A wrapper consumer around Confluent .NET IConsumer<string, string> to make easier use of Kafka consumers.
You can install the package via NuGet Package Manager.
PM > Install-Package Trendyol.Confluent.Kafka
Implement a consumer class deriving from KafkaConsumer:
class EventConsumer : KafkaConsumer
{
protected override async Task OnConsume(ConsumeResult<string, string> result)
{
await DoWork(result);
}
protected override async Task OnError(Exception exception, ConsumeResult<string, string>? result)
{
await DoWorkForException(exception, result);
}
}You can create an instance of your EventConsumer via using default constructor and Initialize(config) method:
var config = new KafkaConfiguration()
{
Topic = "MyEvent",
BootstrapServers = "BOOTSTRAP_SERVERS",
GroupId = "myEventGroup",
};
var consumer = new EventConsumer();
consumer.Initialize(config);And then start your consumer via RunAsync method, you can either give a CancellationToken or use the default token:
await consumer.RunAsync();or
var cts = new CancellationTokenSource();
await consumer.RunAsync(cts.Token);Register your KafkaConsumer using AddKafkaConsumer extension method:
services.AddKafkaConsumer<MyConsumer>(configuration =>
{
configuration.Topic = "MyTopic";
configuration.GroupId = "MyGroup";
configuration.BootstrapServers = "BOOTSTRAP_SERVERS";
});And use all your registered services in your derived consumer:
public class MyConsumer : KafkaConsumer
{
private readonly IService _service;
public MyConsumer(IService service)
{
_service = service;
}
protected override async Task OnConsume(ConsumeResult<string, string> result)
{
await _service.DoWorkAsync(result);
}
protected override async Task OnError(Exception exception, ConsumeResult<string, string>? result)
{
await _service.DoWorkForExceptionAsync(exception, result);
}
}