Getting Error: http: read on closed response body from Transaction Processor function in Hyperledger Composer

问题:

I've a fabric network running with a simple BNA. This BNA defines two types of participants viz. Corporate and Person. Here, each Person has a relationship with the corporate as shown below (cto file):

participant Corporate identified by corporateId {     o String corporateId     o String corporateName } participant Person identified by personId {     o String personId     --> Corporate corporate } 

What I'm trying to do:

1. Create a Corporate using Transaction Processor Function: Success
2. Create a Person using Transaction Processor Function: Failure

Following is the snippet from transaction processor function for #2:

let corporateIdExpected = personDetails.corporate;  if(corporateIdExpected && corporateIdExpected != '') {     let corporateRetrieved = await query("GetCorporateByCorporateId", {corporateId: corporateIdExpected});     if(!corporateRetrieved || corporateRetrieved == '') {         throw new Error("Corporate details not valid. Please check if your corporate is present on the network.");     } } 

Snippet from my queries.qry:

query GetCorporateByCorporateId {   description: "Returns all corporates in the registry"   statement:         SELECT  org.samplenetwork.participants.Corporate           WHERE (corporateId == _$corporateId) } 

So, I get the following error when I try the #2:

Error: 2 UNKNOWN: error executing chaincode: transaction returned with failure: Error: Error: http: read on closed response body

However, when I try to execute the query directly from the swagger, it runs successfully.

I'm using:

Hyperledger Fabric: 1.1 Hyperledger Composer: 0.19.8

Am I missing out any checks or steps for this one?

回答1:

for item 2 - you don't really need to execute a named query each time.

You can do the equivalent check ("does he exist already?") as follows (where trxn below is the transaction object defined in your transaction definition etc):

const personRegistry = await getParticipantRegistry('org.acme.example.Person'); console.log("The person identifier to check is " + trxn.corporate.getIdentifier() )   const exists = await personRegistry.exists(trxn.corporate.getIdentifier() ) ;  console.log("exists is set to " + exists); // boolean  if (exists)         console.log("he exists")  else         console.log("he doesn't exist"); 

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