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1
2/*
3* Copyright (c) Contributors, http://www.openmetaverse.org/
4* See CONTRIBUTORS.TXT for a full list of copyright holders.
5*
6* Redistribution and use in source and binary forms, with or without
7* modification, are permitted provided that the following conditions are met:
8* * Redistributions of source code must retain the above copyright
9* notice, this list of conditions and the following disclaimer.
10* * Redistributions in binary form must reproduce the above copyright
11* notice, this list of conditions and the following disclaimer in the
12* documentation and/or other materials provided with the distribution.
13* * Neither the name of the OpenSim Project nor the
14* names of its contributors may be used to endorse or promote products
15* derived from this software without specific prior written permission.
16*
17* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS AND ANY
18* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
21* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27*
28*/
29using System;
30using System.Collections;
31using System.Collections.Generic;
32using libsecondlife;
33using libsecondlife.Packets;
34using System.Net;
35using System.Net.Sockets;
36using System.IO;
37using System.Threading;
38using System.Timers;
39using OpenSim.Framework.Utilities;
40using OpenSim.Framework.Interfaces;
41
42namespace OpenSim.Region.ClientStack
43{
44 public class ClientViewBase
45 {
46 protected BlockingQueue<QueItem> PacketQueue;
47 protected Dictionary<uint, uint> PendingAcks = new Dictionary<uint, uint>();
48 protected Dictionary<uint, Packet> NeedAck = new Dictionary<uint, Packet>();
49
50 protected System.Timers.Timer AckTimer;
51 protected uint Sequence = 0;
52 protected object SequenceLock = new object();
53 protected const int MAX_APPENDED_ACKS = 10;
54 protected const int RESEND_TIMEOUT = 4000;
55 protected const int MAX_SEQUENCE = 0xFFFFFF;
56
57 public uint CircuitCode;
58 public EndPoint userEP;
59
60 protected PacketServer m_networkServer;
61
62 public ClientViewBase()
63 {
64
65 }
66
67 protected virtual void ProcessInPacket(Packet Pack)
68 {
69
70 }
71
72 protected virtual void ProcessOutPacket(Packet Pack)
73 {
74 // Keep track of when this packet was sent out
75 Pack.TickCount = Environment.TickCount;
76
77 if (!Pack.Header.Resent)
78 {
79 // Set the sequence number
80 lock (SequenceLock)
81 {
82 if (Sequence >= MAX_SEQUENCE)
83 Sequence = 1;
84 else
85 Sequence++;
86 Pack.Header.Sequence = Sequence;
87 }
88
89 if (Pack.Header.Reliable) //DIRTY HACK
90 {
91 lock (NeedAck)
92 {
93 if (!NeedAck.ContainsKey(Pack.Header.Sequence))
94 {
95 try
96 {
97 NeedAck.Add(Pack.Header.Sequence, Pack);
98 }
99 catch (Exception e) // HACKY
100 {
101 e.ToString();
102 // Ignore
103 // Seems to throw a exception here occasionally
104 // of 'duplicate key' despite being locked.
105 // !?!?!?
106 }
107 }
108 else
109 {
110 // Client.Log("Attempted to add a duplicate sequence number (" +
111 // packet.Header.Sequence + ") to the NeedAck dictionary for packet type " +
112 // packet.Type.ToString(), Helpers.LogLevel.Warning);
113 }
114 }
115
116 // Don't append ACKs to resent packets, in case that's what was causing the
117 // delivery to fail
118 if (!Pack.Header.Resent)
119 {
120 // Append any ACKs that need to be sent out to this packet
121 lock (PendingAcks)
122 {
123 if (PendingAcks.Count > 0 && PendingAcks.Count < MAX_APPENDED_ACKS &&
124 Pack.Type != PacketType.PacketAck &&
125 Pack.Type != PacketType.LogoutRequest)
126 {
127 Pack.Header.AckList = new uint[PendingAcks.Count];
128 int i = 0;
129
130 foreach (uint ack in PendingAcks.Values)
131 {
132 Pack.Header.AckList[i] = ack;
133 i++;
134 }
135
136 PendingAcks.Clear();
137 Pack.Header.AppendedAcks = true;
138 }
139 }
140 }
141 }
142 }
143
144 byte[] ZeroOutBuffer = new byte[4096];
145 byte[] sendbuffer;
146 sendbuffer = Pack.ToBytes();
147
148 try
149 {
150 if (Pack.Header.Zerocoded)
151 {
152 int packetsize = Helpers.ZeroEncode(sendbuffer, sendbuffer.Length, ZeroOutBuffer);
153 m_networkServer.SendPacketTo(ZeroOutBuffer, packetsize, SocketFlags.None, CircuitCode);//userEP);
154 }
155 else
156 {
157 m_networkServer.SendPacketTo(sendbuffer, sendbuffer.Length, SocketFlags.None, CircuitCode); //userEP);
158 }
159 }
160 catch (Exception)
161 {
162 OpenSim.Framework.Console.MainLog.Instance.Warn("OpenSimClient.cs:ProcessOutPacket() - WARNING: Socket exception occurred on connection " + userEP.ToString() + " - killing thread");
163 this.KillThread();
164 }
165
166 }
167
168 public virtual void InPacket(Packet NewPack)
169 {
170 // Handle appended ACKs
171 if (NewPack.Header.AppendedAcks)
172 {
173 lock (NeedAck)
174 {
175 foreach (uint ack in NewPack.Header.AckList)
176 {
177 NeedAck.Remove(ack);
178 }
179 }
180 }
181
182 // Handle PacketAck packets
183 if (NewPack.Type == PacketType.PacketAck)
184 {
185 PacketAckPacket ackPacket = (PacketAckPacket)NewPack;
186
187 lock (NeedAck)
188 {
189 foreach (PacketAckPacket.PacketsBlock block in ackPacket.Packets)
190 {
191 NeedAck.Remove(block.ID);
192 }
193 }
194 }
195 else if ((NewPack.Type == PacketType.StartPingCheck))
196 {
197 //reply to pingcheck
198 libsecondlife.Packets.StartPingCheckPacket startPing = (libsecondlife.Packets.StartPingCheckPacket)NewPack;
199 libsecondlife.Packets.CompletePingCheckPacket endPing = new CompletePingCheckPacket();
200 endPing.PingID.PingID = startPing.PingID.PingID;
201 OutPacket(endPing);
202 }
203 else
204 {
205 QueItem item = new QueItem();
206 item.Packet = NewPack;
207 item.Incoming = true;
208 this.PacketQueue.Enqueue(item);
209 }
210
211 }
212
213 public virtual void OutPacket(Packet NewPack)
214 {
215 QueItem item = new QueItem();
216 item.Packet = NewPack;
217 item.Incoming = false;
218 this.PacketQueue.Enqueue(item);
219 }
220
221 # region Low Level Packet Methods
222
223 protected void ack_pack(Packet Pack)
224 {
225 if (Pack.Header.Reliable)
226 {
227 libsecondlife.Packets.PacketAckPacket ack_it = new PacketAckPacket();
228 ack_it.Packets = new PacketAckPacket.PacketsBlock[1];
229 ack_it.Packets[0] = new PacketAckPacket.PacketsBlock();
230 ack_it.Packets[0].ID = Pack.Header.Sequence;
231 ack_it.Header.Reliable = false;
232
233 OutPacket(ack_it);
234
235 }
236 /*
237 if (Pack.Header.Reliable)
238 {
239 lock (PendingAcks)
240 {
241 uint sequence = (uint)Pack.Header.Sequence;
242 if (!PendingAcks.ContainsKey(sequence)) { PendingAcks[sequence] = sequence; }
243 }
244 }*/
245 }
246
247 protected void ResendUnacked()
248 {
249 int now = Environment.TickCount;
250
251 lock (NeedAck)
252 {
253 foreach (Packet packet in NeedAck.Values)
254 {
255 if ((now - packet.TickCount > RESEND_TIMEOUT) && (!packet.Header.Resent))
256 {
257 OpenSim.Framework.Console.MainLog.Instance.Verbose( "Resending " + packet.Type.ToString() + " packet, " +
258 (now - packet.TickCount) + "ms have passed");
259
260 packet.Header.Resent = true;
261 OutPacket(packet);
262 }
263 }
264 }
265 }
266
267 protected void SendAcks()
268 {
269 lock (PendingAcks)
270 {
271 if (PendingAcks.Count > 0)
272 {
273 if (PendingAcks.Count > 250)
274 {
275 // FIXME: Handle the odd case where we have too many pending ACKs queued up
276 OpenSim.Framework.Console.MainLog.Instance.Verbose( "Too many ACKs queued up!");
277 return;
278 }
279
280 //OpenSim.Framework.Console.MainLog.Instance.WriteLine("Sending PacketAck");
281
282
283 int i = 0;
284 PacketAckPacket acks = new PacketAckPacket();
285 acks.Packets = new PacketAckPacket.PacketsBlock[PendingAcks.Count];
286
287 foreach (uint ack in PendingAcks.Values)
288 {
289 acks.Packets[i] = new PacketAckPacket.PacketsBlock();
290 acks.Packets[i].ID = ack;
291 i++;
292 }
293
294 acks.Header.Reliable = false;
295 OutPacket(acks);
296
297 PendingAcks.Clear();
298 }
299 }
300 }
301
302 protected void AckTimer_Elapsed(object sender, ElapsedEventArgs ea)
303 {
304 SendAcks();
305 ResendUnacked();
306 }
307 #endregion
308
309 protected virtual void KillThread()
310 {
311
312 }
313
314 #region Nested Classes
315
316 public class QueItem
317 {
318 public QueItem()
319 {
320 }
321
322 public Packet Packet;
323 public bool Incoming;
324 }
325 #endregion
326 }
327}
generated by cgit v1.1 at 2024-11-14 10:16:39 +0000