在Hyperledger Composer事务中以确定性方式获取时间戳 [英] Getting timestamps in deterministic way in Hyperledger Composer transactions

问题描述

是否有确定的方法来获取事务功能中的时间戳，类似于可以在Go版本的Fabric链码中使用的stub.GetTxTimestamp().

Is there a deterministic way to get timestamp in transaction function, similar to stub.GetTxTimestamp() that can be used in Go version of Fabric's chaincode.

推荐答案

只需共享一个适用于basic-sample-network网络的示例:

Just sharing an example that works with basic-sample-network network:

在模型文件(lib/org.acme.sample.cto)中，我扩展了SampleAsset定义，添加了名为DateTime类型的所有添加的新属性，称为timestamp:

In the model file (lib/org.acme.sample.cto) I extended SampleAsset definition any added new property called timestamp of type DateTime:

asset SampleAsset identified by assetId {
  o String assetId
  --> SampleParticipant owner
  o String value
  o DateTime timestamp
}

在脚本文件(lib/logic.js)中，onSampleTransaction函数使用当前事务的时间戳更新SampleAsset的timestamp:

In the script file (lib/logic.js), the onSampleTransaction function to update SampleAsset's timestamp with current transaction's timestamp:

function onSampleTransaction(sampleTransaction) {
  sampleTransaction.asset.value = sampleTransaction.newValue;
  sampleTransaction.asset.timestamp = sampleTransaction.timestamp;
  return getAssetRegistry('org.acme.sample.SampleAsset')
       .then(function (assetRegistry) {
               return assetRegistry.update(sampleTransaction.asset);
        });
}

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