Truffle

https://github.com/trufflesuite/truffle/

PreviousOpenZeppelin 合約 library Next合約部屬

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Truffle

https://github.com/trufflesuite/truffle/

如果有安裝metamask記得要換一個瀏覽器

記得先安裝

npm install -g truffle ethereumjs-testrpc

我們這邊選擇一個叫做webpack的模板

mkdir truffleTest
cd truffleTest
truffle init webpack //使用名稱為webpack的範例模板

之後會開始下載然後進入專案

之後啟動testrpc 開一個termaial然後輸入testrpc

之後進入專案路徑的terminal輸入truffle compile

然後部署到testrpc跑的測試鏈上truffle migrate

之後可以試著用頁面轉token
然後更改地40行account = accounts[0]; 的數字查看

106/05/04

npm install -g truffle

1.

新增一個資料夾cd進去，之後執行

truffle init

開啟testRPC

npm install -g ethereumjs-testrpc

之後輸入testrpc，他會預設給你九組帳號和對應私鑰

3.在contract下新增一個HelloWorld.sol

pragma solidity ^0.4.8;

contract HelloWorld {

    uint public balance;

    function HelloWorld() {
        balance = 2000;
    }

    function deposit(uint _value) {
      // ...
      balance += _value;
    }
}

把migrate資料夾下的_deploy_contracts.js改為如下

var HelloWorld = artifacts.require("./HelloWorld.sol");

module.exports = function(deployer) {
  deployer.deploy(HelloWorld);
};

之後

truffle compile  => truffle migrate  => truffle console

compile是把sol compile之後會多出json檔案，migrate是把contract部署到RPC上

查看餘額

HelloWorld.deployed().then(ins => ins.balance().then(a => console.log(a)))

存錢

HelloWorld.deployed().then(a => {a.deposit(200)})

注意事項: 1.

Truffle更改了API

...deployed()後面要用then來接

ex:

HelloWorld.deployed().then(a => console.log(a.address))

HelloWorld.deployed().then(a => console.log(a.balance().then(console.log)))

檔案sol的名稱要跟contract名稱相同

如果想更改已部署到RPC上的contract要輸入 truffle migrate --reset

使用truffle box

官方有內建幾個box，算是模板，可供下載

truffle unbox <package>

但如果搭配ethereumjs-testrpc，記得更改設定的port以及寫gasLimit，不然可能會出錯

truffle.js

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // for more about customizing your Truffle configuration!
  networks: {
    development: {
      host: "127.0.0.1",
      port: 8545,
      network_id: "*", // Match any network id
      gas: 4712388
    }
  }
};

類似圖形化的testrpc
或是僅安裝指令列
npm install ganache-cli -g

truffle-config.js 範例

const HDWalletProvider = require("truffle-hdwallet-provider");

const mnemonic = "...12 words";

module.exports = {
  networks: {
    development: {
      host: "localhost",
      port: 8545,
      network_id: "*" // Match any network id
    },
    ropsten: {
      // must be a thunk, otherwise truffle commands may hang in CI
      provider: () =>
        new HDWalletProvider(mnemonic, "https://ropsten.infura.io/v3/..."),
      network_id: '3',
    }
  }
};