Lesson10: mockOffchain.js Error

[ZahraaHawie]

Hello, when I run yarn hardhat run scripts/mockOffchain.js --network localhost I got this error:

failed to get chainId, falling back on net_version...
HardhatError: HH108: Cannot connect to the network localhost.
Please make sure your node is running, and check your internet connection and networks config
    at HttpProvider._fetchJsonRpcResponse (/Users/macbookpro/Desktop/Web3Development/hardhat-smartcontracts-lottery/node_modules/hardhat/src/internal/core/providers/http.ts:209:15)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at HttpProvider.request (/Users/macbookpro/Desktop/Web3Development/hardhat-smartcontracts-lottery/node_modules/hardhat/src/internal/core/providers/http.ts:84:29)
    at GanacheGasMultiplierProvider._isGanache (/Users/macbookpro/Desktop/Web3Development/hardhat-smartcontracts-lottery/node_modules/hardhat/src/internal/core/providers/gas-providers.ts:317:30)
    at GanacheGasMultiplierProvider.request (/Users/macbookpro/Desktop/Web3Development/hardhat-smartcontracts-lottery/node_modules/hardhat/src/internal/core/providers/gas-providers.ts:306:23)
    at ChainIdValidatorProvider._getChainIdFromEthNetVersion (/Users/macbookpro/Desktop/Web3Development/hardhat-smartcontracts-lottery/node_modules/hardhat/src/internal/core/providers/chainId.ts:33:17)
    at ChainIdValidatorProvider._getChainId (/Users/macbookpro/Desktop/Web3Development/hardhat-smartcontracts-lottery/node_modules/hardhat/src/internal/core/providers/chainId.ts:17:25)
    at ChainIdValidatorProvider.request (/Users/macbookpro/Desktop/Web3Development/hardhat-smartcontracts-lottery/node_modules/hardhat/src/internal/core/providers/chainId.ts:55:29)
    at DeploymentsManager.getChainId (/Users/macbookpro/Desktop/Web3Development/hardhat-smartcontracts-lottery/node_modules/hardhat-deploy/src/DeploymentsManager.ts:443:23)
    at DeploymentsManager.loadDeployments (/Users/macbookpro/Desktop/Web3Development/hardhat-smartcontracts-lottery/node_modules/hardhat-deploy/src/DeploymentsManager.ts:619:17)

    Caused by: Error: connect ECONNREFUSED 127.0.0.1:8545
        at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1187:16)

Note that when I run the same command on Rinkeby Network it works by giving this: No upkeep needed

Here is my code:

hardhat.config.js

require("@nomiclabs/hardhat-waffle");
require("@nomiclabs/hardhat-etherscan");
require("hardhat-deploy");
require("solidity-coverage");
require("hardhat-gas-reporter");
require("hardhat-contract-sizer");
require("dotenv").config();

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

const MAINNET_RPC_URL =
    process.env.MAINNET_RPC_URL ||
    process.env.ALCHEMY_MAINNET_RPC_URL ||
    "https://eth-mainnet.alchemyapi.io/v2/your-api-key";
const RINKEBY_RPC_URL =
    process.env.RINKEBY_RPC_URL || "https://eth-rinkeby.alchemyapi.io/v2/your-api-key";
const KOVAN_RPC_URL =
    process.env.KOVAN_RPC_URL || "https://eth-kovan.alchemyapi.io/v2/your-api-key";
const POLYGON_MAINNET_RPC_URL =
    process.env.POLYGON_MAINNET_RPC_URL || "https://polygon-mainnet.alchemyapi.io/v2/your-api-key";
const PRIVATE_KEY = process.env.PRIVATE_KEY || "0x";
// optional
const MNEMONIC = process.env.MNEMONIC || "your mnemonic";

// Your API key for Etherscan, obtain one at https://etherscan.io/
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY || "Your etherscan API key";
const POLYGONSCAN_API_KEY = process.env.POLYGONSCAN_API_KEY || "Your polygonscan API key";
const REPORT_GAS = process.env.REPORT_GAS || false;

module.exports = {
    defaultNetwork: "hardhat",
    networks: {
        hardhat: {
            // // If you want to do some forking, uncomment this
            // forking: {
            //   url: MAINNET_RPC_URL
            // }
            chainId: 31337,
        },
        localhost: {
            chainId: 31337,
        },
        kovan: {
            url: KOVAN_RPC_URL,
            accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
            //accounts: {
            //     mnemonic: MNEMONIC,
            // },
            saveDeployments: true,
            chainId: 42,
        },
        rinkeby: {
            url: RINKEBY_RPC_URL,
            accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
            //   accounts: {
            //     mnemonic: MNEMONIC,
            //   },
            saveDeployments: true,
            chainId: 4,
        },
        mainnet: {
            url: MAINNET_RPC_URL,
            accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
            //   accounts: {
            //     mnemonic: MNEMONIC,
            //   },
            saveDeployments: true,
            chainId: 1,
        },
        polygon: {
            url: POLYGON_MAINNET_RPC_URL,
            accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
            saveDeployments: true,
            chainId: 137,
        },
    },
    etherscan: {
        // yarn hardhat verify --network <NETWORK> <CONTRACT_ADDRESS> <CONSTRUCTOR_PARAMETERS>
        apiKey: {
            rinkeby: ETHERSCAN_API_KEY,
            kovan: ETHERSCAN_API_KEY,
            polygon: POLYGONSCAN_API_KEY,
        },
    },
    gasReporter: {
        enabled: REPORT_GAS,
        currency: "USD",
        outputFile: "gas-report.txt",
        noColors: true,
        // coinmarketcap: process.env.COINMARKETCAP_API_KEY,
    },
    contractSizer: {
        runOnCompile: false,
        only: ["Raffle"],
    },
    namedAccounts: {
        deployer: {
            default: 0, // here this will by default take the first account as deployer
            1: 0, // similarly on mainnet it will take the first account as deployer. Note though that depending on how hardhat network are configured, the account 0 on one network can be different than on another
        },
        player: {
            default: 1,
        },
    },
    solidity: {
        compilers: [
            {
                version: "0.8.7",
            },
            {
                version: "0.4.24",
            },
        ],
    },
    mocha: {
        timeout: 500, // 500 seconds max for running tests
    },
};

helper-hardhat-config.js:

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

const networkConfig = {
    default: {
        name: "hardhat",
        keepersUpdateInterval: "30",
    },
    31337: {
        //no vrfCoordinatorV2 because we gonna deploy it as mocks
        name: "localhost",
        //doesn't care about gasLane
        gasLane: "0xd89b2bf150e3b9e13446986e571fb9cab24b13cea0a43ea20a6049a85cc807cc", // 30 gwei
        keepersUpdateInterval: "30",
        raffleEntranceFee: "100000000", // 0.1 ETH
        callbackGasLimit: "500000", // 500,000 gas
    },
    4: {
        name: "rinkeby",
        subscriptionId: "7515",

        gasLane: "0xd89b2bf150e3b9e13446986e571fb9cab24b13cea0a43ea20a6049a85cc807cc", // 30 gwei
        keepersUpdateInterval: "30",
        raffleEntranceFee: "100000000000000000", // 0.1 ETH
        callbackGasLimit: "500000", // 500,000 gas
        vrfCoordinatorV2: "0x6168499c0cFfCaCD319c818142124B7A15E857ab",
    },
    1: {
        name: "mainnet",
        keepersUpdateInterval: "30",
    },
};

const developmentChains = ["hardhat", "localhost"];
const VERIFICATION_BLOCK_CONFIRMATIONS = 6;
const frontEndContractsFile = "../nextjs-raffle/constants/contractAddresses.json";
const frontEndAbiFile = "../nextjs-raffle/constants/abi.json";

module.exports = {
    networkConfig,
    developmentChains,
    VERIFICATION_BLOCK_CONFIRMATIONS,
    frontEndContractsFile,
    frontEndAbiFile,
};

The rest code is the same as Github Lesson 10 Repository.

Any help? Thank you.

@PatrickAlphaC @ali-thegilfoyle

[alymurtazamemon]

@zahraha97 is your node running?

[ZahraaHawie]

Thanks @ali-thegilfoyle . Yes I forget to run the node on a separate window. But any idea of why I'm not getting the winner? The output was : No upkeep needed!

[krakxn]

@zahraha97 You should:

Run yarn hardhat node in your terminal. Leave the process running.
Open a new terminal window.
Run yarn hardhat run [script-name] --network localhost

[ZahraaHawie]

@krakxn That works yes. Thanks.
But I got this:

No upkeep needed!

Why I don't get the recent winner?

[krakxn]

1: That's great!

2: Could you send the describe method where you check upkeep? Thanks.

[mauro1972]

@zahraha97 to fix the No upkeeo Nedeed message, make sure you get the right chainId for the localhost network