public override async Task <AppendResp> Append(
IAsyncStreamReader <AppendReq> requestStream,
ServerCallContext context)
{
if (!await requestStream.MoveNext().ConfigureAwait(false))
{
throw new InvalidOperationException();
}
if (requestStream.Current.ContentCase != AppendReq.ContentOneofCase.Options)
{
throw new InvalidOperationException();
}
var options = requestStream.Current.Options;
var streamName = options.StreamIdentifier;
var expectedVersion = options.ExpectedStreamRevisionCase switch {
AppendReq.Types.Options.ExpectedStreamRevisionOneofCase.Revision => new StreamRevision(
options.Revision).ToInt64(),
AppendReq.Types.Options.ExpectedStreamRevisionOneofCase.Any => AnyStreamRevision.Any.ToInt64(),
AppendReq.Types.Options.ExpectedStreamRevisionOneofCase.StreamExists => AnyStreamRevision.StreamExists.ToInt64(),
AppendReq.Types.Options.ExpectedStreamRevisionOneofCase.NoStream => AnyStreamRevision.NoStream.ToInt64(),
_ => throw new InvalidOperationException()
};
var requiresLeader = GetRequiresLeader(context.RequestHeaders);
var user = context.GetHttpContext().User;
var op = WriteOperation.WithParameter(Plugins.Authorization.Operations.Streams.Parameters.StreamId(streamName));
if (!await _provider.CheckAccessAsync(user, op, context.CancellationToken).ConfigureAwait(false))
{
throw AccessDenied();
}
var correlationId = Guid.NewGuid(); // TODO: JPB use request id?
var events = new List <Event>();
var size = 0;
while (await requestStream.MoveNext().ConfigureAwait(false))
{
if (requestStream.Current.ContentCase != AppendReq.ContentOneofCase.ProposedMessage)
{
throw new InvalidOperationException();
}
var proposedMessage = requestStream.Current.ProposedMessage;
var data = proposedMessage.Data.ToByteArray();
var metadata = proposedMessage.CustomMetadata.ToByteArray();
if (!proposedMessage.Metadata.TryGetValue(Constants.Metadata.Type, out var eventType))
{
throw RpcExceptions.RequiredMetadataPropertyMissing(Constants.Metadata.Type);
}
if (!proposedMessage.Metadata.TryGetValue(Constants.Metadata.ContentType, out var contentType))
{
throw RpcExceptions.RequiredMetadataPropertyMissing(Constants.Metadata.ContentType);
}
size += Event.SizeOnDisk(eventType, data, metadata);
if (size > _maxAppendSize)
{
throw RpcExceptions.MaxAppendSizeExceeded(_maxAppendSize);
}
events.Add(new Event(
Uuid.FromDto(proposedMessage.Id).ToGuid(),
eventType,
contentType == Constants.Metadata.ContentTypes.ApplicationJson,
data,
metadata));
}
var appendResponseSource = new TaskCompletionSource <AppendResp>();
var envelope = new CallbackEnvelope(HandleWriteEventsCompleted);
_publisher.Publish(new ClientMessage.WriteEvents(
correlationId,
correlationId,
envelope,
requiresLeader,
streamName,
expectedVersion,
events.ToArray(),
user,
cancellationToken: context.CancellationToken));
return(await appendResponseSource.Task.ConfigureAwait(false));
void HandleWriteEventsCompleted(Message message)
{
if (message is ClientMessage.NotHandled notHandled && RpcExceptions.TryHandleNotHandled(notHandled, out var ex))
{
appendResponseSource.TrySetException(ex);
return;
}
if (!(message is ClientMessage.WriteEventsCompleted completed))
{
appendResponseSource.TrySetException(
RpcExceptions.UnknownMessage <ClientMessage.WriteEventsCompleted>(message));
return;
}
var response = new AppendResp();
switch (completed.Result)
{
case OperationResult.Success:
response.Success = new AppendResp.Types.Success();
if (completed.LastEventNumber == -1)
{
response.Success.NoStream = new Empty();
}
else
{
response.Success.CurrentRevision = StreamRevision.FromInt64(completed.LastEventNumber);
}
if (completed.CommitPosition == -1)
{
response.Success.NoPosition = new Empty();
}
else
{
var position = Position.FromInt64(completed.CommitPosition, completed.PreparePosition);
response.Success.Position = new AppendResp.Types.Position {
CommitPosition = position.CommitPosition,
PreparePosition = position.PreparePosition
};
}
appendResponseSource.TrySetResult(response);
return;
case OperationResult.PrepareTimeout:
case OperationResult.CommitTimeout:
case OperationResult.ForwardTimeout:
appendResponseSource.TrySetException(RpcExceptions.Timeout());
return;
case OperationResult.WrongExpectedVersion:
response.WrongExpectedVersion = new AppendResp.Types.WrongExpectedVersion();
switch (options.ExpectedStreamRevisionCase)
{
case AppendReq.Types.Options.ExpectedStreamRevisionOneofCase.Any:
response.WrongExpectedVersion.ExpectedAny = new Empty();
response.WrongExpectedVersion.Any2060 = new Empty();
break;
case AppendReq.Types.Options.ExpectedStreamRevisionOneofCase.StreamExists:
response.WrongExpectedVersion.ExpectedStreamExists = new Empty();
response.WrongExpectedVersion.StreamExists2060 = new Empty();
break;
case AppendReq.Types.Options.ExpectedStreamRevisionOneofCase.NoStream:
response.WrongExpectedVersion.ExpectedNoStream = new Empty();
response.WrongExpectedVersion.ExpectedRevision2060 = ulong.MaxValue;
break;
case AppendReq.Types.Options.ExpectedStreamRevisionOneofCase.Revision:
response.WrongExpectedVersion.ExpectedRevision =
StreamRevision.FromInt64(expectedVersion);
response.WrongExpectedVersion.ExpectedRevision2060 =
StreamRevision.FromInt64(expectedVersion);
break;
}
if (completed.CurrentVersion == -1)
{
response.WrongExpectedVersion.CurrentNoStream = new Empty();
response.WrongExpectedVersion.NoStream2060 = new Empty();
}
else
{
response.WrongExpectedVersion.CurrentRevision =
StreamRevision.FromInt64(completed.CurrentVersion);
response.WrongExpectedVersion.CurrentRevision2060 =
StreamRevision.FromInt64(completed.CurrentVersion);
}
appendResponseSource.TrySetResult(response);
return;
case OperationResult.StreamDeleted:
appendResponseSource.TrySetException(RpcExceptions.StreamDeleted(streamName));
return;
case OperationResult.InvalidTransaction:
appendResponseSource.TrySetException(RpcExceptions.InvalidTransaction());
return;
case OperationResult.AccessDenied:
appendResponseSource.TrySetException(RpcExceptions.AccessDenied());
return;
default:
appendResponseSource.TrySetException(RpcExceptions.UnknownError(completed.Result));
return;
}
}
}
}
private async Task Receive(ChannelWriter <BatchAppendResp> writer, ClaimsPrincipal user, bool requiresLeader,
CancellationToken cancellationToken)
{
var pendingWrites = new ConcurrentDictionary <Guid, ClientWriteRequest>();
try {
await foreach (var request in _requestStream.ReadAllAsync(cancellationToken))
{
try {
var correlationId = Uuid.FromDto(request.CorrelationId).ToGuid();
if (request.Options != null)
{
TimeSpan timeout = Min(GetRequestedTimeout(request.Options), _writeTimeout);
if (!await _authorizationProvider.CheckAccessAsync(user, WriteOperation.WithParameter(
Plugins.Authorization.Operations.Streams.Parameters.StreamId(
request.Options.StreamIdentifier)), cancellationToken).ConfigureAwait(false))
{
await writer.WriteAsync(new BatchAppendResp {
CorrelationId = request.CorrelationId,
StreamIdentifier = request.Options.StreamIdentifier,
Error = Status.AccessDenied
}, cancellationToken).ConfigureAwait(false);
continue;
}
if (request.Options.StreamIdentifier == null)
{
await writer.WriteAsync(new BatchAppendResp {
CorrelationId = request.CorrelationId,
StreamIdentifier = request.Options.StreamIdentifier,
Error = Status.BadRequest(
$"Required field {nameof(request.Options.StreamIdentifier)} not set.")
}, cancellationToken).ConfigureAwait(false);
continue;
}
if (Max(timeout, TimeSpan.Zero) == TimeSpan.Zero)
{
await writer.WriteAsync(new BatchAppendResp {
CorrelationId = request.CorrelationId,
StreamIdentifier = request.Options.StreamIdentifier,
Error = Status.Timeout
}, cancellationToken).ConfigureAwait(false);
continue;
}
pendingWrites.AddOrUpdate(correlationId,
c => FromOptions(c, request.Options, timeout, cancellationToken),
(_, writeRequest) => writeRequest);
}
if (!pendingWrites.TryGetValue(correlationId, out var clientWriteRequest))
{
continue;
}
clientWriteRequest.AddEvents(request.ProposedMessages.Select(FromProposedMessage));
if (clientWriteRequest.Size > _maxAppendSize)
{
pendingWrites.TryRemove(correlationId, out _);
await writer.WriteAsync(new BatchAppendResp {
CorrelationId = request.CorrelationId,
StreamIdentifier = clientWriteRequest.StreamId,
Error = Status.MaximumAppendSizeExceeded((uint)_maxAppendSize)
}, cancellationToken).ConfigureAwait(false);
}
if (!request.IsFinal)
{
continue;
}
if (!pendingWrites.TryRemove(correlationId, out _))
{
continue;
}
Interlocked.Increment(ref _pending);
_publisher.Publish(ToInternalMessage(clientWriteRequest, new CallbackEnvelope(message => {
try {
writer.TryWrite(ConvertMessage(message));
} catch (Exception ex) {
writer.TryComplete(ex);
}
}), requiresLeader, user, cancellationToken));
BatchAppendResp ConvertMessage(Message message)
{
var batchAppendResp = message switch {
ClientMessage.NotHandled notHandled => new BatchAppendResp {
Error = new Status {
Details = Any.Pack(new Empty()),
Message = (notHandled.Reason, notHandled.AdditionalInfo) switch {
(NotHandledReason.NotReady, _) => "Server Is Not Ready",
(NotHandledReason.TooBusy, _) => "Server Is Busy",
(NotHandledReason.NotLeader or NotHandledReason.IsReadOnly,
LeaderInfo leaderInfo) =>
throw RpcExceptions.LeaderInfo(leaderInfo.HttpAddress,
leaderInfo.HttpPort),
(NotHandledReason.NotLeader or NotHandledReason.IsReadOnly, _) =>
"No leader info available in response",
_ => $"Unknown {nameof(NotHandledReason)} ({(int)notHandled.Reason})"
}
}
},
ClientMessage.WriteEventsCompleted completed => completed.Result switch {
OperationResult.Success => new BatchAppendResp {
Success = BatchAppendResp.Types.Success.Completed(completed.CommitPosition,
completed.PreparePosition, completed.LastEventNumber),
},
OperationResult.WrongExpectedVersion => new BatchAppendResp {
Error = Status.WrongExpectedVersion(
StreamRevision.FromInt64(completed.CurrentVersion),
clientWriteRequest.ExpectedVersion)
},
OperationResult.AccessDenied => new BatchAppendResp
{
Error = Status.AccessDenied
},
OperationResult.StreamDeleted => new BatchAppendResp {
Error = Status.StreamDeleted(clientWriteRequest.StreamId)
},
OperationResult.CommitTimeout or
OperationResult.ForwardTimeout or
OperationResult.PrepareTimeout => new BatchAppendResp
{
Error = Status.Timeout
},
_ => new BatchAppendResp {
Error = Status.Unknown
}
},
_ => new BatchAppendResp {
Error = new Status {
Details = Any.Pack(new Empty()),
Message =
$"Envelope callback expected either {nameof(ClientMessage.WriteEventsCompleted)} or {nameof(ClientMessage.NotHandled)}, received {message.GetType().Name} instead"
}
}
};
batchAppendResp.CorrelationId = Uuid.FromGuid(correlationId).ToDto();
batchAppendResp.StreamIdentifier = new StreamIdentifier {
StreamName = ByteString.CopyFromUtf8(clientWriteRequest.StreamId)
};
return(batchAppendResp);
}
} catch (Exception ex) {
await writer.WriteAsync(new BatchAppendResp {
CorrelationId = request.CorrelationId,
StreamIdentifier = request.Options.StreamIdentifier,
Error = Status.BadRequest(ex.Message)
}, cancellationToken).ConfigureAwait(false);
}
}
