to create persistent subscription for Azure service bus using node js

Question

So, I want to create a persistent subscription for the Azure service bus using Node Js. At the moment, it only executes successfully once. The following is the code I'm using.

var azure = require('azure');

var azureConnection = "Endpoint=sb:My connection string"

var retryOperations = new azure.ExponentialRetryPolicyFilter();
var serviceBusService = azure.createServiceBusService(azureConnection).withFilter(retryOperations);

serviceBusService.receiveSubscriptionMessage('mytopic01', 'mytopicsub', function (error, receivedMessage) {

    if (!error) {
        // // // Message received and deleted
        console.log(receivedMessage);
    }
});

Answer 1

My reference is a similar solution at GitHub provided by Azure Team. Actually, if your client application is an independent node.js application, you set up a cycle-program to receive a message from service bus in the loop, like so;

var azure = require('azure');
var sbService = azure.createServiceBusService(<connection_string>);
function checkForMessages(sbService, queueName, callback) {
  sbService.receiveSubscriptionMessage(queueName, { isPeekLock: true }, function (err, lockedMessage) {
    if (err) {
      if (err === 'No messages to receive') {
        console.log('No messages');
      } else {
        callback(err);
      }
    } else {
      callback(null, lockedMessage);
    }
  });
}
function processMessage(sbService, err, lockedMsg) {
  if (err) {
    console.log('Error on Rx: ', err);
  } else {
    console.log('Rx: ', lockedMsg);
    sbService.deleteMessage(lockedMsg, function(err2) {
      if (err2) {
        console.log('Failed to delete message: ', err2);
      } else {
        console.log('Deleted message.');
      }
    })
  }
}
setInterval(checkForMessages.bind(null, sbService, queueName, processMessage.bind(null, sbService)), 5000);