public static Summary.Child WithConsumerLabels(this Summary summary, ICompetingConsumer consumer) => summary.WithLabels(AppName, consumer.StreamName, consumer.GroupName);
private string GetConsumerId(ICompetingConsumer consumer)
{
return(consumer.GetType().Name);
}
public static Gauge.Child WithConsumerLabels(this Gauge counter, ICompetingConsumer consumer) => counter.WithLabels(AppName, consumer.StreamName, consumer.GroupName);
private Func <EventStorePersistentSubscriptionBase, ResolvedEvent, Task> OnEventAppeared(ICompetingConsumer consumer)
{
return(async(sub, e) =>
{
DittoMetrics.ReceivedEvents.WithConsumerLabels(consumer).Inc();
DittoMetrics.CurrentEvent.WithConsumerLabels(consumer).Set(e.OriginalEventNumber);
if (!e.IsResolved) // Handle deleted streams
{
_logger.Information("Event #{EventNumber} from {StreamName} is not resolved. Skipping", e.OriginalEventNumber, consumer.StreamName);
// log
DittoMetrics.UnresolvedEvents.WithConsumerLabels(consumer).Inc();
sub.Fail(e, PersistentSubscriptionNakEventAction.Skip, "Unresolved Event");
return;
}
double delaySeconds = (DateTime.UtcNow - e.Event.Created).TotalSeconds;
DittoMetrics.ReplicationLatency.WithConsumerLabels(consumer).Observe(delaySeconds);
if (!consumer.CanConsume(e.Event.EventType))
{
_logger.Information("Unable to consume {EventType} #{EventNumber} from {StreamName}. Skipping", e.Event.EventType, e.OriginalEventNumber, consumer.StreamName);
DittoMetrics.SkippedEvents.WithConsumerLabels(consumer).Inc();
sub.Fail(e, PersistentSubscriptionNakEventAction.Skip, "Cannot consume");
return;
}
string consumerId = GetConsumerId(consumer);
try
{
await consumer.ConsumeAsync(e.Event.EventType, e);
DittoMetrics.ProcessedEvents.WithConsumerLabels(consumer).Inc();
sub.Acknowledge(e);
}
catch (Exception ex)
{
DittoMetrics.FailedEvents.WithConsumerLabels(consumer).Inc();
_logger.Error(ex, "{Consumer} failed to handle {EventType} #{EventNumber} from {StreamName} in group {GroupName}",
consumerId, e.Event.EventType, e.OriginalEventNumber, consumer.StreamName, consumer.GroupName);
sub.Fail(e, PersistentSubscriptionNakEventAction.Retry, ex.Message);
}
});
}
