From 8900cc0dd980cb08a0af957a1d0dd849bf3c2ac6 Mon Sep 17 00:00:00 2001
From: erdgeist <>
Date: Tue, 6 Nov 2007 11:58:32 +0000
Subject: No one can get access to buckets now without locking them. Also split
 up the trackerlogic.c-monster in functional sub-units. HEADS UP: this code is
 untested and not considered stable.

---
 ot_clean.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 ot_clean.c

(limited to 'ot_clean.c')

diff --git a/ot_clean.c b/ot_clean.c
new file mode 100644
index 0000000..46b3e0c
--- /dev/null
+++ b/ot_clean.c
@@ -0,0 +1,119 @@
+/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
+   It is considered beerware. Prost. Skol. Cheers or whatever. */
+
+/* System */
+#include <stdlib.h>
+#include <string.h>
+
+/* Libowfat */
+#include "byte.h"
+
+/* Opentracker */
+#include "trackerlogic.h"
+#include "ot_mutex.h"
+
+/* To remember, when we last cleaned up */
+static ot_time   all_torrents_clean[OT_BUCKET_COUNT];
+
+/* Clean a single torrent
+   return 1 if torrent timed out
+*/
+int clean_single_torrent( ot_torrent *torrent ) {
+  ot_peerlist *peer_list = torrent->peer_list;
+  size_t peers_count = 0, seeds_count;
+  time_t timedout = (int)( NOW - peer_list->base );
+  int i;
+#ifdef WANT_TRACKER_SYNC
+  char *new_peers;
+#endif
+
+  /* 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_POOLS_COUNT ) {
+    if( !peer_list->peer_count )
+      return peer_list->down_count ? 0 : 1;
+    timedout = OT_POOLS_COUNT;
+  }
+
+  /* Release vectors that have timed out */
+  for( i = OT_POOLS_COUNT - timedout; i < OT_POOLS_COUNT; ++i )
+    free( peer_list->peers[i].data);
+
+  /* Shift vectors back by the amount of pools that were shifted out */
+  memmove( peer_list->peers + timedout, peer_list->peers, sizeof( ot_vector ) * ( OT_POOLS_COUNT - timedout ) );
+  byte_zero( peer_list->peers, sizeof( ot_vector ) * timedout );
+
+  /* Shift back seed counts as well */
+  memmove( peer_list->seed_counts + timedout, peer_list->seed_counts, sizeof( size_t ) * ( OT_POOLS_COUNT - timedout ) );
+  byte_zero( peer_list->seed_counts, sizeof( size_t ) * timedout );
+
+#ifdef WANT_TRACKER_SYNC
+  /* Save the block modified within last OT_POOLS_TIMEOUT */
+  if( peer_list->peers[1].size &&
+    ( new_peers = realloc( peer_list->changeset.data, sizeof( ot_peer ) * peer_list->peers[1].size ) ) )
+  {
+    memmove( new_peers, peer_list->peers[1].data, peer_list->peers[1].size );
+    peer_list->changeset.data = new_peers;
+    peer_list->changeset.size = sizeof( ot_peer ) * peer_list->peers[1].size;
+  } else {
+    free( peer_list->changeset.data );
+
+    memset( &peer_list->changeset, 0, sizeof( ot_vector ) );
+  }
+#endif
+
+  peers_count = seeds_count = 0;
+  for( i = 0; i < OT_POOLS_COUNT; ++i ) {
+    peers_count += peer_list->peers[i].size;
+    seeds_count += peer_list->seed_counts[i];
+  }
+  peer_list->seed_count = seeds_count;
+  peer_list->peer_count = peers_count;
+
+  if( peers_count )
+    peer_list->base = NOW;
+  else {
+    /* When we got here, the last time that torrent
+       has been touched is OT_POOLS_COUNT units before */
+    peer_list->base = NOW - OT_POOLS_COUNT;
+  }
+  return 0;
+}
+
+/* Clean up all peers in current bucket, remove timedout pools and
+   torrents */
+void clean_all_torrents( void ) {
+  ot_vector         *torrents_list;
+  size_t             i;
+  static int         bucket;
+  ot_time time_now = NOW;
+
+  /* Search for an uncleaned bucked */
+  while( ( all_torrents_clean[bucket] == time_now ) && ( ++bucket < OT_BUCKET_COUNT ) );
+  if( bucket >= OT_BUCKET_COUNT ) {
+    bucket = 0; return;
+  }
+
+  all_torrents_clean[bucket] = time_now;
+
+  torrents_list = mutex_bucket_lock( bucket );
+  for( i=0; i<torrents_list->size; ++i ) {
+    ot_torrent *torrent = ((ot_torrent*)(torrents_list->data)) + i;
+    if( clean_single_torrent( torrent ) ) {
+      vector_remove_torrent( torrents_list, torrent );
+      --i; continue;
+    }
+  }
+  mutex_bucket_unlock( bucket );
+}
+
+void clean_init( void ) {
+  byte_zero( all_torrents_clean, sizeof( all_torrents_clean ) );
+}
+
+void clean_deinit( void ) {
+  byte_zero( all_torrents_clean, sizeof( all_torrents_clean ) );
+}
\ No newline at end of file
-- 
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