private Action <EventStoreCatchUpSubscription, SubscriptionDropReason, Exception> SubscriptionDropped(Projection projection)
=> (subscription, reason, ex) =>
{
// TODO: Reevaluate stopping subscriptions when issues with reconnect get fixed.
// https://github.com/EventStore/EventStore/issues/1127
// https://groups.google.com/d/msg/event-store/AdKzv8TxabM/VR7UDIRxCgAJ
subscription.Stop();
switch (reason)
{
case SubscriptionDropReason.UserInitiated:
Log.Debug("{projection} projection stopped gracefully.", projection);
break;
case SubscriptionDropReason.SubscribingError:
case SubscriptionDropReason.ServerError:
case SubscriptionDropReason.ConnectionClosed:
case SubscriptionDropReason.CatchUpError:
case SubscriptionDropReason.ProcessingQueueOverflow:
case SubscriptionDropReason.EventHandlerException:
Log.ErrorException(
"{projection} projection stopped because of a transient error ({reason}). " +
"Attempting to restart...",
ex, projection, reason);
Task.Run(() => StartProjection(projection));
break;
default:
Log.FatalException(
"{projection} projection stopped because of an internal error ({reason}). " +
"Please check your logs for details.",
ex, projection, reason);
break;
}
};
private static Action <EventStoreCatchUpSubscription> LiveProcessingStarted(Projection projection)
=> _ => Log.Debug("{projection} projection has caught up, now processing live!", projection);