Fabric 2.2添加身份至FileSystemWallet时遇构造函数错误求助

错误信息 #

Error adding to wallet. TypeError: FileSystemWallet is not a constructor
TypeError: FileSystemWallet is not a constructor
    at Object.main [as execute] (/home/sujan/hyperledger/fabric-samples/application/1_addToWallet.js:14:20)
    at /home/sujan/hyperledger/fabric-samples/application/index.js:25:14
    at Layer.handle [as handle_request] (/home/sujan/hyperledger/fabric-samples/application/node_modules/express/lib/router/layer.js:95:5)
    at next (/home/sujan/hyperledger/fabric-samples/application/node_modules/express/lib/router/route.js:144:13)
    at Route.dispatch (/home/sujan/hyperledger/fabric-samples/application/node_modules/express/lib/router/route.js:114:3)
    at Layer.handle [as handle_request] (/home/sujan/hyperledger/fabric-samples/application/node_modules/express/lib/router/layer.js:95:5)
    at /home/sujan/hyperledger/fabric-samples/application/node_modules/express/lib/router/index.js:284:15
    at Function.process_params (/home/sujan/hyperledger/fabric-samples/application/node_modules/express/lib/router/index.js:346:12)
    at next (/home/sujan/hyperledger/fabric-samples/application/node_modules/express/lib/router/index.js:280:10)
    at /home/sujan/hyperledger/fabric-samples/application/node_modules/body-parser/lib/read.js:137:5

环境与相关代码 #

使用Hyperledger Fabric 2.2版本，身份添加代码如下：

'use strict';

/**
 * This is a Node.JS module to load a user's Identity to his wallet.
 * This Identity will be used to sign transactions initiated by this user.
*/

const fs = require('fs'); // FileSystem Library
const { FileSystemWallet, X509WalletMixin } = require('fabric-network'); // Wallet Library provided by Fabric

async function main(certificatePath, privateKeyPath) {
  try {
    // A wallet is a filesystem path that stores a collection of Identities
    const wallet = new FileSystemWallet(`./identity/org1`);
    const certificate = fs.readFileSync(certificatePath).toString();
    const privatekey = fs.readFileSync(privateKeyPath).toString();

    // Load credentials into wallet
    const identityLabel = `org1_admin`;
    const identity = X509WalletMixin.createIdentity(`org1MSP`, certificate, privatekey);

    await wallet.import(identityLabel, identity);
  } catch (error) {
    console.log(`Error adding to wallet. ${error}`);
    console.log(error.stack);
    throw new Error(error);
  }
}

module.exports.execute = main;

项目package.json内容：

{
    "name": "test",
    "version": "1.0.0",
    "description": "NodeJS Application Accessing The testnet chaincode on Fabric Network",
    "main": "index.js",
    "scripts": {
      "test": "rm -rf identity && node index.js"
    },
    "author": "sujan",
    "dependencies": {
      "cors": "^2.8.5",
      "express": "^4.18.2",
      "expressjs": "^1.0.1",
      "fabric-client": "~1.4.4",
      "fabric-network": "^2.2.0",
      "js-yaml": "^3.12.0",
      "pug": "^3.0.2"
    },
    "devDependencies": {
      "eslint": "^5.6.0"
    },
    "license": "ISC"
  }

解决方案 #

原因分析 #

Hyperledger Fabric 2.x版本的fabric-network库废弃了旧的FileSystemWallet和X509WalletMixin API，改用全新的钱包接口；同时项目混用1.4.x版本的fabric-client与2.2版本的fabric-network，存在版本冲突问题。

修改步骤 #

1. 更新身份添加代码，适配Fabric 2.x新API：

'use strict';

const fs = require('fs');
const { Wallets, X509Identity } = require('fabric-network');

async function main(certificatePath, privateKeyPath) {
  try {
    // 实例化文件系统钱包（2.x版本需异步调用）
    const wallet = await Wallets.newFileSystemWallet(`./identity/org1`);
    
    const certificate = fs.readFileSync(certificatePath).toString();
    const privateKey = fs.readFileSync(privateKeyPath).toString();

    const identityLabel = `org1_admin`;
    // 按2.x格式构造X.509身份
    const identity = {
      credentials: {
        certificate: certificate,
        privateKey: privateKey,
      },
      mspId: 'org1MSP',
      type: 'X.509',
    };

    // 将身份存入钱包（使用put方法替代原import）
    await wallet.put(identityLabel, identity);
    console.log(`身份 ${identityLabel} 已成功导入钱包`);
  } catch (error) {
    console.log(`添加到钱包时出错: ${error}`);
    console.log(error.stack);
    throw new Error(error);
  }
}

module.exports.execute = main;

2. 清理package.json依赖，移除过时的fabric-client避免版本冲突：
   修改后的dependencies部分：

"dependencies": {
  "cors": "^2.8.5",
  "express": "^4.18.2",
  "fabric-network": "^2.2.0",
  "js-yaml": "^3.12.0",
  "pug": "^3.0.2"
}

（注：expressjs为冗余依赖，也可一并移除）

3. 重新安装依赖：

npm install

内容的提问来源于stack exchange，提问作者sujan