Deploy an EVM contract
Overview
The x/evm
Warden module allows executing Ethereum Virtual Machine (EVM) contracts charged by Evmos. They are written in Solidity.
This guide explains how to create and deploy a simple "Hello World" Solidity smart contract on the Warden chain. Since it's intended for testing purposes, you'll be running a local chain.
Prerequisites
Before you start, complete the following prerequisites:
-
Install Node.js and npm by running the following command:
brew install node
-
Install Truffle globally:
npm install -g truffle
-
Run a local chain and make sure you have
wardend
correctly installed.In Step 3, you'll need your Warden private key. You can get it by executing the command below. Specify your key name (local account name).
wardend keys export my-key-name --unarmored-hex --unsafe
tipIf you used a
just
script or a devnet snapshot to run your node, the local account name isshulgin
. You can check the names of available keys by runningwardend keys list
.
1. Create an EVM project
-
Create a new directory
/warden-smart-contract
for your project and navigate there:mkdir warden-smart-contract
cd warden-smart-contract -
Initialize a new Truffle project:
truffle init
2. Create a smart contract
In the /warden-smart-contract/contracts
directory, create a new file HelloWarden.sol
with the following contents:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract HelloWarden {
string public message;
constructor() {
message = "Hello, Warden!";
}
function setMessage(string memory newMessage) public {
message = newMessage;
}
function getMessage() public view returns (string memory) {
return message;
}
}
3. Configure Truffle
-
Install HDWalletProvider:
npm install @truffle/hdwallet-provider
-
In the
/warden-smart-contract
directory, find thetruffle-config.js
file and update it with the code below.Replace
your_private_key
with your actual private key (see Prerequisites).const HDWalletProvider = require('@truffle/hdwallet-provider');
// Your private key (keep this secret and never commit it to version control!)
const PRIVATE_KEY = 'your_private_key';
module.exports = {
networks: {
warden: {
provider: function() {
return new HDWalletProvider(PRIVATE_KEY, "http://localhost:8545");
},
network_id: 1337, // Match any network id
host: "127.0.0.1",
port: 8545,
gas: 5500000,
gasPrice: 20000000000, // 20 gwei
},
},
compilers: {
solc: {
version: "0.8.0",
}
}
};
4. Create a migration script
In /warden-smart-contract/migrations
, create a new file 2_deploy_hello_warden.js
with the following s:
const HelloWarden = artifacts.require("HelloWarden");
module.exports = function(deployer) {
deployer.deploy(HelloWarden);
};
5. Compile the contract
To compile your contract, run this command:
truffle compile
You'll see an output similar to the following:
Compiling your contracts...
===========================
> Compiling ./contracts/HelloWarden.sol
> Artifacts written to /build/contracts
> Compiled successfully using:
- solc: 0.8.0+commit.c7dfd78e.Emscripten.clang
6. Deploy the contract
To deploy the contract, run this:
truffle migrate --network warden
You should see the following output, confirming the successful deployment.
Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.
Starting migrations...
======================
> Network name: 'warden'
> Network id: 1337
> Block gas limit: 4294967295 (0xffffffff)
2_deploy_hello_warden.js
========================
Deploying 'HelloWarden'
-----------------------
> transaction hash: 0x14ed62fcb105a3b5d315738767f288101f4db2d13ee4924a217090080abe0fef
> Blocks: 0 Seconds: 0
> contract address: 0x2AAbb1a9b8EdE05f183FfD90A324ce02A349F6e5
> block number: 2993
> block timestamp: 1725617534
> account: 0x6Ea8aC1673402989e7B653aE4e83b54173719C30
> balance: 9999999.83499999999011708
> gas used: 2750000 (0x29f630)
> gas price: 20 gwei
> value sent: 0 ETH
> total cost: 0.055 ETH
> Saving artifacts
-------------------------------------
> Total cost: 0.055 ETH
Summary
=======
> Total deployments: 1
> Final cost: 0.055 ETH
7. Interact with the contract
-
Open the Truffle console:
truffle console --network warden
-
In the console, interact with your contract:
let instance = await HelloWarden.deployed()
let message = await instance.getMessage()
console.log(message) // Should print "Hello, Warden!"
await instance.setMessage("Hello, EVM on Warden!")
message = await instance.getMessage()
console.log(message) // Should print "Hello, EVM on Warden!"The console log should first print
Hello, Warden!
and thenHello, EVM on Warden!
If you encounter any issues, please reach out to us in Discord or Twitter.
Happy coding! 🚀