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# Practical Sample With Hardhat + Solidity
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A fully functional Smart Contract wrriten with ```solidity```, ```node.js``` and using ```Hardhat``` to show usage of all kinds of standard development features, including:
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* running blockchain node in localhost - ```hardhat``` & ```ganache```
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* solidity prettier code beautifier setup
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* standard of developing Smart Contract with ```solidity```
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* standard of developing ```node.js``` script to use ```hardhat``` library efficiently
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* check gas fee & gas price in real-time, with usage of ```coverage```
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* auto verify contract on Etherscan.io
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* creating automate test cases - unit test & staging test
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* creating tasks etc.
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* refactor codes to reduce gas fee
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* write code in best practice, with usage of ```solhint```
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* prettier ```solidity``` & ```node.js``` code
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* gitea version control
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This project mainly to keep as a reference for future Web 3.0 Developments.
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---
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### Success Deploy & Verified Of This Smart Contract To Sepolia Testnet
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0xc2022b56eBC140B5FebCf9FBaB14c17db4C315C4
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https://sepolia.etherscan.io/address/0xc2022b56eBC140B5FebCf9FBaB14c17db4C315C4#code
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Via deploy.js
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https://sepolia.etherscan.io/address/0x3a827C119e1D746bb3C7bcbbf95c55246C8CcBdd#code
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Via yarn hardhat deploy --network sepolia
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### Public Reported Hacked Code References:
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This website is records of all kind previous hacked smart contract:
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https://rekt.news/leaderboard/
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## 1. Git Version Control
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First time initialize:
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```
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git config --global user.name "hoelee"
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git config --global user.email "[email protected]"
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git init .
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git add .
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git checkout -b main
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git commit -m "Initial Commit"
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git remote set-url origin https://username:[email protected]/hoelee/ethers-simple-storage.git
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git credential-cache exit // Fix Credential Error
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```
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Standard Update:
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```
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git add .
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git commit -m "Describe what changes"
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git push -u origin main
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// After set this, later easier usage via below line
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git push
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git pull
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```
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Development need exlude file can create root file with name .gitignore
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```
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node_modules
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package.json
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img
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artifacts
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cache
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coverage
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.env
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.*
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README.md
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coverage.json
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```
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## 2. Setup Visual Studio Code Development Environment
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Windows need to download install WSL
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```
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wsl --set-default Ubuntu-22.04
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mkdir theProjectFolderName
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cd theProjectFolderName
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code .
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// Install nvm
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curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash
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nvm install 16.14.2
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nvm install node.js
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nvm install 18 // Update node JS to v18
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```
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Visual Studio need to update code setting
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```
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"[solidity]": {
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"editor.defaultFormatter":"NomicFoundation.hardhat-solidity"
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}
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```
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Preparing of solidity development environment:
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```
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corepack enable // Enable yarn
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yarn install solc
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yarn add [email protected]
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yarn solcjs --bin --abi --include-path node_modules/ --base-path . -o . SimpleStorage.sol
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yarn add ethers // Compiler Error, Downgraded to v5.7.2
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yarn add fs-extra
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yarn add dotenv
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yarn add prettier
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yarn add prettier-plugin-solidity
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```
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Preparing of Hardhat Development Environment
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```
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yarn init
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// Manual delete main: index.js in package.json
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yarn add --dev hardhat // Production no need --dev
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nvm install 18
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nvm use 18
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nvm alias default 18
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corepack enable // Enable yarn
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yarn hardhat
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yarn add --dev prettier prettier-plugin-solidity
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yarn add --dev dotenv
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yarn add --dev @nomiclabs/hardhat-etherscan // Auto verify Etherscan Samrt Contract
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yarn add --dev @nomiclabs/hardhat-waffle
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yarn add --dev solhint
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yarn add --dev @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers ethers
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yarn add --dev hardhat-gas-reporter
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yarn add --dev solidity-coverage
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yarn add --dev solhint
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```
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Other Terminal Useful Command 1:
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```
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// For Debuging Hardhat
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npx hardhat --versose
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// For Recompile
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yarn hardhat clean // Or manual delete artifacts & cache folder
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npm install
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// For Listing Hardhat Local Blockchain node
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yarn hardhat accounts
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yarn hardhat node // Run in Dedicated Terminal, Getting Blockchain server
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yarn hardhat console --network localhost // Short Life To Test Solidity Code In Terminal
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yarn hardhat compile
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yarn hardhat run scripts/deploy.js --network localhost
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yarn hardhat custom-task-name
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// Need create file in /tasks/custom-task-name.js
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// Add import in hardhat.config.js -> requir("/tasks/custom-task-name");
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yarn hardhat test
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yarn hardhat test --grep customSearchKeyword
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// Only will run the test with describe test that contain "customSearchKeyword"
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```
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Other Terminal Useful Command 2:
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```
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// For Getting Gas Used & Gas Price
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yarn hardhat test
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// Will create a file in ./gas-report.txt
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// With .env of etherscan API key
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// For Getting Coverage
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yarn hardhat coverage
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// Checking code usage & tested percentage
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// For Checking Code Best Practice
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yarn solhint contracts/*.sol
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// For Get Fake Price Feed On Localhost & Ganache
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yarn hardhat deploy --tags mocks --network localhost
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```
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Debug ```Node.js``` need to open **Javascript Debug Terminal** first, via ```ctrl + shift + p```
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#### Reduce Gas Used:
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* Prioritize use ```private``` instead of ```public```
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* Use ```constant``` which declare once in constructor
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* Use ```immutable ``` which declare once only
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This is because blockchain will have higher ```read``` and ```store``` gas fee on storage block, lesser in bytes code block.
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## 3. Known Issue
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* Dependencies combination is old, need update...
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* ...
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### Find a bug?
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If you found an issue or would like to submit an improvement to this demo project, please submit an issue using the issues tab above.
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## 4. Well-known Vulnerabilities
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* Reentrancy Attack
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* Locked with modifier while running withdraw function
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* Update variable immediately before call external function
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* Integer Overflow / Underflow
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* Use compiler version >0.8.0 have check in place
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* Front-Running
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* Use average gas fee / off peak times
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* Use commit-reveal schema
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* Use submarine send
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## 5. Other Explored Features
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* Generate Random Words
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* Create subscription at https://vrf.chain.link/ (MetaMask #1)
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* Add Fund To The Created Subsciption Contract (MetaMask #2)
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* Add Consumer
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* Get Subscription ID
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* Open Remix To Prepare Deploy Consumer Contract https://docs.chain.link/vrf/v2-5/migration-from-v2
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* Change To Correct gwei limit hash address at https://docs.chain.link/vrf/v2/subscription/supported-networks
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* Adjust Setting - random words count, confirmation blocks etc.
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* Insert Subscription ID - v2 is uint64 BUT **v2.5 is uint256**
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* Deploy And Get hash address (MetaMask #3)
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* Insert in chainlink consumer (Metamask #4)
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* Ready to use, record down the consumer contract address
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## 6. Looking Web 3.0 Developer For Your Project?
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**Mr Hoelee** is Welcome Web 3.0 Remote Job, Contact Me Immediately Via WhatsApp <a href="https://wa.me/60175885290">+60175885290</a>
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.
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Or You can email <a href="mailto:me@hoelee.com">me@hoelee.com</a> now. Thanks.
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## 7. Like this project?
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If you are feeling generous, buy me a coffee! - <a href="https://buymeacoffee.com/hoelee">buymeacoffee.com/hoelee</a>
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