How to interact with UUPS upgradeable contract using web3?

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1

I have an ERC20 token already deployed on the Ropsten testnet with two versions.

V1 is a simple unproxied ERC20 token and looks like this:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract MyToken is ERC20, Ownable {
    constructor() ERC20("MyToken", "MTK") {}

    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }
}

I can interact with this contract using web3:

const Web3 = require('web3');
const MyToken = require('./build/contracts/MyToken.json');
const HDWalletProvider = require('@truffle/hdwallet-provider');

const provider = new HDWalletProvider(process.env.ACCOUNT_SECRET, process.env.INFURA_URL);
const web3 = new Web3(provider);
const contract = new web3.eth.Contract(MyToken.abi, process.env.CONTRACT_ADDRESS);

For example, here is a call that retrieves the owner of the contract:

await contract.methods.owner().call();

On the other hand, V2 is a UUPS upgradeable contract which looks like this:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;

import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";

contract MyToken is Initializable, ERC20Upgradeable, OwnableUpgradeable, UUPSUpgradeable {
    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() initializer {}

    function initialize() initializer public {
        __ERC20_init("MyToken", "MTK");
        __Ownable_init();
        __UUPSUpgradeable_init();
    }

    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }

    function _authorizeUpgrade(address newImplementation)
        internal
        onlyOwner
        override
    {}
}

To interact with V2 using the same web3 nodejs code, I used the V2 ABI and contract address. However, whenever I retrieve the owner using the same code, it always returns the zero address.

I think the call should be proxied or something, but I don't know how and I can't find resources (docs/tutorials) on this. Please help.

Note: To be clear, I'm not trying to upgrade from V1 to V2. I just used versioning to differentiate them in my post. Also, I use truffle instead of hardhat for migrations and tests.

2

Bumping this thread.

Some more info:

  • Contracts V1 and V2 are generated from wizard.openzeppelin.com. Nothing was modified.
  • V2 passes the get owner, symbol, and name truffle tests.
3

Please use our Upgrades Plugin for Truffle in order to deploy a UUPS contract.

4

Hi, thanks for your response. I've already deployed the contract using truffle upgrades plugins. My problem is interacting with the deployed contract with web3.

5

You need to use V2 ABI but proxy address, not implementation address, which is what you seem to be using based on the effect of getting owner zero.

1 Like
6

Sorry, I wasn't able to check this post earlier. Your solution worked! I know understand. Thank you very much.

7

A post was split to a new topic: How to interact with UUPS upgradeable contract in Foundry?