protected async Task Handler(ReceivedEvent re, CancellationToken cancellationToken)
{
_debugLog?.Invoke(
"Subscription {Subscription} got an event {EventType}",
SubscriptionId,
re.EventType
);
_lastProcessed = GetPosition(re);
if (re.EventType.StartsWith("$") || re.Data.IsEmpty)
{
await Store();
return;
}
try {
var contentType = string.IsNullOrWhiteSpace(re.ContentType) ? "application/json" : re.ContentType;
if (contentType != _eventSerializer.ContentType)
{
throw new InvalidOperationException($"Unknown content type {contentType}");
}
object?evt;
try {
evt = _eventSerializer.Deserialize(re.Data.Span, re.EventType);
}
catch (Exception e) {
_log?.LogError(
e,
"Error deserializing event {Strean} {Position} {Type}",
re.OriginalStream,
re.StreamPosition,
re.EventType
);
throw;
}
if (evt != null)
{
await Task.WhenAll(
_eventHandlers.Select(x => x.HandleEvent(evt, (long?)re.GlobalPosition, cancellationToken))
);
}
}
catch (Exception e) {
_log?.LogWarning(
e,
"Error when handling the event {Strean} {Position} {Type}",
re.OriginalStream,
re.StreamPosition,
re.EventType
);
}
await Store();
Task Store() => StoreCheckpoint(GetPosition(re), cancellationToken);
static EventPosition GetPosition(ReceivedEvent receivedEvent) => new(receivedEvent.StreamPosition, receivedEvent.Created);
