DEX

A simple Decentralized Exchange that allows users to BUY/SELL ERC20 tokens in exchange of ETH.

Prerequisites

To run this project you need to have Truffle installed on your machine. I've intergrated this project by using latest version of truffle and nodejs. In this project I'm using openZeppelin, a open source solidity library for secure development.

For installation of openZeppelin use the following command in your terminal -

$ npm install @openzeppelin/contracts

To assert the statements in test cases, I'm using a library called truffle assertions.To install it, use the below command in your terminal -

$ npm install truffle-assertions

Overview

Before going into technical details, let's consider the scenario when we go to market to buy goods. We usually follow two approaches. One we buy/sell goods at available prices and the other we try to bargain. Here I'm following similar kinda approches for exchange of ERC20 tokens. Have a look at the code to understand the technical details.

To have a look at Dapp for the same, please click Dapp for DEX

Project Setup

After the initial setup of truffle, open Visual Studio IDE to run the project. Open your working directory and then open your bash terminal to run initial commands -

$ npm init
$ truffle init
$ git clone https://github.com/tagupta/DEX.git

Now open your command prompt terminal to run the below commands in the working directory

truffle compile 
truffle develop
migrate

Then create contract instances to proceed.To run the test cases, use the following command in your terminal -

truffle test

Enjoy

Play around with the code.