/// <summary>
/// Raise the MessageReceived event.
/// </summary>
/// <param name="e">
/// The event arguments.
/// </param>
protected virtual void OnMessageReceived(MxMessageReceiveEventArgs e)
{
var handler = this.MessageReceived;
if (handler != null)
{
handler(this, e);
}
}
/// <summary>
/// Called when we have received a fragment from the underlying client.
/// </summary>
/// <param name="sender">
/// The sender.
/// </param>
/// <param name="mxMessageEventArgs">
/// The message event args.
/// </param>
private void ClientOnMessageReceived(object sender, MxMessageReceiveEventArgs mxMessageEventArgs)
{
if (mxMessageEventArgs.ProtocolID != MxMessage.ReliableProtocol)
{
return;
}
var data = mxMessageEventArgs.Payload;
// Format of a packet is:
// Byte 0 - 3: message ID
// Byte 4 - 5: length
// Byte 6: current index
// Byte 7: total packets
// Remaining bytes are the fragment data
var messageID = BitConverter.ToInt32(data, 0);
var length = BitConverter.ToUInt16(data, 4);
var currentIndex = (int)data[6];
var totalPackets = (int)data[7];
if (!this.m_ActiveReceiveMessages.ContainsKey(messageID))
{
// Add a new entry in the active receive messages dictionary.
this.m_ActiveReceiveMessages.Add(
messageID,
new MxReliabilityReceiveState(messageID, totalPackets));
}
// Check for invalid payload.
if ((length - 1) + DataOffset >= data.Length)
{
var errorMessage =
"The payload data received had an invalid length for the " +
"data that was present. ";
errorMessage += "\r\n";
errorMessage += "\r\n";
errorMessage += "Client Endpoint: " + mxMessageEventArgs.Client.Endpoint + "\r\n";
errorMessage += "Message ID: " + messageID + "\r\n";
errorMessage += "Message Protocol: " + mxMessageEventArgs.ProtocolID + "\r\n";
errorMessage += "Length: " + length + "\r\n";
errorMessage += "Current Index: " + currentIndex + "\r\n";
errorMessage += "Total Packets: " + totalPackets + "\r\n";
errorMessage += "Payload Length: " + data.Length + "\r\n";
errorMessage += "Payload Length minus Offset: " + (data.Length - DataOffset) + "\r\n";
var exception = new InvalidDataException(errorMessage);
exception.Data.Add("Payload", data);
throw exception;
}
// Extract the fragment data.
var fragmentData = new byte[length];
for (var i = 0; i < length; i++)
{
fragmentData[i] = data[i + DataOffset];
}
// Set the fragment data into the received message.
this.m_ActiveReceiveMessages[messageID].SetFragment(currentIndex, new Fragment(fragmentData, FragmentStatus.Received));
// Perform the receive update to fire events and finalize state if we have all the fragments.
this.UpdateReceive();
}
/// <summary>
/// Handles the packets currently queued in the receive queue.
/// </summary>
private void PerformReceive()
{
if (this.m_ReceivedPackets.Count == 0)
{
this.m_DisconnectAccumulator++;
return;
}
foreach (var packet in this.m_ReceivedPackets)
{
this.m_DisconnectAccumulator = 0;
using (var memory = new MemoryStream(packet))
{
var serializer = new MxMessageSerializer();
var message = (MxMessage)serializer.Deserialize(memory, null, typeof(MxMessage));
if (message.Payloads == null)
{
message.Payloads = new MxPayload[0];
}
foreach (var payload in message.Payloads.Where(payload => payload.Data == null))
{
payload.Data = new byte[0];
}
var difference = MxUtility.GetSequenceNumberDifference(
message.Sequence,
this.m_RemoteSequenceNumber);
if (difference > 0)
{
// Calculate the difference between the old
// sequence number and the new sequence number
// we need to push "false" into the queue for
// the missing messages.
for (var i = 0; i < difference - 1; i++)
{
this.PushIntoQueue(this.m_ReceiveQueue, false);
}
// We push the "true" value for this message after
// firing the OnReceived event (so we can not acknowledge
// it if the event callbacks do not want us to).
// Check based on items in the queue.
foreach (var kv in this.m_SendQueue.ToArray())
{
var idx = kv.Key;
if (!message.HasAck(idx))
{
// We aren't acking this message yet.
continue;
}
if (message.DidAck(idx))
{
// We already checked for existance of the key above.
var sendTimestamp = this.m_SendQueue[idx];
var rtt = this.GetUnixTimestamp() - sendTimestamp;
this.PushIntoQueue(this.m_RTTQueue, rtt);
var payloads = this.m_SendMessageQueue[idx];
this.m_SendQueue.Remove(idx);
this.m_SendMessageQueue.Remove(idx);
this.Latency = rtt;
foreach (var payload in payloads.Value)
{
this.OnMessageAcknowledged(
new MxMessageEventArgs {
Client = this, Payload = payload, ProtocolID = payloads.Key
});
}
}
else
{
this.HandleLostMessage(idx);
}
}
foreach (var kv in this.m_SendQueue.ToArray())
{
var idx = kv.Key;
if (MxUtility.GetSequenceNumberDifference(message.Ack - MxUtility.UIntBitsize, idx) > 0)
{
this.HandleLostMessage(idx);
}
}
this.m_RemoteSequenceNumber = message.Sequence;
var doNotAcknowledge = false;
foreach (var payload in message.Payloads)
{
var eventArgs = new MxMessageReceiveEventArgs {
Client = this, Payload = payload.Data, DoNotAcknowledge = doNotAcknowledge, ProtocolID = message.ProtocolID
};
this.OnMessageReceived(eventArgs);
doNotAcknowledge = eventArgs.DoNotAcknowledge;
}
if (!doNotAcknowledge)
{
this.PushIntoQueue(this.m_ReceiveQueue, true);
}
}
}
}
this.m_ReceivedPackets.Clear();
}
/// <summary>
/// Called when we have received a fragment from the underlying client.
/// </summary>
/// <param name="sender">
/// The sender.
/// </param>
/// <param name="mxMessageEventArgs">
/// The message event args.
/// </param>
private void ClientOnMessageReceived(object sender, MxMessageReceiveEventArgs mxMessageEventArgs)
{
if (mxMessageEventArgs.ProtocolID != MxMessage.ReliableProtocol)
{
return;
}
var data = mxMessageEventArgs.Payload;
// Format of a packet is:
// Byte 0 - 3: message ID
// Byte 4 - 5: length
// Byte 6: current index
// Byte 7: total packets
// Remaining bytes are the fragment data
var messageID = BitConverter.ToInt32(data, 0);
var length = BitConverter.ToUInt16(data, 4);
var currentIndex = (int)data[6];
var totalPackets = (int)data[7];
if (!this.m_ActiveReceiveMessages.ContainsKey(messageID))
{
// Add a new entry in the active receive messages dictionary.
this.m_ActiveReceiveMessages.Add(
messageID,
new MxReliabilityReceiveState(messageID, totalPackets));
}
// Check for invalid payload.
if ((length - 1) + DataOffset >= data.Length)
{
var errorMessage =
"The payload data received had an invalid length for the " +
"data that was present. ";
errorMessage += "\r\n";
errorMessage += "\r\n";
errorMessage += "Client Endpoint: " + mxMessageEventArgs.Client.Endpoint + "\r\n";
errorMessage += "Message ID: " + messageID + "\r\n";
errorMessage += "Message Protocol: " + mxMessageEventArgs.ProtocolID + "\r\n";
errorMessage += "Length: " + length + "\r\n";
errorMessage += "Current Index: " + currentIndex + "\r\n";
errorMessage += "Total Packets: " + totalPackets + "\r\n";
errorMessage += "Payload Length: " + data.Length + "\r\n";
errorMessage += "Payload Length minus Offset: " + (data.Length - DataOffset) + "\r\n";
var exception = new InvalidDataException(errorMessage);
exception.Data.Add("Payload", data);
throw exception;
}
// Extract the fragment data.
var fragmentData = new byte[length];
for (var i = 0; i < length; i++)
{
fragmentData[i] = data[i + DataOffset];
}
// Set the fragment data into the received message.
this.m_ActiveReceiveMessages[messageID].SetFragment(currentIndex, new Fragment(fragmentData, FragmentStatus.Received));
// Perform the receive update to fire events and finalize state if we have all the fragments.
this.UpdateReceive();
}
