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https://github.com/patrickalphac/decentralized-raffle
https://github.com/patrickalphac/decentralized-raffle
blockchain chainlink ethereum
Last synced: 7 days ago
JSON representation
- Host: GitHub
- URL: https://github.com/patrickalphac/decentralized-raffle
- Owner: PatrickAlphaC
- Created: 2021-10-17T01:31:57.000Z (about 3 years ago)
- Default Branch: main
- Last Pushed: 2021-11-16T17:02:22.000Z (about 3 years ago)
- Last Synced: 2023-03-04T01:09:11.037Z (over 1 year ago)
- Topics: blockchain, chainlink, ethereum
- Language: TypeScript
- Homepage:
- Size: 415 KB
- Stars: 15
- Watchers: 1
- Forks: 5
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# Decentralized Raffle
# Quickstart
## Requirements
- [nodejs](https://nodejs.org/en/)
- [NPM](https://www.npmjs.com/) or [YARN](https://yarnpkg.com/)
## Installation
```sh
git clone https://github.com/PatrickAlphaC/decentralized-raffle.git
cd decentralized-raffle
yarn
```
### Deploy contracts
```sh
npx hardhat deploy
```
### Deploy and start a local node
```sh
npx hardhat node
```
### Deploy to Kovan
To deploy to a testnet or a live network, you need the following environment variables:
1. KOVAN_RPC_URL=https://eth-ropsten.alchemyapi.io/v2/
2. PRIVATE_KEY=0xabc123abc123abc123abc123abc123abc123abc123abc123abc123abc123abc1
Your `KOVAN_RPC_URL` is the URL of your blockchain node, for example, from [alchemy](https://www.alchemy.com/).
Your `PRIVATE_KEY` is the private key of your metamask or cryptowallet. Make sure it starts with `0x`. You might have to add `0x` if you're pulling the key from something like metamask.
You can set them in a file named `.env`. You can follow the example of `.env.example` of what the contents of that file will look like.
You'll also need testnet ETH and testnet LINK. You can [find both here.](https://faucets.chain.link/)
Once you do so, you can run:
```
npx hardhat deploy --network kovan
```
Fund your contract with LINK.
```
npx hardhat fund-link --contract insert-contract-address-here --network kovan
```
And enter your raffle
```
npx hardhat run scripts/enter.ts --network kovan
```
### Add keepers
Once you deploy to Kovan, you can register your contract with the kovan keepers registry. Please [follow the documentation](https://docs.chain.link/docs/chainlink-keepers/compatible-contracts/) for more information.
```sh
npx hardhat deploy --network kovan
```
And you can verify once you have an [`ETHERSCAN_API_KEY`](https://etherscan.io/apis)
Add this configuration in the file named `.env`:
```javascript
ETHERSCAN_API_KEY=
```
The command to verify the source code in Etherscan is:
```sh
npx hardhat verify --network mainnet DEPLOYED_CONTRACT_ADDRESS args...
```
The contract `Raffle` receives these arguments in his constructor:
```solidity
address _vrfCoordinator,
address _linkToken,
bytes32 _keyHash,
uint256 _chainlinkFee,
uint256 _entranceFee,
uint256 _interval
```
Get the deploy's arguments in the file [helper-hardhat-config.ts](./helper-hardhat-config.ts).
Find the network kovan (42). Per example:
```javascript
42: {
name: 'kovan',
linkToken: '0xa36085F69e2889c224210F603D836748e7dC0088',
keyHash:
'0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4',
vrfCoordinator: '0xdD3782915140c8f3b190B5D67eAc6dc5760C46E9',
chainlinkFee: '100000000000000000',
entranceFee: '100000000000000000',
fundAmount: '1000000000000000000',
interval: '20'
}
```
Then run this command to verify the source code in Etherscan:
```sh
npx hardhat verify --network kovan
```
## Tests
```sh
npx hardhat test
```