How to Deploy Smart Contracts via Relayer | by Stephen Lloyd Webber | Jul, 2022

With out exposing non-public keys

Photograph by Olav Ahrens Røtne on Unsplash

Right here’s easy methods to deploy good contracts with out the chance of exposing a non-public key through the use of OpenZeppelin Defender’s Relayer API.

Copy Your Defender Workforce API Key and Secret

From Defender, choose the hamburger menu on the prime proper after which Workforce API Keys. Right here you will note any present API keys in addition to what may be finished with them. From this dashboard you too can delete API keys by hovering over it and deciding on the trash can from the precise.

Choose Create Workforce API Key, then depart the whole lot checked until you want to limit the rights of what may be carried out utilizing this API key. Hit Save. You can be prompted to repeat the API key and secret. Retailer these in a safe location. They won’t be displayed once more.

Choose the checkmark to point that you’ve got copied the keys, and choose Save.

Copy your crew API key and secret from Defender.

Create A Relayer

First, set up the required bundle:

$ npm set up defender-relay-client

Create a script similar to the next, supplying your Defender API key and secret in your .env file and adjusting variable names as acceptable.

const  RelayClient  = require(‘defender-relay-client’);
const appendFileSync, writeFileSync = require(‘fs’);
async operate run()
const DEFENDER_API_KEY: apiKey, DEFENDER_API_SECRET: apiSecret = course of.env;
const relayClient = new RelayClient( apiKey, apiSecret );
// create relay utilizing defender consumer
const requestParams =
title: ‘MyRelayer’,
community: ‘goerli’,
minBalance: BigInt(1e17).toString(),
const relayer = await relayClient.create(requestParams);

// retailer relayer data in file (non-obligatory)
writeFileSync(‘relay.json’, JSON.stringify(
, null, 2));
console.log(‘Relayer ID: ‘, relayer);

// create and save the api key to .env — wanted for sending tx
const apiKey: relayerKey, secretKey: relayerSecret = await relayClient.createKey(relayer.relayerId);
appendFileSync(‘.env’, `nRELAYER_KEY=$relayerKeynRELAYER_SECRET=$relayerSecret`);
run().catch((error) =>
course of.exitCode = 1;

Notice: To ship a transaction straight through the Relayer utilizing the API, you want the important thing and secret (which have been appended within the above code to your .env file).

If, nevertheless, you want to ship a transaction by means of an Autotask, the one credentials you want are the crew API key and secret together with the relayerId (which within the above step was saved to the relay.json file).

Compile and Deploy the Contract

Run npx hardhat compile (or the equal if utilizing a unique compiler) to get your good contract prepared for deployment.

Use the next script to deploy the contract:

const  DefenderRelayProvider, DefenderRelaySigner  = require(‘defender-relay-client/lib/ethers’);
const ethers = require(‘hardhat’);
const writeFileSync = require(‘fs’);
async operate predominant()
const credentials = apiKey: course of.env.RELAYER_KEY, apiSecret: course of.env.RELAYER_SECRET;
const supplier = new DefenderRelayProvider(credentials);
const relaySigner = new DefenderRelaySigner(credentials, supplier, pace: ‘quick’ );

const MyContract = await ethers.getContractFactory(“SimpleRegistry”);
const myContract = await MyContract.join(relaySigner).deploy().then(f => f.deployed());

writeFileSync(‘deploy.json’, JSON.stringify(
MyContract: myContract.handle,
, null, 2));
console.log(`MyContract: $myContract.addressn`);
if (require.predominant === module)
predominant().then(() => course of.exit(0))
.catch(error => console.error(error); course of.exit(1); );

This code pulls the Relayer’s credentials from the native file together with the artifacts for the contract and makes use of ethers.js to deploy. The related handle of the contract is saved to the native file deploy.json.

Congratulations on efficiently deploying your contract through Relayer!

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