static async Task <int> Main(string[] args)
{
var app = new CommandLineApplication();
app.FullName = "Event Hubs Consumer";
app.Description = "Event Hubs Consumer Sample";
app.HelpOption("-h|-?|--help");
var hubName = String.Empty;
var connectionString = app.Option("-cs", "Specify ConnectionString", CommandOptionType.SingleValue, true);
var group = app.Option("-cg", "Specify Consumer Group", CommandOptionType.SingleValue);
var hub = app.Option("-hub", "Specify Event Hub", CommandOptionType.SingleValue);
var allEvents = app.Option("-all", "Read all events", CommandOptionType.NoValue);
app.Execute(args);
if (!connectionString.HasValue() || string.IsNullOrEmpty(connectionString.Value()))
{
ShowHelp();
return(0);
}
var csValue = connectionString.Value().Replace("\"", "").Trim();
var csValueItems = csValue.Split(";");
foreach (var csValueItem in csValueItems)
{
var valuePair = csValueItem.Split("=");
if (valuePair[0].ToLower() == "entitypath")
{
hubName = valuePair[1];
break;
}
}
if (hubName == String.Empty)
{
if (!hub.HasValue() || string.IsNullOrEmpty(hub.Value()))
{
ShowHelp();
return(0);
}
else
{
hubName = hub.Value().Replace("\"", "").Trim();
}
}
//
// https://docs.microsoft.com/en-us/dotnet/api/azure.messaging.eventhubs.consumer.eventhubconsumerclient?view=azure-dotnet
// Select Consumer Group
//
string consumerGroup;
if (group.HasValue() && !string.IsNullOrEmpty(group.Value()))
{
consumerGroup = group.Value().Replace("\"", "").Trim();
}
else
{
consumerGroup = EventHubConsumerClient.DefaultConsumerGroupName;
}
Console.WriteLine("Connection String : {0}....", connectionString.Value().Replace("\"", "").Trim().Substring(0, 50));
Console.WriteLine($"Event Hub : {hubName}");
Console.WriteLine($"Consumer Group : {consumerGroup}");
Console.WriteLine($"Read all events : {allEvents.HasValue()}");
Console.WriteLine($"Timeout : {readTimetoutSeconds} seconds");
EventHubConsumerClient consumer = new EventHubConsumerClient(consumerGroup, connectionString.Value().Replace("\"", "").Trim(), hubName);
var part = await consumer.GetPartitionIdsAsync();
var part_prop = await consumer.GetPartitionPropertiesAsync(part[0]);
var hub_prop = await consumer.GetEventHubPropertiesAsync();
using CancellationTokenSource cancellationSource = new CancellationTokenSource();
cancellationSource.CancelAfter(TimeSpan.FromSeconds(readTimetoutSeconds));
//
// https://docs.microsoft.com/en-us/dotnet/api/azure.messaging.eventhubs.consumer.eventhubconsumerclient.readeventsasync?view=azure-dotnet
//
// Timeout 10 Min
//
ReadEventOptions readOptions = new ReadEventOptions
{
MaximumWaitTime = TimeSpan.FromSeconds(600)
};
try
{
Console.WriteLine($"Read Start : {DateTime.Now.ToString()}");
Console.WriteLine("Waiting for events. CTRL+C to exit");
//
// If this is IoT Hub Eventhub Compatible Endpoint, device id is in ev.Data.SystemProperties["iothub-connection-device-id"]
//
await foreach (PartitionEvent ev in consumer.ReadEventsAsync(startReadingAtEarliestEvent: allEvents.HasValue(), readOptions, cancellationSource.Token))
{
Console.WriteLine("Enqueue at {0:yyyy/MM/dd H:mm:ss:fff} | Seq # {1:D4} | Partition {2} | Offset : {3:D6} | {4}",
ev.Data.EnqueuedTime,
ev.Data.SequenceNumber,
ev.Partition.PartitionId,
ev.Data.Offset,
Encoding.UTF8.GetString(ev.Data.Body.ToArray())
);
}
}
catch (Exception ex)
{
Console.WriteLine($"Exception : {ex.Message}");
}
Console.WriteLine($"Read Exit : {DateTime.Now.ToString()}");
return(1);
}
public async Task <string[]> GetPartitionsAsync() => (await _client.GetEventHubPropertiesAsync().ConfigureAwait(false)).PartitionIds;
