Truffle: Deploying a Smart Contract

Learn how to deploy a simple Solidity-based smart contract to Uptick using the Truffle environment

Pre-requisite Readings

• Installation

• Run a node

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

If you haven't already, you will also need to install Uptick if you plan on deploying your smart contracts locally. Check this document for the full instructions.

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 uptick-truffle
cd uptick-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 Uptick local node.

Start Node

Start your local node using the following command on the Terminal

# from the ~/uptick/ directory
$ init.sh

For further information on how to run a node, please refer to the quickstart guide.

Deploy contract

In the Truffle terminal, migrate the contract using:

truffle migrate --network development

You should see incoming deployment logs in the Uptick 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 Uptick 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)