FreeBSD ✖️ truffle でブロックチェーン演習

目標

仮想マシン（FreeBSD）で truffle を使って ERC20 トークンを作成するコードを用意します。それを、ホストマシンで動いている Ganache にデプロイします。

手順

まずは、truffle を使えるか試してみる。

[root@vitothon /usr/local/etc]# pkg search npm
npm-8.13.0                     Node package manager
npm-node14-8.13.0              Node package manager
npm-node16-8.13.0              Node package manager
npm-node18-8.13.0              Node package manager
[root@vitothon /usr/local/etc]# pkg install npm-node16-8.13.0
[root@vitothon /usr/local/etc]# npm -v
8.13.0
[root@vitothon /usr/local/etc]# node -v
v16.15.1
[root@vitothon /usr/local/etc]# npm install -g npm@8.14.0
[root@vitothon /usr/local/etc]# npm search truffle
NAME                      | DESCRIPTION          | AUTHOR          | DATE       | VERSION  | KEYWORDS
truffle                   | Truffle - Simple…    | =sukanyaparash… | 2022-07-15 | 5.5.22   |
...
[root@vitothon /usr/local/etc]# npm install -g truffle
[root@vitothon /home/shuma]# mkdir Fikacoin
[root@vitothon /home/shuma]# cd Fikacoin/
[root@vitothon /home/shuma/Fikacoin]# truffle init
[root@vitothon /home/shuma/Fikacoin]# ls
contracts		migrations		test			truffle-config.js
[root@vitothon /home/shuma/Fikacoin]# npm init -f
[root@vitothon /home/shuma/Fikacoin]# npm install zeppelin-solidity --save

サンプルトークン contracts/Fikacoin.sol 作る。

pragma solidity ^0.8.4;
import "zeppelin-solidity/contracts/token/ERC20/StandardToken.sol";

contract Fikacoin is StandardToken {
  string public name = "Fikacoin";
  string public symbol = "FKC";
  uint public decimals = 18;

  function Fikacoin(uint initialSupply) public {
    totalSupply_ = initialSupply;
    balances[msg.sender] = initialSupply;
  }
}

コンパイルしてみる。

[root@vitothon /home/shuma/Fikacoin]# truffle compile

Compiling your contracts...
===========================
✓ Fetching solc version list from solc-bin. Attempt #1
✓ Downloading compiler. Attempt #1.
> Compiling ./contracts/Fikacoin.sol
> Compiling ./contracts/Migrations.sol
> Compiling zeppelin-solidity/contracts/token/ERC20/StandardToken.sol

> Compilation warnings encountered:

    Warning: SPDX license identifier not provided in source file. Before publishing, consider adding a comment containing "SPDX-License-Identifier: <SPDX-License>" to each source file. Use "SPDX-License-Identifier: UNLICENSED" for non-open-source code. Please see <https://spdx.org> for more information.
--> project:/contracts/Fikacoin.sol

CompileError: ParserError: Source file requires different compiler version (current compiler is 0.8.15+commit.e14f2714.Emscripten.clang) - note that nightly builds are considered to be strictly less than the released version
 --> zeppelin-solidity/contracts/token/ERC20/StandardToken.sol:1:1:
  |
1 | pragma solidity ^0.4.24;
  | ^^^^^^^^^^^^^^^^^^^^^^^^

Error: Truffle is currently using solc 0.8.15, but one or more of your contracts specify "pragma solidity ^0.4.24".
Please update your truffle config or pragma statement(s).
(See <https://trufflesuite.com/docs/truffle/reference/configuration#compiler-configuration> for information on
configuring Truffle to use a specific solc compiler version.)

Compilation failed. See above.
    at /usr/local/lib/node_modules/truffle/build/webpack:/packages/compile-solidity/dist/run.js:64:1
    at Generator.next (<anonymous>)
    at fulfilled (/usr/local/lib/node_modules/truffle/build/webpack:/packages/compile-solidity/dist/run.js:4:43)
Truffle v5.5.22 (core: 5.5.22)
Node v16.15.1

バージョンの違いで、コンパイルに失敗する。zeppelin-solidity が使えないかも。代わりに @openzeppelin/contracts を使ってみる。

[root@vitothon /home/shuma/Fikacoin]# npm install @openzeppelin/contracts --save

contracts/Fikacoin.sol を以下のように修正。

pragma solidity ^0.8.4;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract Fikacoin is ERC20 {
  constructor(uint256 initialSupply) ERC20("Fikacoin", "FKC") {
    _mint(msg.sender, initialSupply);
  }
}

もう一度コンパイルしてみる。

[root@vitothon /home/shuma/Fikacoin]# truffle compile

Compiling your contracts...
===========================
> Compiling ./contracts/Fikacoin.sol
> Compiling ./contracts/Migrations.sol
> Compiling @openzeppelin/contracts/token/ERC20/ERC20.sol
> Compiling @openzeppelin/contracts/token/ERC20/IERC20.sol
> Compiling @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol
> Compiling @openzeppelin/contracts/utils/Context.sol
> Compilation warnings encountered:

    Warning: SPDX license identifier not provided in source file. Before publishing, consider adding a comment containing "SPDX-License-Identifier: <SPDX-License>" to each source file. Use "SPDX-License-Identifier: UNLICENSED" for non-open-source code. Please see <https://spdx.org> for more information.
--> project:/contracts/Fikacoin.sol

> Artifacts written to /usr/home/shuma/Fikacoin/build/contracts
> Compiled successfully using:
   - solc: 0.8.15+commit.e14f2714.Emscripten.clang

成功した。次にマイグレーションファイル migrations/2_deploy_myToken.js を作成する。

const Fikacoin = artifacts.require('./Fikacoin.sol')

module.exports = (deployer) => {
  const initialSupply = 100000000
  deployer.deploy(Fikacoin, initialSupply)
}

とりあえず、ホストマシンの Ganache で確認するために truffle-config.js を修正する。

# ホストマシンでネットワーク状況を確認
user$ ifconfig
...
vboxnet0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
	ether 0a:00:27:00:00:00 
	inet 192.168.56.1 netmask 0xffffff00 broadcast 192.168.56.255

# FreeBSD の truffle-config.js を修正する
networks: {
  development: {
  host: "192.168.56.1",     // Localhost (default: none)
  port: 8545,            // Standard Ethereum port (default: none)
  network_id: "*",       // Any network (default: none)
  },
}

ホストマシンの Ganache のワークスペースは以下のように設定。

deploy してみる。

[root@vitothon /home/shuma/Fikacoin]# truffle deploy
This version of µWS is not compatible with your Node.js build:

Error: Cannot find module './uws_freebsd_x64_93.node'
Falling back to a NodeJS implementation; performance may be degraded.

Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.

Starting migrations...
======================
> Network name:    'development'
> Network id:      5777
> Block gas limit: 67219750000 (0xfa69bfc70)

2_deploy_myToken.js
===================

   Deploying 'Fikacoin'
   --------------------
   > transaction hash:    0x8aa71197246a8072b3ea0aecf245209fea5c4e2850c175380601b1bfbd3cf8e8
   > Blocks: 0            Seconds: 0
   > contract address:    0x13476AD53e77909F0059890bBF13E1D4fe880105
   > block number:        3
   > block timestamp:     1658060225
   > account:             0x1c064ff51B520343c99be874279795306fBd4684
   > balance:             99.97060556
   > gas used:            1178355 (0x11faf3)
   > gas price:           20 gwei
   > value sent:          0 ETH
   > total cost:          0.0235671 ETH

   > Saving migration to chain.
   > Saving artifacts
   -------------------------------------
   > Total cost:           0.0235671 ETH

Summary
=======
> Total deployments:   1
> Final cost:          0.0235671 ETH

成功！

次回

FreeBSD の jails でそれぞれブロックチェーンのノードを動かして、プライベートチェーンを動かす。