查询Hyperledger Historian的问题 [英] Problem of querying the Hyperledger Historian

问题描述

我正在开发Hyperledger编写器应用程序，我想将所有与交易相关的数据(例如交易类型，交易ID和时间戳)发送给参与其中的特定利益相关者.我创建了以下查询，以从历史学家那里获取数据.

I am developing Hyperledger composer application and I want to get all the transactions related data like transaction type,transaction Id and timestamp to a particular stakeholder who involved in. I created following query to get data from historian.

 query getFromHistorian {
     description:"get user transactions"
     statement:
         SELECT org.hyperledger.composer.system.HistorianRecord
         WHERE (participantInvoking == _$stakeholder)
 }  

但是，当我通过使用REST API提供利益相关者ID来执行此查询时，它会提供空的响应正文.我该如何解决它，我做对了吗?

But when I execute this query by giving a stakeholder id using REST API it serve empty response body. How can I fix it and did I do the right thing ?

推荐答案

您必须确保当前的参与者有权读取permissons.acl文件中的历史记录，否则查询将始终返回空数组.

You have to make sure that the current participant have permissions to READ the historian in the permissons.acl file or the query will always returns empty array.

rule ParticipantWhoCanReadHistorian {
  description: "this type of participants can read HistorianRecord to the Historian"
  participant: "the participant name space"
  operation: READ
  resource: "org.hyperledger.composer.system.HistorianRecord"
  action: ALLOW  
}

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