/// <summary>
/// This function handles turning a bundle of messages (representing all messages accrued in a timeslice),
/// into 1 or more packets, combining multiple messages into one packet or spliting large message across
/// several packets as needed.
/// </summary>
/// <param name="bundle"></param>
private void SendBundle(NetworkBundle bundle)
{
log.DebugFormat("[{0}] Sending Bundle", session.LoggingIdentifier);
bool writeOptionalHeaders = true;
List <MessageFragment> fragments = new List <MessageFragment>();
// Pull all messages out and create MessageFragment objects
while (bundle.HasMoreMessages)
{
var message = bundle.Dequeue();
var fragment = new MessageFragment(message, ConnectionData.FragmentSequence++);
fragments.Add(fragment);
}
log.DebugFormat("[{0}] Bundle Fragment Count: {1}", session.LoggingIdentifier, fragments.Count);
// Loop through while we have fragements
while (fragments.Count > 0 || writeOptionalHeaders)
{
ServerPacket packet = new ServerPacket();
PacketHeader packetHeader = packet.Header;
if (fragments.Count > 0)
{
packetHeader.Flags |= PacketHeaderFlags.BlobFragments;
}
if (bundle.EncryptedChecksum)
{
packetHeader.Flags |= PacketHeaderFlags.EncryptedChecksum;
}
uint availableSpace = Packet.MaxPacketDataSize;
// Pull first message and see if it is a large one
var firstMessage = fragments.FirstOrDefault();
if (firstMessage != null)
{
// If a large message send only this one, filling the whole packet
if (firstMessage.DataRemaining >= availableSpace)
{
log.DebugFormat("[{0}] Sending large fragment", session.LoggingIdentifier);
ServerPacketFragment spf = firstMessage.GetNextFragment();
packet.Fragments.Add(spf);
availableSpace -= (uint)spf.Length;
if (firstMessage.DataRemaining <= 0)
{
fragments.Remove(firstMessage);
}
}
// Otherwise we'll write any optional headers and process any small messages that will fit
else
{
if (writeOptionalHeaders)
{
writeOptionalHeaders = false;
WriteOptionalHeaders(bundle, packet);
availableSpace -= (uint)packet.Data.Length;
}
// Create a list to remove completed messages after iterator
List <MessageFragment> removeList = new List <MessageFragment>();
foreach (MessageFragment fragment in fragments)
{
// Is this a large fragment and does it have a tail that needs sending?
if (!fragment.TailSent && availableSpace >= fragment.TailSize)
{
log.DebugFormat("[{0}] Sending tail fragment", session.LoggingIdentifier);
ServerPacketFragment spf = fragment.GetTailFragment();
packet.Fragments.Add(spf);
availableSpace -= (uint)spf.Length;
}
// Otherwise will this message fit in the remaining space?
else if (availableSpace >= fragment.NextSize)
{
log.DebugFormat("[{0}] Sending small message", session.LoggingIdentifier);
ServerPacketFragment spf = fragment.GetNextFragment();
packet.Fragments.Add(spf);
availableSpace -= (uint)spf.Length;
}
// If message is out of data, set to remove it
if (fragment.DataRemaining <= 0)
{
removeList.Add(fragment);
}
}
// Remove all completed messages
fragments.RemoveAll(x => removeList.Contains(x));
}
}
// If no messages, write optional headers
else
{
log.DebugFormat("[{0}] No messages, just sending optional headers", session.LoggingIdentifier);
if (writeOptionalHeaders)
{
writeOptionalHeaders = false;
WriteOptionalHeaders(bundle, packet);
availableSpace -= (uint)packet.Data.Length;
}
}
EnqueueSend(packet);
}
}
/// <summary>
/// This function handles turning a bundle of messages (representing all messages accrued in a timeslice),
/// into 1 or more packets, combining multiple messages into one packet or spliting large message across
/// several packets as needed.
///
/// 1 Create Packet
/// 2 If first packet for this bundle, fill any optional headers
/// 3 Append messages that will fit
/// 4 If we have more messages, create additional packets.
/// 5 If any packet is greater than the max packet size, split it across two fragments
/// </summary>
/// <param name="bundle"></param>
private void SendBundle(NetworkBundle bundle)
{
bool firstPacket = true;
MessageFragment carryOverMessage = null;
while (firstPacket || carryOverMessage != null || bundle.HasMoreMessages)
{
ServerPacket packet = new ServerPacket();
PacketHeader packetHeader = packet.Header;
if (bundle.EncryptedChecksum)
{
packetHeader.Flags |= PacketHeaderFlags.EncryptedChecksum;
}
uint availableSpace = Packet.MaxPacketDataSize;
if (firstPacket)
{
firstPacket = false;
if (bundle.SendAck) // 0x4000
{
packetHeader.Flags |= PacketHeaderFlags.AckSequence;
packet.BodyWriter.Write(lastReceivedPacketSequence);
}
if (bundle.TimeSync) // 0x1000000
{
packetHeader.Flags |= PacketHeaderFlags.TimeSynch;
log.DebugFormat("[{0}] Outgoing TimeSync TS: {1}", session.Account, ConnectionData.ServerTime);
packet.BodyWriter.Write(ConnectionData.ServerTime);
}
if (bundle.ClientTime != -1f) // 0x4000000
{
packetHeader.Flags |= PacketHeaderFlags.EchoResponse;
packet.BodyWriter.Write(bundle.ClientTime);
packet.BodyWriter.Write((float)ConnectionData.ServerTime - bundle.ClientTime);
}
availableSpace -= (uint)packet.Data.Length;
}
if (carryOverMessage != null || bundle.HasMoreMessages)
{
packetHeader.Flags |= PacketHeaderFlags.BlobFragments;
int fragmentCount = 0;
while (carryOverMessage != null || bundle.HasMoreMessages)
{
MessageFragment currentMessageFragment = null;
if (carryOverMessage != null) // If we have a carryOverMessage, use that
{
currentMessageFragment = carryOverMessage;
carryOverMessage = null;
}
else // If we don't have a carryOverMessage, go ahead and dequeue next message from the bundle
{
currentMessageFragment = new MessageFragment(bundle.Dequeue());
}
var currentGameMessage = currentMessageFragment.Message;
availableSpace -= PacketFragmentHeader.HeaderSize; // Account for fragment header
// Compute amount of data to send based on the total length and current position
uint dataToSend = (uint)currentGameMessage.Data.Length - currentMessageFragment.Position;
if (dataToSend > availableSpace) // Message is too large to fit in packet
{
carryOverMessage = currentMessageFragment;
if (fragmentCount == 0) // If this is first message in packet, this is just a really large message, so proceed with splitting it
{
dataToSend = availableSpace;
}
else // Otherwise there are other messages already, so we'll break and come back and see if the message will fit
{
break;
}
}
if (currentMessageFragment.Count == 0) // Compute number of fragments if we have not already
{
uint remainingData = (uint)currentGameMessage.Data.Length - dataToSend;
currentMessageFragment.Count = (ushort)(Math.Ceiling((double)remainingData / PacketFragment.MaxFragmentDataSize) + 1);
}
// Set sequence, if new, pull next sequence from ConnectionData, if it is a carryOver, reuse that sequence
currentMessageFragment.Sequence = currentMessageFragment.Sequence == 0 ? ConnectionData.FragmentSequence++ : currentMessageFragment.Sequence;
// Read data starting at current position reading dataToSend bytes
currentGameMessage.Data.Seek(currentMessageFragment.Position, SeekOrigin.Begin);
byte[] data = new byte[dataToSend];
currentGameMessage.Data.Read(data, 0, (int)dataToSend);
// Build ServerPacketFragment structure
ServerPacketFragment fragment = new ServerPacketFragment(data);
fragment.Header.Sequence = currentMessageFragment.Sequence;
fragment.Header.Id = 0x80000000;
fragment.Header.Count = currentMessageFragment.Count;
fragment.Header.Index = currentMessageFragment.Index;
fragment.Header.Group = (ushort)currentMessageFragment.Message.Group;
// Increment position and index
currentMessageFragment.Position = currentMessageFragment.Position + dataToSend;
currentMessageFragment.Index++;
// Add fragment to packet
packet.AddFragment(fragment);
fragmentCount++;
// Deduct consumed space
availableSpace -= dataToSend;
// Smallest message I am aware of requires HeaderSize + 4 bytes, so if we have less space then that, go ahead and break
if (availableSpace <= PacketFragmentHeader.HeaderSize + 4)
{
break;
}
}
}
packetQueue.Enqueue(packet);
}
}
