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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* joris.guisson@gmail.com *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program 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 General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#ifndef BTPEERDOWNLOADER_H
#define BTPEERDOWNLOADER_H
#include <set>
#include <qvaluelist.h>
#include <qobject.h>
#include "globals.h"
#include "request.h"
namespace bt
{
class Peer;
class Request;
class Piece;
typedef std::set<Uint32> AllowedFastSet;
/**
* Request with a timestamp.
*/
struct TimeStampedRequest
{
Request req;
TimeStamp time_stamp;
TimeStampedRequest();
/**
* Constructor, set the request and calculate the timestamp.
* @param r The Request
*/
TimeStampedRequest(const Request & r);
/**
* Copy constructor, copy the request and the timestamp
* @param r The Request
*/
TimeStampedRequest(const TimeStampedRequest & t);
/**
* Equality operator, compares requests only.
* @param r The Request
* @return true if equal
*/
bool operator == (const Request & r);
/**
* Equality operator, compares requests only.
* @param r The Request
* @return true if equal
*/
bool operator == (const TimeStampedRequest & r);
/**
* Assignment operator.
* @param r The Request to copy
* @return *this
*/
TimeStampedRequest & operator = (const Request & r);
/**
* Assignment operator.
* @param r The TimeStampedRequest to copy
* @return *this
*/
TimeStampedRequest & operator = (const TimeStampedRequest & r);
};
/**
* @author Joris Guisson
* @brief Class which downloads pieces from a Peer
*
* This class downloads Piece's from a Peer.
*/
class PeerDownloader : public QObject
{
Q_OBJECT
public:
/**
* Constructor, set the Peer
* @param peer The Peer
* @param chunk_size Size of a chunk in bytes
*/
PeerDownloader(Peer* peer,Uint32 chunk_size);
virtual ~PeerDownloader();
/// See if we can add a request to the wait_queue
bool canAddRequest() const;
/// Get the number of active requests
Uint32 getNumRequests() const;
/// Is the Peer choked.
bool isChoked() const;
/// Is NULL (is the Peer set)
bool isNull() const {return peer == 0;}
/**
* See if the Peer has a Chunk
* @param idx The Chunk's index
*/
bool hasChunk(Uint32 idx) const;
/// See if this PeerDownloader has nearly finished a chunk
bool isNearlyDone() const {return grabbed == 1 && nearly_done;}
/// Set the nearly done status of the PeerDownloader
void setNearlyDone(bool nd) {nearly_done = nd;}
/**
* Grab the Peer, indicates how many ChunkDownload's
* are using this PeerDownloader.
* @return The number of times this PeerDownloader was grabbed
*/
int grab();
/**
* When a ChunkDownload is ready with this PeerDownloader,
* it will release it, so that others can use it.
*/
void release();
/// Get the number of times this PeerDownloader was grabbed.
int getNumGrabbed() const {return grabbed;}
/// Get the Peer
const Peer* getPeer() const {return peer;}
/// Get the current download rate
Uint32 getDownloadRate() const;
/**
* Check for timed out requests.
*/
void checkTimeouts();
/// Get the maximum number of chunk downloads
Uint32 getMaxChunkDownloads() const;
/**
* The peer has been choked, all pending requests are rejected.
* (except for allowed fast ones)
*/
void choked();
public slots:
/**
* Send a Request. Note that the DownloadCap
* may not allow this. (In which case it will
* be stored temporarely in the unsent_reqs list)
* @param req The Request
*/
void download(const Request & req);
/**
* Cancel a Request.
* @param req The Request
*/
void cancel(const Request & req);
/**
* Cancel all Requests
*/
void cancelAll();
/**
* Handles a rejected request.
* @param req
*/
void onRejected(const Request & req);
private slots:
void piece(const Piece & p);
void peerDestroyed();
void update();
signals:
/**
* Emited when a Piece has been downloaded.
* @param p The Piece
*/
void downloaded(const Piece & p);
/**
* Emitted when a request takes longer then 60 seconds to download.
* The sender of the request will have to request it again. This does not apply for
* unsent requests. Their timestamps will be updated when they get transmitted.
* @param r The request
*/
void timedout(const Request & r);
/**
* A request was rejected.
* @param req The Request
*/
void rejected(const Request & req);
private:
Peer* peer;
QValueList<TimeStampedRequest> reqs;
QValueList<Request> wait_queue;
Uint32 max_wait_queue_size;
int grabbed;
Uint32 chunk_size;
bool nearly_done;
};
}
#endif
|
