private static void IOCompleted(ResponseStreamAsyncResult asyncResult, uint errorCode, uint numBytes)
{
try
{
if (errorCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS && errorCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_HANDLE_EOF)
{
asyncResult.Fail(new IOException(string.Empty, new WebListenerException((int)errorCode)));
}
else
{
if (asyncResult._dataChunks == null)
{
// TODO: Verbose log data written
}
else
{
// TODO: Verbose log
// for (int i = 0; i < asyncResult._dataChunks.Length; i++)
// {
// Logging.Dump(Logging.HttpListener, asyncResult, "Callback", (IntPtr)asyncResult._dataChunks[0].fromMemory.pBuffer, (int)asyncResult._dataChunks[0].fromMemory.BufferLength);
// }
}
asyncResult.Complete();
}
}
catch (Exception e)
{
asyncResult.Fail(e);
}
}
internal unsafe void CancelLastWrite(SafeHandle requestQueueHandle)
{
ResponseStreamAsyncResult asyncState = _lastWrite;
if (asyncState != null && !asyncState.IsCompleted)
{
UnsafeNclNativeMethods.CancelIoEx(requestQueueHandle, asyncState.NativeOverlapped);
}
}
/*
* 12.3
* HttpSendHttpResponse() and HttpSendResponseEntityBody() Flag Values.
* The following flags can be used on calls to HttpSendHttpResponse() and HttpSendResponseEntityBody() API calls:
*
#define HTTP_SEND_RESPONSE_FLAG_DISCONNECT 0x00000001
#define HTTP_SEND_RESPONSE_FLAG_MORE_DATA 0x00000002
#define HTTP_SEND_RESPONSE_FLAG_RAW_HEADER 0x00000004
#define HTTP_SEND_RESPONSE_FLAG_VALID 0x00000007
*
* HTTP_SEND_RESPONSE_FLAG_DISCONNECT:
* specifies that the network connection should be disconnected immediately after
* sending the response, overriding the HTTP protocol's persistent connection features.
* HTTP_SEND_RESPONSE_FLAG_MORE_DATA:
* specifies that additional entity body data will be sent by the caller. Thus,
* the last call HttpSendResponseEntityBody for a RequestId, will have this flag reset.
* HTTP_SEND_RESPONSE_RAW_HEADER:
* specifies that a caller of HttpSendResponseEntityBody() is intentionally omitting
* a call to HttpSendHttpResponse() in order to bypass normal header processing. The
* actual HTTP header will be generated by the application and sent as entity body.
* This flag should be passed on the first call to HttpSendResponseEntityBody, and
* not after. Thus, flag is not applicable to HttpSendHttpResponse.
*/
// TODO: Consider using HTTP_SEND_RESPONSE_RAW_HEADER with HttpSendResponseEntityBody instead of calling HttpSendHttpResponse.
// This will give us more control of the bytes that hit the wire, including encodings, HTTP 1.0, etc..
// It may also be faster to do this work in managed code and then pass down only one buffer.
// What would we loose by bypassing HttpSendHttpResponse?
//
// TODO: Consider using the HTTP_SEND_RESPONSE_FLAG_BUFFER_DATA flag for most/all responses rather than just Opaque.
internal unsafe uint SendHeaders(HttpApi.HTTP_DATA_CHUNK[] dataChunks,
ResponseStreamAsyncResult asyncResult,
HttpApi.HTTP_FLAGS flags,
bool isOpaqueUpgrade)
{
Debug.Assert(!HasStartedSending, "HttpListenerResponse::SendHeaders()|SentHeaders is true.");
_responseState = ResponseState.StartedSending;
var reasonPhrase = GetReasonPhrase(StatusCode);
/*
* if (m_BoundaryType==BoundaryType.Raw) {
* use HTTP_SEND_RESPONSE_FLAG_RAW_HEADER;
* }
*/
uint statusCode;
uint bytesSent;
List <GCHandle> pinnedHeaders = SerializeHeaders(isOpaqueUpgrade);
try
{
if (dataChunks != null)
{
if (pinnedHeaders == null)
{
pinnedHeaders = new List <GCHandle>();
}
var handle = GCHandle.Alloc(dataChunks, GCHandleType.Pinned);
pinnedHeaders.Add(handle);
_nativeResponse.Response_V1.EntityChunkCount = (ushort)dataChunks.Length;
_nativeResponse.Response_V1.pEntityChunks = (HttpApi.HTTP_DATA_CHUNK *)handle.AddrOfPinnedObject();
}
else if (asyncResult != null && asyncResult.DataChunks != null)
{
_nativeResponse.Response_V1.EntityChunkCount = asyncResult.DataChunkCount;
_nativeResponse.Response_V1.pEntityChunks = asyncResult.DataChunks;
}
else
{
_nativeResponse.Response_V1.EntityChunkCount = 0;
_nativeResponse.Response_V1.pEntityChunks = null;
}
var cachePolicy = new HttpApi.HTTP_CACHE_POLICY();
var cacheTtl = CacheTtl;
if (cacheTtl.HasValue && cacheTtl.Value > TimeSpan.Zero)
{
cachePolicy.Policy = HttpApi.HTTP_CACHE_POLICY_TYPE.HttpCachePolicyTimeToLive;
cachePolicy.SecondsToLive = (uint)Math.Min(cacheTtl.Value.Ticks / TimeSpan.TicksPerSecond, Int32.MaxValue);
}
byte[] reasonPhraseBytes = HeaderEncoding.GetBytes(reasonPhrase);
fixed(byte *pReasonPhrase = reasonPhraseBytes)
{
_nativeResponse.Response_V1.ReasonLength = (ushort)reasonPhraseBytes.Length;
_nativeResponse.Response_V1.pReason = (sbyte *)pReasonPhrase;
fixed(HttpApi.HTTP_RESPONSE_V2 *pResponse = &_nativeResponse)
{
statusCode =
HttpApi.HttpSendHttpResponse(
RequestContext.RequestQueueHandle,
Request.RequestId,
(uint)flags,
pResponse,
&cachePolicy,
&bytesSent,
SafeLocalFree.Zero,
0,
asyncResult == null ? SafeNativeOverlapped.Zero : asyncResult.NativeOverlapped,
IntPtr.Zero);
if (asyncResult != null &&
statusCode == ErrorCodes.ERROR_SUCCESS &&
WebListener.SkipIOCPCallbackOnSuccess)
{
asyncResult.BytesSent = bytesSent;
// The caller will invoke IOCompleted
}
}
}
}
finally
{
FreePinnedHeaders(pinnedHeaders);
}
return(statusCode);
}
internal unsafe Task SendFileAsyncCore(string fileName, long offset, long?count, CancellationToken cancellationToken)
{
_requestContext.Response.Start();
UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS flags = ComputeLeftToWrite();
if (count == 0 && _leftToWrite != 0)
{
return(Helpers.CompletedTask());
}
if (_leftToWrite >= 0 && count > _leftToWrite)
{
throw new InvalidOperationException(Resources.Exception_TooMuchWritten);
}
// TODO: Verbose log
if (cancellationToken.IsCancellationRequested)
{
return(Helpers.CanceledTask <int>());
}
var cancellationRegistration = default(CancellationTokenRegistration);
if (cancellationToken.CanBeCanceled)
{
cancellationRegistration = cancellationToken.Register(RequestContext.AbortDelegate, _requestContext);
}
uint statusCode;
uint bytesSent = 0;
bool startedSending = _requestContext.Response.HasStartedSending;
var chunked = _requestContext.Response.BoundaryType == BoundaryType.Chunked;
ResponseStreamAsyncResult asyncResult = new ResponseStreamAsyncResult(this, fileName, offset, count, chunked, cancellationRegistration);
long bytesWritten;
if (chunked)
{
bytesWritten = 0;
}
else if (count.HasValue)
{
bytesWritten = count.Value;
}
else
{
bytesWritten = asyncResult.FileLength - offset;
}
// Update _leftToWrite now so we can queue up additional calls to SendFileAsync.
flags |= _leftToWrite == bytesWritten ? HttpApi.HTTP_FLAGS.NONE : HttpApi.HTTP_FLAGS.HTTP_SEND_RESPONSE_FLAG_MORE_DATA;
UpdateWritenCount((uint)bytesWritten);
try
{
if (!startedSending)
{
statusCode = _requestContext.Response.SendHeaders(null, asyncResult, flags, false);
bytesSent = asyncResult.BytesSent;
}
else
{
// TODO: If opaque then include the buffer data flag.
statusCode = HttpApi.HttpSendResponseEntityBody(
_requestContext.RequestQueueHandle,
_requestContext.RequestId,
(uint)flags,
asyncResult.DataChunkCount,
asyncResult.DataChunks,
&bytesSent,
SafeLocalFree.Zero,
0,
asyncResult.NativeOverlapped,
IntPtr.Zero);
}
}
catch (Exception e)
{
LogHelper.LogException(_requestContext.Logger, "SendFileAsync", e);
asyncResult.Dispose();
Abort();
throw;
}
if (statusCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS && statusCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_IO_PENDING)
{
asyncResult.Dispose();
if (_requestContext.Server.IgnoreWriteExceptions && startedSending)
{
asyncResult.Complete();
}
else
{
Exception exception = new IOException(string.Empty, new WebListenerException((int)statusCode));
LogHelper.LogException(_requestContext.Logger, "SendFileAsync", exception);
Abort();
throw exception;
}
}
if (statusCode == ErrorCodes.ERROR_SUCCESS && WebListener.SkipIOCPCallbackOnSuccess)
{
// IO operation completed synchronously - callback won't be called to signal completion.
asyncResult.IOCompleted(statusCode, bytesSent);
}
// Last write, cache it for special cancellation handling.
if ((flags & HttpApi.HTTP_FLAGS.HTTP_SEND_RESPONSE_FLAG_MORE_DATA) == 0)
{
_lastWrite = asyncResult;
}
return(asyncResult.Task);
}
// Simpler than Flush because it will never be called at the end of the request from Dispose.
public unsafe override Task FlushAsync(CancellationToken cancellationToken)
{
if (_closed)
{
return(Helpers.CompletedTask());
}
bool startedSending = _requestContext.Response.HasStartedSending;
var byteCount = _buffer.TotalBytes;
if (byteCount == 0 && startedSending)
{
// Empty flush
return(Helpers.CompletedTask());
}
var cancellationRegistration = default(CancellationTokenRegistration);
if (cancellationToken.CanBeCanceled)
{
cancellationRegistration = cancellationToken.Register(RequestContext.AbortDelegate, _requestContext);
}
var flags = ComputeLeftToWrite();
if (_leftToWrite != byteCount)
{
flags |= HttpApi.HTTP_FLAGS.HTTP_SEND_RESPONSE_FLAG_MORE_DATA;
}
UpdateWritenCount((uint)byteCount);
uint statusCode = 0;
var chunked = _requestContext.Response.BoundaryType == BoundaryType.Chunked;
var asyncResult = new ResponseStreamAsyncResult(this, _buffer, chunked, cancellationRegistration);
uint bytesSent = 0;
try
{
if (!startedSending)
{
statusCode = _requestContext.Response.SendHeaders(null, asyncResult, flags, false);
bytesSent = asyncResult.BytesSent;
}
else
{
statusCode = HttpApi.HttpSendResponseEntityBody(
_requestContext.RequestQueueHandle,
_requestContext.RequestId,
(uint)flags,
asyncResult.DataChunkCount,
asyncResult.DataChunks,
&bytesSent,
SafeLocalFree.Zero,
0,
asyncResult.NativeOverlapped,
IntPtr.Zero);
}
}
catch (Exception e)
{
LogHelper.LogException(_requestContext.Logger, "FlushAsync", e);
asyncResult.Dispose();
Abort();
throw;
}
if (statusCode != ErrorCodes.ERROR_SUCCESS && statusCode != ErrorCodes.ERROR_IO_PENDING)
{
asyncResult.Dispose();
if (_requestContext.Server.IgnoreWriteExceptions && startedSending)
{
asyncResult.Complete();
}
else
{
Exception exception = new IOException(string.Empty, new WebListenerException((int)statusCode));
LogHelper.LogException(_requestContext.Logger, "FlushAsync", exception);
Abort();
throw exception;
}
}
if (statusCode == ErrorCodes.ERROR_SUCCESS && WebListener.SkipIOCPCallbackOnSuccess)
{
// IO operation completed synchronously - callback won't be called to signal completion.
asyncResult.IOCompleted(statusCode, bytesSent);
}
// Last write, cache it for special cancellation handling.
if ((flags & HttpApi.HTTP_FLAGS.HTTP_SEND_RESPONSE_FLAG_MORE_DATA) == 0)
{
_lastWrite = asyncResult;
}
return(asyncResult.Task);
}