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using System;
using System.Collections;
using System.Collections.Generic;
using libsecondlife;
using libsecondlife.Packets;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;
using System.Timers;
using OpenSim.Framework.Utilities;
using OpenSim.Framework.Interfaces;
namespace OpenSim
{
public class ClientViewBase
{
protected BlockingQueue<QueItem> PacketQueue;
protected Dictionary<uint, uint> PendingAcks = new Dictionary<uint, uint>();
protected Dictionary<uint, Packet> NeedAck = new Dictionary<uint, Packet>();
protected System.Timers.Timer AckTimer;
protected uint Sequence = 0;
protected object SequenceLock = new object();
protected const int MAX_APPENDED_ACKS = 10;
protected const int RESEND_TIMEOUT = 4000;
protected const int MAX_SEQUENCE = 0xFFFFFF;
public uint CircuitCode;
public EndPoint userEP;
protected OpenSimNetworkHandler m_networkServer;
public ClientViewBase()
{
}
protected virtual void ProcessInPacket(Packet Pack)
{
}
protected virtual void ProcessOutPacket(Packet Pack)
{
// Keep track of when this packet was sent out
Pack.TickCount = Environment.TickCount;
//Console.WriteLine("OUT: " + Pack.Type.ToString());
if (!Pack.Header.Resent)
{
// Set the sequence number
lock (SequenceLock)
{
if (Sequence >= MAX_SEQUENCE)
Sequence = 1;
else
Sequence++;
Pack.Header.Sequence = Sequence;
}
if (Pack.Header.Reliable) //DIRTY HACK
{
lock (NeedAck)
{
if (!NeedAck.ContainsKey(Pack.Header.Sequence))
{
try
{
NeedAck.Add(Pack.Header.Sequence, Pack);
}
catch (Exception e) // HACKY
{
e.ToString();
// Ignore
// Seems to throw a exception here occasionally
// of 'duplicate key' despite being locked.
// !?!?!?
}
}
else
{
// Client.Log("Attempted to add a duplicate sequence number (" +
// packet.Header.Sequence + ") to the NeedAck dictionary for packet type " +
// packet.Type.ToString(), Helpers.LogLevel.Warning);
}
}
// Don't append ACKs to resent packets, in case that's what was causing the
// delivery to fail
if (!Pack.Header.Resent)
{
// Append any ACKs that need to be sent out to this packet
lock (PendingAcks)
{
if (PendingAcks.Count > 0 && PendingAcks.Count < MAX_APPENDED_ACKS &&
Pack.Type != PacketType.PacketAck &&
Pack.Type != PacketType.LogoutRequest)
{
Pack.Header.AckList = new uint[PendingAcks.Count];
int i = 0;
foreach (uint ack in PendingAcks.Values)
{
Pack.Header.AckList[i] = ack;
i++;
}
PendingAcks.Clear();
Pack.Header.AppendedAcks = true;
}
}
}
}
}
byte[] ZeroOutBuffer = new byte[4096];
byte[] sendbuffer;
sendbuffer = Pack.ToBytes();
try
{
if (Pack.Header.Zerocoded)
{
int packetsize = Helpers.ZeroEncode(sendbuffer, sendbuffer.Length, ZeroOutBuffer);
m_networkServer.SendPacketTo(ZeroOutBuffer, packetsize, SocketFlags.None, CircuitCode);//userEP);
}
else
{
m_networkServer.SendPacketTo(sendbuffer, sendbuffer.Length, SocketFlags.None, CircuitCode); //userEP);
}
}
catch (Exception)
{
OpenSim.Framework.Console.MainConsole.Instance.WriteLine(OpenSim.Framework.Console.LogPriority.MEDIUM, "OpenSimClient.cs:ProcessOutPacket() - WARNING: Socket exception occurred on connection " + userEP.ToString() + " - killing thread");
this.KillThread();
}
}
public virtual void InPacket(Packet NewPack)
{
// Handle appended ACKs
if (NewPack.Header.AppendedAcks)
{
lock (NeedAck)
{
foreach (uint ack in NewPack.Header.AckList)
{
NeedAck.Remove(ack);
}
}
}
// Handle PacketAck packets
if (NewPack.Type == PacketType.PacketAck)
{
PacketAckPacket ackPacket = (PacketAckPacket)NewPack;
lock (NeedAck)
{
foreach (PacketAckPacket.PacketsBlock block in ackPacket.Packets)
{
NeedAck.Remove(block.ID);
}
}
}
else if ((NewPack.Type == PacketType.StartPingCheck))
{
//reply to pingcheck
libsecondlife.Packets.StartPingCheckPacket startPing = (libsecondlife.Packets.StartPingCheckPacket)NewPack;
libsecondlife.Packets.CompletePingCheckPacket endPing = new CompletePingCheckPacket();
endPing.PingID.PingID = startPing.PingID.PingID;
OutPacket(endPing);
}
else
{
QueItem item = new QueItem();
item.Packet = NewPack;
item.Incoming = true;
this.PacketQueue.Enqueue(item);
}
}
public virtual void OutPacket(Packet NewPack)
{
QueItem item = new QueItem();
item.Packet = NewPack;
item.Incoming = false;
this.PacketQueue.Enqueue(item);
}
# region Low Level Packet Methods
protected void ack_pack(Packet Pack)
{
if (Pack.Header.Reliable)
{
libsecondlife.Packets.PacketAckPacket ack_it = new PacketAckPacket();
ack_it.Packets = new PacketAckPacket.PacketsBlock[1];
ack_it.Packets[0] = new PacketAckPacket.PacketsBlock();
ack_it.Packets[0].ID = Pack.Header.Sequence;
ack_it.Header.Reliable = false;
OutPacket(ack_it);
}
/*
if (Pack.Header.Reliable)
{
lock (PendingAcks)
{
uint sequence = (uint)Pack.Header.Sequence;
if (!PendingAcks.ContainsKey(sequence)) { PendingAcks[sequence] = sequence; }
}
}*/
}
protected void ResendUnacked()
{
int now = Environment.TickCount;
lock (NeedAck)
{
foreach (Packet packet in NeedAck.Values)
{
if ((now - packet.TickCount > RESEND_TIMEOUT) && (!packet.Header.Resent))
{
OpenSim.Framework.Console.MainConsole.Instance.WriteLine(OpenSim.Framework.Console.LogPriority.VERBOSE, "Resending " + packet.Type.ToString() + " packet, " +
(now - packet.TickCount) + "ms have passed");
packet.Header.Resent = true;
OutPacket(packet);
}
}
}
}
protected void SendAcks()
{
lock (PendingAcks)
{
if (PendingAcks.Count > 0)
{
if (PendingAcks.Count > 250)
{
// FIXME: Handle the odd case where we have too many pending ACKs queued up
OpenSim.Framework.Console.MainConsole.Instance.WriteLine(OpenSim.Framework.Console.LogPriority.VERBOSE, "Too many ACKs queued up!");
return;
}
//OpenSim.Framework.Console.MainConsole.Instance.WriteLine("Sending PacketAck");
int i = 0;
PacketAckPacket acks = new PacketAckPacket();
acks.Packets = new PacketAckPacket.PacketsBlock[PendingAcks.Count];
foreach (uint ack in PendingAcks.Values)
{
acks.Packets[i] = new PacketAckPacket.PacketsBlock();
acks.Packets[i].ID = ack;
i++;
}
acks.Header.Reliable = false;
OutPacket(acks);
PendingAcks.Clear();
}
}
}
protected void AckTimer_Elapsed(object sender, ElapsedEventArgs ea)
{
SendAcks();
ResendUnacked();
}
#endregion
protected virtual void KillThread()
{
}
#region Nested Classes
public class QueItem
{
public QueItem()
{
}
public Packet Packet;
public bool Incoming;
}
#endregion
}
}
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