Ethereum: Create/set “subId” by createSubscription() and get “subId” vrfCoordinatorV2_5Mock calling by javascript in hardhat environment

I can provide you with an article based on the given specification. Please note that I’ll assume that the createSubscription(), getSubId() functions are already implemented and available in the JavaScript code.

Ethereum: Creating & Setting SubIds Using VRF Coordinators

In this article, we will explore how to create and set subids using VRF (Verifiable Random Function) coordinators in a hardhat environment.

Overview of Hardhat Environment

Hardhat is a popular Ethereum development framework that allows us to build and deploy smart contracts on the Ethereum network. It provides an easy-to-use interface for interacting with the Ethereum blockchain, making it ideal for rapid prototyping and development.

Creating & Setting Subids using VRF Coordinators

To create subids using VRF coordinators in hardhat, we need to:

• Import necessary dependencies

• Set up our network configuration

• Create a VRFCoordinator instance

• Call the createSubscription() function and pass it as an argument to the setSubId method

• Get the subid using the getSubId method

Hardhat Deployment Script (deploy.js)

const { network, ethers } = require("@nomiclab/hardhat");


// Set up our network configuration

const networks = {

  hardhat: {

    chainId: 1337,

    // Add other network configurations as needed

  },

};


// Import the VRF Coordinator library

const vrfCoordinatorV2_5Mock = require("./vrfCoordinatorV2_5Mock");


async function main() {

  const { getChainId } = await ethers.getContractFactory("your-contract-name");

  const contractInstance = await getChainId();


  // Create a subscription instance with VRF Coordinator

  const subscriptionInstance = await vrfCoordinatorV2_5Mock.createSubscription({

    chainId: contractInstance.chainId,

    provider: network.provider,

  });


  // Set the subscription using the createSubscription() function

  await subscriptionInstance.setSubId("your-sub-id");


  console.log(await vrfCoordinatorV2_5Mock.getSubId());


  // Get the subid using the getSubId method

  const subid = await vrfCoordinatorV2_5Mock.getSubId();


  console.log(subid);

}


slim();

In this script, we first import the necessary dependencies and set up our network configuration. We then create a VRFCoordinator instance with VRF Coordinator version 2.5 Mock.

Next, we create a subscription instance using the createSubscription() function and pass it as an argument to the setSubId method. This sets the subid for the specified contract.

We then log the subid using the getSubId method and get the subid by calling the getSubId function directly on the VRF Coordinator instance.

Note:

Replace "your-contract-name" with the actual name of your Ethereum contract, and replace "your-sub-id" with the desired subid value. This script assumes that you have a VRF Coordinator version 2.5 Mock implementation available.