openzeppelin upgrade contract
Upgrading via Multisig A Defender guide on upgrading a smart contract in production secured by a multisig wallet, using Defender Admin and the Hardhat Upgrades plugin. Depends on ethers.js. So it makes sense to just use that particular address. Upgradeable contracts cannot have a constructor. If your contract is going to be deployed with upgradeability, such as using the OpenZeppelin Upgrades Plugins, you will need to use the Upgrade Safe variant of OpenZeppelin Contracts. You can see that the value of the state variable of our contract has been stored as 10 over here, which shows that this is the smart contract responsible for maintaining our implementation contracts state. Initializers const { ethers, upgrades } = require("hardhat"); console.log(atm.address, " atm(proxy) address"); it("should return available balance", async function () {. Once the installation is complete, you should now have everything you need to develop, test and deploy smart contracts on the blockchain. The next section will teach you the best practices when it comes to deploying your contracts. Since well be working with upgradeable smart contracts, we will need to install two more dependencies. Lines 13-16: We can now simply call our function main() which will run the logic in our function. First the variable that holds the contract we want to deploy then the value we want to set. In this guide we dont have an initialize function so we will initialize state using the store function. The method OpenZeppelin uses is the design pattern named "proxy pattern." We will have two deployable contracts. A workaround for this is to declare unused variables or storage gaps in base contracts that you may want to extend in the future, as a means of "reserving" those slots. Available for both Hardhat and Truffle. Therefore, we will also need a Smart Contract Admin proxy, so we are going to use the Transparent Upgradable Proxy OpenZeppelin implementation. If you go back to it, you will find that it is actually the address of our TransparentUpgradeableProxy contract. The purpose of the file was to prevent our sensitive data from being published publicly, thus compromising our assets on the blockchain. This contract holds all the state variable changes for our implementation contract. Why Upgrades? However, for some scenarios, it is desirable to be able to modify them. It is very important to work with this file carefully. Copy the HTTP URL and paste it into the RPC_URL variable in your .env file. my "upgrades" of the implementation proxy appear to be deploying new contracts altogether. At this point, we have successfully deployed and have our proxy and admin address. When you are doing openzeppelin --version you are getting the version of the OpenZeppelin CLI and not the version of OpenZeppelin Contracts that you have installed. We will save this file as scripts/upgrade_box.js. However, nothing prevents a malicious actor from sending transactions to the logic contract directly. Open the Mumbai Testnet explorer, and search for your account address. Creating and approving upgrade proposals with OpenZeppelin Defender Automating smart contract upgrade proposals with Upgrade Plugins and the Defender API You can watch the video, view the slides, upgrade the example contract. Under the agreement, the Nimitz will be dry-docked and receive underwater hull preservation and a renovated living quarters. Basically, there are two contracts: Contract 1 (proxy/point of access): This contract is a proxy or a wrapper that will be interacted with . If you wish to test, your test file should be similar to this. We can then interact with our Box contract to retrieve the value that we stored during initialization. ERC-721 Token Txns. To test upgradeable contracts we should create unit tests for the implementation contract, along with creating higher level tests for testing interaction via the proxy. Then, return to the original page. We would normally test and then deploy to a local test network and manually interact with it. Instructions are available for both Truffle and Hardhat. We will use a multisig to control upgrades of our contract. This makes the storage layouts incompatible, as explained in Writing Upgradeable Contracts. The function __{ContractName}_init_unchained found in every contract is the initializer function minus the calls to parent initializers, and can be used to avoid the double initialization problem, but doing this manually is not recommended. Deploy upgradeable contracts. Also, I see that the new vehicle for using OpenZeppelin is Truffle plugins. Once you have transferred the rights to upgrade a proxy or beacon to another address, you can still use your local setup to validate and deploy the implementation contract. In this guide we will use a Gnosis Safe but you could also use any supported multisig such as a legacy Gnosis MultiSigWallet. So whats happening here? You may want to uninstall the global version of OpenZeppelin CLI. For future upgrades you can deploy the new implementation contract using an EOA with prepareUpgrade and then do the upgrade with Gnosis Safe App.. For UUPS and transparent proxies, use deployProxy and upgradeProxy as shown above. The required number of owners of the multisig can approve the proposal and then finally execute to upgrade our contract. When deploying this contract, we will need to specify the initializer function name (only when the name is not the default of initialize) and provide the admin address that we want to use. In summary, its best for the admin to be a dedicated account only used for its purpose which is obviously to be an admin. Development should include appropriate testing and auditing. We will save this file as scripts/deploy_upgradeable_box.js. You can always chat with us on our Discord community server, featuring some of the coolest developers youll ever meet . Let's begin to write and deploy an upgradeable smart contract. The V2 address was previously logged in your terminal after you ran the upgradeV1.js script. Learning new technology trends,applying them to solve problems is fascinating to me. JavaScript library for the OpenZeppelin smart contract platform Hope you learnt a thing or two. The admin (who can perform upgrades) for our proxy is a ProxyAdmin contract. Lets pause and find out. Truffle Tests (in javascript, with Web3.js, Moralis.io and other test helper libraries). Specifically, we will: Write and deploy an upgradeable contract using the Upgrades Plugin for Hardhat, Transfer upgrade rights to a multisig wallet for additional security, Validate, deploy, and propose a new implementation using Hardhat, Execute the upgrade through the multisig in Defender Admin. The difference with Transparent proxies, in short, is that the upgrade mechanism resides on the implementation, as opposed to the proxy. In the three contract addresses that you opened, click on the contract tab on each of their pages. You can refer to our. Though depending on what version of OpenZeppelin Contracts you had previously used, you may not be able to upgrade versions due to changes with state variables. Upgrades Plugins are only a part of a comprehensive set of OpenZeppelin tools for deploying and securing upgradeable smart contracts. Smart contracts deployed using OpenZeppelin Upgrades Plugins can be upgraded to modify their code, while preserving their address, state, and balance. For the purposes of the guide we will skip ahead to deploying to a public test network. Use the name gap or a name starting with gap_ for the array so that OpenZeppelin Upgrades will recognize the gap: If Base is later modified to add extra variable(s), reduce the appropriate number of slots from the storage gap, keeping in mind Soliditys rules on how contiguous items are packed. If you are returned an address, that means the deployment was successful. Follow us on Twitter @coinmonks and Our other project https://coincodecap.com, Email gaurav@coincodecap.com. Throughout this guide, we will learn: Why upgrades are important Learn more about OpenZeppelin Contracts Upgradeable in Contracts: Using with Upgrades. Open up your terminal, and run these commands in succession: This installs the dotenv library and sets up an .env file in our hardhat project, which we will use to store sensitive data. It usually takes a while to install them all. If you do not have an account, create one here. This allows us to change the contract code, while preserving the state, balance, and address. In total, we received 16 My main question is what doc should I now follow to use the new toolkit to compile and deploy Solidity contracts using Truffle with the new ZOS plugins? One hard rule about developing on the blockchain is that any smart contracts that are deployed cannot be altered. When installing OpenZeppelin Contracts (the latest version is 3.4, see: https://blog.openzeppelin.com/openzeppelin-contracts-3-4/) there is a Solidity 0.6 and a Solidity 0.7 version, as well as upgradeable versions of both. Relating it to regular daily lives, two parties who have signed a contract can decide to change agreements, perhaps they have to remove some terms or add some more or fix mistakes. Whether youre using Hardhat or Truffle, you can use the plugin in your tests to ensure everything works as expected. In our Box example, it means that we can only add new state variables after value. Due to a requirement of the proxy-based upgradeability system, no constructors can be used in upgradeable contracts. Some scenarios call for modification of contracts. If it was OpenZeppelin Contracts Ethereum Package 2.x then you wont be able to upgrade your contract to use OpenZeppelin Contracts Upgradeable 3.x due to state layout changes. The following snippet shows an example deployment script using Hardhat. Do note that only the account that deployed the proxy contracts can call the upgrade function, and that is for obvious reasons. Transfer control of upgrades (ownership of the ProxyAdmin) to a multisig. A subsequent update that adds a new variable will cause that variable to read the leftover value from the deleted one. Now the final steps. Developers writing smart contracts must always ensure that it is all-encompassing, error-free, and covers every edge case. Go into the contracts folder, and delete the pre-existing Greeter.sol file. NPM (Node Package Manager) and Node.js (Version 16.15 recommended) Deploy upgradeable contract. Easily use in tests. See: https://docs.openzeppelin.com/learn/upgrading-smart-contracts Your script should look similar to this, Create a scripts/AtmProxyV2-test.js. In your migrations you are actually deploying a new contract using deployProxy. As a consequence, calling two of these init functions can potentially initialize the same contract twice. OpenZeppelin Hardhat Upgrades API Both deployProxy and upgradeProxy functions will return instances of ethers.js contracts, and require ethers.js contract factories as arguments. Contents Upgrades Alternatives Parameters Configuration Contracts Registry We will create a migration script to deploy our upgradeable Box contract using deployProxy. Transactions. Firstly, we need to add the contracts from OpenZeppelin: yarn add --dev @openzeppelin/contracts The deployment script should look like this: deploy/01_Deploy_MyContract.ts Prerequisite: knowledge of how to set up dev environment and how to write smart contracts. A variant of the popular OpenZeppelin Contracts library, with all of the necessary changes specific to upgradeable contracts. On Ethereum, they may desire to alter a smart contract to fix a bug they found (which might even lead to a hacker stealing their funds! We then need to configure Hardhat to use our @openzeppelin/hardhat-upgrades plugin. Any user of the smart contract always interacts with the proxy, which never changes its address. The Contract Address 0x195377f82A83Fad3294f49ba62679dD5E2B9BA15 page allows users to view the source code, transactions, balances, and analytics for the contract . Confirm that you are in the project directory (e.g, UpgradeableContracts) and then run this command in your terminal: If you did everything correctly, the terminal should tell you that it has compiled two solidity files successfully. Notice how the value of the Box was preserved throughout the upgrade, as well as its address. A chapter about upgrades in our Learn series, a guided journey through smart contract development. ERC-20 Token Txns. Create another file in the contracts folder, and name it contractV2.sol. Create a contracts directory in our project root and then create Box.sol in the contracts directory with the following Solidity code. UUPS and beacon proxies do not use admin addresses. To quickly verify the contract, run this command in the terminal: If you have named your files or contracts differently from us, edit that command accordingly. How do I get the latest 3.4.0 version of OpenZeppelin running on my PC? Only the owner of the ProxyAdmin can upgrade our proxy. For more details on the different proxy patterns available, see the documentation for Proxies. Using EOA for the prepareUpgrade makes sense.. Transactions require gas for execution, so make sure to have some ETH available. Thats it. Explaining the differences between the Transparent Proxy Pattern and the newly available UUPS Proxies. Execute a clean: npx hardhat clean. The Proxy Pattern At a high level, the proxy upgrade pattern involves deploying a proxy contract that delegates function calls to your logic and storage contracts.