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Blockchain Smart Contracts with Solidity · Ders

UUPS Proxy Kalıbını Uygulama

Güvenli sözleşme yükseltmeleri için OpenZeppelin kullanarak Evrensel Yükseltilebilir Proxy Standardı'nı (UUPS) uygulamayı öğrenin.

UUPS Proxy Kalıbını Uygulama, CoddyKit'te ücretsiz bir Blockchain Smart Contracts with Solidity dersidir. Bu, 4 dersinin 2. dersidir. Aşağıdan dersin tamamını ücretsiz okuyabilir, sonra tarayıcıda yerleşik kod editörü ve 7/24 yapay zeka koçu ile uygulamalı olarak pratik yapabilirsin. Bu, Blockchain Smart Contracts with Solidity öğrenme yolunun bir parçasıdır ve ilerlemeniz web ve CoddyKit uygulaması arasında senkronize olur. Blockchain Smart Contracts with Solidity kursu toplamda 4 dersten oluşur.

Bu dersin bazı bölümleri henüz çevrilmemiş olup İngilizce olarak gösterilmektedir.

Understanding UUPS

The Universal Upgradeable Proxy Standard (UUPS) is a popular design pattern for creating upgradeable smart contracts. It allows you to change a contract's logic without changing its address on the blockchain.

This is crucial for fixing bugs, adding new features, or adapting to changing requirements without losing user data or contract state.

How UUPS Works

UUPS uses a proxy contract that holds the contract's state (data) and a separate implementation contract that holds the contract's logic (functions).

  • Proxy Contract: A simple, unchanging contract that forwards calls to the current implementation.
  • Implementation Contract: Contains the actual business logic. This is the contract that gets upgraded.

The key difference in UUPS is that the upgrade logic resides within the implementation contract, not the proxy.

Trusting OpenZeppelin

Implementing upgradeable contracts correctly is complex and prone to errors. That's why we rely on battle-tested libraries like OpenZeppelin Contracts.

OpenZeppelin provides secure and audited implementations of proxy patterns, including UUPS, making it much safer and easier to build upgradeable contracts.

Building UUPS Contracts

To make your contract UUPS-compatible, it needs to inherit from OpenZeppelin's UUPSUpgradeable contract. This base contract provides the necessary functions and modifiers for upgradeability.

Remember, upgradeable contracts use an initializer function instead of a constructor, as the proxy never calls the implementation's constructor directly.

Our First Upgradeable Contract

Here's a basic contract, MyContractV1, ready for UUPS upgrades. Notice it inherits from OpenZeppelin's UUPSUpgradeable. You'll typically install OpenZeppelin contracts via npm and import them.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";

contract MyContractV1 is UUPSUpgradeable {
    // This contract will contain our initial logic
    // We'll add an initializer in the next scene
}

Initializing UUPS Contracts

In upgradeable contracts, you cannot use a regular constructor. The proxy contract is deployed once, and its constructor is called. The implementation contract's constructor is never called when the proxy is deployed or upgraded.

Instead, you use an initializer function. This function is called once, typically right after the proxy is deployed, to set up the initial state of your logic contract.

Initializing State

Let's add an initializer to our MyContractV1. We use __UUPSUpgradeable_init() and __Ownable_init() to properly initialize base contracts, and Reinitializer(1) to prevent multiple initializations.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

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

contract MyContractV1 is Initializable, UUPSUpgradeable, OwnableUpgradeable {
    string public message;

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        _disableInitializers();
    }

    function initialize(string memory initialMessage) public initializer {
        __UUPSUpgradeable_init();
        __Ownable_init(); // Initialize Ownable for access control
        message = initialMessage;
    }

    function setMessage(string memory newMessage) public onlyOwner {
        message = newMessage;
    }

    // Required for UUPS, defines who can upgrade
    function _authorizeUpgrade(address newImplementation) internal override onlyOwner {}
}

Deploying Your UUPS Contract

Deploying UUPS contracts involves using an upgrades plugin (e.g., for Hardhat or Truffle). This plugin handles creating the proxy and linking it to your initial implementation contract.

  • It deploys your implementation contract.
  • It deploys the proxy contract, pointing to your implementation.
  • It calls the initialize function on the proxy.

This process ensures your contract is correctly set up for future upgrades.

Performing an Upgrade

When you want to upgrade your contract, you deploy a new version of your implementation contract (e.g., MyContractV2). Then, you call an upgrade function on the existing proxy contract, telling it to point to the new implementation.

The _authorizeUpgrade function in your implementation contract controls who has permission to perform this upgrade, often restricted to the contract owner.

Upgrading Your Logic

Let's imagine we want to add a new feature to MyContractV1. We create MyContractV2, inheriting from MyContractV1 to carry over its state and existing logic. We then add our new function.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "./MyContractV1.sol"; // Assuming MyContractV1 is in the same directory

contract MyContractV2 is MyContractV1 {
    uint public counter; // New state variable

    // We don't need a new initializer unless we have new base contracts
    // to initialize, or specific V2 setup.

    function incrementCounter() public onlyOwner {
        counter++;
    }

    // Existing functions like setMessage and message getter are still available
    // via the proxy, using the logic from MyContractV2.
}

UUPS Key Concepts

Which of the following statements are TRUE regarding the Universal Upgradeable Proxy Standard (UUPS) implemented with OpenZeppelin?

UUPS: Secure Upgrades

In this lesson, you learned about the Universal Upgradeable Proxy Standard (UUPS) and how to implement it using OpenZeppelin Contracts.

  • UUPS separates state (proxy) from logic (implementation).
  • You use UUPSUpgradeable as a base contract.
  • initialize functions replace constructors for setup.
  • OpenZeppelin's upgrade plugins simplify deployment and upgrades.

UUPS is a powerful pattern for building future-proof smart contracts!

Sıkça Sorulan Sorular

“UUPS Proxy Kalıbını Uygulama” dersi ücretsiz mi?

Evet — “UUPS Proxy Kalıbını Uygulama” dersin tüm metni burada web'de ücretsiz olarak okunabilir. Etkileşimli olarak pratik yapmak (yerleşik kod editörü ve 7/24 yapay zeka koçu) ve Blockchain Smart Contracts with Solidity kursunun geri kalanını açmak için CoddyKit PRO'ya yükselt. Blockchain Smart Contracts with Solidity kursu toplamda 4 dersten oluşur.

“UUPS Proxy Kalıbını Uygulama” dersinde ne öğreneceğim?

Güvenli sözleşme yükseltmeleri için OpenZeppelin kullanarak Evrensel Yükseltilebilir Proxy Standardı'nı (UUPS) uygulamayı öğrenin. Blockchain Smart Contracts with Solidity ile uygulamalı kodu tarayıcıda doğrudan çalıştırarak pratik yaparsın ve 7/24 yapay zeka koçu dersi çalışırken sorularını yanıtlar.

Blockchain Smart Contracts with Solidity öğrenmeye başlamak için deneyim gerekli mi?

Önceden deneyim gerekmez. CoddyKit'te Blockchain Smart Contracts with Solidity, başlangıçtan ileri seviyeye kadar yapılandırıldığı için buradan başlayabilir veya başından başlayıp kendi hızında ilerleme yapabilirsin. Bu, 4 dersinin 2. dersidir.

“UUPS Proxy Kalıbını Uygulama” dersi ne kadar sürer?

Çoğu CoddyKit dersi yaklaşık 5–10 dakika sürer. Her biri kısa ve etkileşimli olduğu için sabit ilerleme yaparsın ve web ile uygulama arasında tam olarak bıraktığın yerden devam edebilirsin.

Bu Blockchain Smart Contracts with Solidity dersinde kod yazıp çalıştırabilir miyim?

Evet. Her Blockchain Smart Contracts with Solidity dersi yerleşik bir kod editörü içerir, bu sayede tarayıcıda gerçek kod yazıp çalıştırabilir ve anlık yapay zeka geri bildirimi alırsın — yerel kurulum gerekli değildir.

Bu kursun tüm dersleri

  1. Yükseltilebilir Sözleşmeler Neden Gerekli?
  2. UUPS Proxy Kalıbını Uygulama
  3. Diamond Standardı (Çok Cepheli Proxy'ler)
  4. Şeffaf Vekil Kalıbı ve Depolama Düzeni
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