Mushroomy's 9th Blockcahin Story

blockchain

Truffle Command

1. 설치 및 버전 확인: 아래의 버전내용이 뜨지 않으면 npm i -g truffle로 설치하자.

test $ truffle --version

Truffle v4.1.14 (core: 4.1.14)
Solidity v0.4.24 (solc-js)


2. 트러플 프로젝트 초기화 과정

test $ truffle init

Downloading...
Unpacking...
Setting up...
Unbox successful. Sweet!

Commands:

Compile:        truffle compile
Migrate:        truffle migrate
Test contracts: truffle test

test $ ls -al

drwxr-xr-x  7 test  staff   224B Oct 25 19:54 .
drwxr-xr-x  4 test  staff   128B Oct 25 19:31 ..
drwxr-xr-x  3 test  staff    96B Oct 25 19:54 build
drwxr-xr-x  4 test  staff   128B Oct 25 19:54 contracts
drwxr-xr-x  4 test  staff   128B Oct 25 19:44 migrations
drwxr-xr-x  2 test  staff    64B Oct 25 19:31 test
-rw-r--r--  1 test  staff   545B Oct 25 19:31 truffle-config.js
-rw-r--r--  1 test  staff   545B Oct 25 19:31 truffle.js


3. 스마트 컨트랙트 생성

test $ cd contracts
contracts $ vi MyName.sol

pragma solidity ^0.4.24;

contract MyName {
    string myName = "JongKwang Coin";

    function getMyName() constant public returns(string) {
        return myName;
    }

    function setMyName(string newMyName) public {
        myName = newMyName;
    }
}
~
~
~
~
:wq

contracts $ ls -al

drwxr-xr-x  4 test  staff  128 Oct 25 19:54 .
drwxr-xr-x  7 test  staff  224 Oct 25 20:05 ..
-rw-r--r--  1 test  staff  507 Oct 25 19:31 Migrations.sol
-rw-r--r--  1 test  staff  244 Oct 25 19:54 MyName.sol


4. 마이그레이션 파일 생성 (for deploying)

test $ cd migrations
migrations $ vi 2_deploy_myname.js

var myName = artifacts.require("./MyName.sol");
module.exports = function(deployer) {
        deployer.deploy(myName);
};
~
~
~
~
~
:wq

migrations $ ls -al

drwxr-xr-x  4 test  staff  128 Oct 25 20:09 .
drwxr-xr-x  7 test  staff  224 Oct 25 20:05 ..
-rw-r--r--  1 test  staff  129 Oct 25 19:31 1_initial_migration.js
-rw-r--r--  1 test  staff  116 Oct 25 19:44 2_deploy_myname.js



5. 개발환경 구성

test $ truffle develop

Truffle Develop started at http://127.0.0.1:9545/

Accounts:
{10개 생성됨}

Private Keys:
{10개 생성됨}

Mnemonic: candy maple cake sugar pudding cream honey rich smooth crumble sweet treat

⚠️  Important ⚠️  : This mnemonic was created for you by Truffle. It is not secure.
Ensure you do not use it on production blockchains, or else you risk losing funds.

truffle(develop)>
truffle(develop)>


6. 배포 (한 번만 하면 됨)

truffle(develop)> migrate

Compiling ./contracts/Migrations.sol...
Compiling ./contracts/MyName.sol...
Writing artifacts to ./build/contracts

Using network 'develop'.

Running migration: 1_initial_migration.js
  Deploying Migrations...
  ... {hash}
  Migrations: {hash}
Saving successful migration to network...
  ... {hash}
Saving artifacts...
Running migration: 2_deploy_myname.js
  Deploying MyName...
  ... {hash}
  MyName: {hash}
Saving successful migration to network...
  ... {hash}
Saving artifacts...


Truffle (with Web3 API)

ttruffle(develop)> web3.eth

Eth {
  _requestManager:
   RequestManager {
     provider:
      HttpProvider {
        host: 'http://127.0.0.1:9545/',
        timeout: 0,
        user: undefined,
        password: undefined,
        headers: undefined,
        send: [Function],
        sendAsync: [Function],
        _alreadyWrapped: true },
     polls: {},
     timeout: null },
  getBalance:

  ... (생략)...



1. MyName.deployed().then(function(instance) { app = nstance; })
2. web3.fromWei(web3.eth.getBalance(web3.eth.accounts[1]), "ether")
3. app.setMyName("Han", {from: web3.eth.accounts[1]})
4. app.getMyName()


Ganache

ganache



1. truffle-config.js: ganache에 트러플 연결

module.exports = {
  networks: {
    development: {
      host: "127.0.0.1",
      port: 8545,
      network_id: "*" // Match any network id
    }
  }
};


2. command

truffle  console  --network development
migrate  --compile-all  —reset

-> 1개 블록에 1개의 트랜잭션만 담는다.


Truffle pet shop