public async Task <AppendEventsResult> AppendEvents(
StreamName stream,
ExpectedStreamVersion expectedVersion,
IReadOnlyCollection <StreamEvent> events,
CancellationToken cancellationToken
)
{
var streamName = stream.ToString();
var documents = events.Select(AsDocument).ToArray();
var bulk = new BulkDescriptor(_options.IndexName).CreateMany(documents).Refresh(Refresh.WaitFor);
var result = await _client.BulkAsync(bulk, cancellationToken);
return(result.IsValid
? new AppendEventsResult(0, documents.Last().StreamPosition + 1)
: throw new ApplicationException($"Unable to add events: {result.DebugInformation}"));
PersistedEvent AsDocument(StreamEvent evt)
=> new(
evt.Id.ToString(),
TypeMap.Instance.GetTypeName(evt.Payload !),
evt.Position + 1,
evt.ContentType,
streamName,
(ulong)evt.Position + 1,
evt.Payload,
evt.Metadata.ToHeaders(),
DateTime.Now
);
}
public Task TruncateStream(
StreamName stream,
StreamTruncatePosition truncatePosition,
ExpectedStreamVersion expectedVersion,
CancellationToken cancellationToken
)
{
var meta = new StreamMetadata(truncateBefore: truncatePosition.AsStreamPosition());
return(TryExecute(
() => AnyOrNot(
expectedVersion,
() => _client.SetStreamMetadataAsync(
stream,
StreamState.Any,
meta,
cancellationToken: cancellationToken
),
() => _client.SetStreamMetadataAsync(
stream,
expectedVersion.AsStreamRevision(),
meta,
cancellationToken: cancellationToken
)
),
stream,
() => new ErrorInfo(
"Unable to truncate stream {Stream} at {Position}",
stream,
truncatePosition
),
(s, ex) => new TruncateStreamException(s, ex)
));
}
public async Task Store <T>(T aggregate)
where T : Aggregate
{
Ensure.NotNull(aggregate, nameof(aggregate));
if (aggregate.Changes.Count == 0)
{
return;
}
var stream = StreamName.For <T>(aggregate.GetId());
var expectedVersion = new ExpectedStreamVersion(aggregate.OriginalVersion);
await _eventStore.AppendEvents(stream, expectedVersion, aggregate.Changes.Select(ToStreamEvent).ToArray());
StreamEvent ToStreamEvent(object evt)
=> new(TypeMap.GetTypeName(evt), _serializer.Serialize(evt), null, _serializer.ContentType);
}
public static async Task <AppendEventsResult> Store <T>(
this IEventWriter eventWriter,
StreamName streamName,
T aggregate,
Func <StreamEvent, StreamEvent> amendEvent,
CancellationToken cancellationToken
) where T : Aggregate
{
Ensure.NotNull(aggregate);
if (aggregate.Changes.Count == 0)
{
return(AppendEventsResult.NoOp);
}
var originalVersion = aggregate.OriginalVersion;
var expectedVersion = new ExpectedStreamVersion(originalVersion);
try {
var result = await eventWriter.AppendEvents(
streamName,
expectedVersion,
aggregate.Changes.Select((o, i) => ToStreamEvent(o, i + originalVersion)).ToArray(),
cancellationToken
)
.NoContext();
return(result);
}
catch (Exception e) {
Log.UnableToStoreAggregate(aggregate, e);
throw e.InnerException?.Message.Contains("WrongExpectedVersion") == true
? new OptimisticConcurrencyException <T>(aggregate, e) : e;
}
StreamEvent ToStreamEvent(object evt, int position)
{
var streamEvent = new StreamEvent(Guid.NewGuid(), evt, new Metadata(), "", position);
return(amendEvent(streamEvent));
}
}
public async Task Store <T>(T aggregate)
where T : Aggregate
{
if (aggregate == null)
{
throw new ArgumentNullException(nameof(aggregate));
}
if (aggregate.Changes.Count == 0)
{
return;
}
var stream = StreamName.For <T>(aggregate.GetId());
var expectedVersion = new ExpectedStreamVersion(aggregate.Version);
await _eventStore.AppendEvents(stream, expectedVersion, aggregate.Changes.Select(ToStreamEvent).ToArray());
JsonStreamEvent ToStreamEvent(object evt)
=> new(TypeMap.GetTypeName(evt), _serializer.Serialize(evt));
}
public Task DeleteStream(
StreamName stream,
ExpectedStreamVersion expectedVersion,
CancellationToken cancellationToken
) => TryExecute(
() => AnyOrNot(
expectedVersion,
() => _client.DeleteAsync(
stream,
StreamState.Any,
cancellationToken: cancellationToken
),
() => _client.DeleteAsync(
stream,
expectedVersion.AsStreamRevision(),
cancellationToken: cancellationToken
)
),
stream,
() => new ErrorInfo("Unable to delete stream {Stream}", stream),
(s, ex) => new DeleteStreamException(s, ex)
);
public static StreamRevision AsStreamRevision(this ExpectedStreamVersion version) => StreamRevision.FromInt64(version.Value);
public Task <AppendEventsResult> AppendEvents(
StreamName stream,
ExpectedStreamVersion expectedVersion,
IReadOnlyCollection <StreamEvent> events,
CancellationToken cancellationToken
)
{
var proposedEvents = events.Select(ToEventData);
var resultTask = expectedVersion == ExpectedStreamVersion.NoStream
? _client.AppendToStreamAsync(
stream,
StreamState.NoStream,
proposedEvents,
cancellationToken: cancellationToken
) : AnyOrNot(
expectedVersion,
() => _client.AppendToStreamAsync(
stream,
StreamState.Any,
proposedEvents,
cancellationToken: cancellationToken
),
() => _client.AppendToStreamAsync(
stream,
expectedVersion.AsStreamRevision(),
proposedEvents,
cancellationToken: cancellationToken
)
);
return(TryExecute(
async() => {
var result = await resultTask.NoContext();
return new AppendEventsResult(
result.LogPosition.CommitPosition,
result.NextExpectedStreamRevision.ToInt64()
);
},
stream,
() => new ErrorInfo("Unable to appends events to {Stream}", stream),
(s, ex) => {
EventuousEventSource.Log.UnableToAppendEvents(stream, ex);
return new AppendToStreamException(s, ex);
}
));
EventData ToEventData(StreamEvent streamEvent)
{
var(eventType, contentType, payload) = _serializer.SerializeEvent(streamEvent.Payload !);
return(new EventData(
Uuid.FromGuid(streamEvent.Id),
eventType,
payload,
_metaSerializer.Serialize(streamEvent.Metadata),
contentType
));
}
}
static Task <T> AnyOrNot <T>(
ExpectedStreamVersion version,
Func <Task <T> > whenAny,
Func <Task <T> > otherwise
)
=> version == ExpectedStreamVersion.Any ? whenAny() : otherwise();
public Task <AppendEventsResult> AppendEvents(
StreamName stream,
ExpectedStreamVersion expectedVersion,
IReadOnlyCollection <StreamEvent> events,
CancellationToken cancellationToken
) => default !;
public Task DeleteStream(
StreamName stream,
ExpectedStreamVersion expectedVersion,
CancellationToken cancellationToken
) => default !;
public Task TruncateStream(
StreamName stream,
StreamTruncatePosition truncatePosition,
ExpectedStreamVersion expectedVersion,
CancellationToken cancellationToken
) => default !;