// Should validate the handshake response from the server
private void ReceiveAsync_Completed(object sender, SocketAsyncEventArgs e)
{
if (e.BytesTransferred > 0 && e.SocketError == SocketError.Success)
{
int bytesAlreadyProcessed = 0; // Count of the total freshly transferred bytes processed so far
ReceiveToken token = (ReceiveToken)e.UserToken;
if (!headerExchanged)
{
byte[] header = HandleHttpHeader(e, ref bytesAlreadyProcessed);
token = (ReceiveToken)e.UserToken;
if (header == null)
{
DoRead(e);
return;
}
else if (Websockets.ValidateResponseHeader(headerHash, header))
{
headerExchanged = true;
token.maxAllowedBytes = int.MaxValue;
e.UserToken = token;
// Ping the server to finalize the player's connection
Send(Text.CreateFromString(Time.Timestep, InstanceGuid.ToString(), true, Receivers.Server,
MessageGroupIds.NETWORK_ID_REQUEST, true));
}
else
{
// Improper header, so a disconnect is required
Disconnect(true);
return;
}
}
while (bytesAlreadyProcessed < e.BytesTransferred)
{
byte[] data = HandleData(e, true, ref bytesAlreadyProcessed);
if (data == null)
{
break;
}
FrameStream frame = Factory.DecodeMessage(data, false, MessageGroupIds.TCP_FIND_GROUP_ID, Server);
FireRead(frame, Server);
}
DoRead(e);
}
else
{
Disconnect(true);
}
}
/// <summary>
/// Infinite loop listening for new data from all connected clients on a separate thread.
/// This loop breaks when readThreadCancel is set to true
/// </summary>
/// <summary>
///无限循环在单独的线程上监听来自所有连接客户端的新数据。
///当readThreadCancel设置为true时，此循环中断
/// </ summary>
private void ReadNetwork()
{
IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, 0);
string incomingEndpoint = string.Empty;
try
{
BMSByte packet = null;
// Intentional infinite loop
while (IsBound)
{
//如果读取已被标记为取消，则从此循环中断开
// If the read has been flagged to be canceled then break from this loop
if (readThreadCancel)
{
return;
}
try
{
// Read a packet from the network
packet = Client.Receive(ref groupEP, ref incomingEndpoint);
if (PacketLossSimulation > 0.0f && new Random().NextDouble() <= PacketLossSimulation)
{
// Skip this message
continue;
}
BandwidthIn += (ulong)packet.Size;
}
catch (SocketException /*ex*/)
{
// This is a common exception when we exit the blocking call
//Logging.BMSLog.LogException(ex);
Disconnect(true);
}
// Check to make sure a message was received
if (packet == null || packet.Size <= 0)
{
continue;
}
// This message was not from the server
if (groupEP.Address != Server.IPEndPointHandle.Address &&
groupEP.Port != Server.IPEndPointHandle.Port)
{
if (packet.Size == 1 && (packet[0] == SERVER_BROADCAST_CODE || packet[1] == CLIENT_BROADCAST_CODE))
{
}
else if (packet.Size.Between(2, 4) && packet[0] == BROADCAST_LISTING_REQUEST_1 && packet[1] == BROADCAST_LISTING_REQUEST_2 && packet[2] == BROADCAST_LISTING_REQUEST_3)
{
//这可能是一个本地列表请求，所以用客户端标志字节进行响应
// This may be a local listing request so respond with the client flag byte
Client.Send(new byte[] { CLIENT_BROADCAST_CODE }, 1, groupEP);
}
continue;
}
// Check to see if the headers have been exchanged
if (!headerExchanged)
{
if (Websockets.ValidateResponseHeader(headerHash, packet.CompressBytes()))
{
headerExchanged = true;
// TODO: When getting the user id, it should also get the server time
// by using the current time in the payload and getting it back along with server time
// Ping the server to finalize the player's connection
Send(Text.CreateFromString(Time.Timestep, InstanceGuid.ToString(), false, Receivers.Server, MessageGroupIds.NETWORK_ID_REQUEST, false), true);
}
else if (packet.Size != 1 || packet[0] != 0)
{
Disconnect(true);
break;
}
else
{
continue;
}
}
else
{
if (packet.Size < 17)
{
continue;
}
// 格式的字节数据到一个udppacket结构
// Format the byte data into a UDPPacket struct
UDPPacket formattedPacket = TranscodePacket(Server, packet);
// Check to see if this is a confirmation packet, which is just
// a packet to say that the reliable packet has been read
if (formattedPacket.isConfirmation)
{
if (formattedPacket.groupId == MessageGroupIds.DISCONNECT)
{
CloseConnection();
return;
}
OnMessageConfirmed(server, formattedPacket);
continue;
}
//将数据包添加到管理器，以便可以在完成时跟踪和执行
// Add the packet to the manager so that it can be tracked and executed on complete
packetManager.AddPacket(formattedPacket, PacketSequenceComplete, this);
}
}
}
catch (Exception ex)
{
Logging.BMSLog.LogException(ex);
Disconnect(true);
}
}
