如何根据 Hyperledger 结构中的链代码获取所有交易历史记录

Question

我能够在 Hyperledger（结构实现）中进行交易。我想查看用户通过传递用户密钥发起的所有交易及其负载详细信息。

例如：

A transfers 10 units to B
A transfers 5 units to C
D transfers 8 units to A

当我传递 A 的密钥时，fabric 必须向我提供 A 的所有交易。有什么办法吗？或者我应该使用哪个结构 API 函数调用？

Answer 1

您可以在您的链代码中开发适当的索引和查询功能。

意味着您将每笔交易的详细信息存储在内部 key/value 商店 (stub.PutState) 中，用户作为键，return 所有与您查询中的用户关联的交易(stub.GetState).

Answer 2

/chain/blocks/{Block} 端点携带 指定区块中的有序交易列表 。

使用 /chain 端点获取链的高度（块数），然后使用 /chain/blocks/{Block} REST 端点从每个块检索交易。

Answer 3

最好和最简单的方法是使用 shim 包 函数

GetHistoryForKey(key string)

如文档所述：

GetHistoryForKey function can be invoked by a chaincode to return a history of key values across time. GetHistoryForKey is intended to be used for read-only queries.

Answer 4

如果有人需要 Java SDK 和 go 链码组合。给你

在这里回答

Java code

public List<HistoryDao> getUFOHistory(String key) throws Exception {
    String[] args = { key };
    Logger.getLogger(QueryChaincode.class.getName()).log(Level.INFO, "UFO communication history - " + args[0]);

    Collection<ProposalResponse> responses1Query = ucc.getChannelClient().queryByChainCode("skynetchaincode", "getHistoryForUFO", args);
    String stringResponse = null;
    ArrayList<HistoryDao> newArrayList = new ArrayList<>();
    for (ProposalResponse pres : responses1Query) {
        stringResponse = new String(pres.getChaincodeActionResponsePayload());
        Logger.getLogger(QueryChaincode.class.getName()).log(Level.INFO, stringResponse);
        newArrayList = gson.fromJson(stringResponse, new TypeToken<ArrayList<HistoryDao>>() {
        }.getType());
    }
    if (null == stringResponse)
        stringResponse = "Not able to find any ufo communication history";
    return newArrayList;
}

你去chancode实现如下

Go code

func (t *SmartContract) getHistoryForUFO(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

    if len(args) < 1 {
            return shim.Error("Incorrect number of arguments. Expecting 1")
    }

    ufoId := args[0]
    resultsIterator, err := APIstub.GetHistoryForKey(ufoId)
    if err != nil {
            return shim.Error(err.Error())
    }
    defer resultsIterator.Close()

    var buffer bytes.Buffer
    buffer.WriteString("[")

    bArrayMemberAlreadyWritten := false
    for resultsIterator.HasNext() {
            response, err := resultsIterator.Next()
            if err != nil {
                    return shim.Error(err.Error())
            }
            // Add a comma before array members, suppress it for the first array member
            if bArrayMemberAlreadyWritten == true {
                    buffer.WriteString(",")
            }
            buffer.WriteString("{\"TxId\":")
            buffer.WriteString("\"")
            buffer.WriteString(response.TxId)
            buffer.WriteString("\"")

            buffer.WriteString(", \"Value\":")
            // if it was a delete operation on given key, then we need to set the
            //corresponding value null. Else, we will write the response.Value
            //as-is (as the Value itself a JSON)
            if response.IsDelete {
                    buffer.WriteString("null")
            } else {
                    buffer.WriteString(string(response.Value))
            }

            buffer.WriteString(", \"Timestamp\":")
            buffer.WriteString("\"")
            buffer.WriteString(time.Unix(response.Timestamp.Seconds, int64(response.Timestamp.Nanos)).String())
            buffer.WriteString("\"")

            buffer.WriteString(", \"IsDelete\":")
            buffer.WriteString("\"")
            buffer.WriteString(strconv.FormatBool(response.IsDelete))
            buffer.WriteString("\"")

            buffer.WriteString("}")
            bArrayMemberAlreadyWritten = true
    }
    buffer.WriteString("]")

    fmt.Printf("- History returning:\n%s\n", buffer.String())
    return shim.Success(buffer.Bytes())

}

如果您有疑问，请告诉我。

Answer 5

如果您使用的是 composer-client，您可以简单地使用 Historian 命令。

 var historian = await businessNetworkConnection.getHistorian();
 historian.getAll().then(historianRecords => console.log(historianRecords));

如何根据 Hyperledger 结构中的链代码获取所有交易历史记录

How to get all transaction history against a chaincode in Hyperledger fabric

hyperledger

hyperledger-fabric