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;
}
