WIP: start work on http tracker

aquatic_http/src/lib/tasks.rs

@@ -0,0 +1,28 @@
+use std::time::Instant;
+
+use crate::common::*;
+
+
+// identical to ws version
+pub fn clean_torrents(state: &State){
+    fn clean_torrent_map(
+        torrent_map: &mut TorrentMap,
+    ){
+        let now = Instant::now();
+
+        torrent_map.retain(|_, torrent_data| {
+            torrent_data.peers.retain(|_, peer| {
+                peer.valid_until.0 >= now
+            });
+
+            !torrent_data.peers.is_empty()
+        });
+
+        torrent_map.shrink_to_fit();
+    }
+
+    let mut torrent_maps = state.torrent_maps.lock();
+
+    clean_torrent_map(&mut torrent_maps.ipv4);
+    clean_torrent_map(&mut torrent_maps.ipv6);
+}