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/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever.
$id$ */
/* System */
#include <pthread.h>
#include <unistd.h>
#include <string.h>
/* Libowfat */
#include "io.h"
/* Opentracker */
#include "trackerlogic.h"
#include "ot_mutex.h"
#include "ot_vector.h"
#include "ot_clean.h"
#include "ot_stats.h"
/* Returns amount of removed peers */
static ssize_t clean_single_bucket( ot_peer *peers, size_t peer_count, time_t timedout, int *removed_seeders ) {
ot_peer *last_peer = peers + peer_count, *insert_point;
time_t timediff;
/* Two scan modes: unless there is one peer removed, just increase ot_peertime */
while( peers < last_peer ) {
if( ( timediff = timedout + OT_PEERTIME( peers ) ) >= OT_PEER_TIMEOUT )
break;
OT_PEERTIME( peers++ ) = timediff;
}
/* If we at least remove one peer, we have to copy */
insert_point = peers;
while( peers < last_peer )
if( ( timediff = timedout + OT_PEERTIME( peers ) ) < OT_PEER_TIMEOUT ) {
OT_PEERTIME( peers ) = timediff;
memcpy( insert_point++, peers++, sizeof(ot_peer));
} else
if( OT_PEERFLAG( peers++ ) & PEER_FLAG_SEEDING )
(*removed_seeders)++;
return peers - insert_point;
}
/* Clean a single torrent
return 1 if torrent timed out
*/
int clean_single_torrent( ot_torrent *torrent ) {
ot_peerlist *peer_list = torrent->peer_list;
ot_vector *bucket_list = &peer_list->peers;
time_t timedout = (time_t)( g_now_minutes - peer_list->base );
int num_buckets = 1, removed_seeders = 0;
/* No need to clean empty torrent */
if( !timedout )
return 0;
/* Torrent has idled out */
if( timedout > OT_TORRENT_TIMEOUT )
return 1;
/* Nothing to be cleaned here? Test if torrent is worth keeping */
if( timedout > OT_PEER_TIMEOUT ) {
if( !peer_list->peer_count )
return peer_list->down_count ? 0 : 1;
timedout = OT_PEER_TIMEOUT;
}
if( OT_PEERLIST_HASBUCKETS( peer_list ) ) {
num_buckets = bucket_list->size;
bucket_list = (ot_vector *)bucket_list->data;
}
while( num_buckets-- ) {
size_t removed_peers = clean_single_bucket( bucket_list->data, bucket_list->size, timedout, &removed_seeders );
peer_list->peer_count -= removed_peers;
bucket_list->size -= removed_peers;
if( bucket_list->size < removed_peers )
vector_fixup_peers( bucket_list );
++bucket_list;
}
peer_list->seed_count -= removed_seeders;
/* See, if we need to convert a torrent from simple vector to bucket list */
if( ( peer_list->peer_count > OT_PEER_BUCKET_MINCOUNT ) || OT_PEERLIST_HASBUCKETS(peer_list) )
vector_redistribute_buckets( peer_list );
if( peer_list->peer_count )
peer_list->base = g_now_minutes;
else {
/* When we got here, the last time that torrent
has been touched is OT_PEER_TIMEOUT Minutes before */
peer_list->base = g_now_minutes - OT_PEER_TIMEOUT;
}
return 0;
}
/* Clean up all peers in current bucket, remove timedout pools and
torrents */
static void * clean_worker( void * args ) {
(void) args;
while( 1 ) {
int bucket = OT_BUCKET_COUNT;
while( bucket-- ) {
ot_vector *torrents_list = mutex_bucket_lock( bucket );
size_t toffs;
int delta_torrentcount = 0;
for( toffs=0; toffs<torrents_list->size; ++toffs ) {
ot_torrent *torrent = ((ot_torrent*)(torrents_list->data)) + toffs;
if( clean_single_torrent( torrent ) ) {
vector_remove_torrent( torrents_list, torrent );
--delta_torrentcount;
--toffs;
}
}
mutex_bucket_unlock( bucket, delta_torrentcount );
if( !g_opentracker_running )
return NULL;
usleep( OT_CLEAN_SLEEP );
}
stats_cleanup();
}
return NULL;
}
static pthread_t thread_id;
void clean_init( void ) {
pthread_create( &thread_id, NULL, clean_worker, NULL );
}
void clean_deinit( void ) {
pthread_cancel( thread_id );
}
const char *g_version_clean_c = "$Source$: $Revision$\n";
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