Foundry Smart Contract Lottery

About

Players can enter the raffle by paying in ETH and a random winner will be picked by chainlink nodes.

Workflow

• Checkout the Complete Workflow

Test

forge test

File	% Lines	% Statements	% Branches	% Funcs
script/DeployRaffle.s.sol	100.00% (17/17)	100.00% (21/21)	50.00% (2/4)	100.00% (1/1)
src/Raffle.sol	100.00% (36/36)	100.00% (45/45)	87.50% (7/8)	100.00% (10/10)

or

forge test --rpc-url <RPC_URL>

Test Coverage

forge coverage

forge coverage --report debug > coverage.txt

• To generate lcov report

make generateTestReport

Deploy

This will default to your local node. You need to have it running in another terminal in order for it to deploy.

make deployToAnvil

Deployment to a testnet or mainnet

1. Setup environment variables

• You'll want to set your SEPOLIA_RPC_URL in environment variables. You can add them to a .env file, similar to what you see in .env.example.

2. Use wallet options to Encrypt Private Keys

• Private Key Encryption

Optionally, add your ETHERSCAN_API_KEY if you want to verify your contract on Etherscan.

Get testnet ETH

Head over to faucets.chain.link and get some testnet ETH. You should see the ETH show up in your metamask.

Deploy

make deployToSepolia

This will setup a ChainlinkVRF Subscription for you. If you already have one, update it in the scripts/HelperConfig.s.sol file. It will also automatically add your contract as a consumer.

Register a Chainlink Automation Upkeep

• Documentation

• Go to automation.chain.link and register a new upkeep. Choose Custom logic as your trigger mechanism for automation.

Estimate gas

You can estimate how much gas things cost by running:

forge snapshot

And you'll see an output file called .gas-snapshot

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Demo

Raffle front-end
Github

Thank you :)