From 1e7248b330bde4c70528ccf91535391e19294dc3 Mon Sep 17 00:00:00 2001
From: Dirk Engling <erdgeist@erdgeist.org>
Date: Sat, 7 Nov 2026 16:54:36 +0100
Subject: Add a knob to help reducing memory consumption. This time: empty
 torrents may expire sooner

---
 src/ot_clean.c     | 4 +++-
 src/ot_config.c    | 7 +++++++
 src/trackerlogic.h | 5 +++++
 3 files changed, 15 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/ot_clean.c b/src/ot_clean.c
index 77cb4ba..9e2186f 100644
--- a/src/ot_clean.c
+++ b/src/ot_clean.c
@@ -16,6 +16,8 @@
 #include "ot_vector.h"
 #include "trackerlogic.h"
 
+ot_time g_empty_torrent_timeout = OT_TORRENT_TIMEOUT;
+
 /* 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, *insert_point;
@@ -106,7 +108,7 @@ int clean_single_torrent(ot_torrent *torrent) {
   /* Already empty and nothing arrived before the peer timeout: keep it only
      while a down count is worth remembering */
   if (timedout > OT_PEER_TIMEOUT && !torrent->peer_list6 && !torrent->peer_list4)
-    return torrent->down_count ? 0 : 1;
+    return (torrent->down_count && timedout <= g_empty_torrent_timeout) ? 0 : 1;
 
   /* Peers past the peer timeout are gone regardless, which caps how far the
      lists are aged in this pass */
diff --git a/src/ot_config.c b/src/ot_config.c
index 9c5e8f0..8af6cfc 100644
--- a/src/ot_config.c
+++ b/src/ot_config.c
@@ -192,6 +192,7 @@ typedef enum {
     CONFIG_UNKNOWN,
     CONFIG_TRACKER_ROOTDIR,
     CONFIG_TRACKER_USER,
+    CONFIG_TRACKER_EMPTY_TIMEOUT,
     CONFIG_LISTEN_TCP_UDP,
     CONFIG_LISTEN_TCP,
     CONFIG_LISTEN_UDP,
@@ -223,6 +224,7 @@ typedef struct {
 static const config_key config_keys[] = {
     CONFIG_KEY("tracker.rootdir",          CONFIG_TRACKER_ROOTDIR),
     CONFIG_KEY("tracker.user",             CONFIG_TRACKER_USER),
+    CONFIG_KEY("tracker.empty_torrent_timeout", CONFIG_TRACKER_EMPTY_TIMEOUT),
     CONFIG_KEY("listen.tcp_udp",           CONFIG_LISTEN_TCP_UDP),
     CONFIG_KEY("listen.tcp",               CONFIG_LISTEN_TCP),
     CONFIG_KEY("listen.udp",               CONFIG_LISTEN_UDP),
@@ -316,6 +318,11 @@ static int parse_configfile(char *config_filename) {
       case CONFIG_TRACKER_USER:
         set_config_option(&g_serveruser, p);
         break;
+      case CONFIG_TRACKER_EMPTY_TIMEOUT:
+        if (!scan_uint(p, &value, UINT_MAX))
+          goto parse_error;
+        g_empty_torrent_timeout = (ot_time)value;
+        break;
       case CONFIG_LISTEN_TCP_UDP:
       case CONFIG_LISTEN_TCP:
       case CONFIG_LISTEN_UDP: {
diff --git a/src/trackerlogic.h b/src/trackerlogic.h
index 6b53406..c4b7774 100644
--- a/src/trackerlogic.h
+++ b/src/trackerlogic.h
@@ -44,6 +44,11 @@ typedef struct {
 #define OT_TORRENT_TIMEOUT_HOURS        24
 #define OT_TORRENT_TIMEOUT              (60 * OT_TORRENT_TIMEOUT_HOURS)
 
+/* How long a torrent kept only for its download count, with no peers in either
+   family, is held, in minutes. Defaults to OT_TORRENT_TIMEOUT and is lowered by
+   tracker.empty_torrent_timeout. */
+extern ot_time g_empty_torrent_timeout;
+
 #define OT_CLIENT_REQUEST_INTERVAL_RANDOM                                                                                                                      \
   (OT_CLIENT_REQUEST_INTERVAL - OT_CLIENT_REQUEST_VARIATION / 2 + (int)(nrand48(ws->rand48_state) % OT_CLIENT_REQUEST_VARIATION))
 #define OT_CLIENT_REJECT_INTERVAL_RANDOM                                                                                                                       \
-- 
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