Lesson 10 mockOffchain.js

[Ed-Marcavage]

I copied and pasted the mockOffchain.js code from Lesson 10, see below:

const { ethers, network } = require("hardhat")

async function mockKeepers() {
    const raffle = await ethers.getContract("Raffle")
    const checkData = ethers.utils.keccak256(ethers.utils.toUtf8Bytes(""))
    const { upkeepNeeded } = await raffle.callStatic.checkUpkeep(checkData)
    if (upkeepNeeded) {
        const tx = await raffle.performUpkeep(checkData)
        const txReceipt = await tx.wait(1)
        const requestId = txReceipt.events[1].args.requestId
        console.log(`Performed upkeep with RequestId: ${requestId}`)
        if (network.config.chainId == 31337) {
            await mockVrf(requestId, raffle)
        }
    } else {
        console.log("No upkeep needed!")
    }
}

async function mockVrf(requestId, raffle) {
    console.log("We on a local network? Ok let's pretend...")
    const vrfCoordinatorV2Mock = await ethers.getContract("VRFCoordinatorV2Mock")
    await vrfCoordinatorV2Mock.fulfillRandomWords(requestId, raffle.address)
    console.log("Responded!")
    const recentWinner = await raffle.getRecentWinner()
    console.log(`The winner is: ${recentWinner}`)
}

mockKeepers()
    .then(() => process.exit(0))
    .catch((error) => {
        console.error(error)
        process.exit(1)
    })

when I run

yarn hardhat run scripts/mockOffchain.js --network localhost

I get

No upkeep needed!
Done in 4.09s.

When I console.log(upkeepNeeded) it is false, and when I console.log(network.config.chainId) it is undefined.

When I run scripts/mockOffchain.js, I now get this error in my browser when a user tries to enter the raffle:

MetaMask - RPC Error: [ethjs-query] while formatting outputs from RPC '{"value":{"code":-32603,"data":{"code":-32603,"message":"Error: VM Exception while processing transaction: reverted with custom error 'Raffle__RaffleNotOpen()'","data":{"message":"Error: VM Exception while processing transaction: reverted with custom error 'Raffle__RaffleNotOpen()'","txHash":"0x3425ad0aa330fa558fa27feb0abb396d36205933103cc489f287ef35b6069111","data":"0xd24a2714"}}}}' 

[alymurtazamemon]

@Ed-Marcavage Make to run a local node in a separate terminal

[Ed-Marcavage]

I have "hh node" running in my project with the raffle smart contract and I have the front end running in my nextjs/ project directory and still get

No upkeep needed!
✨  Done in 4.37s.

As my output for

yarn hardhat run scripts/mockOffchain.js --network localhost

[alymurtazamemon]

@Ed-Marcavage Are you funding the mock contract in the development inside 01-deploy-raffle.js?

[alymurtazamemon]

@Ed-Marcavage Check that otherwise upload it to GitHub and paste the link here.

[Ed-Marcavage]

@ali-thegilfoyle, this issue has been resolved, thanks for the help!

[krakxn]

"when I console.log(network.config.chainId) it is undefined." If you do not have it, add these in hardhat.config.js and then run again:

hardhat: {
            // // If you want to do some forking, uncomment this
            // forking: {
            //   url: MAINNET_RPC_URL
            // }
            chainId: 31337,
        },
        localhost: {
            chainId: 31337,
        },

[Ed-Marcavage]

Thank you so much! This worked and console.log(network.config.chainId) now outputs 31337, however, console.log(upkeepNeeded) is still returning false so...

 if (upkeepNeeded) {
        const tx = await raffle.performUpkeep(checkData)
        const txReceipt = await tx.wait(1)
        const requestId = txReceipt.events[1].args.requestId
        console.log(`Performed upkeep with RequestId: ${requestId}`)
        if (network.config.chainId == 31337) {
            await mockVrf(requestId, raffle)
        }

...is not running. I am not sure why upkeepNeeded is false and not true.

[krakxn]

For upkeepNeeded to be true, the following conditions need to be true:

• The time interval has passed between raffle runs.
• The lottery is open.
• The contract has ETH.
• Implicity, your subscription is funded with LINK.

Hope this helps!

[Ed-Marcavage]

This worked, my raffle had no ETH...thank you for the help!

[oojoseph67]

@Ed-Marcavage @krakxn how do i fund the contract? is it not when users enter the raffle the raffle is funded? cause right now i'm confused

[ashrth]

@oojoseph67 If cahinId was not your issue, and your upkeepNeeded is returning false, then do the following
Step 1. Run node (yarn hardhat node)
Step 2. Open another terminal
Step 3. And run yarn hardhat run scripts/enter.js --network localhost
Step 4. Run yarn hardhat run scripts/mockOffchain.js --network localhost

It might resolve.