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transmission/libtransmission/torrent.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2005-2007 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include "transmission.h"
#include "shared.h"
/***********************************************************************
* Local prototypes
**********************************************************************/
static tr_torrent_t * torrentRealInit( tr_handle_t *, tr_torrent_t * tor,
uint8_t *, int flags, int * error );
static void torrentReallyStop( tr_torrent_t * );
static void downloadLoop( void * );
void tr_setUseCustomUpload( tr_torrent_t * tor, int limit )
{
tor->customUploadLimit = limit;
}
void tr_setUseCustomDownload( tr_torrent_t * tor, int limit )
{
tor->customDownloadLimit = limit;
}
void tr_setUploadLimit( tr_torrent_t * tor, int limit )
{
tr_rcSetLimit( tor->upload, limit );
}
void tr_setDownloadLimit( tr_torrent_t * tor, int limit )
{
tr_rcSetLimit( tor->download, limit );
}
tr_torrent_t * tr_torrentInit( tr_handle_t * h, const char * path,
uint8_t * hash, int flags, int * error )
{
tr_torrent_t * tor = calloc( sizeof( tr_torrent_t ), 1 );
int saveCopy = ( TR_FLAG_SAVE & flags );
/* Parse torrent file */
if( tr_metainfoParse( &tor->info, h->tag, path, NULL, saveCopy ) )
{
*error = TR_EINVALID;
free( tor );
return NULL;
}
return torrentRealInit( h, tor, hash, flags, error );
}
tr_torrent_t * tr_torrentInitSaved( tr_handle_t * h, const char * hashStr,
int flags, int * error )
{
tr_torrent_t * tor = calloc( sizeof( tr_torrent_t ), 1 );
/* Parse torrent file */
if( tr_metainfoParse( &tor->info, h->tag, NULL, hashStr, 0 ) )
{
*error = TR_EINVALID;
free( tor );
return NULL;
}
return torrentRealInit( h, tor, NULL, ( TR_FLAG_SAVE | flags ), error );
}
/***********************************************************************
* tr_torrentInit
***********************************************************************
* Allocates a tr_torrent_t structure, then relies on tr_metainfoParse
* to fill it.
**********************************************************************/
static tr_torrent_t * torrentRealInit( tr_handle_t * h, tr_torrent_t * tor,
uint8_t * hash, int flags, int * error )
{
tr_torrent_t * tor_tmp;
tr_info_t * inf;
int i;
inf = &tor->info;
inf->flags |= flags;
tr_sharedLock( h->shared );
/* Make sure this torrent is not already open */
for( tor_tmp = h->torrentList; tor_tmp; tor_tmp = tor_tmp->next )
{
if( !memcmp( tor->info.hash, tor_tmp->info.hash,
SHA_DIGEST_LENGTH ) )
{
if( NULL != hash )
{
memcpy( hash, tor->info.hash, SHA_DIGEST_LENGTH );
}
*error = TR_EDUPLICATE;
tr_metainfoFree( &tor->info );
free( tor );
tr_sharedUnlock( h->shared );
return NULL;
}
}
tor->handle = h;
tor->status = TR_STATUS_PAUSE;
tor->id = h->id;
tor->key = h->key;
tor->azId = h->azId;
tor->finished = 0;
/* Escaped info hash for HTTP queries */
for( i = 0; i < SHA_DIGEST_LENGTH; i++ )
{
snprintf( &tor->escapedHashString[3*i],
sizeof( tor->escapedHashString ) - 3 * i,
"%%%02x", inf->hash[i] );
}
/* Block size: usually 16 ko, or less if we have to */
tor->blockSize = MIN( inf->pieceSize, 1 << 14 );
tor->blockCount = ( inf->totalSize + tor->blockSize - 1 ) /
tor->blockSize;
tor->completion = tr_cpInit( tor );
tr_lockInit( &tor->lock );
tr_condInit( &tor->cond );
tor->upload = tr_rcInit();
tor->download = tr_rcInit();
tor->swarmspeed = tr_rcInit();
/* We have a new torrent */
tor->publicPort = tr_sharedGetPublicPort( h->shared );
tor->prev = NULL;
tor->next = h->torrentList;
if( tor->next )
{
tor->next->prev = tor;
}
h->torrentList = tor;
(h->torrentCount)++;
tr_sharedUnlock( h->shared );
if( !h->isPortSet )
{
tr_setBindPort( h, TR_DEFAULT_PORT );
}
return tor;
}
tr_info_t * tr_torrentInfo( tr_torrent_t * tor )
{
return &tor->info;
}
/***********************************************************************
* tr_torrentScrape
**********************************************************************/
int tr_torrentScrape( tr_torrent_t * tor, int * s, int * l, int * d )
{
return tr_trackerScrape( tor, s, l, d );
}
void tr_torrentSetFolder( tr_torrent_t * tor, const char * path )
{
tor->destination = strdup( path );
tr_ioLoadResume( tor );
}
char * tr_torrentGetFolder( tr_torrent_t * tor )
{
return tor->destination;
}
void tr_torrentStart( tr_torrent_t * tor )
{
char name[32];
if( tor->status & ( TR_STATUS_STOPPING | TR_STATUS_STOPPED ) )
{
/* Join the thread first */
torrentReallyStop( tor );
}
tr_lockLock( &tor->lock );
tor->downloadedPrev += tor->downloadedCur;
tor->downloadedCur = 0;
tor->uploadedPrev += tor->uploadedCur;
tor->uploadedCur = 0;
tor->status = TR_STATUS_CHECK;
tor->error = TR_OK;
tor->tracker = tr_trackerInit( tor );
tor->date = tr_date();
tor->die = 0;
snprintf( name, sizeof( name ), "torrent %p", tor );
tr_lockUnlock( &tor->lock );
tr_threadCreate( &tor->thread, downloadLoop, tor, name );
}
static void torrentStop( tr_torrent_t * tor )
{
tr_trackerStopped( tor->tracker );
tr_rcReset( tor->download );
tr_rcReset( tor->upload );
tr_rcReset( tor->swarmspeed );
tor->status = TR_STATUS_STOPPING;
tor->stopDate = tr_date();
}
void tr_torrentStop( tr_torrent_t * tor )
{
tr_lockLock( &tor->lock );
torrentStop( tor );
/* Don't return until the files are closed, so the UI can trash
* them if requested */
tr_condWait( &tor->cond, &tor->lock );
tr_lockUnlock( &tor->lock );
}
/***********************************************************************
* torrentReallyStop
***********************************************************************
* Joins the download thread and frees/closes everything related to it.
**********************************************************************/
static void torrentReallyStop( tr_torrent_t * tor )
{
int i;
tor->die = 1;
tr_threadJoin( &tor->thread );
tr_trackerClose( tor->tracker );
tor->tracker = NULL;
tr_lockLock( &tor->lock );
for( i = 0; i < tor->peerCount; i++ )
{
tr_peerDestroy( tor->peers[i] );
}
tor->peerCount = 0;
tr_lockUnlock( &tor->lock );
}
int tr_getFinished( tr_torrent_t * tor )
{
if( tor->finished )
{
tor->finished = 0;
return 1;
}
return 0;
}
void tr_manualUpdate( tr_torrent_t * tor )
{
int peerCount, new;
uint8_t * peerCompact;
if( !( tor->status & TR_STATUS_ACTIVE ) )
return;
tr_lockLock( &tor->lock );
tr_trackerAnnouncePulse( tor->tracker, &peerCount, &peerCompact, 1 );
new = 0;
if( peerCount > 0 )
{
new = tr_torrentAddCompact( tor, TR_PEER_FROM_TRACKER,
peerCompact, peerCount );
free( peerCompact );
}
tr_dbg( "got %i peers from manual announce, used %i", peerCount, new );
tr_lockUnlock( &tor->lock );
}
tr_stat_t * tr_torrentStat( tr_torrent_t * tor )
{
tr_stat_t * s;
tr_peer_t * peer;
tr_info_t * inf = &tor->info;
tr_tracker_t * tc;
int i;
tor->statCur = ( tor->statCur + 1 ) % 2;
s = &tor->stats[tor->statCur];
if( ( tor->status & TR_STATUS_STOPPED ) ||
( ( tor->status & TR_STATUS_STOPPING ) &&
tr_date() > tor->stopDate + 60000 ) )
{
torrentReallyStop( tor );
tor->status = TR_STATUS_PAUSE;
}
tr_lockLock( &tor->lock );
s->status = tor->status;
s->error = tor->error;
memcpy( s->errorString, tor->errorString,
sizeof( s->errorString ) );
tc = tor->tracker;
s->cannotConnect = tr_trackerCannotConnect( tc );
s->tracker = ( tc ? tr_trackerGet( tc ) : &inf->trackerList[0].list[0] );
s->peersTotal = 0;
memset( s->peersFrom, 0, sizeof( s->peersFrom ) );
s->peersUploading = 0;
s->peersDownloading = 0;
for( i = 0; i < tor->peerCount; i++ )
{
peer = tor->peers[i];
if( tr_peerIsConnected( peer ) )
{
(s->peersTotal)++;
(s->peersFrom[ tr_peerIsFrom( peer ) ])++;
if( tr_peerAmInterested( peer ) && !tr_peerIsChoking( peer ) )
{
(s->peersUploading)++;
}
if( !tr_peerAmChoking( peer ) )
{
(s->peersDownloading)++;
}
}
}
s->progress = tr_cpCompletionAsFloat( tor->completion );
if( tor->status & TR_STATUS_DOWNLOAD )
{
s->rateDownload = tr_rcRate( tor->download );
}
else
{
/* tr_rcRate() doesn't make the difference between 'piece'
messages and other messages, which causes a non-zero
download rate even tough we are not downloading. So we
force it to zero not to confuse the user. */
s->rateDownload = 0.0;
}
s->rateUpload = tr_rcRate( tor->upload );
s->seeders = tr_trackerSeeders( tc );
s->leechers = tr_trackerLeechers( tc );
s->completedFromTracker = tr_trackerDownloaded( tc );
s->swarmspeed = tr_rcRate( tor->swarmspeed );
if( s->rateDownload < 0.1 )
{
s->eta = -1;
}
else
{
s->eta = ( 1.0 - s->progress ) *
(float) inf->totalSize / s->rateDownload / 1024.0;
}
s->downloaded = tor->downloadedCur + tor->downloadedPrev;
s->uploaded = tor->uploadedCur + tor->uploadedPrev;
if( s->downloaded == 0 )
{
s->ratio = s->uploaded == 0 ? TR_RATIO_NA : TR_RATIO_INF;
}
else
{
s->ratio = (float)s->uploaded / (float)s->downloaded;
}
tr_lockUnlock( &tor->lock );
return s;
}
tr_peer_stat_t * tr_torrentPeers( tr_torrent_t * tor, int * peerCount )
{
tr_peer_stat_t * peers;
tr_lockLock( &tor->lock );
*peerCount = tor->peerCount;
peers = (tr_peer_stat_t *) calloc( tor->peerCount, sizeof( tr_peer_stat_t ) );
if (peers != NULL)
{
tr_peer_t * peer;
struct in_addr * addr;
int i;
for( i = 0; i < tor->peerCount; i++ )
{
peer = tor->peers[i];
addr = tr_peerAddress( peer );
if( NULL != addr )
{
tr_netNtop( addr, peers[i].addr,
sizeof( peers[i].addr ) );
}
peers[i].client = tr_clientForId(tr_peerId(peer));
peers[i].isConnected = tr_peerIsConnected( peer );
peers[i].from = tr_peerIsFrom( peer );
peers[i].progress = tr_peerProgress( peer );
peers[i].port = tr_peerPort( peer );
if( ( peers[i].isDownloading = !tr_peerAmChoking( peer ) ) )
{
peers[i].uploadToRate = tr_peerUploadRate( peer );
}
if( ( peers[i].isUploading = ( tr_peerAmInterested( peer ) &&
!tr_peerIsChoking( peer ) ) ) )
{
peers[i].downloadFromRate = tr_peerDownloadRate( peer );
}
}
}
tr_lockUnlock( &tor->lock );
return peers;
}
void tr_torrentPeersFree( tr_peer_stat_t * peers, int peerCount )
{
int i;
if (peers == NULL)
return;
for (i = 0; i < peerCount; i++)
free( peers[i].client );
free( peers );
}
void tr_torrentAvailability( tr_torrent_t * tor, int8_t * tab, int size )
{
int i, j, piece;
float interval;
tr_lockLock( &tor->lock );
interval = (float)tor->info.pieceCount / (float)size;
for( i = 0; i < size; i++ )
{
piece = i * interval;
if( tr_cpPieceIsComplete( tor->completion, piece ) )
{
tab[i] = -1;
continue;
}
tab[i] = 0;
for( j = 0; j < tor->peerCount; j++ )
{
if( tr_peerBitfield( tor->peers[j] ) &&
tr_bitfieldHas( tr_peerBitfield( tor->peers[j] ), piece ) )
{
(tab[i])++;
}
}
}
tr_lockUnlock( &tor->lock );
}
float * tr_torrentCompletion( tr_torrent_t * tor )
{
tr_info_t * inf = &tor->info;
int piece, file;
float * ret, prog, weight;
uint64_t piecemax, piecesize;
uint64_t filestart, fileoff, filelen, blockend, blockused;
tr_lockLock( &tor->lock );
ret = calloc( inf->fileCount, sizeof( float ) );
file = 0;
piecemax = inf->pieceSize;
filestart = 0;
fileoff = 0;
piece = 0;
while( inf->pieceCount > piece )
{
assert( file < inf->fileCount );
assert( filestart + fileoff < inf->totalSize );
filelen = inf->files[file].length;
piecesize = tr_pieceSize( piece );
blockend = MIN( filestart + filelen, piecemax * piece + piecesize );
blockused = blockend - ( filestart + fileoff );
weight = ( filelen ? ( float )blockused / ( float )filelen : 1.0 );
prog = tr_cpPercentBlocksInPiece( tor->completion, piece );
ret[file] += prog * weight;
fileoff += blockused;
assert( -0.1 < prog && 1.1 > prog );
assert( -0.1 < weight && 1.1 > weight );
if( fileoff == filelen )
{
ret[file] = MIN( 1.0, ret[file] );
ret[file] = MAX( 0.0, ret[file] );
filestart += fileoff;
fileoff = 0;
file++;
}
if( filestart + fileoff >= piecemax * piece + piecesize )
{
piece++;
}
}
tr_lockUnlock( &tor->lock );
return ret;
}
void tr_torrentAmountFinished( tr_torrent_t * tor, float * tab, int size )
{
int i, piece;
float interval;
tr_lockLock( &tor->lock );
interval = (float)tor->info.pieceCount / (float)size;
for( i = 0; i < size; i++ )
{
piece = i * interval;
tab[i] = tr_cpPercentBlocksInPiece( tor->completion, piece );
}
tr_lockUnlock( &tor->lock );
}
void tr_torrentRemoveSaved( tr_torrent_t * tor )
{
tr_metainfoRemoveSaved( tor->info.hashString, tor->handle->tag );
}
/***********************************************************************
* tr_torrentClose
***********************************************************************
* Frees memory allocated by tr_torrentInit.
**********************************************************************/
void tr_torrentClose( tr_handle_t * h, tr_torrent_t * tor )
{
tr_info_t * inf = &tor->info;
if( tor->status & ( TR_STATUS_STOPPING | TR_STATUS_STOPPED ) )
{
/* Join the thread first */
torrentReallyStop( tor );
}
tr_sharedLock( h->shared );
h->torrentCount--;
tr_lockClose( &tor->lock );
tr_condClose( &tor->cond );
tr_cpClose( tor->completion );
tr_rcClose( tor->upload );
tr_rcClose( tor->download );
tr_rcClose( tor->swarmspeed );
if( tor->destination )
{
free( tor->destination );
}
tr_metainfoFree( inf );
if( tor->prev )
{
tor->prev->next = tor->next;
}
else
{
h->torrentList = tor->next;
}
if( tor->next )
{
tor->next->prev = tor->prev;
}
free( tor );
tr_sharedUnlock( h->shared );
}
int tr_torrentAttachPeer( tr_torrent_t * tor, tr_peer_t * peer )
{
int i;
tr_peer_t * otherPeer;
if( tor->peerCount >= TR_MAX_PEER_COUNT )
{
tr_peerDestroy( peer );
return 0;
}
/* Don't accept two connections from the same IP */
for( i = 0; i < tor->peerCount; i++ )
{
otherPeer = tor->peers[i];
if( !memcmp( tr_peerAddress( peer ), tr_peerAddress( otherPeer ), 4 ) )
{
tr_peerDestroy( peer );
return 0;
}
}
tr_peerSetPrivate( peer, tor->info.flags & TR_FLAG_PRIVATE );
tr_peerSetTorrent( peer, tor );
tor->peers[tor->peerCount++] = peer;
return 1;
}
int tr_torrentAddCompact( tr_torrent_t * tor, int from,
uint8_t * buf, int count )
{
struct in_addr addr;
in_port_t port;
int i, added;
tr_peer_t * peer;
added = 0;
for( i = 0; i < count; i++ )
{
memcpy( &addr, buf, 4 ); buf += 4;
memcpy( &port, buf, 2 ); buf += 2;
peer = tr_peerInit( addr, port, -1, from );
added += tr_torrentAttachPeer( tor, peer );
}
return added;
}
/***********************************************************************
* downloadLoop
**********************************************************************/
static void downloadLoop( void * _tor )
{
tr_torrent_t * tor = _tor;
int i, ret;
int peerCount, used;
uint8_t * peerCompact;
tr_peer_t * peer;
tr_lockLock( &tor->lock );
tr_cpReset( tor->completion );
tor->io = tr_ioInit( tor );
tor->status = tr_cpIsSeeding( tor->completion ) ?
TR_STATUS_SEED : TR_STATUS_DOWNLOAD;
while( !tor->die )
{
tr_lockUnlock( &tor->lock );
tr_wait( 20 );
tr_lockLock( &tor->lock );
/* Are we finished ? */
if( ( tor->status & TR_STATUS_DOWNLOAD ) &&
tr_cpIsSeeding( tor->completion ) )
{
/* Done */
tor->status = TR_STATUS_SEED;
tor->finished = 1;
tr_trackerCompleted( tor->tracker );
tr_ioSync( tor->io );
}
/* Try to get new peers or to send a message to the tracker */
tr_trackerPulse( tor->tracker, &peerCount, &peerCompact );
if( peerCount > 0 )
{
used = tr_torrentAddCompact( tor, TR_PEER_FROM_TRACKER,
peerCompact, peerCount );
free( peerCompact );
tr_dbg( "got %i peers from announce, used %i", peerCount, used );
}
if( tor->status & TR_STATUS_STOPPED )
{
break;
}
/* Stopping: make sure all files are closed and stop talking
to peers */
if( tor->status & TR_STATUS_STOPPING )
{
if( tor->io )
{
tr_ioClose( tor->io ); tor->io = NULL;
tr_condSignal( &tor->cond );
}
continue;
}
/* Shuffle peers */
if( tor->peerCount > 1 )
{
peer = tor->peers[0];
memmove( &tor->peers[0], &tor->peers[1],
( tor->peerCount - 1 ) * sizeof( void * ) );
tor->peers[tor->peerCount - 1] = peer;
}
/* Receive/send messages */
for( i = 0; i < tor->peerCount; )
{
peer = tor->peers[i];
ret = tr_peerPulse( peer );
if( ret & TR_ERROR_IO_MASK )
{
tr_err( "Fatal error, stopping download (%d)", ret );
torrentStop( tor );
tor->error = ret;
snprintf( tor->errorString, sizeof( tor->errorString ),
"%s", tr_errorString( ret ) );
break;
}
if( ret )
{
tr_peerDestroy( peer );
tor->peerCount--;
memmove( &tor->peers[i], &tor->peers[i+1],
( tor->peerCount - i ) * sizeof( void * ) );
continue;
}
i++;
}
}
tr_lockUnlock( &tor->lock );
if( tor->io )
{
tr_ioClose( tor->io ); tor->io = NULL;
tr_condSignal( &tor->cond );
}
tor->status = TR_STATUS_STOPPED;
}
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