Sample contract call and getting gas price from the fastgas chainlink contract

sampleContractCall.js

let ethers = require('ethers')

let provider = new ethers.providers.JsonRpcProvider(process.env.KOVAN_RPC_URL)
let address = '0x1510B61ba590751bB5dAa9757Bec1e8A0036E34f'
let abi = [
    {
        "inputs": [
            {
                "internalType": "uint256",
                "name": "userProvidedSeed",
                "type": "uint256"
            }
        ],
        "name": "getRandomNumber",
        "outputs": [
            {
                "internalType": "bytes32",
                "name": "requestId",
                "type": "bytes32"
            }
        ],
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "bytes32",
                "name": "requestId",
                "type": "bytes32"
            },
            {
                "internalType": "uint256",
                "name": "randomness",
                "type": "uint256"
            }
        ],
        "name": "rawFulfillRandomness",
        "outputs": [],
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "bytes32",
                "name": "_keyHash",
                "type": "bytes32"
            },
            {
                "internalType": "uint256",
                "name": "_fee",
                "type": "uint256"
            },
            {
                "internalType": "uint256",
                "name": "_seed",
                "type": "uint256"
            }
        ],
        "name": "requestRandomness",
        "outputs": [
            {
                "internalType": "bytes32",
                "name": "requestId",
                "type": "bytes32"
            }
        ],
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "inputs": [],
        "stateMutability": "nonpayable",
        "type": "constructor"
    },
    {
        "inputs": [],
        "name": "withdrawLink",
        "outputs": [],
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "bytes32",
                "name": "",
                "type": "bytes32"
            }
        ],
        "name": "nonces",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [],
        "name": "randomResult",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [],
        "name": "round",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    }
]


let wallet = new ethers.Wallet(process.env.PRIVATE_KEY, provider)

const aggregatorV3InterfaceABI = [{ "inputs": [], "name": "decimals", "outputs": [{ "internalType": "uint8", "name": "", "type": "uint8" }], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "description", "outputs": [{ "internalType": "string", "name": "", "type": "string" }], "stateMutability": "view", "type": "function" }, { "inputs": [{ "internalType": "uint80", "name": "_roundId", "type": "uint80" }], "name": "getRoundData", "outputs": [{ "internalType": "uint80", "name": "roundId", "type": "uint80" }, { "internalType": "int256", "name": "answer", "type": "int256" }, { "internalType": "uint256", "name": "startedAt", "type": "uint256" }, { "internalType": "uint256", "name": "updatedAt", "type": "uint256" }, { "internalType": "uint80", "name": "answeredInRound", "type": "uint80" }], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "latestRoundData", "outputs": [{ "internalType": "uint80", "name": "roundId", "type": "uint80" }, { "internalType": "int256", "name": "answer", "type": "int256" }, { "internalType": "uint256", "name": "startedAt", "type": "uint256" }, { "internalType": "uint256", "name": "updatedAt", "type": "uint256" }, { "internalType": "uint80", "name": "answeredInRound", "type": "uint80" }], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "version", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "stateMutability": "view", "type": "function" }]
const priceFeedAddr = "0x562C092bEb3a6DF77aDf0BB604F52c018E4f2814" // swap this for the fast gas address
let priceFeed = new ethers.Contract(priceFeedAddr, aggregatorV3InterfaceABI, wallet)
let gasPrice = 30000000000
const main = async () => {
    roundData = await priceFeed.latestRoundData()
    // gasPrice = roundData['1'] // this is what you'll use
    console.log("Gas Price is now " + gasPrice)
    let overrides = {
        // The price (in wei) per unit of gas
        gasPrice: gasPrice, // Set the price based on the fast gas here
    }

    let contract = new ethers.Contract(address, abi, wallet)
    let contractWithSigner = contract.connect(wallet)
    let currentValue = await contract.randomResult()
    // console.log(currentValue)

    let tx = await contractWithSigner.getRandomNumber(15, overrides)
    console.log(tx.hash)
    await tx.wait()
    let newValue = await contract.randomResult()
}

main()