How to consume latest events using Azure Event Hubs Go SDK (azeventhubs)?

php editor Strawberry brings you a guide on how to use the latest events using Azure Event Hubs Go SDK (azeventhubs). Azure Event Hubs is a highly scalable, real-time data transfer service that can be used to process large amounts of event data. In this guide, we'll cover how to use the azeventhubs package to interact with Azure Event Hubs and demonstrate how to use the latest events feature to get real-time data. Through the guidance of this article, you will be able to easily use Azure Event Hubs in Go applications and take advantage of the latest event capabilities to obtain and process real-time data.

Question content

I am migrating from azure-event-hubs-go/v3 to the newer azeventhubs Go SDK. In older versions of the SDK, there was a ReceiveOption parameter that allowed me to specify where to start consuming events.

In the new SDK, I use the following code to initialize the processor:

processor, err := azeventhubs.NewProcessor(
    e.ConsumerClient, 
    checkpointStore, 
    &azeventhubs.ProcessorOptions{
        UpdateInterval: time.Second, 
        Prefetch: 0, 
        StartPositions: azeventhubs.StartPositions{
            Default: azeventhubs.StartPosition{
                Latest: to.Ptr(true), 
                EnqueuedTime: to.Ptr(time.Now()), 
                Inclusive: true
            }
        }
    }
)

However, I noticed that events are consumed from the last checkpoint instead of the most recently sent event.

What I tried: I've tried the ConsumingEventsUsingConsumerClient and ConsumingEventsWithCheckpoints examples but they behave the same way, consuming events from the last checkpoint instead of the most recent.

My expectations: I want the processor to start using the latest events sent from the device which sends a message every second. How can I achieve this behavior using azeventhubs Go SDK?

Solution

It was initially difficult for me to grasp the underlying mechanism of AMQP. However, I'm happy to report that the issue has been successfully resolved.

var wg sync.WaitGroup
wg.Add(1)

for _, partition := range p.PartitionIDs {
    go func(partition string) {
        defer wg.Done()

        partitionClient, err := consumerClient.NewPartitionClient(partition, nil)
        if err != nil {
            panic(err)
        }

        receiveCtx, cancel := context.WithTimeout(context.TODO(), time.Second*30)
        defer cancel()

        for {
            events, err := partitionClient.ReceiveEvents(receiveCtx, 1, nil)

            if err != nil && !errors.Is(err, context.DeadlineExceeded) {
                panic(err)
            }

            for _, evt := range events {
                fmt.Printf("partition: %s\n", partition)
                fmt.Printf("Body: %s\n", string(evt.Body))
            }
        }
    }(partition)
}

wg.Wait()

I would like to express my gratitude to the Azure Customer Support Services team for their valuable assistance.

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