private async Task BroadcastOperationAsync(
ChangeStreamOperationType operationType,
RecordedEventDocument document
)
{
switch (operationType)
{
case ChangeStreamOperationType.Insert:
{
var recordedEvent = RecordedEvent.FromDocument(document);
Console.WriteLine("Broadcasting insert:");
Console.WriteLine(Encoding.UTF8.GetString(recordedEvent.Data));
await _hub.Clients.All.EventRecorded(recordedEvent);
break;
}
case ChangeStreamOperationType.Update:
case ChangeStreamOperationType.Replace:
case ChangeStreamOperationType.Delete:
case ChangeStreamOperationType.Invalidate:
case ChangeStreamOperationType.Rename:
case ChangeStreamOperationType.Drop:
break;
default:
throw new ArgumentOutOfRangeException(nameof(operationType), operationType, null);
}
}
public static RecordedEvent FromDocument(RecordedEventDocument document)
{
var recordedEvent = new RecordedEvent(
document.Id,
document.Stream,
document.EventId,
document.EventType,
document.EventNumber,
document.Created,
document.Data,
document.Metadata
);
return(recordedEvent);
}
public async Task <IActionResult> AppendEventAsync(
string name,
[FromBody] AppendEventRequest request,
CancellationToken cancellationToken
)
{
var latestEvent = await _events
.Find(e => e.Stream == name)
.SortByDescending(e => e.EventNumber)
.FirstOrDefaultAsync(cancellationToken);
var document = new RecordedEventDocument
{
Stream = name,
EventId = request.EventId,
EventType = request.EventType,
EventNumber = (latestEvent?.EventNumber ?? -1L) + 1L,
Created = _clock.UtcNow.UtcDateTime,
Data = request.Data,
Metadata = request.Metadata
};
try
{
await _events.InsertOneAsync(document, null, cancellationToken);
}
catch (MongoWriteException ex)
{
if (ex.WriteError.Category == ServerErrorCategory.DuplicateKey)
{
return(Conflict());
}
throw;
}
return(Ok());
}
