private static Task WriteMessageCoreAsync(this PipeWriter pipeWriter, byte[] messageData, HttpContextServerCallContext serverCallContext, bool flush)
{
Debug.Assert(serverCallContext.ResponseGrpcEncoding != null);
var isCompressed =
serverCallContext.CanWriteCompressed() &&
!string.Equals(serverCallContext.ResponseGrpcEncoding, GrpcProtocolConstants.IdentityGrpcEncoding, StringComparison.Ordinal);
if (isCompressed)
{
messageData = GrpcProtocolHelpers.CompressMessage(
serverCallContext.ResponseGrpcEncoding,
serverCallContext.ServiceOptions.ResponseCompressionLevel,
serverCallContext.ServiceOptions.CompressionProviders,
messageData);
}
WriteHeader(pipeWriter, messageData.Length, isCompressed);
pipeWriter.Write(messageData);
if (flush)
{
serverCallContext.HasBufferedMessage = false;
return(pipeWriter.FlushAsync().GetAsTask());
}
else
{
// Set flag so buffered message will be written at the end
serverCallContext.HasBufferedMessage = true;
}
return(Task.CompletedTask);
}
private static Task WriteMessageCoreAsync(this PipeWriter pipeWriter, byte[] messageData, HttpContextServerCallContext serverCallContext, bool flush)
{
Debug.Assert(serverCallContext.ResponseGrpcEncoding != null);
var isCompressed =
serverCallContext.CanWriteCompressed() &&
!string.Equals(serverCallContext.ResponseGrpcEncoding, GrpcProtocolConstants.IdentityGrpcEncoding, StringComparison.Ordinal);
if (isCompressed)
{
messageData = GrpcProtocolHelpers.CompressMessage(
serverCallContext.ResponseGrpcEncoding,
serverCallContext.ServiceOptions.ResponseCompressionLevel,
serverCallContext.ServiceOptions.CompressionProviders,
messageData);
}
WriteHeader(pipeWriter, messageData.Length, isCompressed);
pipeWriter.Write(messageData);
if (flush)
{
var valueTask = pipeWriter.FlushAsync();
if (valueTask.IsCompletedSuccessfully)
{
// We do this to reset the underlying value task (which happens in GetResult())
valueTask.GetAwaiter().GetResult();
return(Task.CompletedTask);
}
return(valueTask.AsTask());
}
return(Task.CompletedTask);
}
public static async Task WriteMessageAsync <TResponse>(this PipeWriter pipeWriter, TResponse response, HttpContextServerCallContext serverCallContext, Action <TResponse, SerializationContext> serializer, bool canFlush)
{
var logger = serverCallContext.Logger;
try
{
Log.SendingMessage(logger);
var serializationContext = serverCallContext.SerializationContext;
serializer(response, serializationContext);
var responsePayload = serializationContext.Payload;
serializationContext.Payload = null;
if (responsePayload == null)
{
throw new InvalidOperationException("Serialization did not return a payload.");
}
Log.SerializedMessage(serverCallContext.Logger, typeof(TResponse), responsePayload.Length);
// Must call StartAsync before the first pipeWriter.GetSpan() in WriteHeader
var httpResponse = serverCallContext.HttpContext.Response;
if (!httpResponse.HasStarted)
{
await httpResponse.StartAsync();
}
var isCompressed =
serverCallContext.CanWriteCompressed() &&
!string.Equals(serverCallContext.ResponseGrpcEncoding, GrpcProtocolConstants.IdentityGrpcEncoding, StringComparison.Ordinal);
if (isCompressed)
{
responsePayload = CompressMessage(
serverCallContext.Logger,
serverCallContext.ResponseGrpcEncoding !,
serverCallContext.ServiceOptions.ResponseCompressionLevel,
serverCallContext.ServiceOptions.CompressionProviders,
responsePayload);
}
if (responsePayload.Length > serverCallContext.ServiceOptions.SendMaxMessageSize)
{
throw new RpcException(SendingMessageExceedsLimitStatus);
}
WriteHeader(pipeWriter, responsePayload.Length, isCompressed);
pipeWriter.Write(responsePayload);
// Flush messages unless WriteOptions.Flags has BufferHint set
var flush = canFlush && ((serverCallContext.WriteOptions?.Flags ?? default) & WriteFlags.BufferHint) != WriteFlags.BufferHint;
if (flush)
{
serverCallContext.HasBufferedMessage = false;
await pipeWriter.FlushAsync();
}
else
{
// Set flag so buffered message will be written at the end
serverCallContext.HasBufferedMessage = true;
}
Log.MessageSent(serverCallContext.Logger);
GrpcEventSource.Log.MessageSent();
}
catch (Exception ex)
{
Log.ErrorSendingMessage(logger, ex);
throw;
}
}