Warraich

step16a_raffle_lottery_dapp_chainlink/raffle_lottery_dapp-main/.babelrc

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+{
+  "presets": ["es2015", "stage-2", "stage-3"]
+}

step16a_raffle_lottery_dapp_chainlink/raffle_lottery_dapp-main/.env.example

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+PRIVATE_KEYS=a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0
+INFURA_ID=99999999999999999999999999999999

step16a_raffle_lottery_dapp_chainlink/raffle_lottery_dapp-main/.gitignore

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+.env
+.env.local
+build/
+node_modules/

step16a_raffle_lottery_dapp_chainlink/raffle_lottery_dapp-main/README.md

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+### About
+
+Dapp University Simple Blockchain Raffle Ticket Lottery Decentralized Application to run raffles that makes
+use of Verifiable Random Function (VRF) from Chainlink for reliable fair random numbers. A single ticket is chosen as the 
+winner and receives all the funds in the pool at the end of the raffle/lottery. 
+
+Anyone who has been a particiapant in lottery can be able to complete the raffle for a fee, so winner can be paid and raffle resets to allo new one to start play; this avoids the need to have an admin which can be a central point of failure, control, abuse, censorship, manipulation etc. Deployer can earn a percentage fee from the dapp as long as it runs.Blockchain Lotteries ensure fairness, transparency, censorship resistance and more. 
+
+Project is for learning and exploration purposes so better UI, and or logic can be created or extended.
+
+[Read more about getting random number from Chainlink here](https://docs.chain.link/docs/get-a-random-number/)
+
+### Technology Stack and Tools
+
+* [Node Version Manager](https://heynode.com/tutorial/install-nodejs-locally-nvm) - node version manager
+* [Metamask Wallet](https://metamask.io/) - Metamask Wallet
+* [Chainlink](https://chain.link/)- Chainlink Oracles 
+* [VRF](https://docs.chain.link/docs/chainlink-vrf/) - Verifiable Random Function from Chainlink
+* [Truffle](https://www.trufflesuite.com/) - development framework
+* [React](https://reactjs.org/) - front end framework
+* [Solidity](https://docs.soliditylang.org/en/v0.7.4/) - ethereum smart contract language
+* [Ganache](https://www.trufflesuite.com/ganache) - local blockchain development
+* [Web3](https://web3js.readthedocs.io/en/v1.3.0/) - library interact with ethereum nodes 
+* [JavaScript](https://www.javascript.com/) - logic front end and testing smart contracts
+* [Infura](https://infura.io/) - connection to ethereum networks 
+* [Open Zeppelin](https://infura.io/) - smart contract libraries 
+
+##### Folder / Directory Structure (key folders)
+* raffle_lottery_dapp
+  * migrations 
+  * node_modules
+  * public 
+  * src
+    * abis
+    * components
+    * contracts
+    index.js
+  * test
+
+### Machine set up (Optional if you have not setup before or having challenges on your system)
+
+1. Mac & Linux 
+
+- Have python 2.7 installed
+Check if installed using command below
+```sh
+python -V
+```
+If not installed download from python [Python Download](https://www.python.org/downloads/) version 2.7 related to your system
+
+- Download Ganache Graphical User Interface (GUI ) from [Truffle Framework Site](https://www.trufflesuite.com/ganache) choose related to your system 
+
+- Have node-gyp installed
+Check if installed using command below
+```sh
+
+```
+If not installed, install using command below
+```sh
+npm i -g node-gyp
+```
+
+2. Windows machine 
+
+Ignore Step 7 in the document below (document for bootcamp setup but applies to setup ubuntu environment)
+
+- You may need to [Follow the Windows setup steps in this document](https://www.evernote.com/shard/s584/client/snv?noteGuid=960efc37-4e96-f95a-8c19-cc3b39b54836&noteKey=fd3fd7c99f629eb72a29552f16e4c9e8&sn=https%3A%2F%2Fwww.evernote.com%2Fshard%2Fs584%2Fsh%2F960efc37-4e96-f95a-8c19-cc3b39b54836%2Ffd3fd7c99f629eb72a29552f16e4c9e8&title=B00tc%2540mp%2Bwin10%2Benv.)
+
+### Machine set up (Optional if you have not setup before or having challenges on your system)
+
+1. Mac & Linux 
+
+- Have python 2.7 installed
+Check if installed using command below
+```sh
+python -V
+```
+If not installed download from python [Python Download](https://www.python.org/downloads/) version 2.7 related to your system
+
+- Download Ganache Graphical User Interface (GUI ) from [Truffle Framework Site](https://www.trufflesuite.com/ganache) choose related to your system 
+
+- Have node-gyp installed
+Check if installed using command below
+```sh
+
+```
+If not installed, install using command below
+```sh
+npm i -g node-gyp
+```
+
+2. Windows machine 
+
+Ignore Step 7 in the document below (document for bootcamp setup but applies to setup ubuntu environment)
+
+- You may need to [Follow the Windows setup steps in this document](https://www.evernote.com/shard/s584/client/snv?noteGuid=960efc37-4e96-f95a-8c19-cc3b39b54836&noteKey=fd3fd7c99f629eb72a29552f16e4c9e8&sn=https%3A%2F%2Fwww.evernote.com%2Fshard%2Fs584%2Fsh%2F960efc37-4e96-f95a-8c19-cc3b39b54836%2Ffd3fd7c99f629eb72a29552f16e4c9e8&title=B00tc%2540mp%2Bwin10%2Benv.)
+
+### Preconfiguration, Installation and Running project locally 
+
+1. You will need nvm  if not laready installed; so you can use specific version node version 14 and above 
+```sh
+$ curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.37.2/install.sh | bash
+$ source ~/.nvm/nvm.sh
+```
+Restart your terminal
+
+2. Install node v14.16.0 or versions above
+```sh
+$ nvm install 14.16.0 
+$ nvm alias default 14.16.0 
+$ nvm use default
+```
+
+3. Install truffle globally if not installed. 
+Check if installed using 
+```sh
+truffle version
+```
+If not installed install with below 
+```sh
+$ npm install -g truffle
+```
+
+4. Ignore if either installed already! To fork need to use use ganache-cli vs [Ganache GUI](https://www.trufflesuite.com/ganache), install ganache-cli globally. Note that ganache-cli rus on port 8545 and ganache-gui runs on port 7545 as placced in truffle-config.js. 
+Check if ganache-cli installed first with
+```sh
+ganache-cli --version
+```
+If not installed install with below
+```sh
+$ npm install -g ganache-cli
+```
+Run ganache-cli fork of the ethereum mainnet in different terminal and keep running when compiling,testing, migrating, running app etc. Replace account with account with a lot of ETH and LINK e.g 0xbe6977e08d4479c0a6777539ae0e8fa27be4e9d6 [See here](https://etherscan.io/token/0x514910771af9ca656af840dff83e8264ecf986ca#balances)
+```sh
+ganache-cli -f https://mainnet.infura.io/v3/968a6207d32c4262ae008b7b55d0255e --unlock <account>
+```
+
+6. Install yarn if not installed. Check if installed using 
+```sh
+yarn --version
+```
+If not installed install with below
+```sh
+$ npm install --global yarn
+```
+Add packages
+```sh
+yarn install
+```
+
+7. Duplicate the .env.example file and rename it .env. Populate your environment variables .env see .env.example 
+with your infura Id and your privateKey from Metamask account to do deployment e.g first account. 
+
+### Migrating contracts and Testing Locally to Local Ethereum using Ganache
+
+1. Compile,test,  Local Ganache Mainnet Fork
+Ensure ganache is running in seperate terminal. 
+- If using Ganache CLI 
+```sh
+$ truffle compile
+$ truffle test --network development
+```
+Testing of front_end app will be done on Kovan network
+
+### Migrating contracts Ethereum Kovan Network
+Get Kovan ETH into a Metamask account from this [Kovan faucet click here](https://linkfaucet.protofire.io/kovan) or [Other Kovan Faucet Click Here](https://ethdrop.dev/). Copy your Metamask address into site and click "Send Me 0.1 Test ETH"
+
+- Migrate
+```sh
+truffle migrate --network kovan
+```
+You can verify deployment, check transactions etc on [https://kovan.etherscan.io/](https://kovan.etherscan.io/)
+copy the contract address and got to [Chainlink Kovan Faucet](https://linkfaucet.protofire.io/kovan) Enter the contract
+address and request Test Link and Kovan ETH for account. [Read more here from Chainlink about how to fund your contract](https://docs.chain.link/docs/fund-your-contract/)
+
+- Run app locally 
+Remember to have added LINK from above Faucet into deployed contract address
+Remember to copy contract address and get some LINK for fees into it from faucet above. 
+Remember to get some Kovan ETH into a few addresses e.g 3-5 to act as users on the dapp from [Chainlink Kovan Faucet](https://linkfaucet.protofire.io/kovan)
+```sh
+yarn start
+``` 
+Connect Metamask to Kovan network
+
+### Migrating contracts to Ethereum Mainnet Network
+You need to have real value ETH in deploying account in Metamask. 
+- Migrate
+```sh
+truffle migrate --network mainnet
+```
+[View on Mainnet Scan here](https://etherscan.io/)
+
+- Run app locally 
+```sh
+yarn start
+```
+
+### Optional publish front end to Surge
+1. Run build and enter build directory
+```sh
+$ yarn run build
+$ cd build
+```
+2. Install surge globally: 
+```sh
+$ npm i -g surge
+```
+"You may need to Login to surge and create account with email address and a password first time.  
+If you forgot password you can ask for reset on terminal and get password reset link in your email." 
+Select a unique domain name for your project e.g <uniquename>.surge.sh e.g asdfjkl.surge.sh where
+my name of choice is asdfjkl
+
+3. Deploy to surge. 
+```sh
+$ surge --domain asdfjkl.surge.sh
+```
+...and follow the instructions
+
+### Project enhancements and ideas
+
+- UI/UX + leaner smart contract
+- reduce number reloads or calls to blockchain and change only parts that need changing
+- (who funds LINK with no admin, what is incentive) e.g any sender of LINK to contract when it runs out of LINK can earn fees
+- more winners e.g person with most tickets in raffle gets a share of winnings etc
+- assess for security and vulnerabilities

step16a_raffle_lottery_dapp_chainlink/raffle_lottery_dapp-main/migrations/1_initial_migration.js

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+const Migrations = artifacts.require("Migrations");
+
+module.exports = function(deployer) {
+  deployer.deploy(Migrations);
+};

step16a_raffle_lottery_dapp_chainlink/raffle_lottery_dapp-main/migrations/2_deploy_contracts.js

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+const RaffleLottery = artifacts.require("RaffleLottery"); 
+
+module.exports = async (deployer) => {  
+
+  let _VRF
+  let linkRef
+  let _linkToken
+  let _keyHash
+  let _feeLink
+  let _feePercent = 10 // 10%
+  let _ticketPrice = (0.001 *10 **18).toString()
+  let _totalTickets = 10
+  let linkDeposit = (100*10**18).toString()
+  const unlockedAccount = '0xbe6977e08d4479c0a6777539ae0e8fa27be4e9d6' // account with LINK and ETH 
+
+  let miniABI = [
+    {
+      "constant": true,
+      "inputs": [
+        {
+          "name": "_owner",
+          "type": "address"
+        }
+      ],
+      "name": "balanceOf",
+      "outputs": [
+        {
+          "name": "balance",
+          "type": "uint256"
+        }
+      ],
+      "payable": false,
+      "type": "function"
+    },
+    {
+      "constant": false,
+      "inputs": [
+        {
+          "name": "_to",
+          "type": "address"
+        },
+        {
+          "name": "_value",
+          "type": "uint256"
+        }
+      ],
+      "name": "transfer",
+      "outputs": [
+        {
+          "name": "success",
+          "type": "bool"
+        }
+      ],
+      "payable": false,
+      "type": "function"
+    } 
+  ]   
+
+  console.log(deployer.network)
+
+  if(deployer.network === 'kovan') {
+    console.log(`Deploying to KOVAN Network!!!!`)
+    _VRF = '0xdD3782915140c8f3b190B5D67eAc6dc5760C46E9'
+    _linkToken = '0xa36085F69e2889c224210F603D836748e7dC0088'
+    _keyHash = '0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4'
+    _feeLink = (0.1 * 10 ** 18).toString()
+    linkRef  = new web3.eth.Contract(miniABI,_linkToken)
+  } else { // fork of mainnet or using mainnet itself
+    console.log(`Deploying to Mainnet or Mainet Fork Network!!!!`)
+    _VRF = '0xf0d54349aDdcf704F77AE15b96510dEA15cb7952'
+    _linkToken = '0x514910771AF9Ca656af840dff83E8264EcF986CA'
+    _keyHash = '0xaa77729d3466ca35ae8d28b3bbac7cc36a5031efdc430821c02bc31a238af445'
+    _feeLink = (2 * 10 ** 18).toString()
+    linkRef = new web3.eth.Contract(miniABI,_linkToken)
+  }
+
+  await deployer.deploy(
+    RaffleLottery,
+      _feePercent.toString(),
+      _ticketPrice,
+      _totalTickets.toString(),
+      _VRF,
+      _linkToken,
+      _keyHash,
+      _feeLink
+  )
+
+  // Save current deployed network
+  process.env.NETWORK = deployer.network
+
+  const raffleLottery = await RaffleLottery.deployed()
+
+  // Copy deployed contract address and deposit some LINK to pay for fees for VRF use
+  console.log(`DEPLOYED CONTRACT ADDRESS IS: ${raffleLottery.address}`)
+
+  if(deployer.network === 'development') {
+    // Transfer some LINK (e.g 100 LINK to contract)
+    await linkRef.methods.transfer(raffleLottery.address, linkDeposit).send({from: unlockedAccount})
+    const balanceLink = await linkRef.methods.balanceOf(raffleLottery.address).call()
+    console.log(`Balance LINK in contract is: ${balanceLink.toString()}`)
+  } // on Kovan network transfer some LINK into contract or get from a faucet
+
+}

step16a_raffle_lottery_dapp_chainlink/raffle_lottery_dapp-main/package.json

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+{
+  "name": "RaffleLotteryDapp",
+  "version": "0.1.0",
+  "description": "An Ethereum Marketplace",
+  "author": "Panacloud",
+  "dependencies": {
+    "@chainlink/contracts": "^0.2.1",
+    "@openzeppelin/contracts": "^4.1.0",
+    "@openzeppelin/test-helpers": "^0.5.12",
+    "@truffle/hdwallet-provider": "^1.4.1",
+    "babel-polyfill": "6.26.0",
+    "babel-preset-env": "1.7.0",
+    "babel-preset-es2015": "6.24.1",
+    "babel-preset-stage-2": "6.24.1",
+    "babel-preset-stage-3": "6.24.1",
+    "babel-register": "6.26.0",
+    "bootstrap": "4.3.1",
+    "chai": "4.2.0",
+    "chai-as-promised": "7.1.1",
+    "chai-bignumber": "3.0.0",
+    "dotenv": "^10.0.0",
+    "react": "16.8.4",
+    "react-bootstrap": "1.0.0-beta.5",
+    "react-dom": "16.8.4",
+    "react-scripts": "^2.1.8",
+    "truffle": "^5.3.6",
+    "web3": "^1.3.6"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": [
+    ">0.2%",
+    "not dead",
+    "not ie <= 11",
+    "not op_mini all"
+  ]
+}