Ethereum: How to implement Chainlink VRFv2 with Upgradeable Transparent Proxy smart contract?

Here is a draft article on implementing Chainlink VRFv2 with an updatable transparent proxy contract:

Implementing Chainlink VRFv2 with Updateable Transparent Proxy: A Guide

Chainlink VRFv2 (Blockchain Voting) and its variant VRFv2+ (with additional features) offer a more efficient way to interact with decentralized applications (dApps). However, implementing these protocols in an updatable smart contract can be difficult. In this article, we’ll walk you through the process of implementing Chainlink VRFv2 with an updatable transparent proxy contract.

Why implement Chainlink VRFv2?

Before diving into the implementation, it is important to understand why you want to use Chainlink VRFv2 and its variant. These protocols provide a more secure, decentralized way to vote on block rewards and also allow for non-custodial voting platforms.

Updateable Transparent Proxy (UTP)

UTP is an updatable transparent proxy smart contract that allows for seamless updates without compromising the security of the underlying protocol. This is why we will focus on implementing Chainlink VRFv2 with this smart contract:

• Upgradability: UTP provides an upgrade mechanism, which means you can upgrade the smart contract while keeping existing users and their balances intact.

• Transparency

  

  : UTP is designed to be transparent, ensuring that the voting process remains decentralized and fair.

Chainlink VRFv2 implementation with updatable transparent proxy

To implement Chainlink VRFv2 with an updatable transparent proxy smart contract, follow these steps:

Step 1: Configure UTP

Create a new UTP project using Solidity (version 0.6.17 or higher) and Hardhat. You can use the official @hardhat-dev/ethers package to generate the required artifacts.

npx hardhat develop --network ganache

Step 2: Defining the Chainlink VRFv2 proxy contract

Create a new file named ChainlinkVrfProxy.js' and define a proxy contract. This contract will interact with Chainlink's VRF service.

const ethers = require("ethers");
// Import the Chainlink API
const ChainlinkApi = {
vrf: require("@openzeppelin/chainlinks-vrf-proposal-implementation"),
};
class ChainlinkVrfProxy {
async deploy(chainlinkAddress, options) {
// Deployment of the proxy contract using the Hardhatdeployfunction
const deployment = await ethers.getContractFactory("ChainlinkVrfProxy");
this.proxy = await deployment.deploy(
chainlinkAddress,
options
);
}
async callFunction(
proxyAddress,
options,
callbackAddress,
callback ABI
) {
// Call function in Chainlink VRF service
const result = await new ethers.Contract(proxyAddress, callbackABI, this.proxy).call({
...options,
callbackAddress,
callback,
});
return result;
}
}

Create a new file named UpgradeableTransparentProxy.js’ and implement an upgradeable transparent proxy. This contract will allow you to upgrade your Chainlink VRF service without affecting existing users.

“`javascript

const ethers = require(“ethers”);

class UpgradeableTransparentProxy {

constructor(proxyAddress, options) {

this.proxyAddress = proxyAddress;

this.options = options;

}

async upgrade() {

// Check if the proxy contract with the new ABI is already deployed

const existingContractAbi = await this.proxy.getABI();

if (existingContractAbi !== this.options.abi) {

// Update the Chainlink VRF service using the new ABI and parameters

const newContractAbi = await this.proxy.deploy(

this.proxyAddress,

this.options

);

return ethers.utils.abis.

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