Jackpot Playground

This repository contains a sample project made mainly to learn something about Solidity, Chainlink ecosystem and Hardhat.
It is based on:
https://github.com/pappas999/chainlink-hardhat-box
https://github.com/nomiclabs/hardhat-hackathon-boilerplate
and reuse a lot of them.

It is a dummy lottery. The user buys a ticket in one transaction and then draws a lot in another one, wins or loses.
It is not the best implementation of the lottery on Ethereum, it may be the worst one or at least too verbose one.

Requirements

• NPM

Installation

npm install

Default netowrk: kovan

Set environmental variables:

export KOVAN_RPC_URL='www.infura.io/asdfadsfafdadf'
export PRIVATE_KEY='abcdef'
export ALCHEMY_MAINNET_RPC_URL="https://eth-mainnet.alchemyapi.io/v2/your-api-key"

Building

npx hardhat compile

Unit testing

npx hardhat test --network hardhat 

Deploying - both contracts

npx hardhat deploy

Funding RandomVRF contract with link token

It needs that to take random numbers from an oracle.

npx hardhat fund-link --contract insert-vrf-contract-address-here

Interaction

Buying the lottery ticket for i.e. 0.05 ETH

npx hardhat buy-ticket --contract insert-contract-address-here

Roll - something like rolling a dice

npx hardhat roll --contract insert-contract-address-here