public static ISpanBuilder BeginSpan()
{
var traceReporter = Configuration.Reporter;
if (traceReporter == null)
{
return(new FakeSpanBuilder());
}
var pooledSpan = spanPool.AcquireHandle();
var contextScope = TraceContextScope.Begin();
return(new SpanBuilder(traceReporter, pooledSpan, contextScope, configuration));
}
private async Task <HttpActionStatus> ReadResponseBodyAsync(Request request, HttpWebRequestState state)
{
try
{
var contentLength = (int)state.Response.ContentLength;
if (contentLength > 0)
{
state.BodyBuffer = new byte[contentLength];
var totalBytesRead = 0;
// (iloktionov): Если буфер размером contentLength не попадет в LOH, можно передать его напрямую для работы с сокетом.
// В противном случае лучше использовать небольшой промежуточный буфер из пула, т.к. ссылка на переданный сохранится надолго из-за Keep-Alive.
if (contentLength < lohObjectSizeThreshold)
{
while (totalBytesRead < contentLength)
{
var bytesToRead = Math.Min(contentLength - totalBytesRead, preferredReadSize);
var bytesRead = await state.ResponseStream.ReadAsync(state.BodyBuffer, totalBytesRead, bytesToRead).ConfigureAwait(false);
if (bytesRead == 0)
{
break;
}
totalBytesRead += bytesRead;
}
}
else
{
using (var bufferHandle = readBuffersPool.AcquireHandle())
{
var buffer = bufferHandle.Resource;
while (totalBytesRead < contentLength)
{
var bytesToRead = Math.Min(contentLength - totalBytesRead, buffer.Length);
var bytesRead = await state.ResponseStream.ReadAsync(buffer, 0, bytesToRead).ConfigureAwait(false);
if (bytesRead == 0)
{
break;
}
Buffer.BlockCopy(buffer, 0, state.BodyBuffer, totalBytesRead, bytesRead);
totalBytesRead += bytesRead;
}
}
}
if (totalBytesRead < contentLength)
{
throw new EndOfStreamException($"Response stream ended prematurely. Read only {totalBytesRead} byte(s), but Content-Length specified {contentLength}.");
}
}
else
{
state.BodyStream = new MemoryStream();
using (var bufferHandle = readBuffersPool.AcquireHandle())
{
var buffer = bufferHandle.Resource;
while (true)
{
var bytesRead = await state.ResponseStream.ReadAsync(buffer, 0, buffer.Length).ConfigureAwait(false);
if (bytesRead == 0)
{
break;
}
state.BodyStream.Write(buffer, 0, bytesRead);
}
}
}
return(HttpActionStatus.Success);
}
catch (Exception error)
{
if (IsCancellationException(error))
{
return(HttpActionStatus.RequestCanceled);
}
LogReceiveBodyFailure(request, error);
return(HttpActionStatus.ReceiveFailure);
}
}