private async Task DoWork(CancellationToken stoppingToken)
{
var config = new ConsumerConfig
{
GroupId = ConsumerGroup,
BootstrapServers = KafkaServers,
AutoOffsetReset = AutoOffsetReset.Earliest
};
_logger.Information($"{GetType().Name}: Creating consumer for '{ConsumerGroup}' pointed at '{KafkaServers}'.");
using var consumer = new ConsumerBuilder <Ignore, string>(config).Build();
_logger.Information($"{GetType().Name}: Subscribing the consumer to topic '{KafkaTopic}'.");
consumer.Subscribe(KafkaTopic);
try
{
while (!stoppingToken.IsCancellationRequested)
{
try
{
_logger.Information($"{GetType().Name}: Consuming next message.");
var result = consumer.Consume(stoppingToken);
_logger.Information($"{GetType().Name}: Consumed message '{result.Message.Value}' at offset '{result.TopicPartitionOffset}'.");
if (_messageDeserializer.TryDeserializeEvent(result.Message.Value, out BookingCreated bookingCreated))
{
_logger.Information($"{GetType().Name}: Message {result.Message.Value} is recognized by {GetType().Name} as {nameof(BookingCreated)} event and will be processed.");
await _busControl.Send <IBookingCreated>(
new
{
bookingCreated.BookingId,
DateTime.UtcNow
}, stoppingToken);
_logger.Information($"{GetType().Name}: Message {result.Message.Value} was processed.");
continue;
}
_logger.Information($"{GetType().Name}: Message {result.Message.Value} is not recognized by {GetType().Name} and will be skipped.");
}
catch (ConsumeException e)
{
_logger.Error($"{GetType().Name}: Error occurred: {e.Error.Reason}.");
}
}
}
catch (OperationCanceledException)
{
// Ensure the consumer leaves the group cleanly and final offsets are committed.
consumer.Close();
}
}