在Corda中，如何获取交易发生的时间戳？ [英] In Corda, how to get the timestamp of when a transaction happened?

问题描述

我正在使用Corda 3.2。给定 SignedTransaction ，如何确定何时记录？

I am using Corda 3.2. Given a SignedTransaction, how can I establish when it was recorded?

推荐答案

没有直接的API可以确定何时记录交易。但是，您可以通过以下任一方法来实现此目的：

There is no direct API for determining when a transaction was recorded. However, you can achieve this by checking either:

1. 当消耗了一笔交易的输入时：

1. When one of the transaction's inputs was consumed:

val inputStateRef = signedTx.inputs[0]
val queryCriteria = QueryCriteria.VaultQueryCriteria(stateRefs = listOf(inputStateRef))
val results = serviceHub.vaultService.queryBy<ContractState>(queryCriteria)
val consumedTime = results.statesMetadata.single().consumedTime!!

记录到交易的输出之一时：

When one of the transaction's outputs was recorded:

val ledgerTx = signedTx.toLedgerTransaction(serviceHub)
val outputStateRef = StateRef(signedTx.id, 0)
val queryCriteria = QueryCriteria.VaultQueryCriteria(stateRefs = listOf(outputStateRef))
val results = serviceHub.vaultService.queryBy<ContractState>(queryCriteria)
val recordedTime = results.statesMetadata.single().recordedTime

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