fabric区块链(十三)—fabric中GetBlockByNumber乱码

2023-08-09 16:19:51 浏览数 (2)

fabric中GetBlockByNumber乱码

一,问题描述

peer chaincode query -C mychannel -n qscc -c ‘{“Args”:[“GetBlockByNumber”, “mychannel”, “3”]}’

二,GetBlockByNumber源码

代码语言:javascript复制
func getBlockByNumber(vledger ledger.PeerLedger, number []byte) pb.Response {
	if number == nil {
		return shim.Error("Block number must not be nil.")
	}
	bnum, err := strconv.ParseUint(string(number), 10, 64)
	if err != nil {
		return shim.Error(fmt.Sprintf("Failed to parse block number with error %s", err))
	}
	block, err := vledger.GetBlockByNumber(bnum)
	if err != nil {
		return shim.Error(fmt.Sprintf("Failed to get block number %d, error %s", bnum, err))
	}
	// TODO: consider trim block content before returning
	//  Specifically, trim transaction 'data' out of the transaction array Payloads
	//  This will preserve the transaction Payload header,
	//  and client can do GetTransactionByID() if they want the full transaction details

	bytes, err := protoutil.Marshal(block)
	if err != nil {
		return shim.Error(err.Error())
	}

	return shim.Success(bytes)
}
发现返回的bytes数组是经过protoutil.Marshal加密的,所以获取后要进行解密

三,问题解决

代码语言:javascript复制
  public Block getBlockByNumber(Contract contract, String blockNumber) throws GatewayException, InvalidProtocolBufferException {
      
      FabricLogger.info(this,"n--> Evaluate Transaction: GetBlockByNumber, block number : " blockNumber);
      
      byte[] evaluateResult = contract.evaluateTransaction("GetBlockByNumber",Constant.ASOM_CHANNEL,blockNumber);
      
      //这里对byte数组进行解析,形成block对象
      Block block = Block.parseFrom(evaluateResult);

      FabricLogger.info(this,"block data:" block.getData());
      FabricLogger.info(this,"block data hash:" block.getHeader().getDataHash());
      
//这里进行protoutil.unMarshal解密
      String result = JsonFormat.printer().print(block);
      FabricLogger.info(this,"result : " result);

      return block;
      
  }

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