async Task ReadEventsFromEventHorizon(
ConsentId consentId,
SubscriptionId subscriptionId,
IReverseCallClient <EventHorizonConsumerToProducerMessage, EventHorizonProducerToConsumerMessage, ConsumerSubscriptionRequest, Contracts.SubscriptionResponse, ConsumerRequest, ConsumerResponse> reverseCallClient)
{
_logger.Information("Successfully connected event horizon with {subscriptionId}. Waiting for events to process", subscriptionId);
var queue = new AsyncProducerConsumerQueue <StreamEvent>();
var eventsFetcher = new EventsFromEventHorizonFetcher(queue);
using var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(_cancellationToken);
var tasks = new List <Task>();
try
{
_subscriptions.TrySubscribe(
consentId,
subscriptionId,
new EventProcessor(consentId, subscriptionId, _eventHorizonEventsWriter, _eventProcessorPolicy, _logger),
eventsFetcher,
linkedTokenSource.Token,
out var outputtedStreamProcessor);
using var streamProcessor = outputtedStreamProcessor;
await streamProcessor.Initialize().ConfigureAwait(false);
tasks.Add(Task.Run(async() =>
{
await reverseCallClient.Handle(
(request, cancellationToken) => HandleConsumerRequest(subscriptionId, queue, request, cancellationToken),
linkedTokenSource.Token).ConfigureAwait(false);
linkedTokenSource.Cancel();
}));
tasks.Add(streamProcessor.Start());
}
catch (Exception ex)
{
linkedTokenSource.Cancel();
_logger.Warning(ex, "Error occurred while initializing Subscription: {subscriptionId}", subscriptionId);
return;
}
var finishedTask = await Task.WhenAny(tasks).ConfigureAwait(false);
if (!linkedTokenSource.IsCancellationRequested)
{
linkedTokenSource.Cancel();
}
if (TryGetException(tasks, out var exception))
{
linkedTokenSource.Cancel();
_logger.Warning(exception, "Error occurred while processing Subscription: {subscriptionId}", subscriptionId);
}
await Task.WhenAll(tasks).ConfigureAwait(false);
}
/// <inheritdoc/>
public Task StartReceivingEventsInto(
AsyncProducerConsumerQueue <StreamEvent> connectionToStreamProcessorQueue,
CancellationToken cancellationToken)
{
return(_reverseCallClient.Handle(
(request, _, cancellationToken)
=> HandleEventFromEventHorizon(
connectionToStreamProcessorQueue,
request.Event,
cancellationToken),
cancellationToken));
}