public static Packet Read(Stream stream)
{
BinaryReader reader = new BinaryReader(stream);
PacketType type = (PacketType)reader.ReadInt32();
Packet packet = null;
switch (type)
{
case PacketType.ConnectionState: packet = new ConnectionStatePacket(); break;
case PacketType.Request: packet = new RequestPacket(); break;
case PacketType.Event: break;
case PacketType.PlayfieldData: packet = new PlayfieldDataPacket(); break;
case PacketType.PlayfieldMap: packet = new PlayfieldMapPacket(); break;
case PacketType.EmpyrionState: packet = new EmpyrionStatePacket(); break;
default: throw new Exception("Invalid packet type received.");
}
if (packet == null)
{
return(null);
}
packet.ReadData(reader);
return(packet);
}
protected virtual void HandleConnectionRequest(Connection connection, Packet packet)
{
if (packet is ConnectionStatePacket)
{
ConnectionStatePacket state = (ConnectionStatePacket)packet;
if (state.Verify(Version))
{
// Client is attempting to establish a connection with the correct version.
connection.PacketReceived -= HandleConnectionRequest;
connection.PacketReceived += Connection_PacketReceived;
connection.Send(new ConnectionStatePacket(ConnectionStatePacket.ConnectionState.Accepted, Version));
}
else
{
// Client is using an unsupported version.
connection.Send(new ConnectionStatePacket(ConnectionStatePacket.ConnectionState.Rejected, Version));
connection.Close();
}
}
else
{
// Unexpected communication, client must be invalid.
connection.Close();
}
}
private void Connection_Verify(Connection connection, Packet packet)
{
ConnectionStatePacket state = packet as ConnectionStatePacket;
if (state?.State == ConnectionStatePacket.ConnectionState.Accepted)
{
connection.PacketReceived -= this.Connection_Verify;
connection.PacketReceived += this.Connection_PacketReceived;
if (this.ConnectSuccess != null)
{
this.ConnectSuccess(this);
}
// Retry failed packets.
foreach (Packet retry in this.failedPackets)
{
this.Send(retry);
}
}
else
{
try
{
connection.Close();
if (this.ConnectFailure != null)
{
this.ConnectFailure(this);
}
}
catch { }
}
}