Section2 : Smartcontracts with solidity

34. Contract Deployment

: how do we actually deploy it?

 

contract source-solidity complier-abi | contract bytecode

 

Truffle = tool

Problems with Truffle

 

Custom Node Project

: project that's going to help us run, test and deploy our remix or Etherium contracts

36. Project Requirements

need to be 100% positive that before we deploy our contract

; deal with very real money

 

MOCA test Library

; how to interact Ethereum contracts from JS code

 

-GIT Bash terminal 내에서 진행-

1. $cd ~/inbox

2. $npm install

3. $mkdir inbox

4. $cd inbox

5. $npm init

위 단계를 모두 마무리하고 ls 를 쳐보면 inbox dir 안에 package.json 파일이 생성된 것을 확인 가능

 

37. Project File Walkthrough

 

1. Contracts dir - inbox.sol

2. test dir - inbox.test.js

사용한 editor = ATOM

Atom editor 내에서 inbox project를 열어줌

contracts folder 생성

-> 그 안에 Inbox.sol 파일 생성 - 이전에 remix editor에서 작성했던 코드를 붙여넣음

 

38. Sintax Highlights

File-Settings-Install-> language-ethereum 검색-> install

패키지  install이 완료되면 솔리디티 코드의 syntax에 하이라이트 쳐진 것을 발견 할 수 있음

39. Compiling Solidity

 

contract testing / deployment를 하기 위해서는 먼저 compile 단계를 마무리해야 함

1.  $npm install --save solc

2. compile.js file 생성

: read the contents of the file

 

compile.js

 

40-41. The Compile Script

1. node compile.js

*오류발생: AssertionError [ERR_ASSERTION]: Invalid callback object specified.

-> 해결: npm install solc@0.4.17 이후 다시 node compile.js 시도

 

module.exports = solc.compile(source, 1).contracts[':Inbox'];

-> contract에 직접 접속하는 코드

 

42.- 43. Installing Modules

1. $ npm install --save mocha ganache-cli web3

2. inbox 안에 Test folder 생성

3. Test folder 안에 Inbox.test.js 파일 생성

 

 

45. Web3 Providers

purpose of each instance = connect to a different Ethereum N/W

 

provider = communication layer between Web3 library & some specific Ethereum N/W

 

46. Testing with Mocha

Mocha= test running framework

 

Inbox.test.js

1. $npm run test

 

Inbox.test.js (2)

2. $npm run test

 

const assert = require('assert');
const ganache = require('ganache-cli');
const Web3 = require('web3'); //instance of Web3
const web3 = new Web3(ganache.provider()); //provider

class Car{
  park(){
    return 'stopped';
  }
  drive(){
    return 'vroom';
  }
}

let car;

beforeEach(()=>{
  car = new Car();
});

describe('Car', ()=>{
  it('can park', ()=>{ //test park func
    //const car = new Car();
    assert.equal(car.park(), 'stopped');
  });

  it('can drive', () => {
    //const car = new Car();
    assert.equal(car.drive(),'vroom');
  });
});

beforeEach 함수 써서 다시 작성

 

3. $npm run test

같은 결과 나옴

 

47. Mocha Structure

 

48. Fetching Accounts from Ganache

49.- 50. Deployment with Web3

 

deploy the contract <- contract's bytecode

 

calling deploy = starts to create an object -> deploy

 

 

53. Verifying the Initial Message 

 

const assert = require('assert');
const ganache = require('ganache-cli');
const Web3 = require('web3'); //instance of Web3
const web3 = new Web3(ganache.provider()); //provider

const{interface, bytecode}=require('../compile');

let accounts;
let inbox;

beforeEach(async () => {
  //Get a list of all accounts
  accounts = await web3.eth.getAccounts();
  //Use one of those accounts to ddeploy the contract

inbox = await new web3.eth.Contract(JSON.parse(interface))
  .deploy({ data: bytecode, arguments:['Hi there!']})
  .send({from: accounts[0], gas:'1000000'})

});

describe('Inbox', () => {
  it('deploys a contract' , () => {
    assert.ok(inbox.options.address);
  });

  it('has a default message', async()=> {
    const message = await inbox.methods.message().call();
    assert.equal(message, 'Hi there!')
  });
});

 

$npm run test

실행 결과

 

54. Testing Message Updates 

 

위의 코드에 setMessage method 추가

 

$npm run test

실행 결과

 

55. Deployment with Infura

Infura API

= give us the ability to get access to a node

=our connection point to the outside rink B network

 

*does not replace the need for signing up for an Ethereum account  

 

56. Infura SignUP - 58. Wallet Provider setup

 

1. infuro.io 접속

https://infura.io/ 

Ethereum API | IPFS API & Gateway | ETH Nodes as a Service

2. $ npm install @truffle/hdwallet-provider

 

deploy.js

3. 파일 생성

 

59. Deployment to Rinkeby

 

1. deploy.js 마저 작성

 

2. $ node deploy.js

 

60. Observing Deployment on Etherscan

 

medal item final aspect monitor penalty fat magic enough close action basket