transmission/libtransmission/transmission.c

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2006-01-12 17:43:21 +00:00
/******************************************************************************
* Copyright (c) 2005 Eric Petit
*
* 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"
/***********************************************************************
* Local prototypes
**********************************************************************/
static void downloadLoop( void * );
static float rateDownload( tr_torrent_t * );
static float rateUpload( tr_torrent_t * );
/***********************************************************************
* tr_init
***********************************************************************
* Allocates a tr_handle_t structure and initializes a few things
**********************************************************************/
tr_handle_t * tr_init()
{
tr_handle_t * h;
int i, r;
h = calloc( sizeof( tr_handle_t ), 1 );
/* Generate a peer id : "-TRxxyy-" + 12 random alphanumeric
characters, where xx is the major version number and yy the
minor version number (Azureus-style) */
sprintf( h->id, "-TR%02d%02d-", VERSION_MAJOR, VERSION_MINOR );
for( i = 8; i < 20; i++ )
{
r = tr_rand( 36 );
h->id[i] = ( r < 26 ) ? ( 'a' + r ) : ( '0' + r - 26 ) ;
}
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/* Random key */
for( i = 0; i < 20; i++ )
{
r = tr_rand( 36 );
h->key[i] = ( r < 26 ) ? ( 'a' + r ) : ( '0' + r - 26 ) ;
}
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/* Don't exit when writing on a broken socket */
signal( SIGPIPE, SIG_IGN );
/* Initialize rate and file descripts controls */
h->upload = tr_uploadInit();
h->fdlimit = tr_fdInit();
h->bindPort = 9090;
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snprintf( h->prefsDirectory, sizeof( h->prefsDirectory ),
"%s/.transmission", getenv( "HOME" ) );
mkdir( h->prefsDirectory, 0755 );
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return h;
}
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/***********************************************************************
* tr_getPrefsDirectory
***********************************************************************
*
**********************************************************************/
char * tr_getPrefsDirectory( tr_handle_t * h )
{
return (char *) h->prefsDirectory;
}
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/***********************************************************************
* tr_setBindPort
***********************************************************************
*
**********************************************************************/
void tr_setBindPort( tr_handle_t * h, int port )
{
/* FIXME multithread safety */
h->bindPort = port;
}
/***********************************************************************
* tr_setUploadLimit
***********************************************************************
*
**********************************************************************/
void tr_setUploadLimit( tr_handle_t * h, int limit )
{
tr_uploadSetLimit( h->upload, limit );
}
/***********************************************************************
* tr_torrentRates
***********************************************************************
*
**********************************************************************/
void tr_torrentRates( tr_handle_t * h, float * dl, float * ul )
{
int i;
tr_torrent_t * tor;
*dl = 0.0;
*ul = 0.0;
for( i = 0; i < h->torrentCount; i++ )
{
tor = h->torrents[i];
tr_lockLock( tor->lock );
*dl += rateDownload( tor );
*ul += rateUpload( tor );
tr_lockUnlock( tor->lock );
}
}
/***********************************************************************
* tr_torrentInit
***********************************************************************
* Allocates a tr_torrent_t structure, then relies on tr_metainfoParse
* to fill it.
**********************************************************************/
int tr_torrentInit( tr_handle_t * h, const char * path )
{
tr_torrent_t * tor;
tr_info_t * inf;
int i;
char * s1, * s2;
if( h->torrentCount >= TR_MAX_TORRENT_COUNT )
{
tr_err( "Maximum number of torrents reached" );
return 1;
}
tor = calloc( sizeof( tr_torrent_t ), 1 );
inf = &tor->info;
/* Parse torrent file */
if( tr_metainfoParse( inf, path ) )
{
free( tor );
return 1;
}
/* Make sure this torrent is not already open */
for( i = 0; i < h->torrentCount; i++ )
{
if( !memcmp( tor->info.hash, h->torrents[i]->info.hash,
SHA_DIGEST_LENGTH ) )
{
tr_err( "Torrent already open" );
free( tor );
return 1;
}
}
tor->status = TR_STATUS_PAUSE;
tor->id = h->id;
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tor->key = h->key;
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/* Guess scrape URL */
s1 = strchr( inf->trackerAnnounce, '/' );
while( ( s2 = strchr( s1 + 1, '/' ) ) )
{
s1 = s2;
}
s1++;
if( !strncmp( s1, "announce", 8 ) )
{
int pre = (long) s1 - (long) inf->trackerAnnounce;
int post = strlen( inf->trackerAnnounce ) - pre - 8;
memcpy( tor->scrape, inf->trackerAnnounce, pre );
sprintf( &tor->scrape[pre], "scrape" );
memcpy( &tor->scrape[pre+6], &inf->trackerAnnounce[pre+8], post );
}
/* Escaped info hash for HTTP queries */
for( i = 0; i < SHA_DIGEST_LENGTH; i++ )
{
sprintf( &tor->hashString[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;
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tor->completion = tr_cpInit( tor );
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tr_lockInit( &tor->lock );
tor->upload = h->upload;
tor->fdlimit = h->fdlimit;
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tor->prefsDirectory = (char *) h->prefsDirectory;
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/* We have a new torrent */
h->torrents[h->torrentCount] = tor;
(h->torrentCount)++;
return 0;
}
/***********************************************************************
* tr_torrentScrape
***********************************************************************
* Allocates a tr_torrent_t structure, then relies on tr_metainfoParse
* to fill it.
**********************************************************************/
int tr_torrentScrape( tr_handle_t * h, int t, int * s, int * l )
{
return tr_trackerScrape( h->torrents[t], s, l );
}
void tr_torrentSetFolder( tr_handle_t * h, int t, const char * path )
{
tr_torrent_t * tor = h->torrents[t];
tor->destination = strdup( path );
}
char * tr_torrentGetFolder( tr_handle_t * h, int t )
{
tr_torrent_t * tor = h->torrents[t];
return tor->destination;
}
void tr_torrentStart( tr_handle_t * h, int t )
{
tr_torrent_t * tor = h->torrents[t];
uint64_t now;
int i;
tor->status = TR_STATUS_CHECK;
tor->tracker = tr_trackerInit( h, tor );
tor->bindPort = h->bindPort;
#ifndef BEOS_NETSERVER
/* BeOS net_server seems to be unable to set incoming connections to
non-blocking. Too bad. */
if( !tr_fdSocketWillCreate( h->fdlimit, 0 ) )
{
tor->bindSocket = tr_netBind( &tor->bindPort );
}
#endif
now = tr_date();
for( i = 0; i < 10; i++ )
{
tor->dates[i] = now;
}
tor->die = 0;
tr_threadCreate( &tor->thread, downloadLoop, tor );
}
void tr_torrentStop( tr_handle_t * h, int t )
{
tr_torrent_t * tor = h->torrents[t];
tr_lockLock( tor->lock );
tr_trackerStopped( tor->tracker );
tor->status = TR_STATUS_STOPPING;
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tor->stopDate = tr_date();
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tr_lockUnlock( tor->lock );
}
/***********************************************************************
* torrentReallyStop
***********************************************************************
* Joins the download thread and frees/closes everything related to it.
**********************************************************************/
static void torrentReallyStop( tr_handle_t * h, int t )
{
tr_torrent_t * tor = h->torrents[t];
tor->die = 1;
tr_threadJoin( tor->thread );
tr_dbg( "Thread joined" );
tr_trackerClose( tor->tracker );
while( tor->peerCount > 0 )
{
tr_peerRem( tor, 0 );
}
if( tor->bindSocket > -1 )
{
tr_netClose( tor->bindSocket );
tr_fdSocketClosed( h->fdlimit, 0 );
}
memset( tor->downloaded, 0, sizeof( tor->downloaded ) );
memset( tor->uploaded, 0, sizeof( tor->uploaded ) );
}
/***********************************************************************
* tr_torrentCount
***********************************************************************
*
**********************************************************************/
int tr_torrentCount( tr_handle_t * h )
{
return h->torrentCount;
}
int tr_torrentStat( tr_handle_t * h, tr_stat_t ** stat )
{
tr_stat_t * s;
tr_torrent_t * tor;
tr_info_t * inf;
int i, j, k, piece;
if( h->torrentCount < 1 )
{
*stat = NULL;
return 0;
}
s = malloc( h->torrentCount * sizeof( tr_stat_t ) );
for( i = 0; i < h->torrentCount; i++ )
{
tor = h->torrents[i];
inf = &tor->info;
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if( ( tor->status & TR_STATUS_STOPPED ) ||
( ( tor->status & TR_STATUS_STOPPING ) &&
tr_date() > tor->stopDate + 60000 ) )
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{
torrentReallyStop( h, i );
tor->status = TR_STATUS_PAUSE;
}
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tr_lockLock( tor->lock );
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memcpy( &s[i].info, &tor->info, sizeof( tr_info_t ) );
s[i].status = tor->status;
memcpy( s[i].error, tor->error, sizeof( s[i].error ) );
s[i].peersTotal = 0;
s[i].peersUploading = 0;
s[i].peersDownloading = 0;
for( j = 0; j < tor->peerCount; j++ )
{
if( tr_peerIsConnected( tor->peers[j] ) )
{
(s[i].peersTotal)++;
if( tr_peerIsUploading( tor->peers[j] ) )
{
(s[i].peersUploading)++;
}
if( tr_peerIsDownloading( tor->peers[j] ) )
{
(s[i].peersDownloading)++;
}
}
}
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s[i].progress = tr_cpCompletionAsFloat( tor->completion );
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s[i].rateDownload = rateDownload( tor );
s[i].rateUpload = rateUpload( tor );
if( s[i].rateDownload < 0.1 )
{
s[i].eta = -1;
}
else
{
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s[i].eta = (float) ( 1.0 - s[i].progress ) *
(float) inf->totalSize / s[i].rateDownload / 1024.0;
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if( s[i].eta > 99 * 3600 + 59 * 60 + 59 )
{
s[i].eta = -1;
}
}
for( j = 0; j < 120; j++ )
{
piece = j * inf->pieceCount / 120;
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if( tr_cpPieceIsComplete( tor->completion, piece ) )
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{
s[i].pieces[j] = -1;
continue;
}
s[i].pieces[j] = 0;
for( k = 0; k < tor->peerCount; k++ )
{
if( tr_peerBitfield( tor->peers[k] ) &&
tr_bitfieldHas( tr_peerBitfield( tor->peers[k] ), piece ) )
{
(s[i].pieces[j])++;
}
}
}
s[i].downloaded = tor->downloaded[9];
s[i].uploaded = tor->uploaded[9];
s[i].folder = tor->destination;
tr_lockUnlock( tor->lock );
}
*stat = s;
return h->torrentCount;
}
/***********************************************************************
* tr_torrentClose
***********************************************************************
* Frees memory allocated by tr_torrentInit.
**********************************************************************/
void tr_torrentClose( tr_handle_t * h, int t )
{
tr_torrent_t * tor = h->torrents[t];
tr_info_t * inf = &tor->info;
if( tor->status & ( TR_STATUS_STOPPING | TR_STATUS_STOPPED ) )
{
/* Join the thread first */
torrentReallyStop( h, t );
}
h->torrentCount--;
tr_lockClose( tor->lock );
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tr_cpClose( tor->completion );
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if( tor->destination )
{
free( tor->destination );
}
free( inf->pieces );
free( inf->files );
free( tor );
memmove( &h->torrents[t], &h->torrents[t+1],
( h->torrentCount - t ) * sizeof( void * ) );
}
void tr_close( tr_handle_t * h )
{
tr_fdClose( h->fdlimit );
tr_uploadClose( h->upload );
free( h );
}
/***********************************************************************
* downloadLoop
**********************************************************************/
static void downloadLoop( void * _tor )
{
tr_torrent_t * tor = _tor;
uint64_t date1, date2;
tr_dbg( "Thread started" );
#ifdef SYS_BEOS
/* This is required because on BeOS, SIGINT is sent to each thread,
which kills them not nicely */
signal( SIGINT, SIG_IGN );
#endif
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tr_lockLock( tor->lock );
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tor->io = tr_ioInit( tor );
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tor->status = tr_cpIsSeeding( tor->completion ) ?
TR_STATUS_SEED : TR_STATUS_DOWNLOAD;
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while( !tor->die )
{
date1 = tr_date();
/* Are we finished ? */
if( ( tor->status & TR_STATUS_DOWNLOAD ) &&
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tr_cpIsSeeding( tor->completion ) )
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{
/* Done */
tor->status = TR_STATUS_SEED;
tr_trackerCompleted( tor->tracker );
}
/* Receive/send messages */
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tr_peerPulse( tor );
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/* Try to get new peers or to send a message to the tracker */
tr_trackerPulse( tor->tracker );
if( tor->status & TR_STATUS_STOPPED )
{
break;
}
/* Wait up to 20 ms */
date2 = tr_date();
if( date2 < date1 + 20 )
{
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tr_lockUnlock( tor->lock );
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tr_wait( date1 + 20 - date2 );
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tr_lockLock( tor->lock );
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}
}
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tr_lockUnlock( tor->lock );
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tr_ioClose( tor->io );
tor->status = TR_STATUS_STOPPED;
tr_dbg( "Thread exited" );
}
/***********************************************************************
* rateDownload, rateUpload
**********************************************************************/
static float rateGeneric( uint64_t * dates, uint64_t * counts )
{
float ret;
int i;
ret = 0.0;
for( i = 0; i < 9; i++ )
{
if( dates[i+1] == dates[i] )
{
continue;
}
ret += (float) ( i + 1 ) * 1000.0 / 1024.0 *
(float) ( counts[i+1] - counts[i] ) /
(float) ( dates[i+1] - dates[i] );
}
ret *= 1000.0 / 1024.0 / 45.0;
return ret;
}
static float rateDownload( tr_torrent_t * tor )
{
return rateGeneric( tor->dates, tor->downloaded );
}
static float rateUpload( tr_torrent_t * tor )
{
return rateGeneric( tor->dates, tor->uploaded );
}