1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
/**
* @file llpacketring.h
* @brief definition of LLPacketRing class for implementing a resend,
* drop, or delay in packet transmissions
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#pragma once
#include <vector>
#include "llhost.h"
#include "llpacketbuffer.h"
#include "llthrottle.h"
class LLPacketRing
{
public:
LLPacketRing();
~LLPacketRing();
// receive one packet: either buffered or from the socket
S32 receivePacket (S32 socket, char *datap);
// send one packet
bool sendPacket(int h_socket, const char * send_buffer, S32 buf_size, LLHost host);
// drains packets from socket and returns final mNumBufferedPackets
S32 drainSocket(S32 socket);
void dropPackets(U32);
void setDropPercentage (F32 percent_to_drop);
inline LLHost getLastSender() const;
inline LLHost getLastReceivingInterface() const;
S32 getActualInBytes() const { return mActualBytesIn; }
S32 getActualOutBytes() const { return mActualBytesOut; }
S32 getAndResetActualInBits() { S32 bits = mActualBytesIn * 8; mActualBytesIn = 0; return bits;}
S32 getAndResetActualOutBits() { S32 bits = mActualBytesOut * 8; mActualBytesOut = 0; return bits;}
S32 getNumBufferedPackets() const { return (S32)(mNumBufferedPackets); }
S32 getNumBufferedBytes() const { return mNumBufferedBytes; }
S32 getNumDroppedPackets() const { return mNumDroppedPacketsTotal + mNumDroppedPackets; }
F32 getBufferLoadRate() const; // from 0 to 4 (0 - empty, 1 - default size is full)
void dumpPacketRingStats();
protected:
// returns 'true' if we should intentionally drop a packet
bool computeDrop();
// returns packet_size of received packet, zero or less if no packet found
S32 receiveOrDropPacket(S32 socket, char *datap, bool drop);
S32 receiveOrDropBufferedPacket(char *datap, bool drop);
// returns packet_size of packet buffered
S32 bufferInboundPacket(S32 socket);
// returns 'true' if ring was expanded
bool expandRing();
protected:
std::vector<LLPacketBuffer*> mPacketRing;
S16 mHeadIndex { 0 };
S16 mNumBufferedPackets { 0 };
S32 mNumDroppedPackets { 0 };
S32 mNumDroppedPacketsTotal { 0 };
S32 mNumBufferedBytes { 0 };
S32 mActualBytesIn { 0 };
S32 mActualBytesOut { 0 };
F32 mDropPercentage { 0.0f }; // % of inbound packets to drop
U32 mPacketsToDrop { 0 }; // drop next inbound n packets
// These are the sender and receiving_interface for the last packet delivered by receivePacket()
LLHost mLastSender;
LLHost mLastReceivingIF;
};
inline LLHost LLPacketRing::getLastSender() const
{
return mLastSender;
}
inline LLHost LLPacketRing::getLastReceivingInterface() const
{
return mLastReceivingIF;
}
|
