how to set sessionId while using Service Bus Queue as output bindings for Azure Function with javascript

Question

Hello!

I am using an Azure Function with Javascript/TypeScript SDK where Azure Event Hub is the trigger and and Service Bus is the output. i.e. I am getting data from Event Hubs, then processing it in Azure Function, after that output the processed data to Service Bus Queue. As I need ordered Service Bus, I need to set SessionId. I see the option to bind message body. However, do not see where to bind the sessionId.

The Function provides something like this option for the Service Bus Output.

context.bindings.myServiceBus = myServiceBusMessageBody;

So where to put the sessionId?

Answer 1

Hello @AhsanHabib-1895 ,

Built-in output binding in javascript based function currently does not support setting message properties other than body. There is an open github issue similar to this. Also. please feel free to provide feedback as feature request here.

As an work around, you can use service bus client to send message to a queue instead of using output binding like below.

• You need to install @azure/service-bus npm package.

npm install @azure/service-bus

• Import the required service client at the top of your index.js.

const { ServiceBusClient } = require("@azure/service-bus");

• Follow the below code sample to directly use SB client to send message with session id: const sbClient = ServiceBusClient.createFromConnectionString(connectionString);
  const queueClient = sbClient.createQueueClient(queueName);
  const sender = queueClient.createSender();
  const message= {
  body: 'your message body, can be string, js object or byte array',
  sessionId: 'your session id'
  };
  await sender.send(message);

Also, if you prefer, you can leverage C# based function which has built-in support to set properties of BrokeredMessage object in output binding.

Please let me know if you have any question. Also if it helps, please consider accepting as answer which can help other community members with similar queries.