node.js - Hyperledger fabric : Error: chaincode argument error: json: cannot unmarshal array into Go struct field strArgs. 字符串类型的参数

Question

我正在尝试使用 Hyperledger 结构创建一个简单的数据库表。该表有 3 个字段，ID、姓名和出生日期。姓名和出生日期是字符串。我正在使用基本网络示例。这是我的链码:

const shim = require('fabric-shim');
const util = require('util');

var Chaincode = class {

  // Initialize the chaincode
  async Init(stub) {
    console.info('========= example02 Init =========');
    console.log("HELLO WORLD!!!");
    console.log("Init: Does nothing!");
    return shim.success();
  }

  async Invoke(stub) {
    let ret = stub.getFunctionAndParameters();
    console.info("Truong: async Invoke!!");
    console.info(ret);
    let method = this[ret.fcn];
    if (!method) {
      console.log('no method of name:' + ret.fcn + ' found');
      return shim.success();
    }
    try {
      let payload = await method(stub, ret.params);
      return shim.success(payload);
    } catch (err) {
      console.log(err);
      return shim.error(err);
    }
  }

  // Insert
  async insert(stub, args) {
    console.log("Truong: async insert!!!");
    if (args.length != 2) {
      throw new Error('Incorrect number of arguments. Expecting 2');
    }

    let ID = args[0];
    let Attrs = args[1];
    await stub.putState(ID, Buffer.from(JSON.stringify(Attrs)));
  }

  // Delete
  async delete(stub, args) {
    console.info("Truong: async delete!!!");
    if (args.length != 1) {
      throw new Error('Incorrect number of arguments. Expecting 1');
    }

    let ID = args[0];

    // Delete the key from the state in ledger
    await stub.deleteState(ID);
  }

  // query callback representing the query of a chaincode
  async query(stub, args) {
    if (args.length != 1) {
      throw new Error('Incorrect number of arguments. Expecting name of the person to query')
    }

    let jsonResp = {};
    let ID = args[0];

    // Get the state from the ledger
    let Result = await stub.getState(A);
    if (!Result) {
      jsonResp.error = 'Failed to get state for ' + ID;
      throw new Error(JSON.stringify(jsonResp));
    }

    jsonResp.ID = ID;
    jsonResp.Attrs = Result.toString();
    console.info('Query Response:');
    console.info(jsonResp);
    return Result;
  }
};

shim.start(new Chaincode());

但是当我输入以下行时:

docker exec -e "CORE_PEER_LOCALMSPID=Org1MSP" -e "CORE_PEER_MSPCONFIGPATH=/etc/hyperledger/msp/users/Admin@org1.example.com/msp" peer0.org1.example.com peer chaincode query -C mychannel -n mycc -c '{"Args":["insert", "1", {"name": "Dang Manh Truong", "date": "26/04/1995"}]}'

出现错误:

Error: chaincode argument error: json: cannot unmarshal array into Go struct field strArgs.Args of type string

这是否意味着 fabric 不接受 json 作为输入？请帮助我，非常感谢。

Answer 1

Args 必须是字符串数组。您将需要转义 JSON 内容:

"{\"name\":\"Dang Manh Truong\",\"date\":\"26\/04\/1995\"}"

peer ... -c '{"Args":["insert", "1","{\"name\":\"Dang Manh Truong\",\"date\":\"26\/04\/1995\"}"]}'