This Raffle Lottery contract is designed to create a decentralized and trustless lottery system where participants can enter a raffle by sending Ether. It implements Chainlink VRF for secure and verifiable random number generation as well as Chainlink Automation for scheduled task execution, ensuring a fair and automated drawing process.
1. Chainlink VRF Integration: Utilizes Chainlink's Verifiable Random Function to ensure that the winner selection process is provably fair and tamper-proof.
2. Chainlink Automation: Automates the execution of lottery draws, reducing the need for manual intervention and ensuring timely operations.
3. Checks-Effects-Interactions Pattern: Adopts this common security pattern to prevent reentrancy attacks.
4. Flexible Ticket Pricing: Allows configuration of ticket prices upon deployment.
5. Timed Draws: Configurable intervals for automatic lottery draws.
1. Node.js (v14.x or newer recommended)
2. Foundry for Solidity testing and deployment
3. An Ethereum wallet with Ether for deploying contracts (if deploying to a live network)
1. Raffle.sol: Main contract for raffle management.
2. DeployRaffle.s.sol: Script for deploying the Raffle contract and setting up dependencies.
3. HelperConfig.s.sol: Configuration helper for network-specific settings.
4. Interactions.s.sol: Includes scripts for creating and funding Chainlink VRF subscriptions.
- Clone the repository
git clone https://github.com/your-username/raffle-lottery-contract.git
cd raffle-lottery-contract- Install dependencies
forge install- Compile the contracts
forge buildBefore deploying, configure the network settings and Chainlink parameters in the HelperConfig contract. Update the VRF Coordinator address, gas lane, subscription ID, and callback gas limit according to the network you are deploying to.
Deploy the contracts to your desired network using Foundry: - See MakeFile
forge script script/DeployRaffle.s.sol $(NETWORK_ARGS)This will deploy the Raffle contract and configure it with the necessary Chainlink services.
After deployment, participants can enter the raffle by sending the required Ether amount to the contract. The Chainlink Keeper will automatically trigger the draw based on the predefined interval, and the Chainlink VRF will select a random winner.
Run the automated tests to ensure the contracts work as expected:
forge testThis project uses industry-standard security practices and patterns to ensure the integrity of the raffle process. Review the smart contract code and conduct thorough testing and audits before using in production.
Contributions are welcome! Please feel free to submit pull requests or open issues to improve the code or add new features.