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transmission/libtransmission/announcer.c

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/*
* This file Copyright (C) Mnemosyne LLC
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <assert.h>
#include <limits.h> /* INT_MAX */
#include <stdio.h>
#include <stdlib.h> /* qsort() */
#include <string.h> /* strcmp(), memcpy() */
#include <event2/buffer.h>
#include <event2/event.h> /* evtimer */
#define __LIBTRANSMISSION_ANNOUNCER_MODULE___
#include "transmission.h"
#include "announcer.h"
#include "announcer-common.h"
#include "crypto.h" /* tr_cryptoRandInt(), tr_cryptoWeakRandInt() */
#include "peer-mgr.h" /* tr_peerMgrCompactToPex() */
#include "ptrarray.h"
#include "session.h"
#include "torrent.h"
#include "utils.h"
struct tr_tier;
static void tier_build_log_name( const struct tr_tier * tier,
char * buf, size_t buflen );
#define dbgmsg( tier, ... ) \
if( tr_deepLoggingIsActive( ) ) do { \
char name[128]; \
tier_build_log_name( tier, name, sizeof( name ) ); \
tr_deepLog( __FILE__, __LINE__, name, __VA_ARGS__ ); \
} while( 0 )
enum
{
/* unless the tracker says otherwise, rescrape this frequently */
DEFAULT_SCRAPE_INTERVAL_SEC = ( 60 * 30 ),
/* unless the tracker says otherwise, this is the announce interval */
DEFAULT_ANNOUNCE_INTERVAL_SEC = ( 60 * 10 ),
/* unless the tracker says otherwise, this is the announce min_interval */
DEFAULT_ANNOUNCE_MIN_INTERVAL_SEC = ( 60 * 2 ),
/* how many web tasks we allow at one time */
MAX_CONCURRENT_TASKS = 48,
/* the value of the 'numwant' argument passed in tracker requests. */
NUMWANT = 80,
UPKEEP_INTERVAL_SECS = 1,
/* this is how often to call the UDP tracker upkeep */
TAU_UPKEEP_INTERVAL_SECS = 5
};
/***
****
***/
const char*
tr_announce_event_get_string( tr_announce_event e )
{
switch( e )
{
case TR_ANNOUNCE_EVENT_COMPLETED: return "completed";
case TR_ANNOUNCE_EVENT_STARTED: return "started";
case TR_ANNOUNCE_EVENT_STOPPED: return "stopped";
default: return "";
}
}
/***
****
***/
static int
compareTransfer( uint64_t a_uploaded, uint64_t a_downloaded,
uint64_t b_uploaded, uint64_t b_downloaded )
{
/* higher upload count goes first */
if( a_uploaded != b_uploaded )
return a_uploaded > b_uploaded ? -1 : 1;
/* then higher download count goes first */
if( a_downloaded != b_downloaded )
return a_downloaded > b_downloaded ? -1 : 1;
return 0;
}
/**
* Comparison function for tr_announce_requests.
*
* The primary key (amount of data transferred) is used to prioritize
* tracker announcements of active torrents. The remaining keys are
* used to satisfy the uniqueness requirement of a sorted tr_ptrArray.
*/
static int
compareStops( const void * va, const void * vb )
{
int i;
const tr_announce_request * a = va;
const tr_announce_request * b = vb;
/* primary key: volume of data transferred. */
if(( i = compareTransfer( a->up, a->down, b->up, b->down)))
return i;
/* secondary key: the torrent's info_hash */
if(( i = memcmp( a->info_hash, b->info_hash, SHA_DIGEST_LENGTH )))
return i;
/* tertiary key: the tracker's announec url */
return tr_strcmp0( a->url, b->url );
}
/***
****
***/
/**
* "global" (per-tr_session) fields
*/
typedef struct tr_announcer
{
tr_ptrArray stops; /* tr_announce_request */
tr_session * session;
struct event * upkeepTimer;
int slotsAvailable;
int key;
time_t tauUpkeepAt;
}
tr_announcer;
bool
tr_announcerHasBacklog( const struct tr_announcer * announcer )
{
return announcer->slotsAvailable < 1;
}
static void
onUpkeepTimer( int foo UNUSED, short bar UNUSED, void * vannouncer );
void
tr_announcerInit( tr_session * session )
{
tr_announcer * a;
assert( tr_isSession( session ) );
a = tr_new0( tr_announcer, 1 );
a->stops = TR_PTR_ARRAY_INIT;
a->key = tr_cryptoRandInt( INT_MAX );
a->session = session;
a->slotsAvailable = MAX_CONCURRENT_TASKS;
a->upkeepTimer = evtimer_new( session->event_base, onUpkeepTimer, a );
tr_timerAdd( a->upkeepTimer, UPKEEP_INTERVAL_SECS, 0 );
session->announcer = a;
}
static void flushCloseMessages( tr_announcer * announcer );
void
tr_announcerClose( tr_session * session )
{
tr_announcer * announcer = session->announcer;
flushCloseMessages( announcer );
tr_tracker_udp_start_shutdown( session );
event_free( announcer->upkeepTimer );
announcer->upkeepTimer = NULL;
tr_ptrArrayDestruct( &announcer->stops, NULL );
session->announcer = NULL;
tr_free( announcer );
}
/***
****
***/
/* a row in tr_tier's list of trackers */
typedef struct
{
char * key;
char * announce;
char * scrape;
char * tracker_id_str;
int seederCount;
int leecherCount;
int downloadCount;
int downloaderCount;
int consecutiveFailures;
uint32_t id;
}
tr_tracker;
/* format: host+':'+ port */
static char *
getKey( const char * url )
{
char * ret;
char * scheme = NULL;
char * host = NULL;
int port = 0;
tr_urlParse( url, -1, &scheme, &host, &port, NULL );
ret = tr_strdup_printf( "%s://%s:%d", (scheme?scheme:"invalid"), (host?host:"invalid"), port );
tr_free( host );
tr_free( scheme );
return ret;
}
static void
trackerConstruct( tr_tracker * tracker, const tr_tracker_info * inf )
{
memset( tracker, 0, sizeof( tr_tracker ) );
tracker->key = getKey( inf->announce );
tracker->announce = tr_strdup( inf->announce );
tracker->scrape = tr_strdup( inf->scrape );
tracker->id = inf->id;
tracker->seederCount = -1;
tracker->leecherCount = -1;
tracker->downloadCount = -1;
}
static void
trackerDestruct( tr_tracker * tracker )
{
tr_free( tracker->tracker_id_str );
tr_free( tracker->scrape );
tr_free( tracker->announce );
tr_free( tracker->key );
}
/***
****
***/
struct tr_torrent_tiers;
/** @brief A group of trackers in a single tier, as per the multitracker spec */
typedef struct tr_tier
{
/* number of up/down/corrupt bytes since the last time we sent an
* "event=stopped" message that was acknowledged by the tracker */
uint64_t byteCounts[3];
tr_tracker * trackers;
int tracker_count;
tr_tracker * currentTracker;
int currentTrackerIndex;
tr_torrent * tor;
time_t scrapeAt;
time_t lastScrapeStartTime;
time_t lastScrapeTime;
bool lastScrapeSucceeded;
bool lastScrapeTimedOut;
time_t announceAt;
time_t manualAnnounceAllowedAt;
time_t lastAnnounceStartTime;
time_t lastAnnounceTime;
bool lastAnnounceSucceeded;
bool lastAnnounceTimedOut;
tr_announce_event * announce_events;
int announce_event_count;
int announce_event_alloc;
/* unique lookup key */
int key;
int scrapeIntervalSec;
int announceIntervalSec;
int announceMinIntervalSec;
int lastAnnouncePeerCount;
bool isRunning;
bool isAnnouncing;
bool isScraping;
bool wasCopied;
char lastAnnounceStr[128];
char lastScrapeStr[128];
}
tr_tier;
static time_t
get_next_scrape_time( const tr_session * session, const tr_tier * tier, int interval )
{
time_t ret;
const time_t now = tr_time( );
/* Maybe don't scrape paused torrents */
if( !tier->isRunning && !session->scrapePausedTorrents )
ret = 0;
/* Add the interval, and then increment to the nearest 10th second.
* The latter step is to increase the odds of several torrents coming
* due at the same time to improve multiscrape. */
else {
ret = now + interval;
while( ret % 10 )
++ret;
}
return ret;
}
static void
tierConstruct( tr_tier * tier, tr_torrent * tor )
{
static int nextKey = 1;
memset( tier, 0, sizeof( tr_tier ) );
tier->key = nextKey++;
tier->currentTrackerIndex = -1;
tier->scrapeIntervalSec = DEFAULT_SCRAPE_INTERVAL_SEC;
tier->announceIntervalSec = DEFAULT_ANNOUNCE_INTERVAL_SEC;
tier->announceMinIntervalSec = DEFAULT_ANNOUNCE_MIN_INTERVAL_SEC;
tier->scrapeAt = get_next_scrape_time( tor->session, tier, tr_cryptoWeakRandInt( 180 ) );
tier->tor = tor;
}
static void
tierDestruct( tr_tier * tier )
{
tr_free( tier->announce_events );
}
static void
tier_build_log_name( const tr_tier * tier, char * buf, size_t buflen )
{
tr_snprintf( buf, buflen, "[%s---%s]",
( tier && tier->tor ) ? tr_torrentName( tier->tor ) : "?",
( tier && tier->currentTracker ) ? tier->currentTracker->key : "?" );
}
static void
tierIncrementTracker( tr_tier * tier )
{
/* move our index to the next tracker in the tier */
const int i = ( tier->currentTracker == NULL )
? 0
: ( tier->currentTrackerIndex + 1 ) % tier->tracker_count;
tier->currentTrackerIndex = i;
tier->currentTracker = &tier->trackers[i];
/* reset some of the tier's fields */
tier->scrapeIntervalSec = DEFAULT_SCRAPE_INTERVAL_SEC;
tier->announceIntervalSec = DEFAULT_ANNOUNCE_INTERVAL_SEC;
tier->announceMinIntervalSec = DEFAULT_ANNOUNCE_MIN_INTERVAL_SEC;
tier->isAnnouncing = false;
tier->isScraping = false;
tier->lastAnnounceStartTime = 0;
tier->lastScrapeStartTime = 0;
}
/***
****
***/
/**
* @brief Opaque, per-torrent data structure for tracker announce information
*
* this opaque data structure can be found in tr_torrent.tiers
*/
typedef struct tr_torrent_tiers
{
tr_tier * tiers;
int tier_count;
tr_tracker * trackers;
int tracker_count;
tr_tracker_callback * callback;
void * callbackData;
}
tr_torrent_tiers;
static tr_torrent_tiers*
tiersNew( void )
{
return tr_new0( tr_torrent_tiers, 1 );
}
static void
tiersDestruct( tr_torrent_tiers * tt )
{
int i;
for( i=0; i<tt->tracker_count; ++i )
trackerDestruct( &tt->trackers[i] );
tr_free( tt->trackers );
for( i=0; i<tt->tier_count; ++i )
tierDestruct( &tt->tiers[i] );
tr_free( tt->tiers );
}
static void
tiersFree( tr_torrent_tiers * tt )
{
tiersDestruct( tt );
tr_free( tt );
}
static tr_tier*
getTier( tr_announcer * announcer, const uint8_t * info_hash, int tierId )
{
tr_tier * tier = NULL;
if( announcer != NULL )
{
tr_session * session = announcer->session;
tr_torrent * tor = tr_torrentFindFromHash( session, info_hash );
if( tor && tor->tiers )
{
int i;
tr_torrent_tiers * tt = tor->tiers;
for( i=0; !tier && i<tt->tier_count; ++i )
if( tt->tiers[i].key == tierId )
tier = &tt->tiers[i];
}
}
return tier;
}
/***
**** PUBLISH
***/
static const tr_tracker_event TRACKER_EVENT_INIT = { 0, 0, 0, 0, 0, 0 };
static void
publishMessage( tr_tier * tier, const char * msg, int type )
{
if( tier && tier->tor && tier->tor->tiers && tier->tor->tiers->callback )
{
tr_torrent_tiers * tiers = tier->tor->tiers;
tr_tracker_event event = TRACKER_EVENT_INIT;
event.messageType = type;
event.text = msg;
if( tier->currentTracker )
event.tracker = tier->currentTracker->announce;
tiers->callback( tier->tor, &event, tiers->callbackData );
}
}
static void
publishErrorClear( tr_tier * tier )
{
publishMessage( tier, NULL, TR_TRACKER_ERROR_CLEAR );
}
static void
publishWarning( tr_tier * tier, const char * msg )
{
publishMessage( tier, msg, TR_TRACKER_WARNING );
}
static void
publishError( tr_tier * tier, const char * msg )
{
publishMessage( tier, msg, TR_TRACKER_ERROR );
}
static int8_t
getSeedProbability( tr_tier * tier, int seeds, int leechers, int pex_count )
{
/* special case optimization:
ocelot omits seeds from peer lists sent to seeds on private trackers.
so check for that case... */
if( ( leechers == pex_count ) && tr_torrentIsPrivate( tier->tor )
&& tr_torrentIsSeed( tier->tor )
&& ( seeds + leechers < NUMWANT ) )
return 0;
if( seeds>=0 && leechers>=0 && (seeds+leechers>0) )
return (int8_t)((100.0*seeds)/(seeds+leechers));
return -1; /* unknown */
}
static void
publishPeersPex( tr_tier * tier, int seeds, int leechers,
const tr_pex * pex, int n )
{
if( tier->tor->tiers->callback )
{
tr_tracker_event e = TRACKER_EVENT_INIT;
e.messageType = TR_TRACKER_PEERS;
e.seedProbability = getSeedProbability( tier, seeds, leechers, n );
e.pex = pex;
e.pexCount = n;
dbgmsg( tier, "got %d peers; seed prob %d", n, (int)e.seedProbability );
tier->tor->tiers->callback( tier->tor, &e, NULL );
}
}
/***
****
***/
struct ann_tracker_info
{
tr_tracker_info info;
char * scheme;
char * host;
char * path;
int port;
};
/* primary key: tier
* secondary key: udp comes before http */
static int
filter_trackers_compare_func( const void * va, const void * vb )
{
const struct ann_tracker_info * a = va;
const struct ann_tracker_info * b = vb;
if( a->info.tier != b->info.tier )
return a->info.tier - b->info.tier;
return -strcmp( a->scheme, b->scheme );
}
/**
* Massages the incoming list of trackers into something we can use.
*/
static tr_tracker_info *
filter_trackers( tr_tracker_info * input, int input_count, int * setme_count )
{
int i, in;
int j, jn;
int n = 0;
struct tr_tracker_info * ret;
struct ann_tracker_info * tmp = tr_new0( struct ann_tracker_info, input_count );
/*for( i=0, in=input_count; i<in; ++i ) fprintf( stderr, "IN: [%d][%s]\n", input[i].tier, input[i].announce );*/
/* build a list of valid trackers */
for( i=0, in=input_count; i<in; ++i ) {
if( tr_urlIsValidTracker( input[i].announce ) ) {
int port;
char * scheme;
char * host;
char * path;
bool is_duplicate = false;
tr_urlParse( input[i].announce, -1, &scheme, &host, &port, &path );
/* weed out one common source of duplicates:
* "http://tracker/announce" +
* "http://tracker:80/announce"
*/
for( j=0, jn=n; !is_duplicate && j<jn; ++j )
is_duplicate = (tmp[j].port==port)
&& !strcmp(tmp[j].scheme,scheme)
&& !strcmp(tmp[j].host,host)
&& !strcmp(tmp[j].path,path);
if( is_duplicate ) {
tr_free( path );
tr_free( host );
tr_free( scheme );
continue;
}
tmp[n].info = input[i];
tmp[n].scheme = scheme;
tmp[n].host = host;
tmp[n].port = port;
tmp[n].path = path;
n++;
}
}
/* if two announce URLs differ only by scheme, put them in the same tier.
* (note: this can leave gaps in the `tier' values, but since the calling
* function doesn't care, there's no point in removing the gaps...) */
for( i=0, in=n; i<in; ++i )
for( j=i+1, jn=n; j<jn; ++j )
if( (tmp[i].info.tier!=tmp[j].info.tier)
&& (tmp[i].port==tmp[j].port)
&& !tr_strcmp0(tmp[i].host,tmp[j].host)
&& !tr_strcmp0(tmp[i].path,tmp[j].path) )
tmp[j].info.tier = tmp[i].info.tier;
/* sort them, for two reasons:
* (1) unjumble the tiers from the previous step
* (2) move the UDP trackers to the front of each tier */
qsort( tmp, n, sizeof(struct ann_tracker_info), filter_trackers_compare_func );
/* build the output */
*setme_count = n;
ret = tr_new0( tr_tracker_info, n );
for( i=0, in=n; i<in; ++i )
ret[i] = tmp[i].info;
/* cleanup */
for( i=0, in=n; i<in; ++i ) {
tr_free( tmp[i].path );
tr_free( tmp[i].host );
tr_free( tmp[i].scheme );
}
tr_free( tmp );
/*for( i=0, in=n; i<in; ++i ) fprintf( stderr, "OUT: [%d][%s]\n", ret[i].tier, ret[i].announce );*/
return ret;
}
static void
addTorrentToTier( tr_torrent_tiers * tt, tr_torrent * tor )
{
int i, n;
int tier_count;
tr_tier * tier;
tr_tracker_info * infos = filter_trackers( tor->info.trackers,
tor->info.trackerCount, &n );
/* build the array of trackers */
tt->trackers = tr_new0( tr_tracker, n );
tt->tracker_count = n;
for( i=0; i<n; ++i )
trackerConstruct( &tt->trackers[i], &infos[i] );
/* count how many tiers there are */
tier_count = 0;
for( i=0; i<n; ++i )
if( !i || ( infos[i].tier != infos[i-1].tier ) )
++tier_count;
/* build the array of tiers */
tier = NULL;
tt->tiers = tr_new0( tr_tier, tier_count );
tt->tier_count = 0;
for( i=0; i<n; ++i ) {
if( i && ( infos[i].tier == infos[i-1].tier ) )
++tier->tracker_count;
else {
tier = &tt->tiers[tt->tier_count++];
tierConstruct( tier, tor );
tier->trackers = &tt->trackers[i];
tier->tracker_count = 1;
tierIncrementTracker( tier );
}
}
/* cleanup */
tr_free( infos );
}
tr_torrent_tiers *
tr_announcerAddTorrent( tr_torrent * tor,
tr_tracker_callback * callback,
void * callbackData )
{
tr_torrent_tiers * tiers;
assert( tr_isTorrent( tor ) );
tiers = tiersNew( );
tiers->callback = callback;
tiers->callbackData = callbackData;
addTorrentToTier( tiers, tor );
return tiers;
}
/***
****
***/
static bool
tierCanManualAnnounce( const tr_tier * tier )
{
return tier->manualAnnounceAllowedAt <= tr_time( );
}
bool
tr_announcerCanManualAnnounce( const tr_torrent * tor )
{
int i;
struct tr_torrent_tiers * tt = NULL;
assert( tr_isTorrent( tor ) );
assert( tor->tiers != NULL );
if( tor->isRunning )
tt = tor->tiers;
/* return true if any tier can manual announce */
for( i=0; tt && i<tt->tier_count; ++i )
if( tierCanManualAnnounce( &tt->tiers[i] ) )
return true;
return false;
}
time_t
tr_announcerNextManualAnnounce( const tr_torrent * tor )
{
int i;
time_t ret = ~(time_t)0;
struct tr_torrent_tiers * tt = tor->tiers;
/* find the earliest manual announce time from all peers */
for( i=0; tt && i<tt->tier_count; ++i )
if( tt->tiers[i].isRunning )
ret = MIN( ret, tt->tiers[i].manualAnnounceAllowedAt );
return ret;
}
static void
dbgmsg_tier_announce_queue( const tr_tier * tier )
{
if( tr_deepLoggingIsActive( ) )
{
int i;
char name[128];
struct evbuffer * buf = evbuffer_new( );
tier_build_log_name( tier, name, sizeof( name ) );
for( i=0; i<tier->announce_event_count; ++i )
{
const tr_announce_event e = tier->announce_events[i];
const char * str = tr_announce_event_get_string( e );
evbuffer_add_printf( buf, "[%d:%s]", i, str );
}
tr_deepLog( __FILE__, __LINE__, name, "announce queue is %s", evbuffer_pullup( buf, -1 ) );
evbuffer_free( buf );
}
}
static void
tier_announce_remove_trailing( tr_tier * tier, tr_announce_event e )
{
while( ( tier->announce_event_count > 0 )
&& ( tier->announce_events[tier->announce_event_count-1] == e ) )
--tier->announce_event_count;
}
static void
tier_announce_event_push( tr_tier * tier,
tr_announce_event e,
time_t announceAt )
{
int i;
assert( tier != NULL );
dbgmsg_tier_announce_queue( tier );
dbgmsg( tier, "queued \"%s\"", tr_announce_event_get_string( e ) );
if( tier->announce_event_count > 0 )
{
/* special case #1: if we're adding a "stopped" event,
* dump everything leading up to it except "completed" */
if( e == TR_ANNOUNCE_EVENT_STOPPED ) {
bool has_completed = false;
const tr_announce_event c = TR_ANNOUNCE_EVENT_COMPLETED;
for( i=0; !has_completed && i<tier->announce_event_count; ++i )
has_completed = c == tier->announce_events[i];
tier->announce_event_count = 0;
if( has_completed )
tier->announce_events[tier->announce_event_count++] = c;
}
/* special case #2: dump all empty strings leading up to this event */
tier_announce_remove_trailing( tier, TR_ANNOUNCE_EVENT_NONE );
/* special case #3: no consecutive duplicates */
tier_announce_remove_trailing( tier, e );
}
/* make room in the array for another event */
if( tier->announce_event_alloc <= tier->announce_event_count ) {
tier->announce_event_alloc += 4;
tier->announce_events = tr_renew( tr_announce_event,
tier->announce_events,
tier->announce_event_alloc );
}
/* add it */
tier->announce_events[tier->announce_event_count++] = e;
tier->announceAt = announceAt;
dbgmsg_tier_announce_queue( tier );
dbgmsg( tier, "announcing in %d seconds", (int)difftime(announceAt,tr_time()) );
}
static tr_announce_event
tier_announce_event_pull( tr_tier * tier )
{
const tr_announce_event e = tier->announce_events[0];
tr_removeElementFromArray( tier->announce_events,
0, sizeof( tr_announce_event ),
tier->announce_event_count-- );
return e;
}
static void
torrentAddAnnounce( tr_torrent * tor, tr_announce_event e, time_t announceAt )
{
int i;
struct tr_torrent_tiers * tt = tor->tiers;
/* walk through each tier and tell them to announce */
for( i=0; i<tt->tier_count; ++i )
tier_announce_event_push( &tt->tiers[i], e, announceAt );
}
void
tr_announcerTorrentStarted( tr_torrent * tor )
{
torrentAddAnnounce( tor, TR_ANNOUNCE_EVENT_STARTED, tr_time( ) );
}
void
tr_announcerManualAnnounce( tr_torrent * tor )
{
torrentAddAnnounce( tor, TR_ANNOUNCE_EVENT_NONE, tr_time( ) );
}
void
tr_announcerTorrentStopped( tr_torrent * tor )
{
torrentAddAnnounce( tor, TR_ANNOUNCE_EVENT_STOPPED, tr_time( ) );
}
void
tr_announcerTorrentCompleted( tr_torrent * tor )
{
torrentAddAnnounce( tor, TR_ANNOUNCE_EVENT_COMPLETED, tr_time( ) );
}
void
tr_announcerChangeMyPort( tr_torrent * tor )
{
tr_announcerTorrentStarted( tor );
}
/***
****
***/
void
tr_announcerAddBytes( tr_torrent * tor, int type, uint32_t byteCount )
{
int i;
struct tr_torrent_tiers * tt = tor->tiers;
assert( tr_isTorrent( tor ) );
assert( type==TR_ANN_UP || type==TR_ANN_DOWN || type==TR_ANN_CORRUPT );
for( i=0; i<tt->tier_count; ++i )
tt->tiers[i].byteCounts[ type ] += byteCount;
}
/***
****
***/
static tr_announce_request *
announce_request_new( const tr_announcer * announcer,
const tr_torrent * tor,
const tr_tier * tier,
tr_announce_event event )
{
tr_announce_request * req = tr_new0( tr_announce_request, 1 );
req->port = tr_sessionGetPublicPeerPort( announcer->session );
req->url = tr_strdup( tier->currentTracker->announce );
req->tracker_id_str = tr_strdup( tier->currentTracker->tracker_id_str );
memcpy( req->info_hash, tor->info.hash, SHA_DIGEST_LENGTH );
memcpy( req->peer_id, tor->peer_id, PEER_ID_LEN );
req->up = tier->byteCounts[TR_ANN_UP];
req->down = tier->byteCounts[TR_ANN_DOWN];
req->corrupt = tier->byteCounts[TR_ANN_CORRUPT];
req->left = tr_cpLeftUntilComplete( &tor->completion ),
req->event = event;
req->numwant = event == TR_ANNOUNCE_EVENT_STOPPED ? 0 : NUMWANT;
req->key = announcer->key;
req->partial_seed = tr_cpGetStatus( &tor->completion ) == TR_PARTIAL_SEED;
tier_build_log_name( tier, req->log_name, sizeof( req->log_name ) );
return req;
}
static void announce_request_free( tr_announce_request * req );
void
tr_announcerRemoveTorrent( tr_announcer * announcer, tr_torrent * tor )
{
struct tr_torrent_tiers * tt = tor->tiers;
if( tt != NULL )
{
int i;
for( i=0; i<tt->tier_count; ++i )
{
tr_tier * tier = &tt->tiers[i];
if( tier->isRunning )
{
const tr_announce_event e = TR_ANNOUNCE_EVENT_STOPPED;
tr_announce_request * req = announce_request_new( announcer, tor, tier, e );
if( tr_ptrArrayFindSorted( &announcer->stops, req, compareStops ) != NULL )
announce_request_free( req );
else
tr_ptrArrayInsertSorted( &announcer->stops, req, compareStops );
}
}
tiersFree( tor->tiers );
tor->tiers = NULL;
}
}
static int
getRetryInterval( const tr_tracker * t )
{
int minutes;
const unsigned int jitter_seconds = tr_cryptoWeakRandInt( 60 );
switch( t->consecutiveFailures ) {
case 0: minutes = 1; break;
case 1: minutes = 5; break;
case 2: minutes = 15; break;
case 3: minutes = 30; break;
case 4: minutes = 60; break;
default: minutes = 120; break;
}
return ( minutes * 60 ) + jitter_seconds;
}
struct announce_data
{
int tierId;
time_t timeSent;
tr_announce_event event;
tr_session * session;
/** If the request succeeds, the value for tier's "isRunning" flag */
bool isRunningOnSuccess;
};
static void
on_announce_error( tr_tier * tier, const char * err, tr_announce_event e )
{
int interval;
/* increment the error count */
if( tier->currentTracker != NULL )
++tier->currentTracker->consecutiveFailures;
/* set the error message */
dbgmsg( tier, "%s", err );
tr_torinf( tier->tor, "%s", err );
tr_strlcpy( tier->lastAnnounceStr, err, sizeof( tier->lastAnnounceStr ) );
/* switch to the next tracker */
tierIncrementTracker( tier );
/* schedule a reannounce */
interval = getRetryInterval( tier->currentTracker );
dbgmsg( tier, "Retrying announce in %d seconds.", interval );
tr_torinf( tier->tor, "Retrying announce in %d seconds.", interval );
tier_announce_event_push( tier, e, tr_time( ) + interval );
}
static void
on_announce_done( const tr_announce_response * response,
void * vdata )
{
struct announce_data * data = vdata;
tr_announcer * announcer = data->session->announcer;
tr_tier * tier = getTier( announcer, response->info_hash, data->tierId );
const time_t now = tr_time( );
const tr_announce_event event = data->event;
if( announcer )
++announcer->slotsAvailable;
if( tier != NULL )
{
tr_tracker * tracker;
dbgmsg( tier, "Got announce response: "
"connected:%d "
"timeout:%d "
"seeders:%d "
"leechers:%d "
"downloads:%d "
"interval:%d "
"min_interval:%d "
"tracker_id_str:%s "
"pex:%zu "
"pex6:%zu "
"err:%s "
"warn:%s",
(int)response->did_connect,
(int)response->did_timeout,
response->seeders,
response->leechers,
response->downloads,
response->interval,
response->min_interval,
response->tracker_id_str ? response->tracker_id_str : "none",
response->pex_count,
response->pex6_count,
response->errmsg ? response->errmsg : "none",
response->warning ? response->warning : "none" );
tier->lastAnnounceTime = now;
tier->lastAnnounceTimedOut = response->did_timeout;
tier->lastAnnounceSucceeded = false;
tier->isAnnouncing = false;
tier->manualAnnounceAllowedAt = now + tier->announceMinIntervalSec;
if( !response->did_connect )
{
on_announce_error( tier, _( "Could not connect to tracker" ), event );
}
else if( response->did_timeout )
{
on_announce_error( tier, _( "Tracker did not respond" ), event );
}
else if( response->errmsg )
{
/* If the torrent's only tracker returned an error, publish it.
Don't bother publishing if there are other trackers -- it's
all too common for people to load up dozens of dead trackers
in a torrent's metainfo... */
if( tier->tor->info.trackerCount < 2 )
publishError( tier, response->errmsg );
on_announce_error( tier, response->errmsg, event );
}
else
{
int i;
const char * str;
bool got_scrape_info = false;
const bool isStopped = event == TR_ANNOUNCE_EVENT_STOPPED;
publishErrorClear( tier );
if(( tracker = tier->currentTracker ))
{
tracker->consecutiveFailures = 0;
/* if the tracker included scrape fields in its announce response,
then a separate scrape isn't needed */
got_scrape_info = response->seeders
|| response->leechers
|| response->downloads;
if( got_scrape_info )
{
tracker->seederCount = response->seeders;
tracker->leecherCount = response->leechers;
tracker->downloadCount = response->downloads;
}
if(( str = response->tracker_id_str ))
{
tr_free( tracker->tracker_id_str );
tracker->tracker_id_str = tr_strdup( str );
}
}
if(( str = response->warning ))
{
tr_strlcpy( tier->lastAnnounceStr, str,
sizeof( tier->lastAnnounceStr ) );
dbgmsg( tier, "tracker gave \"%s\"", str );
publishWarning( tier, str );
}
if(( i = response->min_interval ))
tier->announceMinIntervalSec = i;
if(( i = response->interval ))
tier->announceIntervalSec = i;
if( response->pex_count > 0 )
publishPeersPex( tier, response->seeders, response->leechers,
response->pex, response->pex_count );
if( response->pex6_count > 0 )
publishPeersPex( tier, response->seeders, response->leechers,
response->pex6, response->pex6_count );
if( !*tier->lastAnnounceStr )
tr_strlcpy( tier->lastAnnounceStr, _( "Success" ),
sizeof( tier->lastAnnounceStr ) );
tier->isRunning = data->isRunningOnSuccess;
if( got_scrape_info )
{
tr_tordbg( tier->tor, "Announce response contained scrape info; "
"rescheduling next scrape to %d seconds from now.",
tier->scrapeIntervalSec );
tier->scrapeAt = get_next_scrape_time( announcer->session, tier, tier->scrapeIntervalSec );
tier->lastScrapeTime = now;
tier->lastScrapeSucceeded = true;
}
else if( tier->lastScrapeTime + tier->scrapeIntervalSec <= now )
{
tier->scrapeAt = get_next_scrape_time( announcer->session, tier, 0 );
}
tier->lastAnnounceSucceeded = true;
tier->lastAnnouncePeerCount = response->pex_count
+ response->pex6_count;
if( isStopped )
{
/* now that we've successfully stopped the torrent,
* we can reset the up/down/corrupt count we've kept
* for this tracker */
tier->byteCounts[ TR_ANN_UP ] = 0;
tier->byteCounts[ TR_ANN_DOWN ] = 0;
tier->byteCounts[ TR_ANN_CORRUPT ] = 0;
}
if( !isStopped && !tier->announce_event_count )
{
/* the queue is empty, so enqueue a perodic update */
i = tier->announceIntervalSec;
dbgmsg( tier, "Sending periodic reannounce in %d seconds", i );
tier_announce_event_push( tier, TR_ANNOUNCE_EVENT_NONE, now + i );
}
}
}
tr_free( data );
}
static void
announce_request_free( tr_announce_request * req )
{
tr_free( req->tracker_id_str );
tr_free( req->url );
tr_free( req );
}
static void
announce_request_delegate( tr_announcer * announcer,
tr_announce_request * request,
tr_announce_response_func * callback,
void * callback_data )
{
tr_session * session = announcer->session;
if( !memcmp( request->url, "http", 4 ) )
tr_tracker_http_announce( session, request, callback, callback_data );
else if( !memcmp( request->url, "udp://", 6 ) )
tr_tracker_udp_announce( session, request, callback, callback_data );
else
tr_err( "Unsupported url: %s", request->url );
announce_request_free( request );
}
static void
tierAnnounce( tr_announcer * announcer, tr_tier * tier )
{
tr_announce_event announce_event;
tr_announce_request * req;
struct announce_data * data;
const tr_torrent * tor = tier->tor;
const time_t now = tr_time( );
assert( !tier->isAnnouncing );
assert( tier->announce_event_count > 0 );
announce_event = tier_announce_event_pull( tier );
req = announce_request_new( announcer, tor, tier, announce_event );
data = tr_new0( struct announce_data, 1 );
data->session = announcer->session;
data->tierId = tier->key;
data->isRunningOnSuccess = tor->isRunning;
data->timeSent = now;
data->event = announce_event;
tier->isAnnouncing = true;
tier->lastAnnounceStartTime = now;
--announcer->slotsAvailable;
announce_request_delegate( announcer, req, on_announce_done, data );
}
/***
****
**** SCRAPE
****
***/
static void
on_scrape_error( tr_session * session, tr_tier * tier, const char * errmsg )
{
int interval;
/* increment the error count */
if( tier->currentTracker != NULL )
++tier->currentTracker->consecutiveFailures;
/* set the error message */
dbgmsg( tier, "Scrape error: %s", errmsg );
tr_torinf( tier->tor, "Scrape error: %s", errmsg );
tr_strlcpy( tier->lastScrapeStr, errmsg, sizeof( tier->lastScrapeStr ) );
/* switch to the next tracker */
tierIncrementTracker( tier );
/* schedule a rescrape */
interval = getRetryInterval( tier->currentTracker );
dbgmsg( tier, "Retrying scrape in %zu seconds.", (size_t)interval );
tr_torinf( tier->tor, "Retrying scrape in %zu seconds.", (size_t)interval );
tier->lastScrapeSucceeded = false;
tier->scrapeAt = get_next_scrape_time( session, tier, interval );
}
static tr_tier *
find_tier( tr_torrent * tor, const char * scrape )
{
int i;
struct tr_torrent_tiers * tt = tor->tiers;
for( i=0; tt && i<tt->tier_count; ++i ) {
const tr_tracker * const tracker = tt->tiers[i].currentTracker;
if( tracker && !tr_strcmp0( scrape, tracker->scrape ) )
return &tt->tiers[i];
}
return NULL;
}
static void
on_scrape_done( const tr_scrape_response * response, void * vsession )
{
int i;
const time_t now = tr_time( );
tr_session * session = vsession;
tr_announcer * announcer = session->announcer;
for( i=0; i<response->row_count; ++i )
{
const struct tr_scrape_response_row * row = &response->rows[i];
tr_torrent * tor = tr_torrentFindFromHash( session, row->info_hash );
if( tor != NULL )
{
tr_tier * tier = find_tier( tor, response->url );
if( tier != NULL )
{
dbgmsg( tier, "scraped url:%s -- "
"did_connect:%d "
"did_timeout:%d "
"seeders:%d "
"leechers:%d "
"downloads:%d "
"downloaders:%d "
"min_request_interval:%d "
"err:%s ",
response->url,
(int)response->did_connect,
(int)response->did_timeout,
row->seeders,
row->leechers,
row->downloads,
row->downloaders,
response->min_request_interval,
response->errmsg ? response->errmsg : "none" );
tier->isScraping = false;
tier->lastScrapeTime = now;
tier->lastScrapeSucceeded = false;
tier->lastScrapeTimedOut = response->did_timeout;
if( !response->did_connect )
{
on_scrape_error( session, tier, _( "Could not connect to tracker" ) );
}
else if( response->did_timeout )
{
on_scrape_error( session, tier, _( "Tracker did not respond" ) );
}
else if( response->errmsg )
{
on_scrape_error( session, tier, response->errmsg );
}
else
{
tr_tracker * tracker;
tier->lastScrapeSucceeded = true;
tier->scrapeIntervalSec = MAX( DEFAULT_SCRAPE_INTERVAL_SEC,
response->min_request_interval );
tier->scrapeAt = get_next_scrape_time( session, tier, tier->scrapeIntervalSec );
tr_tordbg( tier->tor, "Scrape successful. Rescraping in %d seconds.",
tier->scrapeIntervalSec );
if(( tracker = tier->currentTracker ))
{
tracker->seederCount = row->seeders;
tracker->leecherCount = row->leechers;
tracker->downloadCount = row->downloads;
tracker->downloaderCount = row->downloaders;
tracker->consecutiveFailures = 0;
}
}
}
}
}
if( announcer )
++announcer->slotsAvailable;
}
static void
scrape_request_delegate( tr_announcer * announcer,
const tr_scrape_request * request,
tr_scrape_response_func * callback,
void * callback_data )
{
tr_session * session = announcer->session;
if( !memcmp( request->url, "http", 4 ) )
tr_tracker_http_scrape( session, request, callback, callback_data );
else if( !memcmp( request->url, "udp://", 6 ) )
tr_tracker_udp_scrape( session, request, callback, callback_data );
else
tr_err( "Unsupported url: %s", request->url );
}
static void
multiscrape( tr_announcer * announcer, tr_ptrArray * tiers )
{
int i;
int request_count = 0;
const time_t now = tr_time( );
const int tier_count = tr_ptrArraySize( tiers );
const int max_request_count = MIN( announcer->slotsAvailable, tier_count );
tr_scrape_request * requests = tr_new0( tr_scrape_request, max_request_count );
/* batch as many info_hashes into a request as we can */
for( i=0; i<tier_count; ++i )
{
int j;
tr_tier * tier = tr_ptrArrayNth( tiers, i );
char * url = tier->currentTracker->scrape;
const uint8_t * hash = tier->tor->info.hash;
/* if there's a request with this scrape URL and a free slot, use it */
for( j=0; j<request_count; ++j )
{
tr_scrape_request * req = &requests[j];
if( req->info_hash_count >= TR_MULTISCRAPE_MAX )
continue;
if( tr_strcmp0( req->url, url ) )
continue;
memcpy( req->info_hash[req->info_hash_count++], hash, SHA_DIGEST_LENGTH );
tier->isScraping = true;
tier->lastScrapeStartTime = now;
break;
}
/* otherwise, if there's room for another request, build a new one */
if( ( j==request_count ) && ( request_count < max_request_count ) )
{
tr_scrape_request * req = &requests[request_count++];
req->url = url;
tier_build_log_name( tier, req->log_name, sizeof( req->log_name ) );
memcpy( req->info_hash[req->info_hash_count++], hash, SHA_DIGEST_LENGTH );
tier->isScraping = true;
tier->lastScrapeStartTime = now;
}
}
/* send the requests we just built */
for( i=0; i<request_count; ++i )
scrape_request_delegate( announcer, &requests[i], on_scrape_done, announcer->session );
/* cleanup */
tr_free( requests );
}
static void
flushCloseMessages( tr_announcer * announcer )
{
int i;
const int n = tr_ptrArraySize( &announcer->stops );
for( i=0; i<n; ++i )
announce_request_delegate( announcer, tr_ptrArrayNth( &announcer->stops, i ), NULL, NULL );
tr_ptrArrayClear( &announcer->stops );
}
static bool
tierNeedsToAnnounce( const tr_tier * tier, const time_t now )
{
return !tier->isAnnouncing
&& !tier->isScraping
&& ( tier->announceAt != 0 )
&& ( tier->announceAt <= now )
&& ( tier->announce_event_count > 0 );
}
static bool
tierNeedsToScrape( const tr_tier * tier, const time_t now )
{
return ( !tier->isScraping )
&& ( tier->scrapeAt != 0 )
&& ( tier->scrapeAt <= now )
&& ( tier->currentTracker != NULL )
&& ( tier->currentTracker->scrape != NULL );
}
static int
compareTiers( const void * va, const void * vb )
{
int ret;
const tr_tier * a = *(const tr_tier**)va;
const tr_tier * b = *(const tr_tier**)vb;
/* primary key: larger stats come before smaller */
ret = compareTransfer( a->byteCounts[TR_ANN_UP], a->byteCounts[TR_ANN_DOWN],
b->byteCounts[TR_ANN_UP], b->byteCounts[TR_ANN_DOWN] );
/* secondary key: announcements that have been waiting longer go first */
if( !ret && ( a->announceAt != b->announceAt ) )
ret = a->announceAt < b->announceAt ? -1 : 1;
return ret;
}
static void
announceMore( tr_announcer * announcer )
{
int i;
int n;
tr_torrent * tor;
tr_ptrArray announceMe = TR_PTR_ARRAY_INIT;
tr_ptrArray scrapeMe = TR_PTR_ARRAY_INIT;
const time_t now = tr_time( );
dbgmsg( NULL, "announceMore: slotsAvailable is %d", announcer->slotsAvailable );
if( announcer->slotsAvailable < 1 )
return;
/* build a list of tiers that need to be announced */
tor = NULL;
while(( tor = tr_torrentNext( announcer->session, tor ))) {
struct tr_torrent_tiers * tt = tor->tiers;
for( i=0; tt && i<tt->tier_count; ++i ) {
tr_tier * tier = &tt->tiers[i];
if( tierNeedsToAnnounce( tier, now ) )
tr_ptrArrayAppend( &announceMe, tier );
else if( tierNeedsToScrape( tier, now ) )
tr_ptrArrayAppend( &scrapeMe, tier );
}
}
/* if there are more tiers than slots available, prioritize */
n = tr_ptrArraySize( &announceMe );
if( n > announcer->slotsAvailable )
qsort( tr_ptrArrayBase(&announceMe), n, sizeof(tr_tier*), compareTiers );
/* announce some */
n = MIN( tr_ptrArraySize( &announceMe ), announcer->slotsAvailable );
for( i=0; i<n; ++i ) {
tr_tier * tier = tr_ptrArrayNth( &announceMe, i );
tr_tordbg( tier->tor, "%s", "Announcing to tracker" );
dbgmsg( tier, "announcing tier %d of %d", i, n );
tierAnnounce( announcer, tier );
}
/* scrape some */
multiscrape( announcer, &scrapeMe );
/* cleanup */
tr_ptrArrayDestruct( &scrapeMe, NULL );
tr_ptrArrayDestruct( &announceMe, NULL );
}
static void
onUpkeepTimer( int foo UNUSED, short bar UNUSED, void * vannouncer )
{
tr_announcer * announcer = vannouncer;
tr_session * session = announcer->session;
const bool is_closing = session->isClosed;
const time_t now = tr_time( );
tr_sessionLock( session );
/* maybe send out some "stopped" messages for closed torrents */
flushCloseMessages( announcer );
/* maybe send out some announcements to trackers */
if( !is_closing )
announceMore( announcer );
/* TAU upkeep */
if( announcer->tauUpkeepAt <= now ) {
announcer->tauUpkeepAt = now + TAU_UPKEEP_INTERVAL_SECS;
tr_tracker_udp_upkeep( session );
}
/* set up the next timer */
tr_timerAdd( announcer->upkeepTimer, UPKEEP_INTERVAL_SECS, 0 );
tr_sessionUnlock( session );
}
/***
****
***/
tr_tracker_stat *
tr_announcerStats( const tr_torrent * torrent, int * setmeTrackerCount )
{
int i;
int out = 0;
tr_tracker_stat * ret;
struct tr_torrent_tiers * tt;
const time_t now = tr_time( );
assert( tr_isTorrent( torrent ) );
assert( tr_torrentIsLocked( torrent ) );
tt = torrent->tiers;
/* alloc the stats */
*setmeTrackerCount = tt->tracker_count;
ret = tr_new0( tr_tracker_stat, tt->tracker_count );
/* populate the stats */
for( i=0; i<tt->tier_count; ++i )
{
int j;
const tr_tier * const tier = &tt->tiers[i];
for( j=0; j<tier->tracker_count; ++j )
{
const tr_tracker * const tracker = &tier->trackers[j];
tr_tracker_stat * st = &ret[out++];
st->id = tracker->id;
tr_strlcpy( st->host, tracker->key, sizeof( st->host ) );
tr_strlcpy( st->announce, tracker->announce, sizeof( st->announce ) );
st->tier = i;
st->isBackup = tracker != tier->currentTracker;
st->lastScrapeStartTime = tier->lastScrapeStartTime;
if( tracker->scrape )
tr_strlcpy( st->scrape, tracker->scrape, sizeof( st->scrape ) );
else
st->scrape[0] = '\0';
st->seederCount = tracker->seederCount;
st->leecherCount = tracker->leecherCount;
st->downloadCount = tracker->downloadCount;
if( st->isBackup )
{
st->scrapeState = TR_TRACKER_INACTIVE;
st->announceState = TR_TRACKER_INACTIVE;
st->nextScrapeTime = 0;
st->nextAnnounceTime = 0;
}
else
{
if(( st->hasScraped = tier->lastScrapeTime != 0 )) {
st->lastScrapeTime = tier->lastScrapeTime;
st->lastScrapeSucceeded = tier->lastScrapeSucceeded;
st->lastScrapeTimedOut = tier->lastScrapeTimedOut;
tr_strlcpy( st->lastScrapeResult, tier->lastScrapeStr,
sizeof( st->lastScrapeResult ) );
}
if( tier->isScraping )
st->scrapeState = TR_TRACKER_ACTIVE;
else if( !tier->scrapeAt )
st->scrapeState = TR_TRACKER_INACTIVE;
else if( tier->scrapeAt > now )
{
st->scrapeState = TR_TRACKER_WAITING;
st->nextScrapeTime = tier->scrapeAt;
}
else
st->scrapeState = TR_TRACKER_QUEUED;
st->lastAnnounceStartTime = tier->lastAnnounceStartTime;
if(( st->hasAnnounced = tier->lastAnnounceTime != 0 )) {
st->lastAnnounceTime = tier->lastAnnounceTime;
tr_strlcpy( st->lastAnnounceResult, tier->lastAnnounceStr,
sizeof( st->lastAnnounceResult ) );
st->lastAnnounceSucceeded = tier->lastAnnounceSucceeded;
st->lastAnnounceTimedOut = tier->lastAnnounceTimedOut;
st->lastAnnouncePeerCount = tier->lastAnnouncePeerCount;
}
if( tier->isAnnouncing )
st->announceState = TR_TRACKER_ACTIVE;
else if( !torrent->isRunning || !tier->announceAt )
st->announceState = TR_TRACKER_INACTIVE;
else if( tier->announceAt > now )
{
st->announceState = TR_TRACKER_WAITING;
st->nextAnnounceTime = tier->announceAt;
}
else
st->announceState = TR_TRACKER_QUEUED;
}
}
}
return ret;
}
void
tr_announcerStatsFree( tr_tracker_stat * trackers,
int trackerCount UNUSED )
{
tr_free( trackers );
}
/***
****
***/
static void
copy_tier_attributes_impl( struct tr_tier * tgt, int trackerIndex, const tr_tier * src )
{
const tr_tier keep = *tgt;
/* sanity clause */
assert( trackerIndex < tgt->tracker_count );
assert( !tr_strcmp0( tgt->trackers[trackerIndex].announce, src->currentTracker->announce ) );
/* bitwise copy will handle most of tr_tier's fields... */
*tgt = *src;
/* ...fix the fields that can't be cleanly bitwise-copied */
tgt->wasCopied = true;
tgt->trackers = keep.trackers;
tgt->tracker_count = keep.tracker_count;
tgt->announce_events = tr_memdup( src->announce_events, sizeof( tr_announce_event ) * src->announce_event_count );
tgt->announce_event_count = src->announce_event_count;
tgt->announce_event_alloc = src->announce_event_count;
tgt->currentTrackerIndex = trackerIndex;
tgt->currentTracker = &tgt->trackers[trackerIndex];
tgt->currentTracker->seederCount = src->currentTracker->seederCount;
tgt->currentTracker->leecherCount = src->currentTracker->leecherCount;
tgt->currentTracker->downloadCount = src->currentTracker->downloadCount;
tgt->currentTracker->downloaderCount = src->currentTracker->downloaderCount;
}
static void
copy_tier_attributes( struct tr_torrent_tiers * tt, const tr_tier * src )
{
int i, j;
bool found = false;
/* find a tier (if any) which has a match for src->currentTracker */
for( i=0; !found && i<tt->tier_count; ++i )
for( j=0; !found && j<tt->tiers[i].tracker_count; ++j )
if(( found = !tr_strcmp0( src->currentTracker->announce, tt->tiers[i].trackers[j].announce )))
copy_tier_attributes_impl( &tt->tiers[i], j, src );
}
void
tr_announcerResetTorrent( tr_announcer * announcer UNUSED, tr_torrent * tor )
{
int i;
const time_t now = tr_time( );
struct tr_torrent_tiers * tt = tor->tiers;
tr_torrent_tiers old = *tt;
assert( tt != NULL );
/* remove the old tiers / trackers */
tt->tiers = NULL;
tt->trackers = NULL;
tt->tier_count = 0;
tt->tracker_count = 0;
/* create the new tiers / trackers */
addTorrentToTier( tt, tor );
/* copy the old tiers' states into their replacements */
for( i=0; i<old.tier_count; ++i )
if( old.tiers[i].currentTracker != NULL )
copy_tier_attributes( tt, &old.tiers[i] );
/* kickstart any tiers that didn't get started */
if( tor->isRunning )
for( i=0; i<tt->tier_count; ++i )
if( !tt->tiers[i].wasCopied )
tier_announce_event_push( &tt->tiers[i], TR_ANNOUNCE_EVENT_STARTED, now );
/* cleanup */
tiersDestruct( &old );
}
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