This is the forth project for @Udemy Blockchain developer Nanodegree. The purpose of this project is to create a smart contract, an Oracle and the dapp that demonstrates an Airline registration and insurance payout to passenger in case of an airline delay. The project started with boilerplate code. Smart Contract code is separated into multiple contracts:
1) FlightSuretyData.sol for data persistence
2) FlightSuretyApp.sol for app logic and oracles code
DAPP client have the functionalities of:
1) Create an Airline
Createria to create Airline:
-First airline is registered when contract is deployed.
-Only existing airline may register a new airline until there are at least four airlines registered
-Registration of fifth and subsequent airlines requires multi-party consensus of 50% of registered airlines
-Airline can be registered, but does not participate in contract until it submits funding of 10 ether
2) Create a flight
3) Passenger can buy an insurance for the flight
4) Trigger Smart Contract to send random flight status
A server app has been created for simulating oracle behavior. Upon start up, 20+ oracles are registered and their assigned indexes are persisted in memory. Upon Smart Contract request a flight status update by emmiting an event if the oracle have the index of the flight that Smart Contract requested, it will send one of the following flight status at random:
1)Unknown (0)
2)On Time (10)
3)Late Airline (20)
4)Late Weather (30)
5)Late Technical (40)
6)Late Other (50)
- Solidity version ^0.5.16
- Truffle version v5.1.20
- truffle-hdwallet-provider version ^1.0.0-web3one.5
- npm version 6.4.1
- ganache
First deploy the smart contract to local Ganache blockchain:
npm install
truffle compile
truffle migrate --network development --reset
Deploy server app that simulates oracles:
npm run server
An image like below is the expected outcome:
At a separate terminal start the dapp:
npm run dapp
To run the unit test run the following command:
truffle test
You can run them and separate:
truffle test ./test/flightSurety.js
truffle test ./test/oracles.js
The expected outcome :
To view dapp:
http://localhost:8000
When you send a request for oracle flight status update the response will be logged in the terminal where you runned the server and will be something like the following image:
