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Step-3.md

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Step 3. Deploy step: The contract will be deployed on Matic's Mumbai testnet

Now that we have our smart contract compiled and tested, it's time to deploy it! 🚀

Deploying your contracts

Next, to deploy the contract we will use a Hardhat script.

First let's change the hardhat.config.ts to use Mumbai's testnet:

TypesScript

import { HardhatUserConfig } from "hardhat/config";
import "@nomicfoundation/hardhat-toolbox";

const config: HardhatUserConfig = {
  solidity: "0.8.18",
  networks: {
    polygon_mumbai: {
      url: "https://rpc-mumbai.maticvigil.com",
      accounts: [process.env.PRIVATE_KEY || '0'.repeat(64)]
    }
  }
}

export default config;

JavaScript

require("@nomicfoundation/hardhat-toolbox");

module.exports = {
  solidity: "0.8.18",
  networks: {
    polygon_mumbai: {
      url: "https://rpc-mumbai.maticvigil.com",
      accounts: [process.env.PRIVATE_KEY || '0'.repeat(64)]
    }
  }
}

Notice the environment variable used in this configuration?

To deploy our tested smart contract we need to set PRIVATE_KEY.

Private key

We need a funded test wallet for testing, and this can be a new keypair. Follow below steps to generate one:

  1. openssl rand -hex 32 will generate a new key.
  2. Get its public key by importing to your favorite wallet
  3. Get some Mumbai MATIC send to the public key over at https://faucet.polygon.technology/

Inside the scripts/ folder you will find a file called deploy.ts which will deploy your contract.

You can run it using:

export PRIVATE_KEY=5ae4655bbd427f5fa5f57696f6dc6a90d7aa758489f884e39d1a44943104bac1
npx hardhat run scripts/deploy.ts

And you should see your program being deployed!

Lock with 0.001ETH and unlock timestamp 1681729208 deployed to 0xC279D9967FA0D3F9794a7CAa10B97a8Df35BA973

Automate your pipeline

Let's automate this final step in our CI platform.

jobs:
  - name: deploy
    secrets:
      - PRIVATE_KEY
    commands:
      - npx hardhat run scripts/deploy.ts --network polygon_mumbai
    resources:
      - name: node_modules
      - name: artifacts
      - name: cache

NOTE: The PRIVATE_KEY has to be added securely in the CI platform, and not put in code. Go to https://app.nosana.io and input the test private key generated above as a secret named PRIVATE_KEY.

When that is done everything should run automatically and each commit will deploy your contract to testnet.

Bonus points

Add Polygonscan API key to verify the contract on Polygonscan. You can generate an API key by creating an account.

Add something like the below to your hardhat configuration file, and don't forget to add the POLYGONSCAN_API_KEY secret in the CI app.

etherscan: {
  apiKey: process.env.POLYGONSCAN_API_KEY
}