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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"
#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;
}
static int
compareStops( const void * va, const void * vb )
{
const tr_announce_request * a = va;
const tr_announce_request * b = vb;
return compareTransfer( a->up, a->down, b->up, b->down);
}
/***
****
***/
/**
* "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 tr_tracker*
trackerNew( const char * announce, const char * scrape, uint32_t id )
{
tr_tracker * tracker = tr_new0( tr_tracker, 1 );
tracker->key = getKey( announce );
tracker->announce = tr_strdup( announce );
tracker->scrape = tr_strdup( scrape );
tracker->id = id;
tracker->seederCount = -1;
tracker->leecherCount = -1;
tracker->downloadCount = -1;
return tracker;
}
static void
trackerFree( void * vtracker )
{
tr_tracker * tracker = vtracker;
tr_free( tracker->tracker_id_str );
tr_free( tracker->scrape );
tr_free( tracker->announce );
tr_free( tracker->key );
tr_free( tracker );
}
/***
****
***/
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_ptrArray trackers; /* tr_tracker */
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 tr_tier *
tierNew( tr_torrent * tor )
{
tr_tier * t;
static int nextKey = 1;
const time_t now = tr_time( );
t = tr_new0( tr_tier, 1 );
t->key = nextKey++;
t->announce_events = NULL;
t->announce_event_count = 0;
t->announce_event_alloc = 0;
t->trackers = TR_PTR_ARRAY_INIT;
t->currentTracker = NULL;
t->currentTrackerIndex = -1;
t->scrapeIntervalSec = DEFAULT_SCRAPE_INTERVAL_SEC;
t->announceIntervalSec = DEFAULT_ANNOUNCE_INTERVAL_SEC;
t->announceMinIntervalSec = DEFAULT_ANNOUNCE_MIN_INTERVAL_SEC;
t->scrapeAt = now + tr_cryptoWeakRandInt( 60*3 );
t->tor = tor;
return t;
}
static void
tierFree( void * vtier )
{
tr_tier * tier = vtier;
tr_ptrArrayDestruct( &tier->trackers, trackerFree );
tr_free( tier->announce_events );
tr_free( tier );
}
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 ) % tr_ptrArraySize( &tier->trackers );
tier->currentTracker = tr_ptrArrayNth( &tier->trackers, i );
tier->currentTrackerIndex = 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;
}
static void
tierAddTracker( tr_tier * tier,
const char * announce,
const char * scrape,
uint32_t id )
{
tr_tracker * tracker = trackerNew( announce, scrape, id );
tr_ptrArrayAppend( &tier->trackers, tracker );
dbgmsg( tier, "adding tracker %s", announce );
if( !tier->currentTracker )
tierIncrementTracker( tier );
}
/***
****
***/
/**
* @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_ptrArray tiers; /* tr_tier */
tr_tracker_callback * callback;
void * callbackData;
}
tr_torrent_tiers;
static tr_torrent_tiers*
tiersNew( void )
{
tr_torrent_tiers * tiers = tr_new0( tr_torrent_tiers, 1 );
tiers->tiers = TR_PTR_ARRAY_INIT;
return tiers;
}
static void
tiersFree( tr_torrent_tiers * tiers )
{
tr_ptrArrayDestruct( &tiers->tiers, tierFree );
tr_free( tiers );
}
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_ptrArray * tiers = &tor->tiers->tiers;
const int n = tr_ptrArraySize( tiers );
for( i=0; !tier && i<n; ++i )
{
tr_tier * tmp = tr_ptrArrayNth( tiers, i );
if( tmp->key == tierId )
tier = tmp;
}
}
}
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 )
return 0;
if( seeds>=0 && 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<n; ++i )
for( j=0, jn=n; j<n; ++j )
if( (i!=j) && (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<n; ++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 * tiers, tr_torrent * tor )
{
int i, n;
tr_tracker_info * infos = filter_trackers( tor->info.trackers,
tor->info.trackerCount, &n );
/* build our internal table of tiers... */
if( n > 0 )
{
int tierIndex = -1;
tr_tier * tier = NULL;
for( i=0; i<n; ++i )
{
const tr_tracker_info * info = &infos[i];
if( info->tier != tierIndex )
tier = NULL;
tierIndex = info->tier;
if( tier == NULL ) {
tier = tierNew( tor );
dbgmsg( tier, "adding tier" );
tr_ptrArrayAppend( &tiers->tiers, tier );
}
tierAddTracker( tier, info->announce, info->scrape, info->id );
}
}
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;
int n;
const tr_tier ** tiers;
assert( tr_isTorrent( tor ) );
assert( tor->tiers != NULL );
if( !tor->isRunning )
return false;
/* return true if any tier can manual announce */
n = tr_ptrArraySize( &tor->tiers->tiers );
tiers = (const tr_tier**) tr_ptrArrayBase( &tor->tiers->tiers );
for( i=0; i<n; ++i )
if( tierCanManualAnnounce( tiers[i] ) )
return true;
return false;
}
time_t
tr_announcerNextManualAnnounce( const tr_torrent * tor )
{
int i;
int n;
const tr_torrent_tiers * tiers;
time_t ret = ~(time_t)0;
assert( tr_isTorrent( tor ) );
/* find the earliest manual announce time from all peers */
tiers = tor->tiers;
n = tr_ptrArraySize( &tiers->tiers );
for( i=0; i<n; ++i ) {
tr_tier * tier = tr_ptrArrayNth( (tr_ptrArray*)&tiers->tiers, i );
if( tier->isRunning )
ret = MIN( ret, tier->manualAnnounceAllowedAt );
}
return ret;
}
static void
dbgmsg_tier_announce_queue( const tr_tier * tier )
{
if( tr_deepLoggingIsActive( ) )
{
int i;
char * str;
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 );
}
str = evbuffer_free_to_str( buf );
tr_deepLog( __FILE__, __LINE__, name, "announce queue is %s", str );
tr_free( str );
}
}
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;
int n;
tr_torrent_tiers * tiers;
assert( tr_isTorrent( tor ) );
/* walk through each tier and tell them to announce */
tiers = tor->tiers;
n = tr_ptrArraySize( &tiers->tiers );
for( i=0; i<n; ++i )
{
tr_tier * tier = tr_ptrArrayNth( &tiers->tiers, i );
tier_announce_event_push( tier, 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, n;
tr_torrent_tiers * tiers;
assert( tr_isTorrent( tor ) );
assert( type==TR_ANN_UP || type==TR_ANN_DOWN || type==TR_ANN_CORRUPT );
tiers = tor->tiers;
n = tr_ptrArraySize( &tiers->tiers );
for( i=0; i<n; ++i )
{
tr_tier * tier = tr_ptrArrayNth( &tiers->tiers, i );
tier->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;
}
void
tr_announcerRemoveTorrent( tr_announcer * announcer, tr_torrent * tor )
{
assert( tr_isTorrent( tor ) );
if( tor->tiers )
{
int i;
const int n = tr_ptrArraySize( &tor->tiers->tiers );
for( i=0; i<n; ++i )
{
tr_tier * tier = tr_ptrArrayNth( &tor->tiers->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 );
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;
/** 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 );
tier_announce_event_push( tier, e, tr_time( ) + interval );
}
static void
on_announce_done( tr_session * session,
const tr_announce_response * response,
void * vdata )
{
tr_announcer * announcer = session->announcer;
struct announce_data * data = vdata;
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 )
{
publishError( tier, response->errmsg );
on_announce_error( tier, response->errmsg, event );
}
else
{
int i;
const char * str;
const bool isStopped = event == TR_ANNOUNCE_EVENT_STOPPED;
publishErrorClear( tier );
if(( tracker = tier->currentTracker ))
tracker->consecutiveFailures = 0;
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(( str = response->tracker_id_str ))
{
tr_free( tier->currentTracker->tracker_id_str );
tier->currentTracker->tracker_id_str = tr_strdup( str );
}
tier->currentTracker->seederCount = response->seeders;
tier->currentTracker->leecherCount = response->leechers;
tier->currentTracker->downloadCount = response->downloads;
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;
tier->scrapeAt = now + tier->scrapeIntervalSec;
tier->lastScrapeTime = now;
tier->lastScrapeSucceeded = true;
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_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 );
tr_free( request->tracker_id_str );
tr_free( request->url );
tr_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->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_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 %d seconds.", interval );
tier->lastScrapeSucceeded = false;
tier->scrapeAt = tr_time() + interval;
}
static tr_tier *
find_tier( tr_torrent * tor, const char * url )
{
int i;
const int n = tr_ptrArraySize( &tor->tiers->tiers );
tr_tier ** tiers = (tr_tier**) tr_ptrArrayBase( &tor->tiers->tiers );
for( i=0; i<n; ++i ) {
tr_tracker * tracker = tiers[i]->currentTracker;
if( tracker && !tr_strcmp0( tracker->scrape, url ) )
return tiers[i];
}
return NULL;
}
static void
on_scrape_done( tr_session * session,
const tr_scrape_response * response,
void * user_data UNUSED )
{
int i;
const time_t now = tr_time( );
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( tier, _( "Could not connect to tracker" ) );
}
else if( response->did_timeout )
{
on_scrape_error( tier, _( "Tracker did not respond" ) );
}
else if( response->errmsg )
{
on_scrape_error( tier, response->errmsg );
}
else
{
tr_tracker * tracker;
tier->lastScrapeSucceeded = true;
tier->scrapeIntervalSec = MAX( DEFAULT_SCRAPE_INTERVAL_SEC,
response->min_request_interval );
tier->scrapeAt = now + 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,
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, NULL );
/* 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 ))) {
if( tor->tiers ) {
n = tr_ptrArraySize( &tor->tiers->tiers );
for( i=0; i<n; ++i ) {
tr_tier * tier = tr_ptrArrayNth( &tor->tiers->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 );
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 n;
int out = 0;
int tierCount;
tr_tracker_stat * ret;
const time_t now = tr_time( );
assert( tr_isTorrent( torrent ) );
assert( tr_torrentIsLocked( torrent ) );
/* count the trackers... */
tierCount = tr_ptrArraySize( &torrent->tiers->tiers );
for( i=n=0; i<tierCount; ++i ) {
const tr_tier * tier = tr_ptrArrayNth( &torrent->tiers->tiers, i );
n += tr_ptrArraySize( &tier->trackers );
}
/* alloc the stats */
*setmeTrackerCount = n;
ret = tr_new0( tr_tracker_stat, n );
/* populate the stats */
tierCount = tr_ptrArraySize( &torrent->tiers->tiers );
for( i=0; i<tierCount; ++i )
{
int j;
const tr_tier * tier = tr_ptrArrayNth( &torrent->tiers->tiers, i );
n = tr_ptrArraySize( &tier->trackers );
for( j=0; j<n; ++j )
{
const tr_tracker * tracker = tr_ptrArrayNth( (tr_ptrArray*)&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
trackerItemCopyAttributes( tr_tracker * t, const tr_tracker * o )
{
assert( t != o );
assert( t != NULL );
assert( o != NULL );
t->seederCount = o->seederCount;
t->leecherCount = o->leecherCount;
t->downloadCount = o->downloadCount;
t->downloaderCount = o->downloaderCount;
}
static void
tierCopyAttributes( tr_tier * t, const tr_tier * o )
{
tr_tier bak;
assert( t != NULL );
assert( o != NULL );
assert( t != o );
bak = *t;
*t = *o;
t->tor = bak.tor;
t->trackers = bak.trackers;
t->announce_events = tr_memdup( o->announce_events, sizeof( tr_announce_event ) * o->announce_event_count );
t->announce_event_count = o->announce_event_count;
t->announce_event_alloc = o->announce_event_count;
t->currentTracker = bak.currentTracker;
t->currentTrackerIndex = bak.currentTrackerIndex;
}
void
tr_announcerResetTorrent( tr_announcer * announcer UNUSED, tr_torrent * tor )
{
tr_ptrArray oldTiers = TR_PTR_ARRAY_INIT;
/* if we had tiers already, make a backup of them */
if( tor->tiers != NULL )
{
oldTiers = tor->tiers->tiers;
tor->tiers->tiers = TR_PTR_ARRAY_INIT;
}
/* create the new tier/tracker structs */
addTorrentToTier( tor->tiers, tor );
/* if we had tiers already, merge their state into the new structs */
if( !tr_ptrArrayEmpty( &oldTiers ) )
{
int i, in;
for( i=0, in=tr_ptrArraySize(&oldTiers); i<in; ++i )
{
int j, jn;
const tr_tier * o = tr_ptrArrayNth( &oldTiers, i );
if( o->currentTracker == NULL )
continue;
for( j=0, jn=tr_ptrArraySize(&tor->tiers->tiers); j<jn; ++j )
{
int k, kn;
tr_tier * t = tr_ptrArrayNth(&tor->tiers->tiers,j);
for( k=0, kn=tr_ptrArraySize(&t->trackers); k<kn; ++k )
{
tr_tracker * item = tr_ptrArrayNth(&t->trackers,k);
if( strcmp( o->currentTracker->announce, item->announce ) )
continue;
tierCopyAttributes( t, o );
t->currentTracker = item;
t->currentTrackerIndex = k;
t->wasCopied = true;
trackerItemCopyAttributes( item, o->currentTracker );
dbgmsg( t, "attributes copied to tier %d, tracker %d"
"from tier %d, tracker %d",
i, o->currentTrackerIndex, j, k );
}
}
}
}
/* kickstart any tiers that didn't get started */
if( tor->isRunning )
{
int i, n;
const time_t now = tr_time( );
tr_tier ** tiers = (tr_tier**) tr_ptrArrayPeek( &tor->tiers->tiers, &n );
for( i=0; i<n; ++i ) {
tr_tier * tier = tiers[i];
if( !tier->wasCopied )
tier_announce_event_push( tier, TR_ANNOUNCE_EVENT_STARTED, now );
}
}
/* cleanup */
tr_ptrArrayDestruct( &oldTiers, tierFree );
}
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