/// <summary>
/// Send given packet to the client
/// </summary>
/// <param name="packet">the packet to send</param>
public void Send(Packet packet)
{
if (!IsConnectionAlive)
{
Task t = new Task(delegate()
{
OnSent(this, SendStatus.FAIL_NOT_CONNECTED, packet);
});
t.Start();
return;
}
if (packet.PacketByteSize <= 0)
{
Task t = new Task(delegate()
{
OnSent(this, SendStatus.FAIL_INVALID_PACKET, packet);
});
t.Start();
return;
}
lock (m_sendLock)
{
Packet sendSizePacket = new Packet(null, 0, Preamble.SIZE_PACKET_LENGTH, false);
PacketTransporter transport = new PacketTransporter(PacketType.SIZE, sendSizePacket, 0, Preamble.SIZE_PACKET_LENGTH, this, packet);
//sendSizePacket.SetPacket(BitConverter.GetBytes(packet.GetPacketByteSize()), 4);
sendSizePacket.SetPacket(Preamble.ToPreamblePacket(packet.PacketByteSize), 0, Preamble.SIZE_PACKET_LENGTH);
if (m_sendEvent.TryLock())
{
try { m_client.Client.BeginSend(sendSizePacket.PacketRaw, 0, Preamble.SIZE_PACKET_LENGTH, SocketFlags.None, new AsyncCallback(IocpTcpSocket.onSent), transport); }
catch (Exception ex)
{
Console.WriteLine(ex.Message + " >" + ex.StackTrace);
Disconnect();
return;
}
}
else
{
lock (m_sendQueueLock)
{
m_sendQueue.Enqueue(transport);
}
}
}
}
/// <summary>
/// Receive callback function
/// </summary>
/// <param name="result">result</param>
private static void onReceived(IAsyncResult result)
{
PacketTransporter transport = result.AsyncState as PacketTransporter;
Socket socket = transport.m_iocpTcpClient.m_client.Client;
int readSize = 0;
try { readSize = socket.EndReceive(result); }
catch (Exception ex)
{
Console.WriteLine(ex.Message + " >" + ex.StackTrace);
transport.m_iocpTcpClient.Disconnect(); return;
}
if (readSize == 0)
{
transport.m_iocpTcpClient.Disconnect();
return;
}
if (readSize < transport.m_size)
{
transport.m_offset = transport.m_offset + readSize;
transport.m_size = transport.m_size - readSize;
try{ socket.BeginReceive(transport.m_packet.PacketRaw, transport.m_offset, transport.m_size, SocketFlags.None, new AsyncCallback(IocpTcpClient.onReceived), transport); }
catch (Exception ex)
{
Console.WriteLine(ex.Message + " >" + ex.StackTrace);
transport.m_iocpTcpClient.Disconnect(); return;
}
}
else
{
if (transport.m_packetType == PacketType.SIZE)
{
//int shouldReceive = BitConverter.ToInt32(transport.m_packet.PacketRaw, 0);
int shouldReceive = Preamble.ToShouldReceive(transport.m_packet.PacketRaw);
// preamble packet is corrupted
// try to receive another byte to check preamble
if (shouldReceive < 0)
{
int preambleOffset = Preamble.CheckPreamble(transport.m_packet.PacketRaw);
// set offset to length - preamble offset
transport.m_offset = transport.m_packet.PacketByteSize - preambleOffset;
// need to receive as much as preamble offset
transport.m_size = preambleOffset;
try
{
// shift to left by preamble offset
Buffer.BlockCopy(transport.m_packet.PacketRaw, preambleOffset, transport.m_packet.PacketRaw, 0, transport.m_packet.PacketByteSize - preambleOffset);
// receive rest of bytes at the end
socket.BeginReceive(transport.m_packet.PacketRaw, transport.m_offset, transport.m_size, SocketFlags.None, new AsyncCallback(IocpTcpClient.onReceived), transport);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message + " >" + ex.StackTrace);
transport.m_iocpTcpClient.Disconnect(); return;
}
return;
}
Packet recvPacket = new Packet(null, 0, shouldReceive);
PacketTransporter dataTransport = new PacketTransporter(PacketType.DATA, recvPacket, 0, shouldReceive, transport.m_iocpTcpClient);
try { socket.BeginReceive(recvPacket.PacketRaw, 0, shouldReceive, SocketFlags.None, new AsyncCallback(IocpTcpClient.onReceived), dataTransport); }
catch (Exception ex)
{
Console.WriteLine(ex.Message + " >" + ex.StackTrace);
transport.m_iocpTcpClient.Disconnect(); return;
}
}
else
{
PacketTransporter sizeTransport = new PacketTransporter(PacketType.SIZE, transport.m_iocpTcpClient.m_recvSizePacket, 0, Preamble.SIZE_PACKET_LENGTH, transport.m_iocpTcpClient);
try { socket.BeginReceive(sizeTransport.m_packet.PacketRaw, 0, Preamble.SIZE_PACKET_LENGTH, SocketFlags.None, new AsyncCallback(IocpTcpClient.onReceived), sizeTransport); }
catch (Exception ex)
{
Console.WriteLine(ex.Message + " >" + ex.StackTrace);
transport.m_iocpTcpClient.Disconnect(); return;
}
transport.m_iocpTcpClient.OnReceived(transport.m_iocpTcpClient, transport.m_packet);
}
}
}
