如何在 hyperledger composer 中获取特定资产的交易历史记录?

How to get history of transactions for particular Asset in hyperledger composer?

我试过下面的代码,但我无法获取特定资产的交易历史,有人能帮我解决这个问题吗?

@commit(假)

@returns(订单[])

交易订单历史{

o 字符串订单号

}在此处输入代码

/** * 样本交易 * @param {org.acme.Block.orderHistory} 购买 * @交易 */ 异步函数 orderHistory(transaction) {

    const orderNumber = purchase.orderNumber;
    const nativeSupport = purchase.nativeSupport;

    const assetRegistry = await getAssetRegistry('org.acme.Block.Order')

    const nativeKey = getNativeAPI().createCompositeKey('Asset:org.acme.Block.Order', [orderNumber]);
    console.log(nativeKey);
    const iterator = await getNativeAPI().getHistoryForKey(nativeKey);
    let results = [];
    let res = {done : false};
    while (!res.done) {
        res = await iterator.next();

        if (res && res.value && res.value.value) {
            console.log(res);
            let val = res.value.value.toString('utf8');
            if (val.length > 0) {
               results.push(JSON.parse(val));
            }
        }
        if (res && res.done) {
            try {
                iterator.close();
            }
            catch (err) {
            }
        }
    }

    return results;

在 hyperledger composer 中,所有交易都存储在 Historian Record 中 (https://hyperledger.github.io/composer/unstable/reference/historian.html)。所以查询和使用相同的将解决您的问题。 Historian 记录是在 Hyperledger composer 命名空间中定义的资产。

历史记录定义为:

asset HistorianRecord identified by transactionId {
  o String      transactionId
  o String      transactionType
  --> Transaction transactionInvoked
  --> Participant participantInvoking  optional
  --> Identity    identityUsed         optional
  o Event[]       eventsEmitted        optional
  o DateTime      transactionTimestamp
}

您可以阅读有关 Historian Client API 的更多信息,这将证明对您有用:https://hyperledger.github.io/composer/v0.19/api/client-historian

此外,请阅读有关作曲家资产历史的讨论:https://github.com/hyperledger/composer/issues/2458