ARCHIVE / 2022-02-14

golang nft 原理與呼叫 & ipfs

Published 2022-02-14

Programming & Software Engineering Finance & Blockchain

golang nft

在快速上手的文章內已經有大致介紹怎麼去產生一個ntf,今天background 補一補就可以來寫一下了，在網路上找了一下都是nodejs 去呼叫，能不能用golang呼叫呢我們來看一下 https://ithelp.ithome.com.tw/articles/10269418 https://blog.aotoki.me/posts/2021/09/21/getting-started-nft/

https://blog.csdn.net/qq_37133717/article/details/80516917

https://ksin751119.medium.com/%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8-golang-%E5%91%BC%E5%8F%AB-solidity-contract-call-function-%E4%B8%8D%E6%9C%83%E7%9C%9F%E6%AD%A3%E5%9F%B7%E8%A1%8C-transaction-269648eb4a5

https://www.twblogs.net/a/5f04eaa0ca069a6e811d298f

Hardhat

經過幾年的發展區塊鏈相關的開發工具越來越成熟，我們可以直接透過 Hardhat 這個套件撰寫測試、部署智慧型合約。

code

mkdir MyNFT
yarn add -D hardhat && npx hardhat

OpenZeppelin 實作 ECR721 非常的簡單，我們先將基礎合約加入專案。

code

yarn add @openzeppelin/contracts

在部屬的方面我們使用nodejs 來部屬

deploy

code

.
├── README.md
├── artifacts
│   ├── @openzeppelin
│   ├── build-info
│   ├── contracts
│   └── hardhat
├── cache
│   └── solidity-files-cache.json
├── contracts
│   ├── Greeter.sol
│   ├── MyNFT.sol
│   ├── README.md
│   └── package.json
├── hardhat.config.js
├── package-lock.json
├── package.json
├── scripts
│   ├── deploy.js
│   ├── mint.js
│   └── sample-script.js
├── sol
│   └── output 
├── sources
│   ├── MyNFT.sol
│   ├── Store.sol
│   ├── contracts
│   ├── golangMyNFT.sol
│   └── output
├── test
│   └── sample-test.js
└── yarn.lock

OpenZeppelin gen ECR721 nodejs

code

yarn add @openzeppelin/contracts

code

pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
contract MyNFT is ERC721, Ownable {
  using Counters for Counters.Counter;
  using Strings for uint256;
  Counters.Counter private _tokenIds;
  mapping (uint256 => string) private _tokenURIs;

  constructor() ERC721("MyNFT", "MNFT") {}
  function _setTokenURI(uint256 tokenId, string memory _tokenURI)
    internal
    virtual
  {
    _tokenURIs[tokenId] = _tokenURI;
  }

  function tokenURI(uint256 tokenId)
    public
    view
    virtual
    override
    returns (string memory)
  {
    require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
    string memory _tokenURI = _tokenURIs[tokenId];
    return _tokenURI;
  }

  function mint(address recipient, string memory uri)
    public
    returns (uint256)
  {
    _tokenIds.increment();
    uint256 newItemId = _tokenIds.current();
    _mint(recipient, newItemId);
    _setTokenURI(newItemId, uri);
    return newItemId;
  }
}

gen ECR721 nodejs to golang

OpenZeppelin 因為安全因素寫了模板那麼這些模板

code

import "@openzeppelin\....

實際上就是nodejs專案里的sol 那麼我們只要移出來基本上就可以進行編譯

code

pragma solidity ^0.8.0;
import "/contracts/token/ERC721/ERC721.sol";
import "/contracts/utils/Counters.sol";
import "/contracts/access/Ownable.sol";
contract MyNFT is ERC721, Ownable {
  using Counters for Counters.Counter;
  using Strings for uint256;
  Counters.Counter private _tokenIds;
  mapping (uint256 => string) private _tokenURIs;

  constructor() ERC721("MyNFT", "MNFT") {}
  function _setTokenURI(uint256 tokenId, string memory _tokenURI)
    internal
    virtual
  {
    _tokenURIs[tokenId] = _tokenURI;
  }

  function tokenURI(uint256 tokenId)
    public
    view
    virtual
    override
    returns (string memory)
  {
    require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
    string memory _tokenURI = _tokenURIs[tokenId];
    return _tokenURI;
  }

  function mint(address recipient, string memory uri)
    public
    returns (uint256)
  {
    _tokenIds.increment();
    uint256 newItemId = _tokenIds.current();
    _mint(recipient, newItemId);
    _setTokenURI(newItemId, uri);
    return newItemId;
  }
}

照以前的編譯流程

code

 docker run -v ~/golang/nodejs/sources:/sources ethereum/solc:stable -o /sources/output --abi --bin /sources/Store.sol
 abigen --bin=MyNFT.bin --abi=MyNFT.abi --pkg=store --out=MyNFT.go

到這邊我們就得到了合約檔案

hardhat.config.js

我們先用nodejs 進行部屬

code

require("@nomiclabs/hardhat-waffle");

// This is a sample Hardhat task. To learn how to create your own go to
// https://hardhat.org/guides/create-task.html
const PRIVATE_KEY = process.env.PRIVATE_KEY;
task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
  const accounts = await hre.ethers.getSigners();

  for (const account of accounts) {
    console.log(account.address);
  }
});

// You need to export an object to set up your config
// Go to https://hardhat.org/config/ to learn more

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
module.exports = {
  solidity: "0.8.3",
  // defaultNetwork: "hardhat",
  networks: {
    matic: {
      url: "http://172.20.64.1:7545", //這邊填入我們的ganache server
      accounts: ["f34d7cf0277f16e5b3a17a6f4997447c95e15510dacaa7b584171a75c45d7a7e"],
        //accounts 填入我們的  ganache 的帳號
    },
  }
};

/script/deploy.js

包括之前的目錄架構我們還要把智能合約編成 golang 部屬合約

code

const hre = require("hardhat");

async function main() {
  const NFT = await hre.ethers.getContractFactory("MyNFT");
  const nft = await NFT.deploy();
    await nft.deployed();

    console.log("NFT deployed to:", nft.address);
}

main().then(() => process.exit(0)).catch(error => {
  console.error(error);
  process.exit(1);
});

/script/mint.js

其中 url使用的一般的網址 https://cf.shopee.tw/file/fa65fb72e2b17594b3f1f5b6dec89382_tn

code

npx hardhat run scripts/mint.js --network matic

進行發布 nft

code

const hre = require("hardhat");
require("dotenv").config();

const WALLET_ADDRESS ="0x2ae127Cc29590d09A72B40F00b9802163aB3B248"; //我們的錢包
const CONTRACT_ADDRESS = "0x66Ed606D1359468258fd60267D0D4041CDBD13f8" //我們的合約地址

async function main() {
  const NFT = await hre.ethers.getContractFactory("MyNFT");

  const URI = "https://cf.shopee.tw/file/fa65fb72e2b17594b3f1f5b6dec89382_tn" //test

    const contract = NFT.attach(CONTRACT_ADDRESS);
    await contract.mint(WALLET_ADDRESS, URI);

  console.log("NFT minted:", contract);

}

main().then(() => process.exit(0)).catch(error => {
  console.error(error);
  process.exit(1);
});

check ntf smart Contracts

https://blockcast.it/2019/10/21/mica-research-1-min-intro-of-ipfs/ 我們知道最夯的 ntf 它裡面只是把url 換成 ipfs那麼我們來看怎麼取得剛才ECR721合約裡的 url

code

func main (){
    address := common.HexToAddress("0x66Ed606D1359468258fd60267D0D4041CDBD13f8")
    instance, err := NewStore(address, client)
    if err != nil {
        log.Fatal(err)
    }
    // var number []byte
    // number = abi.U256(big.NewInt(0))
    fmt.Println("contract is loaded")
    a := big.NewInt(1)
    // CallOpts := new(bind.CallOpts)
    fmt.Println(a)

    geturl, err := instance.TokenURI(nil, a)
    if err != nil {
        log.Fatal(err)
    }
    // // _ = instance
    fmt.Println(instance)
    fmt.Println(geturl)

}

到此比較新型的區塊鏈技術應該就完成，ipfs 應該也可以自己架設，一個類似nft dapp 原理大致是這樣，其他應用就看大家的創意了，更多技術原理看這篇 for nodejs https://ithelp.ithome.com.tw/articles/10278782 它裡面包含應用的原理與實現我覺得講得很讚大致上的意思就是大家挖的礦變成其他東西給替代，類似於抽獎大家每次挖的地方都不一樣，到最後可能合約某些value 會對應到某個帳號，有看到幾篇文章就是你可以識別那些eth 是你的。 https://medium.com/7sevencoin/erc20%E5%92%8Cerc721%E4%B8%8D%E4%B8%80%E6%A8%A3%E5%9C%A8%E5%93%AA%E8%A3%A1-2e550bb0bea3

Original Blogger labels · 2

#Go #ntf

golang nft

Hardhat

OpenZeppelin 實作 ECR721 非常的簡單，我們先將基礎合約加入專案。

deploy

OpenZeppelin gen ECR721 nodejs

gen ECR721 nodejs to golang

hardhat.config.js

/script/deploy.js

/script/mint.js

check ntf smart Contracts

Comments