},"to":"0x5887946875A01D1BB79d6Fb357BceeA5A0096D2e","data":"0xdd02d9e5000000000000000000000000014da1d627e6ceb555975f09d26b048644382ac6","type":2,"accessList":null}}, tx={"data":"0xdd02d9e5000000000000000000000000014da1d627e6ceb555975f09d26b048644382ac6","to":{},"from":"0x014Da1D627E6ceB555975F09D26B048644382Ac6","type":2,"maxFeePerGas":{"type":"BigNumber","hex":"0x9502f90e"},"maxPriorityFeePerGas":{"type":"BigNumber","hex":"0x9502f900"},"nonce":{},"gasLimit":{},"chainId":{}}, code=UNPREDICTABLE_GAS_LIMIT, version=abstract-signer/5.5.0)
    at Logger.makeError (/Users/matt/Desktop/hardhat/randomDay/node_modules/@ethersproject/logger/src.ts/index.ts:225:28)
    at Logger.throwError (/Users/matt/Desktop/hardhat/randomDay/node_modules/@ethersproject/logger/src.ts/index.ts:237:20)
    at /Users/matt/Desktop/hardhat/randomDay/node_modules/@ethersproject/abstract-signer/src.ts/index.ts:301:31
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async Promise.all (index 7)

我能够部署到 Kovan 测试网，我能够验证合约，并且我已经发送了合约 LINK 代币，但我仍然运行进入问题。合同可以在这里查看：https://kovan.etherscan.io/address/0x7b72d80670512c87605ab8ac7e6113fda9c57de4#code

我正在使用 Chainlink 合约的 0.8 版。

RandomDay.sol

pragma solidity ^0.8.9;

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

contract RandomDay is VRFConsumerBase {
    
    uint256 private constant ROLL_IN_PROGRESS = 42;
    bytes32 private s_keyHash;
    uint256 private s_fee;

    mapping(bytes32 => address) private s_rollers;
    mapping(address => uint256) private s_results;

    event DiceRolled(bytes32 indexed requestId, address indexed roller);
    event DiceLanded(bytes32 indexed requestId, uint256 indexed result);

    constructor(address vrfCoordinator, address link, bytes32 keyHash, uint256 fee) VRFConsumerBase(vrfCoordinator, link) {
        s_keyHash = keyHash;
        s_fee = fee;
   
    }

    function rollDice (address roller) public returns (bytes32 requestId) {
        require(LINK.balanceOf(address(this)) >= s_fee, "Not enough LINK to pay fee");
        require(s_results[roller] == 0, "Already rolled");
        requestId = requestRandomness(s_keyHash, s_fee);
        s_rollers[requestId] = roller;
        s_results[roller] = ROLL_IN_PROGRESS;
        emit DiceRolled(requestId, roller);
        return requestId;
    }

    function fulfillRandomness (bytes32 requestId, uint256 randomness) internal override {
        uint256 dayOfWeek = (randomness % 7) + 1;
        s_results[s_rollers[requestId]] = dayOfWeek;
        emit DiceLanded(requestId, dayOfWeek);
    }

    function weekday (address player) public view returns (string memory) {
        require(s_results[player] != 0, "Dice not rolled");
        require(s_results[player] != ROLL_IN_PROGRESS, "Roll in progress");
        return getWeekdayName(s_results[player]);
    }

    function getWeekdayName (uint256 id) private pure returns (string memory) {
        string[7] memory weekdays = [ "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
        return weekdays[id - 1];
    }

}

hardhat.config.js

/**
 * @type import('hardhat/config').HardhatUserConfig
 */

 require("@nomiclabs/hardhat-waffle")
 require("@nomiclabs/hardhat-etherscan")

 const ALCHEMY_API_KEY = "*************************";
 const ROPSTEN_PRIVATE_KEY = "*********************";
 
 module.exports = {
   solidity: "0.8.9",
   networks: {
     kovan: {
       url: `https://eth-kovan.alchemyapi.io/v2/${ALCHEMY_API_KEY}`,
       accounts: [`0x${ROPSTEN_PRIVATE_KEY}`],
       gas: 2700000000,
       maxFeePerGas: 30000000000,
     }
   },
   etherscan: {
    // Your API key for Etherscan
    // Obtain one at https://etherscan.io/
    apiKey: "****************************"
  }
 };

deploy.js

const { ethers } = require("hardhat");

async function main() {
    const [deployer] = await ethers.getSigners();
  
    console.log("Deploying contracts with the account:", deployer.address);
  
    console.log("Account balance:", (await deployer.getBalance()).toString());
  
    const Token = await ethers.getContractFactory("RandomDay");
    const token = await Token.deploy("0xa36085F69e2889c224210F603D836748e7dC0088", "0xdD3782915140c8f3b190B5D67eAc6dc5760C46E9", "0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4", "100000000000000000");
  
    console.log("Token address:", token.address); 
  }
  
  main()
    .then(() => process.exit(0))
    .catch((error) => {
      console.error(error);
      process.exit(1);
    });

quickRun.js

var ethers = require('ethers');
var provider = ethers.providers.getDefaultProvider('kovan');
var address  = '0x7b72d80670512c87605aB8aC7E6113Fda9c57de4';
var abi = [{"inputs":[{"internalType":"address","name":"vrfCoordinator","type":"address"},{"internalType":"address","name":"link","type":"address"},{"internalType":"bytes32","name":"keyHash","type":"bytes32"},{"internalType":"uint256","name":"fee","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"requestId","type":"bytes32"},{"indexed":true,"internalType":"uint256","name":"result","type":"uint256"}],"name":"DiceLanded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"requestId","type":"bytes32"},{"indexed":true,"internalType":"address","name":"roller","type":"address"}],"name":"DiceRolled","type":"event"},{"inputs":[{"internalType":"bytes32","name":"requestId","type":"bytes32"},{"internalType":"uint256","name":"randomness","type":"uint256"}],"name":"rawFulfillRandomness","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"roller","type":"address"}],"name":"rollDice","outputs":[{"internalType":"bytes32","name":"requestId","type":"bytes32"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"player","type":"address"}],"name":"weekday","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"}];
var privateKey = '*******************************';
var wallet = new ethers.Wallet(privateKey, provider);
var contract = new ethers.Contract(address, abi, wallet);

var sendPromise = contract.rollDice('0x014Da1D627E6ceB555975F09D26B048644382Ac6');

sendPromise.then(function(transaction){
  console.log(transaction);
});

Answer 1

我认为地址不对：

你的合约的构造参数： -----解码视图---------------- Arg [0] : vrfCoordinator (地址): 0xa36085f69e2889c224210f603d836748e7dc0088 Arg [1] : link (地址): 0xdd3782915140c8f3b190b5d67eac6dc5760c46e9 Arg [2] : keyHash (bytes32): 0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4 Arg [3]：费用（uint256）：100000000000000000

通过链links 文档：

LINK 0xa36085F69e2889c224210F603D836748e7dC0088 VRF 协调器 0xdD3782915140c8f3b190B5D67eAc6dc5760C46E9 密钥哈希 0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4 费用 0.1 LINK

切换 Link 和 VRF 可能是罪魁祸首。

Answer 2

十分之九是因为您在构造函数中传递了错误的内容或构造函数中的某些内容未正确初始化。编译器检测不到这种事情。

Why am I receiving the following Chainlink error: cannot estimate gas

Why am I receiving the following Chainlink error: cannot estimate gas

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