/// <summary>
/// Выполняет одноразовую операцию получения и отправки пакетов.
/// </summary>
public override void Process()
{
// Flush send buffer
OSCARQueueEntity toSend;
while (!m_sendBuffer.IsEmpty)
if (m_sendBuffer.TryDequeue(out toSend))
sendPacket(toSend.Host, ref toSend.FLAP, toSend.Data);
else
break;
// Receive packets
byte[] data;
EndPoint from;
while (this.readPacket(ref m_svcFlap, out data, out from))
HandlePacket(ref m_svcFlap, data, (IPEndPoint)from);
// Check connect attempt
if (m_connReq != null) // IsConnecting
{
// Did connection attempt failed (No response?)
if ((Environment.TickCount - m_connReq.LastSent) >= ConnReq.Timeout)
{
// Did we reached fail limit?
if (m_connReq.AttemptsTaken >= ConnReq.AttemptsLimit)
{
var host = m_connReq.Host;
var error = new TimeoutException("OSCARUdp connection attempt timed out, response was not received.");
m_connReq = null;
m_events.ConnectFailed(this, new HostErrorEventArgs(host, error));
}
else
{
// Re-send
m_connReq.Send(this, ref m_svcFlap);
}
}
}
}
private void HandlePacket(ref FLAPHeader flap, byte[] data, IPEndPoint from)
{
var tlvs = (TLVChain)data;
var type = tlvs[SvcLayer.TLV_TYPE].Value[0];
switch(type)
{
case SvcLayer.TYPE_USER_DATA:
if (Connections.Contains(from))
m_events.TriggerPacketReceived(this, new PacketEventArgs(from, ref flap, tlvs[SvcLayer.TLV_USER_DATA].Value));
break;
case SvcLayer.TYPE_CONNECT_ACCEPT:
if (IsConnecting
&& m_connReq.Host.Equals(from)
&& Misc.CompareByteArrays(m_connReq.Hash, tlvs[SvcLayer.TLV_CONNECT_HASH].Value))
{
m_connReq = null;
Connections.Add(from);
m_events.Connected(this, new HostConnectEventArgs(from, true));
}
break;
case SvcLayer.TYPE_CONNECT_REQST:
if (m_acceptsIncomingConnections
&& (!this.IsConnecting || m_connReq.Host != from)
&& m_events.AuthorizeIncomingConnection(this, new HostEventArgs(from))
&& !this.Connections.Contains(from))
{
var tosend = new TLVChain(2)
{
new TLV { TypeID = SvcLayer.TLV_TYPE, Value = new byte[1] { SvcLayer.TYPE_CONNECT_ACCEPT } },
new TLV { TypeID = SvcLayer.TLV_CONNECT_HASH, Value = tlvs[SvcLayer.TLV_CONNECT_HASH].Value }
};
sendPacket(from, ref flap, (byte[])tosend);
Connections.Add(from);
m_events.Connected(this, new HostConnectEventArgs(from, false));
}
break;
}
}
/// <summary>
/// Запускает попытку исходящего подключения к удаленному хосту.
/// </summary>
/// <param name="to">Удаленный узел для подключения</param>
/// <param name="async">Значение False заблокирует исполнение программы до окончания исходящего подключения</param>
public override void Connect(EndPoint to, bool async = true)
{
if (this.IsConnecting)
throw new InvalidOperationException("There is already active outgoing connect attempt in progress.");
else if(this.Connections.Contains(to))
throw new ArgumentException("This address is already connected to current peer!");
m_connReq = new ConnReq(to);
m_connReq.Send(this, ref m_svcFlap);
m_events.ConnectStarted(this, new HostEventArgs(to));
if (!async)
while (this.IsConnecting)
Thread.Sleep(50);
}
