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485 lines
11 KiB
485 lines
11 KiB
/***************************************************************************
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* Copyright (C) 2005 by Joris Guisson *
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* joris.guisson@gmail.com *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
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***************************************************************************/
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#include <algorithm>
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#include <util/file.h>
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#include <util/log.h>
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#include <util/array.h>
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#include "chunkdownload.h"
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#include "downloader.h"
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#include "chunk.h"
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#include "peer.h"
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#include "peermanager.h"
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#include "piece.h"
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#include "peerdownloader.h"
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#include <tdelocale.h>
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namespace bt
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{
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class DownloadStatus : public std::set<Uint32>
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{
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public:
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// typedef std::set<Uint32>::iterator iterator;
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DownloadStatus()
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{
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}
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~DownloadStatus()
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{
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}
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void add(Uint32 p)
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{
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insert(p);
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}
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void remove(Uint32 p)
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{
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erase(p);
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}
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bool contains(Uint32 p)
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{
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return count(p) > 0;
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}
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};
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ChunkDownload::ChunkDownload(Chunk* chunk) : chunk(chunk)
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{
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num = num_downloaded = 0;
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num = chunk->getSize() / MAX_PIECE_LEN;
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if (chunk->getSize() % MAX_PIECE_LEN != 0)
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{
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last_size = chunk->getSize() % MAX_PIECE_LEN;
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num++;
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}
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else
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{
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last_size = MAX_PIECE_LEN;
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}
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pieces = BitSet(num);
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pieces.clear();
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for (Uint32 i = 0;i < num;i++)
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piece_queue.append(i);
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dstatus.setAutoDelete(true);
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chunk->ref();
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num_pieces_in_hash = 0;
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if (usingContinuousHashing())
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hash_gen.start();
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}
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ChunkDownload::~ChunkDownload()
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{
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chunk->unref();
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}
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bool ChunkDownload::piece(const Piece & p,bool & ok)
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{
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ok = false;
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timer.update();
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Uint32 pp = p.getOffset() / MAX_PIECE_LEN;
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if (pieces.get(pp))
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return false;
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DownloadStatus* ds = dstatus.find(p.getPeer());
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if (ds)
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ds->remove(pp);
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Uint8* buf = chunk->getData();
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if (buf)
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{
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ok = true;
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memcpy(buf + p.getOffset(),p.getData(),p.getLength());
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pieces.set(pp,true);
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piece_queue.remove(pp);
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piece_providers.insert(p.getPeer());
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num_downloaded++;
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if (pdown.count() > 1)
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{
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endgameCancel(p);
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}
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if (usingContinuousHashing())
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updateHash();
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if (num_downloaded >= num)
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{
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// finalize hash
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if (usingContinuousHashing())
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hash_gen.end();
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releaseAllPDs();
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return true;
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}
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}
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for (TQPtrList<PeerDownloader>::iterator i = pdown.begin();i != pdown.end();++i)
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sendRequests(*i);
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return false;
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}
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void ChunkDownload::releaseAllPDs()
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{
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for (Uint32 i = 0;i < pdown.count();i++)
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{
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PeerDownloader* pd = pdown.at(i);
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pd->release();
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disconnect(pd,TQ_SIGNAL(timedout(const Request& )),this,TQ_SLOT(onTimeout(const Request& )));
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disconnect(pd,TQ_SIGNAL(rejected( const Request& )),this,TQ_SLOT(onRejected( const Request& )));
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}
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dstatus.clear();
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pdown.clear();
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}
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bool ChunkDownload::assignPeer(PeerDownloader* pd)
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{
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if (!pd || pdown.contains(pd))
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return false;
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pd->grab();
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pdown.append(pd);
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dstatus.insert(pd->getPeer()->getID(),new DownloadStatus());
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sendRequests(pd);
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connect(pd,TQ_SIGNAL(timedout(const Request& )),this,TQ_SLOT(onTimeout(const Request& )));
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connect(pd,TQ_SIGNAL(rejected( const Request& )),this,TQ_SLOT(onRejected( const Request& )));
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return true;
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}
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void ChunkDownload::notDownloaded(const Request & r,bool reject)
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{
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// find the peer
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DownloadStatus* ds = dstatus.find(r.getPeer());
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if (ds)
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{
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// Out() << "ds != 0" << endl;
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Uint32 p = r.getOffset() / MAX_PIECE_LEN;
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ds->remove(p);
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}
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// go over all PD's and do requets again
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for (TQPtrList<PeerDownloader>::iterator i = pdown.begin();i != pdown.end();++i)
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sendRequests(*i);
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}
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void ChunkDownload::onRejected(const Request & r)
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{
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if (chunk->getIndex() == r.getIndex())
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{
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// Out(SYS_CON|LOG_DEBUG) << TQString("Request rejected %1 %2 %3 %4").arg(r.getIndex()).arg(r.getOffset()).arg(r.getLength()).arg(r.getPeer()) << endl;
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notDownloaded(r,true);
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}
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}
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void ChunkDownload::onTimeout(const Request & r)
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{
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// see if we are dealing with a piece of ours
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if (chunk->getIndex() == r.getIndex())
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{
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Out(SYS_CON|LOG_DEBUG) << TQString("Request timed out %1 %2 %3 %4").arg(r.getIndex()).arg(r.getOffset()).arg(r.getLength()).arg(r.getPeer()) << endl;
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notDownloaded(r,false);
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}
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}
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void ChunkDownload::sendRequests(PeerDownloader* pd)
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{
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timer.update();
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DownloadStatus* ds = dstatus.find(pd->getPeer()->getID());
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if (!ds)
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return;
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// if the peer is choked and we are not downloading an allowed fast chunk
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if (pd->isChoked())
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return;
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Uint32 num_visited = 0;
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while (num_visited < piece_queue.count() && pd->canAddRequest())
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{
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// get the first one in the queue
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Uint32 i = piece_queue.first();
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if (!ds->contains(i))
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{
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// send request
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pd->download(
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Request(
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chunk->getIndex(),
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i*MAX_PIECE_LEN,
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i+1<num ? MAX_PIECE_LEN : last_size,
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pd->getPeer()->getID()));
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ds->add(i);
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}
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// move to the back so that it will take a while before it's turn is up
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piece_queue.pop_front();
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piece_queue.append(i);
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num_visited++;
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}
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if (piece_queue.count() < 2 && piece_queue.count() > 0)
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pd->setNearlyDone(true);
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}
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void ChunkDownload::update()
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{
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// go over all PD's and do requets again
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for (TQPtrList<PeerDownloader>::iterator i = pdown.begin();i != pdown.end();++i)
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sendRequests(*i);
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}
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void ChunkDownload::sendCancels(PeerDownloader* pd)
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{
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DownloadStatus* ds = dstatus.find(pd->getPeer()->getID());
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if (!ds)
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return;
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DownloadStatus::iterator itr = ds->begin();
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while (itr != ds->end())
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{
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Uint32 i = *itr;
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pd->cancel(
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Request(
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chunk->getIndex(),
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i*MAX_PIECE_LEN,
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i+1<num ? MAX_PIECE_LEN : last_size,0));
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itr++;
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}
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ds->clear();
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timer.update();
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}
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void ChunkDownload::endgameCancel(const Piece & p)
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{
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TQPtrList<PeerDownloader>::iterator i = pdown.begin();
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while (i != pdown.end())
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{
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PeerDownloader* pd = *i;
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DownloadStatus* ds = dstatus.find(pd->getPeer()->getID());
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Uint32 pp = p.getOffset() / MAX_PIECE_LEN;
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if (ds && ds->contains(pp))
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{
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pd->cancel(Request(p));
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ds->remove(pp);
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}
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i++;
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}
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}
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void ChunkDownload::peerKilled(PeerDownloader* pd)
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{
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if (!pdown.contains(pd))
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return;
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dstatus.erase(pd->getPeer()->getID());
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pdown.remove(pd);
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disconnect(pd,TQ_SIGNAL(timedout(const Request& )),this,TQ_SLOT(onTimeout(const Request& )));
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disconnect(pd,TQ_SIGNAL(rejected( const Request& )),this,TQ_SLOT(onRejected( const Request& )));
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}
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const Peer* ChunkDownload::getCurrentPeer() const
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{
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if (pdown.count() == 0)
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return 0;
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else
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return pdown.getFirst()->getPeer();
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}
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Uint32 ChunkDownload::getChunkIndex() const
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{
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return chunk->getIndex();
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}
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TQString ChunkDownload::getCurrentPeerID() const
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{
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if (pdown.count() == 0)
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{
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return TQString();
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}
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else if (pdown.count() == 1)
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{
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const Peer* p = pdown.getFirst()->getPeer();
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return p->getPeerID().identifyClient();
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}
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else
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{
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return i18n("1 peer","%n peers",pdown.count());
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}
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}
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Uint32 ChunkDownload::getDownloadSpeed() const
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{
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Uint32 r = 0;
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TQPtrList<PeerDownloader>::const_iterator i = pdown.begin();
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while (i != pdown.end())
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{
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const PeerDownloader* pd = *i;
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r += pd->getPeer()->getDownloadRate();
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i++;
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}
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return r;
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}
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void ChunkDownload::save(File & file)
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{
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ChunkDownloadHeader hdr;
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hdr.index = chunk->getIndex();
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hdr.num_bits = pieces.getNumBits();
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hdr.buffered = chunk->getStatus() == Chunk::BUFFERED ? 1 : 0;
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// save the chunk header
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file.write(&hdr,sizeof(ChunkDownloadHeader));
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// save the bitset
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file.write(pieces.getData(),pieces.getNumBytes());
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if (hdr.buffered)
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{
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// if it's a buffered chunk, save the contents to
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file.write(chunk->getData(),chunk->getSize());
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chunk->clear();
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chunk->setStatus(Chunk::ON_DISK);
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}
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}
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bool ChunkDownload::load(File & file,ChunkDownloadHeader & hdr)
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{
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// read pieces
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if (hdr.num_bits != num)
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return false;
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pieces = BitSet(hdr.num_bits);
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Array<Uint8> data(pieces.getNumBytes());
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file.read(data,pieces.getNumBytes());
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pieces = BitSet(data,hdr.num_bits);
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num_downloaded = pieces.numOnBits();
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if (hdr.buffered)
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{
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// if it's a buffered chunk, load the data to
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if (file.read(chunk->getData(),chunk->getSize()) != chunk->getSize())
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return false;
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}
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for (Uint32 i = 0;i < pieces.getNumBits();i++)
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if (pieces.get(i))
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piece_queue.remove(i);
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updateHash();
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return true;
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}
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Uint32 ChunkDownload::bytesDownloaded() const
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{
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Uint32 num_bytes = 0;
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for (Uint32 i = 0;i < num;i++)
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{
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if (pieces.get(i))
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{
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num_bytes += i == num-1 ? last_size : MAX_PIECE_LEN;
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}
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}
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return num_bytes;
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}
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void ChunkDownload::cancelAll()
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{
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TQPtrList<PeerDownloader>::iterator i = pdown.begin();
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while (i != pdown.end())
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{
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sendCancels(*i);
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i++;
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}
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}
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bool ChunkDownload::getOnlyDownloader(Uint32 & pid)
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{
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if (piece_providers.size() == 1)
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{
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pid = *piece_providers.begin();
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return true;
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}
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else
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{
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return false;
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}
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}
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void ChunkDownload::getStats(Stats & s)
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{
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s.chunk_index = chunk->getIndex();
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s.current_peer_id = getCurrentPeerID();
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s.download_speed = getDownloadSpeed();
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s.num_downloaders = getNumDownloaders();
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s.pieces_downloaded = num_downloaded;
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s.total_pieces = num;
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}
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bool ChunkDownload::isChoked() const
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{
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TQPtrList<PeerDownloader>::const_iterator i = pdown.begin();
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while (i != pdown.end())
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{
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const PeerDownloader* pd = *i;
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// if there is one which isn't choked
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if (!pd->isChoked())
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return false;
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i++;
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}
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return true;
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}
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void ChunkDownload::updateHash()
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{
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// update the hash until where we can
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Uint32 nn = num_pieces_in_hash;
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while (pieces.get(nn) && nn < num)
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nn++;
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for (Uint32 i = num_pieces_in_hash;i < nn;i++)
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{
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const Uint8* data = chunk->getData() + i * MAX_PIECE_LEN;
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hash_gen.update(data,i == num - 1 ? last_size : MAX_PIECE_LEN);
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}
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num_pieces_in_hash = nn;
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}
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bool ChunkDownload::usingContinuousHashing() const
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{
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// if the pieces are larger then 1 MB we will be using the continuous hashing feature
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return pieces.getNumBits() > 64;
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}
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}
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#include "chunkdownload.moc"
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