Listen to a custom chaincode event in Hyperledger Fabric

Question

After using SetEvent() in the chaincode, how is possible to test it? Does exist some working example?

Answer 1

You could create an application which is listening on the chaincode event.

I suggest you to have a look at the "Chaincode event listener" section of this link, which is the official Hyperledger Fabric Nodejs SDK.

https://fabric-sdk-node.github.io/tutorial-channel-events.html

First is necessary to configure the client correctly. Once it has been configured:

//... client configuration

var channel = fabric_client.getChannel();
var eventHub = channel.getChannelEventHubsForOrg(<NAME OF YOUR ORG>)[0];

eventHub.connect(true);
eventHub.registerChaincodeEvent(CHAINCODE_ID,EVENT_NAME,
    (event, block_num, txnid, status)=>{
        console.log('Successfully got a chaincode event with transid:'+ txnid + ' with status:'+status);
        console.log('Successfully received the chaincode event on block number '+ block_num);
        console.log(event);
    },
    (error)=>{
        console.log('Failed to receive the chaincode event ::'+error);
    }
);