Find the source of an azure servicebus message

Question

I have an azure service bus with topics and subscriptions. One of the topics is getting filled with messages but we are not sure whowhat created these messages. Is there a way to track the connections to the service bus and figure out whowhat is trying to write these messages?

question from:https://stackoverflow.com/questions/65887070/find-the-source-of-an-azure-servicebus-message

Answer 1

Without any pre-set attributes, I don’t think you can get the source of the information. It is recommended that you use custom attributes and pass in the source information along with the message itself.

I assume you are using NODEJS, you can do something like below:

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

const connectionString = "Endpoint=sb://bowman1012.servicebus.windows.net/;SharedAccessKeyName=RootManageSharedAccessKey;SharedAccessKey=xxxxxx"
const topicName = "test";

const messages = [
    { body: "Albert Einstein",
      applicationProperties: {
        source: 'where the message comes from.'
      }
    }
 ];

 async function main() {
    // create a Service Bus client using the connection string to the Service Bus namespace
    const sbClient = new ServiceBusClient(connectionString);

    // createSender() can also be used to create a sender for a queue.
    const sender = sbClient.createSender(topicName);

    try {
        // Tries to send all messages in a single batch.
        // Will fail if the messages cannot fit in a batch.
        // await sender.sendMessages(messages);

        // create a batch object
        let batch = await sender.createMessageBatch(); 
        for (let i = 0; i < messages.length; i++) {
            // for each message in the arry         

            // try to add the message to the batch
            if (!batch.tryAddMessage(messages[i])) {            
                // if it fails to add the message to the current batch
                // send the current batch as it is full
                await sender.sendMessages(batch);

                // then, create a new batch 
                batch = await sender.createBatch();

                // now, add the message failed to be added to the previous batch to this batch
                if (!batch.tryAddMessage(messages[i])) {
                    // if it still can't be added to the batch, the message is probably too big to fit in a batch
                    throw new Error("Message too big to fit in a batch");
                }
            }
        }

        // Send the last created batch of messages to the topic
        await sender.sendMessages(batch);

        console.log(`Sent a batch of messages to the topic: ${topicName}`);

        // Close the sender
        await sender.close();
    } finally {
        await sbClient.close();
    }
}

// call the main function
main().catch((err) => {
    console.log("Error occurred: ", err);
    process.exit(1);
 });

API reference:

https://docs.microsoft.com/en-us/javascript/api/@azure/service-bus/servicebusmessage?view=azure-node-latest

Other language is similar.