Sun-Jc / EtherLend

EtherLend

This repository contains a demo DApp that simulates meetings of Rotating Credit And Savings Association (ROSCA). The technologies used include:

• Solidity
• Truffle
• Testrpc
• Node.js (with Express)
• Android

Installation

• install nodejs: sudo apt install nodejs
• install npm: sudo apt install npm
• install testrpc: npm install -g ethereumjs-testrpc
• install express: npm install express

Usage

To make the whole process run normally, the following steps need to be taken:

• Run a Testrpc Client
• Deploy the Contracts
• Run a Node.js Server
• Run a Android Client

Run Testrpc Client

testrpc

Now we have a brand new private chain Ehtereum client listening at default localhost:8545.

Deploy the Contracts

You can config the Ethereum client in truffle.js like

rpc: {
	host: "localhost",
	port: 8545
}

Then just simple deploy:

cd truffle && rm -r build && truffle migrate

Now the compiled smart contracts are already deployed onto the blockchain.

Run Node.js Server

In server.js, you can config the client port number

var provider = 'http://localhost:8545'

Also remember to set the server port number like

const PORT=8085; 

Then simply run:

cd server && node server.js

We will have a Node.js server listening at localhost:8085.

Run the Android app

Set the Node.js server url in EtherLendAndroid\app\src\main\java\edu\tsinghua\iiis\AccountModel.java:

public String BASEURL = "http://taoli.tsinghuax.org:8085/";

After a apk is compiled, you can just install that on your Android phone.

Then take a look at the tutorial video and have fun.