Azure Event hub usage

Posted 2020-06-24 _iorilan

1. create event hub on azure

2. create a prj , event hub sender, install nuget pkg - azure service bus



3. check connection string



4. sender sample code

static void Main(string[] args)
        {
            Console.WriteLine("Press Ctrl-C to stop the sender process");
            Console.WriteLine("Press Enter to start now");
            Console.ReadLine();
            SendingRandomMessages();
        }


        static string eventHubName = "get from event hub connection information";
        static string connectionString = "get from event hub connection information";


        static void SendingRandomMessages()
        {
            var eventHubClient = EventHubClient.CreateFromConnectionString(connectionString, eventHubName);
            while (true)
            {
                try
                {
                    var message = Guid.NewGuid().ToString();
                    Console.WriteLine("{0} > Sending message: {1}", DateTime.Now, message);
                    eventHubClient.Send(new EventData(Encoding.UTF8.GetBytes(message)));
                }
                catch (Exception exception)
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.WriteLine("{0} > Exception: {1}", DateTime.Now, exception.Message);
                    Console.ResetColor();
                }


                Thread.Sleep(200);
            }
        }

5. create a storage account

6. install nuget for receiver prj



7. check keys



8. sample code for receiver

class SimpleEventProcessor : IEventProcessor
    {
        Stopwatch checkpointStopWatch;


        async Task IEventProcessor.CloseAsync(PartitionContext context, CloseReason reason)
        {
            Console.WriteLine("Processor Shutting Down. Partition ‘{0}‘, Reason: ‘{1}‘.", context.Lease.PartitionId, reason);
            if (reason == CloseReason.Shutdown)
            {
                await context.CheckpointAsync();
            }
        }


        Task IEventProcessor.OpenAsync(PartitionContext context)
        {
            Console.WriteLine("SimpleEventProcessor initialized.  Partition: ‘{0}‘, Offset: ‘{1}‘", context.Lease.PartitionId, context.Lease.Offset);
            this.checkpointStopWatch = new Stopwatch();
            this.checkpointStopWatch.Start();
            return Task.FromResult<object>(null);
        }


        async Task IEventProcessor.ProcessEventsAsync(PartitionContext context, IEnumerable<EventData> messages)
        {
            foreach (EventData eventData in messages)
            {
                string data = Encoding.UTF8.GetString(eventData.GetBytes());


                Console.WriteLine(string.Format("Message received.  Partition: ‘{0}‘, Data: ‘{1}‘",
                    context.Lease.PartitionId, data));
            }


            //Call checkpoint every 5 minutes, so that worker can resume processing from 5 minutes back if it restarts.
            if (this.checkpointStopWatch.Elapsed > TimeSpan.FromMinutes(5))
            {
                await context.CheckpointAsync();
                this.checkpointStopWatch.Restart();
            }
        }
    }


static void Main(string[] args)
        {
            string eventHubConnectionString = "get from azure event hub connection information";
            string eventHubName = "get from azure event hub connection information";
            string storageAccountName = "get from azure storage keys";
            string storageAccountKey = "get from azure storage keys";
            string storageConnectionString = string.Format("DefaultEndpointsProtocol=https;AccountName={0};AccountKey={1}", storageAccountName, storageAccountKey);


            string eventProcessorHostName = Guid.NewGuid().ToString();
            EventProcessorHost eventProcessorHost = new EventProcessorHost(eventProcessorHostName, eventHubName, EventHubConsumerGroup.DefaultGroupName, eventHubConnectionString, storageConnectionString);
            Console.WriteLine("Registering EventProcessor...");
            var options = new EventProcessorOptions();
            options.ExceptionReceived += (sender, e) => { Console.WriteLine(e.Exception); };
            eventProcessorHost.RegisterEventProcessorAsync<SimpleEventProcessor>(options).Wait();


            Console.WriteLine("Receiving. Press enter key to stop worker.");
            Console.ReadLine();
            eventProcessorHost.UnregisterEventProcessorAsync().Wait();
        }