private ICompressionProvider?ResolveCompressionProvider()
{
if (_serverCallContext.ResponseGrpcEncoding != null &&
GrpcProtocolHelpers.CanWriteCompressed(_serverCallContext.WriteOptions) &&
_serverCallContext.Options.CompressionProviders.TryGetValue(_serverCallContext.ResponseGrpcEncoding, out var compressionProvider))
{
return(compressionProvider);
}
return(null);
}
private ICompressionProvider?ResolveCompressionProvider()
{
Debug.Assert(
_serverCallContext.ResponseGrpcEncoding != null,
"Response encoding should have been calculated at this point.");
var canCompress =
GrpcProtocolHelpers.CanWriteCompressed(_serverCallContext.WriteOptions) &&
!string.Equals(_serverCallContext.ResponseGrpcEncoding, GrpcProtocolConstants.IdentityGrpcEncoding, StringComparison.Ordinal);
if (canCompress)
{
if (_serverCallContext.Options.CompressionProviders.TryGetValue(_serverCallContext.ResponseGrpcEncoding, out var compressionProvider))
{
return(compressionProvider);
}
}
return(null);
}
public static async Task WriteMessageAsync <TResponse>(this PipeWriter pipeWriter, TResponse response, HttpContextServerCallContext serverCallContext, Action <TResponse, SerializationContext> serializer, bool canFlush)
where TResponse : class
{
var logger = serverCallContext.Logger;
try
{
GrpcServerLog.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.");
}
GrpcServerLog.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 canCompress =
GrpcProtocolHelpers.CanWriteCompressed(serverCallContext.WriteOptions) &&
!string.Equals(serverCallContext.ResponseGrpcEncoding, GrpcProtocolConstants.IdentityGrpcEncoding, StringComparison.Ordinal);
var isCompressed = false;
if (canCompress)
{
Debug.Assert(
serverCallContext.ServiceOptions.ResolvedCompressionProviders != null,
"Compression providers should have been resolved for service.");
if (TryCompressMessage(
serverCallContext.Logger,
serverCallContext.ResponseGrpcEncoding !,
serverCallContext.ServiceOptions.ResponseCompressionLevel,
serverCallContext.ServiceOptions.ResolvedCompressionProviders,
responsePayload,
out var result))
{
responsePayload = result;
isCompressed = true;
}
}
if (responsePayload.Length > serverCallContext.ServiceOptions.MaxSendMessageSize)
{
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;
}
GrpcServerLog.MessageSent(serverCallContext.Logger);
GrpcEventSource.Log.MessageSent();
}
catch (Exception ex)
{
GrpcServerLog.ErrorSendingMessage(logger, ex);
throw;
}
}
