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Remix: Deploying a Smart Contract #

Learn how to deploy a simple Solidity-based smart contract to ICPlaza using the Remix in-browser IDE {synopsis}

Remix is an in-browser IDE for Solidity smart contracts. In this guide, we will learn how to deploy a contract to a running ICPlaza network through Remix and interact with it.

Connect to Remix #

::: tip If you haven’t already, follow the steps in the Metamask guide to import your ICPlaza private key into Metamask. Start the ICPlaza daemon and REST server. :::

Go to Remix. There are some contracts in the File Explorer. Replace these with the source code to Counter.sol below. On the left-most bar, select the Solidity Compiler and compile the contract.

pragma solidity >=0.7.0 <0.9.0;

contract Counter {
  uint256 counter = 0;

  function add() public {
    counter++;
  }

  function subtract() public {
    counter--;
  }

  function getCounter() public view returns (uint256) {
    return counter;
  }
}

Next, select the Deploy and Run option. Select Injected Web3 as the Environment. This will open a metamask popup for you to connect your Metamask to Remix. Select Connect to confirm.

You should see your account show up in the left-hand panel.

Deploy and Interact #

Now that your account is connected, you are able to deploy the contract. Press the Deploy button. A metamask pop-up will appear asking you to confirm. Confirm the transaction. You should see a log for the deployment transaction in the ICPlaza daemon logs:

I[2020-07-15|17:26:43.155] Added good transaction                       module=mempool tx=877A8E6600FA27EC2B2362719274314977B243671DC4E5F8796ED97FFC0CBE42 res="&{CheckTx:log:\"[]\" gas_wanted:121193 }" height=31 total=1

Once the contract has been successfully deployed, you will see it show up in the Deployed Contracts section in the left-hand side, as well as a green check in the Remix console showing the transaction details.

Now, you are able to interact with the contract through Remix. For Counter.sol, click add. This will open a Metamask pop-up asking you to confirm. Confirm the transaction. Then, click getCounter to get the count, which should be 1.

Hardhat: Deploying a Smart Contract #

Learn how to deploy a simple Solidity-based smart contract to ICPlaza using the Hardhat environment {synopsis}

Hardhat is a flexible development environment for building Ethereum-based smart contracts. It is designed with integrations and extensibility in mind

Install Dependencies #

Before proceeding, you need to install Node.js (we’ll use v16.x) and the npm package manager. You can download directly from Node.js or in your terminal:

:::: tabs ::: tab Ubuntu

curl -sL https://deb.nodesource.com/setup_16.x | sudo -E bash -

sudo apt install -y nodejs

::: ::: tab MacOS

# You can use homebrew (https://docs.brew.sh/Installation)
$ brew install node

# Or you can use nvm (https://github.com/nvm-sh/nvm)
$ nvm install node

::: ::::

You can verify that everything is installed correctly by querying the version for each package:

$ node -v
...

$ npm -v
...

Create Hardhat Project #

To create a new project, navigate to your project directory and run:

$ npx hardhat

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888    888                      888 888               888
888    888                      888 888               888
8888888888  8888b.  888d888 .d88888 88888b.   8888b.  888888
888    888     "88b 888P"  d88" 888 888 "88b     "88b 888
888    888 .d888888 888    888  888 888  888 .d888888 888
888    888 888  888 888    Y88b 888 888  888 888  888 Y88b.
888    888 "Y888888 888     "Y88888 888  888 "Y888888  "Y888

👷 Welcome to Hardhat v2.9.3 👷‍

? What do you want to do? …
  Create a basic sample project
❯ Create an advanced sample project
  Create an advanced sample project that uses TypeScript
  Create an empty hardhat.config.js
  Quit

Following the prompts should create a new project structure in your directory. Consult the Hardhat config page for a list of configuration options to specify in hardhat.config.js. Most importantly, you should set the defaultNetwork entry to point to your desired JSON-RPC network:

:::: tabs ::: tab Local Node

module.exports = {
  defaultNetwork: "local",
  networks: {
    hardhat: {
    },
    local: {
      url: "http://localhost:8545/",
      accounts: [privateKey1, privateKey2, ...]
    }
  },
  ...
}

::: ::: tab Testnet

module.exports = {
  defaultNetwork: "testnet",
  networks: {
    hardhat: {
    },
    testnet: {
      url: "https://eth.bd.ICPlaza.dev:8545",
      accounts: [privateKey1, privateKey2, ...]
    }
  },
  ...
}

::: ::::

To ensure you are targeting the correct network, you can query for a list of accounts available to you from your default network provider:

$ npx hardhat accounts
0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266
0x70997970C51812dc3A010C7d01b50e0d17dc79C8
0x3C44CdDdB6a900fa2b585dd299e03d12FA4293BC
0x90F79bf6EB2c4f870365E785982E1f101E93b906
...

Deploying a Smart Contract #

You will see that a default smart contract, written in Solidity, has already been provided under contracts/Greeter.sol:

pragma solidity ^0.8.0;

import "hardhat/console.sol";

contract Greeter {
    string private greeting;

    constructor(string memory _greeting) {
        console.log("Deploying a Greeter with greeting:", _greeting);
        greeting = _greeting;
    }

    function greet() public view returns (string memory) {
        return greeting;
    }

    function setGreeting(string memory _greeting) public {
        console.log("Changing greeting from '%s' to '%s'", greeting, _greeting);
        greeting = _greeting;
    }
}

This contract allows you to set and query a string greeting. Hardhat also provides a script to deploy smart contracts to a target network; this can be invoked via the following command, targeting your default network:

npx hardhat run scripts/deploy.js

Hardhat also lets you manually specify a target network via the --network <your-network> flag:

:::: tabs ::: tab Local Node

npx hardhat run --network {{ $themeConfig.project.rpc_url_local }} scripts/deploy.js

::: ::: tab Testnet

npx hardhat run --network {{ $themeConfig.project.rpc_url_testnet }} scripts/deploy.js

::: ::::

Finally, try running a Hardhat test:

$ npx hardhat test
Compiling 1 file with 0.8.4
Compilation finished successfully


  Greeter
Deploying a Greeter with greeting: Hello, world!
Changing greeting from 'Hello, world!' to 'Hola, mundo!'
    ✓ Should return the new greeting once it's changed (803ms)


  1 passing (805ms)

Truffle: Deploying a Smart Contract #

Learn how to deploy a simple Solidity-based smart contract to ICPlaza using the Truffle environment {synopsis}

Truffle is a development framework for deploying and managing Solidity smart contracts.

Install Dependencies #

First, install the latest Truffle version on your machine globally.

yarn install truffle -g

Create Truffle Project #

In this step we will create a simple counter contract. Feel free to skip this step if you already have your own compiled contract.

Create a new directory to host the contracts and initialize it:

mkdir ICPlaza-truffle
cd ICPlaza-truffle

Initialize the Truffle suite with:

truffle init

Create contracts/Counter.sol containing the following contract:

pragma solidity >=0.7.0 <0.9.0;

contract Counter {
  uint256 counter = 0;

  function add() public {
    counter++;
  }

  function subtract() public {
    counter--;
  }

  function getCounter() public view returns (uint256) {
    return counter;
  }
}

Compile the contract using the compile command:

truffle compile

Create test/counter_test.js containing the following tests in Javascript using Mocha:

const Counter = artifacts.require("Counter")

contract('Counter', accounts => {
  const from = accounts[0]
  let counter

  before(async() => {
    counter = await Counter.new()
  })

  it('should add', async() => {
    await counter.add()
    let count = await counter.getCounter()
    assert(count == 1, `count was ${count}`)
  })
})

Truffle configuration #

Open truffle-config.js and uncomment the development section in networks:

    development: {
      host: "127.0.0.1",     // Localhost (default: none)
      port: 8545,            // Standard Ethereum port (default: none)
      network_id: "*",       // Any network (default: none)
    },

This will allow your contract to connect to your ICPlaza local node.

Deploy contract #

In the Truffle terminal, migrate the contract using:

truffle migrate --network development

You should see incoming deployment logs in the ICPlaza daemon Terminal tab for each transaction (one to deploy Migrations.sol and the other to deploy Counter.sol).

$ I[2020-07-15|17:35:59.934] Added good transaction                       module=mempool tx=22245B935689918D332F58E82690F02073F0453D54D5944B6D64AAF1F21974E2 res="&{CheckTx:log:\"[]\" gas_wanted:6721975 }" height=3 total=1
I[2020-07-15|17:36:02.065] Executed block                               module=state height=4 validTxs=1 invalidTxs=0
I[2020-07-15|17:36:02.068] Committed state                              module=state height=4 txs=1 appHash=76BA85365F10A59FE24ADCA87544191C2D72B9FB5630466C5B71E878F9C0A111
I[2020-07-15|17:36:02.981] Added good transaction                       module=mempool tx=84516B4588CBB21E6D562A6A295F1F8876076A0CFF2EF1B0EC670AD8D8BB5425 res="&{CheckTx:log:\"[]\" gas_wanted:6721975 }" height=4 total=1

Run Truffle tests #

Now, you can run the Truffle tests using the ICPlaza node using the test command:

$ truffle test --network development

Using network 'development'.


Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.



  Contract: Counter
    ✓ should add (5036ms)


  1 passing (10s)

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