public Task StartAsync(CancellationToken cancellationToken)
{
var conf = new ConsumerConfig
{
GroupId = "test-consumer-group",
BootstrapServers = "localhost:9092",
AutoOffsetReset = AutoOffsetReset.Earliest
};
using (var c = new ConsumerBuilder <int, string>(conf).Build())
{
c.Subscribe("fila_hello_world");
var cts = new CancellationTokenSource();
try
{
while (true)
{
var message = c.Consume(cts.Token);
bool success = true;
var settings = new JsonSerializerSettings
{
Error = (sender, args) => { success = false; args.ErrorContext.Handled = true; }
};
MessageDto messageObj = JsonConvert.DeserializeObject <MessageDto>(message.Message.Value, settings);
int ident = message.Message.Key;
_logger.LogInformation("Mensagem: " + messageObj.Message);
_logger.LogInformation("ApplicationId: " + messageObj.ApplicationId);
_logger.LogInformation("RequestId: " + messageObj.RequestId);
_logger.LogInformation("Timestamp: " + messageObj.Timestamp);
_logger.LogInformation("Kafka Key: " + ident);
}
}
catch (OperationCanceledException)
{
c.Close();
}
}
return(Task.CompletedTask);
}
private async void DoWork(object state)
{
try
{
_logger.LogInformation("Timed Background Service is working.");
var config = new ProducerConfig {
BootstrapServers = "localhost:9092"
};
using (var producer = new ProducerBuilder <int, string>(config).Build())
{
try
{
MessageDto message = new MessageDto()
{
ApplicationId = Process.GetCurrentProcess().Id,
Message = "Hello World",
RequestId = Guid.NewGuid().ToString(),
Timestamp = DateTime.Now
};
var sendResult = producer
.ProduceAsync("fila_hello_world", new Message <int, string> {
Key = new Random().Next(int.MaxValue), Value = JsonConvert.SerializeObject(message)
})
.GetAwaiter()
.GetResult();
}
catch (ProduceException <Null, string> e)
{
Console.WriteLine($"Delivery failed: {e.Error.Reason}");
}
}
}
catch (Exception ex)
{
_logger.LogError(ex, "Error sending message to Kafka");
}
}
