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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"
#define INTERVAL_MSEC 100
/***********************************************************************
* 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 ioInitAdd ( tr_torrent_t * );
static int ioInitRemove ( 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;
tor = calloc( 1, sizeof *tor );
if( NULL == tor )
{
*error = TR_EOTHER;
return NULL;
}
/* Parse torrent file */
if( tr_metainfoParseFile( &tor->info, h->tag, path,
TR_FLAG_SAVE & flags ) )
{
*error = TR_EINVALID;
free( tor );
return NULL;
}
return torrentRealInit( h, tor, hash, flags, error );
}
tr_torrent_t *
tr_torrentInitData( tr_handle_t * h, uint8_t * data, size_t size,
uint8_t * hash, int flags, int * error )
{
tr_torrent_t * tor;
tor = calloc( 1, sizeof *tor );
if( NULL == tor )
{
*error = TR_EOTHER;
return NULL;
}
/* Parse torrent file */
if( tr_metainfoParseData( &tor->info, h->tag, data, size,
TR_FLAG_SAVE & flags ) )
{
*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;
tor = calloc( 1, sizeof *tor );
if( NULL == tor )
{
*error = TR_EOTHER;
return NULL;
}
/* Parse torrent file */
if( tr_metainfoParseHash( &tor->info, h->tag, hashStr ) )
{
*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->hasChangedState = -1;
/* 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] );
}
tor->pexDisabled = 0;
/* 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 );
tor->thread = THREAD_EMPTY;
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 );
}
tr_torrentInitFilePieces( tor );
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 );
if ( !tor->ioLoaded )
{
tr_ioLoadResume( tor );
}
}
char * tr_torrentGetFolder( tr_torrent_t * tor )
{
return tor->destination;
}
int tr_torrentDuplicateDownload( tr_torrent_t * tor )
{
tr_torrent_t * current;
/* Check if a torrent with the same name and destination is already active */
for( current = tor->handle->torrentList; current; current = current->next )
{
if( current != tor && current->status != TR_STATUS_PAUSE
&& !strcmp( tor->destination, current->destination )
&& !strcmp( tor->info.name, current->info.name ) )
{
return 1;
}
}
return 0;
}
void tr_torrentStart( tr_torrent_t * tor )
{
/* Join the thread first */
torrentReallyStop( tor );
/* Don't start if a torrent with the same name and destination is already active */
if( tr_torrentDuplicateDownload( tor ) )
{
tor->error = TR_ERROR_IO_DUP_DOWNLOAD;
snprintf( tor->errorString, sizeof( tor->errorString ),
"%s", tr_errorString( TR_ERROR_IO_DUP_DOWNLOAD ) );
return;
}
tr_lockLock( &tor->lock );
tor->downloadedPrev += tor->downloadedCur;
tor->downloadedCur = 0;
tor->uploadedPrev += tor->uploadedCur;
tor->uploadedCur = 0;
tor->status = TR_STATUS_CHECK_WAIT;
tor->error = TR_OK;
tor->tracker = tr_trackerInit( tor );
tor->startDate = tr_date();
tor->die = 0;
tor->thread = THREAD_EMPTY;
tr_lockUnlock( &tor->lock );
ioInitAdd ( tor );
}
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 */
if ( ioInitRemove( tor ) ) /* torrent never got started */
tor->status = TR_STATUS_STOPPED;
else
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 );
if( tor->tracker )
{
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 );
}
void tr_torrentDisablePex( tr_torrent_t * tor, int disable )
{
int ii;
if( TR_FLAG_PRIVATE & tor->info.flags )
{
return;
}
tr_lockLock( &tor->lock );
if( tor->pexDisabled == disable )
{
tr_lockUnlock( &tor->lock );
return;
}
tor->pexDisabled = disable;
for( ii = 0; ii < tor->peerCount; ii++ )
{
tr_peerSetPrivate( tor->peers[ii], disable );
}
tr_lockUnlock( &tor->lock );
}
static int tr_didStateChangeTo ( tr_torrent_t * tor, int status )
{
if( tor->hasChangedState == status )
{
tor->hasChangedState = -1;
return 1;
}
return 0;
}
int tr_getIncomplete( tr_torrent_t * tor )
{
return tr_didStateChangeTo( tor, TR_CP_INCOMPLETE );
}
int tr_getDone( tr_torrent_t * tor )
{
return tr_didStateChangeTo( tor, TR_CP_DONE );
}
int tr_getComplete( tr_torrent_t * tor )
{
return tr_didStateChangeTo( tor, TR_CP_COMPLETE );
}
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->percentDone = tr_cpPercentDone( tor->completion );
s->percentComplete = tr_cpPercentComplete( tor->completion );
s->cpStatus = tr_cpGetStatus( tor->completion );
s->left = tr_cpLeftUntilDone( 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 );
s->startDate = tor->startDate;
s->activityDate = tor->activityDate;
if( s->rateDownload < 0.1 )
{
s->eta = -1;
}
else
{
s->eta = (float) s->left / s->rateDownload / 1024.0;
}
s->uploaded = tor->uploadedCur + tor->uploadedPrev;
s->downloaded = tor->downloadedCur + tor->downloadedPrev;
s->downloadedValid = tr_cpDownloadedValid( tor->completion );
if( s->downloaded == 0 && s->percentDone == 0.0 )
{
s->ratio = TR_RATIO_NA;
}
else
{
s->ratio = (float)s->uploaded
/ (float)MAX(s->downloaded, s->downloadedValid);
}
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_peerClient( 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 UNUSED )
{
if (peers == NULL)
return;
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 );
}
uint64_t
tr_torrentFileBytesCompleted ( const tr_torrent_t * tor, int fileIndex )
{
const tr_file_t * file = &tor->info.files[fileIndex];
const uint64_t firstBlock = file->offset / tor->blockSize;
const uint64_t firstBlockOffset = file->offset % tor->blockSize;
const uint64_t lastOffset = file->length ? (file->length-1) : 0;
const uint64_t lastBlock = (file->offset + lastOffset) / tor->blockSize;
const uint64_t lastBlockOffset = (file->offset + lastOffset) % tor->blockSize;
uint64_t haveBytes = 0;
assert( tor != NULL );
assert( 0<=fileIndex && fileIndex<tor->info.fileCount );
assert( file->offset + file->length <= tor->info.totalSize );
assert( (int)firstBlock < tor->blockCount );
assert( (int)lastBlock < tor->blockCount );
assert( firstBlock <= lastBlock );
assert( tr_blockPiece( firstBlock ) == file->firstPiece );
assert( tr_blockPiece( lastBlock ) == file->lastPiece );
if( firstBlock == lastBlock )
{
if( tr_cpBlockIsComplete( tor->completion, firstBlock ) )
haveBytes += lastBlockOffset + 1 - firstBlockOffset;
}
else
{
uint64_t i;
if( tr_cpBlockIsComplete( tor->completion, firstBlock ) )
haveBytes += tor->blockSize - firstBlockOffset;
for( i=firstBlock+1; i<lastBlock; ++i )
if( tr_cpBlockIsComplete( tor->completion, i ) )
haveBytes += tor->blockSize;
if( tr_cpBlockIsComplete( tor->completion, lastBlock ) )
haveBytes += lastBlockOffset + 1;
}
return haveBytes;
}
float
tr_torrentFileCompletion ( const tr_torrent_t * tor, int fileIndex )
{
const uint64_t c = tr_torrentFileBytesCompleted ( tor, fileIndex );
uint64_t length = tor->info.files[fileIndex].length;
if( !length )
return 1.0;
return (double)c / length;
}
float*
tr_torrentCompletion( tr_torrent_t * tor )
{
int i;
float * f;
tr_lockLock( &tor->lock );
f = calloc ( tor->info.fileCount, sizeof( float ) );
for( i=0; i<tor->info.fileCount; ++i )
f[i] = tr_torrentFileCompletion ( tor, i );
tr_lockUnlock( &tor->lock );
return f;
}
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 );
}
void tr_torrentRemoveFastResume( tr_torrent_t * tor )
{
tr_ioRemoveResume( tor );
}
/***********************************************************************
* tr_torrentClose
***********************************************************************
* Frees memory allocated by tr_torrentInit.
**********************************************************************/
void tr_torrentClose( tr_torrent_t * tor )
{
tr_handle_t * h = tor->handle;
tr_info_t * inf = &tor->info;
/* 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 ||
tor->pexDisabled );
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;
}
/***********************************************************************
* Push a torrent's call to tr_ioInit through a queue in a worker
* thread so that only one torrent can be in checkFiles() at a time.
**********************************************************************/
struct tr_io_init_list_t
{
tr_torrent_t * tor;
struct tr_io_init_list_t * next;
};
static struct tr_io_init_list_t * ioInitQueue = NULL;
static int ioInitWorkerRunning = 0;
static tr_thread_t ioInitThread;
static tr_lock_t* getIOLock( tr_handle_t * h )
{
static tr_lock_t * lock = NULL;
tr_sharedLock( h->shared );
if( lock == NULL )
{
lock = calloc( 1, sizeof( tr_lock_t ) );
tr_lockInit( lock );
}
tr_sharedUnlock( h->shared );
return lock;
}
static void ioInitWorker( void * user_data )
{
tr_handle_t * h = (tr_handle_t*) user_data;
for (;;)
{
char name[32];
/* find the next torrent to process */
tr_torrent_t * tor = NULL;
tr_lock_t * lock = getIOLock( h );
tr_lockLock( lock );
if( ioInitQueue != NULL )
{
struct tr_io_init_list_t * node = ioInitQueue;
ioInitQueue = node->next;
tor = node->tor;
free( node );
}
tr_lockUnlock( lock );
/* if no torrents, this worker thread is done */
if( tor == NULL )
{
break;
}
/* check this torrent's files */
tor->status = TR_STATUS_CHECK;
tr_dbg( "torrent %s checking files", tor->info.name );
tr_lockLock( &tor->lock );
tr_cpReset( tor->completion );
tor->io = tr_ioInit( tor );
tr_lockUnlock( &tor->lock );
snprintf( name, sizeof( name ), "torrent %p", tor );
tr_threadCreate( &tor->thread, downloadLoop, tor, name );
}
ioInitWorkerRunning = 0;
}
/* add tor to the queue of torrents waiting for an tr_ioInit */
static void ioInitAdd( tr_torrent_t * tor )
{
tr_lock_t * lock = getIOLock( tor->handle );
struct tr_io_init_list_t * node;
tr_lockLock( lock );
/* enqueue this torrent to have its io initialized */
node = malloc( sizeof( struct tr_io_init_list_t ) );
node->tor = tor;
node->next = NULL;
if( ioInitQueue == NULL )
{
ioInitQueue = node;
}
else
{
struct tr_io_init_list_t * l = ioInitQueue;
while( l->next != NULL )
{
l = l->next;
}
l->next = node;
}
/* ensure there's a worker thread to process the queue */
if( !ioInitWorkerRunning )
{
ioInitWorkerRunning = 1;
tr_threadCreate( &ioInitThread, ioInitWorker, tor->handle, "ioInit" );
}
tr_lockUnlock( lock );
}
/* remove tor from the queue of torrents waiting for an tr_ioInit.
return nonzero if tor was found and removed */
static int ioInitRemove( tr_torrent_t * tor )
{
tr_lock_t * lock = getIOLock( tor->handle );
struct tr_io_init_list_t *node, *prev;
tr_lockLock( lock );
/* find tor's node */
for( prev = NULL, node = ioInitQueue;
node != NULL && node->tor != tor;
prev=node, node=node->next );
if( node != NULL )
{
if( prev == NULL )
{
ioInitQueue = node->next;
}
else
{
prev->next = node->next;
}
}
tr_lockUnlock( lock );
return node != NULL;
}
/***********************************************************************
* downloadLoop
**********************************************************************/
static void downloadLoop( void * _tor )
{
tr_torrent_t * tor = _tor;
int i, ret;
int peerCount, used;
cp_status_t cpState, cpPrevState;
uint8_t * peerCompact;
tr_peer_t * peer;
tr_lockLock( &tor->lock );
cpState = cpPrevState = tr_cpGetStatus( tor->completion );
switch( cpState ) {
case TR_CP_COMPLETE: tor->status = TR_STATUS_SEED; break;
case TR_CP_DONE: tor->status = TR_STATUS_DONE; break;
case TR_CP_INCOMPLETE: tor->status = TR_STATUS_DOWNLOAD; break;
}
while( !tor->die )
{
tr_lockUnlock( &tor->lock );
tr_wait( INTERVAL_MSEC );
tr_lockLock( &tor->lock );
cpState = tr_cpGetStatus( tor->completion );
if( cpState != cpPrevState )
{
switch( cpState ) {
case TR_CP_COMPLETE: tor->status = TR_STATUS_SEED; break;
case TR_CP_DONE: tor->status = TR_STATUS_DONE; break;
case TR_CP_INCOMPLETE: tor->status = TR_STATUS_DOWNLOAD; break;
}
tor->hasChangedState = cpState;
if( cpState == TR_CP_COMPLETE )
tr_trackerCompleted( tor->tracker );
tr_ioSync( tor->io );
cpPrevState = cpState;
}
/* 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;
}
/***
****
**** File prioritization
****
***/
static int
getBytePiece( const tr_info_t * info, uint64_t byteOffset )
{
assert( info != NULL );
assert( info->pieceSize != 0 );
return byteOffset / info->pieceSize;
}
static void
initFilePieces ( tr_info_t * info, int fileIndex )
{
tr_file_t * file = &info->files[fileIndex];
uint64_t firstByte, lastByte;
assert( info != NULL );
assert( 0<=fileIndex && fileIndex<info->fileCount );
file = &info->files[fileIndex];
firstByte = file->offset;
lastByte = firstByte + (file->length ? file->length-1 : 0);
file->firstPiece = getBytePiece( info, firstByte );
file->lastPiece = getBytePiece( info, lastByte );
tr_dbg( "file #%d is in pieces [%d...%d] (%s)", fileIndex, file->firstPiece, file->lastPiece, file->name );
}
static tr_priority_t
calculatePiecePriority ( const tr_torrent_t * tor,
int piece )
{
int i;
tr_priority_t priority = TR_PRI_DND;
for( i=0; i<tor->info.fileCount; ++i )
{
const tr_file_t * file = &tor->info.files[i];
if ( file->firstPiece <= piece
&& file->lastPiece >= piece
&& file->priority > priority)
priority = file->priority;
}
return priority;
}
void
tr_torrentInitFilePieces( tr_torrent_t * tor )
{
int i;
uint64_t offset = 0;
assert( tor != NULL );
for( i=0; i<tor->info.fileCount; ++i ) {
tor->info.files[i].offset = offset;
offset += tor->info.files[i].length;
initFilePieces( &tor->info, i );
}
for( i=0; i<tor->info.pieceCount; ++i )
tor->info.pieces[i].priority = calculatePiecePriority( tor, i );
}
void
tr_torrentSetFilePriority( tr_torrent_t * tor,
int fileIndex,
tr_priority_t priority )
{
int i;
tr_file_t * file;
assert( tor != NULL );
assert( 0<=fileIndex && fileIndex<tor->info.fileCount );
assert( priority==TR_PRI_LOW || priority==TR_PRI_NORMAL
|| priority==TR_PRI_HIGH || priority==TR_PRI_DND );
file = &tor->info.files[fileIndex];
file->priority = priority;
for( i=file->firstPiece; i<=file->lastPiece; ++i )
tor->info.pieces[i].priority = calculatePiecePriority( tor, i );
tr_dbg ( "Setting file #%d (pieces %d-%d) priority to %d (%s)",
fileIndex, file->firstPiece, file->lastPiece,
priority, tor->info.files[fileIndex].name );
}
tr_priority_t
tr_torrentGetFilePriority( const tr_torrent_t * tor, int file )
{
assert( tor != NULL );
assert( 0<=file && file<tor->info.fileCount );
return tor->info.files[file].priority;
}
void
tr_torrentSetFilePriorities( tr_torrent_t * tor,
const tr_priority_t * filePriorities )
{
int i;
for( i=0; i<tor->info.pieceCount; ++i )
tr_torrentSetFilePriority( tor, i, filePriorities[i] );
}
tr_priority_t*
tr_torrentGetFilePriorities( const tr_torrent_t * tor )
{
int i;
tr_priority_t * p = malloc( tor->info.fileCount * sizeof(tr_priority_t) );
for( i=0; i<tor->info.fileCount; ++i )
p[i] = tor->info.files[i].priority;
return p;
}
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