public GetEventStore(EventStoreClientSettings settings, IJsonSerializer serializer)
{
this.serializer = serializer;
client = new EventStoreClient(settings);
projectionClient = new EventStoreProjectionClient(settings, StreamPrefix);
}
public GetEventStoreSubscription(
IEventSubscriber subscriber,
EventStoreClient client,
EventStoreProjectionClient projectionClient,
IJsonSerializer serializer,
string?position,
string?prefix,
string?streamFilter)
{
Task.Run(async() =>
{
var ct = cts.Token;
var streamName = await projectionClient.CreateProjectionAsync(streamFilter);
async Task OnEvent(StreamSubscription subscription, ResolvedEvent @event,
CancellationToken ct)
{
var storedEvent = Formatter.Read(@event, prefix, serializer);
await subscriber.OnEventAsync(this, storedEvent);
}
void OnError(StreamSubscription subscription, SubscriptionDroppedReason reason, Exception? ex)
{
if (reason != SubscriptionDroppedReason.Disposed &&
reason != SubscriptionDroppedReason.SubscriberError)
{
ex ??= new InvalidOperationException($"Subscription closed with reason {reason}.");
subscriber.OnErrorAsync(this, ex);
}
}
if (!string.IsNullOrWhiteSpace(position))
{
var streamPosition = position.ToPosition(true);
subscription = await client.SubscribeToStreamAsync(streamName, streamPosition,
OnEvent, true,
OnError,
cancellationToken: ct);
}
else
{
subscription = await client.SubscribeToStreamAsync(streamName,
OnEvent, true,
OnError,
cancellationToken: ct);
}
}, cts.Token);
}
