public int PeekRead(IByteBuffer buffer)
{
buffer.Clear();
ArraySegment <byte> segment = buffer.ToSegment(true);
return(buffer.End = _socket.Peek(segment.Array, segment.Offset, segment.Count) + buffer.Start);
}
/*
* Resets the state of this transport so it can be used to write more messages
*/
public void ResetOutputBuffer()
{
int shrunkenSize = ShrinkBufferSize();
if (_outputBuffer.WriterIndex < shrunkenSize)
{
// Less than the shrunken size of the buffer was actually used, so increment
// the under-use counter
++_bufferUnderUsedCounter;
}
else
{
// More than the shrunken size of the buffer was actually used, reset
// the counter so we won't shrink the buffer soon
_bufferUnderUsedCounter = 0;
}
if (ShouldShrinkBuffer())
{
if ((_outputBuffer?.ReferenceCount ?? 0) > 0)
{
_outputBuffer?.Release();
}
_outputBuffer = Unpooled.Buffer(shrunkenSize);
_bufferUnderUsedCounter = 0;
}
else
{
_outputBuffer.Clear();
}
}
/// <inheritdoc/>
public void Clear(int position, int count)
{
EnsureValidPositionAndCount(position, count);
ThrowIfDisposed();
_buffer.Clear(position + _offset, count);
}
public void RegisterSocketRead(IEvent e, BufferedSocket socket, IEventHandler protocol, ReadFunction callback)
{
e.RegisterSocketRead(socket, () =>
{
EndPoint ep = new IPEndPoint(IPAddress.Any, 0);
try
{
protocol.Read(socket, _msg, ref ep);
}
catch (SocketException ex)
{
Console.WriteLine("SocketException occured: " + ex.Message);
_msg.Clear();
}
callback(_msg, ep);
});
}
private void PrepareToWrite(int count)
{
_buffer.EnsureCapacity(_position + count);
_buffer.Length = _buffer.Capacity;
if (_length < _position)
{
_buffer.Clear(_length, _position - _length);
}
}
public int ReceiveFrom(IByteBuffer message, ref IPEndPoint to)
{
message.Clear();
EndPoint ep = to;
int length = ReceiveFrom(message, ref ep);
to = (IPEndPoint)ep;
return(length);
}
public int ReceiveFrom(IByteBuffer message, ref EndPoint to)
{
message.Clear();
ArraySegment <byte> segment = message.ToSegment(true);
int length = _socket.ReceiveFrom(segment.Array, segment.Offset, segment.Count, ref to);
message.End = length;
return(length);
}
protected override void Decode(IChannelHandlerContext context, IByteBuffer input, List <object> output)
{
byte[] array = new byte[input.ReadableBytes];
input.GetBytes(input.ReaderIndex, array, 0, input.ReadableBytes);
input.Clear();
var msg = new Message();
output.Add(msg.Prase(array));
}
protected override void Decode(IChannelHandlerContext context, IByteBuffer input, List <object> output)
{
var request = new PacketRequest <IMessage>();
request.Checkbit = input.ReadInt();
request.Length = input.ReadInt();
request.CommandId = input.ReadInt();
IByteBuffer result = Unpooled.Buffer(request.Length - 4 * 3);
input.ReadBytes(result, request.Length - 4 * 3);
request.Deserialize(result.Array);
output.Add(request);
result.Clear();
}
private void PrepareToWrite(int count)
{
var minimumCapacity = (long)_position + (long)count;
if (minimumCapacity > int.MaxValue)
{
throw new IOException("Stream was too long.");
}
_buffer.EnsureCapacity((int)minimumCapacity);
_buffer.Length = _buffer.Capacity;
if (_length < _position)
{
_buffer.Clear(_length, _position - _length);
}
}
public static void MakeSpace(this IByteBuffer output, int length, string reason = null)
{
if (output.WritableBytes < length)
{
if (output.ReaderIndex == output.WriterIndex)
{
output.Clear();
}
else
{
output.DiscardReadBytes();
}
if (output.WritableBytes < length)
{
output.EnsureWritable(length, true);
}
}
}
public void TestDecodeLargerThanMaxHeaderListSizeUpdatesDynamicTable()
{
IByteBuffer input = Unpooled.Buffer(300);
try
{
hpackDecoder.SetMaxHeaderListSize(200);
HpackEncoder hpackEncoder = new HpackEncoder(true);
// encode headers that are slightly larger than maxHeaderListSize
IHttp2Headers toEncode = new DefaultHttp2Headers();
toEncode.Add((AsciiString)"test_1", (AsciiString)"1");
toEncode.Add((AsciiString)"test_2", (AsciiString)"2");
toEncode.Add((AsciiString)"long", (AsciiString)"A".PadRight(100, 'A')); //string.Format("{0,0100:d}", 0).Replace('0', 'A')
toEncode.Add((AsciiString)"test_3", (AsciiString)"3");
hpackEncoder.EncodeHeaders(1, input, toEncode, NeverSensitiveDetector.Instance);
// decode the headers, we should get an exception
IHttp2Headers decoded = new DefaultHttp2Headers();
Assert.Throws <HeaderListSizeException>(() => hpackDecoder.Decode(1, input, decoded, true));
// but the dynamic table should have been updated, so that later blocks
// can refer to earlier headers
input.Clear();
// 0x80, "indexed header field representation"
// index 62, the first (most recent) dynamic table entry
input.WriteByte(0x80 | 62);
IHttp2Headers decoded2 = new DefaultHttp2Headers();
hpackDecoder.Decode(1, input, decoded2, true);
IHttp2Headers golden = new DefaultHttp2Headers();
golden.Add((AsciiString)"test_3", (AsciiString)"3");
Assert.Equal(golden, decoded2);
}
finally
{
input.Release();
}
}
public void EncodeHeaders(int streamId, IHttp2Headers headers, IByteBuffer buffer)
{
try
{
// If there was a change in the table size, serialize the output from the hpackEncoder
// resulting from that change.
if (_tableSizeChangeOutput.IsReadable())
{
_ = buffer.WriteBytes(_tableSizeChangeOutput);
_ = _tableSizeChangeOutput.Clear();
}
_hpackEncoder.EncodeHeaders(streamId, buffer, headers, _sensitivityDetector);
}
catch (Http2Exception)
{
throw;
}
catch (Exception t)
{
ThrowHelper.ThrowConnectionError_FailedEncodingHeadersBlock(t);
}
}
protected override void Decode(IChannelHandlerContext context, IByteBuffer input, List <object> output)
{
//0 if (!input.HasArray) return;
var request = new PacketRequest <string>();
request.Checkbit = input.ReadInt(); //0-4
request.Length = input.ReadInt(); //4-8
request.CommandId = input.ReadInt(); //8-12
IByteBuffer result = Unpooled.Buffer(request.Length - 4 * 3);
input.ReadBytes(result, request.Length - 4 * 3);//12 - (20 - 4 * 3) 从第12个字节位置开始往后读8个字节
request.Deserialize(result.Array);
output.Add(request);
result.Clear();
//1 显式丢弃消息
//ReferenceCountUtil.Release(msg);
//2增加引用计数防止释放
//ReferenceCountUtil.retain(message)
//3 IByteBuffer.Read 读字节 IByteBuffer.Write 写字节
/*
* 4 移除可丢弃字节
* 所谓可丢弃字节就是调用read方法之后，readindex已经移动过了的区域，这段区域的字节称为可丢弃字节。
* 只有在内存十分宝贵需要清理的时候再调用这个方法，随便调用有可能会造成内存的复制，降低效率。
*/
//message.DiscardReadBytes();
//5 读取所有可读字节（移动读索引）
//while (message.IsReadable())
//{
// Console.WriteLine(message.ReadByte());
//}
}
protected override void Decode(IChannelHandlerContext context, IByteBuffer input, List <object> output)
{
if (!_suppressRead && !_handshakeFailed)
{
Exception error = null;
try
{
int readerIndex = input.ReaderIndex;
int readableBytes = input.ReadableBytes;
int handshakeLength = -1;
// Check if we have enough data to determine the record type and length.
while (readableBytes >= TlsUtils.SSL_RECORD_HEADER_LENGTH)
{
int contentType = input.GetByte(readerIndex);
// tls, but not handshake command
switch (contentType)
{
case TlsUtils.SSL_CONTENT_TYPE_CHANGE_CIPHER_SPEC:
// fall-through
case TlsUtils.SSL_CONTENT_TYPE_ALERT:
int len = TlsUtils.GetEncryptedPacketLength(input, readerIndex);
// Not an SSL/TLS packet
if (len == TlsUtils.NOT_ENCRYPTED)
{
_handshakeFailed = true;
var e = new NotSslRecordException(
"not an SSL/TLS record: " + ByteBufferUtil.HexDump(input));
_ = input.SkipBytes(input.ReadableBytes);
_ = context.FireUserEventTriggered(new SniCompletionEvent(e));
TlsUtils.NotifyHandshakeFailure(context, e, true);
throw e;
}
if (len == TlsUtils.NOT_ENOUGH_DATA)
{
// Not enough data
return;
}
// SNI can't be present in an ALERT or CHANGE_CIPHER_SPEC record, so we'll fall back and
// assume no SNI is present. Let's let the actual TLS implementation sort this out.
// Just select the default SslContext
goto SelectDefault;
case TlsUtils.SSL_CONTENT_TYPE_HANDSHAKE:
int majorVersion = input.GetByte(readerIndex + 1);
// SSLv3 or TLS
if (majorVersion == 3)
{
int packetLength = input.GetUnsignedShort(readerIndex + 3) + TlsUtils.SSL_RECORD_HEADER_LENGTH;
if (readableBytes < packetLength)
{
// client hello incomplete; try again to decode once more data is ready.
return;
}
else if (packetLength == TlsUtils.SSL_RECORD_HEADER_LENGTH)
{
goto SelectDefault;
}
int endOffset = readerIndex + packetLength;
// Let's check if we already parsed the handshake length or not.
if (handshakeLength == -1)
{
if (readerIndex + 4 > endOffset)
{
// Need more data to read HandshakeType and handshakeLength (4 bytes)
return;
}
int handshakeType = input.GetByte(readerIndex + TlsUtils.SSL_RECORD_HEADER_LENGTH);
// Check if this is a clientHello(1)
// See https://tools.ietf.org/html/rfc5246#section-7.4
if (handshakeType != 1)
{
goto SelectDefault;
}
// Read the length of the handshake as it may arrive in fragments
// See https://tools.ietf.org/html/rfc5246#section-7.4
handshakeLength = input.GetUnsignedMedium(readerIndex + TlsUtils.SSL_RECORD_HEADER_LENGTH + 1);
// Consume handshakeType and handshakeLength (this sums up as 4 bytes)
readerIndex += 4;
packetLength -= 4;
if (handshakeLength + 4 + TlsUtils.SSL_RECORD_HEADER_LENGTH <= packetLength)
{
// We have everything we need in one packet.
// Skip the record header
readerIndex += TlsUtils.SSL_RECORD_HEADER_LENGTH;
Select(context, ExtractSniHostname(input, readerIndex, readerIndex + handshakeLength));
return;
}
else
{
if (_handshakeBuffer is null)
{
_handshakeBuffer = context.Allocator.Buffer(handshakeLength);
}
else
{
// Clear the buffer so we can aggregate into it again.
_ = _handshakeBuffer.Clear();
}
}
}
// Combine the encapsulated data in one buffer but not include the SSL_RECORD_HEADER
_ = _handshakeBuffer.WriteBytes(input, readerIndex + TlsUtils.SSL_RECORD_HEADER_LENGTH,
packetLength - TlsUtils.SSL_RECORD_HEADER_LENGTH);
readerIndex += packetLength;
readableBytes -= packetLength;
if (handshakeLength <= _handshakeBuffer.ReadableBytes)
{
Select(context, ExtractSniHostname(_handshakeBuffer, 0, handshakeLength));
return;
}
}
break;
default:
//not tls, ssl or application data, do not try sni
break;
}
}
}
catch (Exception e)
{
error = e;
// unexpected encoding, ignore sni and use default
if (Logger.WarnEnabled)
{
Logger.UnexpectedClientHelloPacket(input, e);
}
}
SelectDefault:
if (_serverTlsSniSettings.DefaultServerHostName is object)
{
// Just select the default server TLS setting
Select(context, _serverTlsSniSettings.DefaultServerHostName);
}
else
{
ReleaseHandshakeBuffer();
_handshakeFailed = true;
var e = new DecoderException($"failed to get the server TLS setting {error}");
TlsUtils.NotifyHandshakeFailure(context, e, true);
throw e;
}
}
}
//패킷 완성후, 다음 데이터가 없는지 체크하는 함수.
//패킷 완성후, 다시 자기자신을 호출하여 다음 데이터가 없을때까지 계속 자기자신을 호출한다.
bool isCompleteSizePacket(int packet_size, IChannelHandlerContext ctx, IByteBuffer msg)
{
//아직 버퍼에 데이터가 충분하지 않다면 다시 되돌려서 패킷을 이어서 더 받아오게끔 하는 부분!
if (msg.ReadableBytes < packet_size + 8)
{
//정상적으로 데이터를 다 읽은것이 아니므로 아까 MarkReaderIndex로 저장했던 0값으로 readerIndex 4 -> 0로 초기화함.
msg.ResetReaderIndex();
return(false); //다시 되돌려서 패킷을 이어서 더 받아오게끔 하는 부분!
}
//패킷이 뭉쳐서 데이터를 더 받아왔을 경우! 원래 받아야 할 부분만 받고, 나머지는 다시 되돌려서 뒤이어 오는 패킷과 합쳐서 받을 것!
else if (msg.ReadableBytes > packet_size + 8)
{
//받아온 데이터.
byte[] packet_data = new byte[msg.ReadableBytes];
msg.ReadBytes(packet_data, 0, msg.ReadableBytes);
//버퍼의 현재 용량에서 추가로 기록가능한 영역이 10KB 이하라면,
//이미 읽은 분량만큼은 필요없으므로 Index 0의 위치로 데이터를 옮겨 추가로 기록가능한 영역을 늘린다.
if (msg.Capacity - msg.WriterIndex < 10000)
{
msg.DiscardReadBytes();
}
//받아온 데이터를 메인스레드와 통신하기 위한 목적으로 만들어둔 수신 Queue에 삽입.
//멀티스레드에서 공유하는 Queue이므로, Locking 처리. NetworkManager.locking 는 스레드 lock용 모니터 객체이다.
lock (NetworkManager.locking)
{
//받아온 데이터를 수신Queue에 삽입하는 부분.
//데이터 삽입.
NetworkManager.packet_Queue.Enqueue(new Packet_Data(packet_data));
}
//패킷 완성후 남은 데이터가 헤더크기인 12byte보다 작을 경우.
if (msg.ReadableBytes < 12)
{
return(false);
}
else
{
msg.MarkReaderIndex();
int amountSize = msg.ReadIntLE();
//비정상적인 데이터가 도달하였다면.
if (!isAvailablePacketSize(amountSize))
{
//연결 종료
ctx.CloseAsync(); //채널이 닫힌다면 msg는 release 된다.
return(false);
}
return(isCompleteSizePacket(amountSize, ctx, msg)); //재귀함수 처리
//패킷 완성후, 남은데이터가 없을때까지 계속 반복한다.
}
}
else //정확한 데이터일 경우. [msg.ReadableBytes > packet_size + 8] 또는 [msg.readableBytes() + 4 == packet_size + 12]
{
//받아온 데이터.
byte[] packet_data = new byte[msg.ReadableBytes];
msg.ReadBytes(packet_data, 0, msg.ReadableBytes);
//버퍼에 읽어와야 할 데이터가 남아있지 않으므로 readerIndex, writerIndex를 각각 0으로 초기화 한다.
//내부 버퍼 데이터를 변경하지 않고 index값만 변경하므로 자원을 적게 소모한다.
msg.Clear();
//받아온 데이터를 메인스레드와 통신하기 위한 목적으로 만들어둔 수신 Queue에 삽입.
//멀티스레드에서 공유하는 Queue이므로, Locking 처리. NetworkManager.locking 는 스레드 lock용 모니터 객체이다.
lock (NetworkManager.locking)
{
//받아온 데이터를 수신Queue에 삽입하는 부분.
//데이터 삽입.
NetworkManager.packet_Queue.Enqueue(new Packet_Data(packet_data));
}
//다시 되돌려서 패킷을 이어서 더 받아오게끔 하는 부분!
return(false);
}
}
/// <summary>
/// Clears the data in the buffer.
/// </summary>
public void Clear()
{
ThrowIfDisposed();
_byteBuffer.Clear();
}
public int Read(IByteBuffer buffer)
{
buffer.Clear();
ArraySegment<byte> segment = buffer.ToSegment(true);
buffer.End = _socket.Receive(segment.Array, segment.Offset, segment.Count) + buffer.Start;
return buffer.End;
}
public int ReceiveFrom(IByteBuffer message, ref EndPoint to)
{
message.Clear();
ArraySegment<byte> segment = message.ToSegment(true);
int length = _socket.ReceiveFrom(segment.Array, segment.Offset, segment.Count, ref to);
message.End = length;
return length;
}
public IByteBuffer Clear()
{
_ = Buf.Clear();
return(this);
}
public int ReceiveFrom(IByteBuffer message, ref IPEndPoint to)
{
message.Clear();
EndPoint ep = to;
int length = ReceiveFrom(message, ref ep);
to = (IPEndPoint) ep;
return length;
}
public void Clear()
{
_bb.Clear();
}
