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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 <errno.h>
#include <pthread.h>
#include <string.h>
#include <unistd.h>
/* Opentracker */
#include "ot_accesslist.h"
#include "ot_clean.h"
#include "ot_mutex.h"
#include "ot_stats.h"
#include "ot_vector.h"
#include "trackerlogic.h"
/* Returns amount of removed peers */
static ssize_t clean_single_bucket(ot_peer *peers, size_t peer_count, size_t peer_size, time_t timedout, size_t *removed_seeders) {
ot_peer *last_peer = peers + peer_count * peer_size, *insert_point;
/* Two scan modes: unless there is one peer removed, just increase ot_peertime */
while (peers < last_peer) {
time_t timediff = timedout + OT_PEERTIME(peers, peer_size);
if (timediff >= OT_PEER_TIMEOUT)
break;
OT_PEERTIME(peers, peer_size) = timediff;
peers += peer_size;
}
/* If we at least remove one peer, we have to copy */
for (insert_point = peers; peers < last_peer; peers += peer_size) {
time_t timediff = timedout + OT_PEERTIME(peers, peer_size);
if (timediff < OT_PEER_TIMEOUT) {
OT_PEERTIME(peers, peer_size) = timediff;
memcpy(insert_point, peers, peer_size);
insert_point += peer_size;
} else if (OT_PEERFLAG_D(peers, peer_size) & PEER_FLAG_SEEDING)
(*removed_seeders)++;
}
return (peers - insert_point) / peer_size;
}
int clean_single_peer_list(ot_peerlist *peer_list, size_t peer_size) {
ot_vector *peer_vector = &peer_list->peers;
time_t timedout = (time_t)(time_now_minutes() - peer_list->base);
size_t 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 = peer_vector->size;
peer_vector = (ot_vector *)peer_vector->data;
}
while (num_buckets--) {
size_t removed_peers = clean_single_bucket(peer_vector->data, peer_vector->size, peer_size, timedout, &removed_seeders);
peer_list->peer_count -= removed_peers;
peer_vector->size -= removed_peers;
if (removed_peers)
vector_fixup_peers(peer_vector, peer_size);
/* Skip to next bucket, a vector containing peers */
++peer_vector;
}
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, peer_size);
if (peer_list->peer_count)
peer_list->base = time_now_minutes();
else {
/* When we got here, the last time that torrent
has been touched is OT_PEER_TIMEOUT Minutes before */
peer_list->base = time_now_minutes() - OT_PEER_TIMEOUT;
}
return 0;
}
/* Clean a single torrent
return 1 if torrent timed out
*/
int clean_single_torrent(ot_torrent *torrent) {
return clean_single_peer_list(torrent->peer_list6, OT_PEER_SIZE6) * clean_single_peer_list(torrent->peer_list4, OT_PEER_SIZE4);
}
static pthread_mutex_t g_clean_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t g_clean_wakeup = PTHREAD_COND_INITIALIZER;
static void clean_sleep(void) {
struct timespec deadline;
clock_gettime(CLOCK_REALTIME, &deadline);
deadline.tv_sec += OT_CLEAN_SLEEP / 1000000;
deadline.tv_nsec += (OT_CLEAN_SLEEP % 1000000) * 1000;
if (deadline.tv_nsec >= 1000000000) {
++deadline.tv_sec;
deadline.tv_nsec -= 1000000000;
}
/* Both sides hold the mutex, so the flag cannot be cleared and signalled
in the window between testing it and waiting on it */
pthread_mutex_lock(&g_clean_mutex);
while (g_opentracker_running)
if (pthread_cond_timedwait(&g_clean_wakeup, &g_clean_mutex, &deadline) == ETIMEDOUT)
break;
pthread_mutex_unlock(&g_clean_mutex);
}
/* Clean up all peers in current bucket, remove timedout pools and
torrents */
static void *clean_worker(void *args) {
(void)args;
while (1) {
size_t 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;
clean_sleep();
}
stats_cleanup();
#ifdef WANT_ACCESSLIST
accesslist_cleanup();
#endif
}
return NULL;
}
static pthread_t thread_id;
void clean_init(void) { pthread_create(&thread_id, NULL, clean_worker, NULL); }
void clean_deinit(void) {
pthread_mutex_lock(&g_clean_mutex);
pthread_cond_signal(&g_clean_wakeup);
pthread_mutex_unlock(&g_clean_mutex);
pthread_join(thread_id, NULL);
}
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